The mechanics of a reflexive GME short squeeze
The host argued that the 2021 GameStop short squeeze was a highly reflexive, self-reinforcing feedback loop driven by a simultaneous delta, gamma, and vanna squeeze.
The argument
The host explained that retail buying of out-of-the-money call options forced market makers to buy underlying shares to hedge. As implied volatility rose to extreme levels, the positive vanna of these options further increased dealer deltas, forcing mechanical buying of the stock that ultimately threatened systemic clearinghouse stability.
The thesis, stress-tested
✓ What validates it
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▸ Risks discussed
- ▸Extreme margin requirements and broker-imposed trading restrictions can abruptly break the feedback loop
- ▸High implied volatility makes options prohibitively expensive, leading to rapid decay if the stock's momentum slows
Hear it yourself
"The trader had bought a strip of options to hedge this swap trying to create a portfolio that had similar characteristics, namely gamma exposure that was independent of the spot price. With the stock at four on the trade date, he bought every strike in sight all the way up to 12, but GME traded 87 on 01/27/2021."
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