** Shares of British private hospital group Spire Healthcare SPI.L fall 21.6% to 149p, its lowest since December 2020
** Stock on track for its worst day since July 2018 if losses hold; top loser on FTSE midcap index .FTMC, which is down 2.4%
** Buyout talks with Bridgepoint and Triton end; parties say they have no intention to make an offer for SPI
** SPI says still in discussions with other parties for a potential sale
** YTD, stock is down ~10%
(Reporting by Neeshita Beura in Bengaluru)
((Neeshita.Beura@thomsonreuters.com))