Cogent Communications Holdings Inc. Watch

Other Revised 12/09/24 Cogent Communications Holdings, Inc. Presents at UBS Global Media & Communications Conference, Dec-09-2024 02:15 PM 12/09/24 Other Revised 12/03/24 Cogent Communications Holdings, Inc. Presents at Bank of America Securities 2024 Leveraged Finance Conference, Dec-03-2024 03:30 PM 12/03/24 Earnings Revised 11/09/24 Cogent Communications Holdings, Inc., Q3 2024 Earnings Call, Nov 07, 2024 11/07/24 Other Revised 09/24/24 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 32nd Annual Leveraged Finance Conference, Sep-24-2024 03:55 PM 09/24/24 Other Revised 09/09/24 Cogent Communications Holdings, Inc. Presents at Goldman Sachs Communacopia + Technology Conference 2024, Sep-09-2024 10:10 AM 09/09/24 Other Revised 09/05/24 Cogent Communications Holdings, Inc. Presents at Bank of America’s 2024 Media, Communications and Entertainment Conference, Sep-05-2024 10:30 AM 09/05/24 Other Revised 09/25/24 Cogent Communications Holdings, Inc. Presents at Citi's 2024 Global TMT Conference, Sep-04-2024 01:20 PM 09/04/24 Other Revised 08/15/24 Cogent Communications Holdings, Inc. Presents at TD Cowen 10th Annual Communications Infrastructure Summit, Aug-13-2024 03:40 PM 08/13/24 Other Revised 08/15/24 Cogent Communications Holdings, Inc. Presents at Oppenheimer's 27th Annual Technology, Internet & Communications Conference, Aug-12-2024 10:45 AM 08/12/24 Earnings Revised 08/28/24 Cogent Communications Holdings, Inc., Q2 2024 Earnings Call, Aug 08, 2024 08/08/24 Other Revised 09/25/24 Cogent Communications Holdings, Inc. Presents at BofA SMID Cap Conference, Aug-06-2024 02:00 PM 08/06/24 Other Revised 05/30/24 Cogent Communications Holdings, Inc. Presents at TD Cowen’s 52nd Annual Technology, Media & Telecom Conference 2024, May-29-2024 01:50 PM 05/29/24 Other Revised 05/20/24 Cogent Communications Holdings, Inc. Presents at The 52nd J.P. Morgan Annual Global Technology, Media & Communications Conference, May-20-2024 08:00 AM 05/20/24 Earnings Revised 06/27/24 Cogent Communications Holdings, Inc., Q1 2024 Earnings Call, May 09, 2024 05/09/24 Other Revised 03/29/24 Cogent Communications Holdings, Inc. Presents at 45th Annual Raymond James Institutional Investors Conference 2024, Mar-04-2024 04:00 PM 03/04/24 Earnings Revised 03/06/24 Cogent Communications Holdings, Inc., Q4 2023 Earnings Call, Feb 29, 2024 02/29/24

Other Revised 02/16/24 Cogent Communications Holdings, Inc. Presents at 2023 Raymond James TMT and Consumer Conference, Dec-05-2023 08:35 AM 12/05/23 Other Revised 02/06/24 Cogent Communications Holdings, Inc. Presents at UBS Global Media and Communications Conference, Dec-04-2023 03:00 PM 12/04/23 Other Revised 01/23/24 Cogent Communications Holdings, Inc. Presents at Bank of America Securities 2023 Leveraged Finance Conference, Nov-29-2023 07:30 AM 11/29/23 Other Revised 11/28/23 Cogent Communications Holdings, Inc. Presents at 2023 UBS Global Technology Conference, Nov-28-2023 10:55 AM 11/28/23 Earnings Revised 11/11/23 Cogent Communications Holdings, Inc., Q3 2023 Earnings Call, Nov 09, 2023 11/09/23 Other Revised 10/03/23 Cogent Communications Holdings, Inc. Presents at 31st Annual Deutsche Bank Leveraged Finance Conference, Oct-03-2023 03:35 PM 10/03/23 Other Revised 02/07/24 Cogent Communications Holdings, Inc. Presents at Bank of America Securities Media, Communications and Entertainment Conference, Sep-13-2023 02:00 PM 09/13/23 Earnings Revised 10/30/23 Cogent Communications Holdings, Inc., Q2 2023 Earnings Call, Aug 10, 2023 08/10/23 Other Revised 06/08/23 Cogent Communications Holdings, Inc. Presents at TD Cowen 51st Annual Technology, Media & Telecom Conference, May-31-2023 03:45 PM 05/31/23 Other Revised 05/30/23 Cogent Communications Holdings, Inc. Presents at 51st Annual J.P. Morgan’s Global Technology, Media and Communications Conference 2023, May-23-2023 11:30 AM 05/23/23 Earnings Revised 05/29/23 Cogent Communications Holdings, Inc., Q1 2023 Earnings Call, May 04, 2023 05/04/23 Other Revised 02/27/23 Cogent Communications Holdings, Inc. Presents at 31st Annual Media, Internet & Telecom Conference, Feb-27-2023 01:50 PM 02/27/23 Earnings Revised 01/05/24 Cogent Communications Holdings, Inc., Q4 2022 Earnings Call, Feb 23, 2023 02/23/23 Other Revised 01/04/23 Cogent Communications Holdings, Inc. Presents at Citi’s 2023 Communications, Media & Entertainment Conference, Jan-04-2023 01:00 PM 01/04/23

