Big 5 Sporting Goods Corp. has joined Standard & Poor's SmallCap 600. The retailer will replace Kronos Inc., which is being acquired by Hellman & Friedman Capital Partners VI, L.P. in a deal that is still pending final approvals.

Big 5 will be added to the S&P SmallCap 600 GICS (Global Industry Classification Standard) Specialty Stores Sub-Industry index.

The retailer will join the index pending approval of the Kronos transaction.