How Large Crypto Options Expirations Affect Gamma, Volatility, and Volume
Summary
The article explains how large concentrations of open interest near expiry can affect options and underlying markets. At-the-money options have especially high gamma close to expiration, so small underlying price moves can sharply change their deltas. Short-gamma traders may pay to reduce exposure, contributing to higher implied volatility. Effects on realized volatility depend on market-maker positioning: short-gamma hedging can amplify price moves, while long-gamma hedging can encourage buying dips and selling rallies around concentrated strikes.
It describes estimating market-maker positioning by combining changes in open interest with trading volume and identifying which side initiated trades. The article uses data around the June 2020 expiry as an example, reporting higher implied volatility but little realized volatility, with different volume patterns for BTC and ETH. These inferences are probabilistic: the authors acknowledge that positioning cannot be known with certainty, and the reported event does not establish a universal effect for all expirations.
Key ideas
- Near-expiry at-the-money options have high gamma, making their deltas sensitive to underlying price moves.
- Short-gamma hedging can reinforce trends, while long-gamma hedging can dampen moves near heavily open strikes.
- Large expirations may raise implied volatility and trading volume even when realized volatility stays muted.
- Changes in open interest, trade volume, and aggressor side can help infer likely market-maker positioning.
- The positioning estimates are uncertain and the June 2020 example does not guarantee similar outcomes elsewhere.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.