SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 --------- SCHEDULE 13G (RULE 13D-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13D-1(B) (C), AND (D) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2(B) (AMENDMENT NO._____)1 COGENT COMMUNICATIONS GROUP, INC. ----------------------------------------------------- (Name of Issuer) COMMON STOCK, PAR VALUE $0.001 PER SHARE ----------------------------------------------------- (Title of Class of Securities) 19239V104 ----------------------------------------------------- (CUSIP Number) FEBRUARY 5, 2002 ----------------------------------------------------- (Date of Event which requires filing of this Statement) Check the appropriate box to designate the Rule pursuant to which this Schedule is filed: /_/ Rule 13d-1(b) /_/ Rule 13d-1(c) /X/ Rule 13d-1(d) ---------- (1) The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Cusip No. 19239V104 13G Page 2 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak Investment Partners IX, Limited Partnership 06-1556218 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by 1,957,507 Shares of Common Stock Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power Not applicable ---------------------------------------------- (7) Sole Dispositive Power 1,957,507 Shares of Common Stock ---------------------------------------------- (8) Shared Dispositive Power Not applicable -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,957,507 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.25% -------------------------------------------------------------------------------- 12. Type of Reporting Person* PN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 3 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak Associates IX, LLC 06-1556230 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 1,957,507 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 1,957,507 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,957,507 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.25% -------------------------------------------------------------------------------- 12. Type of Reporting Person* OO-LLC -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 4 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak IX Affiliates Fund - A, Limited Partnership 06-1571899 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by 46,985 Shares of Common Stock Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power Not applicable ---------------------------------------------- (7) Sole Dispositive Power 46,985 Shares of Common Stock ---------------------------------------------- (8) Shared Dispositive Power Not applicable -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 46,985 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.34% -------------------------------------------------------------------------------- 12. Type of Reporting Person* PN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 5 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak IX Affiliates Fund, Limited Partnership 06-1556229 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by 20,863 Shares of Common Stock Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power Not applicable ---------------------------------------------- (7) Sole Dispositive Power 20,863 Shares of Common Stock ---------------------------------------------- (8) Shared Dispositive Power Not applicable -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 20,863 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.15% -------------------------------------------------------------------------------- 12. Type of Reporting Person* PN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 6 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak IX Affiliates, LLC 06-1556233 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 67,848 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 67,848 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 67,848 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.49% -------------------------------------------------------------------------------- 12. Type of Reporting Person* OO-LLC -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 7 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Oak Management Corporation 06-0990851 -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization Delaware -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* CO -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 8 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Bandel L. Carano -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization United States -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* IN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 9 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Gerald R. Gallagher -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization United States -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* IN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 10 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Edward F. Glassmeyer -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization United States -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* IN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 11 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Fredric W. Harman -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization United States -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* IN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 12 of 21 pages -------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (entities only) Ann H. Lamont -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group* (a) /_/ (b) /X/ -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization United States -------------------------------------------------------------------------------- Number of Shares (5) Sole Voting Power Beneficially Owned by Not applicable Each Reporting Person ---------------------------------------------- With: (6) Shared Voting Power 2,025,355 Shares of Common Stock ---------------------------------------------- (7) Sole