WASHINGTON, D.C. August 14, 2018 — Cogent Communications Holdings, Inc. (NASDAQ: CCOI) ("Cogent Communications") today announced that Cogent Communications Group, Inc. ("Cogent"), a wholly owned subsidiary of Cogent Communications, intends to commence a tack-on offering of an additional $70 million aggregate principal amount of its 5.375% Senior Secured Notes due 2022 (the "Notes") to be offered and sold only to persons reasonably believed to be qualified institutional buyers in an unregistered offering pursuant to Rule 144A under the Securities Act of 1933, as amended (the "Act"). The Notes will be guaranteed by Cogent's domestic subsidiaries, subject to certain exceptions, and by Cogent Communications. Cogent Communications' guarantee will be unsecured and Cogent Communications will not be subject to the covenants under the indenture governing the Notes.