Constructing option overlays for beta-adjusted portfolios

Match the overlay to the book

How an options overlay is built around a multi-stock book depends on the number of names, listed-option liquidity in those names, risk-reward preference, and how much time can be spent managing the book.

Editorial: treat overlay construction as a matching problem. Convert the stock book into beta-adjusted dollars first, then choose covered-call writing, a protective collar, or an index sleeve according to listed-option liquidity and how much single-name risk the hedge must still carry.

Covered calls when names are few and liquid

When holdings are few and options are liquid, a covered call can be written one-for-one against shares to lower the position cost basis, but assignment on the short call still has to be managed.

Covered-call writing is selling one listed call per long share lot so collected premium lowers net cost. Downside help stops at that premium, and the short call can be assigned.

A covered-call overlay only cushions losses up to the premium sold, so an abrupt decline can leave that sleeve looking thin as protection.

Collars that keep a lower-strike put

A protective collar keeps the short call and adds a long put struck below it, typically sharing expiration.

That paired overlay bounds the unmanaged downside left by a call-sale-only sleeve, rather than leaving protection to premium alone.

Index sleeves when liquidity or time is scarce

When single-name option markets are thin or management time is scarce, the option legs of a collar can be placed on a correlated index as a bearish risk reversal, leaving the existing stock holdings as the long side.

An index risk reversal is those call-sale and put-purchase legs on the index while the existing stock book remains the long exposure.

Beta hedging scales index option size by the holdings combined beta so the overlay notional matches systematic dollar risk instead of raw portfolio market value.

Index overlay size is set from dollar risk scaled by combined beta. A 50000 book with a beta of 2.00 is treated as 100000 of market exposure to hedge.

With an S&P 500 exchange-traded fund near 110, one contract covers 100 shares, or about 11000 of market exposure, so nine long puts and nine short calls cover about 99000, close to a 100000 beta-adjusted book.