** Shares of scientific instruments maker Spectris SXS.L up 5.6% at 3,334 pence

** Among top gainers on FTSE mid-cap index .FTMC which is up 0.2%

** Co on Friday rejected takeover proposal from private equity (PE) firm KKR KKR.N, days after it backed a possible competing $5 billion bid from PE Advent

** SXS did not provide details on KKR's proposal, first reported by the Wall Street Journal

** As of last close, stock gained ~26% so far this year

(Reporting by DhanushVignesh Babu in Bengaluru)

((DhanushVignesh.Babu@thomsonreuters.com;))