美国制裁俄油企颠覆油市预期，对冲基金因巨量空头头寸踏空上涨行情

Group 1 - Hedge funds holding record short positions in Brent crude oil failed to capitalize on the recent price increase [1] - As of October 21, hedge fund managers increased their short positions in Brent crude oil by 40,233 contracts to a historical high of 197,868 contracts [1] - The market had anticipated an oversupply of crude oil, evidenced by rising offshore oil inventories, leading to a bearish stance among hedge funds [1] Group 2 - The U.S. government imposed sanctions on Russian oil giants Rosneft and Lukoil, disrupting market expectations and potentially supporting oil prices [1] - The sanctions could lead to a reduction of up to 600,000 barrels per day in Russian oil production, alleviating the oversupply situation [1] - The U.S. government shutdown has halted the release of the weekly U.S. crude oil inventory report, making the recent trading data particularly significant for market sentiment analysis [2]