[Castle Securities Stock Strategy Chief Expects Short Squeeze to Drive S&P 500 Index Surge] According to a report by Jinse Finance, on March 24, Scott Rubner, the head of stock and equity derivatives strategy at Castle Securities, stated that record short positions in the U.S. stock market face the risk of being covered, potentially leading to a market rebound. Hedge funds and systematic strategy funds are expected to become the main force behind the next wave of buying.