Who owns Cogent Communications Holdings (CCOI)
Which tracked institutional funds hold CCOI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CCOI company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on CCOI is one-sided between 2026-Q1 and 2026-Q2: 19 added or opened and 72 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CCOI’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes CCOI more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in CCOI divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 210 tracked filers holding CCOI, 117 increased or opened the position and 129 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CCOI between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 8
- AYAL Capital Advisors Ltd$6M
- Jump Financial, LLC$3M
- MYDA Advisors LLC$3M
- Y-Intercept (Hong Kong) Ltd$2M
- ALGERT GLOBAL LLC$2M
- Schonfeld Strategic Advisors LLC$1M
Full exits 17
- DigitalBridge Group, Inc.$22M
- Oakum Bay Capital LLC$13M
- HRT FINANCIAL LP$10M
- 683 Capital Management, LLC$8M
- BLUEFIN CAPITAL MANAGEMENT, LLC$2M
- Man Group plc$2M
Largest adds
- CITADEL ADVISORS LLC$8M
- Park West Asset Management LLC$7M
- AQR CAPITAL MANAGEMENT LLC$5M
- BNP PARIBAS FINANCIAL MARKETS$3M
- XTX Topco Ltd$3M
- Squarepoint Ops LLC$2M
Largest trims
- TURTLE CREEK ASSET MANAGEMENT INC.$97M
- BlackRock, Inc.$31M
- MORGAN STANLEY$27M
- VANGUARD PORTFOLIO MANAGEMENT LLC$19M
- Harspring Capital Management, LLC$12M
- VANGUARD CAPITAL MANAGEMENT LLC$12M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 7,376,384 | $102M | 16.1% | 2026-Q2 |
| TURTLE CREEK ASSET MANAGEMENT INC. trimmed | 4,203,527 | $58M | 9.2% | 2026-Q2 |
| Park West Asset Management LLC added | 3,106,339 | $43M | 6.8% | 2026-Q2 |
| STATE STREET CORP added | 2,779,367 | $39M | 6.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 2,384,929 | $33M | 5.2% | 2026-Q2 |
| EdgePoint Investment Group Inc. | 2,283,378 | $32M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 2,037,716 | $28M | 4.4% | 2026-Q2 |
| Newtyn Management, LLC added | 1,655,895 | $23M | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,245,445 | $17M | 2.7% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,172,541 | $16M | 2.6% | 2026-Q2 |
| MAGNOLIA GROUP, LLC trimmed | 979,686 | $14M | 2.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 973,138 | $14M | 2.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 805,244 | $11M | 1.8% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC added | 783,783 | $11M | 1.7% | 2026-Q2 |
| Broad Run Investment Management, LLC trimmed | 660,130 | $9M | 1.4% | 2026-Q2 |
| MORGAN STANLEY trimmed | 627,593 | $9M | 1.4% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 615,561 | $9M | 1.3% | 2026-Q2 |
| Harspring Capital Management, LLC trimmed | 599,418 | $8M | 1.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 516,683 | $7M | 1.1% | 2026-Q2 |
| UBS Group AG added | 512,618 | $7M | 1.1% | 2026-Q2 |
| CenterBook Partners LP added | 503,457 | $7M | 1.1% | 2026-Q2 |
| AYAL Capital Advisors Ltd added | 400,000 | $6M | 0.9% | 2026-Q2 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 382,608 | $5M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 344,108 | $5M | 0.8% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 328,127 | $5M | 0.7% | 2026-Q2 |
| Granahan Investment Management, LLC trimmed | 302,653 | $4M | 0.7% | 2026-Q2 |
| PDT Partners, LLC added | 296,439 | $4M | 0.6% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 284,694 | $4M | 0.6% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 280,790 | $4M | 0.6% | 2026-Q2 |
| Invesco Ltd. added | 268,923 | $4M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 267,486 | $4M | 0.6% | 2026-Q2 |
| FourWorld Capital Management LLC | 265,500 | $4M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 265,490 | $4M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 254,861 | $4M | 0.6% | 2026-Q2 |
| Jump Financial, LLC added | 251,745 | $3M | 0.5% | 2026-Q2 |
| BlackBarn Capital Partners LP trimmed | 250,000 | $3M | 0.5% | 2026-Q2 |
| HERALD INVESTMENT MANAGEMENT Ltd | 242,600 | $3M | 0.5% | 2026-Q2 |
| MYDA Advisors LLC added | 240,000 | $3M | 0.5% | 2026-Q2 |
