The sell-off in AI-related stocks pushed the Cboe Volatility Index (VIX) above 22 for the first time in four months.
Investors bought November VIX calls in several large trades, including 9,200 of the November 18, 20-strike calls for $1.7 million and 12,500 of the November 18, 23-strike calls for $1.1 million.
The market faces a key test next week when Tesla, SpaceX and Meta report earnings.