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 * SCHAEFFER DAVE   2. Issuer Name and Ticker or Trading Symbol COGENT COMMUNICATIONS GROUP INC [COI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman & CEO (Last) (First) (Middle) 1015 31ST ST., NW 3. Date of Earliest Transaction (Month/Day/Year) 11/04/2005 (Street) WASHINGTON, DC 20007 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 11/04/2005(1)   A(1)   100,000 (1) A $ 0 1,864,843 (2) D

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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

Option to purchase common stock (3)

$ 0

11/01/2006(3)

09/08/2014

common stock (3)

576,930

576,930 (3)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SCHAEFFER DAVE 1015 31ST ST., NW WASHINGTON, DC 20007	X		Chairman & CEO

Signatures

David Schaeffer		11/07/2005
**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 November 4, 2005 the Board of Directors of the Company approved a grant to Mr. Schaeffer of 100,000 shares of common stock of the Company. The shares are subject to certain vesting restrictions as follows: 8,333.33 shares are vested on January 1, 2006 and an additional 8,333.33 shares vest on the first day of each subsequent month of 2006. Vesting will accelerate under certain circumstances, including a change of control of the Company. The Company will receive no consideration for this stock and the grant is treated as compensation to Mr. Schaeffer.
(2)	This amount includes 1,764,843 shares owned by Mr. Schaeffer as perviously reported on form 3 and various forms 4; 1,181,296 of these shares are vested and the remainder are subject to vesting through August 1, 2006. This amount also includes the 100,000 shares granted to him on October 26, 2005 and the 100,000 shares granted to him on November 4, 2005. This amount also includes 6,750 shares that are held by Mr. Schaeffer's Descendant's Trust. Mr. Schaeffer disclaims beneficial ownership of such shares. All share amounts reflect the 1-for-20 reverse stock split effected by the Company on March 23, 2005.
(3)	On February 15, 2005 Mr. Schaeffer's option to acquire 15,000 shares of Series H Convertible Preferred Stock was converted by action of the stockholders into an option to acquire 11,538,461 shares of common stock at a rate of 769.2307692 shares of common stock for each shares of Series H Preferred Stock. The Company's 1-for-20 reverse stock split effected on March 23, 2005 further converted the original option grant into an option to acquire 576,930 shares of common stock. The common stock is subject to the same vesting provisions applicable to the original option to acquire Series H Preferred Stock: 100% of the option will vest on November 1, 2006; vesting will accelerate under certain circumstances and is exercisable for a period of 10 years from date of grant on September 8, 2004.

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