Outset Medical, Inc.
Outset Medical, Inc. (OM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · OM · as of Sep 30, 2025
Ownership Breakdown
98
Institutional Holders
▲ 5 vs Q2
$250.20M
Total Inst. Value
▼ $101.59M vs Q2
18.54M
Shares Outstanding
freeFloat 95.82%
17.65M
13F Shares Held
▼ 1.02M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
OM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC electromedical & electrotherapeutic apparatus | 2.66M | 15.02% | 15.02% | $37.63B | Nov 13, 2025 | ▲ 64.4K |
PFM HEALTH SCIENCES, LP electromedical & electrotherapeutic apparatus | 1.73M | 9.75% | 9.75% | $24.43B | Nov 14, 2025 | ▲ 65.2K |
ALYESKA INVESTMENT GROUP, L.P. electromedical & electrotherapeutic apparatus | 1.61M | 9.10% | 9.10% | $22.80B | Nov 17, 2025 | ▲ 150.0K |
WOODLINE PARTNERS LP electromedical & electrotherapeutic apparatus | 1.33M | 7.47% | 7.47% | $18.72B | Nov 14, 2025 | ▲ 71 |
BLACKROCK, INC. electromedical & electrotherapeutic apparatus | 1.25M | 7.04% | 7.04% | $17.64B | Nov 12, 2025 | ▲ 265.1K |
DURABLE CAPITAL PARTNERS LP electromedical & electrotherapeutic apparatus | 1.02M | 5.77% | 5.77% | $14.45B | Nov 14, 2025 | ▼ 633.4K |
VANGUARD GROUP INC electromedical & electrotherapeutic apparatus | 982.6K | 5.54% | 5.54% | $13.87B | Nov 7, 2025 | ▼ 8.8K |
PERCEPTIVE ADVISORS LLC electromedical & electrotherapeutic apparatus | 833.3K | 4.70% | 4.70% | $11.77B | Nov 14, 2025 | — held |
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ electromedical & electrotherapeutic apparatus | 631.7K | 3.56% | 3.56% | $8.92B | Oct 29, 2025 | ▼ 4.7K |
PARKMAN HEALTHCARE PARTNERS LLC electromedical & electrotherapeutic apparatus | 454.5K | 2.56% | 2.56% | $6.42B | Nov 14, 2025 | ▼ 94.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
25
Increased
+2.01M shares6
New Positions
first time holders17
Decreased
−1.25M shares0
Sold Out
fully exitedNet shares change (top 50)
+762.8K
+2.01M / −1.25M
Net new holders
+14
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
OM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
10
Buy transactions
4
Sell transactions
2.50
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
HACKETT PATRICK T director | Jun 4, 2026 | Award | 10,667 | — | — | 105.8K | Form 4 ↗ |
OBOYLE KEVIN C director | Jun 4, 2026 | Award | 10,667 | — | — | 34.8K | Form 4 ↗ |
Prange Karen director | Jun 4, 2026 | Award | 10,667 | — | — | 29.3K | Form 4 ↗ |
LANG BRENT D. director | Jun 4, 2026 | Award | 10,667 | — | — | 28.5K | Form 4 ↗ |
GROSSMAN D KEITH director | Jun 4, 2026 | Award | 10,667 | — | — | 24.6K | Form 4 ↗ |
Drexler Karen director | Jun 4, 2026 | Award | 10,667 | — | — | 21.3K | Form 4 ↗ |
Gaeta Renee Chief Financial Officer | Jun 3, 2026 | Sale | 17,672 | $4.94 | $87.3K | 113.8K | Form 4 ↗ |
Trigg Leslie Chair and CEO | May 15, 2026 | Sale | 3,445 | $3.70 | $12.7K | 98.9K | Form 4 ↗ |
Nash Marc EVP Operations R&D & Service | May 15, 2026 | Sale | 1,582 | $3.70 | $5.9K | 38.4K | Form 4 ↗ |
Brottem John L. General Counsel | May 15, 2026 | Sale | 2,638 | $3.70 | $9.8K | 30.3K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Outset Medical, Inc. (OM) is primarily owned by institutional investors, who hold approximately 95.2% of total shares outstanding. Company insiders own approximately 4.18%, while retail and public investors account for the remaining 0.58%.
The largest institutional shareholder of Outset Medical, Inc. is FMR LLC, holding approximately 2.66 million shares — equal to 15.02% of outstanding shares — as of September 30, 2025.
A total of 98 institutional investors currently hold OM stock, with a combined institutional value of approximately $250,202,540 as of the most recent 13F filing period.
Frequently asked questions
OM ownershipOutset Medical, Inc. (OM) is primarily owned by institutional investors, who hold approximately 95.2% of shares. The largest shareholder is FMR LLC with a 15.02% stake. Company insiders hold 4.18%. Data sourced from SEC Form 13F as of September 30, 2025.