The online mortgage provider currently has large short bets placed against it by hedge funds. : Shares of Rocket Companies rallied more than 20% Tuesday in a surprising move on no apparent new news. The online mortgage provider currently has large short bets placed against it by hedge funds and appears to have garnered some bullish interest from day traders on Reddit's infamous WallStreetBets. Nearly 40% of its available shares are sold short and it is near the top of the list of U.S. companies in terms of size of short bet by hedge funds, according to FactSet.