| 2019-08-21 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0109% | $59.90 | $299,518 | +25.03% | |
| 2017-12-05 | Cogent Communications Holdings, Inc. CCOI | director | 700 0.0016% | $45.30 | $31,710 | +14.1% | ||
| 2017-02-27 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,000 0.0112% | $42.38 | $211,903 | +6.38% | |
| 2015-03-12 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 4,000 0.0087% | $34.37 | $137,482 | -4.35% | |
| 2015-02-27 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,000 0.0066% | $36.57 | $109,700 | -8.21% | |
| 2011-01-04 | Cogent Communications Holdings, Inc. CCOI | director | 5,280 0.012% | $14.20 | $74,976 | +5.5% | ||
| 2010-01-04 | Cogent Communications Holdings, Inc. CCOI | director | 7,500 0.017% | $9.99 | $74,896 | +1.91% | ||
| 2009-01-02 | Cogent Communications Holdings, Inc. CCOI | director | 11,540 0.0263% | $6.47 | $74,652 | +26.62% | ||
| 2003-11-06 | Viavi Solutions Inc. VIAV | director | 11,363 – | $0 | $0 | -3.41% |