🕵️ Cogent Communications Holdings, Inc. ($CCOI)
SEC insider & ownership activity, last 12 months · CIK 1158324 · every row links its SEC filing
Over the last 12 months insiders sold $83.8M with no open-market buying against it. Schaeffer Dave sold $82.5M in discretionary trades (Aug). Blackrock, Inc. added 13.0% → 14.4%; Turtle Creek Asset Management Inc. trimmed 9.4% → 8.2%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 5 sellers, $83.8M (18 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Schaeffer Dave | 0 | – | 2 | $82.5M | Aug 8, 2025 |
| Thaddeus Weed | 0 | – | 4 | $548K | Jun 16, 2026 |
| Henry W. Kilmer | 0 | – | 5 | $281K | Jun 15, 2026 |
| Kennedy Sheryl Lynn | 0 | – | 4 | $253K | May 14, 2026 |
| Lewis H. Ferguson | 0 | – | 3 | $189K | May 28, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 14.4% | 13G | Jan 23, 2026 | filing ↗ | |
| Turtle Creek Asset Management Inc. | 8.2% | 13G | Feb 17, 2026 | filing ↗ | |
| Park West Asset Management LLC | 5.6% | 13G | Jun 17, 2026 | filing ↗ | |
| Peter S. Park | 5.6% | 13G | Jun 17, 2026 | filing ↗ | |
| Vanguard Portfolio Management | 5.6% | 13G | Apr 29, 2026 | filing ↗ | |
| Park West Investors Master Fund, Limited | 5.0% | 13G | Jun 17, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Thaddeus Weed | $81K | Jun 16, 2026 | filing ↗ |
| Henry W. Kilmer | $42K | Jun 9, 2026 | filing ↗ |
| Lewis H Ferguson | $57K | May 28, 2026 | filing ↗ |
| Sheryl Lynn Kennedy | $53K | May 14, 2026 | filing ↗ |
| Thaddeus Weed | $110K | Mar 5, 2026 | filing ↗ |
| Henry W. Kilmer | $55K | Mar 5, 2026 | filing ↗ |
| Sheryl Lynn Kennedy | $76K | Mar 5, 2026 | filing ↗ |
| Lewis H Ferguson | $51K | Mar 5, 2026 | filing ↗ |
| Thaddeus Weed | $175K | Dec 11, 2025 | filing ↗ |
| Henry W. Kilmer | $96K | Dec 3, 2025 | filing ↗ |
| Lewis H Ferguson | $78K | Dec 1, 2025 | filing ↗ |
| Sheryl Lynn Kennedy | $51K | Nov 11, 2025 | filing ↗ |
| Henry W. Kilmer | $88K | Sep 4, 2025 | filing ↗ |
| Thaddeus Weed | $181K | Sep 2, 2025 | filing ↗ |
| Sheryl Lynn Kennedy | $74K | Aug 21, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Reg FD disclosure (7.01) | Jun 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 29, 2026 | filing ↗ |
| Material agreement (1.01) | Jun 15, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 15, 2026 | filing ↗ |
| Material agreement (1.01) | May 22, 2026 | filing ↗ |
| Other events (8.01) | May 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 22, 2026 | filing ↗ |
| Earnings (2.02) | May 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 4, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 1, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 1, 2026 | filing ↗ |
| Earnings (2.02) | Feb 20, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 20, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 31, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 31, 2025 | filing ↗ |
| Earnings (2.02) | Nov 17, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 17, 2025 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Officer/director changes (5.02) | Aug 11, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 11, 2025 | filing ↗ |
| Earnings (2.02) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |