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Jane Street’s reported ~$15B July loss matters less as a verdict on AI than as a stress test for positioning. With year-to-date net trading revenue still above $40B, the firm does not appear to face an operating crisis. The sharper signal is that a crowded theme can transmit volatility beyond equities when leveraged funds and trading books share similar exposures. If losses force concentrated position cuts, liquidity may become more important than valuation in determining the next leg of the tech selloff. That feedback risk deserves attention, but deleveraging should not be assumed without evidence. Not advice, just analysis. #AIBetHitsJaneStreet