Hedge Funds Ramp Up Bets Against Jupiter Fund Management (CityAM.com) Hedge funds have increased their bets against Jupiter Fund Management making it one of the most shorted UK companies. The asset manager’s shorted stock has increased to 10.55 per cent, more than that of struggling firms such as AA and Marks & Spencer, from 7.37 per cent at the beginning of April. At the beginning of this year Jupiter’s short position was 2.54 per cent, according to the latest data from Shorttracker. Marshall Wace, GLG Partners, Wellington Management Company, Point72 Asset Management and Melqart Asset Management have all increased their bets against the company in the last two months.