Alpha Trading Glossary · Alpha Academy

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This is the Alpha Academy dictionary — every important market word, defined in the plainest English we could write, for students who started from zero. It holds over 500 terms covering stocks, options, futures, funds, forex, crypto, risk, rules, and the everyday language traders actually use.

How to Search This Glossary

This glossary is fully searchable. Open the PDF on any device and use the find feature — on a computer press Ctrl+F (Windows) or Cmd+F (Mac), type the word you are looking for, and jump straight to it. On a phone or tablet, open the PDF and use the search or find-in-page option in your PDF app. Terms are also organized A–Z, so you can browse by letter.

A

Account — The place at a brokerage firm where your money and investments are held. You deposit cash into it, and all your buying and selling happens through it.
Accredited Investor — A person the government allows to buy certain riskier, private investments because they meet income or wealth requirements set by regulators. Most everyday stocks and funds are open to everyone, accredited or not.
Acquisition — When one company buys another company. Example: if a giant company buys a small one, the small company's stock usually stops trading on its own.
Actively Managed Fund — A pooled investment where a professional manager hand-picks what to buy and sell, trying to beat the overall market. These usually charge higher fees than funds that simply copy an index.
Adjusted Close — A stock's closing price after it has been corrected for things like dividends and stock splits. It gives a truer picture of the stock's real return over time.
After-Hours Trading — Buying and selling stocks outside the regular market session of 9:30 AM to 4:00 PM Eastern Time. Prices can move more wildly then because fewer people are trading.
Algorithm — A set of step-by-step rules a computer follows to make decisions, such as when to buy or sell. Many large firms use algorithms to place trades automatically in a fraction of a second.
All-or-None Order — An order to buy or sell that must be filled completely, in full, or not at all. If the full amount is not available, the trade simply does not happen.
Alpha — A measure of how much an investment beat a comparison index, such as the S&P 500. If a fund returned 12% and its index returned 10%, the extra 2% is its alpha.
American Depositary Receipt (ADR) — A certificate traded on a US exchange that represents shares of a foreign company. It lets Americans invest in overseas companies without opening a foreign account.
American-Style Option — An option contract the owner can use (exercise) at any time before it expires, not just on the last day. Most options on individual US stocks work this way.

Analyst — A professional who studies companies, their finances, and their industries, then publishes opinions on whether a stock looks attractive. Their views are opinions, not guarantees.
Annual Meeting — A yearly gathering where a company's leaders report to shareholders and shareholders vote on things like board members. Public companies are required to hold one.
Annual Report — A detailed yearly document a company publishes about its business and finances, including its audited financial statements. The official version filed with regulators is called a 10-K.
Annuity — A contract, usually sold by an insurance company, that pays you a series of payments over time in exchange for money you pay in. People often use annuities for retirement income.
Appreciation — An increase in the value of an investment. If you buy a stock at $40 and it rises to $55, that $15 rise is appreciation.
Arbitrage — Buying something in one place and selling it at the same moment in another place for a slightly higher price, pocketing the tiny difference. Computers do most of this now because the gaps last only instants.
Ask — Short for ask price: the lowest price a seller is currently willing to accept for a stock or contract. It is the price you will usually pay when you buy right away.
Ask Price — The lowest price any seller is offering at this moment. Example: if the ask price is $50.05, that is the cheapest you can buy a share for right now.
Ask Size — The number of shares or contracts sellers are offering at the ask price. It shows how much is available to buy at that cheapest offered price.
Asset — Anything of value that you own, such as cash, a house, or shares of stock. In trading, your assets are the money and investments in your account.
Asset Allocation — How you divide your money among different kinds of investments, like stocks, bonds, and cash. Example: 70% stocks and 30% bonds is one simple allocation.
Asset Class — A group of similar investments, such as stocks, bonds, real estate, or commodities like gold and oil. Different classes tend to behave differently in the same economy.
Assignment — When the seller of an option is chosen to fulfill the contract — for example, being required to sell 100 shares at the agreed price because the buyer used their option. Sellers cannot control when this happens.
At-the-Close Order — An order that is carried out as close as possible to the market's closing price at the end of the day. Traders use it when they want the day's final price.
At-the-Money — Describes an option whose strike price (the set price in the contract) is equal, or very close, to the current price of the stock. A $50 call option on a $50 stock is at-the-money.
At-the-Open Order — An order that is carried out as close as possible to the market's opening price at the start of the day. If it cannot be filled at the open, it is usually cancelled.
Automatic Exercise — At expiration, an option that is in-the-money (worth using) by even a small amount is usually exercised automatically by the clearing system unless you instruct otherwise. Check your broker's exact rule so you are never surprised.
Average Daily Volume — The average number of shares of a stock that change hands on a typical trading day. High volume means lots of people are trading it, so buying and selling is usually easier.
Average True Range — A measuring tool (often shortened to ATR) that shows how much a stock's price typically moves in a day, including gaps. Traders use it to judge how jumpy a stock is and where to place stop losses.
Averaging Down — Buying more shares of something after its price has fallen, which lowers your average cost per share. It can help if the price recovers, but it also puts more money into a losing position, so it is risky.
Averaging Up — Buying more shares of something after its price has risen, which raises your average cost per share. Traders do this when a winning position keeps proving itself.

B

Backtesting — Testing a trading strategy on old price data to see how it would have performed in the past. Good past results do not guarantee future profits.
Balance Sheet — A financial snapshot of a company at one moment, listing what it owns (assets), what it owes (liabilities), and what is left over for owners. It answers the question: what is this company worth on paper right now?
Bar Chart — A type of price chart where each bar shows a period's opening price, highest price, lowest price, and closing price. It packs the same information as a candlestick into simple lines.
Basis Point — One one-hundredth of a percent, written as 0.01%. If the Federal Reserve raises rates by 25 basis points, that means a 0.25% increase.
Bear Call Spread — An options strategy using two call contracts: you sell one call and buy a higher-priced call for protection, collecting money up front. It profits if the stock stays flat or falls, and both profit and loss are capped.
Bear Market — A long period when the overall market has fallen 20% or more from a recent high. Bear markets are painful but a normal part of investing history.
Bear Put Spread — An options strategy using two put contracts: you buy one put and sell a lower-priced put to reduce the cost. It profits if the stock falls, and both profit and loss are capped.
Bearish — Believing a price will go down. A bearish trader expects falling prices, just as a bear swipes its paws downward.
Benchmark — A standard used to compare performance against, usually an index like the S&P 500. If your account grew faster than your benchmark, you beat the market; slower, and you lagged it.
Beta — A number that measures how much a stock tends to swing compared with the overall market. A beta of 1 moves about with the market, 2 means roughly double the swings, and 0.5 means about half.
Bid — Short for bid price: the highest price a buyer is currently willing to pay for a stock or contract. It is the price you will usually get when you sell right away.
Bid-Ask Spread — The gap between the bid price (what buyers offer) and the ask price (what sellers want). A wider gap means trading costs you more, because you buy at the higher price and sell at the lower one.
Bid Price — The highest price any buyer is offering at this moment. Example: if the bid price is $50.00, that is the most you can sell a share for right now.
Bid Size — The number of shares or contracts buyers want to purchase at the bid price. It shows how much demand is waiting at that highest offered price.
Block Trade — A single very large trade, usually at least 10,000 shares, often made by a big institution rather than an individual. Block trades are often arranged privately to avoid disturbing the market price.

Blue-Chip Stock — A share of a large, well-known, financially strong company with a long history, like the biggest household-name businesses. Blue chips are considered steadier than most stocks, though they can still fall.
Bollinger Bands — Lines drawn on a chart above and below a moving average, usually set two standard deviations (a measure of spread) away. The bands widen when a stock moves wildly and squeeze tight when it is calm, helping traders spot unusual moves.
Bond — A loan you make to a company or government: you hand over money, they pay you interest on a schedule, and they promise to return your money on a set date. Bonds are generally calmer than stocks but usually grow more slowly.
Bond Yield — The return a bond pays, expressed as a percentage of its price. When a bond's price falls, its yield rises, and when its price rises, its yield falls.
Book Value — What a company would be worth on paper if it sold everything it owns and paid off everything it owes. Book value per share divides that number by the number of shares.
Bracket Order — An order that bundles three instructions: buy (or sell), plus a profit-taking price and a stop-loss price attached. Whichever exit price is hit first closes the trade automatically.
Break-Even Point — The price at which a trade makes no profit and no loss. For a bought call option, it is the strike price plus the premium paid; for a bought put, it is the strike price minus the premium.
Breakout — When a price pushes through a level where it kept stopping and turning around before, often with heavy trading. Traders watch breakouts because a strong move sometimes follows.
Broker — A licensed company (or its representative) that carries out buy and sell orders for customers in exchange for fees. Your brokerage account is held with a broker.
Bull Call Spread — An options strategy using two call contracts: you buy one call and sell a higher-priced call to lower the cost. It profits if the stock rises, and both profit and loss are capped.
Bull Market — A long period when the overall market has risen 20% or more from a recent low. Bull markets reward patience but eventually always end.
Bull Put Spread — An options strategy using two put contracts: you sell one put and buy a lower-priced put for protection, collecting money up front. It profits if the stock stays flat or rises, and both profit and loss are capped.
Bullish — Believing a price will go up. A bullish trader expects rising prices, just as a bull thrusts its horns upward.
Business Cycle — The repeating pattern of the economy growing for a while, then slowing or shrinking, then recovering. Different kinds of companies tend to do well at different stages of the cycle.
Buy and Hold — A strategy of buying an investment and keeping it for years through ups and downs, rather than trading in and out. It is the approach most long-term investors use.
Buy to Close — An order that closes a position you previously sold short, by buying back the same stock or option contract. After it fills, that short position is gone.
Buy to Open — An order that starts a brand-new long position, such as buying an option contract you did not own before. It is the first half of a trade; buy to close or sell to close ends it.
Buyback — When a company purchases its own shares back from the market, reducing the number of shares in public hands. Fewer shares can make each remaining share represent a bigger slice of the company.

