A comprehensive A-Z reference of options trading terminology used across the Ainvest platform. Designed for retail traders from beginner to intermediate level.
A
Ask
The lowest price at which a seller is willing to sell an option contract. The ask price, along with the bid price, determines the spread -- a narrower spread typically indicates higher liquidity.
On Ainvest: Displayed in the Option Chain on both web and mobile platforms.
At The Money (ATM)
An option whose strike price is equal to, or very close to, the current market price of the underlying asset. ATM options have the highest time value and are often the most actively traded contracts at a given expiration.
On Ainvest: The Option Chain highlights the ATM strike, making it easy to identify the most relevant contracts for the current price level.
B
Bearish
A market outlook expecting the price of an asset to decline. Bearish options strategies include buying puts, selling calls, or constructing spreads that profit from downward price movement.
On Ainvest: Bearish strategies are labeled in the Strategy Builder and appear in options flow analysis when large put positions are detected.
Bid
The highest price a buyer is currently willing to pay for an option contract. The bid represents the price you would receive if you sold the option immediately at market.
On Ainvest: Displayed alongside the ask price in the Option Chain on both web and mobile platforms.
Bid-Ask Spread
The difference between the highest bid and lowest ask price for an option contract. A narrower spread indicates better liquidity. Wide spreads increase the cost of entering and exiting positions, especially on multi-leg strategies.
On Ainvest: Bid and ask prices are displayed for every contract in the Option Chain.
Block Trade
A large options transaction, typically involving hundreds or thousands of contracts, that is negotiated privately and executed outside the open market. Block trades often signal institutional activity and can indicate strong directional conviction.
On Ainvest: Block trades are flagged within the Block Monitor and Unusual Activity Monitor, showing contract details, size, and sentiment.
Breakeven
The price the underlying asset must reach at expiration for an options trade to produce neither a profit nor a loss. For a call, the breakeven equals the strike price plus the premium paid; for a put, it equals the strike price minus the premium paid.
On Ainvest: Breakeven prices are calculated and displayed in the order preview and strategy detail views.
Bullish
A market outlook expecting the price of an asset to rise. Bullish options strategies include buying calls, selling puts, or building spreads designed to profit from upward movement.
On Ainvest: Bullish strategies are labeled in the Strategy Builder and appear in options flow analysis when large call positions are detected.
Butterfly Spread
A three-strike options strategy that combines a bull spread and a bear spread, using either all calls or all puts. It profits when the underlying stays near the middle strike at expiration and has limited risk on both sides. The maximum profit occurs at the middle strike price.
On Ainvest: Available as a multi-leg strategy in the Strategy Builder.
C
Call Option
A contract that gives the buyer the right, but not the obligation, to purchase the underlying asset at a specified strike price before or at expiration. Traders buy calls when they expect the price of the underlying to rise.
On Ainvest: Call options are displayed on the left side (or top tab) of the Option Chain. They can be traded as single legs or as part of multi-leg strategies.
Cash-Secured Put
A short put strategy where the seller holds enough cash to buy the underlying shares if assigned. This ensures the obligation can be met without margin. It is functionally identical to a short put but emphasizes the capital reserve requirement.
On Ainvest: Model cash-secured puts in the Strategy Builder under the Bullish tab > Short Put.
Condor
A four-strike options strategy that uses four contracts at consecutive strike prices to create a position with limited profit and limited risk. Similar to a butterfly but with a wider profit zone. It profits when the underlying stays within a defined price range.
On Ainvest: Available as a multi-leg strategy in the Strategy Builder.
Covered Call
A strategy where a trader holds a long position in the underlying stock and sells a call option against it to generate income from the premium. The short call is "covered" by the stock position, limiting the risk of the sold call.
On Ainvest: Covered calls can be set up through the Strategy Builder when you hold the underlying shares.
D
Days to Expiration (DTE)
The number of calendar days remaining until an option contract expires. DTE directly affects an option's time value -- the fewer days remaining, the faster time decay (theta) erodes the premium.
On Ainvest: DTE is displayed for each expiration date in the Option Chain and is used as a filter to sort available contracts.
Delta
A Greek that measures how much an option's price is expected to change for every $1 move in the underlying asset. Delta ranges from 0 to 1 for calls and 0 to -1 for puts. It also serves as a rough estimate of the probability that the option will expire in the money.
On Ainvest: Delta values are shown in the Option Chain and the Greeks detail panel for each contract.
E
Early Assignment
The exercise of an American-style option before its expiration date. Early assignment most commonly occurs on deep in-the-money options near ex-dividend dates, when the option holder exercises to capture the dividend. Sellers of options should be aware that assignment can happen at any time.
On Ainvest: Monitor ITM positions in your portfolio and check ex-dividend dates on the ticker detail page.
