Shares of Rocket Companies dropped more than 20% Wednesday following a surprise rally in the previous session, as Wall Street analysts raised red flags on the frenzy trading.

The online mortgage provider’s stock came under pressure after soaring more than 70% Tuesday for its bear day ever with no apparent news. Rocket is one of the most heavily shorted names by hedge funds, with nearly 40% of its available shares sold short, which may have made it attractive to the Reddit trading crowd.