What is a Straddle? Definition, Formula, and Example

What is a straddle?

A straddle is an options position with both a call and a put at the same strike and the same expiration. A long straddle buys both legs and profits when the underlying moves far enough in either direction to exceed the premium paid. A short straddle sells both legs and profits if the stock stays near the strike through expiration. The long straddle is the purest volatility bet available to a retail trader — direction-agnostic, dependent only on the size of the realized move relative to what was already priced in.

How a straddle is structured and priced

Pick a strike K (usually at-the-money), an expiration, and buy or sell one call and one put at that strike. Let C = call premium, P = put premium, total debit = C + P.

Long straddle breakevens at expiration:

Upper BE = K + (C + P)

Lower BE = K − (C + P)

Max loss (long) = C + P. Max profit: unbounded on the call side; (K − C − P) × 100 per contract on the put side.

The implied move priced by an ATM straddle is often used as a proxy for the expected earnings move:

Expected move ≈ (C + P) / Spot

A stock at $100 with a $4 straddle prices a ±4% move by expiration.

Worked example

An earnings straddle on TSLA into the April 2026 print. Stock at $245 on 2026-04-22 with earnings after close. The weekly $245 call trades $9.40, the $245 put trades $9.10. Total debit = $18.50 × 100 = $1,850 per straddle. Breakevens: $263.50 and $226.50. The market is pricing a ~7.5% move.

Scenario A: TSLA reports, gaps to $268 at the open on 2026-04-23. The call is worth intrinsic $23 plus residual time value; the put decays to $0.15. Combined value $23.15, profit $4.65 × 100 = $465 per pair, a 25% return in one day.

Scenario B: TSLA opens flat at $246. Post-earnings IV collapses 35%. The call drops to $2.80, the put to $2.10, combined $4.90. Loss $13.60 × 100 = $1,360 — a 73% loss despite the stock barely moving, because the straddle needed the move *and* the vol.

When traders use straddles

• Earnings plays where implied volatility is priced cheaply relative to historical realized move on that ticker.
• Binary events: FDA decisions, court rulings, Fed meetings, merger-arb break/close dates.
• Pure volatility bets when a trader has a view on upcoming realized vol but no directional edge.
• Gamma scalping: long straddles carry positive gamma; market makers delta-hedge them dynamically to harvest realized vol against the premium paid.

Limitations and common misconceptions

The most-missed risk is IV crush. Earnings straddles routinely lose money on 3–5% stock moves because implied volatility collapses the moment uncertainty resolves. A straddle needs the realized move to exceed the *implied* move priced in — not merely to be nonzero. Theta decay bleeds both legs simultaneously; a held-through-time straddle loses to the clock even if the stock drifts. Short straddles have unbounded loss and undefined margin requirements under Reg T portfolio margin — a GME-style gap can wipe an account in one session. Finally, "ATM straddle" does not mean "ATM forever" — as the stock moves, the straddle becomes directional and loses its pure-vol character, converting into a synthetic long or short with full directional risk.

Related terms

• What is an Iron Condor? — the defined-risk short-volatility cousin
• What is Implied Volatility? — the input a straddle trader is really betting on
• What is Options Delta? — roughly zero at inception, drifts as spot moves
• What is Options Gamma? — peak gamma sits exactly at an ATM straddle's strike
• What is Options Theta? — the daily cost of holding a long straddle