LDK Solar Co., Ltd (ADR) (NYSE:LDK) was following solar stocks rally as China holds plan to increase capacity.

Canadian Solar Inc. (NASDAQ:CSIQ) gained after its 148 MW solar park PV project in southern Brandenburg, Germany was named the 2012 winner of the Solar Project of the Year Award by POWER-GEN International.

Clearwire Corporation (NASDAQ:CLWR) added 7.36% on receiving a new bid.

NuVasive, Inc. (NASDAQ:NUVA) surged on revenue guidance.

Global Payments Inc (NYSE:GPN) was on the rise after issuing forecast-beating second quarter results and lifted its annual profit forecast.

Seagate Technology PLC (NASDAQ:STX) jumped on improved second quarter sales guidance.

Hologic, Inc. (NASDAQ:HOLX) hit new high following a groundbreaking new study published in Radiology noticed that the addition of three dimensional (3D) mammography (breast tomosynthesis) screening technology to a 2D breast screening exam extensively improved cancer detection while cutting several false positives.

Danaher Corporation (NYSE:DHR) was another 52-week high achiever after its CEO commented on guidance.

Herbalife Ltd. (NYSE:HLF) got a boost after Dan Loeb’s Third Point declared stake.

More in the positive territory included North American Palladium Ltd (USA) (NYSEAMEX:PAL) , ON Semiconductor Corp. (NASDAQ:ONNN), First Solar, Inc. (NASDAQ:FSLR), Aeropostale, Inc. (NYSE:ARO) and Facebook Inc (NASDAQ:FB)

On the flip side, School Specialty, Inc. (NASDAQ:SCHS) tumbled to worst level in its history after stating that it was in constructive talks with their key lenders about ways to put the company on more sound financial footing by addressing their financial needs and improving their financial position and capital structure.

Apollo Group Inc (NASDAQ:APOL) plunged 10.7% after reducing fiscal 2013 forecast.

Cell Therapeutics Inc (NASDAQ:CTIC) fell about 9% after kicking off clinical trial sites and started registering patients in a Phase 3 clinical trial, known as PERSIST-1 or PAC325, for pacritinib.

Crosstex Energy, L.P. (NASDAQ:XTEX) was down after announcing pricing of ordinary shares.

Chatham Lodging Trust (NYSE:CLDT) also declined after pricing public offering of common units.

ArcelorMittal (ADR) (NYSE:MT) was down, at last check, after unveiling a plan to sell $3.5 billion in shares, notes to reduce loan.

The Western Union Company (NYSE:WU) fell after signing a five-year deal with Safeway Inc.

Health Management Associates, Inc. (NYSE:HMA) opened lower today after Raymond James reduced the stock from an “outperform” rating to a “market perform” rating.

J.C. Penney Company, Inc. (NYSE:JCP) was under pressure on a downgrade from an “outperform” rating to a “neutral” rating at Macquarie.

SYSCO Corporation (NYSE:SYY) dropped following appointment of two new top Houston executives. The stock has recently been downgraded from Equal-weight to Underweight at Morgan Stanley citing rise in food inflation.

Some other stocks in red were Southwestern Energy Company (NYSE:SWN), Goldcorp Inc. (USA) (NYSE:GG), Chimera Investment Corporation (NYSE:CIM) and Arena Pharmaceuticals, Inc. (NASDAQ:ARNA).