Major Gainers Of The Day – CDTI, AONE, ATML, GRPN, COG

Clean Diesel Technologies, Inc.(NASDAQ:CDTI) shares popped up 12.66% to $2.67 on very unusual volume after Honda (HMC) announces that it will begin selling its 2013 four and six-cylinder Accord models incorporating CDTI's palladium-only catalyst on September 19. The catalyst design significantly reduces precious metal content and cuts the use of Rhodium by 50%.

A123 Systems, Inc.(NASDAQ:AONE) extending gain for the second consecutive day and rose 22% to $0.285 in absence of any news. Shares are now up 50% on the week, though they're still changing hands at a paltry $0.30. It looks as if the shorts who control much of the electric car battery maker's float are booking some profits.

Atmel Corporation(NASDAQ:ATML) added 3% as well after announcing one of its touchscreen controllers is used in Samsung's (SSNLF.PK) Galaxy Note 10.1 tablet. The Note 10.1, which tries to differentiate itself by offering a stylus and a split-screen mode, has received mixed reviews. And its $499 price tag puts it at clear disadvantage to cheaper hardware from Amazon, Lenovo, and others.

Cabot Oil & Gas Corporation(NYSE:COG), Southwestern Energy Company(NYSE:SWN) and Range Resources Corp.(NYSE:RRC) as higher-growth mid-cap gas-levered names it believes will benefit from rising gas prices into 2013. Of the three, the firm notes COG has the highest-rate Marcellus wells, an achievable capital program, and compelling well results in the Eagle Ford. Shares of Cog are up over 5%, SWN rose 5% and RRC jumped 4.70%.

 Groupon Inc(NASDAQ:GRPN) is bouncing in the absence of major news; with shares still well below $5, the company's many shorts are free to book huge profits. Evercore's Ken Sena, who downgraded shares to Underweight last month, went on Bloomberg today (video) to discuss Groupon's dependence on up-front cash payments for daily deals billings to maintain positive cash flow, and the potential for cash flow to turn negative as billings drop. Shares of GRPN are now up 7%.