** Shares of Replimune REPL.O plunge 56% to $2.09 premarket
** J.P. Morgan downgrades biotech firm's stock to "underweight" from "neutral", withdraws price target of $10
** JPM says the U.S. Food and Drug Administration's second complete response letter $(CRL)$ highlights concerns over design of REPL's trials for its drug to treat advanced skin cancer
** The CRL creates "greater uncertainty" over the prospects of the therapy and whether data from the trials will be satisfactory for the FDA - brokerage
** Piper Sandler also downgrades stock to "neutral" from "overweight"
** The regulator declined to approve REPL's drug for a second time on Friday, citing insufficient data from studies
** The second consecutive rejection sent the stock down more than 19% in the previous session
** Five analysts rate stock "buy" or higher, two "hold" and one "sell", median PT at $11.50 - data compiled by LSEG
** REPL has lost more than half its value since the beginning of 2026
(Reporting by Purvi Agarwal in Bengaluru)
((Purvi.Agarwal@thomsonreuters.com;))
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