Trading Glossary

Clear, jargon-free definitions of every trading term you need to know. From stop-loss to gamma exposure — explained simply.

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High-Intent Topics

These pages map to the highest-value search queries in the glossary cluster, so they are a good starting point when you want a quick definition or a deeper guide.

Technical Analysis

RSI (Relative Strength Index)

A momentum oscillator measuring the speed and magnitude of recent price changes on a scale of 0-100.

MACD (Moving Average Convergence Divergence)

A trend-following momentum indicator showing the relationship between two moving averages of a stock's price.

Moving Average

The average price of a stock over a specific period, smoothing out short-term fluctuations to reveal the underlying trend.

ATR (Average True Range)

Average True Range (ATR) is a volatility indicator that measures how much a stock typically moves over a chosen period, including overnight gaps. It does not tell you direction, only the size of the average move. Traders use it to decide how much room a setup needs, where a stop belongs, and whether a ticker is even tradable for the account size and time horizon in front of them.

Support & Resistance

Price levels where buying pressure (support) or selling pressure (resistance) has historically been strong enough to halt or reverse price movement.

Bollinger Bands

A volatility indicator consisting of a moving average and two bands set at standard deviations above and below, showing when price is statistically extreme.

Breakout

When a stock's price moves above a resistance level or below a support level, often signaling the start of a new trend.

Volume

The number of shares traded during a given period. Volume confirms price moves — high volume validates direction, low volume suggests weakness.

Momentum

The rate of acceleration of a stock's price — a measure of how quickly and strongly the price is moving in a given direction.

VWAP (Volume Weighted Average Price)

The average price of a stock weighted by volume throughout the trading day, acting as a benchmark for institutional execution quality.

Overbought / Oversold

Conditions where a stock has moved too far too fast — overbought suggests it may pull back, oversold suggests it may bounce.

Trend Following

A trading approach that identifies and rides sustained directional moves, entering in the direction of the prevailing trend and holding until the trend reverses.

Standard Deviation

A statistical measure of how spread out data points are from the mean — in trading, it quantifies price volatility.

Fibonacci Retracement

A technical analysis tool that uses horizontal lines at key Fibonacci ratios (23.6%, 38.2%, 50%, 61.8%) to identify potential support and resistance levels during pullbacks within a trend.

Candlestick Patterns

Visual price patterns formed by one or more candlesticks on a chart that signal potential reversals or continuations in price direction — the most widely used method for reading price action.

Gap Trading

A strategy that trades stocks which open significantly higher or lower than the previous close, creating a visible "gap" on the chart — one of the most popular day trading setups.

Relative Volume (RVOL)

A metric comparing current trading volume to the stock's average volume for the same time of day, expressed as a multiple (e.g., 2.5x means 2.5 times normal volume).

Scalping

An ultra-short-term trading strategy that aims to profit from small price movements by holding positions for seconds to minutes — the fastest form of active trading.

Moving Average Crossover

A technical signal that occurs when a shorter-period moving average crosses above or below a longer-period moving average, indicating a potential trend change.

Opening Range

The high and low price range established during the first 5-30 minutes of the trading day, used as a reference for breakout strategies.

Consolidation

A period when a stock trades within a defined price range, showing neither a clear uptrend nor downtrend, as buyers and sellers reach a temporary equilibrium.

On-Balance Volume (OBV)

A cumulative volume-based indicator that adds volume on up days and subtracts volume on down days, used to confirm price trends and detect divergences.

Accumulation/Distribution

A volume-weighted indicator that measures the cumulative flow of money into or out of a stock, based on where the price closes within its daily range.

Cup and Handle

A bullish chart pattern resembling a teacup with a handle, where the price forms a rounded bottom (cup) followed by a small downward drift (handle) before breaking out.

Ichimoku Cloud

A comprehensive technical indicator that shows support/resistance, trend direction, momentum, and trading signals all in one chart overlay — developed by Japanese journalist Goichi Hosoda.

Keltner Channel

A volatility-based envelope indicator using an EMA center line with ATR-based upper and lower bands — similar to Bollinger Bands but using ATR instead of standard deviation.

Donchian Channel

A trend-following indicator that plots the highest high and lowest low over a specified period (typically 20 days), forming a channel that identifies breakout levels.

Heikin-Ashi

A modified candlestick charting technique that uses averaged price values to filter out market noise and make trends easier to identify visually.

OHLCV

Open-High-Low-Close-Volume — the five standard data points that describe price action for a trading bar or candle over a specific time period.

MACD Histogram

The visual representation of the difference between the MACD line and its signal line, plotted as bars above or below zero.

Renko Chart

A chart type that uses fixed-size price bricks instead of time-based candles, filtering out minor price movements to highlight clear trends.

Point and Figure Chart

A chart method that plots columns of Xs (rising prices) and Os (falling prices) based on price reversals, completely ignoring time and volume.

Elder Ray Index

A technical indicator created by Dr. Alexander Elder that measures buying and selling pressure using Bull Power and Bear Power relative to an exponential moving average.

Volume Profile

A charting study that displays the total volume traded at each price level over a specified time period, shown as a horizontal histogram alongside the price axis.

Pivot Points

Calculated support and resistance levels derived from the previous period's high, low, and close prices, widely used by floor traders and day traders.

Ichimoku Cloud

A comprehensive technical analysis system that uses five calculated lines and a shaded "cloud" to identify trend direction, momentum, and support/resistance levels in a single glance.

Keltner Channel

A volatility-based envelope indicator that plots bands above and below a central moving average using ATR (Average True Range) multiples, creating a dynamic channel that adapts to market volatility.

Swing Trading

A trading style that holds positions for several days to a few weeks, aiming to capture price "swings" within a larger trend.

Head and Shoulders

A reversal chart pattern consisting of three peaks — a higher middle peak (head) flanked by two lower peaks (shoulders) — signaling a transition from bullish to bearish trend.