C

Call Option — A contract giving you the right, but not the duty, to buy 100 shares of a stock at a set price (the strike price) any time before a set date. You pay a premium for this right, and that premium is the most you can lose.
Candlestick — A chart shape that shows a period's opening price, closing price, and the high and low in between, using a thick body and thin wicks. Green usually means the price rose during the period; red means it fell.
Capital — The money and assets you have available to invest or run a business. In trading, your capital is the cash you could put at risk.
Capital Gain — The profit you make when you sell an investment for more than you paid for it. Example: buy at $50, sell at $70, and your capital gain is $20 per share.
Capital Gains Tax — The tax you may owe on a capital gain after you sell. Investments held over a year usually get a lower tax rate than ones held a year or less; this is educational only, not tax advice — talk to a tax professional.
Capital Loss — The loss you take when you sell an investment for less than you paid for it. Example: buy at $70, sell at $50, and your capital loss is $20 per share.
Capitalization — Also called market cap: the total value of a company in the stock market, found by multiplying the share price by the number of shares. A $100 stock with 1 billion shares has a capitalization of $100 billion.
Cash Account — A brokerage account where you can only trade with money you have actually deposited and settled — no borrowing. It is the simplest and safest account type for beginners.
Cash Flow — The movement of money into and out of a business or account over a period. A company with strong positive cash flow takes in more cash than it spends.
Cash Settlement — When a contract is settled by paying the cash difference in value instead of delivering the actual item, like shares or barrels of oil. Index options such as SPX settle this way.
Catalyst — A news event or announcement that pushes a stock's price to move, such as an earnings report, a new product, or a government decision. Traders watch calendars to know when catalysts are coming.
Chart — A picture of how a price has moved over time. Charts are the main tool traders use to study past price behavior and plan trades.
Chart Pattern — A recognizable shape that prices sometimes form on a chart, like a triangle or a double top, which traders watch for clues about what might happen next. Patterns are tendencies, not promises.
Circuit Breaker — A pre-set rule that temporarily pauses trading across the market after a very sharp fall, giving everyone time to calm down and absorb news. Individual stocks have similar pause rules for extreme moves.
Clearing House — A neutral middleman organization that stands between buyers and sellers to make sure every trade is completed and paid as promised. It greatly reduces the risk that one side fails to deliver.
Closing Bell — The bell rung at 4:00 PM Eastern Time that signals the end of the regular trading day on the New York Stock Exchange. After it, regular trading hours are over.

Closing Price — The final price at which a stock or contract traded during a regular trading session. It is the price most often quoted in news reports about the day.
Collar — An options strategy where you own a stock, buy a protective put (insurance against a fall), and pay for it by selling a call that caps your upside. It limits both your possible loss and your possible gain.
Commission — A fee a broker charges for executing a trade. Many US brokers now charge zero commission on stock trades but still charge a per-contract fee on options — check your broker for the current number.
Commodity — A basic raw product that is the same no matter who produces it, like oil, gold, wheat, or coffee. Commodities are traded heavily with futures contracts.
Common Stock — The standard ownership shares of a company that most people buy, usually carrying voting rights on company matters. If a company fails, common stockholders are paid last, after lenders and bondholders.
Compound Interest — Earning interest not only on your original money but also on the interest it has already earned, so growth snowballs over time. Starting early matters more than starting big.
Consolidation — A period when a price moves sideways within a fairly tight range after a bigger move, as buyers and sellers take a breather. Traders watch for the price to break out of the range.
Consumer Price Index (CPI) — A government report measuring how much everyday goods and services cost compared with before — the most watched measure of inflation. CPI releases often move the whole market because they influence interest-rate decisions.
Contango — When futures contracts for later months cost more than contracts for nearer months, which is the normal pattern for many commodities. It reflects costs like storage and insurance over time.
Contract — A standardized legal agreement traded on an exchange, such as an option or futures contract, that spells out exactly what is being bought or sold, how much, and by when. One standard stock option contract covers 100 shares.
Contract Month — The month in which a futures contract expires and must be settled or rolled into a later month. Traders name futures by their contract month, like the December crude oil contract.
Contrarian — An investor who deliberately goes against the crowd — buying when most people are fearful and prices are beaten down, or pulling back when everyone is euphoric. It sounds simple but is emotionally very hard.
Correction — A market or stock decline of 10% or more from a recent high, but less than the 20% that defines a bear market. Corrections are common and usually healthy, even though they feel scary.
Cost Basis — The total original cost of an investment, including the purchase price and fees, used to figure out your profit or loss and your taxes. If you paid $500 for shares plus a $5 fee, your cost basis is $505.
Coupon — The regular interest payment a bond makes to its owner, usually expressed as a yearly percentage of the bond's face value. A $1,000 bond with a 5% coupon pays $50 a year.
Covered Call — Selling a call option on a stock you already own at least 100 shares of, collecting the premium as income. Your shares cover the obligation if the buyer exercises, but your upside is capped at the strike price.
Credit Spread — An options strategy where you sell one option and buy another of the same type further from the money, receiving more premium than you pay. Your maximum loss is capped at the gap between the two strike prices minus the credit you received.

Currency — The money of a country, such as US dollars, euros, or Japanese yen. Currencies are traded in pairs, betting that one will strengthen against the other.
Current Ratio — A quick health check for a company: its current assets (things convertible to cash within a year) divided by its current liabilities (bills due within a year). A ratio above 1 means it can cover its near-term bills on paper.
Cyclical Stock — A stock whose business rises and falls with the economy, like airlines, car makers, and hotel chains. These companies earn the most when times are good and suffer first when times turn bad.

D

Dark pool — A private trading venue where big investors buy and sell away from the public exchanges, so their large orders do not move the price before they finish. Regular investors buy and sell on public exchanges instead.
Day order — An order to buy or sell that cancels automatically if it has not filled by the end of that trading day. If you place a day order at 10 AM and it never executes, it is gone at the 4 PM close.
Day trade — Buying and selling the same stock or option on the same day, opening and closing the position before the market closes. Buying shares at 10 AM and selling them at 2 PM is one day trade.
Day trader — Someone who makes day trades often, trying to profit from small price moves within a single day. Brokers flag very frequent day traders in margin accounts, and special equity rules can apply — the classic rule required $25,000 in the account, regulators have been replacing it with intraday-margin standards, so check your own broker's current rule.
Dead cat bounce — A small, brief price rise in the middle of a bigger fall, after which the price keeps dropping. It tricks some buyers into thinking the worst is over when it is not.
Debit — Money you pay out to open a trade. If an option spread costs you $200 to open, that $200 is a debit.
Debit spread — An options trade with two parts (one bought, one sold) that you pay money to open. For a basic debit spread, the most you can lose is the amount you paid, and the most you can gain is the spread's width minus what you paid.
Debt — Money that is owed. A company with debt has borrowed money it must pay back, the same way a person owes money on a loan.
Deep in the money — Describes an option that already has a lot of built-in value because the stock price is far past the strike price. Example: a call with a $50 strike price while the stock trades at $70 is deep in the money.
Deflation — The opposite of inflation: prices in general slowly falling over time, so a dollar buys more later than it does today. It sounds nice but can signal a weak economy.
Delisting — When a stock is removed from an exchange, usually because the company broke the exchange's rules or its price fell too low for too long. After delisting, the stock becomes much harder to buy and sell.
Delivery — In futures, the moment the actual goods behind a contract (like oil or gold) are due to change hands. Most traders close or roll their futures contracts before delivery so they never deal with real barrels or bars.
Delta — An options number that estimates how much an option's price will move if the stock moves $1. A delta of 0.40 means the option gains roughly $0.40 if the stock rises $1, and loses roughly $0.40 if the stock falls $1.
Demand — How much of something buyers want at a given price. When demand is high and supply is limited, prices tend to rise.
Derivative — A contract whose value comes from something else, like a stock, an index, or a commodity. Options and futures are derivatives — they have no value on their own, only through the thing they are based on.
Dip — A small, short-term drop in a price. "Buying the dip" means buying after that small drop, hoping the price climbs back.

Diversification — Spreading your money across different investments instead of putting it all in one. If you own 20 different stocks and one crashes, the other 19 soften the blow.
Dividend — A cash payment a company sends its shareholders — like a small thank-you check for owning the stock. Not every company pays one, and dividends are never guaranteed.
Dividend yield — A simple way to compare dividends: the yearly dividend divided by the stock price, shown as a percent. A stock at $50 paying $2 a year in dividends has a dividend yield of 4%.
Doji — A single candlestick on a chart where the price opened and closed at almost the same place, leaving a very small body with wicks sticking out. It suggests buyers and sellers are evenly matched and undecided.
Dollar-cost averaging — Investing the same amount of money on a regular schedule, no matter the price — for example, $100 into an index fund every payday. You automatically buy more shares when prices are low and fewer when prices are high.
Double bottom — A chart pattern shaped like a W, where price fell to a low, bounced, and fell to about the same low again before rising. Some traders read it as a possible sign a downtrend is ending, but it is never a guarantee.
Double top — A chart pattern shaped like an M, where price rose to a high, pulled back, and rose to about the same high again before falling. Some traders read it as a possible sign an uptrend is ending, but it is never a guarantee.
Dow Jones Industrial Average — A famous index that tracks 30 very large, well-known US companies, such as Apple and Walmart. When news reports say "the Dow rose 200 points," this is the index they mean.
Downside — How much you could lose if a trade goes wrong. If you buy a stock at $40 and it could realistically fall to $30, your downside is about $10 a share.
Downtrend — A stretch where a price keeps making lower highs and lower lows, like a staircase going down. The general direction is down even though there are small bounces along the way.
Drawdown — The drop from a high point down to a low point, usually measured in your account or in a stock's price. If your account falls from $10,000 to $8,000, you are in a 20% drawdown.
Due diligence — Doing your homework before putting money into something: reading about the company, checking its finances, and understanding the risks. Never skip it just because someone online is excited.