Other Revised 12/05/22 Cogent Communications Holdings, Inc. Presents at UBS 50th Annual Global TMT Conference, Dec-05-2022 11:40 AM 12/05/22 Other Revised 11/30/22 Cogent Communications Holdings, Inc. Presents at Credit Suisse 26th Annual Technology Conference, Nov-30-2022 10:55 AM 11/30/22 Other Revised 11/29/22 Cogent Communications Holdings, Inc. Presents at Bank of America Securities Leveraged Finance/Credit Conference, Nov-29-2022 10:50 AM 11/29/22 Earnings Revised 11/03/22 Cogent Communications Holdings, Inc., Q3 2022 Earnings Call, Nov 03, 2022 11/03/22 Other Revised 09/20/22 Cogent Communications Holdings, Inc. Presents at Deutsche Bank's 30th Annual Leveraged Finance Conference, Sep-20-2022 02:15 PM 09/20/22 Other Revised 09/12/22 Cogent Communications Holdings, Inc. Presents at Goldman Sachs Communacopia + Technology Conference 2022, Sep-12-2022 10:45 AM 09/12/22 Other Revised 09/07/22 Cogent Communications Holdings, Inc. Presents at Bank of America Media, Communications & Entertainment Conference 2022, Sep-07-2022 05:50 PM 09/07/22 Other Revised 09/01/22 Cogent Communications Holdings, Inc. Presents at Deutsche Bank’s 2022 Technology Conference, Sep-01-2022 04:15 PM 09/01/22 Earnings Revised 08/04/22 Cogent Communications Holdings, Inc., Q2 2022 Earnings Call, Aug 04, 2022 08/04/22 Other Revised 06/14/22 Cogent Communications Holdings, Inc. Presents at Credit Suisse 24th Annual Communications Conference, Jun-14-2022 10:05 AM 06/14/22 Other Revised 06/02/22 Cogent Communications Holdings, Inc. Presents at Cowen 50th Annual Technology, Media, and Telecom Conference, Jun-02-2022 02:10 PM 06/02/22 Other Revised 05/23/22 Cogent Communications Holdings, Inc. Presents at J.P. Morgan’s 50th Annual Global Technology, Media and Communications Conference 2022, May-23-2022 03:10 PM 05/23/22 Other Revised 05/12/22 Cogent Communications Holdings, Inc. Presents at Goldman Sachs 7th Annual Leveraged Finance and Credit Conference, May-12-2022 02:20 PM 05/12/22 Earnings Revised 05/05/22 Cogent Communications Holdings, Inc., Q1 2022 Earnings Call, May 05, 2022 05/05/22 Other Revised 03/14/22 Cogent Communications Holdings, Inc. Presents at 30th Annual Deutsche Bank Media, Internet & Telecom Conference, Mar-14-2022 12:50 PM 03/14/22 Other Revised 03/08/22 Cogent Communications Holdings, Inc. Presents at Raymond James 43rd Annual Institutional Investors Conference, Mar-08-2022 08:05 AM 03/08/22 Earnings Revised 02/24/22 Cogent Communications Holdings, Inc., Q4 2021 Earnings Call, Feb 24, 2022 02/24/22 Other Revised 01/05/22 Cogent Communications Holdings, Inc. Presents at Citi’s AppsEconomy Virtual Conference, Jan-05-2022 05:00 PM 01/05/22