Double Top / Double Bottom

Reversal chart patterns where price tests a resistance level twice (double top) or support level twice (double bottom) before reversing direction.

Flag Pattern

A short-term continuation pattern that forms as a small rectangular consolidation (the flag) after a sharp price move (the flagpole), signaling the trend is likely to resume.

Dead Cat Bounce

A brief, temporary recovery in the price of a declining asset before the downtrend resumes, often trapping buyers who mistake it for a genuine reversal.

Gap Fill

When a stock's price moves back to "fill" a price gap — an area on the chart where no trading occurred between the previous close and the next open.

Stochastic Oscillator

A momentum indicator that compares a stock's closing price to its price range over a specified period, generating values between 0 and 100 to identify overbought and oversold conditions.

ADX (Average Directional Index)

A trend strength indicator that measures how strong a trend is regardless of direction, with values ranging from 0 to 100. ADX above 25 indicates a strong trend; below 20 suggests a range-bound market.

Parabolic SAR

A trend-following indicator that places dots above or below price to signal potential reversals and trailing stop levels. SAR stands for "Stop and Reverse."

Money Flow Index (MFI)

A volume-weighted momentum oscillator that measures buying and selling pressure using both price and volume data, often called the "volume-weighted RSI."

EMA (Exponential Moving Average)

A type of moving average that gives more weight to recent prices, making it more responsive to new information than a simple moving average (SMA).

Williams %R

A momentum oscillator ranging from 0 to -100 that measures overbought and oversold levels, similar to the stochastic oscillator but inverted and using only the close relative to the high.

Doji

A candlestick pattern where the open and close prices are nearly equal, forming a cross or plus shape that signals indecision between buyers and sellers.

Hammer Candlestick

A bullish reversal candlestick pattern with a small body near the high and a long lower wick at least twice the body length, indicating buyers rejected lower prices.

Engulfing Pattern

A two-candle reversal pattern where the second candle completely engulfs the body of the first, signaling a potential trend change.

Morning Star / Evening Star

Three-candle reversal patterns. A morning star signals a bullish reversal at the bottom of a downtrend; an evening star signals a bearish reversal at the top of an uptrend.

Ascending Triangle

A bullish continuation chart pattern formed by a flat resistance line and a rising support trendline, indicating buyers are progressively willing to pay higher prices.

Descending Triangle

A bearish continuation chart pattern formed by a flat support line and a declining resistance trendline, indicating sellers are progressively willing to accept lower prices.

Opening Range Breakout (ORB)

A day trading strategy that identifies the high and low price range established during the first 5, 15, or 30 minutes after market open, then enters a trade when price breaks above the high (bullish) or below the low (bearish) of that range.

Gap and Go

A momentum day trading strategy where a stock that gaps up significantly at the open continues moving in the direction of the gap, and traders enter to ride that continuation.

Anchored VWAP

A variation of VWAP (Volume Weighted Average Price) where the calculation begins at a specific user-defined event — such as an earnings release, major news date, or market structure low — rather than the start of the current trading day.

Price Action

A trading methodology that reads raw price movements — candlestick shapes, trend structure, and key price levels — without relying on lagging indicators to generate trade signals.

Inside Bar

A two-candlestick price action pattern where the second bar's high is lower than the first bar's high AND its low is higher than the first bar's low — the second candle's entire range is contained within the first candle's range.

Stock Screener

A tool that filters thousands of stocks in real time using programmable criteria — volume, ATR percentage, gap size, relative volume, RSI range, float, and more — to surface a short list of candidates that meet a trader's specific setup requirements.

Relative Strength

A measure of how a stock's price performance compares to a benchmark — typically the S&P 500 — over a defined period. Stocks with high relative strength are outperforming the market; stocks with low relative strength are underperforming. Not to be confused with the RSI (Relative Strength Index), which measures a stock's momentum against its own recent price history.

Float Rotation

A day trading phenomenon where the total volume traded in a stock during a single session equals or exceeds the stock's float (the number of shares available for public trading). Float rotation signals extreme momentum — every available share has effectively changed hands, often multiple times — indicating intense short-term speculation and potential for large price swings.

Momentum Exhaustion

The condition in which a trending price move has depleted buying or selling pressure to the point that the trend can no longer sustain itself — characterized by declining participation, widening spreads, and diminishing price progress per unit of volume, typically preceding a reversal or extended consolidation.

Trade Setup

A specific combination of technical, fundamental, or quantitative conditions that signals a high-probability trade opportunity with a defined entry, stop-loss, and profit target before the position is opened.

Relative Volume (RVOL)

The ratio of a stock's current trading volume to its historical average volume for the same time period, used to identify unusually active stocks that are more likely to make significant price moves.

Options Trading

Implied Volatility (IV)

The market's expectation of future price movement, derived from options prices. Higher IV = larger expected moves.

IV Rank

A percentile measure (0-100) showing where current implied volatility sits relative to its range over the past year.

IV Crush

The rapid decline in implied volatility — and therefore option premiums — after a major event like earnings, causing options to lose value even when you correctly predicted the stock's direction.

Gamma Exposure (GEX)

The aggregate gamma positioning of options market makers, which influences how they hedge and whether they amplify or dampen stock price moves.

Options Greeks

A set of risk measures (Delta, Gamma, Theta, Vega, Rho) that describe how an option's price changes relative to various factors.

Iron Condor

A neutral options strategy combining a bull put spread and bear call spread to profit from low volatility and time decay.

Straddle

An options strategy involving buying both a call and a put at the same strike price, profiting from a large move in either direction.

Strangle

An options strategy involving buying a call and a put at different strike prices, profiting from a large move in either direction at a lower cost than a straddle.

Theta (Time Decay)

The rate at which an option loses value each day due to the passage of time, all else being equal.

