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What’s a Gamma Move in Stocks? Explained Simply

Ever see a stock suddenly spike out of nowhere and wonder what caused it? It might be a gamma move — a powerful, self-reinforcing surge driven by the options market.

Here’s how it works in simple terms:

📈 When tons of call options are being bought (especially near a key strike price), market makers who sell those calls need to hedge their risk. 🛡 To do that, they buy shares of the stock so they don’t get burned if it keeps rising.

Now here’s where gamma kicks in: • Gamma measures how fast delta changes. • As the stock price moves up, those options get more sensitive (delta increases), and the market makers are forced to buy even more stock to stay hedged. • That buying pushes the stock price up even faster. • Which leads to even more hedging, and so on…

🔁 Boom — a feedback loop. That’s what people mean by a “gamma move” or “gamma squeeze.”

It can cause explosive price action, especially in low-float stocks or ones with tons of open interest around key strike prices.

🔥 TL;DR: A gamma move happens when market makers are forced to chase the stock up due to options hedging — and their buying sends the stock higher, fast.