Cogent Communications Holdings, Inc. (CCOI) ownership: Top institutional holder: BlackRock Fund Advisors ($133.65M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock Fund Advisors | 3232056.00 | $133.65M | 2016-12-31 |
| BlackRock, Inc. | 7075372.00 | $133.30M | 2026-03-31 |
| VANGUARD GROUP INC | 5580271.00 | $120.31M | 2025-12-31 |
| TURTLE CREEK ASSET MANAGEMENT INC. | 4348897.00 | $81.93M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2748759.00 | $51.79M | 2026-03-31 |
| EdgePoint Investment Group Inc. | 2283378.00 | $43.02M | 2026-03-31 |
| STATE STREET CORP | 2273265.00 | $42.83M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2120531.00 | $39.95M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-05-28 | |
| Sell | null | 2026-05-28 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-04 | |
| Sell | null | 2026-05-04 | |
| Sell | null | 2026-05-04 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.