Vega (Volatility Sensitivity)

The measure of how much an option's price changes for every 1% change in implied volatility.

Max Pain

The strike price at which the total value of all outstanding options (puts and calls) would expire worthless, causing maximum loss to option holders.

Credit Spread

An options strategy that sells a higher-premium option and buys a lower-premium option at a different strike, collecting net credit upfront.

Options Flow

Real-time tracking of large or unusual options transactions that may indicate informed institutional positioning and provide directional clues about a stock's near-term movement.

Earnings Play

A trade structured around a company's quarterly earnings announcement, designed to profit from the resulting price move or volatility change.

Options Expiration (OpEx)

The date on which an options contract expires and ceases to exist — the holder must exercise, sell, or let it expire worthless.

Open Interest

The total number of outstanding options contracts that have been opened and not yet closed, exercised, or expired.

Pin Risk

The risk that an options position settles unpredictably when the underlying stock closes very near a strike price at expiration.

Volatility Skew

The uneven shape of implied volatility across strikes and expirations, showing that some options are priced richer than others.

Implied Move

The price range options are pricing in for a stock over a specific period, usually calculated from the at-the-money straddle.

Butterfly Spread

A neutral options strategy combining bull and bear spreads with three strike prices, profiting when the stock stays near the middle strike at expiration.

Debit Spread

An options strategy that involves simultaneously buying and selling options at different strikes, where the net cost (debit) is paid upfront — both risk and reward are capped.

Assignment Risk

The risk that an options seller is forced to fulfill the contract obligation — buying or selling 100 shares at the strike price — when the option buyer exercises their right.

Options Chain

A tabular display of all available option contracts for a given stock, organized by expiration date, strike price, and type (call/put).

Gamma Scalping

An advanced options strategy that profits from stock price movement by continually rebalancing a delta-neutral portfolio of options and shares.

IV Percentile

The percentage of days over the past year that implied volatility was lower than its current level — indicating how expensive options are relative to their recent history.

Early Exercise

Exercising an American-style option before its expiration date, converting it into the underlying stock position.

Covered Call

An options strategy where you sell a call option against shares you already own, collecting premium income in exchange for capping your upside at the strike price.

Cash-Secured Put

An options strategy where you sell a put option while holding enough cash to buy the underlying stock if assigned, collecting premium while potentially acquiring shares at a discount.

Calendar Spread

An options strategy involving the simultaneous purchase and sale of options with the same strike price but different expiration dates, profiting from time decay differential.

Protective Put

An options strategy where an investor who owns shares buys a put option on the same stock to limit downside risk — essentially portfolio insurance that caps the maximum loss while preserving unlimited upside.

Options Strategy

A defined plan for trading options contracts that specifies which options to buy or sell, when to enter and exit, and how the position profits from moves in the underlying stock, time decay, or volatility changes.

Call Option

A contract that gives the buyer the right — but not the obligation — to purchase 100 shares of a stock at a specified strike price before the expiration date.

Put Option

A contract that gives the buyer the right — but not the obligation — to sell 100 shares of a stock at a specified strike price before the expiration date.

Butterfly Spread

A neutral options strategy using three strike prices that profits when the underlying stock stays near the middle strike at expiration, with limited risk and limited reward.

Options Chain

A tabular display of all available option contracts for a given stock, organized by expiration date and strike price, showing key data including bid, ask, volume, open interest, and implied volatility for each contract.

Assignment Risk

The risk that the seller (writer) of an option is obligated to fulfill the contract — buying or selling 100 shares at the strike price — when the option buyer exercises their right, most commonly occurring when a short option is in-the-money near expiration.

Collar (Options)

A protective options strategy that combines owning stock with a protective put and a covered call, creating a floor and ceiling on potential gains and losses.

Vertical Spread

An options strategy using two options of the same type and expiration at different strike prices, creating a position with limited risk and limited reward.

Bull Call Spread

A bullish options strategy that buys a call option at a lower strike and sells a call at a higher strike, both with the same expiration, to profit from a moderate stock price increase with limited risk.

Bear Put Spread

A bearish options strategy that buys a put at a higher strike and sells a put at a lower strike, both with the same expiration, to profit from a moderate stock price decline with limited risk.

Diagonal Spread

An options strategy combining different strike prices and different expiration dates, blending the characteristics of vertical spreads and calendar spreads for directional, time-decay, or volatility trades.

LEAPS (Long-Term Equity Anticipation Securities)

LEAPS are options contracts with expiration dates more than one year in the future, giving the holder long-term directional exposure to a stock or index at a fraction of the share price.

Naked Option

An options position sold without holding the underlying stock or an offsetting option, exposing the seller to theoretically unlimited risk on calls and substantial risk on puts.

Weekly Options (Weeklys)

Options contracts that expire every week (typically on Fridays) rather than on the traditional monthly expiration cycle, allowing shorter-duration strategies and more precise timing.

Risk Management

Stop-Loss

A predetermined price level at which a trade is automatically closed to limit losses.

Risk/Reward Ratio

The ratio of potential loss (risk) to potential gain (reward) on a trade, expressed as R:R or 1:X — used to determine whether the expected reward justifies the risk before entering any position.

Position Sizing

The calculation of how many shares or contracts to buy or sell on a given trade, based on account size, risk tolerance, and the trade's stop-loss distance — ensuring no single trade can cause disproportionate damage to your account.

Take Profit

A predetermined price level at which a profitable trade is closed to lock in gains.

Trailing Stop

A dynamic stop-loss that moves up with the stock price, locking in profits as the trade moves in your favor while still protecting against reversals.

Expected Value (EV)

The probability-weighted average outcome of a trade over many repetitions: EV = (Win% x Avg Win) - (Loss% x Avg Loss).

PDT Rule (Pattern Day Trader)

A FINRA regulation requiring traders who execute 4 or more day trades in 5 business days to maintain a minimum $25,000 account balance to continue day trading.