| Palliser Capital (UK) Ltd trimmed | 236,393 | $3M | 0.5% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 233,633 | $3M | 0.5% | 2026-Q2 |
| Squarepoint Ops LLC added | 226,035 | $3M | 0.5% | 2026-Q2 |
| XTX Topco Ltd added | 220,290 | $3M | 0.5% | 2026-Q2 |
| Nuveen, LLC added | 169,874 | $2M | 0.4% | 2026-Q2 |
| FMR LLC trimmed | 165,173 | $2M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 164,109 | $2M | 0.4% | 2026-Q2 |
| Global Endowment Management, LP added | 158,582 | $2M | 0.3% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 154,019 | $2M | 0.3% | 2026-Q2 |
| CAXTON ASSOCIATES LLP added | 145,106 | $2M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 143,160 | $2M | 0.3% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 139,269 | $2M | 0.3% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL trimmed | 134,381 | $2M | 0.3% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 132,470 | $2M | 0.3% | 2026-Q2 |
| LPL Financial LLC added | 122,316 | $2M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 119,138 | $2M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 118,915 | $2M | 0.3% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 118,403 | $2M | 0.3% | 2026-Q2 |
| Advisors Asset Management, Inc. trimmed | 114,375 | $2M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 102,920 | $1M | 0.2% | 2026-Q2 |
| Skylands Capital, LLC added | 98,425 | $1M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 98,000 | $1M | 0.2% | 2026-Q2 |
| WINTON GROUP Ltd added | 89,009 | $1M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 86,639 | $1M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 77,824 | $1M | 0.2% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 75,678 | $1M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 73,289 | $1M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 69,899 | $970K | 0.2% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 69,619 | $966K | 0.2% | 2026-Q2 |
| BROWN ADVISORY INC added | 57,476 | $798K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 56,728 | $787K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 54,179 | $752K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 53,544 | $743K | 0.1% | 2026-Q2 |
| IMC-Chicago, LLC added | 50,535 | $701K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. | 50,321 | $948K | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 50,175 | $696K | 0.1% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 49,231 | $683K | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 46,394 | $644K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 45,220 | $628K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 41,960 | $582K | 0.1% | 2026-Q2 |
| OPPENHEIMER & CO INC added | 41,501 | $576K | 0.1% | 2026-Q2 |
| New Age Alpha Advisors, LLC added | 37,712 | $523K | 0.1% | 2026-Q2 |
| Numerai GP LLC new | 36,370 | $505K | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 34,982 | $486K | 0.1% | 2026-Q2 |
| Salvus Wealth Management, LLC trimmed | 34,826 | $483K | 0.1% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP new | 33,639 | $467K | 0.1% | 2026-Q2 |
| PNC Financial Services Group, Inc. added | 32,422 | $450K | 0.1% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 31,841 | $442K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 30,615 | $425K | 0.1% | 2026-Q2 |
| Creative Planning added | 29,616 | $411K | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 28,773 | $399K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 28,551 | $396K | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 28,294 | $393K | 0.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 26,582 | $369K | 0.1% | 2026-Q2 |
| PRAIRIEVIEW WEALTH PARTNERS, LLC trimmed | 25,742 | $357K | 0.1% | 2026-Q2 |
| SHRIER WEALTH MANAGEMENT, LLC added | 23,453 | $326K | 0.1% | 2026-Q2 |
| Texas Yale Capital Corp. | 23,000 | $319K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 22,712 | $315K | 0.0% | 2026-Q2 |
| MIRABELLA FINANCIAL SERVICES LLP new | 22,156 | $308K | 0.0% | 2026-Q2 |
| Jupiter Topco LLC new | 21,111 | $293K | 0.0% | 2026-Q2 |
| Louisiana State Employees Retirement System | 21,000 | $396K | 0.1% | 2026-Q2 |
| FIRST CITIZENS BANK & TRUST CO added | 20,855 | $289K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.