Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  ELLIS ALEXANDER III
 2. Date of Event Requiring Statement (Month/Day/Year)
10/15/2010		 3. Issuer Name and Ticker or Trading Symbol
CLEAN DIESEL TECHNOLOGIES INC [CDTI]
(Last)
(First)
(Middle)
C/O ROCKPORT CAPITAL PARTNERS, LP, 160 FEDERAL STREET, 18TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02110		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
No securities beneficially owned 0
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ELLIS ALEXANDER III
C/O ROCKPORT CAPITAL PARTNERS, LP
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
RockPort Capital Partners, L.P.
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
ROCKPORT CAPITAL I LLC
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
RP Co-Investment Fund I, L.P.
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
RP Co-Investment Fund I GP, LLC
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
James Janet Burrows
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
JAMES WILLIAM E
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
MCDERMOTT CHARLES J
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
Prend David J
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    
Wilson Stoddard Moran
160 FEDERAL STREET, 18TH FLOOR
BOSTON, MA 02110		   X   X    

Signatures

ALEXANDER ELLIS III, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
ROCKPORT CAPITAL PARTNERS, LP, By: Rockport Capital I, LLC, General Partner, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
RP CO-INVESTMENT FUND I, L.P., By: RP Co-Investment Fund I GP, LLC, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
ROCKPORT CAPITAL I, LLC, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
RP CO-INVESTMENT FUND I GP, LLC, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
JANET B. JAMES, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
WILLIAM E. JAMES, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
CHARLES J. MCDERMOTT, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
DAVID J. PREND, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date
STODDARD M. WILSON, By: /s/ Tom Scott, Attorney-in-Fact 10/19/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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