Exit Strategy

A predefined plan for closing a trade, whether at a profit target, stop-loss, or based on changing market conditions.

Win Rate

The percentage of trades that are profitable out of total trades taken.

Day Trading

A trading style where all positions are opened and closed within the same trading day, with no overnight holdings.

Margin Trading

Trading with borrowed money from your broker, using your existing securities as collateral to amplify buying power.

Paper Trading

Paper trading is simulated trading with virtual money in a live market environment. Traders use it to practice order entry, test strategies, and validate process before risking real capital. The strongest paper trading workflow mirrors your live workflow closely: same risk, same order types, same journal, and the same review standards.

Drawdown

The peak-to-trough decline in a portfolio's value before a new high is reached, expressed as a percentage from the peak.

Sortino Ratio

A risk-adjusted performance metric similar to the Sharpe ratio, but only penalizes downside volatility — upside volatility is considered beneficial, not risky.

Max Drawdown

The largest peak-to-trough decline in portfolio value before a new high is reached — the worst-case loss you would have experienced during a given period.

Value at Risk (VaR)

A statistical measure estimating the maximum potential loss of a portfolio over a given time period at a specific confidence level.

Calmar Ratio

A risk-adjusted return metric that divides annualized return by maximum drawdown — measuring how much return a strategy generates per unit of worst-case loss.

Information Ratio

A measure of risk-adjusted excess return relative to a benchmark, calculated as active return divided by tracking error.

Tracking Error

The standard deviation of the difference between a portfolio's returns and its benchmark's returns — measuring how closely a strategy follows or deviates from its benchmark.

Risk-Adjusted Return

A measure of investment return that accounts for the amount of risk taken to achieve it, allowing fair comparison between strategies with different risk profiles.

Profit Factor

The ratio of gross profits to gross losses in a trading system. A profit factor above 1.0 means the system is profitable; below 1.0 means it loses money.

Expectancy

The average amount you expect to win (or lose) per trade over many repetitions. Positive expectancy means a trading system is profitable over time.

Risk of Ruin

The probability that a trader will lose enough capital to be unable to continue trading, often defined as losing a specific percentage (e.g., 50%) of the starting account.

Whipsaw

A rapid price reversal that triggers a stop-loss or trade entry immediately before the price moves back in the original direction, resulting in a loss on what would have been a profitable trade.

Margin Call

A demand from your broker to deposit additional funds or sell positions when your account equity falls below the required maintenance margin, typically 25% of the total position value.

Wash Sale Rule

An IRS rule that disallows claiming a tax loss on a security if you buy a "substantially identical" security within 30 days before or after the sale.

Leverage

Using borrowed capital or financial instruments to amplify both potential gains and losses, allowing traders to control larger positions than their account balance would normally allow.

Breakeven Stop

Moving your stop-loss to your entry price once a trade has gained enough profit, so the position can no longer result in a cash loss.

R-Multiple

A normalized measure of trade outcome expressed as multiples of the initial risk (R), where 1R equals the amount risked on entry.

Time-Decay Exit

An exit rule that closes a trade after a maximum holding period has elapsed, regardless of profit or loss, to prevent capital from being tied up in stalled positions.

Trailing Stop Ratchet

A mechanism that moves the trailing stop upward in discrete steps as a position gains profit — locking in progressively more of the move without ever allowing the stop to retreat.

Breakeven Floor

The minimum profit threshold a position must reach before the stop-loss is moved to the entry price — the "floor" that gates the breakeven stop activation.

Never-Profitable Guard

An early-exit rule that closes a position if it has been open for a minimum time period and never once went into profit — indicating the trade thesis failed from the outset.

Flat Exit

Closing a trade that has shown no meaningful price movement after entry — exiting a position stuck near the entry price to free capital for better opportunities.

EOD Flatten (End-of-Day Flatten)

The automatic closure of all open intraday positions before market close to eliminate overnight gap risk and ensure flat positioning at the end of the trading session.

ATR-Based Stops

A stop-loss placement methodology that uses Average True Range (ATR) — a measure of a stock's typical daily price movement — to set stops at a statistically meaningful distance from entry.

Daily Loss Limit

A pre-set maximum dollar amount or percentage of account equity that a trader will allow themselves to lose in a single trading day, after which all trading stops regardless of perceived opportunity.

Overnight Gap Risk

The risk that a security's price opens significantly higher or lower than its previous closing price due to news, earnings, or market events that occur while the exchange is closed, creating a gap that bypasses stop-loss orders set at the closing price.

Partial Profit Taking

The exit technique of closing a portion of an open position — typically 25–50% of shares — when price reaches a profit target, while keeping the remainder open with a trailing stop to capture additional upside if the move continues.

Concentration Risk

The risk of outsized portfolio losses from excessive exposure to a single stock, sector, correlated asset group, or trading strategy. When concentrated positions move adversely together, losses compound beyond what normal position sizing would predict.

Chandelier Exit

A volatility-based trailing stop methodology that anchors the stop at a fixed ATR multiple below the highest high (or above the lowest low for shorts) reached since trade entry, ensuring the stop only moves in the direction of the trade as new extremes are set.

Trade Journal

A systematic record of every trade taken, documenting entry and exit data, setup rationale, MFE/MAE statistics, market conditions, and post-trade reflections — used to identify behavioral patterns, improve strategy execution, and build an evidence base for continuous performance improvement.

Circuit Breaker (Trading System)

An internal risk control mechanism in algorithmic and automated trading systems that automatically halts all new trade entries when predefined loss thresholds, drawdown limits, or error conditions are triggered — preventing a cascade of losses from compounding during system malfunctions or adverse market conditions.

Monk Mode (Trading)

A conservative risk state in an automated trading system that blocks all new trade entries during unfavorable market conditions — such as adverse macro regimes, post-loss recovery periods, pre-earnings volatility windows, or operator-defined quiet hours — protecting capital by choosing disciplined inactivity over forced participation.

