Who owns Organon & Co. (OGN)
Which tracked institutional funds hold OGN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OGN company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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
40 tracked funds added or opened OGN while 81 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
OGN’s largest tracked holder by dollar value, VANGUARD GROUP 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 OGN more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in OGN 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 2025-Q4 and 2026-Q1, across 606 tracked filers holding OGN, 217 increased or opened the position and 310 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 OGN between the 2025-Q4 and 2026-Q1 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 19
- VANGUARD PORTFOLIO MANAGEMENT LLC$131M
- VANGUARD CAPITAL MANAGEMENT LLC$70M
- Think Investments LP$24M
- VANGUARD FIDUCIARY TRUST CO$10M
- HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC$8M
- Trexquant Investment LP$2M
Full exits 16
- VANGUARD GROUP INC$249M
- JANE STREET GROUP, LLC$14M
- TWO SIGMA ADVISERS, LP$12M
- BEDDOW CAPITAL MANAGEMENT INC$5M
- NATIXIS$4M
- READYSTATE ASSET MANAGEMENT LP$4M
Largest adds
- EverSource Wealth Advisors, LLC$42M
- MILLENNIUM MANAGEMENT LLC$37M
- FMR LLC$15M
- CANADA PENSION PLAN INVESTMENT BOARD$13M
- NORGES BANK$12M
- KAHN BROTHERS GROUP INC$7M
Largest trims
- BlackRock, Inc.$89M
- AQR CAPITAL MANAGEMENT LLC$41M
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$39M
- Sio Capital Management, LLC$19M
- Gotham Asset Management, LLC$11M
- LSV ASSET MANAGEMENT$10M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 22,220,787 | $133M | 7.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 21,846,036 | $131M | 7.8% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 11,737,018 | $70M | 4.2% | 2026-Q1 |
| STATE STREET CORP added | 9,956,774 | $60M | 3.5% | 2026-Q1 |
| LSV ASSET MANAGEMENT trimmed | 7,259,730 | $43M | 2.6% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 126,291 | $42M | 2.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 6,781,535 | $41M | 2.4% | 2026-Q1 |
| KAHN BROTHERS GROUP INC added | 5,536,993 | $33M | 2.0% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 5,011,100 | $30M | 1.8% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,759,337 | $29M | 1.7% | 2026-Q1 |
| PRIVATE MANAGEMENT GROUP INC added | 4,374,108 | $26M | 1.6% | 2026-Q1 |
| Think Investments LP new | 4,000,000 | $24M | 1.4% | 2026-Q1 |
| UBS Group AG trimmed | 3,471,579 | $21M | 1.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 3,362,349 | $20M | 1.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 3,439,724 | $20M | 1.2% | 2026-Q1 |
| MORGAN STANLEY added | 3,292,684 | $20M | 1.2% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 3,265,280 | $20M | 1.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 3,227,320 | $19M | 1.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 3,137,020 | $19M | 1.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 2,630,020 | $16M | 0.9% | 2026-Q1 |
| FMR LLC added | 2,542,368 | $15M | 0.9% | 2026-Q1 |
| NORGES BANK added | 963,733 | $14M | 0.9% | 2026-Q1 |
| Cerity Partners LLC added | 2,309,039 | $14M | 0.8% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 2,231,761 | $13M | 0.8% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,998,390 | $12M | 0.7% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,970,434 | $12M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,914,114 | $11M | 0.7% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 1,689,210 | $10M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,612,057 | $10M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 1,605,325 | $10M | 0.6% | 2026-Q1 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC new | 1,375,960 | $8M | 0.5% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 1,260,689 | $8M | 0.4% | 2026-Q1 |
| Gotham Asset Management, LLC trimmed | 1,257,055 | $8M | 0.4% | 2026-Q1 |
| Mitsubishi UFJ Trust & Banking Corp trimmed | 1,086,369 | $7M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 1,082,760 | $6M | 0.4% | 2026-Q1 |
| Allianz Asset Management GmbH trimmed | 1,082,748 | $6M | 0.4% | 2026-Q1 |
| M&G PLC added | 1,003,250 | $6M | 0.4% | 2026-Q1 |
| FIRST MANHATTAN CO. LLC. added | 950,172 | $6M | 0.3% | 2026-Q1 |
| MARSHALL WACE, LLP added | 933,176 | $6M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 930,094 | $6M | 0.3% | 2026-Q1 |
