| 10 Sept 2009 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 6.00 USD | |
| 10 Sept 2009 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 11.03 USD | |
| 10 Sept 2009 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 0.00 USD | deriv |
| 07 Aug 2009 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 6.00 USD | |
| 07 Aug 2009 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 11.01 USD | |
| 07 Aug 2009 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 0.00 USD | deriv |
| 28 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 15,000 | 6.00 USD | |
| 28 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 15,000 | 0.00 USD | deriv |
| 20 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 30,000 | 6.00 USD | |
| 21 Aug 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 26.07 USD | |
| 21 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 6.00 USD | |
| 20 Aug 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 30,000 | 25.10 USD | |
| 20 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 30,000 | 0.00 USD | deriv |
| 21 Aug 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 10,000 | 0.00 USD | deriv |
| 20 Jul 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 33.96 USD | |
| 20 Jul 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 6.00 USD | |
| 20 Jul 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 40,000 | 0.00 USD | deriv |
| 15 Jun 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 6.00 USD | |
| 15 Jun 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 26.73 USD | |
| 15 Jun 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 0.00 USD | deriv |
| 01 Jun 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 6.00 USD | |
| 01 Jun 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 28.51 USD | |
| 01 Jun 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 0.00 USD | deriv |
| 15 May 2007 | SALE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 23.29 USD | |
| 15 May 2007 | EXERCISE | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,000 | 6.00 USD | |