Other Revised 12/06/21 Cogent Communications Holdings, Inc. Presents at UBS Global TMT Virtual Conference, Dec-06-2021 03:00 PM 12/06/21 Other Revised 12/01/21 Cogent Communications Holdings, Inc. Presents at Credit Suisse 25th Annual Technology Conference, Dec-01-2021 08:45 AM 12/01/21 Other Revised 11/30/21 Cogent Communications Holdings, Inc. Presents at Bank of America 2021 Leveraged Finance Virtual Conference, Nov-30-2021 07:30 AM 11/30/21 Earnings Revised 11/04/21 Cogent Communications Holdings, Inc., Q3 2021 Earnings Call, Nov 04, 2021 11/04/21 Other Revised 10/05/21 Cogent Communications Holdings, Inc. Presents at Deutsche Bank's 29th Annual Leveraged Finance Conference, Oct-05-2021 01:15 PM 10/05/21 Other Revised 09/21/21 Cogent Communications Holdings, Inc. Presents at Goldman Sachs 30th Annual Communacopia Conference, Sep-21-2021 01:15 PM 09/21/21 Other Revised 09/09/21 Cogent Communications Holdings, Inc. Presents at Deutsche Bank Technology Conference 2021, Sep-09-2021 09:50 AM 09/09/21 Earnings Revised 08/05/21 Cogent Communications Holdings, Inc., Q2 2021 Earnings Call, Aug 05, 2021 08/05/21 Other Revised 06/14/21 Cogent Communications Holdings, Inc. Presents at Credit Suisse 23rd Annual Communications Conference, Jun-14-2021 11:55 AM 06/14/21 Other Revised 05/24/21 Cogent Communications Holdings, Inc. Presents at JPMorgan 49th Annual Global Technology, Media and Communications Conference, May-24-2021 02:00 PM 05/24/21 Earnings Revised 04/29/21 Cogent Communications Holdings, Inc., Q1 2021 Earnings Call, Apr 29, 2021 04/29/21 Other Revised 03/08/21 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 29th Annual Media, Internet & Telecom Conference, Mar-08-2021 11:00 AM 03/08/21 Earnings Revised 02/25/21 Cogent Communications Holdings, Inc., 2020 Earnings Call, Feb 25, 2021 02/25/21 Other Revised 01/05/21 Cogent Communications Holdings, Inc. Presents at Citi’s 2021 Global TMT West Virtual Conference, Jan-05-2021 03:00 PM 01/05/21

Other Revised 12/07/20 Cogent Communications Holdings, Inc. Presents at UBS Global TMT Virtual Conference, Dec-07-2020 02:50 PM 12/07/20 Other Revised 12/01/20 Cogent Communications Holdings, Inc. Presents at Bank of America’s 2020 Leveraged Finance Virtual Conference, Dec-01-2020 05:15 PM 12/01/20 Other Revised 11/30/20 Cogent Communications Holdings, Inc. Presents at Credit Suisse 24th Annual Technology Virtual Conference, Nov-30-2020 03:00 PM 11/30/20 Earnings Revised 11/05/20 Cogent Communications Holdings, Inc., Q3 2020 Earnings Call, Nov 05, 2020 11/05/20 Other Revised 09/15/20 Cogent Communications Holdings, Inc. Presents at Goldman Sachs 29th Annual Communacopia Conference, Sep-15-2020 02:55 PM 09/15/20 Other Revised 09/14/20 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 2020 Virtual Technology Conference, Sep-14-2020 12:15 PM 09/14/20 Earnings Revised 08/06/20 Cogent Communications Holdings, Inc., Q2 2020 Earnings Call, Aug 06, 2020 08/06/20 Other Revised 06/16/20 Cogent Communications Holdings, Inc. Presents at Credit Suisse 22nd Annual Virtual Communications Conference, Jun-16-2020 09:20 AM 06/16/20 Other Revised 05/13/20 Cogent Communications Holdings, Inc. Presents at J.P. Morgan 48th Annual Global Technology, Media & Communications Conference, May-13-2020 04:00 PM 05/13/20 Earnings Revised 05/07/20 Cogent Communications Holdings, Inc., Q1 2020 Earnings Call, May 07, 2020 05/07/20 Other Revised 05/06/20 Cogent Communications Holdings, Inc. - Shareholder/Analyst Call 05/06/20 Other Revised 03/09/20 Cogent Communications Holdings, Inc. Presents at Deutsche Bank's 28th Annual Media, Internet & Telecom Conference, Mar-09-2020 10:20 AM 03/09/20 Earnings Revised 02/27/20 Cogent Communications Holdings, Inc., Q4 2019 Earnings Call, Feb 27, 2020 02/27/20 Other Revised 01/07/20 Cogent Communications Holdings, Inc. Presents at Citi 2020 Global TMT West Conference, Jan-07-2020 12:30 PM 01/07/20

