UNITED STATES
Securities and Exchange Commission
Washington, D. C. 20549

Schedule 13G
Under the Securities Exchange Act of 1934

Cogent Communications Group Inc.
(Name of Issuer)

Common Stock
(Title and Class of Security)

19239V302
(CUSIP Number)

December 31, 2012
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [ X ]  Rule 13d-1(b)
         [     ]  Rule 13d-1(c)
         [     ]  Rule 13d-1(d)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
         1)     Name of reporting person:
                 Sarbit Advisory Services Inc.
		 (the "Investment Manager")

         2)     Check the appropriate box if a member of a group:
                  a)     n/a
                  b)     x

         3)     SEC use only

         4)     Place of organization:
                  Winnipeg, Manitoba, Canada

Number of shares beneficially owned by each reporting person with:
         5)     Sole voting power:          2,757,602
         6)     Shared voting power:        - 0 -
         7)     Sole dispositive power:     2,757,602
         8)     Shared dispositive power:   - 0 -

         9)    Aggregate amount beneficially owned by each reporting person:
                  2,757,602

         10)  Check if the aggregate amount in row (9) excludes certain shares:
                  n/a

         11)  Percent of class represented by amount in row (9):
                  5.85%

         12)  Type of reporting person:
                  IA
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

         Item 1a)     Name of issuer:
          		    Cogent Communications Group Inc.

         Item 1b)     Address of issuer's principal executive offices:
                    	1015 31st STreet N.W.
		    	Washington, D.C. 20007

          Item 2a)    Name of person filing:
                 	    Sarbit Advisory Services Inc.

         Item 2b)    Address of principal business office:
                           Sarbit Advisory Services Inc.
		   	   100 - 1 Evergreen Place
		   	   Winnipeg, MB, R3L 0E9

         Item 2c)    Citizenship:
                      	   Federal - Canada

         Item 2d)    Title of class of securities:
                           Common Shares

         Item 2e)    CUSIP No. 19239V302

         Item 3)  If this statement is filed pursuant to Rule 13d-1(b), or
13d-2(b), check whether the person filing is a :
         (a)[   ] Broker or dealer under Section 15 of the Act.
         (b)[   ] Bank as defined in Section 3(a)(6) of the Act.
         (c)[   ] Insurance Company as defined in Section 3(a)(6) of the Act.
         (d)[   ] Investment Company registered under Section 8 of the
         Investment Company Act.
         (e)[   ] Investment Adviser registered under Section 203 of the
         Investment Advisers Act of 1940.
         (f)[   ] Employee Benefit Plan, Pension Fund which is subject to
         ERISA of 1974 or Endowment Funds; see 240.13d-1(b)(ii)(F).
         (g)[   ] Parent holding company, in accordance with 240.13d-1(b)(ii)(G)
         (h) [ ]  Group, in accordance with 240.13d-1(b)(1)(ii)(J).

         Item 4)    Ownership:

         (a)     Amount beneficially owned:             2,757,602

         (b)     Percent of Class:  5.85%

         (c)     Number of shares as to which such person has:
                  (i)   sole power to vote or to direct the vote:
                                    2,757,602
                  (ii)  shared power to vote or to direct the vote:
                                    -  0 -
                  (iii) sole power to dispose or to direct the disposition of:
                                    2,757,602

                  (iv)  shared power to dispose or to direct the disposition of:
                                    -  0 -

         Item 5)    Ownership of Five Percent or less of a class:
                           n/a

         Item 6)    Ownership of more than Five Percent on behalf of another
         person:
	                  x

         Item 7)    Identification and classification of the subsidiary which
 acquired the security being reported on by the parent holding company:
                           n/a

         Item 8)    Identification and classification of members of the group:
                           n/a

         Item 9)    Notice of dissolution of group:
                           n/a

         Item 10)   Certification:

                  By signing below I certify that, to the best of my knowledge
                  and belief, the securities referred to above were acquired and
                  are held in the ordinary course of business and were not
                  acquired and are not held for the purpose of or with the
                  effect of changing or influencing the control of the issuer of
                  the securities and were not acquired and are not held in
                  connection with or as a participant in any transaction having
                  that purpose or effect.


                                                     Signature
                                                    -----------

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

         --------------------------------
         Date as of December 31, 2012

         Sarbit Advisory Services Inc.



         By___________________________________________
       		Lawrence A. Sarbit
                Chief Investment Officer