Who owns Outset Medical (OM)
Which tracked institutional funds hold OM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OM 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
11 tracked funds added or opened OM while 10 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
OM’s largest tracked holder by dollar value, Durable Capital Partners LP, sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in OM 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 88 tracked filers holding OM, 51 increased or opened the position and 55 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 OM 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 3
- Peapod Lane Capital LLC$1M
- MARSHALL WACE, LLP$916K
- MILLENNIUM MANAGEMENT LLC$785K
Full exits 1
- Woodline Partners LP$1M
Largest adds
- BML Capital Management, LLC$4M
- FMR LLC$2M
- AQR CAPITAL MANAGEMENT LLC$1M
- VANGUARD CAPITAL MANAGEMENT LLC$437K
- PERCEPTIVE ADVISORS LLC$400K
- GOLDMAN SACHS GROUP INC$391K
Largest trims
- BlackRock, Inc.$3M
- EverSource Wealth Advisors, LLC$1M
- STATE STREET CORP$936K
- BANK OF AMERICA CORP /DE/$769K
- GEODE CAPITAL MANAGEMENT, LLC$734K
- RENAISSANCE TECHNOLOGIES LLC$665K
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 |
|---|---|---|---|---|
| FMR LLC added | 2,742,887 | $12M | 11.0% | 2026-Q2 |
| BML Capital Management, LLC added | 2,519,701 | $11M | 10.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 998,961 | $4M | 4.0% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC | 833,333 | $4M | 3.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 780,134 | $3M | 3.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 665,847 | $3M | 2.7% | 2026-Q2 |
| PFM Health Sciences, LP trimmed | 582,122 | $3M | 2.3% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 434,341 | $2M | 1.7% | 2026-Q2 |
| BlackRock, Inc. trimmed | 418,211 | $2M | 1.7% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 339,438 | $1M | 1.4% | 2026-Q2 |
| Peapod Lane Capital LLC new | 331,951 | $1M | 1.3% | 2026-Q2 |
| MARSHALL WACE, LLP added | 211,993 | $916K | 0.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 204,652 | $885K | 0.8% | 2026-Q2 |
| Stratos Wealth Partners, LTD. | 200,546 | $866K | 0.8% | 2026-Q2 |
| UBS Group AG trimmed | 190,289 | $822K | 0.8% | 2026-Q2 |
| MORGAN STANLEY added | 181,983 | $786K | 0.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 181,794 | $785K | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 173,460 | $749K | 0.7% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 139,197 | $601K | 0.6% | 2026-Q2 |
| XTX Topco Ltd trimmed | 124,690 | $539K | 0.5% | 2026-Q2 |
| Catalio Capital Management, LP | 118,279 | $511K | 0.5% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 114,912 | $496K | 0.5% | 2026-Q2 |
| GMT Capital Corp added | 98,108 | $424K | 0.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 90,698 | $392K | 0.4% | 2026-Q2 |
| PURA VIDA INVESTMENTS, LLC | 83,333 | $360K | 0.3% | 2026-Q2 |
| STATE STREET CORP trimmed | 81,206 | $351K | 0.3% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 81,023 | $350K | 0.3% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 52,127 | $225K | 0.2% | 2026-Q2 |
| Marquette Asset Management, LLC new | 48,981 | $212K | 0.2% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ trimmed | 45,622 | $197K | 0.2% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 43,574 | $188K | 0.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 43,428 | $188K | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 42,771 | $185K | 0.2% | 2026-Q2 |
| Centiva Capital, LP trimmed | 39,785 | $172K | 0.2% | 2026-Q2 |
| Clayton Partners LLC new | 37,527 | $162K | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 35,622 | $154K | 0.1% | 2026-Q2 |
| Jain Global LLC added | 33,095 | $143K | 0.1% | 2026-Q2 |
| Mariner, LLC added | 32,413 | $140K | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 28,619 | $124K | 0.1% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 27,899 | $121K | 0.1% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC | 26,943 | $116K | 0.1% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 25,000 | $108K | 0.1% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ added | 24,678 | $107K | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 22,702 | $98K | 0.1% | 2026-Q2 |
