CCOI

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Mr. Brooks, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Mr. Ferguson, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Mr. Montagner, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Ms. Howell, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Ms. Howard, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Mr. De Sa, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q2 2026 service. All shares are owned directly by Ms. Kennedy, a director of Cogent Communications Holdings, Inc.

These shares were transferred to a family trust for no consideration.

This award of restricted stock will vest in three tranches, with each tranche vesting on the last day of any consecutive sixty-calendar-day period during the period from February 28, 2026, through February 28, 2031, if the volume weighted average price of the Company's Common Stock equals or exceeds: $70.00, in which case 200,000 shares will vest; $85.00, in which a case 300,000 will vest; and $100, in which case 500,000 shares will vest. Vesting is subject to the reporting person's continuous service with the company as chief executive officer for the period from February 28, 2026, to December 31, 2028, and either as CEO or in such other capacity approved by the Board for the period from January 1, 2029, to February 28, 2031.

3. These shares were transferred to a family trust for no consideration.

1. On January 3, 2022, the reporting person was granted an award of up to 88,000 performance shares. Tranche 1 of the award consisted of 29,333 shares based on the Company's organic growth rate in revenue as compared to 1.5 times the organic growth rate of the NASDAQ Telecommunications Index ("NTI") between January 1, 2022, and December 31, 2025. Tranche 2 of the award consisted of 29,333 shares based on the Company's organic growth rate in cash flows from operating activities as compared to 2.0 times the organic growth rate of the NTI between January 1, 2022, and December 31, 2025. Tranche 3 of the award consisted of 29,334 shares based on the Company's total shareholder return as compared to the total shareholder return of the NTI between January 1, 2022, and December 31, 2025.

2. On April 1, 2026, the Company determined that the performance criteria for the Tranche 1 had been achieved and 29,333 shares of common stock were earned and vested. The Company also determined that the performance criteria for Tranches 2 and 3 had not been achieved and that 58,667 shares were therefore forfeited.

3. These shares were transferred to a family trust for no consideration.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Mr. Brooks, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Ms. Kennedy, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Ms. Howard, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Ms. Howell, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Mr. De Sa, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Mr. Ferguson, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q1 2026 service. All shares are owned directly by Mr. Montagner, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Ms. Howell, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Mr. Brooks, a director of Cogent Communications Holdings, Inc.

The award of restricted stock shall vest in one third of the grant on January 1 of each of 2027, 2028 and 2029.

This award of restricted stock shall vest in one third of the grant on January 1 of each of 2027, 2028 and 2029.

The award shall vest effective January 1, 2029, based on Mr. Weed's continued employment to that date

These shares were transferred to a family trust for no consideration.

The award of restricted stock shall vest in one third of the grant on January 1 of each of 2027, 2028 and 2029.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Mr. Montagner, a director of Cogent Communications Holdings, Inc.

The award shall vest effective January 1, 2029, based on Mr. Chang's continued employment to that date.

The award shall vest effective January 1, 2029, based on Mr. Harris' continued employment to that date.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Ms. Howard, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Mr. Ferguson, a director of Cogent Communications Holdings, Inc.

The award of restricted stock shall vest effective January 1, 2029, based on Mr. Schaeffer's continued employment as Chief Executive Officer of the Company through December 31, 2028.

These shares were transferred to a family trust for no consideration.

The award of restricted stock shall vest in one third of the grant on January 1 of each of 2027, 2028 and 2029.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Ms. Kennedy, a director of Cogent Communications Holdings, Inc.

The shares of common stock reported reflects a quarterly payment to directors for Q4 2025 service. All shares are owned directly by Mr. De Sa, a director of Cogent Communications Holdings, Inc.

On January 3, 2022, the reporting person was granted an award of restricted stock units, which vest in the form of common stock based upon the Issuer's achievement of certain performance goals. The Issuer's Board of Directors, and its Compensation Committee, determined that the performance goals had been met, resulting in the vesting of these shares on December 1, 2025 under the terms of the grant.

On January 3, 2022, the reporting person was granted an award of restricted stock units, which vest in the form of common stock based upon the Issuer's achievement of certain performance goals. The Issuer's Board of Directors, and its Compensation Committee, determined that the performance goals had been met, resulting in the vesting of these shares on December 1, 2025 under the terms of the grant.