Form 4 Filing by Henry W. Kilmer

Henry W. Kilmer, VP of Network Strategy at Cogent Communications Holdings, Inc. (CCOI), reported a disposition of 2,400 shares of common stock on June 15, 2026. The transaction was executed at a price of $17.01 per share. Following this transaction, Mr. Kilmer directly owns 38,600 shares of common stock. The filing was made on Form 4 and signed by Mr. Kilmer on the same day.