** Customer experience firm Concentrix's CNXC.O shares rise ~35% to a six-month high of $61.73

** Stock set for biggest percentage gain on record

** On Wednesday, co reported Q1 adj profit of $2.79/share, above analysts' est of $2.58/share - LSEG

** Co posted Q1 sales of $2.37 bln vs analysts' est of $2.36 bln - LSEG

** Co expects Q2 sales between $2.37 bln and $2.39 bln; analysts expect Q2 sales to be $2.37 bln - LSEG

** Co forecast Q2 adj profit in the range of $2.69/share to $2.80/share; analysts expect Q2 adj profit to be $2.78/shr - LSEG

** Including session's moves, CNXC up 41% YTD

(Reporting by Kamal Choudhury in Bengaluru)

((Kamal.Choudhury@thomsonreuters.com;))