Who owns Oscar Health (OSCR)
Which tracked institutional funds hold OSCR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OSCR 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
54 tracked funds added or opened OSCR while 110 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
OSCR’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 OSCR more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in OSCR 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 331 tracked filers holding OSCR, 181 increased or opened the position and 173 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 OSCR 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 24
- VANGUARD CAPITAL MANAGEMENT LLC$124M
- VANGUARD PORTFOLIO MANAGEMENT LLC$121M
- VANGUARD FIDUCIARY TRUST CO$17M
- JUPITER ASSET MANAGEMENT LTD$15M
- Defiance ETFs, LLC$9M
- Empowered Funds, LLC$6M
Full exits 23
- VANGUARD GROUP INC$297M
- TWO SIGMA ADVISERS, LP$36M
- Squarepoint Ops LLC$7M
- Skandinaviska Enskilda Banken AB (publ)$4M
- RENAISSANCE TECHNOLOGIES LLC$4M
- Simplify Asset Management Inc.$3M
Largest adds
- T. Rowe Price Investment Management, Inc.$92M
- BANK OF AMERICA CORP /DE/$19M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$15M
- JACOBS LEVY EQUITY MANAGEMENT, INC$13M
- BNP PARIBAS FINANCIAL MARKETS$12M
- Freestone Grove Partners LP$11M
Largest trims
- MORGAN STANLEY$59M
- JANE STREET GROUP, LLC$50M
- BlackRock, Inc.$49M
- TWO SIGMA INVESTMENTS, LP$33M
- D. E. Shaw & Co., Inc.$25M
- Thrive Capital Management, LLC$18M
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. added | 20,587,428 | $587M | 13.9% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 12,643,617 | $361M | 8.6% | 2026-Q2 |
| STATE STREET CORP added | 5,801,351 | $165M | 3.9% | 2026-Q2 |
| FMR LLC added | 4,998,523 | $143M | 3.4% | 2026-Q2 |
| T. Rowe Price Investment Management, Inc. added | 11,644,496 | $134M | 3.2% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 10,777,627 | $124M | 2.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 10,545,848 | $121M | 2.9% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 4,229,552 | $121M | 2.9% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 4,035,689 | $115M | 2.7% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 3,284,500 | $94M | 2.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 3,255,724 | $93M | 2.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 7,029,356 | $81M | 1.9% | 2026-Q1 |
| Thrive Capital Management, LLC | 6,343,617 | $73M | 1.7% | 2026-Q1 |
| BIT Capital GmbH added | 6,321,421 | $73M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 5,032,255 | $58M | 1.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 4,192,777 | $48M | 1.1% | 2026-Q1 |
| MORGAN STANLEY trimmed | 3,354,981 | $38M | 0.9% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 2,904,105 | $33M | 0.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 2,860,310 | $33M | 0.8% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 2,745,804 | $31M | 0.7% | 2026-Q1 |
| GLYNN CAPITAL MANAGEMENT LLC trimmed | 2,591,792 | $30M | 0.7% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL trimmed | 1,018,792 | $29M | 0.7% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 2,474,423 | $28M | 0.7% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,993,630 | $23M | 0.5% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 799,762 | $23M | 0.5% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,898,745 | $22M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,877,284 | $22M | 0.5% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 708,669 | $20M | 0.5% | 2026-Q2 |
| Freestone Grove Partners LP added | 1,602,569 | $18M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 641,378 | $18M | 0.4% | 2026-Q2 |
| UBS Group AG added | 1,574,978 | $18M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,524,184 | $17M | 0.4% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 603,675 | $17M | 0.4% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 598,147 | $17M | 0.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 1,471,754 | $17M | 0.4% | 2026-Q1 |
| STATE OF MICHIGAN RETIREMENT SYSTEM | 1,450,000 | $17M | 0.4% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 558,954 | $16M | 0.4% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD added | 1,333,869 | $15M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 1,324,301 | $15M | 0.4% | 2026-Q1 |
