** Shares of card issuer Marqeta MQ.O fall 39.5% to $3.6
** KeyBanc downgrades MQ to "sector weight" from
"overweight" rating, citing substantial revision of 2024 profit
forecast and initial 2025 growth to be below Wall Street
estimates
** Brokerage says regulatory scrutiny of Marqeta bank
partners has created log-jam of new card programs
** 6 of 17 brokerages rate MQ stock "buy" or higher, 11
"hold"; their median PT is $5 - LSEG data
** Including session's moves, stock down ~47.4% YTD
(Reporting by Prakhar Srivastava in Bengaluru)
((Prakhar.srivastava2@thomsonreuters.com))