A straddle combines a call and a put on the same stock with the same strike and expiry, usually at the money; a strangle uses an out-of-the-money call and an out-of-the-money put at two different strikes. Bought, either position profits from a large move in either direction; sold, it profits if the stock stays quiet, but with large and potentially unlimited risk.
How it works
Per share, with debit D (the total paid for both options), straddle strike K, strangle put strike Kp and call strike Kc (one contract covers 100 shares):
| Position | Breakevens at expiry | Max loss | Max profit |
|---|---|---|---|
| Long straddle | K − D and K + D | D | Unlimited above; K − D if the stock goes to zero |
| Long strangle | Kp − D and Kc + D | D | Unlimited above; Kp − D if the stock goes to zero |
| Short straddle or strangle | Same, with D as the credit | Unlimited above | The credit |
A long straddle or strangle has positive gamma and vega and negative theta: it benefits from large moves and rising implied volatility, and loses value every day nothing happens. The short versions are the mirror image. The price of the at-the-money straddle is also the usual estimate of the expected move to that expiry.
How to read it
- Cost against the expected move. Buying the straddle is a bet that the stock moves more than the options already price in. Compare the debit with how far the stock has actually moved in similar periods, or on past earnings reports.
- Volatility level. Long straddles and strangles are better value when implied volatility is low relative to realized volatility, and expensive when it is high.
- Events. Implied volatility usually rises into earnings and falls sharply after the report, an effect called IV crush. A buyer can be right about a move and still lose.
- Straddle or strangle. The strangle costs less, but its breakevens sit further out, so it needs a bigger move. It loses less if nothing happens.
- Time. Time decay accelerates in the final weeks, so many buyers choose an expiry shortly after the expected catalyst and close soon after it.
Worked example
Illustrative numbers only, not a recommendation. A stock trades at $100, with 30 days to expiry.
- Straddle: buy the $100 call for $4.00 and the $100 put for $3.80. Debit $7.80, or $780. Breakevens $92.20 and $107.80.
- Strangle: buy the $105 call for $1.80 and the $95 put for $1.70. Debit $3.50, or $350. Breakevens $91.50 and $108.50.
| Stock at expiry | Straddle | Strangle |
|---|---|---|
| $100 | −$780 | −$350 |
| $106 | −$180 | −$250 |
| $112 | +$420 | +$350 |
| $88 | +$420 | +$350 |
The straddle costs more but starts paying sooner; the strangle loses less when the stock stays put. Before an earnings report, if the stock gaps 6% to $106 but implied volatility falls by half overnight, the straddle can be worth less than it cost the day before, even though the move happened.
Assignment and exercise
- Long options at expiry. Equity options that finish at least $0.01 in the money are normally exercised automatically. A long call exercised means buying 100 shares; a long put means selling, or going short, 100 shares. Close or instruct your broker before expiry if you do not want the stock position.
- Short straddles and strangles. Options on US stocks are American-style, so the in-the-money leg can be assigned early, especially a deep in-the-money call just before an ex-dividend date. At expiry, one leg of a short straddle is almost always in the money.
- Margin. Short straddles and strangles require margin approval, and the requirement can rise sharply when the stock moves.
Limitations and common mistakes
- Paying for a move already priced in. A large expected move is not an edge on its own; the question is whether the actual move exceeds it.
- Ignoring IV crush and time decay. Both work against the buyer every day the move does not come.
- Selling without a limit. Short straddles and strangles collect steady premiums until one gap erases months of them. A defined-risk alternative is the iron condor.
- Two spreads to cross. Each leg has its own bid/ask spread; fills at the mid price are optimistic.
In Clear Tape
Pro members can build a long straddle or a long strangle on any stock in the Options strategies section of the Options page; short straddles and strangles are not built, and the closest short-volatility trades offered there are the iron butterfly and iron condor, which cap the loss. The straddle buys the call and put at the strike nearest the price; the strangle starts near 25 delta on each side. The default expiry is the first one after the next earnings report, otherwise the one closest to 30 days. The build shows the debit at mid and at natural prices, max loss, breakevens, chance of profit, the expected move, a payoff chart with Today and In N days lines that assume IV is unchanged, so they do not show IV crush, and the Greeks. The fit rating favors these trades when options are cheap or the earnings move is priced low. The Earnings panel compares the move priced in with the stock's average move on past reports. No orders are placed; data reflects the previous session's close. See pricing.
For educational purposes only. Not investment advice.