Chang John B. (CIK 1775672) reported 7 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-01-05). Recent activity: Buy CCOI (9,600 shares), Buy CCOI (100,000 shares), Buy CCOI (2,400 shares), Sell CCOI (398 shares), Sell CCOI (756 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Buy | 9,600 | $0 |
| 2026-01-05 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Buy | 100,000 | $0 |
| 2025-12-02 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Buy | 2,400 | $0 |
| 2025-06-03 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Sell | 398 | $0 |
| 2025-05-15 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Sell | 756 | $0 |
| 2025-05-15 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Buy | 504 | $0 |
| 2025-04-11 | COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) | VP & CHIEF LEGAL OFFICER | Sell | 357 | $0 |
来源：SEC Form 4 申报文件 · 截至 2026-01-05