| 2018-11-08 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,500 0.0055% | $51.01 | $127,523 | +12.84% | |
| 2018-03-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 1,700 0.0038% | $43.60 | $74,120 | +16.12% | |
| 2017-12-15 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,125 0.0048% | $47.02 | $99,921 | +10.38% | |
| 2017-09-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 1,616 0.0036% | $45.97 | $74,288 | +5.24% | |
| 2017-09-01 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 1,100 0.0025% | $46.69 | $51,359 | +3.32% | |
| 2017-06-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,383 0.0053% | $40.15 | $95,677 | +13.68% | |
| 2017-03-14 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,369 0.0053% | $40.51 | $95,968 | +10.6% | |
| 2017-02-27 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,450 0.0055% | $42.40 | $103,880 | +6.38% | |
| 2016-09-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,822 0.0063% | $35.57 | $100,379 | +17.06% | |
| 2016-03-17 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,600 0.0081% | $37.44 | $134,784 | +5.46% | |
| 2015-06-09 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,200 0.0071% | $30.56 | $97,789 | +11.34% | |
| 2013-09-13 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,500 0.0054% | $30.99 | $77,475 | +15.73% | |
| 2013-05-09 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 10,000 0.0218% | $29.15 | $291,500 | +21.91% | |
| 2012-08-21 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,500 0.0055% | $19.90 | $49,750 | +26.3% | |
| 2012-08-17 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 2,500 0.0054% | $19.70 | $49,250 | +27.41% | |
| 2012-08-13 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0109% | $19.12 | $95,623 | +30.36% | |
| 2012-03-01 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0111% | $19.00 | $95,000 | +6.61% | |
| 2012-02-24 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 20,000 0.0444% | $17.53 | $350,600 | +14.5% | |
| 2011-01-06 | Cogent Communications Holdings, Inc. CCOI | director | 4,370 0.01% | $14.30 | $62,491 | +5.86% | ||
| 2010-01-05 | Cogent Communications Holdings, Inc. CCOI | director | 7,379 0.0168% | $10.14 | $74,849 | +0.9% |