Expiration Date
The last date on which an option contract can be exercised or traded. After this date, the contract becomes worthless if it is out of the money, or is automatically exercised if it is in the money. Options are available with weekly, monthly, and quarterly expirations.
On Ainvest: Expiration dates appear as selectable tabs at the top of the Option Chain, with filters for weekly and monthly cycles.
G
Gamma
A Greek that measures the rate of change of delta for every $1 move in the underlying asset. High gamma means delta can shift rapidly, which increases both the potential reward and risk of a position. Gamma is highest for ATM options near expiration.
On Ainvest: Gamma values are available in the Greeks detail panel within the Option Chain.
Greeks
A set of risk metrics -- Delta, Gamma, Theta, Vega, and Rho -- that quantify how an option's price responds to changes in underlying price, time, volatility, and interest rates. Greeks are essential tools for evaluating and managing options positions.
On Ainvest: Greeks are displayed for each contract in the Option Chain detail view and the position management screen.
I
Implied Volatility (IV)
A forward-looking metric derived from an option's market price that reflects the market's expectation of how much the underlying asset's price will move over the life of the contract. Higher IV means options are more expensive; lower IV means they are cheaper. IV does not predict direction, only the expected magnitude of movement.
On Ainvest: IV is shown for each contract in the Option Chain and as a standalone metric on the stock detail page. Historical IV charts are also available via the Volatility tools.
In The Money (ITM)
An option that has intrinsic value. A call is ITM when the underlying price is above the strike price; a put is ITM when the underlying price is below the strike price. ITM options are more expensive because part of their premium reflects real, exercisable value.
On Ainvest: ITM contracts are visually distinguished in the Option Chain with shading or highlighting.
Iron Butterfly
A four-leg strategy that sells an ATM straddle (a call and a put at the same strike) and buys an OTM call and an OTM put for protection. It profits most when the underlying stays very close to the center strike at expiration. Risk and reward are both limited.
On Ainvest: Available as a predefined multi-leg strategy in the Strategy Builder.
Iron Condor
A four-leg strategy that sells an OTM call spread and an OTM put spread simultaneously. It profits when the underlying stays within a defined price range through expiration. Both maximum profit and maximum loss are capped, making it a popular income strategy.
On Ainvest: Available as a predefined multi-leg strategy in the Strategy Builder.
L
Long
A position created by buying an option contract. Going long a call means you profit from a price increase; going long a put means you profit from a price decrease. The maximum loss for a long option position is limited to the premium paid.
On Ainvest: Long positions are reflected in your portfolio and marked with a "Buy" label in trade confirmations.
Lot Size
The standard number of shares controlled by one option contract, which is 100 shares for U.S. equity options. This multiplier means that an option quoted at $2.00 actually costs $200 per contract.
On Ainvest: Lot size is factored into all cost calculations displayed in the order entry and position summary screens.
M
Maximum Pain (Max Pain)
The strike price at which the total value of all outstanding option contracts (both puts and calls) would cause the greatest financial loss to option holders at expiration. Some traders use max pain as a magnet price theory, suggesting the underlying may gravitate toward this level near expiration.
On Ainvest: Max Pain is displayed on the Flows Monitor for each ticker, with a chart showing the pain distribution across strikes.
Moneyness
A description of an option's strike price relative to the current price of the underlying asset. Options are classified as In The Money (ITM), At The Money (ATM), or Out of The Money (OTM). Moneyness directly affects an option's premium and its sensitivity to price changes.
On Ainvest: Moneyness is visually indicated in the Option Chain through color coding and strike-price highlighting.
N
Naked Option
An option sold without holding the underlying asset (for calls) or without sufficient cash to cover assignment (for puts). Naked options carry substantial or unlimited risk and require higher margin and approval levels.
On Ainvest: The Strategy Builder labels naked positions separately from covered ones.
Neutral
A market outlook expecting the price of an asset to remain relatively stable, without a strong move in either direction. Neutral options strategies, such as iron condors and butterflies, profit from low volatility and range-bound price action.
On Ainvest: Neutral strategies are labeled in the Strategy Builder and highlighted in educational content on the platform.
O
Open Interest (OI)
The total number of outstanding option contracts for a specific strike and expiration that have not been closed, exercised, or expired. Rising open interest generally indicates new money flowing into the market, while declining OI suggests positions are being closed.
On Ainvest: OI is displayed for each contract in the Option Chain and is used in the Unusual Options Activity analysis.
Option Chain
A listing of all available option contracts for a given underlying asset, organized by expiration date and strike price. The chain displays key data points such as bid, ask, volume, open interest, and Greeks for each contract.
On Ainvest: The Option Chain is the primary interface for browsing and selecting option contracts on both web and mobile platforms.
