Bets against the value of Israeli companies spiked in the days before the October 7th Hamas attacks, suggesting some traders may have had advance knowledge of the looming terror attack and profited off it, according to new research released Monday. The preliminary research, which hasn’t been peer reviewed, is from law professors at Columbia University and New York University and details a “significant” and “unusual” spike five days before the attacks in short selling in the most popular fund linked to Israeli companies. Short selling is a way to bet against the value of a security.