SCHAEFFER DAVE (CIK 1166976) reported 47 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-04-02). Recent activity: Sell CCOI (58,667 shares), Sell CCOI (29,333 shares), Buy CCOI (29,333 shares), Buy CCOI (229,657 shares), Sell CCOI (229,657 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-02 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 58,667 | $0 |
| 2026-04-02 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 29,333 | $0 |
| 2026-04-02 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Buy | 29,333 | $0 |
| 2026-01-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Buy | 229,657 | $0 |
| 2026-01-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 229,657 | $0 |
| 2026-01-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Buy | 229,657 | $0 |
| 2025-08-11 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 818,909 | $22.5M |
| 2025-08-08 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 1.8M | $60.0M |
| 2025-06-16 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 45,000 | $2.1M |
| 2025-06-16 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 10,000 | $473,400 |
| 2025-06-16 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 45,000 | $2.1M |
| 2025-06-16 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 25,000 | $1.2M |
| 2025-06-12 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 45,000 | $2.2M |
| 2025-06-12 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 10,000 | $478,300 |
| 2025-06-12 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 45,000 | $2.2M |
| 2025-06-12 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 10,000 | $483,500 |
| 2025-06-10 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 40,000 | $1.9M |
| 2025-06-10 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 15,000 | $729,450 |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 50,000 | $2.4M |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 30,000 | $1.4M |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 40,000 | $1.9M |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 35,000 | $1.7M |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 40,000 | $1.9M |
| 2025-06-09 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 15,000 | $734,850 |
| 2025-06-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | CHAIRMAN, CEO, AND PRESIDENT | Sell | 50,000 | $2.4M |
Source: SEC Form 4 filings · as of 2026-04-02