UK's Spire Healthcare climbs after report on investor push for sale

** Shares of British private hospital group Spire Healthcare SPI up 5.3% at 219p

** Stock among top gainers in FTSE mid-250 index MCX which is up 4.98% YTD

** Leading investors of SPI, including activist investment trust Achilles AIC, are urging co to put itself up for sale, Sky News reported

** Harwood Capital Management entities, of which Achilles is a part, were among investors who believed firm was significantly undervalued, the report says

** Harwood Capital and Spire did not immediately respond to Reuters request for comment

** Including session's losses, stock down ~1.12% YTD