E

Earnings — A company's profit for a period of time, usually reported every three months. If a company brought in $1 billion and spent $800 million, its earnings are $200 million.
Earnings guidance — A company's own forecast for how it expects to do in the coming months, given when it reports earnings. Stocks often move sharply when a company raises or lowers its guidance.
Earnings per share — A company's profit divided by its number of shares, written as EPS. If a company earned $10 million and has 5 million shares, its EPS is $2 per share.
Earnings report — The official update a company publishes every three months showing its sales, profit, and outlook. Stock prices often jump or drop right after it comes out.
Earnings season — The few weeks, roughly in January, April, July, and October, when most big companies release their earnings reports one after another. Markets tend to be extra jumpy during these weeks.
Economic calendar — A schedule listing upcoming economic reports and events, like jobs numbers, inflation reports, and Federal Reserve meetings. Traders watch it because these events can move the whole market.
Economic indicator — A statistic that shows how the economy is doing, such as the unemployment rate or the inflation rate. Investors watch these numbers to guess where the economy and markets may head next.
Economic moat — A lasting advantage that protects a company from competitors, like a famous brand or being the cheapest producer. The term was popularized by investor Warren Buffett.
Elliott Wave Theory — The idea, followed by some chart traders, that prices move in repeating wave-like patterns driven by crowd psychology. It is a theory for reading charts, not a proven rule, and different traders often count the waves differently.
E-mini futures — Smaller, electronically traded futures contracts on indexes, like the ES, which tracks the S&P 500. Even smaller "micro" versions, like the MES, exist so beginners can trade with less money at risk per point.
End of day — The close of the regular trading session, 4:00 PM Eastern Time for US stocks. Prices quoted as "closing prices" are from this moment.
Engulfing candle — A candlestick pattern of two candles where the second candle's body completely covers the first one's body. A green candle engulfing a red one after a drop can signal buyers taking over, and the reverse can signal sellers taking over.
Entry point — The price at which you get into a trade. If your plan says to buy a stock when it reaches $75, $75 is your entry point.
Equity — Ownership. Owning stock means owning equity in a company, and the word is also used for the total value of your trading account (your cash plus your positions).
Equity curve — A line graph showing the value of a trading account over time. A healthy equity curve generally climbs, while a jagged one crashing downward shows a strategy that is losing money.
ETF — Short for exchange-traded fund: a basket holding many stocks or bonds that you can buy and sell as a single ticker, like a stock, all day long. One share of an S&P 500 ETF gives you a tiny piece of all 500 companies at once.
European-style option — An option that can only be exercised on its expiration day, never before. Many index options work this way — SPX options are European-style and cash-settled.
Ex-dividend date — The first day a stock trades without the upcoming dividend attached. To receive a dividend, you must own the stock before this date; if you buy on or after it, the seller gets the payment instead.
Exchange — The marketplace where trades happen, such as the New York Stock Exchange (NYSE) or the Nasdaq. Think of it as the official store where stocks are bought and sold.
Exchange rate — How much one currency is worth in terms of another. If the EUR/USD rate is 1.10, one euro is worth $1.10.
Exercise — Using the right an option gives you. Exercising a call means buying 100 shares at the strike price; exercising a put means selling 100 shares at the strike price.
Exercise price — Another name for an option's strike price: the set price at which the option lets you buy or sell the stock. A $150 exercise price means the trade happens at $150, no matter where the stock actually trades.
Expense ratio — The yearly fee a fund charges, shown as a percent of your money. An expense ratio of 0.10% means you pay $10 a year for every $10,000 invested in that fund.
Exit point — The price at which you plan to get out of a trade, either to take a profit or to cut a loss. Deciding your exit point before you enter is a core habit of careful traders.
Expiration date — The last day an options contract exists. After this date the option is gone — if it has value it is typically settled automatically, and if not, it expires worthless.
Extended-hours trading — Trading that happens before the regular 9:30 AM open (pre-market) or after the 4:00 PM close (after-hours). Fewer people are trading then, so prices can swing more and orders can fill at worse prices.
Extrinsic value — The part of an option's price that is above its built-in (intrinsic) value — you are paying for time left and expected movement. This is the part that melts away as expiration approaches.

F

Face value — The amount a bond promises to pay back when it ends (matures), usually $1,000 per bond. It is also called par value.
Federal funds rate — The target interest rate, set by the Federal Reserve, that banks charge each other for overnight loans. It influences almost every other interest rate, from credit cards to mortgages.
Federal Reserve (Fed) — The central bank of the United States. Its job is to keep prices stable and employment strong, and its decisions on interest rates move the entire stock market.
Fibonacci retracement — A chart tool that draws lines at set percentages (like 38.2%, 50%, and 61.8%) of a price move, marking spots where a pullback might pause. Many traders watch these levels, though they are guidelines, not guarantees.
Fill — The completion of your order — the moment your buy or sell actually happens. A "fill price" is the exact price you got, which may differ slightly from the price you saw when you clicked.
Financial statement — One of a company's official report cards: the income statement (sales and profit), the balance sheet (what it owns and owes), and the cash flow statement (cash in and out). Public companies must publish these every quarter.
Fiscal year — A company's 12-month accounting year, which does not have to match the calendar year. A retailer might end its fiscal year in January, right after the holiday season.
Fixed income — Investments that pay a set, predictable stream of interest, mainly bonds. People call them fixed income because the payments are scheduled in advance, unlike stock dividends.
Flash crash — A sudden, severe market drop that reverses within minutes. In the famous 2010 flash crash, the Dow fell almost 1,000 points in minutes and then recovered most of it the same day.
Flat — Holding no position at all in something. If you sell all your shares of a stock, you are flat that stock — no risk, no reward from it until you buy again.
Float — The number of a company's shares actually available for the public to trade. A stock with a small float (few shares available) can jump or crash quickly because even modest buying or selling overwhelms it.
FOMC — Short for Federal Open Market Committee, the group inside the Federal Reserve that votes on interest rates. It meets eight times a year, and its announcements are some of the most market-moving events on the calendar.

FOMO — Short for "fear of missing out": the urge to buy something just because its price is running up and everyone is talking about it. FOMO is a feeling, not a strategy, and it leads many beginners to buy at the worst moment.
Forex — Short for foreign exchange: the global market where currencies are traded in pairs, like euros against US dollars (EUR/USD). It is the largest market in the world and trades around the clock on weekdays.
Fractional share — A piece of a share, less than one whole share. If a stock costs $400 and you invest $50, you can own 0.125 of a share instead of nothing.
Freeriding — A cash-account violation: buying a stock with money that has not settled yet and selling it before that money arrives. Doing it can get your account restricted, so wait for funds to settle.
Front month — The futures contract that expires soonest and is usually the most actively traded. When traders say "the ES front month," they mean the nearest upcoming ES contract.
Front-running — When a broker or insider trades ahead of a big client order they know is coming, profiting from the price move that order will cause. It is illegal and unethical.
Fund — A pool of money collected from many people and invested together, such as a mutual fund or an ETF. Instead of picking one stock, your money is spread across everything the fund holds.
Fundamental analysis — Judging an investment by the health of the business itself: its sales, profit, debt, and competition, to decide what it is really worth. It is the opposite of technical analysis, which studies price charts.
Futures — Contracts where two sides agree to trade something (like oil, gold, or a stock index) at a set price on a future date, and both sides must honor the deal. Futures use leverage, so gains and losses are magnified, and beginners can lose money very fast.
Futures contract — One single futures agreement. Each one has a standard size and dollar value per point — for example, each point the ES futures contract moves is worth $50.
Futures expiration — The last day a futures contract can trade before it ends. Traders who do not want delivery close the contract or roll it into the next month's contract before this date.

G

Gain — A profit: you sold something for more than you paid for it. Buying at $30 and selling at $38 is a gain of $8 a share.
Gamma — An options number that shows how fast delta itself changes when the stock moves. High gamma means your option's delta will swing quickly, which makes the position more sensitive and harder to predict near expiration.
Gap — An empty space on a chart where the price opens much higher or lower than where it closed the day before, skipping the prices in between. Earnings news often causes gaps — a stock closing at $50 might open the next morning at $56.
Gap fill — When a stock's price later moves back across a gap, covering the empty space on the chart. If a stock gaps up from $50 to $56 and later falls back to $50, the gap is filled.
Globex — The CME Group's electronic trading platform, where most futures trades happen. It is why futures trade nearly around the clock, from Sunday evening through Friday afternoon, US Eastern Time.
Going long — Buying something because you expect its price to rise. If you own shares of a stock hoping they go up, you are long that stock — the most basic position there is.

Going public — When a private company sells shares to the general public for the first time so anyone can buy them on an exchange. This first sale is called an IPO, an initial public offering.
Going short — Selling something first, planning to buy it back cheaper later, because you expect the price to fall. It is risky: a stock you short can keep rising, so your losses can grow quickly and, with stocks, have no fixed limit.
Golden cross — A chart signal where a stock's 50-day average price crosses above its 200-day average price, after the stock has been rising. Some traders treat it as a hopeful long-term sign, but it is not a guarantee of future gains.
Good faith deposit — A nickname for futures margin: the money you must park in your account to hold a futures contract. It is a deposit showing you can cover losses, not a loan and not the full price of the contract.
Good faith violation — A cash-account violation that happens when you buy a stock with money from a sale that has not settled yet, then sell that new stock before the money settles. Too many of these can get your account restricted for 90 days.
Good 'til canceled (GTC) — An order that stays active until it fills or you cancel it, instead of expiring at the end of the day. A GTC sell order at $60 will sit waiting even if the stock takes two weeks to get there.
Government bond — A loan you make to the US government, sold as a Treasury bond, note, or bill. These are considered among the safest investments in the world and pay you interest.
Greeks — A group of options numbers, named with Greek letters (delta, gamma, theta, vega, and rho), that measure different risks of an option, like how it reacts to price moves, passing time, and volatility. Traders check the Greeks the way a pilot checks dashboard gauges.
Gross domestic product (GDP) — The total dollar value of everything a country produces in a period of time. When GDP grows, the economy is expanding; when it shrinks for two quarters in a row, people often call it a recession.
Gross margin — The share of a company's sales left over after paying the direct cost of making its products, shown as a percent. If a company sells $100 of goods that cost $60 to make, its gross margin is 40%.
Gross profit — The same idea as gross margin, but in dollars instead of a percent: sales minus the direct cost of what was sold. $100 in sales minus $60 in product costs equals $40 of gross profit.
Growth investing — A strategy of buying companies expected to grow much faster than average, even if their stocks look expensive today. The bet is that future growth will be worth the high price.
Growth stock — A stock of a company whose sales and profits are growing much faster than average. These companies usually pay no dividend because they reinvest everything into growing, and their prices can swing hard.

