- Call option
- The right (not obligation) to BUY a stock at a specific price before expiry. You buy calls when you think the stock is going up.
- Put option
- The right (not obligation) to SELL a stock at a specific price before expiry. You buy puts when you think the stock is going down, or to hedge a long position.
- Strike price
- The price at which an option lets you buy (call) or sell (put) the underlying stock.
- Expiry Expiration date
- The date the option contract becomes worthless unless exercised or sold. Weeklies (Friday) are most liquid; monthlies (3rd Friday) are benchmarks.
- ITM In-The-Money
- A call is ITM if stock price is above strike. A put is ITM if stock price is below strike. ITM options have intrinsic value.
- OTM Out-of-The-Money
- The opposite of ITM. Call with strike above stock price; put with strike below stock price. OTM options are pure time-value — worthless if they expire OTM.
- ATM At-The-Money
- When the strike equals (or is closest to) the current stock price. ATM options have the most time decay and the highest gamma.
- Premium
- The price you pay to buy an option, or receive to sell one. Quoted per share — “$2.50 premium” = $250 per contract (100 shares).
- IV Implied Volatility
- The annualized expected move of the stock, backed out of the option's price. High IV = expensive options; low IV = cheap options. IV spikes before earnings and crashes right after.
- IV Rank
- Where current IV sits in the last 52 weeks as a percentile. IV Rank 90 = IV is higher than 90% of the past year. High rank = favor selling options; low rank = favor buying.
- IV crush
- The sharp collapse in option premium right after a known event (earnings, FDA decision) because the uncertainty is resolved. Can destroy long option positions even when direction was right.
- Delta (Δ)
- How much the option's price moves per $1 move in the stock. Delta 0.50 = option gains $0.50 when stock gains $1. Also approximates the probability of finishing ITM.
- Gamma (Γ)
- How fast delta changes. High gamma = delta shifts rapidly, which is great when you're right and brutal when you're wrong. Peaks ATM near expiry.
- Theta (Θ)
- How much premium the option loses per day from time decay, all else equal. Long options bleed theta; short options collect it. Accelerates as expiry approaches.
- Vega (V)
- How much the option's price moves per 1% change in IV. Long options are long vega (benefit from rising IV); short options are short vega.
- CSP Cash-Secured Put
- Selling a put while holding enough cash to buy the stock if assigned. A bullish-to-neutral income strategy — you collect premium, and if price tanks you end up owning the stock at your chosen price.
- Covered call
- Selling a call against 100 shares of stock you own. Collects premium; caps upside. Used to generate income on positions you're holding anyway.
- Spread
- Any options position with two or more legs. Common forms: vertical spread (different strikes, same expiry), calendar spread (same strike, different expiries).
- Debit
- A trade you pay to put on. Debit spread = net cost. Maximum loss is the debit paid.
- Credit
- A trade that pays you to put on. Credit spread = net premium received. Maximum profit is the credit; maximum loss is the width of the spread minus the credit.
- Assignment
- When the buyer of an option you sold exercises, forcing you to buy (short put) or sell (short call) the stock at the strike. Most likely on ITM options near expiry.
- Exercise
- Using your option to actually buy (call) or sell (put) the underlying at the strike. Most traders close their position rather than exercising.
- Roll
- Closing an existing option position and opening a new one further out in time (and sometimes at a different strike). Used to avoid assignment or extend the trade.
- PoP Probability of Profit
- The approximate chance an options position finishes profitable, derived from IV and time to expiry. 70% PoP doesn't mean the trade makes money — it means the trade expires with at least $0.01 of profit.