One of the last oil hedge funds standing has become a high-profile victim of the recent rout in crude prices.

Pierre Andurand, who earlier in 2018 predicted oil could soon hit $100 a barrel, suffered the largest-ever monthly loss of his flagship fund in October. The $1bn Andurand Commodities Fund lost 20.9% last month, taking the fund down more than 12% for the year, according to numbers sent to investors and reviewed by The Wall Street Journal.