Listed option contract

Definition

A listed equity option is a standardized contract giving the buyer the right — not the obligation — to buy (call) or sell (put) the underlying at a fixed strike price until expiration. The seller (writer) takes on the matching obligation in exchange for the premium. US-listed options are issued and guaranteed by the Options Clearing Corporation (OCC); the governing risk document is the OCC options disclosure document.

How it works / structure

• Standard terms (ms-contract-specs): underlying, strike, expiration date, type (call/put), style (American — exercisable any time; most US equity options — vs European — exercise at expiration only, common for index options), multiplier (typically 100 shares per contract).
• Price components: intrinsic value (amount in the money) plus time value; time value is driven by time to expiry, implied volatility (opt-implied-volatility), rates, and dividends — formalized in Black-Scholes-class models (Black and Scholes 1973).
• Position grid: long call, short call, long put, short put — every options strategy (pillar 4) is a combination of these four legs plus stock.
• Lifecycle: open → trade/adjust → close, exercise, assignment, or expiration (ms-expiration-exercise-assignment).
• Simulation parameters: per-leg strike, expiry, type, style, multiplier, entry premium; greeks for risk evolution; assignment and expiration rules from the mechanics entries.

When it applies

When a thesis has a shape a stock position cannot express: defined time windows (options expire), defined risk (long premium risks only the premium), leverage on direction, income from obligation-taking (short premium), or a view on volatility itself rather than direction.

Risk profile & failure modes

• Long options: maximum loss is the premium — but that loss is the most common outcome when the underlying fails to move enough before expiry; time decay (greek-theta) works against the holder.
• Short options: uncovered calls have unlimited theoretical loss; uncovered puts risk the full strike value; assignment can occur early on American-style contracts (the disclosure document treats writers’ risks at length).
• Liquidity: wide spreads in thin chains make fair execution the exception, not the rule.
• Nonlinearity: exposures change with the underlying and time (greek-gamma); a hedged position today is not hedged tomorrow without management (mgmt-delta-hedging).

Evidence & limits

Contract mechanics are exchange/clearinghouse rules (OCC), not hypotheses. On pricing: Black-Scholes-class models are the standard framework; their known deviations (smile/skew, opt-volatility-skew) are measured market data. The average richness of index option premium relative to subsequently realized volatility (the volatility risk premium) is documented in the academic literature, is time-varying, and reverses in stress — no entry treats short premium as reliable income.

Falsifiable-thesis examples

Illustrations only, not signals:

• “X’s 30-days-out at-the-money straddle, priced at $P today, will exceed the stock’s realized absolute move to expiration” — falsified if the realized move exceeds the priced move.
• “Y will close above strike K at expiration date D” — falsified by a close at or below K on D.

Cross-references

• Mechanics: ms-option-chain, ms-expiration-exercise-assignment, ms-settlement, ms-contract-specs
• Math: greek-delta … greek-rho, opt-implied-volatility, opt-expected-move
• Strategies: pillar 4 options entries (strategy-covered-call through strategy-ratio-spread)
• Account mechanics: acct-assignment-tax, acct-margin-rules