Acadian Asset Management’s Zhe Chen was among the sharemarket’s biggest winners when Guzman y Gomez’s share price tanked nearly 20 per cent on the day of its earnings results this month.

The 39-year-old’s Australian Equity Long Short fund, which uses artificial intelligence to process millions of data points each day from a pool of roughly 1000 stocks, jumped into the Mexican fast food chain and built a short position just before the earnings call on August 22.