** Crescent Energy's shares jump 10% to $12.29 on Weds as co poised to join S&P SmallCap 600 index this week

** CRGY hits over 2-mth high and on track for biggest one-day pct gain since May 7

** Houston-based oil and gas producer to join SPCY effective before market open on Fri (Oct 4), S&P Dow Jones said after the bell Tues

** Crescent to replace digital consultancy firm Perficient Inc , which is being acquired by Swedish private equity firm EQT AB

** Even with gain on the session, CRGY down 7% YTD

** 8 of 10 analysts covering stock rate it "strong buy" or "buy", rest "hold" with median PT of $16, down from $18 a month ago, per LSEG data

(Lance Tupper is a Reuters market analyst. The views expressed are his own)

((lance.tupper@thomsonreuters.com lance.tupper@tr.com 1-646-279-6380))