Who owns Outset Medical, Inc. (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-Q1 13F filings. 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
9 tracked funds added or opened OM while 7 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
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 2025-Q4 and 2026-Q1, across 98 tracked filers holding OM, 60 increased or opened the position and 48 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 OM 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 2
- VANGUARD CAPITAL MANAGEMENT LLC$3M
- Stratos Wealth Partners, LTD.$770K
Full exits 3
- Alyeska Investment Group, L.P.$6M
- VANGUARD GROUP INC$4M
- MARSHALL WACE, LLP$634K
Largest adds
- BML Capital Management, LLC$5M
- AQR CAPITAL MANAGEMENT LLC$2M
- EverSource Wealth Advisors, LLC$1M
- UBS Group AG$698K
- RENAISSANCE TECHNOLOGIES LLC$685K
- FMR LLC$347K
Largest trims
- Woodline Partners LP$4M
- DEUTSCHE BANK AG\$543K
- NORTHERN TRUST CORP$381K
- ACADIAN ASSET MANAGEMENT LLC$319K
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 | 2,641,673 | $10M | 9.0% | 2026-Q1 |
| BML Capital Management, LLC added | 1,902,201 | $7M | 6.5% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,263,219 | $5M | 4.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 949,397 | $4M | 3.2% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC | 833,333 | $3M | 2.8% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 790,804 | $3M | 2.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 763,822 | $3M | 2.6% | 2026-Q1 |
| PFM Health Sciences, LP added | 594,630 | $2M | 2.0% | 2026-Q1 |
| Ensign Peak Advisors, Inc trimmed | 526,585 | $2M | 1.8% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 504,093 | $2M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 421,373 | $2M | 1.4% | 2026-Q1 |
| STATE STREET CORP added | 334,994 | $1M | 1.1% | 2026-Q1 |
| Woodline Partners LP trimmed | 292,437 | $1M | 1.0% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 7,146 | $1M | 0.9% | 2026-Q1 |
| UBS Group AG added | 252,499 | $970K | 0.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 222,075 | $853K | 0.8% | 2026-Q1 |
| Stratos Wealth Partners, LTD. new | 200,546 | $770K | 0.7% | 2026-Q1 |
| MORGAN STANLEY added | 169,443 | $651K | 0.6% | 2026-Q1 |
| XTX Topco Ltd added | 142,450 | $547K | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 125,437 | $482K | 0.4% | 2026-Q1 |
| Catalio Capital Management, LP | 118,279 | $454K | 0.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 113,365 | $435K | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 111,639 | $429K | 0.4% | 2026-Q1 |
| Birchview Capital, LP trimmed | 98,882 | $380K | 0.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 98,610 | $379K | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 100,977 | $365K | 0.3% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 93,360 | $359K | 0.3% | 2026-Q1 |
| PURA VIDA INVESTMENTS, LLC added | 83,333 | $320K | 0.3% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ trimmed | 18,012 | $265K | 0.2% | 2026-Q1 |
| Engineers Gate Manager LP added | 66,869 | $257K | 0.2% | 2026-Q1 |
| C WorldWide Group Holding A/S | 66,666 | $256K | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 65,585 | $252K | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 64,810 | $249K | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 62,360 | $239K | 0.2% | 2026-Q1 |
| Centiva Capital, LP added | 50,719 | $195K | 0.2% | 2026-Q1 |
| NATIONAL BANK OF CANADA /FI/ added | 46,164 | $177K | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 42,941 | $165K | 0.1% | 2026-Q1 |
| GMT Capital Corp trimmed | 42,421 | $163K | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 41,162 | $158K | 0.1% | 2026-Q1 |
| IEQ CAPITAL, LLC new | 39,737 | $153K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 39,427 | $152K | 0.1% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 39,755 | $149K | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 35,366 | $136K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 30,383 | $117K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 27,880 | $107K | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC | 26,943 | $103K | 0.1% | 2026-Q1 |
