Benzinga's Volume Movers

Optimer Pharmaceuticals Inc OPTR shares surged 7.24% to $13.92 at 10:40 am. The volume of OPTR shares traded was 815% higher than normal. The US Food and Drug Administration (FDA) has approved its antibacterial drug Dificid to treat Clostridium difficile. The Medicines Company MDCO shares moved up 4.13% to $19.14. The volume of MDCO shares traded was 574% higher than normal. MDCO will replace RehabCare Group Inc RHB in the S&P SmallCap 600 index after the close of trading on June 1, 2011. Spartan Stores Inc SPTN shares rose 5.75% to $18.59. The volume of SPTN shares traded was 398% higher than normal. SPTN has a dividend yield of 1.50%. Gulf Island Fabrication Inc GIFI shares gained 9.34% to $33.13. The volume of GIFI shares traded was 337% higher than normal. GIFI had $62.14 million in total cash and no debt for the latest quarter. Read more from Benzinga's Markets.