Other Revised 12/09/19 Cogent Communications Holdings, Inc. Presents at UBS Global Technology, Media & Telecom Conference, Dec-09-2019 11:30 AM 12/09/19 Other Revised 12/03/19 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Leveraged Finance Conference, Dec-03-2019 11:30 AM 12/03/19 Earnings Revised 11/07/19 Cogent Communications Holdings, Inc., Q3 2019 Earnings Call, Nov 07, 2019 11/07/19 Other Revised 09/24/19 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 27th Annual Leveraged Finance Conference, Sep-24-2019 02:15 PM 09/24/19 Other Revised 09/18/19 Cogent Communications Holdings, Inc. Presents at The Goldman Sachs 28th Annual Communacopia Conference, Sep-18-2019 12:25 PM 09/18/19 Other Revised 09/11/19 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2019 Media, Communications & Entertainment Conference, Sep-11-2019 04:00 PM 09/11/19 Earnings Revised 08/08/19 Cogent Communications Holdings, Inc., Q2 2019 Earnings Call, Aug 08, 2019 08/08/19 Other Revised 06/04/19 Cogent Communications Holdings, Inc. Presents at Credit Suisse 21st Annual Communications Conference, Jun-04-2019 02:25 PM 06/04/19 Other Revised 05/15/19 Cogent Communications Holdings, Inc. Presents at J.P. Morgan Global Technology, Media And Communications Conference, May-15-2019 04:20 PM 05/15/19 Earnings Revised 05/02/19 Cogent Communications Holdings, Inc., Q1 2019 Earnings Call, May 02, 2019 05/02/19 Other Revised 03/11/19 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 27th Annual Media, Internet & Telecom Conference, Mar-11-2019 09:30 AM 03/11/19 Earnings Revised 02/21/19 Cogent Communications Holdings, Inc., Q4 2018 Earnings Call, Feb 21, 2019 02/21/19 Other Revised 01/09/19 Cogent Communications Holdings, Inc. Presents at Citi’s 2019 Global TMT West Conference, Jan-09-2019 12:30 PM 01/09/19

Other Revised 12/05/18 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Leveraged Finance Conference, Dec-05-2018 07:30 AM 12/05/18 Other Revised 12/03/18 Cogent Communications Holdings, Inc. Presents at 46th Annual Global Media and Communications Conference, Dec-03-2018 02:30 PM 12/03/18 Other Revised 11/27/18 Cogent Communications Holdings, Inc. Presents at Credit Suisse 22nd Annual Technology, Media & Telecom Conference, Nov-27-2018 02:30 PM 11/27/18 Earnings Revised 11/01/18 Cogent Communications Holdings, Inc., Q3 2018 Earnings Call, Nov 01, 2018 11/01/18 Other Revised 10/04/18 Cogent Communications Holdings, Inc. - Analyst/Investor Day 10/04/18 Other Revised 10/02/18 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 26th Annual Leveraged Financial Conference, Oct-02-2018 11:20 AM 10/02/18 Other Revised 09/12/18 Cogent Communications Holdings, Inc. Presents at Goldman Sachs 27th Annual Communacopia Conference, Sep-12-2018 03:45 PM 09/12/18 Other Revised 09/06/18 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2018 Media, Communications & Entertainment Conference, Sep-06-2018 10:30 AM 09/06/18 Earnings Revised 08/02/18 Cogent Communications Holdings, Inc., Q2 2018 Earnings Call, Aug 02, 2018 08/02/18 Other Revised 06/06/18 Cogent Communications Holdings, Inc. Presents at Morgan Stanley Leveraged Finance Conference, Jun-06-2018 11:45 AM 06/06/18 Other Revised 05/15/18 Cogent Communications Holdings, Inc. Presents at 46th Annual J.P. Morgan Global Technology, Media and Communications Conference, May-15-2018 03:00 PM 05/15/18 Earnings Revised 05/03/18 Cogent Communications Holdings, Inc., Q1 2018 Earnings Call, May 03, 2018 05/03/18 Other Revised 03/06/18 Cogent Communications Holdings, Inc. Presents at 26th Annual Media, Telecom & Business Services Conference, Mar-06-2018 10:25 AM 03/06/18 Earnings Revised 02/22/18 Cogent Communications Holdings, Inc., Q4 2017 Earnings Call, Feb 22, 2018 02/22/18 Other Revised 01/09/18 Cogent Communications Holdings, Inc. Presents at Citi 2018 Global TMT West Conference, Jan-09-2018 02:00 PM 01/09/18

