Limited-risk call butterfly construction in volatile oil

A margin shock reshaped crude access

After April 2020, crude futures traded about 40 dollars per barrel below zero. Retail oil access tightened through higher margins and front-month restrictions.

Margins to buy or sell the futures nearly tripled. Many commodity brokerages also required extra margin to open deferred-month positions.

Implied volatility made long options unattractive

Weeks of elevated volatility left listed crude options expensive enough that buying them outright was treated as an unattractive construction choice. Implied-volatility here is the elevated option premium left after that surge, and it is why outright option buying was set aside in favor of a debit butterfly.

How the August butterfly was assembled

A call butterfly is a limited-risk option-spread meant to retain value if the futures price settles inside a chosen band, while giving up open-ended upside and remaining exposed if the market is too far in the intended direction.

A butterfly-spread buys the two wing strikes and sells twice as many of the body strike so value peaks at the middle strike and is capped on both sides. An option-spread is the multi-leg procedure whose debit or credit, strike spacing, and shared expiry define the testable payoff instead of a single long or short option.

The worked August construction bought the 30 call, sold two 35 calls, and bought the 40 call, so the view only had to finish inside a 10-dollar window around 35. That band is the defined-range-settlement, the expiration range between the lower and upper wing in which the structure can finish with residual value.

Debit-cap and equally spaced wings

That example debit was about 60 cents, or 600 dollars, because each penny in the crude option was worth 10 dollars. Net debit is the sum of the two long-option premiums minus the premium collected on the two short calls. The debit-cap is that net premium paid for the long wings minus premium collected on the short body, which is the prepaid maximum loss of the construction.

Equidistant-wings place the wing strikes the same distance above and below the body so the butterfly is symmetric and typically carries little extra margin beyond the premium. With equally spaced wings the butterfly was described as needing little or no extra margin beyond the premium paid. A finish below 30 left that 600-dollar debit as the loss before transaction costs.