WASHINGTON, D.C. July 20, 2017 – Cogent Communications Holdings, Inc. (NASDAQ: CCOI) will host a conference call with financial analysts at 8:30 a.m. (ET) on August 3, 2017 to discuss Cogent’s operating results for the second quarter of 2017. Cogent will issue a press release announcing the operating results at 7:00 a.m. (ET) on August 3, 2017.

To participate, investors and other interested parties may access the earnings call as follows:

Dial-in Numbers: 1-800-668-4132 for U.S. callers or 1-224-357-2196 for international callers

Internet: An audio webcast is accessible under "Events" in the "News" section of Cogent's website at www.cogentco.com/events and will remain available through November 1, 2017.

Telephone Replay: Thursday, August 3, 2017 at 11:30 a.m. (ET) and continuing through 11:30 a.m. (ET) on Thursday, August 10, 2017.
To listen to the replay, please dial 1-404-537-3406, Access code 53186644

About Cogent Communications

Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, consistently ranked as one of the top five Internet backbone networks in the world. Cogent specializes in providing businesses with high speed Internet access, Ethernet transport and colocation services. Cogent's facilities-based, all-optical IP network provides services in 190 markets globally.

Since its inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in the world. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent also offers superior customer support by virtue of its end-to-end control of service delivery and network monitoring.

Cogent Communications is headquartered at 2450 N Street, NW, Washington, D.C. 20037. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser..

# # #

Information in this release may involve expectations, beliefs, plans, intentions or strategies regarding the future. These forward-looking statements involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to Cogent Communications Holdings, Inc. as of the date of the release, and we assume no obligation to update any such forward-looking statement. The statements in this release are not guarantees of future performance and actual results could differ materially from our current expectations. Numerous factors could cause or contribute to such differences. Some of the factors and risks associated with our business are discussed in Cogent's registration statements filed with the Securities and Exchange Commission and in its other reports filed from time to time with the SEC.

###