X0306 4 2020-05-11 0 0001158324 COGENT COMMUNICATIONS HOLDINGS, INC. CCOI 0001811050 Wallace Sean Robert 2450 N ST NW 4TH FLOOR WASHINGTON DC 20037 0 1 0 0 VP, CFO & Treasurer common stock 2020-05-11 4 A 0 12000 0 A 12000 D Subject to continued employment, the grant of restricted common stock for 12,000 shares will vest 25% on June 1, 2021, and the remainder will vest quarterly in increments of 750 shares over the next three years so that the grant is fully vested after four years of employment. /s/ Sean Robert Wallace 2020-05-11