NEW YORK (TheStreet) -- Optimer Pharmaceuticals (OPTR) was spiking by 4.9% to $13.61 after the company received approval from the Food and Drug Administration for its Dificid anti-bacterial drug for the treatment of clostridium difficile-associated diarrhea in adults 18 years of age and older.

Chemical company

Ashland

(ASH) - Get Report

was rising 3% to $63.05 after saying Tuesday

it will acquire privately owned International Specialty Products for about $3.2 billion in cash.

Semiconductor company

Avago Technologies

(AVGO) - Get Report

was falling 2.6% to $34.10 as it announced the sale of 25 million ordinary shares by certain existing shareholders to

Deutsche Bank Securities

,

Barclays Capital

and

Citi.

Intel

(INTC) - Get Report

was rising 1.5% to $22.54 in premarket trading Tuesday as

The Financial Times

reported that the chipmaker was getting ready to unveil its vision for a new class of mobile computers that it hopes could take over from netbooks, as it moves to

defend its core PC market against the threat from tablets.

SeaDrill Limited

(SDRL) - Get Report

was rising 1.2% to $36 as the Bermuda-based offshore drilling contractor announced that it has been awarded a new contract by petroleum exploration and production company

PTTEP

in Thailand for the jack-up rig, West Leda. The contract is for nine-months and worth about $35 million. The contract may be extended by six months.

Citigroup

(C) - Get Report

was rising 1% to $41.36 as

Reuters

reported that the financial services company plans to expand its Asia markets division by hiring 150 people this year.

Sony

(SNE) - Get Report

was trading sideways at $26.83 after saying Tuesday it will

restore services of its PlayStation Network

in all regions except Japan, Hong Kong and South Korea by the end of the week.

Medical devices company

Boston Scientific

(BSX) - Get Report

was flat at $7.04 as it recalled more than 29,000 of its iCross Coronary Imaging Catheters due to complaints about detachments of the catheter tip.

Apparel company

Phillips-Van Heusen

(PVH) - Get Report

is expected by analysts to report first-quarter profit of $1.16 a share after the markets close Tuesday.

Game publisher

Activision Blizzard

(ATVI) - Get Report

plans to introduce an online service called Call of Duty Elite this fall and charge a monthly subscription fee for it, the

Wall Street Journal

reported.

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