Cogent Communications Group, Inc. (AMEX: COI), today announced that it has agreed to sell 10,000,000 shares of common stock at a public offering price of $6.00 per share in a previously announced underwritten public offering.

Lehman Brothers is acting as the sole book-running manager, Thomas Weisel Partners is acting as co-lead manager and CIBC World Markets and Friedman Billings Ramsey are acting as co-managers.

Copies of the prospectus related to this offering can be obtained from:
Lehman Brothers Inc.
c/o ADP Financial Services
Prospectus Fulfillment
1155 Long Island Avenue
Edgewood, NY 11717

Thomas Weisel Partners LLC
One Montgomery Tower
One Montgomery Street
San Francisco, CA 94104

CIBC World Markets
USE Prospectus
622 3rd Avenue, 9th Floor
New York, NY 10017
Fax: 212-667-6303
useprospectus@us.cibc.com

Friedman Billings Ramsey
1001 Nineteenth Street North
Arlington, VA 22209

About Cogent Communications Group, Inc.
Cogent Communications (AMEX: COI) is a multinational, Tier 1 facilities-based ISP that specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent's facilities-based, all-optical IP network backbone spans over 11 countries and provides IP services in markets located in North America and Europe.

Since Cogent's inception, Cogent has exploited the benefits that IP technology provides, building a network that enables Cogent to offer large, dedicated bandwidth connections at highly competitive prices. Network ownership also enables Cogent to offer superior customer support through the ability to control service delivery and network monitoring end-to-end.

Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007.