Scale-Out (Position)

A trade management technique where a trader exits a profitable position in multiple tranches at different price levels rather than closing the entire position at once — locking in partial gains while allowing a remaining portion to continue running toward a larger target.

Exit Trigger

A specific, pre-defined condition or event that causes an automated or rules-based trading system to close or reduce an open position — replacing vague, emotion-driven exit decisions with quantified criteria that fire consistently regardless of how the trader feels about the trade.

Regime-Adaptive Sizing

A position sizing methodology that adjusts trade size based on the current market regime — reducing exposure during high-volatility, trending, or transitioning regimes and increasing it during calm, range-bound regimes where edge is statistically higher.

Risk Management

The systematic process of identifying, measuring, and controlling the financial risks in a trading portfolio — including position-level stops, portfolio-level heat limits, daily loss caps, and drawdown rules.

Buying Power

The total amount of capital available to open new positions in a trading account, including both settled cash and any margin credit extended by the broker.

Hedging

Hedging is an investment strategy that reduces or offsets the risk of an existing position by taking an opposing position in a related asset. It acts as financial insurance — you accept a small known cost to protect against a larger unknown loss.

Market Structure

Dark Pool

A private exchange where large institutional orders are executed without being visible to the public market before the trade is complete.

VIX (Volatility Index)

The CBOE Volatility Index measuring the market's expectation of 30-day forward-looking volatility, derived from S&P 500 options prices.

Fear & Greed Index

The Fear & Greed Index is a market sentiment gauge that blends several indicators into a single 0-100 reading to show whether investors are acting fearfully or greedily. It is best used as a contrarian context tool rather than a precise buy or sell trigger. Traders use it to understand whether the market is pricing in panic, complacency, or something in between before they size a new position.

Market Maker

A firm or individual that continuously provides buy and sell quotes for a security, profiting from the bid-ask spread while ensuring market liquidity.

Block Trade

A large privately negotiated securities transaction, typically 10,000+ shares or $200,000+, executed outside the public exchange.

Sentiment Analysis

The use of natural language processing, data analysis, and quantitative market indicators to gauge market participants' emotions and opinions about a stock or the broader market.

Short Selling

Selling borrowed shares with the expectation of buying them back at a lower price, profiting from a stock's decline — the primary way traders make money in falling markets.

Pre-Market Trading

Trading that occurs before the regular market session (4:00 AM - 9:30 AM ET), typically with lower volume and wider spreads.

After-Hours Trading

Trading that occurs after the regular market close (4:00 PM - 8:00 PM ET), often driven by earnings releases and after-hours news.

Bull Market

A sustained period where stock prices are rising or expected to rise, typically defined as a 20%+ gain from recent lows.

Bear Market

A sustained period where stock prices fall 20% or more from recent highs, accompanied by widespread pessimism and negative investor sentiment.

Put/Call Ratio

A sentiment indicator that compares the volume of put options traded to call options traded, used to gauge overall market sentiment.

Float

The number of a company's shares that are available for public trading, excluding shares held by insiders, institutions with restricted stock, and other locked-up shares.

Liquidity

The ease with which a stock or asset can be bought or sold without significantly affecting its price.

Bid-Ask Spread

The difference between the highest price a buyer is willing to pay (bid) and the lowest price a seller is willing to accept (ask) for a security.

Market Breadth

A measure of how many stocks are participating in a market move, used to assess the health and sustainability of a trend.

Order Flow

The real-time stream of buy and sell orders entering the market, revealing the actual supply and demand dynamics behind price movement.

Level 2 Market Data

A real-time display of all pending buy and sell limit orders at every price level for a given stock — showing the full depth of the order book.

NBBO (National Best Bid and Offer)

The best displayed bid and ask across U.S. exchanges at a given moment, used as the reference point for fair execution and quote protection.

Staking

Locking up cryptocurrency in a blockchain network to support its operations (validation, security) in exchange for reward payments.

Proof of Stake (PoS)

A blockchain consensus mechanism where validators are chosen to create new blocks based on the amount of cryptocurrency they have staked as collateral, rather than computational power.

DeFi (Decentralized Finance)

A category of financial applications built on blockchain networks that operate without traditional intermediaries like banks, brokers, or exchanges.

Gas Fees

Transaction fees paid to blockchain validators for processing and confirming transactions on networks like Ethereum.

Yield Farming

A DeFi strategy of moving crypto assets between protocols to maximize returns through lending interest, trading fees, and token incentive rewards.

Liquidity Pool

A smart contract holding paired crypto assets that enables decentralized trading by letting users swap tokens without a traditional order book.

Market Microstructure

The study of how exchanges, order types, and market participants interact to determine prices — the mechanics of how trades actually get executed.

Tick Data

The most granular market data available — a record of every individual trade or quote update, timestamped to the microsecond.

MEV (Maximal Extractable Value)

The maximum profit a block producer can capture by reordering, inserting, or censoring transactions within a block they produce.

Impermanent Loss

The unrealized loss that liquidity providers experience when the price ratio of their deposited token pair diverges from the ratio at deposit time.

Validator

A node operator on a proof-of-stake blockchain that proposes and attests to new blocks in exchange for staking rewards.

SIP Feed (Securities Information Processor)

The consolidated data feed that aggregates quotes and trades from all US stock exchanges into a single national best bid/offer (NBBO) stream.

Time and Sales

A real-time record of every executed trade for a security, showing the exact time, price, volume, and exchange for each transaction.

Smart Order Routing (SOR)

An automated system that scans multiple trading venues to find the best available price and liquidity for order execution.

Payment for Order Flow (PFOF)

A practice where brokers receive compensation from market makers for routing customer orders to them for execution instead of to public exchanges.

Order Book

A real-time electronic ledger displaying all outstanding buy and sell orders for a security, organized by price level, showing the depth of available liquidity.

