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 Sep 30, 2025
Ownership Breakdown
2,592
Institutional Holders
▲ 49 vs Q2
$160.65B
Total Inst. Value
▲ $25.17B vs Q2
371.62M
Shares Outstanding
freeFloat 99.76%
331.70M
13F Shares Held
▼ 4.40M 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
TMO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC measuring & controlling devices, nec | 33.85M | 8.95% | 8.95% | $16.42T | Nov 7, 2025 | ▲ 56.2K |
BLACKROCK, INC. measuring & controlling devices, nec | 29.64M | 7.84% | 7.84% | $14.37T | Nov 12, 2025 | ▲ 2.31M |
STATE STREET CORP measuring & controlling devices, nec | 16.38M | 4.33% | 4.33% | $7.95T | Nov 14, 2025 | ▼ 96.8K |
MORGAN STANLEY measuring & controlling devices, nec | 12.72M | 3.37% | 3.37% | $6.17T | May 27, 2026 | ▼ 155.7K |
CAPITAL WORLD INVESTORS measuring & controlling devices, nec | 10.29M | 2.72% | 2.72% | $4.99T | Nov 13, 2025 | ▲ 706.6K |
GEODE CAPITAL MANAGEMENT, LLC measuring & controlling devices, nec | 8.17M | 2.16% | 2.16% | $3.94T | Nov 12, 2025 | ▲ 55.3K |
FMR LLC measuring & controlling devices, nec | 7.59M | 2.01% | 2.01% | $3.68T | Nov 13, 2025 | ▲ 3.60M |
JPMORGAN CHASE & CO measuring & controlling devices, nec | 7.27M | 1.92% | 1.92% | $3.53T | Nov 26, 2025 | ▼ 1.88M |
PRICE T ROWE ASSOCIATES INC /MD/ measuring & controlling devices, nec | 6.47M | 1.71% | 1.71% | $3.14T | Nov 14, 2025 | ▲ 911.8K |
FRANKLIN RESOURCES INC measuring & controlling devices, nec | 5.93M | 1.57% | 1.57% | $2.87T | Nov 13, 2025 | ▲ 1.03M |
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
28
Increased
+18.62M shares0
New Positions
first time holders21
Decreased
−8.07M shares0
Sold Out
fully exitedNet shares change (top 50)
+10.56M
+18.62M / −8.07M
Net new holders
+7
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 89.3% of total shares outstanding. Company insiders own approximately 0.24%, while retail and public investors account for the remaining 10.50%.
The largest institutional shareholder of Thermo Fisher Scientific Inc. is VANGUARD GROUP INC, holding approximately 33.85 million shares — equal to 8.95% of outstanding shares — as of September 30, 2025.
A total of 2,592 institutional investors currently hold TMO stock, with a combined institutional value of approximately $160.65 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 89.3% of shares. The largest shareholder is VANGUARD GROUP INC with a 8.95% stake. Company insiders hold 0.24%. Data sourced from SEC Form 13F as of September 30, 2025.