| 2009-09-10 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 10,000 0.0222% | $11.03 | $110,319 | -12.12% | |
| 2009-08-07 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 40,000 0.0912% | $11.01 | $440,324 | -8.36% | |
| 2007-08-21 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 20,000 0.0424% | $26.07 | $521,336 | -24.6% | |
| 2007-08-20 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 60,000 0.0773% | $15.55 | $933,090 | -23.24% | |
| 2007-07-20 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 80,000 0.1034% | $19.98 | $1.6M | -36.65% | |
| 2007-06-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0101% | $16.37 | $130,924 | -16.72% | |
| 2007-06-01 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0103% | $17.25 | $138,022 | -17.3% | |
| 2007-05-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0105% | $14.64 | $117,160 | +1.13% | |
| 2007-05-01 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0104% | $15.55 | $124,371 | -4.96% | |
| 2007-04-16 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0102% | $16.11 | $128,840 | -8.36% | |
| 2007-04-02 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0102% | $14.85 | $118,762 | +0.68% | |
| 2007-03-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0104% | $14.53 | $116,239 | +5.54% | |
| 2007-03-01 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0102% | $13.96 | $111,700 | +7.84% | |
| 2007-02-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.01% | $14.50 | $116,009 | +2.63% | |
| 2007-02-01 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0107% | $13.54 | $108,309 | +16.87% | |
| 2007-01-16 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0106% | $13.17 | $105,325 | +18.7% | |
| 2007-01-03 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0114% | $11.28 | $90,274 | +49.23% | |
| 2006-12-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 6,806 0.014% | $15.67 | $106,619 | +54.85% | |
| 2006-12-01 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 6,702 0.0136% | $15.66 | $104,924 | +52.7% | |
| 2006-11-15 | Sale | Cogent Communications Holdings, Inc. CCOI | President & COO | 8,000 0.0164% | $15.93 | $127,453 | +52.2% |