WASHINGTON, D.C. July 18, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI) will host a conference call with financial analysts at 8:30 a.m. (ET) on August 8, 2008 to discuss Cogent’s operating results for the second quarter of 2008. Cogent will issue a press release announcing the operating results at 7 a.m. (ET) on August 8, 2008.

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

Dial-in Numbers: 1-877-545-1488 for U.S. callers
1-719-325-4895 for international callers

Internet: An audio webcast is accessible under “Events” at the “Investor Relations” section of Cogent’s website at www.cogentco.com and will remain available through October 31, 2008.

Telephone Replay: Friday, August 8, 2008 at 11:30 a.m. ET and continuing through 11:59 p.m. ET on Friday, August 15.
To listen to the replay, please dial 1-719-457-0820, Access code 4263817

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in existence with lit capacities ranging from 80 to 200 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 110 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. 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 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

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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 Group, 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.

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WASHINGTON, D.C. June 11, 2008
Cogent Communications Group, Inc. (Nasdaq: CCOI) today announced that its board of directors has authorized the Company to repurchase up to an additional $50 million of its shares of common stock in open market and negotiated purchases through December 31, 2009. This is in addition to the $50 million authorized by the board in August 2007. Cogent stated that it implemented the program due to its faith in its growth opportunities and that it believed the program would benefit its stockholders. Cogent currently has approximately 46.2 million common shares outstanding. Cogent has repurchased approximately 2.8 million shares for approximately $50 million since August 2007, and it had previously repurchased 1.8 million shares of its common stock for $50 million on June 6, 2007 in conjunction with its issuance of $200 million of convertible notes.

These repurchases, if and when made, will be made subject to market conditions, applicable legal requirements (including SEC rules) and other factors. This plan does not obligate Cogent to acquire any particular amount of common stock and the plan may be suspended at any time at Cogent’s discretion.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in the world with lit capacities ranging from 80 to 200 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s 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 Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

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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 Group, 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.

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WASHINGTON, D.C. June 2, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI), one of the largest Ethernet Internet service providers in the world, today announced that Dave Schaeffer, chief executive officer, will present at the following investor-relations conferences:

Deutsche Bank’s 2008 Media & Telecommunications Conference is being held in at the New York Palace Hotel. Dave Schaeffer will be presenting on Monday, June 9th at 9:50 AM ET.

18th Annual Wachovia Nantucket Equity Conference is being held at the White Elephant on Nantucket Island, MA. Dave Schaeffer will be presenting on Tuesday, June 24th at 10:45 AM ET.

Investors and other interested parties may access live audio webcasts of these presentations by going to the Investor Relations section of Cogent’s website (http://www.cogentco.com/us/ir_events.php) to access the links to the live audio webcasts. A replay of each webcast will be available on Cogent’s IR website for 30 days following the presentation.

About Cogent Communications

Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in the world with lit capacities ranging from 80 to 200 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

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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 Group, 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.

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WASHINGTON, D.C. May 13, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI), one of the largest Ethernet Internet service providers in the world, today announced that Dave Schaeffer, chief executive officer, will present at the following investor-relations conferences:

JPMorgan Technology Conference is being held in at the Westin Boston Waterfront. Dave Schaeffer will be presenting on Wednesday, May 21 at 2:20PM ET.

2008 Friedman, Billings, Ramsey & Co., Inc. Capital Markets Growth Conference is being held at the Grand Hyatt New York. Dave Schaeffer will present at 3:05 PM ET on Wednesday, May 28th.

Lehman Brothers Worldwide Wireless and Wireline Conference is being held at The Hilton Hotel, New York City. Dave Schaeffer will present at 2:30 pm on Thursday, May 29th.

Cowen 20/20 TMT Conference is being held at The New York Palace Hotel, New York City. Dave Schaeffer will present at 10:15 AM ET on May 30th.

Oppenheimer’s Annual Communications & Technology Conference is being held at the Four Seasons Hotel in Boston. Dave Schaeffer will present at 10:30 AM on June 3rd.

Investors and other interested parties may access live audio webcasts of all of these presentations by going to the Investor Relations section of Cogent’s website (http://www.cogentco.com/us/ir_events.php) to access the links to the live audio webcasts. A replay of each webcast will be available on Cogent’s IR website for 30 days following the presentation.

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in existence with lit capacities ranging from 80 to 200 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

# # #

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 Group, 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.

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WASHINGTON, D.C. April 9, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI) will host a conference call with financial analysts at 8:30 a.m. (ET) on May 9, 2008 to discuss Cogent’s operating results for the first quarter of 2008. Cogent will issue a press release announcing the operating results at 7 a.m. (ET) on May 9, 2008.

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

Dial-in Numbers: 1-877-548-7912 for U.S. callers
1-719-325-4901 for international callers

Internet: An audio webcast is accessible under “Events” at the “Investor Relations” section of Cogent’s website at www.cogentco.com and will remain available through July 31, 2008.

Telephone Replay: Friday, May 9, 2008 at 11:30 a.m. ET and continuing through 11:59 p.m. ET on Friday, May 16.
To listen to the replay, please dial 1-719-457-0820, Access code 9861134

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in existence with lit capacities ranging from 80 to 180 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. 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 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

# # #

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 Group, 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.

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WASHINGTON, D.C. March 10, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI), one of the largest Ethernet Internet service providers in the world, today announced that Dave Schaeffer, chief executive officer, will present at Citi's 5th Annual Small & Mid Cap Conference at 2:25 pm PT, March 17th. The conference is being held at the Four Seasons in Las Vegas.

Investors and other interested parties may access a live audio webcast of the presentation by going to the Investor Relations section of Cogent’s website (http://www.cogentco.com/us/ir_events.php) to access the link to the live audio webcast. A replay of the webcast will be available on Cogent’s IR website for 30 days following the presentation.

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in existence with lit capacities ranging from 80 to 180 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

# # #

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 Group, 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.

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WASHINGTON, D.C. February 1, 2008
Cogent Communications Group, Inc. (NASDAQ: CCOI) will host a conference call with financial analysts at 8:30 a.m. (ET) on February 27, 2008 to discuss Cogent’s operating results for the fourth quarter and full year for 2007. Cogent will issue a press release announcing the operating results at 7 a.m. (ET) on February 27, 2008.

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

Dial-in Numbers: 1-877-397-0300 for U.S. callers
1-719-325-4905 for international callers

Internet: An audio webcast is accessible under “Events” at the “Investor Relations” section of Cogent’s website at www.cogentco.com and will remain available through April 30, 2008.

Telephone Replay: Wednesday, February 27, 2008 at 11:30 a.m. ET and continuing through 11:59 p.m. ET on Friday, February 29.
To listen to the replay, please dial 1-719-457-0820, Access code 2432032

About Cogent Communications
Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, operating one of the largest capacity IP networks in existence with lit capacities ranging from 80 to 180 Gigabits per second. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent’s facilities-based, all-optical IP network backbone provides IP services in over 100 markets located in North America and Europe.

Since Cogent’s inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. 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 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at info@cogentco.com.

# # #

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 Group, 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.

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