March 3 (Reuters) - Shares in mortgage lenders UWM Holdings Corp and Rocket Companies jumped in early deals on Wednesday, building on strong gains from the previous session, which was fueled by a short squeeze on Rocket’s stock. Rocket, parent of Quicken Loans, was up 6.2% at $44.12 in premarket trade, following Tuesday’s 71.5% surge. Its shares have doubled this week as it gained popularity on internet message boards as a short-squeeze candidate. Shares of UWM Holdings were trading 18.8% higher at $10.85. (Reporting by Aaron Saldanha in Bengaluru, Additonal reporting by Lance Tupper in New York; Editing by Arun Koyyur)