| 2026-05-26 | 8-K | 10.1 | Purchase and Sale Agreement, dated May 22, 2026. |
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| 2026-05-04 | 8-K | 10.2 | Restricted Stock Agreement, dated as of May 4, 2026, between the Company and David Schaeffer (filed herewith). |
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| 2026-02-20 | 10-K | 10.17 | Mark Harris Service Agreement with Cogent Communications UK Ltd. dated September 2, 2025 (filed herewith). |
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| 2026-01-07 | 8-K | 10.3 | Form of Restricted Stock Award between the Company and Vice Presidents with retention vesting provisions through January 1, 2029 (filed herewith). |
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| 2026-01-07 | 8-K | 10.2 | Form of Restricted Stock Awards between the Company and David Schaeffer (filed herewith). |
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| 2026-01-07 | 8-K | 10.1 | Amendment No. 11 to Employment Agreement of David Schaeffer, dated December 31, 2025 (filed herewith). |
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| 2025-03-12 | 8-K | 10.3 | Second Amendment to Lease Agreement, dated March 11, 2025, between Sodium LLC and Cogent Communications, LLC (filed herewith). |
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| 2025-01-15 | 8-K | 10.2 | Form of Restricted Stock Award between the Company and David Schaeffer. |
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| 2025-01-15 | 8-K | 10.1 | Amendment No. 10 to Employment Agreement of David Schaeffer, dated January 14, 2025. |
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| 2024-02-29 | 10-K | 10.23 | Form of Restricted Stock Award between the Company and the Vice President named executive officers (Retention) (filed herewith). |
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| 2024-01-05 | 8-K | 10.2 | Form of Restricted Stock Award between the Company and David Schaeffer. |
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| 2024-01-05 | 8-K | 10.1 | Amendment No. 9 to Employment Agreement of David Schaeffer, dated January 3, 2024. |
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| 2023-08-09 | 10-Q | 10.6 | First Amendment to Lease Agreement, dated February 20, 2023, between Germanium LLC and Cogent Communications, Inc., for early access to technical space at 196 Van Buren Street, Herndon, VA. (filed herewith) |
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| 2023-07-27 | 8-K | 10.1 | Second Amendment to Lease Agreement, dated July 25, 2023, between Germanium LLC and Cogent Communications, Inc., for technical space at 196 Van Buren Street, Herndon, VA. |
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| 2023-05-04 | 8-K | 10.1 | Restricted Stock Award, dated as of May 3, 2023, between the Company and Greg W. O’Connor (filed herewith). |
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| 2023-05-01 | 8-K | 10.3 | Customer Subscriber Agreement, dated as of May 1, 2023, by and between Cogent Infrastructure, Inc. and T-Mobile USA, Inc.*† |
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| 2023-05-01 | 8-K | 10.2 | IP Transit Agreement, dated as of May 1, 2023, by and between Cogent Communications, Inc. and T-Mobile USA, Inc. † |
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| 2023-05-01 | 8-K | 10.1 | Transition Services Agreement, dated as of May 1, 2023, by and between Cogent Infrastructure, Inc. and Sprint LLC.*† |
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| 2023-02-24 | 10-K | 10.27 | Henry Kilmer Severance Agreement with Cogent Communications, Inc., dated March 13, 2012 (filed herewith). |
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| 2023-01-11 | 8-K | 10.2 | Lease Agreement (network operations), dated January 6, 2023, between Germanium LLC and Cogent Communications, Inc. for technical space at 196 Van Buren Street, Herndon, VA. |
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| 2023-01-11 | 8-K | 10.1 | Lease Agreement (office space), dated January 6, 2023, between Thorium LLC and Cogent Communications, Inc. for offices at 198 Van Buren Street, Herndon, VA. |
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| 2023-01-06 | 8-K | 10.1 | Restricted Stock Award, dated as of January 3, 2023, between the Company and David Schaeffer (filed herewith) |
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| 2022-09-07 | 8-K | 10.1 | Guaranty, dated as of September 6, 2022, by and between Cogent Communications Holdings, Inc. and Sprint LLC. |
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| 2022-05-05 | 8-K | 10.1 | Restricted Stock Award, dated as of May 4, 2022, between the Company and Thaddeus G. Weed (filed herewith). |
