 Independent Bank Group Inc. NASD: IBTX will replace Progenics Pharmaceuticals Inc. NASD: PGNX in the SP; SmallCap 600 effective prior to the opening of trading on Monday, June 22. SP; Small-Cap 600 constituent Lantheus Holdings Inc. NASD: LNTH is acquiring Progenics Pharmaceuticals in a deal expected to be completed on or about June 19 pending final conditions. Post-acquisition, Lantheus Holdings will remain in SP; SmallCap 600. 