Short Seller Andrew Left Bets Against Stocks in Quantum Trade

Andrew Left, known for his high-profile bets against some of the market’s hottest stocks, is targeting Palantir as well as leading quantum computing companies, Samuel O’Brien reported for Business Insider.

Left’s bearish stance on Rigetti stems from the company’s high R&D costs in quantum development. (Photo: Citron Research) 

A prominent short-seller during the 2021 GameStop mania, Left recently disclosed a short position against Palantir, one of the top AI stocks this year.

He is also bearish on quantum companies Rigetti Computing and D-Wave, whose shares have risen 78% and 214%, respectively, in 2025.

Left’s bearish stance on Rigetti stems from the company’s high R&D costs in quantum development. Citron Research, Left’s firm, criticized Rigetti as early as December last year, when its stock was under $10 per share.

“What have we learned about technology over the past four years?” Left mused. “We’ve learned that it’s expensive, that lead times mean everything, and that talent means everything.”