Other Revised 12/04/17 Cogent Communications Holdings, Inc. Presents at UBS 45th Annual Global Media and Communications Conference, Dec-04-2017 04:15 PM 12/04/17 Other Revised 11/29/17 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Leveraged Finance Conference 2017, Nov-29-2017 04:10 PM 11/29/17 Other Revised 11/28/17 Cogent Communications Holdings, Inc. Presents at Credit Suisse 21st Annual Technology, Media & Telecom Conference, Nov-28-2017 09:30 AM 11/28/17 Earnings Revised 11/02/17 Cogent Communications Holdings, Inc., Q3 2017 Earnings Call, Nov 02, 2017 11/02/17 Other Revised 09/12/17 Cogent Communications Holdings, Inc. Presents at Goldman Sachs's 26th Annual Communacopia Conference, Sep-12-2017 02:05 PM 09/12/17 Other Revised 09/07/17 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Media, Communications & Entertainment Conference 2017, Sep-07-2017 09:30 AM 09/07/17 Other Revised 08/07/17 Cogent Communications Holdings, Inc. Presents at Pacific Crest / KeyBanc Capital Markets 19th Annual Global Technology Leadership Forum, Aug-07-2017 11:30 AM 08/07/17 Earnings Revised 08/03/17 Cogent Communications Holdings, Inc., Q2 2017 Earnings Call, Aug 03, 2017 08/03/17 Other Revised 06/14/17 Cogent Communications Holdings, Inc. Presents at The William Blair 2017 Growth Stock Conference, Jun-14-2017 08:40 AM 06/14/17 Other Revised 06/09/17 Cogent Communications Holdings, Inc. Presents at Barclays High Yield Bond and Syndicated Loan Conference, Jun-09-2017 08:50 AM 06/09/17 Other Revised 06/06/17 Cogent Communications Holdings, Inc. Presents at Baird's 2017 Global Consumer, Technology & Services Conference, Jun-06-2017 12:50 PM 06/06/17 Other Revised 06/05/17 Cogent Communications Holdings, Inc. Presents at Stifel 2017 Technology, Internet & Media Conference, Jun-05-2017 04:45 PM 06/05/17 Other Revised 05/31/17 Cogent Communications Holdings, Inc. Presents at Cowen and Company 45th Annual Technology, Media & Telecom Conference, May-31-2017 03:30 PM 05/31/17 Other Revised 05/22/17 Cogent Communications Holdings, Inc. Presents at 45th Annual J.P. Morgan Global Technology, Media and Telecom Conference, May-22-2017 03:00 PM 05/22/17 Other Revised 05/17/17 Cogent Communications Holdings, Inc. Presents at 4th Annual MoffettNathanson Media & Communications Summit, May-17-2017 10:00 AM 05/17/17 Earnings Revised 05/04/17 Cogent Communications Holdings, Inc., Q1 2017 Earnings Call, May 04, 2017 05/04/17 Other Revised 03/07/17 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 25th Annual Media & Telecom Conference, Mar-07-2017 10:25 AM 03/07/17 Other Revised 03/06/17 Cogent Communications Holdings, Inc. Presents at The Raymond James 38th Annual Institutional Investors Conference 2017, Mar-06-2017 04:00 PM 03/06/17 Earnings Revised 02/23/17 Cogent Communications Holdings, Inc., Q4 2016 Earnings Call, Feb 23, 2017 02/23/17 Other Revised 01/04/17 Cogent Communications Holdings, Inc. Presents at Citi 2017 Global Internet, Media & Telecommunications Conference, Jan-04-2017 01:15 PM 01/04/17

Other Revised 12/06/16 Cogent Communications Holdings, Inc. Presents at UBS 44th Annual Global Media and Communications Conference 2016, Dec-06-2016 02:30 PM 12/06/16 Other Revised 11/29/16 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2016 Leveraged Finance Conference, Nov-29-2016 09:30 AM 11/29/16 Other Revised 11/10/16 Cogent Communications Holdings, Inc. Presents at Morgan Stanley Leveraged Finance Conference, Nov-10-2016 11:00 AM 11/10/16 Earnings Revised 11/03/16 Cogent Communications Holdings, Inc., Q3 2016 Earnings Call, Nov 03, 2016 11/03/16 Other Revised 09/27/16 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 24th Annual Leveraged Finance Conference, Sep-27-2016 09:15 PM 09/27/16 Other Revised 09/14/16 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2016 Media, Communications & Entertainment Conference, Sep-14-2016 01:35 PM 09/14/16 Earnings Revised 08/04/16 Cogent Communications Holdings, Inc., Q2 2016 Earnings Call, Aug 04, 2016 08/04/16 Other Revised 06/09/16 Cogent Communications Holdings, Inc. Presents at Barclays High Yield Bond & Syndicated Loan Conference, Jun-09-2016 09:30 AM 06/09/16 Other Revised 05/23/16 Cogent Communications Holdings, Inc. Presents at 44th Annual J.P. Morgan Global Technology, Media and Telecom Conference, May-23-2016 08:40 AM 05/23/16 Other Revised 05/17/16 Cogent Communications Holdings, Inc. Presents at Goldman Sachs Leveraged Financial Conference 2016, May-17-2016 02:10 PM 05/17/16 Earnings Revised 05/05/16 Cogent Communications Holdings, Inc., Q1 2016 Earnings Call, May 05, 2016 05/05/16 Other Revised 03/08/16 Cogent Communications Holdings, Inc. Presents at 2016 Deutsche Bank Securities 24th Annual Media, Internet & Telecom Conference, Mar-08-2016 02:45 PM 03/08/16 Other Revised 03/03/16 Cogent Communications Holdings, Inc. Presents at Morgan Stanley Technology, Media & Telecom Conference, Mar-03-2016 08:10 AM 03/03/16 Earnings Revised 02/25/16 Cogent Communications Holdings, Inc., Q4 2015 Earnings Call, Feb 25, 2016 02/25/16 Other Revised 01/06/16 Cogent Communications Holdings, Inc. Presents at Citi Global Internet, Media and Telecommunications Conference, Jan-06-2016 04:15 PM 01/06/16

