Every term you’ll encounter on a chain, in a brokerage agreement, or across the strategy library — defined clearly and cross-linked where useful.
An option that can be exercised at any time between purchase and the expiration date. Most equity and ETF options traded in the U.S. are American-style. This contrasts with European-style options, which can only be exercised at expiration. The possibility of early exercise is a risk sellers of options on high-dividend stocks must monitor carefully.
The process by which a short option holder is required to fulfill their contractual obligation — delivering or receiving shares of the underlying at the strike price. For short calls, this means selling shares. For short puts, this means buying them.
Assignment can happen any time before expiry for American-style options, but is most common immediately before ex-dividend dates and at expiry.
An option whose strike price is equal to (or very close to) the current price of the underlying. ATM options have the highest extrinsic value of any strike on the chain, the most theta exposure, and a delta near ±0.50.
The difference between the highest price a buyer will pay (bid) and the lowest price a seller will accept (ask) for an option contract. The spread represents the cost of immediacy — you give it up when entering or exiting a position at market.
Wide spreads, common in low-volume underlyings, significantly increase transaction costs. Liquid options on major indexes and high-volume ETFs tend to have tight spreads, making entries and exits closer to fair value.
An order to purchase an option contract that you previously sold short, closing out your short position. When a short option decays to a target profit level (commonly 50% of max credit), it is bought back to close. Buying to close eliminates remaining assignment risk and locks in the gain.
An order to purchase an option contract as a new long position. The debit paid is the maximum possible loss on the trade. The position profits if the option can be sold for more than the purchase price, or if exercised for a net gain greater than the premium paid.
A strategy that buys and sells options on the same underlying and strike price but at different expiration dates. The typical structure sells a near-term option and buys a longer-dated option to profit from the faster time decay of the short leg. Calendar spreads benefit from stable price action and are sensitive to changes in implied volatility between the two expirations.
A contract that gives the holder the right, but not the obligation, to buy the underlying asset at the strike price on or before the expiration date. Long calls profit when the underlying rises above the breakeven price. Short calls profit when the underlying stays below the strike and the call expires worthless.
An options settlement method in which no physical shares change hands at expiration. Instead, the difference between the strike price and the final settlement value is paid in cash. Most index options (SPX, NDX, RUT) are cash-settled, which eliminates the mechanics of share delivery and removes pin risk at expiration.
A defined-risk strategy combining a long position in the underlying with a long put (downside protection) and a short call (upside cap). The short call premium partially or fully offsets the cost of the put. Collars limit both the maximum loss and the maximum gain, making them a common strategy for protecting existing equity positions.
A strategy in which the seller of a call option simultaneously holds a long position in the same underlying asset. The long stock covers the obligation to deliver shares if assigned. Covered calls generate income in neutral to moderately bullish markets while capping upside above the strike price.
The rate of change of an option’s price with respect to a $1 change in the underlying. Long calls have positive delta (0 to +1); long puts have negative delta (0 to −1).
Practically, delta also serves as a rough proxy for the probability that an option finishes in-the-money at expiry. A 30-delta short put has roughly a 70% chance of expiring worthless.
The number of calendar days remaining until an option contract expires. Short premium strategies typically open positions at 30–45 DTE and close at 21 DTE to avoid the gamma acceleration that intensifies in the final weeks before expiry.
The act of exercising an American-style option before its expiration date. Long call holders may exercise early to capture a dividend; long put holders may exercise early if the remaining time value is negligible and the option is deep in-the-money. Early exercise is generally suboptimal unless one of these specific conditions is met.
The cutoff date that determines whether a stockholder is entitled to the upcoming dividend payment. Shares must be held before this date to receive the dividend. For options traders, the ex-dividend date is critical: short call holders face elevated assignment risk as long call holders may exercise early specifically to capture the dividend.
The act of invoking the right granted by an option contract to buy (call) or sell (put) the underlying asset at the strike price. Most equity options are American-style and can be exercised at any time before expiration. In practice, the majority of options are closed in the market rather than exercised.
The date after which an option contract is void and no longer tradeable. Standard equity options expire on the third Friday of each month; weekly contracts expire every Friday. At expiration, an in-the-money option is exercised (or assigned to the short side) and an out-of-the-money option expires worthless.
The rate of change of delta with respect to a $1 move in the underlying. A call with a delta of 0.40 and a gamma of 0.06 will have a delta of approximately 0.46 if the underlying rises $1. Gamma is highest for ATM options near expiration — making short gamma positions riskiest in the final days before expiry.
