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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
949428	Clean Diesel Technologies Inc	CDTI	Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)	061393453

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1044321	M David Greenhouse & W Austin Marxe	C/O Special Situations Funds 527 Madison Avenue, Suite 2600 New York NY 10022		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2011-10-26	6,145	$3.91	1,385,040	No	4	S	Indirect	By Limited Partnership
Common Stock	Disposition	2011-10-27	40,400	$3.92	1,344,640	No	4	S	Indirect	By Limited Partnership
Common Stock	Disposition	2011-10-28	3,000	$3.65	1,341,640	No	4	S	Indirect	By Limited Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Limited Partnership
No	4	S	Indirect	By Limited Partnership
No	4	S	Indirect	By Limited Partnership

Footnotes

This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, L.P. (PE), Special Situations Technology Fund, LP. (TN) and Special Situations Technology Fund II, L.P. (T2). 670,819 shares of Common Stock are held by QP, 214,663 shares of Common Stock are held by Cayman, 84,158 shares of Common Stock are held by PE, 51,836 shares of Common Stock are held by TN and 320,164 shares of Common Stock are held by T2. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, PE, TN and T2 is limited to the extent of his pecuniary interest.