Other Revised 12/08/15 Cogent Communications Holdings, Inc. Presents at UBS 43rd Annual Global Media and Communications Conference 2015, Dec-08-2015 03:15 PM 12/08/15 Other Revised 12/03/15 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2015 Leveraged Financial Conference, Dec-03-2015 04:25 PM 12/03/15 Earnings Revised 11/05/15 Cogent Communications Holdings, Inc., Q3 2015 Earnings Call, Nov 05, 2015 11/05/15 Other Revised 09/29/15 Cogent Communications Group Inc. Presents at Deutsche Bank Leveraged Finance Conference 2015, Sep-29-2015 08:00 AM 09/29/15 Other Revised 09/09/15 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Media, Communications & Entertainment Conference, Sep-09-2015 04:45 PM 09/09/15 Earnings Revised 08/06/15 Cogent Communications Holdings, Inc., Q2 2015 Earnings Call, Aug 06, 2015 08/06/15 Other Revised 06/11/15 Cogent Communications Holdings, Inc. Presents at Barclays High Yield Bond and Syndicated Loan Conference, Jun-11-2015 04:05 PM 06/11/15 Other Revised 06/04/15 Cogent Communications Holdings, Inc. Presents at Morgan Stanley Leveraged Finance Conference, Jun-04-2015 10:15 AM 06/04/15 Other Revised 05/18/15 Cogent Communications Holdings, Inc. Presents at 43rd Annual J.P. Morgan Global Technology, Media and Telecom Conference, May-18-2015 10:00 AM 05/18/15 Earnings Revised 05/07/15 Cogent Communications Holdings, Inc., Q1 2015 Earnings Call, May 07, 2015 05/07/15 Other Revised 03/11/15 Cogent Communications Holdings, Inc. Presents at The Goldman Sachs Sixth Annual TMT Leveraged Finance Conference, Mar-11-2015 11:40 AM 03/11/15 Other Revised 03/09/15 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 23rd Annual Media, Internet and Telecom Conference, Mar-09-2015 10:45 AM 03/09/15 Other Revised 03/04/15 Cogent Communications Holdings, Inc. Presents at Morgan Stanley 2015 Technology, Media & Telecom Conference, Mar-04-2015 03:05 PM 03/04/15 Earnings Revised 02/25/15 Cogent Communications Holdings, Inc., Q4 2014 Earnings Call, Feb 25, 2015 02/25/15 Other Revised 01/06/15 Cogent Communications Holdings, Inc. Presents at Citi 25th Annual Global Internet, Media and Telecom Conference 2015, Jan-06-2015 10:15 AM 01/06/15

Other Revised 12/10/14 Cogent Communications Holdings, Inc. Presents at UBS 42nd Annual Global Media and Communications Conference, Dec-10-2014 01:30 PM 12/10/14 Other Revised 12/02/14 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch 2014 Leveraged Finance Conference, Dec-02-2014 11:30 AM 12/02/14 Earnings Revised 11/07/14 Cogent Communications Holdings, Inc., Q3 2014 Earnings Call, Nov 07, 2014 11/07/14 Other Revised 09/30/14 Cogent Communications Holdings, Inc. Presents at Deutsche Bank 22nd Annual Leveraged Finance Conference, Sep-30-2014 04:00 PM 09/30/14 Other Revised 09/17/14 Cogent Communications Holdings, Inc. Presents at Bank of America Merrill Lynch Media, Communications & Entertainment Conference 2014, Sep-17-2014 02:20 PM 09/17/14 Earnings Revised 08/07/14 Cogent Communications Holdings, Inc., Q2 2014 Earnings Call, Aug 07, 2014 08/07/14 Other Revised 05/19/14 Cogent Communications Group Inc. Presents at J.P. Morgan Global Technology, Media & Telecom Conference, May-19-2014 03:00 PM 05/19/14 Other Revised 05/13/14 Cogent Communications Group, Inc. Presents at Barclays High Yield Bond & Syndicated Loan Conference, May-13-2014 04:05 PM 05/13/14 Earnings Revised 05/08/14 Cogent Communications Group, Inc., Q1 2014 Earnings Call, May 08, 2014 05/08/14 Other Revised 03/19/14 Cogent Communications Group, Inc. Presents at Bank of America Merrill Lynch Smid Cap Conference, Mar-19-2014 02:20 PM 03/19/14 Other Revised 03/12/14 Cogent Communications Group, Inc. Presents at Deutsche Bank 22nd Annual Media, Internet and Telecom Conference, Mar-12-2014 10:55 AM 03/12/14 Other Revised 02/24/14 Cogent Communications Group Inc. Presents at J.P. Morgan Global High Yield & Leveraged Finance Conference, Feb-24-2014 02:00 PM 02/24/14 Earnings Revised 02/20/14 Cogent Communications Group, Inc., 2013 Earnings Call, Feb 20, 2014 02/20/14 Other Revised 01/06/14 Cogent Communications Group Inc. Presents at Citi 2014 Global Internet, Media & Telecommunications Conference, Jan-06-2014 01:30 PM 01/06/14

