The top after-market NASDAQ Stock Market gainers are: Velti, China-Biotics, Oncothyreon, Synovis Life Technologies, and Inter Parfums. The top after-market NASDAQ Stock Market losers are: Park Sterling Bank, Charming Shoppes, Books-A-Million, CoStar Group, Exterran Partners, and Compuware.

Gainers

Velti Plc (VELT) stock grew 6.04 percent to $18.97 in the after-market trading.

China-Biotics, Inc. (CHBT) stock gained 5.33 percent to $8.30 in the after-market trading.

Oncothyreon Inc (ONTY) stock increased 4.19 percent to $6.22 in the after-market trading. The company said it has initiated the Phase 2 portion of its ongoing Phase 1/2 trial of PX-866 in combination with the chimeric monoclonal antibody cetuximab (Erbitux) following successful completion of the Phase 1 dose escalation portion of the study. PX-866 is a small molecule compound designed to inhibit the activity of phosphatidylinositol-3-kinase (PI-3K), a component of an important cell survival signaling pathway.

Oncothyreon said up to 144 patients may be enrolled in the Phase 2 portion of the study, including 72 (36 per arm) in each group. The primary endpoint of the Phase 2 portion is objective response rate based on RECIST criteria. Secondary endpoints include progression free and overall survival, duration of response and disease control rate.

Synovis Life Technologies Inc. (SYNO) stock gained 3.15 percent to $20.33 in the after-market trading, ahead of its second quarter earnings release on May 25 before the market opens. Street are expecting Synovis to earn $0.14 per share on revenue of $21.21 million for the second quarter, compared to last year's profit of $0.11 per share on revenue of $17.60 million.

Inter Parfums Inc. (IPAR) stock increased 2.86 percent to $21.24 in the after-market trading. Standard & Poor's said Inter Parfums will replace Triumph Group Inc. (TGI) in the S&P SmallCap 600 index after the close of trading on May 31.

Losers

Park Sterling Bank Inc. (PSTB) stock plunged 21.51 percent to $3.65 in the after-market trading.

Charming Shoppes Inc. (CHRS) stock plummeted 13.11 percent to $3.38 in the after-market trading.

Books-A-Million Inc. (BAMM) stock fell 7.24 percent to $4.10 in the after-market trading. Loss for the first quarter was $3.5 million or $0.22 per share, compared to a profit of $2.0 million or $0.13 per share last year. Sales fell 11.1 percent to $104 million. Comparable store sales decreased 13.2 percent.

Results for the quarter reflect a very challenging retail calendar, the growing effect of e-book penetration and, at the end of the quarter, the effects of the devastating tornado outbreak that hit our region. Bargain books, electronics, media and gift businesses continue to grow, and we remain committed to diversifying our assortment to build these exciting categories. Our balance sheet remains strong, and we are well-positioned to take advantage of the opportunities that lie ahead, said Clyde Anderson, Chairman, President and Chief Executive Officer of Books-A-Million.

CoStar Group Inc. (CSGP) stock tumbled 6.08 percent to $59.75 in the after-market trading.

Exterran Partners, L.P. (EXLP) stock slid 4.13 percent to $25.75 in the after-market trading. The company said it commenced an underwritten public offering of 5 million common units representing limited partner interests. The Partnership has also granted the underwriters a 30-day option to purchase up to an aggregate of 750,000 additional common units to cover over-allotments, if any.

The Partnership said it intends to use the net proceeds of the offering to repay about $61.5 million of borrowings outstanding under its revolving credit facility and for general partnership purposes, including to fund a portion of the consideration for the previously announced acquisition of compression and processing assets from Exterran Holdings, Inc. pursuant to that certain Contribution, Conveyance and Assumption Agreement, dated as of May 23, if consummated.

Compuware Corp. (CPWR) stock declined 3.75 percent to $10 in the after-market trading. Profit for the fourth quarter was $34.8 million or $0.16 per share, compared to $37.4 million or $0.16 per share last year. Revenue rose to $249.6 million from $230 million. Analysts had expected profit of $0.14 per share on revenue of $250.20 million.

Combined with our laser focus on profitability in Mainframe Solutions, Professional Services and Uniface, we have positioned Compuware to deliver increases in revenues, earnings per share and operating cash flow for fiscal 2012, said Bob Paul, Chief Operating Officer of Compuware.