Option Premium
The total price paid by the buyer (or received by the seller) for an option contract. The premium is composed of intrinsic value (if any) and extrinsic (time) value. Premium is quoted on a per-share basis and multiplied by the lot size (100) to determine the total cost.
On Ainvest: The premium is displayed as the contract's quoted price in the Option Chain and is itemized in the order preview.
Out of The Money (OTM)
An option that has no intrinsic value. A call is OTM when the underlying price is below the strike price; a put is OTM when the underlying price is above the strike price. OTM options are cheaper but require a larger price move to become profitable.
On Ainvest: OTM contracts are visually distinguished in the Option Chain with lighter shading compared to ITM contracts.
P
Pin Risk
The risk that occurs when the underlying asset's price is very close to a short option's strike price at expiration. The seller does not know whether they will be assigned, creating uncertainty about their resulting position over the weekend. Pin risk is highest on expiration Friday for options near the money.
On Ainvest: Check max pain levels in the Flows Monitor to gauge potential pinning zones.
Premium
See Option Premium. In common usage, "premium" refers to the price of an option contract. Sellers collect the premium as income, while buyers pay the premium for the right conveyed by the contract.
On Ainvest: Premium values appear throughout the Option Chain, order entry, and portfolio views.
Put Option
A contract that gives the buyer the right, but not the obligation, to sell the underlying asset at a specified strike price before or at expiration. Traders buy puts when they expect the price of the underlying to fall, or to hedge an existing long stock position.
On Ainvest: Put options are displayed on the right side (or bottom tab) of the Option Chain and can be traded as single legs or in multi-leg strategies.
Put/Call Ratio
A sentiment indicator calculated by dividing the volume (or open interest) of put options by call options. A ratio above 1.0 suggests bearish sentiment; a ratio below 1.0 suggests bullish sentiment. Extreme readings can signal contrarian turning points.
On Ainvest: The Put/Call Ratio is available on the Options Overview page for individual tickers and for the broader market.
R
Rho
A Greek that measures how much an option's price is expected to change for a 1% change in interest rates. Rho is typically the least impactful Greek for short-term options but becomes more relevant for longer-dated LEAPS contracts.
On Ainvest: Rho values are available in the extended Greeks detail panel within the Option Chain.
Realized Volatility
The actual volatility observed in the underlying asset's price over a specific historical period, as opposed to implied volatility which is forward-looking. Comparing realized volatility to implied volatility helps traders assess whether options are overpriced or underpriced.
On Ainvest: Compare realized and implied volatility on the Volatility tab.
Rolling
The practice of closing an existing options position and simultaneously opening a new one at a different strike price, expiration date, or both. Rolling is used to manage risk, extend a thesis, or avoid assignment. Common examples include rolling up (higher strike), rolling out (later expiration), and rolling down (lower strike).
On Ainvest: Use the Option Chain to identify new strikes and expirations when rolling a position.
S
Short
A position created by selling an option contract. Going short a call obligates you to sell the underlying if assigned; going short a put obligates you to buy it. Short option sellers collect premium upfront but face potentially significant risk if the market moves against them.
On Ainvest: Short positions are reflected in your portfolio and marked with a "Sell" label in trade confirmations.
Single Leg
An options trade involving only one contract -- either a standalone call or a standalone put. Single-leg trades are the simplest form of options trading and are the building blocks for more complex multi-leg strategies.
On Ainvest: Single-leg orders are the default order type in the Option Chain. Tap or click any contract to initiate a single-leg trade.
Spread
A multi-leg options strategy that involves simultaneously buying and selling options of the same type (calls or puts) on the same underlying, typically at different strike prices or expirations. Spreads limit both potential profit and potential loss compared to single-leg positions.
On Ainvest: Spreads can be constructed in the Strategy Builder by selecting multiple legs, or by choosing a predefined spread template.
Straddle
A strategy that involves buying (or selling) both a call and a put at the same strike price and expiration. A long straddle profits from a large move in either direction; a short straddle profits when the underlying stays near the strike. It is a pure volatility play with no directional bias.
On Ainvest: Available as a predefined multi-leg strategy in the Strategy Builder.
Strangle
A strategy that involves buying (or selling) a call and a put at different strike prices but the same expiration. Similar to a straddle but typically cheaper, since both legs are OTM. A long strangle requires a larger move to profit but costs less upfront.
On Ainvest: Available as a predefined multi-leg strategy in the Strategy Builder.
Strike Price
The predetermined price at which the option holder can buy (call) or sell (put) the underlying asset upon exercise. Strike prices are set at standard intervals and define the moneyness of a contract. Selecting the right strike is one of the most critical decisions in options trading.
On Ainvest: Strike prices are listed as the central column in the Option Chain, with calls on one side and puts on the other.
