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CCOI - As of  06/23/25, 03:15:52 AM:   131 Insider Transactions.

Sector: Technology    Industry: Diversified Communication Services
Prev Close:$42.69  Avg Vol(3m): 380,292  P/E: 194.00  EPS: 0.22

Email this page to a friend.    Insider Transactions for CCOI

Buy/Sell* Filed Date Subject Symbol Acquirer Pct Owned Details
B 2020-02-13 11:29:29.0 COGENT COMMUNICATIONS HOLDINGS CCOI RENAISSANCE TECHNOLOGIES LLC 7.66% view
S 2020-02-11 19:29:22.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 10.05% view
S 2020-02-04 11:53:15.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 14.7% view
B 2019-05-10 12:06:56.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 10.3% view
B 2019-02-13 10:18:16.0 COGENT COMMUNICATIONS HOLDINGS CCOI RENAISSANCE TECHNOLOGIES LLC 7.35% view
S 2019-02-11 08:55:48.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 9.84% view
B 2019-01-24 13:43:52.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 14.8% view
B 2018-03-12 12:30:13.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 10.01% view
B 2018-02-14 11:27:48.0 COGENT COMMUNICATIONS HOLDINGS CCOI RENAISSANCE TECHNOLOGIES LLC 6.04% view
S 2018-02-13 09:35:34.0 COGENT COMMUNICATIONS HOLDINGS CCOI FMR LLC 4.478% view
S 2018-02-08 19:45:19.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 9.93% view
S 2018-02-07 10:15:03.0 COGENT COMMUNICATIONS HOLDINGS CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 2.734% view
B 2018-01-19 14:03:41.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 13.7% view
S 2017-02-14 10:55:12.0 COGENT COMMUNICATIONS HOLDINGS CCOI FMR LLC 6.475% view
S 2017-02-10 16:08:03.0 COGENT COMMUNICATIONS HOLDINGS CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 6.26% view
S 2017-02-10 09:41:50.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 10.32% view
B 2017-01-12 11:22:50.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 10.3% view
B 2016-08-10 08:27:45.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 10.33% view
B 2016-05-10 11:17:58.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 10.0% view
B 2016-02-12 09:01:36.0 COGENT COMMUNICATIONS HOLDINGS CCOI FMR LLC 11.22% view
S 2016-02-11 18:10:36.0 COGENT COMMUNICATIONS HOLDINGS CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 8.64% view
B 2016-02-11 10:31:19.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 7.7% view
B 2016-01-26 08:19:30.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 6.8% view
S 2015-10-05 09:34:34.0 COGENT COMMUNICATIONS HOLDINGS CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC n/a view
B 2015-07-10 07:47:17.0 COGENT COMMUNICATIONS HOLDINGS CCOI FMR LLC 10.523% view
B 2015-02-13 10:09:45.0 COGENT COMMUNICATIONS HOLDINGS CCOI FMR LLC 7.661% view
B 2015-02-12 17:58:30.0 COGENT COMMUNICATIONS HOLDINGS CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 9.86% view
S 2015-02-12 09:41:25.0 COGENT COMMUNICATIONS HOLDINGS CCOI Sarbit Advisory Services Inc 0.0% view
B 2015-02-11 10:24:09.0 COGENT COMMUNICATIONS HOLDINGS CCOI VANGUARD GROUP INC 6.33% view
B 2015-02-11 09:24:00.0 COGENT COMMUNICATIONS HOLDINGS CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC 5.1% view
S 2015-02-09 13:17:19.0 COGENT COMMUNICATIONS HOLDINGS CCOI JENNISON ASSOCIATES LLC 2.3% view
S 2015-02-06 17:52:13.0 COGENT COMMUNICATIONS HOLDINGS CCOI BlackRock Inc 5.5% view
S 2015-02-02 11:54:03.0 COGENT COMMUNICATIONS HOLDINGS CCOI PRUDENTIAL FINANCIAL INC 2.3% view
S 2014-02-14 06:47:32.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 1.785% view
B 2014-02-12 11:57:03.0 COGENT COMMUNICATIONS GROUP INC CCOI VANGUARD GROUP INC 5.9% view
B 2014-02-12 10:40:21.0 COGENT COMMUNICATIONS GROUP INC CCOI Sarbit Advisory Services Inc 6.62% view
B 2014-02-06 17:01:43.0 COGENT COMMUNICATIONS GROUP INC CCOI JENNISON ASSOCIATES LLC 5.6% view
B 2014-02-05 10:20:50.0 COGENT COMMUNICATIONS GROUP INC CCOI PRUDENTIAL FINANCIAL INC 5.6% view
B 2014-01-28 15:23:00.0 COGENT COMMUNICATIONS GROUP INC CCOI BlackRock Inc 5.6% view
S 2013-02-14 13:51:40.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 5.718% view
S 2013-02-14 12:56:49.0 COGENT COMMUNICATIONS GROUP INC CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 7.823% view
S 2013-02-14 11:29:53.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC n/a view