H

Halt — A temporary pause in trading of a stock, set by the exchange. Halts usually happen when big news is coming out or a price is moving too wildly, and trading restarts a few minutes later.
Hammer Candle — A single candle (one bar on a chart) with a long lower tail and a small body near the top. After a fall, it can be an early sign that buyers are stepping in and price may turn up.
Hard Stop — A real stop order you place with your broker that sells automatically if price hits your level. It is "hard" because the broker's computer does it for you, even if you are not watching.
Hard to Borrow — A label for a stock that is difficult or expensive to borrow for short selling (betting it will fall). If a stock is hard to borrow, your broker may charge extra fees or block the short sale entirely.
Head and Shoulders — A chart pattern shaped like a head between two shoulders, made of three peaks where the middle peak is the highest. Traders watch it as a possible sign that an uptrend is tiring out and may reverse down.
Hedge — A second position you take to protect your main position, like insurance. Example: if you own a stock and fear a drop, you might buy a put option so a fall hurts less.
Hedge Fund — A private investment fund for wealthier investors that can use advanced strategies like short selling and leverage. Hedge funds have looser rules than the mutual funds everyday investors buy.
High Beta — Describes a stock that moves more than the overall market, both up and down. A stock with a beta of 2 tends to move about twice as much as the S&P 500, so it is riskier and jumpier.
High of Day — The highest price a stock or contract has traded at so far today, often shortened to HOD. Traders watch it because price pushing above it can signal strength.
High-Yield Bond — A bond from a company with a weaker credit rating, nicknamed a junk bond. It pays higher interest because there is a higher chance the company fails to pay you back.
Higher High — A price peak that is higher than the peak before it. A series of higher highs (with higher lows) is the classic picture of an uptrend.
Higher Low — A price dip that stops at a higher level than the dip before it. It suggests buyers are stepping in earlier each time, which is a sign of an uptrend.
Higher Time Frame — A chart that shows a longer stretch of time per candle, like the daily or weekly chart instead of the 1-minute chart. Big-picture charts show the main trend that smaller charts must fit inside.
Historical Volatility — A measure of how much a stock's price actually moved in the past, based on real price history. It looks backward, unlike implied volatility, which looks forward.
Hold — Keeping a position you already own instead of selling it. If you bought shares and simply keep them while you wait, you are holding.
Holding Period — How long you own something before you sell it. For taxes, holding a stock more than one year usually gets a lower tax rate on profits than selling sooner.
Horizontal Level — A price drawn as a flat line across a chart where price has repeatedly stopped, bounced, or reversed before. Traders treat these levels as likely turning points in the future.
Hot Money — Money that moves in and out of an investment very quickly, chasing fast gains. Hot money rushes in when something is exciting and rushes out just as fast, making prices jumpy.
Hourly Chart — A price chart where each candle covers one hour of trading. Traders use it to see the trend inside the day without the noise of very small time frames.

I

Implied Move — The amount the options market expects a stock to move up or down by a certain date, shown as a dollar amount or a percentage. Traders check it before earnings to see how big a swing is already "priced in."
Implied Volatility — Often shortened to IV, this is how much movement the market expects from a stock in the future, built into option prices. High IV makes options expensive; low IV makes them cheap.
In the Money — Describes an option that already has real value if used right now. Example: a call option with a $50 strike is in the money when the stock trades at $55, because you could buy at $50 and the stock is worth $55.
Income Statement — A company report showing how much money it made and spent over a period, ending with its profit or loss. It answers the basic question: did the business actually make money?
Index — A number that tracks the combined price movement of a group of stocks, like the S&P 500 (500 large companies). You cannot buy an index itself; you trade funds, futures, or options based on it.
Index Fund — A fund that simply copies an index, holding the same stocks in the same proportions. Because no manager is picking stocks, fees are usually very low.
Index Futures — Futures contracts based on a stock index, such as the S&P 500 futures (ES). Traders use them to bet on, or protect against, the whole market moving up or down.
Index Option — An option based on an index instead of a single stock, like SPX options. Index options are settled in cash (no shares change hands) and SPX options can only be exercised at expiration.
Indicator — A tool drawn on or under a chart that does math on price or volume to help you judge the trend or momentum. Examples include moving averages, MACD, and RSI; indicators suggest, they never guarantee.
Inflation — The general rise in prices over time, which means each dollar buys a little less than before. If inflation is 3%, something that cost $100 last year costs about $103 now.
Initial Margin — The amount of money you must put up to open a leveraged position. For stocks it is usually 50% of the purchase; for futures it is a smaller good-faith deposit set by the exchange.
Initial Public Offering (IPO) — The first time a private company sells shares to the public and starts trading on an exchange. After the IPO, anyone with a brokerage account can buy the stock.
Inside Bar — A candle whose entire high-to-low range fits inside the candle before it. It shows price pausing and coiling, and traders watch for a break out of it.
Insider Trading — Buying or selling a stock using secret, important information the public does not have yet. It is illegal, and company executives trading on inside knowledge can face heavy fines and prison.
Institutional Investor — A big organization that invests huge amounts of money, like a pension fund, bank, or hedge fund. Their large trades can move prices, so small traders watch what they do.
Interest Rate — The price of borrowing money, charged as a percentage per year. When the Federal Reserve raises or lowers rates, it affects loans, savings accounts, and usually stock prices too.
Intraday — Anything that happens within a single trading day. An intraday trader (day trader) opens and closes all positions before the market closes and holds nothing overnight.
Intrinsic Value — The built-in, real value of an option if it were used right now. A call with a $50 strike has $5 of intrinsic value when the stock is $55; anything above that in the option's price is time value.

Inverse ETF — A fund designed to go up when its index goes down, and down when the index goes up. It lets you profit from a falling market without short selling, but it is built for short-term trades, not long holds.
Investing — Buying something and holding it for months or years, expecting it to grow in value over time. It is the slower, longer-term cousin of trading.
Investment Grade — A quality rating for bonds meaning the borrower is considered fairly safe and likely to repay. Bonds below investment grade are called high-yield or junk bonds.
Investor — Anyone who puts money into something hoping it grows. You become an investor the moment you buy your first share, fund, or bond.
Iron Butterfly — An options strategy using four options that profits most if the stock lands exactly on one middle price at expiration. Risk and reward are both capped, and it is an advanced strategy.
Iron Condor — An options strategy that sells both a call spread above the price and a put spread below it, collecting premium. You profit if the stock stays inside a range, and your maximum loss is capped and known up front.
IV Crush — The sharp drop in implied volatility right after a big expected event, like an earnings report, passes. Option prices can fall hard from IV crush even when the stock moves the way you predicted.
IV Rank — A number from 0 to 100 showing where today's implied volatility sits compared with its own range over the past year. Near 100 means options are unusually expensive versus their own history; near 0 means unusually cheap.

J

January Effect — The idea that stock prices, especially smaller stocks, tend to rise more in January than in other months. It is a historical pattern some traders watch, not a promise it will happen.
Jobs Report — A monthly government report on how many jobs were added or lost and the unemployment rate, usually released on the first Friday of the month. It often moves the whole market within seconds because it hints at the economy's health.
Joint Account — A brokerage account owned by two people, such as spouses, where both can deposit money and place trades. Either owner can usually act on the account without the other's permission.
Journal — A written record of every trade you take, including why you entered, where you exited, and what you learned. Reviewing your journal is how traders find and fix their repeated mistakes.
Junk Bond — A nickname for a high-yield bond from a company with a weak credit rating. It pays high interest to make up for the real risk the company might not pay you back.

K

Keltner Channels — An indicator that draws two bands above and below a moving average, spaced by how much price typically moves. Price bouncing between or breaking out of the bands helps traders judge trends and stretched moves.
Key Level — An important price where traders expect a reaction, such as a past high, a past low, or a round number like $500. Plans are often built around key levels: buy near support, sell or protect near resistance.
Know Your Customer (KYC) — The legal rule that brokers must verify who you are before opening your account. That is why signing up asks for your ID, address, and Social Security number.