Market Depth

A measure of the volume of open buy and sell orders at various price levels for a security, indicating how much trading activity the market can absorb without significantly moving the price.

Tape Reading

The practice of analyzing the time and sales feed (the "tape") to interpret real-time order flow, trade size, and execution speed to gauge buying and selling pressure.

Circuit Breaker (Market)

Automatic trading halts triggered when a major index (typically the S&P 500) drops by a specific percentage in a single trading session, designed to prevent panic selling.

Market Impact

The price change caused by your own order entering the market — larger orders move the price against you because they consume available liquidity at each price level.

Algorithmic Execution

Using computer algorithms to break large orders into smaller pieces and execute them over time to minimize market impact and reduce execution costs.

Average Daily Volume (ADV)

The average number of shares traded per day over a specified period, typically 20 or 50 trading days. A key measure of a security's liquidity.

Institutional Ownership

The percentage of a company's outstanding shares held by institutional investors (mutual funds, pension funds, hedge funds), reported quarterly in 13F filings with the SEC.

Float (Stock Float)

The number of shares of a company's stock that are available for public trading, calculated by subtracting insider-owned shares, restricted shares, and other locked-up shares from total shares outstanding.

Wyckoff Method

A technical analysis framework developed by Richard Wyckoff in the 1930s that explains how large institutional operators accumulate and distribute positions across market cycles — and how retail traders can identify these phases to trade alongside smart money.

Stock Catalyst

An event, announcement, or piece of new information that causes a material change in investor expectations and drives a stock's price to move significantly in a short period.

Float (Stock Float)

The number of shares of a publicly traded company that are available for trading by the general public, excluding restricted shares, insider holdings, and treasury stock.

Short Squeeze

A rapid, self-reinforcing price surge that occurs when short sellers are forced to buy back shares to cover their positions, adding buying pressure on an already rising stock.

Post-Earnings Drift (PEAD)

The tendency for a stock's price to continue moving in the direction of an earnings surprise for days or weeks after the initial earnings reaction, rather than immediately reflecting the full impact of the news.

Days to Cover (Short Ratio)

The number of average trading days it would take for all short sellers in a stock to buy back their borrowed shares and close their positions at the current average daily volume.

Smart Contract

A self-executing program stored on a blockchain that automatically enforces the terms of an agreement when predefined conditions are met, without needing a central authority or intermediary.

DEX (Decentralized Exchange)

A cryptocurrency exchange that operates without a central authority, using smart contracts to enable peer-to-peer token trading directly from users' wallets.

Airdrop (Crypto)

A distribution of free cryptocurrency tokens to wallet addresses, typically used by projects to reward early users, bootstrap a community, or decentralize token ownership.

Layer 2 (L2)

A scaling solution built on top of a base blockchain (Layer 1) that processes transactions off the main chain to increase throughput and reduce fees while inheriting the security of the underlying network.

Tokenomics

The economic design of a cryptocurrency token — including supply mechanics, distribution, utility, incentive structures, and governance rights — that determines its long-term value accrual and sustainability.

Fundamental Analysis

Earnings Per Share (EPS)

A company's net profit divided by its number of outstanding shares — the most widely used measure of corporate profitability.

P/E Ratio (Price-to-Earnings)

The ratio of a stock's price to its earnings per share — a widely used valuation metric showing how much investors pay per dollar of earnings.

Market Capitalization

The total market value of a company's outstanding shares — calculated by multiplying the stock price by the number of shares outstanding.

Revenue Growth

The percentage increase in a company's total sales compared to a prior period — a key indicator of business momentum and market demand.

Dividend Yield

The annual dividend payment divided by the stock price, expressed as a percentage — showing the income return from owning a stock.

Short Interest

The total number of shares currently sold short and not yet covered — a measure of bearish sentiment on a stock.

Earnings Surprise

The difference between a company's reported earnings per share (EPS) and the consensus analyst estimate, expressed as a percentage beat or miss.

Free Cash Flow (FCF)

The cash a company generates from operations after deducting capital expenditures, representing the money available for dividends, buybacks, debt repayment, or reinvestment.

Return on Equity (ROE)

A profitability metric that measures how effectively a company uses shareholders' equity to generate profits, calculated as Net Income divided by Shareholders' Equity.

Debt-to-Equity Ratio

A financial leverage metric comparing a company's total liabilities to shareholders' equity, indicating how much the business relies on debt versus equity financing.

Enterprise Value (EV)

The total value of a company including market capitalization, debt, minority interest, and preferred shares, minus cash — representing the theoretical takeover price.

PEG Ratio

The price/earnings-to-growth ratio divides a stock's P/E ratio by its earnings growth rate, providing a growth-adjusted valuation metric. A PEG below 1.0 suggests undervaluation relative to growth.

AI & Quantitative

Market Regime

The current dominant state of the market — trending (bull/bear), range-bound, or high-volatility — that determines which trading strategies work best.

Kelly Criterion

A mathematical formula for determining the optimal bet size based on edge (win probability and payoff ratio) to maximize long-term growth.

Cointegration

A statistical relationship where two time series share a long-run equilibrium — even if they wander apart short-term, they tend to revert to a stable relationship.

Mean Reversion

The theory that prices tend to return to their average over time — extreme moves up or down are followed by a move back toward the mean.

Pairs Trade

A market-neutral strategy that simultaneously buys one stock and shorts a correlated stock, profiting from the convergence of their spread.

Statistical Arbitrage

A quantitative trading strategy that exploits short-term mispricings identified through statistical models, typically across a portfolio of related securities.

Half-Life (Mean Reversion)

The estimated time it takes for a spread or price deviation to revert halfway back to its mean — a measure of how quickly mean reversion occurs.

Historical Volatility (HV)

The actual measured volatility of a stock over a past period, calculated from historical price data — as opposed to implied volatility which is forward-looking.

