Critiquing event-priced straddles and expiration pin-risk

Event-pricing before a scheduled catalyst

Before a scheduled catalyst, collective option bidding can be converted into an implied estimate of the share move expected once the news is released. That conversion is event-pricing: reading elevated pre-catalyst option premiums as an implied estimate of the share move expected after the news.

Ahead of binary announcements such as regulatory decisions, option premiums are often bid above theoretical fair value based on recent underlying movement because traders expect a large enough post-news move to offset the extra premium.

After the news, long premium can still lose

After the announcement, long-premium holders can lose through a small share move, an implied-volatility-crush as premiums revert toward more typical pricing, or both, even when a directional view later proves profitable.

Pricing an at-the-money-straddle and an options-strangle with post-event implied volatility shows how large a next-session stock move long nondirectional holders need to break even. The at-the-money-straddle is a same-strike call-and-put pair used to measure that next-session break-even move. The options-strangle is an out-of-the-money call-and-put pair used with straddles to estimate the event-week move priced into the options market.

Comparing historical implied and statistical-volatility charts is presented as a way to estimate where premiums may trade after news. Statistical-volatility is the historical realized volatility of the underlying, used as a benchmark against implied volatility around events. Post-announcement implied settlement is still treated as uncertain.

Opening-versus-closing is easy to over-read

An opening option trade is treated as more informative than a closing trade because opening requires a capital outlay and greater risk tolerance, while closing motives can be obscured by stock overlays or volatility-basket hedges. Opening-versus-closing is that distinction between new risk-taking option flow and offsetting trades that may only complete an existing hedge.

Opening-flow interpretation is described as difficult except in limited cases such as low open interest plus obvious call buying ahead of an event. Even those cases are not treated as sufficient reason to commit resources without further work.

Pin-risk that appears only at expiration

Short option holders who allow contracts to expire as if worthless face assignment-risk that is more common when the stock is near the strike. Assignment-risk is the chance that a short option is exercised and leaves an unwanted long or short stock position. The same risk can also affect options that appear far out-of-the-money or deep in-the-money if news arrives.

Near expiration, a short call that looks worthless at the official close can still be exercised by a long holder who is short stock and prefers exercise to buying shares in a thin after-hours market. Pin-risk is the chance that a stock finishes near a strike at expiration and short options thought to be worthless are exercised. Buying the short option back is presented as a way to avoid that pin-related assignment.