L

Large Cap — A big company, usually worth $10 billion or more, like Apple or Walmart. "Cap" is short for market capitalization, the total value of all its shares.
Last Price — The most recent price at which a stock or contract actually traded. It is the number most apps show in big digits next to the ticker.
Last Trading Day — The final day a futures or options contract can be traded before it expires. After this day the contract is settled, so traders must close or roll their position before it.
Level 2 — A data feed showing the stack of waiting buy and sell orders at many prices, not just the best one. It helps traders see where large orders are sitting, though reading it well takes practice.
Leverage — Using borrowed power so a small amount of your money controls a much bigger position. Leverage multiplies gains and losses equally — a 10-to-1 leveraged position loses 10% of your money on just a 1% move against you.
Leveraged ETF — A fund that uses borrowing and derivatives to multiply an index's daily move, aiming for 2 or 3 times the return. Because it resets daily, holding it for weeks can produce surprising results, and it is risky for beginners.
Limit Move — The maximum amount a futures price is allowed to move in one session before the exchange pauses or restricts trading. It is a safety brake against panic moves.
Limit Order — An order to buy or sell only at your chosen price or better. A buy limit at $50 means you pay $50 or less — but if price never reaches $50, your order simply never fills.
Limit Price — The exact price you set on a limit order; the worst price you are willing to accept. For a buy it is your ceiling, and for a sell it is your floor.
Liquidation — Selling a position to turn it back into cash, whether by your choice or by force. If your margin account falls too far, your broker can liquidate (force-sell) your positions without asking.
Liquidity — How easily something can be bought or sold without moving its price much. A heavily traded stock like Apple is very liquid; a rarely traded stock can be hard to exit at a fair price.
Liquidity Provider — A firm that constantly posts prices to buy and sell, making it easy for everyone else to trade. Their activity keeps markets smooth and bid-ask spreads small.
Liquidity Risk — The danger that you cannot sell something quickly at a fair price when you want out. It shows up in thinly traded stocks and options, where you may have to accept a much worse price.
Long — Owning something because you expect its price to rise. If you buy 10 shares of a stock, you are "long 10 shares," and you profit when the price goes up.
Long-Term Capital Gain — Profit from selling something you held for more than one year. In the US it is usually taxed at a lower rate than short-term profits — tax rules change, so check with a tax professional.
Long-Term Investing — Buying and holding for years through ups and downs instead of reacting to daily moves. Retirement accounts are the most common example.
Loss — What happens when you sell something for less than you paid, or a position moves against you. Small, planned losses are a normal cost of trading; the goal is keeping them small.
Loss Limit — A personal rule for the most you will lose before stopping, such as "I stop trading after losing $100 in a day." It protects your account on days when nothing is working.

Lot Size — The standard amount of something in one trade. One stock options contract covers 100 shares, and one futures contract covers a set amount defined by the exchange.
Low of Day — The lowest price a stock or contract has traded at so far today, often shortened to LOD. Traders watch it because dropping below it can signal weakness.
Lower High — A price peak that is lower than the peak before it. Combined with lower lows, it is the classic picture of a downtrend.
Lower Low — A price dip that falls lower than the dip before it. It shows sellers are pushing price to new lows, a sign of a downtrend.

M

MACD — An indicator (Moving Average Convergence Divergence) that compares two moving averages to show momentum — whether a trend is speeding up or slowing down. Traders watch its lines cross as a possible signal that momentum is changing.
Maintenance Margin — The minimum amount of money that must stay in your margin account while a position is open. If your account drops below it, you get a margin call.
Margin — Borrowed money or buying power from your broker that lets you control more than your cash alone could. For futures, margin means something different: a good-faith deposit you post to hold a contract, not a loan.
Margin Account — A brokerage account that lets you borrow money from the broker, use unsettled funds, and sell short. It offers flexibility but charges interest on loans and carries extra rules and risks.
Margin Call — A demand from your broker to add money or close positions because your account fell below the required minimum. If you do not act, the broker can sell your positions for you.
Mark Price — The fair, calculated value used for a futures contract at any moment, based on the underlying market. Brokers use it to figure your profit, loss, and margin fairly.
Mark to Market — The daily process of settling futures accounts: each day, gains are credited and losses are debited in cash based on the closing price. Your futures profit and loss becomes real money in the account every day.
Market Breadth — A measure of how many stocks are rising versus falling across the whole market. Strong breadth means most stocks are joining a move; weak breadth means only a few are carrying it.
Market Cap — The total value of a company in the stock market: share price multiplied by the number of shares that exist. A $50 stock with 100 million shares has a market cap of $5 billion.
Market Crash — A sudden, steep fall in stock prices across the whole market, like the drops in 2008 and March 2020. Crashes are frightening but have historically been followed by recoveries over time.
Market Depth — The full picture of waiting buy and sell orders at many price levels, shown in Level 2 data. More depth means bigger orders can trade without moving the price much.
Market Hours — The times a market is open. US stock exchanges trade 9:30 AM to 4:00 PM Eastern on weekdays, while CME futures trade almost around the clock from Sunday evening to Friday.
Market Maker — A firm whose job is to always offer a price to buy and a price to sell, so trading never stalls. They earn money from the small gap between those two prices, called the spread.
Market Order — An order to buy or sell right now at whatever the current price is. It almost always fills immediately, but in a fast or thin market the price you get can be worse than expected.

Market Sentiment — The overall mood of traders — fearful, greedy, or somewhere between. Sentiment helps explain why prices sometimes move more than the news alone would suggest.
Market Timing — Trying to buy before rises and sell before falls based on predictions. It sounds simple but is famously hard, because you must be right twice: getting out and getting back in.
Max Pain — The price where, at expiration, the largest number of option contracts would expire worthless and option buyers as a group lose the most. Some traders watch it as a magnet price, though it is a theory, not a rule.
Maximum Loss — The most money a trade can possibly lose, if it can be known in advance. A bought option's maximum loss is the premium you paid; defined-risk spreads also have a fixed maximum loss.
Mean Reversion — The idea that prices that stretch far from their average tend to drift back toward it, like a rubber band snapping back. Traders who use it buy sharp dips and sell sharp spikes.
Micro Futures — Smaller versions of popular futures contracts, one-tenth the size of the standard "E-mini" contracts. The Micro E-mini S&P 500 (MES) is worth $5 per point instead of $50, so beginners risk far less per trade.
Microcap Stock — A very small company, usually worth under $300 million. Microcaps can swing wildly and are often thinly traded, making them risky for beginners.
Mid Cap — A medium-sized company, usually worth between about $2 billion and $10 billion. Mid caps sit between small caps and large caps in both growth potential and stability.
Mid Price — The halfway point between the bid (what buyers offer) and the ask (what sellers want). Traders often try to get filled near the mid price instead of paying the full ask.
Mini (E-mini) Futures — The standard-sized electronic futures contracts on stock indexes, like the E-mini S&P 500 (ES), worth $50 per point. They are the most heavily traded futures in the world, and the micro contracts are their one-tenth-size versions.
Momentum — The tendency of prices that are moving strongly in one direction to keep moving that way for a while. Momentum traders buy what is rising and sell what is falling, following the move rather than fighting it.
Money Market Fund — A very conservative fund that holds short-term, low-risk debt and aims to keep its value at $1 per share. Many brokers park your uninvested cash in one automatically.
Moneyness — The relationship between a stock's price and an option's strike price. It describes whether an option is in the money (has real value now), at the money (strike equals the stock price), or out of the money (no real value yet).
Moving Average — A line on a chart showing the average price over the last set number of candles, like the 20-day or 200-day average. It smooths out the bumps so the main trend is easier to see.
Multi-Leg Order — One order that buys and sells two or more options (or futures) together as a package, like a spread. It makes sure all parts fill together at one combined price.
Multiplier — The number that turns an option's quoted price into its real cost. Stock options have a multiplier of 100, so a $2.50 premium really costs $2.50 × 100 = $250 per contract.
Mutual Fund — A pooled fund where many investors' money is combined and managed together, priced once per day after the market closes. Unlike ETFs, you cannot trade a mutual fund during the day.

N

Naked Option — An option sold by someone who does not own the shares or the offsetting position behind it. It can lose far more than the price it was sold for, so brokers only allow it for experienced traders with large accounts.
NASDAQ — A major American stock exchange where shares are bought and sold electronically. Many famous technology companies, like Apple and Microsoft, trade here.
Nasdaq-100 — An index (a numbered scorecard) of 100 of the largest non-bank companies listed on the NASDAQ, mostly technology names. It is the index the popular QQQ fund follows.
Nasdaq Composite — An index that tracks nearly every stock listed on the NASDAQ exchange — more than 3,000 companies. When news reports say "the Nasdaq rose today," they usually mean this number.
Net Asset Value (NAV) — The value of everything a fund owns, minus what it owes, divided by its shares. It is the per-share worth of a fund, figured out at the end of each trading day for mutual funds.
Net Change — How much a price moved compared to the previous day's closing price. If a stock closed at $50 yesterday and $52 today, its net change is +$2.
Net Income — A company's profit after every cost, bill, and tax is paid. If a shop takes in $10,000 and spends $8,000 on everything, its net income is $2,000.
Net Liquidation Value (Net Liq) — The cash value of your whole account if you closed every position right now at current prices. Broker apps show this number as the real-time worth of your account.
New Highs and New Lows — A daily count of stocks reaching their highest or lowest price of the past year (usually 52 weeks). Lots of new highs suggests a strong market; lots of new lows suggests a weak one.
New York Stock Exchange (NYSE) — The largest stock exchange in the United States, based on Wall Street in New York City. Companies like Walmart and Coca-Cola trade here.
News Catalyst — A news event that pushes a stock's price, such as an earnings report, a new product, or a government announcement. Traders watch for catalysts because quiet stocks often start moving when big news hits.
Nonfarm Payrolls (NFP) — A government report, usually released on the first Friday of each month, showing how many jobs the US economy added or lost. It often causes big, fast moves in stocks, futures, and currencies.
Notional Value — The total dollar value a futures contract controls, found by multiplying the contract size by the price. One oil futures contract controls 1,000 barrels, so at $70 a barrel its notional value is $70,000 — far more than the deposit you put down.

O

Odd Lot — An order for fewer than 100 shares of a stock. Buying 25 shares is an odd lot; it still works fine, it is just smaller than the standard block.
Offer (Ask Price) — The lowest price a seller is currently willing to accept for a stock or contract. When you buy at market, this is roughly the price you pay.
OHLC (Open, High, Low, Close) — The four key prices of any time period: where it started, the highest trade, the lowest trade, and where it ended. Every candle on a chart is drawn from these four numbers.

