(For faster updates on individual market-movers, Eikon users please use search string "STXBZ US"; for the Day Ahead newsletter, link.reuters.com/mex49s; for the Morning News Call newsletter, link.reuters.com/nex49s) U.S. stocks opened lower on Thursday on worries about the possibility of a Greek default and an unexpected rise in weekly jobless claims. The Dow Jones industrial average was down 0.34 percent at 18,101.86, the S&P 500 was down 0.33 percent at 2,116.48 and the Nasdaq Composite was down 7.06 points, or 0.14 percent, to 5,099.53.
** XOMA CORP, $3.41, +2.71 pct
The drug developer said an experimental drug for treating inflammation showed benefit in a late-stage trial, compared with the standard of care. The company said its development partner Servier would now analyze the data, with results of the main goal expected in seven weeks.
** KNOT OFFSHORE PARTNERS LP, $23.44, -5.33 pct
The tanker operator reported an offering of 5 million common units priced at $23.76 each, representing a 4 percent discount to the stock's Wednesday close. The offering size was 22.3 percent of Knot Offshore's total outstanding shares as of Dec. 30.
The company also said its unit would acquire Knot Shuttle Tankers 21 AS, which owns shuttle tanker Dan Sabia, from Knutsen NYK Offshore Tankers AS for $103 million.
** CTRIP.COM INTERNATIONAL LTD, $79.985, -1.88 pct
Some of China's largest online travel company's servers were hacked, causing disruptions to its website and mobile app, according to several media reports.
** DOLLAR GENERAL STORES INC, $73.15, +0.29 pct
The discount retailer said Chief Operating Officer Todd Vasos would replace Rick Dreiling as chief executive, effective June 3.
** BIOCEPT INC, $3.37, +12.33 pct
The molecular diagnostics company's liquid biopsy technology, which uses simple blood test, can help doctors make treatment decisions based on genomic information from patient's tumor, according to data presented at American Society of Clinical Oncology conference.
** ABERCROMBIE & FITCH CO, $21.3, +8.40 pct
The teen apparel retailer said it expects comparable sales to improve in the second half of the year as its Hollister line of clothing begins to show signs of improvement.
** SANDERSON FARMS INC, $80.76, -4.43 pct
The third-largest U.S. poultry producer, reported lower-than-expected quarterly net sales and profit, hurt by lower selling prices.
** NET ELEMENT INTERNATIONAL INC, $0.7234, +4.84 pct
The mobile payment company said it would buy online payment processor PayOnline for up to $8.4 million. PayOnline processes online payments for over 10 million consumers and thousands of merchants in the Russian Federation, Europe and Asia.
** EXPRESS INC, $17.78, +6.98 pct
The apparel retailer raised full-year adjusted profit forecast to $1.11-$1.22 per share from $0.93-$1.07. The company also reported better-than-expected first-quarter profit and sales as store traffic rises due to better apparel mix.
** AVAGO TECHNOLOGIES LTD, $137.83, -2.59 pct
** BROADCOM CORP, $55.09, -3.61 pct
Avago Technologies agreed to buy fellow chipmaker Broadcom in a cash-and-stock deal valued at $37 billion to boost its mobile chip and data networking businesses.
** RXI PHARMACEUTICALS CORP, $0.3499, -23.10 pct
The biotech company offered about 26 mln units and priced it at 40 cents a piece for net proceeds of about $9.3 mln
** JINKOSOLAR HOLDING CO LTD, $29.78, +4.86 pct
The Chinese solar panel maker's first-quarter net income attributable jumped to $8.2 mln from $1.5 mln, helped by higher revenue from its solar power plants business. Revenue rose nearly 37 pct to $443.5 mln.
** SEMTECH CORP, $22, -10.64 pct
B Riley downgraded the semiconductor maker's stock to "sell", according to theflyonthewall.com, and cut its price target to $21 from $26.
** WESTERN DIGITAL CORP, $99.02, +4.93 pct
Goldman Sachs upgraded the data storage company's stock "buy" from "neutral" and raised its price target to $122 from $106. Its analysts said they believe the company's current valuation doesn't fully recognize that its business model was benefiting from non-PC growth.
** SEADRILL LTD, $12.1, -4.95 pct
The world's second-biggest offshore oil driller, predicted years of pain for the global rig market as energy companies continue to pare spending despite a recent lift in oil prices.
** COSTCO WHOLESALE CORP, $143.6701, -1.20 pct
The warehouse club operator reported a decline in quarterly comparable sales and lower-than-expected sales, hurt by gasoline price deflation and a stronger dollar that reduced value of sales from overseas markets.
** ACTAVIS PLC, $311.09, +1.40 pct
** VALEANT PHARMACEUTICALS INTERNATIONAL INC, Wednesday close $239.12, +1.24 pct premarket
U.S. health regulators approved new irritable bowel syndrome drugs from Actavis and Valeant on Wednesday, validating big investments both companies made to acquire the products. (Reporting by Shubhankar Chakravorty in Bengaluru; Editing by Joyjeet Das)