Options Expiry
The date on which options contracts expire and become worthless or are settled — a source of predictable market volatility as dealers adjust their hedges, particularly at quarterly "quad witching" events.
The macro regime is unambiguously STAGFLATION DEEPENING. The three-pillar structure remains intact and strengthening: (1) Energy-driven inflation shock — WTI at $104-111, +40% in 1M, flowing through PPI (+0.7% 3M, accelerating) into a CPI/PCE pipeline that has not yet absorbed the full pass-through,…
What Is Options Expiry?
Options contracts have a fixed expiry date after which they are either exercised (if in-the-money) or expire worthless. The most commonly traded equity options expire on the third Friday of each month, with especially large expirations quarterly (March, June, September, December).
The Market Impact of Expiry
As expiration approaches, three forces shape market dynamics:
1. Gamma decay: Options' gamma — their sensitivity to price moves — spikes as expiry nears. This means dealers must rebalance their hedges more aggressively for a given price move, amplifying intraday volatility.
2. Pinning: Large open interest at specific strikes can cause the underlying to "pin" near those strikes as expiry approaches. Dealers hedging their short gamma positions buy near that strike as price approaches and sell as it rises above — a mean-reverting force.
3. Dealer de-hedging: After expiry, options positions disappear and dealers no longer need to maintain their hedges. The removal of this hedging flow can cause a directional move — typically in the direction the market was trying to move pre-expiry.
Quad Witching
Quad witching (the simultaneous expiry of stock index futures, stock index options, individual stock options, and single-stock futures) happens four times per year on the third Friday of March, June, September, and December. These are the highest-volume and most volatile options expiry events of the year.
0DTE Options
The rise of zero-days-to-expiry (0DTE) options on the S&P 500 has dramatically increased the daily gamma flows affecting the market. SPX 0DTE options now account for over 50% of daily S&P 500 options volume, creating constant intraday flows that can amplify or dampen moves depending on where the index is relative to large open interest strikes.
What to Watch Before OpEx
- The largest open interest strikes on SPX/SPY
- Whether dealers are net long or short gamma at current index levels
- The "max pain" level — the price at which the most options expire worthless
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