Other Revised 12/11/13 Cogent Communications Group Inc. Presents at UBS 41st Annual Global Media & Communication Conference, Dec-11-2013 02:30 PM 12/11/13 Other Revised 12/10/13 Cogent Communications Group Inc. Presents at JPMorgan Small/MidCap Conference, Dec-10-2013 10:15 AM 12/10/13 Other Revised 12/03/13 Cogent Communications Group Inc. Presents at Bank of America Merrill Lynch 2013 Leveraged Finance Conference, Dec-03-2013 02:50 PM 12/03/13 Other Revised 11/18/13 Cogent Communications Group Inc. Presents at Barclays Select Growth Conference, Nov-18-2013 03:35 PM 11/18/13 Other Revised 11/14/13 Cogent Communications Group Inc. Presents at Goldman Sachs US Emerging/SMID Cap Growth Conference, Nov-14-2013 03:20 PM 11/14/13 Earnings Revised 11/08/13 Cogent Communications Group Inc., Q3 2013 Earnings Call, Nov 08, 2013 11/08/13 Other Revised 10/01/13 Cogent Communications Group Inc. Presents at Deutsche Bank's 21st Annual Leveraged Finance Conference, Oct-01-2013 03:00 PM 10/01/13 Other Revised 09/12/13 Cogent Communications Group Inc. Presents at Bank of America Merrill Lynch 2013 Media, Communications & Entertainment Conference, Sep-12-2013 02:20 PM 09/12/13 Earnings Revised 08/08/13 Cogent Communications Group Inc., Q2 2013 Earnings Call, Aug 08, 2013 08/08/13 Other Revised 05/23/13 Cogent Communications Group Inc. Presents at Barclays Global Technology, Media and Telecommunications Conference, May-23-2013 04:40 PM 05/23/13 Other Revised 05/15/13 Cogent Communications Group Inc. Presents at JPMorgan Chase & Co.'s 41st Annual Global Technology, Media and Telecom Conference, May-15-2013 03:30 PM 05/15/13 Other Revised 05/08/13 Cogent Communications Group Inc. Presents at Merrill Lynch & Co., Inc.'s 2013 Smid Cap Conference, May-08-2013 12:25 PM 05/08/13 Earnings Revised 05/07/13 Cogent Communications Group Inc., Q1 2013 Earnings Call, May 07, 2013 05/07/13 Other Revised 03/04/13 Cogent Communications Group Inc. Presents at Deutsche Bank's DbAccess 21st Annual Media and Telecom Conference, Mar-04-2013 10:50 AM 03/04/13 Other Revised 02/26/13 Cogent Communications Group Inc. Presents at Morgan Stanley Technology, Media & Telecom Conference, Feb-26-2013 05:00 PM 02/26/13 Earnings Revised 02/21/13 Cogent Communications Group Inc., Q4 2012 Earnings Call, Feb 21, 2013 02/21/13 Other Revised 01/09/13 Cogent Communications Group Inc. Presents at Citigroup Global Internet, Media & Telecommunications Conference, Jan-09-2013 09:45 AM 01/09/13

Other Revised 12/04/12 Cogent Communications Group Inc. Presents at 2012 Bank of America Merrill Lynch Leveraged Finance Conference, Dec-04-2012 08:10 AM 12/04/12 Other Revised 12/03/12 Cogent Communications Group Inc. Presents at UBS 40th Annual Global Media and Communications Conference, Dec-03-2012 11:00 AM 12/03/12 Earnings Revised 11/06/12 Cogent Communications Group Inc., Q3 2012 Earnings Call, Nov 06, 2012 11/06/12 Other Revised 10/10/12 Cogent Communications Group Inc. Presents at Deutsche Bank Securities 20th Annual Leveraged Finance Conference, Oct-10-2012 01:00 PM 10/10/12 Other Revised 09/13/12 Cogent Communications Group Inc. Presents at BofA Merrill Lynch 2012 Media, Communications and Entertainment Conference, Sep-13-2012 08:45 AM 09/13/12 Earnings Revised 08/09/12 Cogent Communications Group Inc., Q2 2012 Earnings Call, Aug 09, 2012 08/09/12 Other Revised 05/22/12 Cogent Communications Group Inc. Presents at Barclays Capital Global Technology, Media and Telecommunications Conference, May-22-2012 09:30 AM 05/22/12 Other Revised 05/16/12 Cogent Communications Group Inc. Presents at JPMorgan's 40th Annual Global Technology, Media and Telecom Conference, May-16-2012 04:10 PM 05/16/12 Earnings Revised 05/03/12 Cogent Communications Group Inc., Q1 2012 Earnings Call, May 03, 2012 05/03/12 Other Revised 02/27/12 Cogent Communications Group Inc. Presents at Deutsche Bank Securities 20th Annual Media and Telecom Conference, Feb-27-2012 03:00 PM 02/27/12 Earnings Revised 02/22/12 Cogent Communications Group Inc., 2011 Earnings Call, Feb 22, 2012 02/22/12 Other Revised 01/04/12 Cogent Communications Group Inc. Presents at Citi Global Entertainment, Media & Telecommunications Conference, Jan-04-2012 09:50 AM 01/04/12

