144 0001775672 XXXXXXXX LIVE 0001158324 COGENT COMMUNICATIONS HOLDINGS, INC. 000-51829 2450 N STREET, NW WASHINGTON DC 20037 2022954200 Chang John B. Officer Common Citi Global Markets, Inc.

388 Greenwich Street New York NY 10013

1000 74000.00 48623846 12/21/2023 NASDAQ Common 12/31/2022 Stock Grant Issuer N 1000 12/31/2022 Cash N John Chang

2450 N. Street, NW Washington DC 20037

Common 12/11/2023 3000 207000.00 John Chang

2450 N. Street, NW Washington DC 20037

common 12/14/2023 500 36000.00 12/21/2023 03/04/2022 /s/ John Chang