Tim Olson
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description, tags
| description | tags | ||||
|---|---|---|---|---|---|
| A neutral net credit strategy selling an ITM call at K1, buying two ATM calls at K2, and selling an OTM call at K3, profiting from a large move away from K2. |
|
Short Call Butterfly
Section: 2.42 | Asset Class: Options | Type: Volatility
Overview
The short call butterfly is a volatility strategy consisting of a short ITM call at K1, a long position in two ATM calls at K2, and a short OTM call at K3. The strikes are equidistant: K3 - K2 = K2 - K1 = kappa. This is a net credit trade. In this sense it is an income strategy. However, the potential reward is sizably smaller than with a short straddle or short strangle (albeit with lower risk). The trader's outlook is neutral.
Construction
- Sell 1 call option at strike K1 (ITM, lower wing)
- Buy 2 call options at strike K2 (ATM, body)
- Sell 1 call option at strike K3 (OTM, upper wing, K3 > K2 > K1)
- All same expiry; K3 - K2 = K2 - K1 = kappa (equidistant)
Net credit: C
Payoff Profile
f_T = 2 × (S_T - K2)+ - (S_T - K1)+ - (S_T - K3)+ + C
- Upper breakeven: S*_up = K3 - C
- Lower breakeven: S*_down = K1 + C
- Max profit: P_max = C (if S_T <= K1 or S_T >= K3; all options at their extremes)
- Max loss: L_max = kappa - C (if S_T = K2 at expiry)
Key Conditions / Signals
- Neutral; expects stock to move significantly away from K2 by expiry
- High implied volatility environment; collect larger credit upfront
- Lower risk than a short straddle or strangle but also lower reward
Notes
The short call butterfly is the reverse of the long call butterfly. Credit is collected upfront and profit is achieved if the stock moves far enough from K2. The maximum loss is bounded by the wing width kappa minus the credit received.