| Catalyst Funds Management Pty Ltd added | 19,201 | $83K | 0.1% | 2026-Q2 |
| Cerity Partners LLC added | 19,009 | $82K | 0.1% | 2026-Q2 |
| R Squared Ltd trimmed | 16,998 | $73K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 16,937 | $73K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 16,465 | $71K | 0.1% | 2026-Q2 |
| Arax Advisory Partners added | 15,582 | $67K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC new | 13,041 | $58K | 0.1% | 2026-Q2 |
| Creative Planning new | 11,795 | $51K | 0.0% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 11,179 | $48K | 0.0% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 8,327 | $36K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 7,902 | $34K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) trimmed | 4,668 | $20K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 4,320 | $19K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 2,583 | $11K | 0.0% | 2026-Q2 |
| HUNTINGTON NATIONAL BANK | 1,637 | $7K | 0.0% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 1,493 | $6K | 0.0% | 2026-Q2 |
| PNC Financial Services Group, Inc. added | 1,411 | $6K | 0.0% | 2026-Q2 |
| EverSource Wealth Advisors, LLC trimmed | 1,394 | $6K | 0.0% | 2026-Q2 |
| Allworth Financial LP added | 1,120 | $5K | 0.0% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 650 | $3K | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 588 | $2K | 0.0% | 2026-Q2 |
| Essential Partners LLC trimmed | 404 | $2K | 0.0% | 2026-Q2 |
| GAMMA Investing LLC trimmed | 336 | $1K | 0.0% | 2026-Q2 |
| MassMutual Private Wealth & Trust, FSB | 259 | $1K | 0.0% | 2026-Q2 |
| ROTHSCHILD INVESTMENT LLC added | 239 | $1K | 0.0% | 2026-Q2 |
| Farther Finance Advisors, LLC added | 179 | $774 | 0.0% | 2026-Q2 |
| Fortitude Family Office, LLC added | 176 | $760 | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 137 | $591 | 0.0% | 2026-Q2 |
| Bogart Wealth, LLC new | 130 | $562 | 0.0% | 2026-Q2 |
| NISA INVESTMENT ADVISORS, LLC trimmed | 115 | $497 | 0.0% | 2026-Q2 |
| IFP Advisors, Inc added | 98 | $423 | 0.0% | 2026-Q2 |
| Basecamp Wealth Advisors LLC added | 74 | $320 | 0.0% | 2026-Q2 |
| SJS Investment Consulting Inc. added | 61 | $264 | 0.0% | 2026-Q2 |
| True Wealth Design, LLC added | 56 | $242 | 0.0% | 2026-Q2 |
| Clearstead Advisors, LLC trimmed | 47 | $204 | 0.0% | 2026-Q2 |
| Wealth Enhancement Trust Services, Inc. new | 43 | $186 | 0.0% | 2026-Q2 |
| Fourth Dimension Wealth, LLC | 31 | $134 | 0.0% | 2026-Q2 |
| Transamerica Financial Advisors, LLC added | 25 | $108 | 0.0% | 2026-Q2 |
| ADIRONDACK TRUST CO | 18 | $77 | 0.0% | 2026-Q2 |
| Ancora Advisors LLC new | 8 | $35 | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd trimmed | 7 | $30 | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. trimmed | 5 | $22 | 0.0% | 2026-Q2 |
| JPL Wealth Management, LLC added | 5 | $22 | 0.0% | 2026-Q2 |
| US BANCORP \DE\ | 2 | $9 | 0.0% | 2026-Q2 |
| Woodline Partners LP trimmed | 292,437 | $1M | 1.0% | 2026-Q1 stale (1 quarter behind) |
| Alyeska Investment Group, L.P. | 1,614,582 | $6M | 5.5% | 2025-Q4 stale (2 quarters behind) |
| VANGUARD GROUP INC trimmed | 977,969 | $4M | 3.4% | 2025-Q4 stale (2 quarters behind) |
| Durable Capital Partners LP trimmed | 1,023,706 | $14M | 13.4% | 2025-Q3 stale (3 quarters behind) |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 631,663 | $9M | 8.3% | 2025-Q3 stale (3 quarters behind) |
| Parkman Healthcare Partners LLC trimmed | 454,512 | $6M | 5.9% | 2025-Q3 stale (3 quarters behind) |
| TWO SIGMA INVESTMENTS, LP added | 146,598 | $2M | 1.9% | 2025-Q3 stale (3 quarters behind) |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 116,291 | $2M | 1.5% | 2025-Q3 stale (3 quarters behind) |
| Schonfeld Strategic Advisors LLC trimmed | 114,800 | $2M | 1.5% | 2025-Q3 stale (3 quarters behind) |
| Susquehanna Portfolio Strategies, LLC added | 58,972 | $833K | 0.8% | 2025-Q3 stale (3 quarters behind) |
| Walleye Capital LLC new | 56,101 | $1M | 1.0% | 2025-Q2 stale (4 quarters behind) |
| TD Asset Management Inc trimmed | 53,266 | $1M | 0.9% | 2025-Q2 stale (4 quarters behind) |
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.