| CWM, LLC added | 22,139 | $85K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 21,584 | $83K | 0.1% | 2026-Q1 |
| Mariner, LLC added | 18,470 | $71K | 0.1% | 2026-Q1 |
| R Squared Ltd added | 17,052 | $65K | 0.1% | 2026-Q1 |
| Cerity Partners LLC added | 12,737 | $49K | 0.0% | 2026-Q1 |
| BARCLAYS PLC trimmed | 10,792 | $41K | 0.0% | 2026-Q1 |
| IMC-Chicago, LLC new | 10,325 | $40K | 0.0% | 2026-Q1 |
| MERCER GLOBAL ADVISORS INC /ADV trimmed | 10,111 | $39K | 0.0% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 10,400 | $39K | 0.0% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 8,226 | $32K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 7,902 | $30K | 0.0% | 2026-Q1 |
| LOS ANGELES CAPITAL MANAGEMENT LLC | 7,805 | $30K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) added | 7,721 | $30K | 0.0% | 2026-Q1 |
| SIMPLEX TRADING, LLC added | 7,017 | $27K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 6,282 | $24K | 0.0% | 2026-Q1 |
| Durable Capital Partners LP trimmed | 1,023,706 | $14M | 12.9% | 2025-Q3 stale |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 631,663 | $9M | 7.9% | 2025-Q3 stale |
| Parkman Healthcare Partners LLC trimmed | 454,512 | $6M | 5.7% | 2025-Q3 stale |
| Alyeska Investment Group, L.P. | 1,614,582 | $6M | 5.3% | 2025-Q4 stale |
| VANGUARD GROUP INC trimmed | 977,969 | $4M | 3.2% | 2025-Q4 stale |
| TWO SIGMA INVESTMENTS, LP added | 146,598 | $2M | 1.8% | 2025-Q3 stale |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 116,291 | $2M | 1.5% | 2025-Q3 stale |
| Schonfeld Strategic Advisors LLC trimmed | 114,800 | $2M | 1.4% | 2025-Q3 stale |
| Walleye Capital LLC trimmed | 56,101 | $1M | 1.0% | 2025-Q2 stale |
| NORGES BANK | 461,400 | $1M | 0.9% | 2025-Q1 stale |
| TD Asset Management Inc trimmed | 53,266 | $1M | 0.9% | 2025-Q2 stale |
| Susquehanna Portfolio Strategies, LLC added | 58,972 | $833K | 0.7% | 2025-Q3 stale |
| Y-Intercept (Hong Kong) Ltd trimmed | 54,005 | $763K | 0.7% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP added | 44,869 | $634K | 0.6% | 2025-Q3 stale |
| MARSHALL WACE, LLP trimmed | 170,758 | $634K | 0.6% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC trimmed | 30,303 | $582K | 0.5% | 2025-Q2 stale |
| Massar Capital Management, LP new | 20,000 | $384K | 0.3% | 2025-Q2 stale |
| STIFEL FINANCIAL CORP added | 79,924 | $297K | 0.3% | 2025-Q4 stale |
| Verition Fund Management LLC trimmed | 15,796 | $223K | 0.2% | 2025-Q3 stale |
| Squarepoint Ops LLC trimmed | 59,285 | $220K | 0.2% | 2025-Q4 stale |
| Graham Capital Management, L.P. added | 51,070 | $189K | 0.2% | 2025-Q4 stale |
| PDT Partners, LLC trimmed | 13,343 | $188K | 0.2% | 2025-Q3 stale |
| Aristides Capital LLC new | 47,700 | $177K | 0.2% | 2025-Q4 stale |
| MetLife Investment Management, LLC | 11,074 | $156K | 0.1% | 2025-Q3 stale |
| Invesco Ltd. trimmed | 10,997 | $155K | 0.1% | 2025-Q3 stale |
| PARADIGM CAPITAL MANAGEMENT INC/NY new | 40,000 | $148K | 0.1% | 2025-Q4 stale |
| TUDOR INVESTMENT CORP ET AL trimmed | 12,028 | $133K | 0.1% | 2025-Q1 stale |
| GSA CAPITAL PARTNERS LLP added | 33,372 | $124K | 0.1% | 2025-Q4 stale |
| Jump Financial, LLC added | 32,771 | $122K | 0.1% | 2025-Q4 stale |
| MILLENNIUM MANAGEMENT LLC trimmed | 30,768 | $114K | 0.1% | 2025-Q4 stale |
| ALGERT GLOBAL LLC trimmed | 30,210 | $112K | 0.1% | 2025-Q4 stale |
| Jain Global LLC new | 20,895 | $78K | 0.1% | 2025-Q4 stale |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 20,000 | $74K | 0.1% | 2025-Q4 stale |
| CITADEL ADVISORS LLC trimmed | 18,770 | $70K | 0.1% | 2025-Q4 stale |
| HRT FINANCIAL LP added | 15,665 | $58K | 0.1% | 2025-Q4 stale |
| HSBC HOLDINGS PLC new | 12,322 | $46K | 0.0% | 2025-Q4 stale |
| ExodusPoint Capital Management, LP | 10,605 | $39K | 0.0% | 2025-Q4 stale |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO trimmed | 1,954 | $38K | 0.0% | 2025-Q2 stale |
| Quantbot Technologies LP trimmed | 2,245 | $32K | 0.0% | 2025-Q3 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.