Open — The price of the first trade of the day (or of any candle's time period). The word is also a verb — to "open" a position means to start a new trade.
Open Interest — The total number of option or futures contracts that exist right now and have not been closed, exercised, or expired. High open interest means lots of traders are involved in that contract.
Open Order — An order you have placed that has not filled yet and has not been canceled. A limit order waiting for your price is an open order.
Open Position — Any trade you are still holding. If you own 50 shares of a stock right now, that is an open position until you sell them.
Opening Bell — The bell rung at 9:30 a.m. Eastern Time that starts regular US stock market hours. Prices often move quickly in the first minutes after it rings.
Opening Range — The high and low prices from the first few minutes of the trading day, often the first 5, 15, or 30 minutes. Many day traders watch this range as a map for the rest of the day.
Option — A contract that gives you the right, but not the obligation, to buy or sell a stock at a set price (the strike price) before a set date (the expiration). You pay a fee, called the premium, for that right.
Option Chain — The big price list for a stock's options, showing every strike price and expiration date with the current price of each call and put. Think of it as the menu you order options from.
Option Contract — One single option. A standard stock option contract controls 100 shares, so a premium quoted at $2.50 costs you $250 for one contract.
Option Seller (Writer) — The person on the other side of an option trade, who collects the premium and takes on the obligation if the buyer uses the option. Selling options can bring in income but can carry large risk.
Options Approval — Permission your broker gives you to trade options, granted in levels based on your experience and account. Beginners usually start with basic levels, like buying calls and puts, before spreads or selling options are allowed.
Options Expiration — The date an option contract ends. If the option has no value by the end of that day, it expires worthless and the buyer loses the premium paid.
Order — An instruction you give your broker to buy or sell. A market order fills right away at the current price, while a limit order only fills at your chosen price or better.
Order Book — The live list of buy and sell orders waiting at different prices for a stock or contract. Traders look at it to see how many buyers and sellers are lined up.
Order Flow — The stream of buy and sell orders coming into the market right now. Watching order flow helps some traders judge whether buyers or sellers are more aggressive at the moment.
Oscillator — A technical indicator that swings back and forth between set bounds, like 0 and 100, to suggest a stock may have risen or fallen too far, too fast. The RSI is the most famous example.
Out-of-the-Money (OTM) — Describes an option with a strike price that is currently on the losing side. A call is out-of-the-money when its strike is above the stock price; a put is out-of-the-money when its strike is below it — such options are cheaper but need a bigger move to pay off.
Outstanding Shares — The total number of a company's shares that exist and are held by all investors. Multiply this by the share price and you get the company's market cap (total value).
Over-the-Counter (OTC) — Trading that happens away from the big exchanges like the NYSE and NASDAQ, usually in tiny, little-known companies. OTC stocks follow looser rules and are much riskier than exchange-listed stocks.
Overbought — A word traders use when a price has risen a lot in a short time and may be due for a pause or pullback. An RSI reading above 70 is a common overbought signal, but it is a hint, not a guarantee.
Overnight Session — Trading that happens outside regular daytime hours. Futures trade nearly around the clock on weekdays, and stocks can trade in pre-market and after-hours sessions with less activity.
Oversold — The opposite of overbought: a price has fallen a lot in a short time and may be due for a bounce. An RSI reading below 30 is a common oversold signal, but prices can keep falling anyway.
Overvalued — When a stock's price looks higher than the underlying business seems to be worth, based on its earnings, sales, or growth. An overvalued stock can be a great company and still be a risky buy at that price.

P

P/E Ratio (Price-to-Earnings) — A popular way to judge whether a stock is cheap or expensive: share price divided by the company's yearly profit per share. A $100 stock earning $5 per share has a P/E of 20, meaning buyers pay $20 for each $1 of yearly profit.
Panic Selling — When frightened investors all rush to sell at once, pushing prices down fast. It often happens after bad news and can make prices drop far below what a company is really worth.
Paper Trading — Practicing with a pretend-money account that uses real market prices. It lets you learn how orders, options, and futures work without risking a single real dollar.
Par Value — The face value printed on a bond or stock certificate — the amount a bond promises to pay back at the end. US bonds are commonly issued with a par value of $1,000.
Partial Fill — When only part of your order gets completed because there were not enough buyers or sellers at your price. If you ordered 200 shares and only 120 traded, you got a partial fill.
Pattern (Chart Pattern) — A shape that price repeatedly draws on a chart, such as a triangle or a flag, that traders watch for clues about what might happen next. Patterns can help plan trades, but none of them work every time.
Pattern Day Trader (PDT) — A label for someone who makes four or more day trades within five business days in a margin account. Under the classic US rule, pattern day traders must keep at least $25,000 in account equity — but US regulators have been replacing this rule with new intraday-margin standards and brokers are transitioning, so check your own broker's current rule before relying on either version.
Penny Stock — A stock trading under $5 per share, usually from a very small company. Penny stocks can swing wildly, are hard to sell quickly, and are a favorite target of scams, so beginners should be extremely careful.
Pip — The smallest standard price step in currency (forex) trading, usually the fourth decimal place. If EUR/USD moves from 1.0850 to 1.0851, it moved one pip.
Pivot Point — A price level worked out from the previous day's high, low, and close that traders use as a possible turning point. Prices often stall or reverse near pivot points, so many traders mark them on their charts.
Point (Futures) — A full 1.00 move in a futures price. Its cash value depends on the contract: on the E-mini S&P 500 (ES) one point is worth $50, while on the Micro version (MES) one point is worth $5.

Portfolio — Everything you own across your investment accounts — all your stocks, funds, options, and cash combined. Looking at your portfolio means looking at the whole picture, not just one trade.
Position — One holding or trade you currently have open, like 100 shares of a stock or two option contracts. Traders say "I have a position in Apple" to mean they are in that trade right now.
Position Sizing — Deciding how much money to put into each trade before you enter it. Good position sizing makes sure one bad trade can never wipe out your account.
Pre-Market Trading — Trading that happens before the regular 9:30 a.m. Eastern open, available through most brokers. Prices can jump on overnight news, but fewer traders are active, so moves can be jumpy.
Premium — The price you pay to buy an option, quoted per share. Since one contract covers 100 shares, a $2.50 premium costs $250 per contract — and for a buyer, that $250 is the most you can lose on the trade.
Price Action — Reading the movement of price itself — the candles, trends, and support and resistance levels on a chart — instead of relying on indicators. It is the skill of watching what price is actually doing, bar by bar.
Price Improvement — When your broker fills your order at a better price than the one publicly quoted. Even a few cents of price improvement per share adds up over many trades.
Price Target — The future price an analyst predicts a stock will reach, usually within about a year. It is an educated opinion, not a promise — analysts are often wrong.
Primary Market — Where brand-new securities are sold for the very first time, like a company selling shares to the public in an IPO. Money paid here goes to the company itself, not to another investor.
Profit and Loss (P&L) — The total amount of money you have made or lost. A gain or loss is "realized" once you sell and lock it in; before that it is "unrealized" — just on paper, and it can still change.
Profit Margin — The share of a company's sales it keeps as profit after costs. If a company sells $100 of goods and keeps $10 as profit, its profit margin is 10%.
Profit Target — A price or profit level you choose in advance where you plan to sell and take your winnings. Setting a profit target before entering stops greed from making your decisions mid-trade.
Protective Put — A put option bought by someone who owns the stock, as insurance. If the stock falls hard, the put gains value and cushions the loss, like a seatbelt for your shares.
Public Company — A company whose shares are sold to the general public on a stock exchange, so anyone can buy a piece of it. Apple and Walmart are public companies; your local family restaurant is not.
Pullback — A temporary dip in price during an overall uptrend, like a short rest during a climb. Traders often wait for a pullback to buy at a slightly better price.
Pump and Dump — A scam where promoters hype up a cheap stock so the price rises ("pump"), then sell their own shares at the top and leave everyone else holding the crash ("dump"). It is illegal and mainly targets beginners — avoid any stock being pushed by strangers online.
Put Option — A contract giving you the right to sell 100 shares at the strike price before expiration. Puts generally gain value when the stock falls; for example, a $50 put bought for $2.00 breaks even at $48 at expiration.
Put/Call Ratio — The number of put options traded compared to calls in a market or stock. A high ratio means traders are buying more downside protection (fear); a low ratio suggests more optimism.

Q

QQQ — The ticker symbol of a hugely popular fund (ETF) that tracks the Nasdaq-100 index. Buying one share of QQQ is like buying a small slice of 100 big Nasdaq companies at once.
Quadruple Witching — A day, four times a year (the third Friday of March, June, September, and December), when several kinds of options and futures contracts expire at the same time. These days often bring extra trading volume and sharper price swings.
Quantitative Easing (QE) — When the US central bank (the Federal Reserve) buys large amounts of bonds to pump money into the financial system and push interest rates down. It is meant to encourage borrowing and spending, and markets often rise while it runs.
Quarterly Earnings Report — A report card every public company must publish about every three months, showing its sales and profits. Stock prices can jump or drop sharply in the hours after one is released.
Quick Ratio — A simple check of whether a company could pay its near-term bills using only its most easily-sold assets, like cash. A ratio above 1 means it has more quick assets than short-term debts.
Quote — The current prices being offered for a stock or contract: the bid (what buyers will pay) and the ask (what sellers want). When you "get a quote," you are seeing those live numbers.

R

Rally — A strong rise in a price over hours, days, or weeks. After weeks of falling, a market that climbs steadily for several days is said to be rallying.
Range — The distance between a price's high and its low over a period, or the zone a price keeps bouncing inside, between support below and resistance above. A stock trapped between $90 and $100 is "trading in a range."
Rate Hike and Rate Cut — When the Federal Reserve raises (hike) or lowers (cut) its main target interest rate. Hikes make borrowing more expensive and often pressure stocks; cuts do the opposite.
Real-Time Quote — A price that is live right now, with no delay. Some free websites and apps show prices delayed by 15 minutes or more, which is too slow for active trading.
Realized Gain or Loss — A profit or loss that is final because you have closed the trade. If you buy at $40 and sell at $46, your $6-per-share gain is realized — it is yours to keep.
Rebalancing — Adjusting your portfolio back to your planned mix after prices move. If your plan was 60% stocks and 40% bonds and stocks grew to 70%, rebalancing means selling some stocks and buying bonds to restore the mix.
Recession — A period when the overall economy shrinks and business slows down, often described as two quarters (six months) in a row of falling economic output. Jobs get harder to find, company profits fall, and stock markets usually struggle.
Regular Trading Hours (RTH) — The main US stock market session: 9:30 a.m. to 4:00 p.m. Eastern Time, Monday through Friday, excluding holidays. This is when trading is busiest and prices are most reliable.
Regulation T (Reg T) — The US rule that lets a broker lend you up to 50% of the purchase price when you first buy stock in a margin account. Buy $10,000 of stock and you must put up at least $5,000 of your own money at the start.