| GROUP ONE TRADING LLC added | 1,257,777 | $14M | 0.3% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 1,227,803 | $14M | 0.3% | 2026-Q1 |
| Invesco Ltd. added | 472,382 | $13M | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,196,634 | $13M | 0.3% | 2026-Q1 |
| GILDER GAGNON HOWE & CO LLC trimmed | 1,074,592 | $12M | 0.3% | 2026-Q1 |
| Trexquant Investment LP added | 1,018,333 | $12M | 0.3% | 2026-Q1 |
| Fiduciary Alliance LLC added | 714,411 | $11M | 0.3% | 2026-Q1 |
| Walleye Trading LLC trimmed | 957,390 | $11M | 0.3% | 2026-Q1 |
| IMC-Chicago, LLC added | 850,444 | $10M | 0.2% | 2026-Q1 |
| SG Americas Securities, LLC trimmed | 800,984 | $9M | 0.2% | 2026-Q1 |
| RPG Investment Advisory, LLC added | 799,695 | $9M | 0.2% | 2026-Q1 |
| Defiance ETFs, LLC new | 769,214 | $9M | 0.2% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 754,700 | $9M | 0.2% | 2026-Q1 |
| Engineers Gate Manager LP added | 739,769 | $8M | 0.2% | 2026-Q1 |
| Rhenman & Partners Asset Management AB added | 660,000 | $8M | 0.2% | 2026-Q1 |
| SIMPLEX TRADING, LLC trimmed | 565,246 | $6M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 556,059 | $6M | 0.2% | 2026-Q1 |
| Empowered Funds, LLC added | 543,548 | $6M | 0.1% | 2026-Q1 |
| Bridgewater Associates, LP new | 213,704 | $6M | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 526,699 | $6M | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 525,626 | $6M | 0.1% | 2026-Q1 |
| SEB Asset Management AB new | 503,534 | $6M | 0.1% | 2026-Q1 |
| NORGES BANK added | 201,311 | $6M | 0.1% | 2026-Q2 |
| Sessa Capital IM, L.P. | 500,000 | $6M | 0.1% | 2026-Q1 |
| PFM Health Sciences, LP | 499,837 | $6M | 0.1% | 2026-Q1 |
| Alphabet Inc. | 481,988 | $6M | 0.1% | 2026-Q1 |
| RBF Capital, LLC | 449,604 | $5M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 358,266 | $5M | 0.1% | 2026-Q1 |
| CREDIT AGRICOLE S A trimmed | 445,969 | $5M | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 427,506 | $5M | 0.1% | 2026-Q1 |
| TORONTO DOMINION BANK added | 419,071 | $5M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 412,706 | $5M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 406,391 | $5M | 0.1% | 2026-Q1 |
| Halter Ferguson Financial Inc. added | 405,732 | $5M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 400,149 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 20,701,250 | $297M | 7.1% | 2025-Q4 stale |
| DEERFIELD MANAGEMENT COMPANY, L.P. trimmed | 11,649,591 | $250M | 5.9% | 2025-Q2 stale |
| Capital World Investors | 3,622,586 | $69M | 1.6% | 2025-Q3 stale |
| HENNESSY ADVISORS INC trimmed | 2,871,700 | $62M | 1.5% | 2025-Q2 stale |
| General Catalyst Group Management, LLC | 2,107,719 | $45M | 1.1% | 2025-Q2 stale |
| Ancient Art, L.P. | 2,950,753 | $39M | 0.9% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP added | 2,472,800 | $36M | 0.8% | 2025-Q4 stale |
| Capital International Investors added | 2,423,035 | $32M | 0.8% | 2025-Q1 stale |
| Clearbridge Investments, LLC trimmed | 1,449,224 | $31M | 0.7% | 2025-Q2 stale |
| Bienville Capital Management, LLC new | 989,013 | $21M | 0.5% | 2025-Q2 stale |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ trimmed | 881,857 | $19M | 0.4% | 2025-Q2 stale |
| BAILLIE GIFFORD & CO | 822,088 | $18M | 0.4% | 2025-Q2 stale |
| Park West Asset Management LLC added | 1,263,973 | $17M | 0.4% | 2025-Q1 stale |
| Rock Springs Capital Management LP trimmed | 700,000 | $15M | 0.4% | 2025-Q2 stale |
| OBERWEIS ASSET MANAGEMENT INC/ added | 578,430 | $12M | 0.3% | 2025-Q2 stale |
| PDT Partners, LLC added | 424,569 | $9M | 0.2% | 2025-Q2 stale |
| Annandale Capital, LLC | 45,000 | $9M | 0.2% | 2025-Q3 stale |
| GLENVIEW CAPITAL MANAGEMENT, LLC trimmed | 408,221 | $8M | 0.2% | 2025-Q3 stale |
| Aspen Grove Capital, LLC | 577,027 | $8M | 0.2% | 2025-Q1 stale |
| ARDSLEY ADVISORY PARTNERS LP added | 375,000 | $7M | 0.2% | 2025-Q3 stale |
| Squarepoint Ops LLC added | 483,043 | $7M | 0.2% | 2025-Q4 stale |
| First Light Asset Management, LLC trimmed | 522,302 | $7M | 0.2% | 2025-Q1 stale |
| Q Fund Management (Hong Kong) Ltd new | 313,800 | $6M | 0.1% | 2025-Q3 stale |
| Y-Intercept (Hong Kong) Ltd added | 253,956 | $5M | 0.1% | 2025-Q3 stale |
| BRIDGER MANAGEMENT, LLC trimmed | 248,280 | $5M | 0.1% | 2025-Q3 stale |
| MAVERICK CAPITAL LTD new | 213,095 | $5M | 0.1% | 2025-Q2 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.