When is a long straddle the right trade and how do I structure it?

Question

AcadiFi · Accepted Answer

A long straddle buys an ATM call and an ATM put with the same strike and expiration. For Tamarack Biotech at $48, you buy the $48 call for $3.20 and the $48 put for $3.10, paying $6.30 total. Break-even prices are $54.30 on the upside and $41.70 on the downside. You profit if the stock moves more than ±13.1% in either direction by expiration.

The trade is long vega (benefits from rising implied volatility) and long gamma (benefits from large moves), but short theta (loses time value daily). This is why straddles are typically held for short windows around catalysts — FDA decisions, earnings, central bank meetings.

The major risk is 'volatility crush.' If IV was pumped to 85% before the event and collapses to 40% after, the straddle can lose money even if the stock moves 10%. A CFA Level II candidate should compute the implied move (roughly straddle cost / stock price) and compare it to the historical realized move. If the market already prices in a 13% move but the historical average is 8%, the straddle is overpriced.

Exit discipline: take profits at 50-100% of cost on a directional breakout, and cut losses if IV collapses without the expected move.

When is a long straddle the right trade and how do I structure it?

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