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| 2022-05-05 | 10-Q | 10.1 | Dark Fiber IRU Agreement, dated April 14, 2000, between WilTel Communications, Inc. and Cogent Communications, Inc., as amended June 27, 2000, December 11, 2000, January 26, 2001, and February 21, 2001, filed as Exhibit 10.1 hereto and incorporated herein by reference.* |
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| 2022-02-25 | 10-K | 10.27 | Raymond B. “Brad” Kummer Severance Agreement with Cogent Communications, Inc., dated September 25, 2003 (filed herewith). |
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| 2022-02-25 | 10-K | 10.26 | John Chang Severance Agreement with Cogent Communications, Inc., dated December 18, 2012 (filed herewith). |
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| 2022-01-05 | 8-K | 10.1 | Restricted Stock Award, dated as of January 3, 2022, between the Company and David Schaeffer (filed herewith). |
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| 2021-02-26 | 8-K | 10.1 | Restricted Stock Award, dated as of February 24, 2021, between the Company and David Schaeffer (filed herewith). |
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| 2020-05-11 | 8-K | 10.3 | Severance Agreement, dated May 11, 2020, between the Company and Sean Wallace (filed herewith). |
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| 2020-05-11 | 8-K | 10.2 | Restricted Stock Award, dated May 11, 2020, between the Company and Sean Wallace (filed herewith). |
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| 2020-05-11 | 8-K | 10.1 | Employment Letter between the Company and Sean Wallace, effective April 22, 2020 (filed herewith). |
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| 2020-03-02 | 8-K | 10.2 | First Amendment to Lease Agreement, dated February 28, 2020, between Sodium LLC and Cogent Communications, Inc. (filed herewith). |
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| 2020-02-19 | 8-K | 10.2 | Restricted Stock Award, dated as of February 14, 2020, between the Company and David Schaeffer (filed herewith). |
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| 2020-02-19 | 8-K | 10.1 | Amendment No. 8 to Employment Agreement of David Schaeffer, dated February 14, 2020 (filed herewith). |
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| 2017-11-20 | 8-K | 10.1 | Amendment No. 7 to Employment Agreement of David Schaeffer, dated November 17, 2017 (filed herewith). |
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| 2017-08-03 | 10-Q | 10.1 | Restricted Stock Award, dated as of May 3, 2017, between the Company and David Schaeffer (filed herewith). |
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| 2017-05-03 | 8-K | 10.2 | Form of Restricted Stock Award, dated as of May 3, 2017, between the Company and the Vice President named executive officers (filed herewith). |
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| 2017-05-03 | 8-K | 10.1 | Restricted Stock Award, dated as of May 3, 2017, between the Company and David Schaeffer (filed herewith). |
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| 2016-05-05 | 8-K | 10.2 | Form of Restricted Stock Award, dated as of May 4, 2016, between the Company and the Vice President named executive officers (filed herewith). |
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| 2016-05-05 | 8-K | 10.1 | Restricted Stock Award, dated as of May 4, 2016, between the Company and David Schaeffer (filed herewith). |
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| 2015-10-01 | 8-K | 10.2 | Restricted Stock Award to James Bubeck dated December 1, 2014. |
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| 2015-10-01 | 8-K | 10.1 | Restricted Stock Award to James Bubeck dated September 28, 2015. |
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| 2015-04-17 | 8-K | 10.2 | Termination Agreement of the Lease Agreement, dated April 16, 2015, between Niobium LLC and Cogent Communications, Inc. |
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| 2015-04-17 | 8-K | 10.1 | Lease Agreement, dated April 16, 2015, between Sodium LLC and Cogent Communications, Inc. |
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| 2014-11-05 | 8-K | 10.4 | Restricted Stock Award, dated as of November 3, 2014, between the Company and Timothy O’Neill (filed herewith). |
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| 2014-11-05 | 8-K | 10.3 | Restricted Stock Award, dated as of November 3, 2014, between the Company and Robert Beury (filed herewith). |
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| 2014-11-05 | 8-K | 10.2 | Restricted Stock Award, dated as of November 3, 2014, between the Company and Ernest Ortega (filed herewith). |
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| 2014-11-05 | 8-K | 10.1 | Restricted Stock Award, dated as of November 3, 2014, between the Company and Thaddeus (“Tad”) Weed (filed herewith). |
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| 2014-08-07 | 10-Q | 10.6 | Restricted Stock Award to Mr. Schaeffer dated August 6, 2014 — cliff vest (filed herewith). |