Beta

A measure of a stock's volatility relative to the overall market, where a beta of 1.0 means the stock moves in line with the market.

Alpha

The excess return of an investment relative to a benchmark index, representing the value added (or lost) by active management or a trading strategy.

Sharpe Ratio

A measure of risk-adjusted return that divides a portfolio's excess return (above the risk-free rate) by its standard deviation of returns.

Correlation

A statistical measure ranging from -1 to +1 that describes how closely two assets' price movements are related to each other.

Backtesting

The process of testing a trading strategy on historical market data to evaluate how it would have performed before risking real capital.

Walk-Forward Analysis

A validation technique that tests a trading strategy on rolling out-of-sample periods to confirm it works beyond the data it was optimized on.

Overfitting

When a trading strategy is too closely tuned to historical data, capturing noise and random patterns rather than genuine market signals — causing it to fail in live trading.

R-Squared

A statistical measure (0 to 1) indicating how closely an investment's returns correlate with a benchmark index — higher values mean the portfolio moves more in lockstep with the benchmark.

Transaction Cost Analysis (TCA)

A framework for measuring and evaluating the total costs of executing trades — including commissions, spreads, slippage, and market impact — relative to benchmarks.

Survivorship Bias

A statistical error in backtesting that occurs when only stocks that survived (still exist today) are included in the dataset, ignoring delisted, bankrupt, or merged companies.

Look-Ahead Bias

A backtesting error where the strategy uses information that would not have been available at the time of the trade — essentially "cheating" by peeking at future data.

Walk-Forward Analysis

A rigorous backtesting methodology that tests a trading strategy on sequential out-of-sample data periods, preventing curve-fitting and providing a realistic estimate of future performance.

TWAP (Time-Weighted Average Price)

An execution algorithm that splits a large order into equal-sized slices and executes them at regular time intervals to achieve the average price over a period.

Latency Arbitrage

A trading strategy that exploits speed differences between venues to profit from stale prices before they update across all exchanges.

Co-Location

The practice of placing trading servers physically inside or directly adjacent to exchange data centers to minimize network latency.

High-Frequency Trading (HFT)

Automated trading that uses powerful computers and algorithms to execute a very large number of orders at extremely high speeds, typically holding positions for seconds or less.

Monte Carlo Simulation

A computational technique that runs thousands of randomized scenarios using historical data to model the range of possible outcomes for a trading strategy or portfolio.

Regime Detection

The statistical identification of distinct market states or "regimes" — such as trending, mean-reverting, or volatile — to adapt trading strategy selection and risk parameters in real time.

MFE (Maximum Favorable Excursion)

The highest unrealized profit a trade reaches between entry and exit — the best the position ever looked on paper.

MAE (Maximum Adverse Excursion)

The largest unrealized loss a trade experiences between entry and exit — the worst the position ever looked on paper.

Capture Ratio

The percentage of a trade's maximum favorable excursion (MFE) that was actually realized as profit upon exit.

Dynamic Exit Engine

An ML-driven system that continuously adjusts stop-loss levels, take-profit targets, and trailing distances in real-time based on market conditions, momentum signals, and trade-specific data.

Conviction Scoring

An AI-generated 0–100 score assigned to each trade candidate that reflects the system's confidence in the trade setup, integrating technical signals, market context, sentiment, and historical performance data.

Signal Quality Classification

An ML-based system that evaluates each trade signal on a 5-tier scale (A through E) based on historical performance of similar setups, providing an additional quality filter beyond raw technical criteria.

Composite Score

A single numeric score that combines multiple evaluation factors — technical strength, volume, gap, relative strength, watchlist priority, and AI conviction — to rank day trade candidates from best to worst before execution.

Intraday Regime

A real-time classification of current intraday market conditions — typically "trending" or "choppy" — derived from short-term price efficiency metrics on an index proxy (e.g., SPY 5-minute bars).

Efficiency Ratio (ER)

Kaufman's Efficiency Ratio measures how efficiently price moves in one direction, expressed as a value between 0 (completely random/choppy) and 1 (perfectly trending).

Thompson Sampling

A Bayesian probability-matching algorithm that balances exploration of uncertain options with exploitation of known winners, commonly used in multi-armed bandit problems and adaptive trading strategy selection.

Multi-Agent AI Trading

A trading analysis architecture where multiple independent AI agents debate a trade from opposing perspectives (bull vs. bear), producing more balanced conviction scores and reducing single-model bias.

Sharpe Ratio

A measure of risk-adjusted return that compares the excess return of a portfolio or strategy above the risk-free rate to its standard deviation of returns, indicating how much return is earned per unit of volatility.

MFE / MAE (Maximum Favorable / Adverse Excursion)

MFE (Maximum Favorable Excursion) is the largest unrealized profit a trade reached before closing; MAE (Maximum Adverse Excursion) is the largest unrealized loss. Together they measure trade quality independent of final outcome.

Market Regime Detection

The process of identifying the current macroeconomic or technical state of the market — such as trending, mean-reverting, or high-volatility — to adapt trading strategies to the prevailing conditions.

Walk-Forward Optimization

A backtesting methodology that repeatedly optimizes strategy parameters on a historical "in-sample" window, then tests those parameters on the immediately following "out-of-sample" period — simulating how a strategy would actually have been deployed in real time.

Autonomous Trading Agent

A self-directed AI system that monitors markets, generates trade signals, manages risk, executes orders, and learns from outcomes — all without requiring human input on each trade.

Reinforcement Learning in Trading

A machine learning approach where an AI agent learns optimal trading decisions by receiving reward signals (profits) and penalty signals (losses) through trial and error, without being explicitly programmed with fixed rules.

Self-Improving Trading System

An AI trading system that automatically analyzes its own performance, extracts lessons from wins and losses, and uses those insights to improve future trading decisions — without manual reconfiguration.

