BJ’s Wholesale, Molycorp, Sears, Ultralife

Advancers
BJ’s Wholesale Club Inc. /quotes/comstock/13*!bj/quotes/nls/bj (BJ 47.62, +3.15, +7.08%)  shares rose 7% after the New York Post cited unnamed sources in reporting buyout firm Leonard Green & Partners LP might make a hostile bid for the warehouse-store operator.

GenVec Inc. /quotes/comstock/15*!gnvc/quotes/nls/gnvc (GNVC 0.58, +0.03, +5.45%)  shares gained 5.5% after the biotechnology company said it would work with Merial, a producer of vaccine for foot-and-mouth disease, to develop and market its own technology for a vaccine.

Molycorp Inc. /quotes/comstock/13*!mcp/quotes/nls/mcp (MCP 49.30, +3.12, +6.76%)  shares gained almost 7% with the rare-earth mine operator rising after China cut export quotas of minerals used in making high-technology goods including electric cars and wireless phones. Other mineral-producers also rose, with Lynas Corp. /quotes/comstock/11i!lyscf (LYSCF 2.00, +0.27, +15.61%)  up 15.6%, China Rare Earth Holdings Ltd. /quotes/comstock/11i!creqf (CREQF 0.51, +0.10, +22.89%)  rising 23% and Arafura Resources Ltd. /quotes/comstock/11i!araff (ARAFF 1.48, +0.20, +15.63%)  up more than 15%.

Pulse Electronics Corp. /quotes/comstock/13*!puls/quotes/nls/puls (PULS 5.45, +1.09, +25.00%)  rose 25% after the electronics manufacturer said it received notice from Bel Fuse Inc. that it would nominate three candidates to its board, following up on its recent expression of interest about a possible combining of businesses.

RightNow Technologies Inc. /quotes/comstock/15*!rnow/quotes/nls/rnow (RNOW 23.51, +3.72, +18.80%)  shares climbed almost 19% after Piper Jaffray upgraded its rating on the customer relations-management software provider from neutral to overweight.

Sears Holdings Corp. /quotes/comstock/15*!shld/quotes/nls/shld (SHLD 74.49, +4.47, +6.38%)  shares were up 6.4% after Sonic Solutions /quotes/comstock/15*!snic/quotes/nls/snic (SNIC 15.02, +0.18, +1.21%)  said the retailer had launched its online film service using its RoxioNow platform.

Decliners

Dara BioSciences Inc. /quotes/comstock/15*!dara/quotes/nls/dara (DARA 2.78, -0.33, -10.61%)  fell 10.6% after the drug developer said it would sell up to $4 million in shares and warrants.

Ultralife Corp. /quotes/comstock/15*!ulbi/quotes/nls/ulbi (ULBI 6.09, -0.98, -13.86%)  shares were down almost 14% after the seller of batteries and communication products reduced its full-year revenue outlook.