Dispositive Power Not applicable ---------------------------------------------- (8) Shared Dispositive Power 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,025,355 Shares of Common Stock -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares* /_/ -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 14.71% -------------------------------------------------------------------------------- 12. Type of Reporting Person* IN -------------------------------------------------------------------------------- SEE INSTRUCTIONS BEFORE FILLING OUT! Cusip No. 19239V104 13G Page 13 of 21 pages Schedule 13G Amendment No. __* Common Stock Par Value $0.001 CUSIP No. 19239V104 ITEM 1(a) NAME OF ISSUER: Cogent Communications Group, Inc. ITEM 1(b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 1015 31st Street N.W. Washington, DC 20007 ITEM 2(a) NAME OF PERSON FILING: Oak Investment Partners IX, Limited Partnership Oak Associates IX, LLC Oak IX Affiliates Fund - A, Limited Partnership Oak IX Affiliates Fund, Limited Partnership Oak IX Affiliates, LLC Oak Management Corporation Bandel L. Carano Gerald R. Gallagher Edward F. Glassmeyer Fredric W. Harman Ann H. Lamont ITEM 2(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: c/o Oak Management Corporation One Gorham Island Westport, Connecticut 06880 ITEM 2(c) CITIZENSHIP: Please refer to Item 4 on each cover sheet for each filing person. ITEM 2(d) TITLE OF CLASS OF SECURITIES: Common stock, par value $0.001 per share ITEM 2(e) CUSIP NUMBER: 19239V104 ITEM 3 Not applicable ITEM 4 OWNERSHIP. The approximate percentages of shares of common stock reported as beneficially owned by the Reporting Persons is based upon 3,601,470 shares of common stock outstanding as of February 15, 2002, as reported by the Issuer to the Reporting Persons, plus 2,600,000 shares of common stock issuable upon conversion of the Issuer's issued and outstanding Series A preferred stock (the "Series A Preferred"), 19,809,783 shares of common stock issuable upon conversion of the Issuer's issued and outstanding Series B preferred stock (the "Series B Preferred"), and 4,977,340 shares of common stock issuable upon conversion of the Issuer's issued and outstanding Series C preferred Cusip No. 19239V104 13G Page 14 of 21 pages stock (the "Series C Preferred"), all as reported by the Issuer to the Reporting Persons. For all computations with respect to this Schedule 13G, the percentage beneficially owned by each reporting person was calculated on a fully diluted, as converted basis of all of the Issuer's issued and outstanding Series A Preferred, Series B Preferred and Series C Preferred, including shares held by third parties. Amounts shown as beneficially owned by each of Oak Investment Partners IX, Limited Partnership ("Oak Investment X") and Oak Associates IX, LLC, Oak Management, Bandel L. Carano, Edward F. Glassmeyer, Gerald R. Gallagher, Fredric W. Harman, and Ann H. Lamont include the (i) 483,250 shares of common stock into which the shares of Series A Preferred held by Oak Investment IX may be converted, (ii) 548,032 shares of common stock into which the shares of Series B Preferred held by Oak Investment IX may be converted, and (iii) 926,225 shares of common stock into which the shares of Series C Preferred held by Oak Investment IX may be converted. Amounts shown as beneficially owned by each of Oak IX Affiliates Fund-A, Limited Partnership ("Oak Affiliates-A IX"), Oak IX Affiliates, LLC, Oak Management, Bandel L. Carano, Edward F. Glassmeyer, Gerald R. Gallagher, Fredric W. Harman, and Ann H. Lamont include the (i) 11,599 shares of common stock into which the shares of Series A Preferred held by Oak Affiliates-A IX may be converted, (ii) 13,154 shares of common stock into which the shares of Series B Preferred held by Oak Affiliates-A IX may be converted, and (iii) 22,232 shares of common stock into which the shares of Series C Preferred held by Oak Affiliates-A IX may be converted. Amounts shown as beneficially owned by each of Oak IX Affiliates Fund, Limited Partnership ("Oak Affiliates IX"), Oak IX Affiliates, LLC, Oak Management, Bandel L. Carano, Edward F. Glassmeyer, Gerald R. Gallagher, Fredric W. Harman, and Ann H. Lamont include the (i) 5,150 shares of common stock into which the shares of Series A Preferred held by Oak Affiliates IX may be converted, (ii) 5,841 shares of common stock into which the shares of Series B Preferred held by Oak Affiliates IX may be converted, and (iii) 9,872 shares of common stock into which the shares of Series C Preferred held by Oak Affiliates IX may be converted. Please see Items 5, 6, 7, 8, 9 and 11 for each cover sheet for each filing entity. ITEM 5 OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: [ ] ITEM 6 OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not applicable ITEM 7 IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. Not applicable ITEM 8 IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. Not applicable Cusip No. 19239V104 13G Page 15 of 21 pages ITEM 9 NOTICE OF DISSOLUTION OF GROUP. Not applicable ITEM 10 CERTIFICATIONS. Not applicable Cusip No. 19239V104 13G Page 16 of 21 pages 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. Signature: Dated: February 15, 2002 Entities: Oak Investment Partners IX, Limited Partnership Oak Associates IX, LLC Oak IX Affiliates Fund - A, Limited Partnership Oak IX Affiliates Fund, Limited Partnership Oak IX Affiliates, LLC Oak Management Corporation By: /s/ Edward F. Glassmeyer ------------------------------------- Edward F. Glassmeyer, as General Partner or Managing Member or as Attorney-in-fact for the above-listed entities Individuals: Bandel L. Carano Gerald R. Gallagher Edward F. Glassmeyer Fredric W. Harman Ann H. Lamont By: /s/ Edward F. Glassmeyer ------------------------------------- Edward F. Glassmeyer, Individually and as Attorney-in-fact for the above-listed individuals Cusip No. 19239V104 13G Page 17 of 21 pages INDEX TO EXHIBITS ----------------- Page ---- EXHIBIT A Agreement of Reporting Persons 18 EXHIBIT B Power of Attorney 19