The S&P 500 blew past 6,500 on April 1, tacking on roughly 100 points in a single session. The engine behind the move wasn’t just strong earnings or renewed investor confidence. It was the options market, where a torrent of call buying triggered a textbook gamma squeeze that forced market makers to keep buying stocks whether they wanted to or not.
Options trading volume hit $2.6 trillion in notional value, heavily skewed toward calls.
How a gamma squeeze turns options into rocket fuel
When traders buy call options, the dealers who sell those contracts need to hedge their exposure. They do this by purchasing the underlying stocks. The more the stock rises, the more shares dealers need to buy to stay hedged. That buying pushes prices higher still, which forces even more hedging purchases.
In technical terms, dealers were sitting on short gamma positions, meaning they were exposed to accelerating losses if prices moved against them. Their only rational response was to buy into the rally, adding fuel to a fire that was already burning hot.
By May 8, net gamma exposure for the S&P 500 reached $107.18 billion. At that level, dealers had shifted to a net long gamma position, which generally acts as a stabilizer. When dealers are long gamma, they sell into rallies and buy into dips, smoothing out volatility rather than amplifying it.
AI optimism and geopolitical calm set the stage
Two macro factors gave traders the confidence to pile into calls. First, optimism around artificial intelligence gave institutional and retail investors a reason to bet on further upside. Second, easing tensions between the US and Iran reduced geopolitical risk and freed up risk appetite across the board. Corporate earnings added a third pillar of support, giving fundamental cover to a rally that might otherwise have looked purely technical.
What this means for investors
The shift to positive net gamma at $107.18 billion is meaningful for near-term market behavior. With dealers now long gamma, price swings should be dampened as dealers lean against moves in both directions.
Experts have flagged that once the current options driving the gamma squeeze expire, the market may be vulnerable to increased volatility if negative developments arise. Volatility that was suppressed by long gamma positioning could snap back rapidly.
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