** Shares of insurer MetLife MET.N fall 1.2% to $78.11 in premarket trading
** Piper Sandler downgrades stock rating to "neutral" from "overweight"
** Brokerage says as interest rates rise, competition among institutions that earn money from interest rate differences is expected to get tougher
** With more capital entering the market from alternative asset managers and mutual funds, MetLife’s positioning in the space could be challenged, brokerage says
** Stock rated "buy" on average; median PT is $93, per data compiled by LSEG
** As of last close, MET is down ~3.4% this year
(Reporting by Akriti Shah in Bengaluru)
((akriti.shah@thomsonreuters.com))