Other Revised 12/05/11 Cogent Communications Group Inc. Presents at The UBS 39th Annual Global Media and Communications Conference, Dec-05-2011 08:00 AM 12/05/11 Other Revised 12/01/11 Cogent Communications Group Inc. Presents at Bank of America Merrill Lynch Leveraged Finance Conference, Dec-01-2011 08:50 AM 12/01/11 Other Revised 11/16/11 Cogent Communications Group Inc. Presents at Citi's 8th Annual Small/Mid Cap Conference, Nov-16-2011 10:50 AM 11/16/11 Earnings Revised 11/03/11 Cogent Communications Group Inc., Q3 2011 Earnings Call, Nov 03, 2011 11/03/11 Other Revised 10/12/11 Cogent Communications Group Inc. Presents at Deutsche Bank's 19th Annual Leveraged Finance Conference, Oct-12-2011 02:50 PM 10/12/11 Other Revised 09/15/11 Cogent Communications Group Inc. Presents at Bank of America Merrill Lynch 2011 Media, Communications & Entertainment Conference, Sep-15-2011 02:20 PM 09/15/11 Earnings Revised 08/04/11 Cogent Communications Group Inc., Q2 2011 Earnings Call, Aug 04, 2011 08/04/11 Other Revised 05/25/11 Cogent Communications Group Inc. Presents at The Barclays Capital 2011 Global Communications, Media and Technology Conference, May-25-2011 01:45 PM 05/25/11 Other Revised 05/16/11 Cogent Communications Group Inc. Presents at J.P. Morgan 39th Annual Global Technology, Media and Telecom (TMT) Conference, May-16-2011 02:10 PM 05/16/11 Earnings Revised 05/05/11 Cogent Communications Group Inc., Q1 2011 Earnings Call, May 05, 2011 05/05/11 Earnings Revised 02/24/11 Cogent Communications Group Inc., Q4 2010 Earnings Call, Feb 24, 2011 02/24/11

Earnings Revised 11/04/10 Cogent Communications Group Inc., Q3 2010 Earnings Call, Nov 04, 2010 11/04/10 Earnings Revised 08/05/10 Cogent Communications Group Inc., Q2 2010 Earnings Call, Aug-05-2010 08/05/10 Earnings Revised 05/06/10 Cogent Communications Group Inc., Q1 2010 Earnings Call, May-06-2010 05/06/10 Earnings Revised 02/25/10 Cogent Communications Group Inc., Q4 2009 Earnings Call, Feb-25-2010 02/25/10

Earnings Revised 11/09/09 Cogent Communications Group Inc., Q3 2009 Earnings Call, Nov-09-2009 11/09/09 Earnings Revised 08/07/09 Cogent Communications Group Inc., Q2 2009 Earnings Call, Aug-07-2009 08/07/09 Earnings Revised 05/08/09 Cogent Communications Group Inc., Q1 2009 Earnings Call, May-08-2009 05/08/09 Earnings Revised 02/26/09 Cogent Communications Group Inc., Q4 2008 Earnings Call, Feb-26-2009 02/26/09

Earnings Revised 11/06/08 Cogent Communications Group Inc., Q3 2008 Earnings Call, Nov-06-2008 11/06/08 Earnings Revised 08/08/08 Cogent Communications Group Inc., Q2 2008 Earnings Call, Aug-08-2008 08/08/08 Earnings Revised 05/09/08 Cogent Communications Group Inc., Q1 2008 Earnings Call, May-09-2008 05/09/08 Earnings Revised 02/27/08 Cogent Communications Group Inc., Q4 2007 Earnings Call, Feb-27-2008 02/27/08

Earnings Revised 11/07/07 Cogent Communications Group Inc., Q3 2007 Earnings Call, Nov-07-2007 11/07/07