Volatility Targeting

A position sizing technique that scales exposure inversely with realized volatility to maintain a constant target level of portfolio risk — increasing position size in calm, low-volatility markets and reducing it in volatile, high-risk environments.

Regime Filter

A rule or set of rules applied as a pre-condition before evaluating trade entries, designed to prevent strategy-regime mismatches by only allowing signals to be acted upon when the prevailing market environment is historically favorable for that strategy type.

Dynamic Exit Engine

A machine learning system that adjusts stop-loss and profit-target levels in real time during an open trade based on price momentum, volatility, time elapsed, MFE/MAE statistics, and market regime — replacing fixed stop-target pairs with adaptive exit management that responds to evolving trade conditions.

MFE/MAE Ratio

A trade quality metric that divides a trade's Maximum Favorable Excursion (the furthest the trade moved in your favor) by its Maximum Adverse Excursion (the furthest it moved against you), producing a single number that measures how cleanly a trade worked relative to how rough the ride was.

Vol-Regime Mean Reversion

A mean reversion strategy that only enters trades when volatility regime analysis confirms a range-bound, low-momentum environment — filtering out false reversal signals that appear during trending markets.

Momentum Velocity

The rate of change of price momentum — measuring not just the direction of a move but how fast it is accelerating or decelerating, used to detect momentum exhaustion before price reverses.

Velocity Decay

The progressive deceleration of price momentum — where the rate of change of a move slows down while price may still be advancing — indicating that a trend is losing energy and a reversal or stall is approaching.

Mean Reversion Entry Signal

A buy or sell trigger generated when price has deviated significantly from a statistical mean and market conditions confirm that a snap-back is likely — combining an extreme reading from an oscillator or band with a regime filter that verifies range-bound conditions.

Vol-Regime Switching

The process by which a trading system detects a shift in the prevailing volatility regime — from low-volatility range-bound conditions to high-volatility trending conditions, or vice versa — and automatically reallocates strategy weights, position sizes, and signal filters to match the new environment.

Algorithmic Trading

The use of computer programs and mathematical rules to automatically execute trades at speeds and frequencies impossible for human traders — eliminating emotion and enforcing consistency.

Quantitative Trading

A trading approach that uses mathematical models, statistical analysis, and computer algorithms to identify opportunities and execute trades — removing subjective human judgment from the decision-making process.

Trading Bot

Software that automatically executes buy and sell orders in financial markets according to a predefined strategy — operating without manual intervention, 24/7 or during defined trading hours.

Automated Trading

A method of executing trades using software programs that monitor markets, generate signals, and submit orders automatically — without requiring a human to manually place each trade.

AI Trading Bot

A software program that uses artificial intelligence and machine learning to automatically analyze markets, generate trading signals, manage risk, and execute trades — without manual human intervention.

Order Types

Market Order

An order to buy or sell a security immediately at the best available current price.

Limit Order

An order to buy or sell a security at a specific price or better — it guarantees price but not execution.

Stop Order

A stop order is an order that becomes a market order once price reaches a specified trigger level. Traders use it primarily to cap losses, but it can also be used to enter breakouts when price confirms through a key level. The tradeoff is certainty of exit, not certainty of price, which is why stop orders are most useful when you need the market to act even if the fill is not perfect.

Stop-Limit Order

An order that becomes a limit order (instead of a market order) once the stock reaches a specified trigger price — combining stop and limit functionality.

Slippage

The difference between the expected price of a trade and the actual price at which it is executed.

Time-in-Force

An instruction attached to an order that specifies how long the order remains active before it is executed or automatically canceled.

Bracket Order

A three-part order that simultaneously places an entry order with an attached profit target (limit) and stop-loss order, automatically managing the trade from entry to exit.

OCO (One-Cancels-Other) Order

A pair of linked orders where the execution of one automatically cancels the other, commonly used to set both a take-profit and stop-loss simultaneously.

GTC (Good-Till-Cancelled)

A time-in-force instruction that keeps an order working until it is filled, canceled, or expired by the broker's order-management rules.

Fill or Kill (FOK)

A time-in-force instruction that requires the entire order to be executed immediately in full, or the order is canceled entirely — no partial fills allowed.

TWAP (Time-Weighted Average Price)

An algorithmic order execution benchmark calculated by dividing the sum of all transaction prices by the number of transactions over a specified time period, treating each trade equally regardless of size.

Portfolio Management

Diversification

Spreading capital across multiple assets, sectors, or strategies to reduce the impact of any single loss on the overall portfolio.

Portfolio Heat

The total percentage of portfolio capital at risk across all open positions — a measure of aggregate portfolio risk.

Asset Allocation

The strategic distribution of capital across different asset classes (stocks, bonds, options, crypto, cash) based on goals and risk tolerance.

Rebalancing

The process of readjusting portfolio weights back to target allocations by selling overweight positions and buying underweight ones.

Dollar-Cost Averaging (DCA)

An investment strategy of buying a fixed dollar amount of a security at regular intervals, regardless of price, to reduce the impact of volatility.

Compound Interest

The process of earning returns on both your initial investment and on previously accumulated returns, creating exponential growth over time.

Sector ETF

An exchange-traded fund that tracks a specific sector of the economy, such as technology, healthcare, energy, or financials.

Sector Rotation

An investment strategy that moves capital between stock market sectors based on the current phase of the economic cycle, aiming to outperform by being in sectors that benefit from prevailing conditions.

Risk Parity

A portfolio construction approach that allocates capital based on each asset's risk contribution rather than dollar value, so every position contributes equally to overall portfolio risk.

Tax-Loss Harvesting

The strategy of selling losing positions to realize capital losses that offset capital gains, reducing your tax liability while maintaining market exposure through substitute positions.

Cost Basis

The original value of an investment including purchase price and associated costs (commissions, fees), used to calculate capital gains or losses for tax purposes.

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