** U.S. bank Truist Financial's TFC.N shares rise 1.9% to $44.26 premarket
** TD Cowen upgrades TFC to "buy" from "hold"; raises PT to $55 from $48, a 27% upside to stock's last close
** Brokerage says the bank has reached an inflection point with a multi-year investment plan signaling offense is now back on the field
** Adds that shares appear "substantially undervalued" given strong improvement ahead in return on tangible common equity - closely watched profitability target
** 11 of 23 brokerages rate the stock "buy" or higher and 12 "hold"; median PT $50 - data compiled by LSEG
** As of last close, TFC stock flat YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))