B 2013-02-14 09:34:31.0 COGENT COMMUNICATIONS GROUP INC CCOI Sarbit Advisory Services Inc 5.85% view
B 2013-02-12 15:44:02.0 COGENT COMMUNICATIONS GROUP INC CCOI VANGUARD GROUP INC 5.85% view
S 2013-02-08 16:18:46.0 COGENT COMMUNICATIONS GROUP INC CCOI BlackRock Inc 5.28% view
S 2012-02-14 16:50:36.0 COGENT COMMUNICATIONS GROUP INC CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 8.708% view
S 2012-02-14 12:13:40.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 7.548% view
B 2012-02-13 14:48:13.0 COGENT COMMUNICATIONS GROUP INC CCOI BlackRock Inc 5.33% view
S 2012-02-10 15:46:26.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC 5.5% view
S 2012-02-08 10:35:53.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 3.1% view
B 2012-02-07 16:14:42.0 COGENT COMMUNICATIONS GROUP INC CCOI VANGUARD GROUP INC 5.31% view
S 2012-02-02 15:25:00.0 COGENT COMMUNICATIONS GROUP INC CCOI PENINSULA CAPITAL ADVISORS LLC 0.0% view
S 2011-07-11 13:49:33.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 8.414% view
S 2011-02-17 13:32:40.0 COGENT COMMUNICATIONS GROUP INC CCOI PRICE T ROWE ASSOCIATES INC 1.8% view
B 2011-02-14 18:38:30.0 COGENT COMMUNICATIONS GROUP INC CCOI FRONTIER CAPITAL MANAGEMENT CO LLC 9.246% view
B 2011-02-14 17:43:27.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 13.526% view
B 2011-02-11 18:06:56.0 COGENT COMMUNICATIONS GROUP INC CCOI PENINSULA CAPITAL ADVISORS LLC 9.2% view
S 2011-02-10 17:16:52.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC 6.1% view
S 2011-02-09 12:24:57.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 6.5% view
S 2010-12-08 14:33:50.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LLC 6.5% view
B 2010-10-08 12:18:39.0 COGENT COMMUNICATIONS GROUP INC CCOI BlackRock Inc 4.88% view
S 2010-02-16 12:47:08.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 10.642% view
S 2010-02-12 16:47:20.0 COGENT COMMUNICATIONS GROUP INC CCOI CHILTON INVESTMENT CO LLC 2.1% view
S 2010-02-12 13:10:56.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 7.8% view
B 2010-02-10 13:41:09.0 COGENT COMMUNICATIONS GROUP INC CCOI PENINSULA INVESTMENT PARTNERS 9.87% view
B 2010-02-09 15:03:33.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LP 11.9% view
B 2009-12-10 16:13:22.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC 10.659% view
S 2009-09-10 16:05:37.0 COGENT COMMUNICATIONS GROUP INC CCOI CHILTON INVESTMENT CO LLC 5.6% view
S 2009-06-17 11:12:04.0 COGENT COMMUNICATIONS GROUP INC CCOI Norges Bank 4.85% view
S 2009-04-09 16:52:36.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC n/a view
B 2009-03-09 09:56:55.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LP 11.47% view
S 2009-02-17 15:33:09.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 7.9% view
B 2009-02-17 08:12:06.0 COGENT COMMUNICATIONS GROUP INC CCOI SHUMWAY CAPITAL PARTNERS LLC 12.0% view
B 2009-02-12 16:35:52.0 COGENT COMMUNICATIONS GROUP INC CCOI PRICE T ROWE ASSOCIATES INC 10.6% view
B 2009-01-26 14:15:32.0 COGENT COMMUNICATIONS GROUP INC CCOI PENINSULA INVESTMENT PARTNERS LP 8.97% view
S 2009-01-22 09:15:15.0 COGENT COMMUNICATIONS GROUP INC CCOI Norges Bank 5.16% view
B 2008-11-10 16:10:59.0 COGENT COMMUNICATIONS GROUP INC CCOI CHILTON INVESTMENT CO LLC 11.9% view
S 2008-09-10 15:58:13.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC n/a view
B 2008-09-04 12:45:53.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LP 10.72% view
S 2008-06-10 09:32:43.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC n/a view
B 2008-05-27 14:58:21.0 COGENT COMMUNICATIONS GROUP INC CCOI Norges Bank 5.16% view
B 2008-03-10 16:17:42.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 10.6% view
B 2008-03-10 14:33:21.0 COGENT COMMUNICATIONS GROUP INC CCOI PRICE T ROWE ASSOCIATES INC 10.0% view
B 2008-02-19 14:47:18.0 COGENT COMMUNICATIONS GROUP INC CCOI PBK HOLDINGS INC 5.3% view
S 2008-02-14 16:19:48.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR LLC n/a view
B 2008-02-14 15:27:56.0 COGENT COMMUNICATIONS GROUP INC CCOI MORGAN STANLEY 9.6% view
S 2008-02-13 19:07:34.0 COGENT COMMUNICATIONS GROUP INC CCOI TREMBLANT CAPITAL GROUP 5.1% view
S 2008-02-13 12:25:10.0 COGENT COMMUNICATIONS GROUP INC CCOI ZIFF ASSET MANAGEMENT LP 2.0% view
B 2008-02-13 09:34:58.0 COGENT COMMUNICATIONS GROUP INC CCOI PRICE T ROWE ASSOCIATES INC 8.3% view
B 2008-01-22 16:23:31.0 COGENT COMMUNICATIONS GROUP INC CCOI COLUMBIA WANGER ASSET MANAGEMENT LP 7.79% view