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| 2014-08-07 | 10-Q | 10.5 | Restricted Stock Award to Mr. Schaeffer dated August 6, 2014 — monthly vest (filed herewith). |
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| 2014-08-07 | 10-Q | 10.4 | Amendment No. 6 to Employment Agreement of David Schaeffer, dated August 6, 2014 (filed herewith). |
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| 2014-08-07 | 10-Q | 10.3 | Extension of Lease for headquarters space to August 31, 2016 by and between Cogent Communications Inc. and Niobium LLC dated as of August 6, 2014 (filed herewith). Niobium LLC is owned by the Company’s CEO, David Schaeffer, and his wife. |
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| 2014-05-15 | 8-K | 10.1 | Assignment and Assumption Agreement, dated as of May 15, 2014, by and between Cogent Communications Group, Inc. and Cogent Communications Holdings, Inc. |
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| 2014-04-18 | 8-K | 10.1 | 2004 Incentive Award Plan of Cogent Communications Group, Inc., as amended and restated through April 17, 2014 (filed herewith). |
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| 2013-08-01 | 8-K | 10.2 | Restricted Stock Award to Ernest Ortega, filed herewith. |
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| 2013-08-01 | 8-K | 10.1 | Ernest Ortega Severance Agreement with Cogent Communications Group, Inc., filed herewith. |
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| 2013-02-27 | 10-K | 10.31 | 2004 Incentive Award Plan of Cogent Communications Group, Inc., as amended and restated through February 20, 2013 (subject to ratification by stockholders at the annual meeting to be held on April 18, 2013) (filed herewith). |
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| 2012-11-07 | 10-Q | 10.1 | Extension of lease for headquarters space to August 31, 2015, by and between Niobium LLC (successor to 6715 Kenilworth Avenue Partnership) and Cogent Communications, Inc. dated as of November 7, 2012 |
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| 2012-04-23 | 8-K | 10.2 | Form of Restricted Stock Award dated April 19, 2012 - cliff vest (filed herewith). |
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| 2012-04-23 | 8-K | 10.1 | Form of Restricted Stock Award dated April 19, 2012 - monthly vest (filed herewith). |
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| 2012-02-27 | 10-K | 10.30 | Amendment to Lease Agreement for headquarters space reducing leased square footage of office space, by and between 6715 Kenilworth Avenue Partnership and Cogent Communications, Inc., dated as of February 22, 2012 (filed herewith). 6715 Kenilworth Avenue Partnership is owned by the Company's CEO, David Schaeffer, and his wife. |
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| 2012-02-27 | 10-K | 10.29 | Timothy G. O'Neill Employment Agreement with Cogent Communications Group, Inc., dated as of September 25, 2003 (filed herewith) |
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| 2012-02-27 | 10-K | 10.7 | 2004 Incentive Award Plan of Cogent Communications Group, Inc., as amended and restated through February 21, 2012 (filed herewith). |
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| 2011-08-08 | 10-Q | 10.1 | Extension of Lease for headquarters space to August 31, 2013 and addition of 1st floor office space, by and between 6715 Kenilworth Avenue Partnership and Cogent Communications Group, Inc., dated as of August 5, 2011 (filed herewith). 6715 Kenilworth Avenue Partnership is owned by the Company’s CEO, Dave Schaeffer, and his wife. |
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| 2010-04-20 | 8-K | 10.3 | Form of Restricted Stock Award dated April 15, 2010 (filed herewith). |
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| 2010-04-20 | 8-K | 10.2 | Form of Restricted Stock Award dated April 15, 2010 (filed herewith). |
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| 2010-04-20 | 8-K | 10.1 | 2004 Incentive Award Plan of Cogent Communications Group, Inc. (as amended and restated through April 15, 2010) (filed herewith). |
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| 2010-04-07 | 8-K | 10.1 | Amendment No. 5 to Employment Agreement of Dave Schaeffer, dated April 7, 2010 (filed herewith). |
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| 2010-03-01 | 10-K | 10.25 | Amendment No. 4 to Employment Agreement of Dave Schaeffer, dated as of February 26, 2010 (filed herewith) |
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| 2009-11-09 | 10-Q | 10.1 | Commercial Note and Agreement to Commercial Note and related Security Agreement, dated October 15, 2009, between Cogent Communications Group, Inc. and SunTrust Bank (filed herewith) |
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