Thermo Fisher Scientific Inc.
Thermo Fisher Scientific Inc. (TMO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · TMO · as of Mar 31, 2025
Ownership Breakdown
2,653
Institutional Holders
▼ 46 vs Q4
$168.51B
Total Inst. Value
▼ $7.64B vs Q4
371.62M
Shares Outstanding
freeFloat 99.76%
339.32M
13F Shares Held
▲ 934,174 vs Q4
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
TMO largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC measuring & controlling devices, nec | 33.48M | 8.86% | 8.86% | $16.66T | May 9, 2025 | ▲ 230.4K |
BLACKROCK, INC. measuring & controlling devices, nec | 29.08M | 7.69% | 7.69% | $14.47T | May 2, 2025 | ▲ 244.3K |
STATE STREET CORP measuring & controlling devices, nec | 16.54M | 4.38% | 4.38% | $8.24T | May 15, 2025 | ▲ 91.5K |
MORGAN STANLEY measuring & controlling devices, nec | 11.60M | 3.07% | 3.07% | $5.77T | May 15, 2025 | ▲ 105.1K |
CAPITAL WORLD INVESTORS measuring & controlling devices, nec | 11.06M | 2.93% | 2.93% | $5.50T | May 12, 2025 | ▲ 1.63M |
JPMORGAN CHASE & CO measuring & controlling devices, nec | 10.14M | 2.68% | 2.68% | $5.04T | May 12, 2025 | ▲ 1.22M |
PRICE T ROWE ASSOCIATES INC /MD/ measuring & controlling devices, nec | 9.30M | 2.46% | 2.46% | $4.63T | May 14, 2025 | ▼ 1.61M |
GEODE CAPITAL MANAGEMENT, LLC measuring & controlling devices, nec | 8.13M | 2.15% | 2.15% | $4.03T | May 13, 2025 | ▲ 269.8K |
CAPITAL RESEARCH GLOBAL INVESTORS measuring & controlling devices, nec | 7.61M | 2.01% | 2.01% | $3.79T | May 12, 2025 | ▼ 307.9K |
NORGES BANK measuring & controlling devices, nec | 6.19M | 1.64% | 1.64% | $3.08T | May 11, 2026 | ▲ 133.1K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
33
Increased
+8.59M shares0
New Positions
first time holders17
Decreased
−6.28M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.30M
+8.59M / −6.28M
Net new holders
+16
0 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
TMO 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
2
Sell transactions
5.00
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 |
|---|---|---|---|---|---|---|---|
WEISLER DION J director | May 20, 2026 | Award | 499 | — | — | 5.4K | Form 4 ↗ |
WEISLER DION J director | May 20, 2026 | Tax Withhold | 80.287 | $451.79 | $36.3K | 4.9K | Form 4 ↗ |
SPERLING SCOTT M director | May 20, 2026 | Award | 499 | — | — | 69.5K | Form 4 ↗ |
Spar Debora L director | May 20, 2026 | Award | 499 | — | — | 2.6K | Form 4 ↗ |
Lynch Karen S director | May 20, 2026 | Award | 499 | — | — | 1.2K | Form 4 ↗ |
Keith R. Alexandra director | May 20, 2026 | Award | 499 | — | — | 2.6K | Form 4 ↗ |
JOHNSON JENNIFER M director | May 20, 2026 | Award | 499 | — | — | 1.4K | Form 4 ↗ |
Jacks Tyler director | May 20, 2026 | Award | 499 | — | — | 9.5K | Form 4 ↗ |
HARRIS C MARTIN director | May 20, 2026 | Award | 499 | — | — | 9.5K | Form 4 ↗ |
CHANDY RUBY R director | May 20, 2026 | Award | 499 | — | — | 3.5K | 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
Thermo Fisher Scientific Inc. (TMO) is primarily owned by institutional investors, who hold approximately 91.3% of total shares outstanding. Company insiders own approximately 0.24%, while retail and public investors account for the remaining 8.45%.
The largest institutional shareholder of Thermo Fisher Scientific Inc. is VANGUARD GROUP INC, holding approximately 33.48 million shares — equal to 8.86% of outstanding shares — as of March 31, 2025.
A total of 2,653 institutional investors currently hold TMO stock, with a combined institutional value of approximately $168.51 billion as of the most recent 13F filing period.
Frequently asked questions
TMO ownershipThermo Fisher Scientific Inc. (TMO) is primarily owned by institutional investors, who hold approximately 91.3% of shares. The largest shareholder is VANGUARD GROUP INC with a 8.86% stake. Company insiders hold 0.24%. Data sourced from SEC Form 13F as of March 31, 2025.