S 2007-12-12 11:47:53.0 COGENT COMMUNICATIONS GROUP INC CCOI Schreiber Suydam Van Zandt 4.77% view
B 2007-12-10 16:17:20.0 COGENT COMMUNICATIONS GROUP INC CCOI SHUMWAY CAPITAL PARTNERS LLC 6.6% view
B 2007-08-17 14:27:57.0 COGENT COMMUNICATIONS GROUP INC CCOI Schreiber Suydam Van Zandt 5.02% view
B 2007-08-09 17:25:30.0 COGENT COMMUNICATIONS GROUP INC CCOI TREMBLANT CAPITAL GROUP 5.6% view
S 2007-06-27 12:14:12.0 COGENT COMMUNICATIONS GROUP INC CCOI BNP EUROPE TE LECOM & MEDIA FUND II LP 0.0% view
S 2007-02-14 14:41:18.0 COGENT COMMUNICATIONS GROUP INC CCOI OAK MANAGEMENT CORP 0.1% view
B 2007-02-01 17:04:39.0 COGENT COMMUNICATIONS GROUP INC CCOI ZIFF ASSET MANAGEMENT LP 6.2% view
S 2006-12-11 17:16:36.0 COGENT COMMUNICATIONS GROUP INC CCOI FMR CORP n/a view
S 2006-11-29 11:33:50.0 COGENT COMMUNICATIONS GROUP INC CCOI BNP EUROPE TE LECOM & MEDIA FUND II LP 5.83% view
S 2006-11-20 15:44:39.0 COGENT COMMUNICATIONS GROUP INC CCOI WORLDVIEW TECHNOLOGY PARTNERS IV LP 2.9% view
S 2006-11-17 18:39:09.0 COGENT COMMUNICATIONS GROUP INC CCOI JERUSALEM VENTURE PARTNERS IV LP 5.0% view
S 2006-09-18 18:38:02.0 COGENT COMMUNICATIONS GROUP INC CCOI JERUSALEM VENTURE PARTNERS IV LP 8.4% view
S 2006-07-03 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI WORLDVIEW TECHNOLOGY PARTNERS IV LP 5.8% view
S 2006-06-23 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 7.9% view
S 2006-06-23 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI JERUSALEM VENTURE PARTNERS IV LP 10.0% view
S 2006-06-16 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BNP EUROPE TE LECOM & MEDIA FUND II LP 7.94% view
S 2006-05-10 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI FMR CORP n/a view
S 2006-02-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI Cisco Systems Capital CORP 3.9% view
B 2006-02-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI FMR CORP n/a view
S 2005-06-27 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI Cisco Systems Capital CORP 8.0% view
S 2005-06-27 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI Cisco Systems Capital CORP 8.0% view
S 2005-04-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BNP EUROPE TE LECOM & MEDIA FUND II LP 12.68% view
S 2005-03-16 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BCP CAPITAL 6.687% view
S 2005-02-23 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 14.6% view
B 2005-02-17 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI Cisco Systems Capital CORP 10.5% view
S 2004-12-17 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BNP EUROPE TE LECOM & MEDIA FUND II LP 12.68% view
B 2004-11-08 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI PETERSON KENNETH D JR 9.56% view
S 2004-08-05 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BNP EUROPE TE LECOM & MEDIA FUND II LP 14.4% view
S 2004-04-21 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BROADVIEW CAPITAL PARTNERS LP 7.809% view
B 2004-04-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BNP EUROPE TE LECOM & MEDIA FUND II LP 15.1% view
S 2004-04-09 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI JERUSALEM VENTURE PARTNERS IV LP 19.1% view
S 2004-04-09 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI WORLDVIEW TECHNOLOGY PARTNERS IV LP 12.8% view
S 2004-04-06 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 15.4% view
B 2003-08-11 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI BROADVIEW CAPITAL PARTNERS LP 9.795% view
B 2003-08-11 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI WORLDVIEW TECHNOLOGY PARTNERS IV LP 17.76% view
B 2003-08-11 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI JERUSALEM VENTURE PARTNERS IV LP 23.72% view
B 2003-08-08 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 18.0% view
B 2003-02-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI JERUSALEM VENTURE PARTNERS L P 21.75% view
B 2003-02-14 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI WORLDVIEW TECHNOLOGY PARTNERS IV LP 17.06% view
B 2003-02-07 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 14.9% view
B 2002-02-19 00:00:00.0 COGENT COMMUNICATIONS GROUP INC COI OAK MANAGEMENT CORP 14.71% view
* Institutions do not report transaction buy/sell types directly. To help members better understand the transactions, this column is filled by InsiderCow's best-effort interpretations.