| 2023-06-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 4,202 0.0089% | $65.00 | $273,130 | +0.74% | |
| 2023-05-11 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,798 0.0082% | $65.00 | $246,875 | +3.87% | |
| 2021-05-03 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,750 0.0124% | $76.08 | $437,486 | -1.71% | |
| 2019-03-12 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 9,900 0.0219% | $50.13 | $496,280 | +20.35% | |
| 2018-05-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,000 0.0044% | $50.65 | $101,298 | +3.06% | |
| 2018-05-08 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0109% | $48.34 | $241,697 | +6.8% | |
| 2017-08-07 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 10,000 0.0224% | $43.25 | $432,495 | +9.89% | |
| 2017-03-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,000 0.0067% | $41.77 | $125,315 | +7.61% | |
| 2016-03-01 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0113% | $37.71 | $188,574 | +5.1% | |
| 2016-02-29 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0113% | $36.87 | $184,369 | +7.95% | |
| 2014-01-02 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,000 0.0043% | $39.88 | $79,768 | -11.17% | |
| 2013-10-01 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,000 0.0043% | $32.27 | $64,530 | +9.53% | |
| 2013-07-01 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,000 0.0043% | $28.30 | $56,592 | +25.63% | |
| 2013-06-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,000 0.0065% | $27.67 | $83,013 | +29.4% | |
| 2012-09-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.011% | $20.93 | $104,634 | +25.52% | |
| 2010-11-09 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 32,835 0.0742% | $11.75 | $385,765 | +22.98% | |
| 2010-01-05 | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0111% | $9.93 | $49,650 | +0.9% | ||
| 2009-08-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 600 0.0014% | $11.15 | $6,690 | -5.36% | |
| 2009-01-05 | Cogent Communications Holdings, Inc. CCOI | director | 11,000 0.0254% | $6.64 | $73,095 | +25.45% | ||
| 2006-11-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 1.9M 3.5246% | $14.64 | $27.82M | +49.57% |