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Gamma Dynamics in Options Trading: A Deep Dive into Long and Short Gamma

• By GammaHQ Team
Gamma Dynamics in Options Trading: A Deep Dive into Long and Short Gamma

Gamma isn’t static. It changes with time, volatility, and moneyness. Understanding these dynamics is essential for reading the options market.

How Gamma Changes with Expiry

As options approach expiration, gamma concentrates in at-the-money strikes. Deep in-the-money and out-of-the-money options have relatively low gamma. But ATM options — especially near expiry — can have extremely high gamma.

This means that as expiry approaches, the hedging pressure from dealers (who are typically short gamma) becomes more concentrated around the spot price. Small moves in the underlying force large delta adjustments. That’s why you often see prices gravitate toward high-open-interest strikes in the final days before expiration — the “gamma pin” or “max pain” effect.

Long Gamma Behaviour

When you’re long gamma, you want movement. Your delta increases when the market moves in your favour and decreases when it moves against you. You’re effectively buying low and selling high as the market oscillates.

Market participants who are long gamma include:

  • Retail option buyers (calls and puts)
  • Volatility funds that buy options
  • Some systematic strategies that are net long volatility

When the market is dominated by long gamma, moves tend to be dampened. Long gamma holders buy when price falls and sell when price rises — stabilising behaviour.

Short Gamma Behaviour

When you’re short gamma, you want the market to stay still. Your delta moves against you when the underlying moves. You must hedge by buying when price rises and selling when price falls — which amplifies the move.

Market participants who are short gamma include:

  • Market makers and dealers who sell options
  • Covered call writers
  • Short volatility funds

When the market is dominated by short gamma, moves can accelerate. Dealers hedging their short gamma buy into rallies and sell into selloffs — destabilising behaviour. This is the “gamma squeeze” or “volatility spike” dynamic.

The Expiry Effect

In the week of expiration, gamma dynamics intensify. Dealers’ short gamma positions become more sensitive. A move through a key strike can trigger cascading hedging. This is why expiry weeks often see increased volatility and more pronounced pinning or breakout behaviour.

Understanding these dynamics helps you anticipate when the market is likely to trend (short gamma dominant) versus mean-revert (long gamma dominant), and how that changes as expiry approaches.

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