An order instruction that keeps a limit order active in the market until it is either filled or manually cancelled by the trader. Most platforms default to day orders (cancelled at session close) unless GTC is specified. Used when entering limit orders at a desired price that may not immediately be available in the market.
A statistical measure of how much an underlying asset’s price has actually moved over a given lookback period, expressed as an annualized percentage. HV reflects realized past movement, while implied volatility reflects expected future movement.
Comparing HV to IV is a common method for assessing whether options are relatively expensive or cheap. When IV is significantly above HV, premium tends to be rich and conditions may favor selling.
The market’s consensus forecast of the underlying’s annualized volatility, derived by solving the option pricing model backwards from the current premium. High IV means rich premium; low IV means cheap premium.
IV is the single most important variable in deciding whether to be a net seller or net buyer of options at any given time.
An option that has intrinsic value. A call is ITM when the underlying price is above the strike; a put is ITM when the underlying price is below the strike. ITM options carry both intrinsic and extrinsic value, and are more likely to be exercised or assigned at expiration.
The portion of an option’s premium that represents its in-the-money amount. A call with a $50 strike when the underlying trades at $55 has $5 of intrinsic value. Out-of-the-money options have zero intrinsic value — their entire premium is extrinsic (time) value.
A defined-risk, neutral strategy that sells both an ATM call and an ATM put while buying an OTM call and an OTM put for protection. Similar to an iron condor but with the short strikes at the same price. Maximum profit occurs when the underlying expires exactly at the short strike. Iron butterflies collect more premium than iron condors but have a narrower profit zone.
Where current implied volatility sits as a percentile of its 52-week range. IV Rank of 100 means today’s IV is at the 12-month high; IV Rank of 0 means it’s at the 12-month low. Selling premium below IV Rank 35 is generally unattractive — the risk/reward isn’t there.
Long-Term Equity Anticipation Securities — standardized option contracts with expiration dates more than one year away (up to three years). LEAPS behave like standard options but carry significantly more time value and are less affected by short-term price swings. They are used for long-term directional positions or as cost-effective substitutes for stock ownership.
Options control 100 shares of the underlying per contract, allowing traders to gain or hedge large notional exposure with relatively small capital. This amplifies both gains and losses relative to the capital invested. Leverage is a defining feature of options, and managing leveraged exposure is a core risk management discipline.
The ease with which an option position can be entered or exited at a fair price. Liquid options have tight bid/ask spreads, high volume, and substantial open interest. Illiquid options carry wide spreads that function as a hidden transaction cost on every trade. Trading liquid underlyings — major indexes, large-cap ETFs, high-volume stocks — is a foundational risk management practice.
A position established by purchasing an option contract. The long holder paid a debit and has the right, but not the obligation, to exercise. Maximum loss is limited to the premium paid; the position benefits from a favorable move in the underlying or an increase in implied volatility.
Capital required by a brokerage to support short options positions that carry risk beyond the premium collected. Naked short calls and puts require margin because potential losses can exceed the credit received. Defined-risk positions such as spreads require margin limited to the width of the spread minus the credit collected.
If account value falls below the required maintenance margin, the broker will issue a margin call — a notice to deposit additional funds or face forced liquidation of positions.
The number of shares of the underlying asset that one standard option contract controls. For most equity and ETF options, the multiplier is 100 — meaning one contract represents 100 shares. A premium of $2.00 therefore costs $200 per contract. The multiplier is what converts option price into dollar P&L and is a key component of position sizing.
The total number of open, unsettled option contracts for a given strike and expiration. High open interest indicates active participation and generally better liquidity. Unlike volume, which resets to zero each day, open interest only changes when new contracts are created or existing ones are closed out.
A real-time listing of all available option contracts for a given underlying, organized by expiration date and strike price. The chain displays bids, asks, volume, open interest, and greeks for every call and put. It is the primary interface for analyzing and selecting option positions.
An option with no intrinsic value. A call is OTM when the underlying price is below the strike; a put is OTM when the underlying price is above the strike. OTM options consist entirely of extrinsic value, which decays to zero if the option expires OTM. Sellers of OTM options are positioning for this outcome.
An options settlement method in which actual shares of the underlying are delivered when the option is exercised or assigned. Most equity and ETF options are physically settled — if a short put is assigned, 100 shares must be purchased at the strike price. This contrasts with cash settlement used for most index options.
