Cogent Communications Holdings, Inc. Human Resources Contracts & Agreements

Transition Services Agreement, dated as of May 1, 2023, by and between Cogent Infrastructure, Inc. and Sprint LLC (Filed With SEC on May 1, 2023)

Henry Kilmer Severance Agreement with Cogent Communications, Inc., dated March 13, 2012 (Filed With SEC on February 24, 2023)

John Chang Severance Agreement with Cogent Communications, Inc., dated December 18, 2012 (Filed With SEC on February 25, 2022)

Raymond B. Brad Kummer Severance Agreement with Cogent Communications, Inc., dated September 25, 2003 (Filed With SEC on February 25, 2022)

Employment Letter between the Company and Sean Wallace, effective April 22, 2020 (filed herewith) (Filed With SEC on May 11, 2020)

Severance Agreement, dated May 11, 2020, between the Company and Sean Wallace (filed herewith) (Filed With SEC on May 11, 2020)

Amendment No. 8 to Employment Agreement of David Schaeffer, dated February 14, 2020 (Filed With SEC on February 19, 2020)

Amendment No. 7 to Employment Agreement of David Schaeffer, dated November 17, 2017 (Filed With SEC on November 20, 2017)

RESTRICTED STOCK AWARD Name: Dave Schaeffer Cogent Communications Holdings, Inc. Grant Date: May 4, 2016 2004 Incentive Award Plan (the Plan) (Filed With SEC on May 5, 2016)

RESTRICTED STOCK AWARD Name: [Name of Vice President] Cogent Communications Holdings, Inc. Grant Date: May 4, 2016 2004 Incentive Award Plan (the Plan) (Filed With SEC on May 5, 2016)

RESTRICTED STOCK AWARD Name: James Bubeck Cogent Communications Holdings, Inc.Grant Date: September 28, 2015 2004 Incentive Award Plan (the Plan) (Filed With SEC on October 1, 2015)

RESTRICTED STOCK AWARD Name: James Bubeck Cogent Communications Holdings, Inc.Grant Date: December 1, 2014 2004 Incentive Award Plan (the Plan) (Filed With SEC on October 1, 2015)

Amendment No. 6 to Employment Agreement of David Schaeffer (Filed With SEC on August 7, 2014)

RESTRICTED STOCK AWARD Name: David Schaeffer Cogent Communications Holdings, Inc. Grant Date: August 6, 2014 2004 Incentive Award Plan (the Plan) (Filed With SEC on August 7, 2014)

COGENT COMMUNICATIONS GROUP, INC 2004 INCENTIVE AWARD PLAN (as amended by the Board of Directors through April 17, 2014) ARTICLE 1 PURPOSE (Filed With SEC on April 18, 2014)

Severance Agreement (Filed With SEC on August 1, 2013)

RESTRICTED STOCK AWARD Name: Ernie Ortega Cogent Communications Group, Inc.Grant Date: August 1, 2013 2004 Incentive Award Plan (the Plan) (Filed With SEC on August 1, 2013)

COGENT COMMUNICATIONS GROUP, INC 2004 INCENTIVE AWARD PLAN (as amended by the Board of Directors through February 20, 2013, subject to stockholder approval) ARTICLE 1 PURPOSE (Filed With SEC on February 27, 2013)

RESTRICTED STOCK AWARD Name: Cogent Communications Group, Inc. Grant Date: 2004 Incentive Award Plan (the Plan) (Filed With SEC on April 23, 2012)

COGENT COMMUNICATIONS GROUP, INC 2004 INCENTIVE AWARD PLAN (as amended through February 21, 2012) ARTICLE 1 PURPOSE (Filed With SEC on February 27, 2012)

Severance Agreement (Filed With SEC on February 27, 2012)

COGENT COMMUNICATIONS GROUP, INC 2004 INCENTIVE AWARD PLAN (as amended through April 15, 2010) ARTICLE 1 PURPOSE (Filed With SEC on April 20, 2010)

RESTRICTED STOCK AWARD Name: Cogent Communications Group, Inc.Grant Date: 2004 Incentive Award Plan (the Plan) (Filed With SEC on April 20, 2010)

Amendment No. 5 to Employment Agreement of Dave Schaeffer (Filed With SEC on April 7, 2010)

Amendment No. 4 to Employment Agreement ofDavid Schaeffer (Filed With SEC on March 1, 2010)

Severance Agreement (Filed With SEC on August 16, 2004)