| Sio Capital Management, LLC trimmed | 865,908 | $5M | 0.3% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 720,512 | $5M | 0.3% | 2026-Q1 |
| Squarepoint Ops LLC added | 831,424 | $5M | 0.3% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 778,905 | $5M | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 754,240 | $5M | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 738,502 | $4M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 700,599 | $4M | 0.2% | 2026-Q1 |
| BRANDES INVESTMENT PARTNERS, LP added | 691,625 | $4M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 678,043 | $4M | 0.2% | 2026-Q1 |
| CITIGROUP INC added | 596,772 | $4M | 0.2% | 2026-Q1 |
| Bridgewater Associates, LP trimmed | 594,483 | $4M | 0.2% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 523,472 | $3M | 0.2% | 2026-Q1 |
| Douglas Lane & Associates, LLC added | 522,642 | $3M | 0.2% | 2026-Q1 |
| Swiss National Bank | 512,575 | $3M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 491,421 | $3M | 0.2% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 485,509 | $3M | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 477,736 | $3M | 0.2% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 476,488 | $3M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 468,931 | $3M | 0.2% | 2026-Q1 |
| Grantham, Mayo, Van Otterloo & Co. LLC added | 448,874 | $3M | 0.2% | 2026-Q1 |
| Trexquant Investment LP trimmed | 402,790 | $2M | 0.1% | 2026-Q1 |
| CM Management, LLC added | 400,000 | $2M | 0.1% | 2026-Q1 |
| Walleye Capital LLC trimmed | 393,125 | $2M | 0.1% | 2026-Q1 |
| Lombard Odier Asset Management (USA) Corp new | 380,000 | $2M | 0.1% | 2026-Q1 |
| VestGen Advisors, LLC new | 170,619 | $2M | 0.1% | 2026-Q1 |
| SECTOR GAMMA AS added | 375,974 | $2M | 0.1% | 2026-Q1 |
| CIBC Bancorp USA Inc. new | 340,721 | $2M | 0.1% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 336,976 | $2M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 327,935 | $2M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 327,075 | $2M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 34,773,284 | $249M | 14.8% | 2025-Q4 stale |
| SOUND SHORE MANAGEMENT INC /CT/ added | 4,977,078 | $74M | 4.4% | 2025-Q1 stale |
| DEPRINCE RACE & ZOLLO INC trimmed | 4,651,087 | $69M | 4.1% | 2025-Q1 stale |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 3,086,456 | $32M | 1.9% | 2025-Q3 stale |
| Brandywine Global Investment Management, LLC trimmed | 2,214,334 | $24M | 1.4% | 2025-Q3 stale |
| New Vernon Capital Holdings II LLC added | 243,734 | $16M | 1.0% | 2025-Q1 stale |
| JANE STREET GROUP, LLC added | 2,007,556 | $14M | 0.9% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 1,736,800 | $12M | 0.7% | 2025-Q4 stale |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 901,942 | $9M | 0.5% | 2025-Q2 stale |
| ALPS ADVISORS INC trimmed | 892,200 | $9M | 0.5% | 2025-Q2 stale |
| EASTERLY INVESTMENT PARTNERS LLC added | 486,623 | $7M | 0.4% | 2025-Q1 stale |
| Avidity Partners Management LP added | 640,000 | $6M | 0.4% | 2025-Q2 stale |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 535,830 | $6M | 0.3% | 2025-Q3 stale |
| Susquehanna Portfolio Strategies, LLC added | 486,310 | $5M | 0.3% | 2025-Q3 stale |
| BEDDOW CAPITAL MANAGEMENT INC added | 666,725 | $5M | 0.3% | 2025-Q4 stale |
| Foundry Partners, LLC trimmed | 302,319 | $5M | 0.3% | 2025-Q1 stale |
| California Public Employees Retirement System added | 449,251 | $4M | 0.3% | 2025-Q2 stale |
| NATIXIS added | 546,593 | $4M | 0.2% | 2025-Q4 stale |
| AGF MANAGEMENT LTD added | 360,165 | $4M | 0.2% | 2025-Q3 stale |
| AXA Investment Managers S.A. new | 351,704 | $4M | 0.2% | 2025-Q3 stale |
| READYSTATE ASSET MANAGEMENT LP trimmed | 514,810 | $4M | 0.2% | 2025-Q4 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 498,631 | $4M | 0.2% | 2025-Q4 stale |
| NIA IMPACT ADVISORS, LLC added | 224,475 | $3M | 0.2% | 2025-Q1 stale |
| ADVENT CAPITAL MANAGEMENT /DE/ | 200,000 | $3M | 0.2% | 2025-Q1 stale |
| CAPITAL FUND MANAGEMENT S.A. added | 383,200 | $3M | 0.2% | 2025-Q4 stale |
| Optimist Retirement Group LLC trimmed | 249,222 | $3M | 0.2% | 2025-Q3 stale |
| CSM Advisors, LLC new | 241,903 | $2M | 0.1% | 2025-Q2 stale |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main added | 197,972 | $2M | 0.1% | 2025-Q3 stale |
| AXA S.A. trimmed | 216,869 | $2M | 0.1% | 2025-Q2 stale |
| Alaska Permanent Fund Corp | 150,538 | $2M | 0.1% | 2025-Q1 stale |
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.