The risk that an underlying asset’s price settles very close to a short option’s strike price at expiration, creating uncertainty about whether the contract will be exercised or expire worthless. A trader short an option right at-the-money into expiration may not know until after market close whether they have been assigned, leaving an unintended overnight position.
The price paid by an option buyer to the seller for the rights conveyed by the contract. For buyers, the premium is the maximum loss. For sellers, the premium collected is the maximum gain. Premium is composed of intrinsic value (if any) plus extrinsic (time) value.
A contract that gives the holder the right, but not the obligation, to sell the underlying asset at the strike price on or before the expiration date. Long puts profit when the underlying falls below the breakeven price. Short puts profit when the underlying stays above the strike and the put expires worthless.
The rate of change of an option’s price with respect to a 1-percentage-point change in the risk-free interest rate. Long calls have positive rho; long puts have negative rho. Rho is the least impactful of the standard Greeks for most short-dated equity and index options, but becomes more meaningful for LEAPS where time is a significant factor.
An order to sell an option contract that you previously bought long, closing out your long position. Selling to close captures any remaining time value and exits the trade without exercising the contract.
An order to sell an option contract as a new short position, collecting the premium upfront as a credit. This establishes an obligation: the seller must fulfill the contract terms if the buyer exercises. The credit received is the maximum gain on the trade.
A position established by selling an option contract. The short seller collected a credit and has an obligation to fulfill the contract if assigned. Maximum gain is the premium collected. Risk depends on whether the position is covered (limited) or naked (potentially substantial).
A strategy that simultaneously buys (or sells) a call and a put at the same strike price and expiration on the same underlying. A long straddle profits from a large price move in either direction. A short straddle collects premium and profits if the underlying stays near the strike through expiration. Straddles are highly sensitive to changes in implied volatility.
Similar to a straddle but with the call and put at different strikes — typically both out-of-the-money. A long strangle is cheaper than a long straddle but requires a larger price move to profit. A short strangle collects premium on both sides and profits if the underlying stays between the two strikes at expiration.
The predetermined price at which an option contract can be exercised. For a call, the strike is the price at which the holder can buy the underlying. For a put, the strike is the price at which the holder can sell. The relationship between the strike and the current underlying price determines whether an option is ITM, ATM, or OTM.
The rate at which an option loses value as time passes, all else equal. Quoted as a daily dollar amount: a theta of −$8 means the option will lose $8 of value tomorrow if nothing else changes.
Theta is non-linear — it accelerates as expiration approaches, especially inside 21 DTE for ATM options. Short premium strategies are positive theta (time decay works in their favor); long premium strategies are negative theta.
The portion of an option’s premium that exceeds its intrinsic value. It reflects the probability that the option will move further in-the-money before expiration — a function of time remaining (DTE) and implied volatility. All options lose time value as expiration approaches; this erosion is measured by theta. Sellers benefit from this decay; buyers work against it.
The financial instrument that an option contract is based on. For equity options, the underlying is a stock or ETF. For index options, it is a market index such as the S&P 500. For futures options, it is a futures contract. The price of the underlying directly determines whether an option is ITM, ATM, or OTM at any given moment.
The rate of change of an option’s price with respect to a 1-percentage-point change in implied volatility. Long options have positive vega; short options have negative vega.
An iron condor with a portfolio vega of −$300 will gain $300 for every 1-point drop in IV, and lose $300 for every 1-point rise — independent of which direction the underlying moves.
A strategy that buys and sells two options of the same type (both calls or both puts) with the same expiration but different strike prices. Vertical spreads define both maximum risk and maximum reward. A credit spread collects a net premium upfront; a debit spread pays a net premium. They are the most common defined-risk alternative to selling naked options.
The uneven distribution of implied volatility across different strike prices for the same expiration. In equity markets, lower strikes (puts) typically carry higher IV than higher strikes (calls), reflecting persistent demand for downside protection. Skew affects the relative pricing of OTM puts versus OTM calls and is an important consideration when selecting strikes for short premium strategies.
The number of option contracts traded for a specific strike and expiration on a given day. High volume indicates active trading interest. Unusual volume spikes can signal that informed participants are positioning ahead of an expected move. Volume resets to zero at the start of each trading session.
The Alpha Bridge™ framework takes you from these fundamentals through licensing, fund structure, and capital-ready positioning — step by step.
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