Short Seller Carson Block Bets Against Major Credit ETFs, Citing AI Economic Risk

Prominent short seller Carson Block is taking a direct bearish position against major corporate credit exchange-traded funds (ETFs), positioning his firm to profit from a potential downturn he links to artificial intelligence. This move signals a high-conviction, non-traditional hedge against what Block perceives as a significant economic threat emanating from the AI sector, rather than conventional market cycles.

Block, founder of Muddy Waters Research, is specifically targeting some of the largest and most liquid credit ETFs. His strategy involves shorting these funds, which bundle corporate bonds, as a proxy bet against broader corporate health. The core of his thesis hinges on the fear that the rapid adoption and capital allocation toward AI could precipitate a wider economic slowdown or dislocation, negatively impacting corporate borrowers and, by extension, the debt they have issued.

This trade places Block at the intersection of several high-pressure points: the overheated AI investment landscape, the corporate debt market, and the ETF structure that amplifies both gains and losses. While not predicting an immediate crash, the bet represents a stark warning from a seasoned market operator. It raises scrutiny on whether the AI boom could create unforeseen systemic risks, turning the credit market—often seen as a barometer of economic stability—into a focal point for speculative pressure and potential volatility.