Relative Strength Index (RSI) — A popular indicator that scores recent price momentum from 0 to 100. Readings above 70 suggest a stock may be overbought, and readings below 30 suggest it may be oversold — signals to pay attention, never guarantees.
Resistance — A price level where a rising stock keeps getting pushed back down, like a ceiling. If a stock fails to get past $100 three times, traders call $100 resistance.
Retracement — A partial move back against the main trend. If a stock climbs from $100 to $120 and then slips to $110, it has retraced half of the move — traders watch these pullbacks for chances to join the trend.
Return — The gain or loss on your money, usually shown as a percentage. Making $100 on a $1,000 investment is a 10% return.
Revenue — The total money a company takes in from selling its products or services, before subtracting any costs. It is also called sales or the "top line" because it sits at the top of the financial report.
Reversal — When a price trend changes direction — an uptrend ends and prices start falling, or a downtrend ends and prices start rising. Catching the exact moment of a reversal is one of the hardest things in trading.
Reward-to-Risk Ratio — A comparison of how much you could make on a trade versus how much you could lose, worked out before you enter. Risking $100 to aim for $300 is a 3-to-1 reward-to-risk ratio.
Risk — The chance that you will lose money on a trade or investment. Every trade has risk; the goal of learning is not to remove it, but to control how much of it you take.
Risk Management — The set of habits and rules that protect your account: sizing positions small, using stop losses, and never betting too much on one idea. It is the main skill that separates long-lasting traders from gamblers.
Risk Tolerance — How much loss and how big a price swing you can handle, both in your wallet and in your stomach. A person who cannot sleep when their account drops 10% has a low risk tolerance and should trade smaller.
Risk-On / Risk-Off — A quick way to describe the market's mood. "Risk-on" means investors feel brave and buy stocks and other growth assets; "risk-off" means they feel cautious and move toward safer assets like cash and bonds.
Roll (Rolling a Position) — Closing a contract that is about to expire and opening the same kind of position in a later expiration, to keep the trade going. Futures traders roll to the next month's contract, and option traders roll to a later date (and sometimes a different strike).
Rotation (Sector Rotation) — When big investors move money out of one group of stocks and into another — for example, out of technology and into energy. Watching rotation shows where money is flowing across the market.
Round Lot — The standard block of 100 shares of a stock. Prices are often quoted and big orders filled in round lots, though today anyone can buy even a single share.
Round Trip — One complete trade: opening a position and closing it again. Buying a stock on Monday and selling it on Tuesday is one round trip.

S

S&P 500 — A list of 500 of the biggest companies in the United States, tracked as one number that goes up and down. When people say "the market went up today," they often mean this list went up.
Scalping — A very fast style of trading where you buy and sell within minutes, or even seconds, trying to grab tiny profits many times a day. It is fast, stressful, and hard for beginners.
Seasonality — The idea that prices sometimes follow patterns tied to the time of year, like certain months often being stronger than others. It is a tendency, not a guarantee.
SEC (Securities and Exchange Commission) — The United States government agency that polices the markets. It makes the rules public companies and brokers must follow and punishes fraud.
Secondary Market — The market where regular people buy and sell stocks to each other after the shares first exist. Almost everything you will ever trade happens here, on exchanges like the New York Stock Exchange and Nasdaq.
Secondary Offering — When a company sells more new shares after it is already public. It raises cash for the company but can push the price down because there are now more shares sharing the same company.
Sector — A group of companies that do similar business, like technology, healthcare, energy, or banks. Traders watch sectors because stocks in the same sector often move together.
Sector Rotation — When big investors move money from one sector into another as the economy changes. For example, money might leave technology stocks and flow into energy stocks.
Securities — A general word for tradable financial assets: stocks, bonds, options, and similar products. If you can buy and sell it on a market, it is probably a security.
Sell-Off — A sudden wave of selling that pushes prices down quickly. It often happens when bad news scares many holders into selling at the same time.
Sell to Close — An order that sells an option you already own, ending that position. If you bought a call for $200 and sell to close at $300, you keep the $100 difference minus fees.
Sell to Open — An order that creates a brand-new short option position by selling an option you do not own yet. You collect money (the premium) up front but take on an obligation, which can be risky.
Session (Trading Session) — One full day of trading. For US stocks, the regular session runs 9:30 AM to 4:00 PM Eastern Time.
Settlement — The final step of a trade, when the money and the shares officially change hands and become fully yours. Buying a stock feels instant, but settlement happens behind the scenes a little later.
Settlement Price — The official closing price a futures exchange sets at the end of each day. Your futures account gains and losses are calculated from this price.
Share — One small unit of ownership in a company. If a company has 1,000 shares and you own 10, you own 1% of that company.
Share Class — Some companies sell different types of shares, often called Class A and Class B. They may carry different voting power even though they represent ownership in the same company.
Share Price — The cost of one single share of a stock at a given moment. If a stock shows $50, that is the price for one share, not the whole company.
Shares Outstanding — The total number of shares of a company that exist and are held by everyone. Multiply this by the share price and you get the company's total market value (market cap).

Short Covering — Buying back shares you previously sold short, which closes your short position. If many short sellers cover at once, the rush of buying can push the price up fast.
Short Interest — The total number of a stock's shares that have been sold short and not yet bought back. High short interest means many traders are betting the price will fall.
Short Position — A position that profits when a price goes down and loses when it goes up. You can be short by selling shares you borrowed, or by holding options that gain when price falls.
Short Selling — Borrowing shares from your broker, selling them at today's price, and hoping to buy them back cheaper later to return them. If the price rises instead, losses can keep growing with no limit.
Short Squeeze — When a heavily shorted stock jumps in price and short sellers rush to buy back shares to stop their losses. That extra buying pushes the price even higher, very fast.
Sideways Market — A market that drifts up and down inside a range without a clear direction. Prices move, but they do not really go anywhere over time.
Simple Moving Average (SMA) — A line on a chart that averages a stock's price over a set number of days, like the last 50 days. It smooths out daily wiggles so the bigger trend is easier to see.
Slippage — The small difference between the price you expected and the price your order actually filled at. It happens most when prices move fast or few people are trading.
Small-Cap Stock — A stock of a smaller company, usually worth between about $300 million and $2 billion in total. Small-caps can grow fast but tend to swing more and are riskier than big-company stocks.
Speculation — Buying something mainly because you hope its price moves your way soon, accepting a real chance of losing money. It is different from long-term investing, and most trading is speculation.
Spot Price — The price of something right now, for immediate delivery. When a news report names the price of gold or oil, that is the spot price.
Spread — Most often, the small gap between the highest price a buyer offers (the bid) and the lowest price a seller accepts (the ask). It can also mean a trade built from two or more options at the same time.
Standard Deviation — A math measure of how much prices usually swing around their average. A bigger number means wilder, jumpier price movement.
Stock — A piece of ownership in a company. When you buy a stock, you own a small slice of that business and your money rises or falls with it.
Stock Buyback — When a company uses its own cash to buy its shares back from the market. Fewer shares remain, so each remaining share represents a slightly bigger slice of the company.
Stock Dividend — A dividend paid in extra shares instead of cash. If you own 100 shares and get a 5% stock dividend, you receive 5 more shares.
Stock Exchange — An organized marketplace where stocks and other securities are bought and sold, like the New York Stock Exchange (NYSE) and Nasdaq. Exchanges enforce rules so trading is fair and orderly.
Stock Index — A number that tracks the combined performance of a chosen group of stocks, like the S&P 500 or the Nasdaq-100. You cannot buy an index directly; you trade funds, futures, or options based on it.
Stock Market — The whole system of exchanges and networks where company shares are bought and sold. It is where businesses raise money and everyday people invest.

Stock Quote — The latest price information for a stock: its last trade price, the current bid and ask, and how much it has moved today. Your broker app shows quotes all day long.
Stock Screener — A search tool that filters thousands of stocks by rules you pick, like price, size, or how much they moved today. It helps you find candidates instead of scrolling everything.
Stock Split — When a company cuts each share into several cheaper shares. In a 2-for-1 split, your 10 shares at $100 become 20 shares at $50 — you own the same total value.
Stop Hunting — When price briefly pushes past a level where many stop orders sit, triggering them, then reverses. It is one reason beginners sometimes get stopped out right before price goes their way.
Stop-Limit Order — An order that becomes a limit order once price reaches your stop price. It protects you from a terrible fill price, but if price jumps past your limit, the order may never fill at all.
Stop Order (Stop Loss) — An order that sits waiting until price reaches your chosen level, then becomes a market order to get you out. Traders use it to cap a loss — for example, sell automatically if a $50 stock falls to $45.
Straddle — An options trade that buys a call and a put at the same strike price and expiration. It profits if the stock makes a big move in either direction, and loses if price stays quiet.
Strangle — Like a straddle, but the call and put have different strike prices, usually a put below the current price and a call above it. It costs less than a straddle but needs an even bigger move to profit.
Strike Price — The fixed price written into an option contract. A call's strike is the price you may buy the stock at; a put's strike is the price you may sell it at.
Supply and Demand — The basic engine of every price: more eager buyers than sellers pushes price up, and more eager sellers than buyers pushes it down. Every chart move comes back to this.
Support — A price area where a falling stock has tended to stop and bounce, like a floor. Buyers have stepped in there before, so traders watch to see if they do it again.
Swing Trading — A style of trading that holds positions for a few days to a few weeks, aiming to catch a medium-sized move. It is slower than day trading and does not require watching the screen all day.
Symbol (Ticker) — The short code that identifies a stock or fund, like AAPL for Apple or SPY for a popular S&P 500 fund. You type the symbol into your broker app to find and trade it.

