Options Expiration
Options expiration is the date on which a stock option contract becomes worthless if not exercised. Standard US listed options expire on the third Friday of each month; weekly options expire most Fridays.
Why it matters for stock prices
Options expiration days — especially quarterly OpEx (the third Friday of March, June, September, December) — frequently produce outsized intraday moves and volume spikes in the underlying stocks. Mechanically: as expiration approaches, options dealers who are short gamma must hedge their positions by buying or selling the underlying, which can amplify intraday moves into and through expiration.
The phenomenon is observable as:
- Pinning: stock prices gravitating toward strike prices with heavy open interest
- Volume bursts: opening minutes of expiration day often see 2-3x average volume in heavily-optioned names
- Post-expiration unwinds: positions held only to expire often unwind in the following session
Triple witching
Triple witching is the simultaneous expiration of stock options, stock-index futures, and stock-index options on the same day. Happens on the third Friday of March, June, September, December. Volume on these days routinely exceeds the trailing 20-day average by 50-100%.
Practical takeaways
- High-conviction trades around heavily-optioned names benefit from awareness of weekly and monthly OpEx schedules
- Earnings releases scheduled near OpEx can produce especially volatile combined dynamics
- Volume patterns on OpEx days are not necessarily meaningful directional signal — they're often dealer-flow noise
Top Tier Newswire's earnings calendar surfaces every reporting company's expected timing (pre-market sun icon, post-market moon icon); combine that with public options-volume data for an integrated view.