T
Theta
A Greek that measures the rate at which an option loses value as time passes, expressed as the dollar amount of daily decay. Theta is always negative for long option holders (time works against them) and positive for option sellers (time works in their favor). Theta accelerates as expiration approaches.
On Ainvest: Theta values are displayed in the Greeks detail panel of the Option Chain and factored into position-level P&L projections.
Turnover
The total dollar value of option contracts traded over a given period, calculated as volume multiplied by the premium price and the lot size. Turnover provides a sense of the capital flowing through a particular option or across an entire chain.
On Ainvest: Turnover data is available in the Options Overview and can be viewed alongside volume and open interest metrics.
U
Underlying
The financial asset -- typically a stock or ETF -- on which an option contract is based. The price movement of the underlying drives the value of its associated options. Every option contract references a specific underlying ticker symbol.
On Ainvest: The underlying asset's price, chart, and fundamentals are displayed at the top of the Options page, directly above the Option Chain.
Unusual Activity
Options trading that deviates significantly from normal patterns in volume, size, or premium. Unusual activity can include large block trades, a sudden spike in volume relative to open interest, or aggressive buying of short-dated options. It may indicate informed or institutional positioning.
On Ainvest: The Unusual Activity Monitor surfaces notable trades with details on size, premium, expiration, and inferred sentiment (bullish, bearish, or neutral).
V
Vega
A Greek that measures how much an option's price is expected to change for a 1% change in implied volatility. Options with more time to expiration have higher vega, meaning they are more sensitive to shifts in market expectations of volatility.
On Ainvest: Vega values are shown in the Greeks detail panel within the Option Chain.
Volatility
A statistical measure of the magnitude of price fluctuations in the underlying asset over a given period. In options, volatility comes in two forms: historical (realized) volatility, based on past data, and implied volatility, derived from current option prices. Higher volatility leads to higher option premiums.
On Ainvest: Both historical and implied volatility metrics are available on the stock detail page and the Options Overview.
Volatility Skew
The pattern of differing implied volatility levels across strike prices at the same expiration. Typically, OTM puts carry higher IV than OTM calls, reflecting greater demand for downside protection. Skew provides insight into how the market prices tail risk.
On Ainvest: Volatility skew is visualized as a chart on the Volatility tab, plotting IV across strikes for a selected expiration.
Volatility Smile
A U-shaped pattern that appears when both deep OTM calls and deep OTM puts have higher implied volatility than ATM options. The smile is more common in currency and commodity options. When the curve is asymmetric -- steeper on the put side -- it is typically referred to as a skew rather than a smile.
On Ainvest: The volatility smile or skew curve is visible on the Volatility tab alongside the skew chart.
Volatility Term Structure
The pattern of implied volatility across different expiration dates for ATM options on the same underlying. Under normal conditions, longer-dated options have higher IV (contango). When near-term IV exceeds longer-term IV (backwardation), it often signals an upcoming event such as earnings or a macro catalyst.
On Ainvest: The term structure is displayed as a chart on the Volatility tab, plotting IV by expiration date.
Volume
The total number of option contracts traded during a specific time period, typically one trading day. High volume indicates active trading interest and generally corresponds to tighter bid-ask spreads and better liquidity.
On Ainvest: Volume is displayed for each contract in the Option Chain and aggregated on the Options Overview page.
Vol/OI Ratio
The ratio of daily trading volume to open interest for a given option contract. A high Vol/OI ratio (above 1.0) suggests significant new trading activity relative to existing positions and is often used as a component in detecting unusual options activity.
On Ainvest: The Vol/OI Ratio is available as a column in the Option Chain and is used as a filter in the Options Rankings.
Z
Zero-DTE (0DTE)
Options that expire on the same day they are traded, meaning they have zero days to expiration. 0DTE options have rapidly decaying premiums and extreme gamma sensitivity, making them popular among short-term traders seeking leveraged exposure to intraday price moves. They carry elevated risk due to the speed of time decay.
On Ainvest: 0DTE options are accessible by selecting today's expiration date in the Option Chain and tracked via the 0DTE Rankings. They are available for major indices and highly liquid stocks.
See Also
- What Are Options? -- Introduction to calls, puts, and how options work.
- Understanding the Greeks -- A deep dive into Delta, Gamma, Theta, Vega, and Rho.
- Reading the Option Chain -- Step-by-step guide to navigating Ainvest's Option Chain.
- Implied Volatility Explained -- What IV tells you and how to use it.
- Strategy Builder Overview -- An overview of common strategies from covered calls to iron condors.
- Unusual Activity Monitor -- How to interpret and use unusual activity signals on Ainvest.
Explore Ainvest Options: Open the Options Dashboard — see these concepts in action with live market data.