T

T+1 Settlement — The current US rule (since May 2024) that stock trades officially settle one business day after the trade. Sell a stock on Monday, and the cash is fully settled on Tuesday.
Take Profit — Deciding in advance the price at which you will sell and lock in a gain. Many traders place a take-profit order so the exit happens automatically instead of getting greedy.
Takeover — When one company buys control of another company. The target company's stock often jumps because the buyer usually pays more than the current price.
Tape Reading — Watching the live stream of actual trades — prices, sizes, and speed — to judge whether buyers or sellers are stronger right now. It is one of the oldest skills in trading.
Target Price — The price level where you plan for a trade to reach, or a price an analyst publishes as their estimate of a stock's value. It is a goal or opinion, never a promise.
Tax-Loss Harvesting — Selling a losing position on purpose near year-end so the loss can lower your taxes, while staying invested in something similar. Tax rules here are tricky, so this is educational only — talk to a tax professional.
Technical Analysis — Studying price charts and trading volume to make trading decisions, instead of studying the company's business. It assumes past price patterns and trends can help time entries and exits.
Theta — A measure of how much value an option loses each day just because time is passing. If an option's theta is −0.05, it loses about $5 per contract per day, all else equal.
Thin Market — A market or stock with very few buyers and sellers active. Prices can jump around on small orders, spreads get wide, and getting in or out at a fair price is harder.
Tick — The smallest amount a price is allowed to move. For most stocks one tick is one cent; for futures it varies by product, such as 0.25 points on the ES.
Tick Value — The dollar value of one tick in a futures contract. On the ES, one tick (0.25 points) is worth $12.50 per contract; on the smaller MES it is $1.25.
Time and Sales — A live feed showing every trade as it happens: price, number of shares or contracts, and time. It is the raw data tape readers watch.
Time Decay — The daily shrinking of an option's time value as expiration gets closer. It speeds up in the final days, which is why bought options can melt away even when the stock barely moves.
Time Value — The part of an option's price that comes from time remaining and the chance of a big move, rather than from the stock's current price. A $60 call on a $55 stock trading at $2 is all time value.
Timeframe — The amount of time each candle or data point on your chart represents, like 1 minute, 1 hour, or 1 day. Day traders use short timeframes; investors use daily and weekly ones.
Top Line — A company's total sales (revenue), the first line on its earnings report. The "bottom line" is what is left as profit after all costs.
Total Return — Everything you earn from an investment combined: price gains plus dividends or interest. A stock up 5% that also paid a 2% dividend gave a total return of about 7%.
Trade Confirmation — The official record your broker sends after a trade, showing what you bought or sold, the price, and the fees. Always check it to make sure the trade matches what you intended.
Trade Date — The day a trade actually happens. This is different from the settlement date, which is when the money and shares officially change hands.
Trade Journal — A notebook or spreadsheet where you record every trade: why you entered, where you exited, and what you learned. Reviewing it is one of the fastest ways for beginners to improve.
Trader — A person who buys and sells in the markets, usually aiming for shorter-term moves than an investor. Traders can trade stocks, options, futures, and more.
Trading Halt — A temporary pause in trading of a stock or the whole market, ordered by the exchange. Halts happen during extreme moves or while important news is released.
Trading Plan — A written set of rules you decide before trading: what you trade, when you enter, how much you risk, and when you exit. A plan keeps emotions from running your money.
Trading Psychology — How emotions like fear, greed, hope, and revenge affect trading decisions. Managing your mindset is often harder than learning the charts.
Trading Range — The space between a high price (resistance) and a low price (support) where a stock keeps bouncing back and forth. Traders say a stock is "range-bound" while it stays inside.

Trailing Stop — A stop order that follows the price as it rises, staying a set distance below it. If a stock climbs from $50 to $60, a $5 trailing stop rises to $55, locking in gains if price falls.
Trailing Twelve Months (TTM) — Numbers measured over the most recent 12 months, like a company's revenue for the last four reported quarters. It gives an up-to-date picture instead of using one calendar year.
Trend — The general direction a price is moving over time: up, down, or sideways. Many traders try to trade in the same direction as the trend rather than fighting it.
Trend Following — A strategy of jumping on established trends and riding them as long as they last, exiting when the trend breaks. It accepts many small losses to catch a few big moves.
Trendline — A straight line drawn on a chart connecting a series of highs or lows. It helps you see the trend and spot where price might bounce or break through.

U

Uncovered (Naked) Option — An option sold without owning protection against it, like selling a call without owning the stock. Losses can be huge or even unlimited, so brokers restrict this and beginners should avoid it.
Underlying — The thing an option or future is based on. For an Apple call option, the underlying is Apple stock; for S&P 500 futures, it is the S&P 500 index.
Underperform — To do worse than a comparison point, usually the overall market. If your stock rose 2% while the S&P 500 rose 8%, your stock underperformed.
Underweight — An analyst's way of saying they expect a stock to do worse than average, so investors might own less of it than usual. The opposite opinion is called overweight.
Underwriter — A bank that helps a company sell new shares to the public, such as during an IPO (a company's first public stock sale). The underwriter organizes the sale and helps set the starting price.
Unlimited Risk — A position where there is no cap on how much money you can lose. Selling stock short or selling a naked call carries unlimited risk because prices can rise without any ceiling.
Unrealized Gain or Loss — The profit or loss on a position you still hold, measured at today's prices. It only becomes real (realized) when you sell and lock it in.
Upside — The potential for a price to rise, or the amount it might gain. If a stock at $40 could reasonably reach $50, traders say it has $10 of upside.
Uptick — A trade that happens at a price slightly higher than the trade just before it. A series of upticks shows buyers are actively pushing price up.
Uptrend — A pattern where prices keep making higher highs and higher lows over time. It is the chart's way of showing buyers are in control.

V

Valuation — The process of estimating what a company or asset is actually worth. Investors compare that estimate to the current price to decide if something looks cheap or expensive.
Value Stock — A stock that looks cheap compared to the company's earnings, assets, or sales. Value investors buy these hoping the market eventually prices them fairly.
Vega — A measure of how much an option's price changes when expected volatility moves by one percentage point. If vega is 0.10, the option gains or loses about $10 per contract for each 1% change in implied volatility.
Vertical Spread — An options trade using two options of the same type and expiration but different strike prices, like buying a $50 call and selling a $55 call. It costs less than a single option and caps both your risk and your reward.
VIX (Volatility Index) — A number that measures how much movement traders expect in the S&P 500 over the next 30 days. It often spikes when fear rises, which is why it is nicknamed the "fear gauge."
Volatility — How much and how fast a price swings around. A stock that moves 5% a day is far more volatile than one that moves 0.5% a day.
Volatility Crush (IV Crush) — A sharp drop in an option's price right after a big expected event, like an earnings report, because the uncertainty is gone. It can hurt option buyers even when the stock moves their way.
Volume — How many shares or contracts changed hands during a period. A stock that trades 10 million shares a day has far more volume than one that trades 10 thousand.
Volume Profile — A chart tool that shows how much trading happened at each price level, not just over time. It highlights prices where buyers and sellers were most active.
VWAP (Volume-Weighted Average Price) — The average price of a stock for the day, weighted so trades with more volume count more. Big institutions compare their fills to VWAP, and many traders use it as a fair-price line on the chart.

W

Wall Street — A street in New York City where the financial industry grew up, now used as a nickname for the entire US financial system: the exchanges, big banks, and funds.
Warrant — A long-term certificate, usually issued by a company, giving the holder the right to buy its stock at a set price before a future date. It works much like a long-dated call option.
Wash Sale — A tax rule: if you sell a stock for a loss and buy a substantially identical one within 30 days before or after that sale (a 61-day window total), the loss is disallowed for taxes for now. This is educational only, not tax advice — talk to a tax professional.
Watchlist — A personal list of stocks or contracts you are keeping an eye on but have not bought. Most traders track a small watchlist instead of the whole market.
Wedge — A chart pattern where price swings get narrower between two slanted lines, squeezing like a wedge. It often shows a move is running out of steam and may reverse or break out.
Weekly Options — Option contracts that expire in about a week, listed with expirations on multiple days each week for popular stocks and indexes. Their short life makes time decay very fast.
Weighting — How much influence each stock has inside an index or fund. In the S&P 500, bigger companies count more, so Apple moving 1% shifts the index far more than a small company moving 1%.
Whipsaw — When price suddenly reverses direction right after moving the other way, trapping traders who just entered. Choppy markets whipsaw traders with repeated small losses.
Working Order — An order you have placed that has not filled yet and is still active, like a limit order waiting for its price. It stays working until it fills, you cancel it, or it expires.
Writer (Option Writer) — The person who sells an option contract and collects the premium. The writer takes on the obligation: a call writer may have to sell shares at the strike price.

Y

Year-over-Year (YoY) — Comparing a number to the same period one year earlier, like this quarter's sales versus the same quarter last year. It removes seasonal effects and shows true growth.
Year-to-Date (YTD) — A measurement from January 1 to today. If a stock is "up 12% YTD," it has gained 12% since the start of the year.
Yield — The income an investment pays you, shown as a percentage of its price. A stock priced at $100 that pays $3 a year in dividends has a dividend yield of 3%.
Yield Curve — A line showing interest rates for bonds of different lengths, from months to 30 years. Normally longer bonds pay more; when short-term rates rise above long-term ones, economists watch closely because it has often preceded recessions.

Z

Zero DTE (0DTE) — Options that expire today, on the same day you trade them ("DTE" means days to expiration). They can move from cheap to worthless in minutes, so they are extremely risky and decay incredibly fast.
Zero-Sum Market — A market where one trader's gain is exactly another trader's loss, like futures and options. For every winner there is a loser on the other side of the trade, before fees.