Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
GLASSMEYER EDWARD F
  2. Issuer Name and Ticker or Trading Symbol
COGENT COMMUNICATIONS GROUP INC [CCOI]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O OAK INVESTMENT PARTNERS, ONE GORHAM ISLAND
3. Date of Earliest Transaction (Month/Day/Year)
09/01/2006
(Street)

WESTPORT, CT 06880
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 09/01/2006   J(1)   750,000 D (1) 2,961,469 I See Note (4)
Common Stock               40,100 I See Note (3)
Common Stock               88,422 I See Note (2)
Common Stock               3,750 I See Note (5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GLASSMEYER EDWARD F
C/O OAK INVESTMENT PARTNERS
ONE GORHAM ISLAND
WESTPORT, CT 06880
  X      

Signatures

 Edward F. Glassmeyer   09/05/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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).
(1) On September 1, 2006, Oak Investment Partners IX, Limited Partnership ("Oak IX, L.P.") made an in-kind distribution, without any additional consideration, of Common Stock to the limited and general partners of Oak IX, L.P. In turn, the general partner made an in-kind distribution of the shares it received to its members.
(2) Represents shares directly owned by Oak Affiliates Fund - A, Limited Partnership ("Oak IX Affiliates - A, L.P.")
(3) Represents shares directly owned by Oak Affiliates Fund, Limited Partnership ("Oak IX Affiliates, L.P.")
(4) Represents shares directly owned by Oak IX, L.P.
(5) Represents shares directly owned by Oak Management Corporation ("OMC")
 
Remarks:
Remarks:

Mr. Glassmeyer is a director of Cogent Communications Group, Inc.; President of Oak Management Corporation; a Managing Member of Oak Associates IX, L.L.C., the General Partner of Oak IX, L.P.; and a Managing Member of Oak IX Affiliates, L.L.C., the General Partner of Oak IX Affiliates, L.P. and Oak IX Affiliates - A, L.P.

Each Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of any securities (except to the extent of such Reporting Person's pecuniary interest in such securities) other than any securities reported herein as being directly owned by such Reporting Person, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of any such securities for purposes of Section 16 or for any other purpose.

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