Thermo Fisher Scientific Inc. (TMO) Ownership
TMO ownership summary
as of October 18, 2026- Institutions
- 94.0% of shares outstanding
- Insiders
- 0.13% of shares outstanding
- Shares outstanding
- 369.7M
- Float
- 368.8M shares available to trade
- Short interest
- 1.46% 5.4M shares short
- Days to cover
- 2.46 short interest down 5.0% vs prior month
- Institutions 93.98%
- Insiders 0.13%
- Other investors 5.89%
TMO top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 8.36% | 30.9M | $21.33B | +492,440 (+1.6%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.57% | 24.3M | $16.75B | −4,500 (−0.0%) | June 30, 2026 |
| 3 | State Street Corp | 4.55% | 16.8M | $11.61B | +94,211 (+0.6%) | June 30, 2026 |
| 4 | FMR Inc | 3.81% | 14.1M | $9.72B | +3.3M (+30.7%) | June 30, 2026 |
| 5 | Morgan Stanley - Brokerage Accounts | 2.91% | 10.8M | $7.43B | −100,462 (−0.9%) | June 30, 2026 |
| 6 | JPMorgan Chase & Co | 2.30% | 8.5M | $5.87B | +1.7M (+25.1%) | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 2.27% | 8.4M | $5.78B | −25,490 (−0.3%) | June 30, 2026 |
| 8 | Franklin Templeton Inc | 1.97% | 7.3M | $5.02B | +458,483 (+6.7%) | June 30, 2026 |
| 9 | Vanguard Portfolio Management, LLC | 1.68% | 6.2M | $4.30B | +62,799 (+1.0%) | June 30, 2026 |
| 10 | Capital World Investors | 1.68% | 6.2M | $4.27B | −450,946 (−6.8%) | June 30, 2026 |
| 11 | T. Rowe Price Associates, Inc. | 1.38% | 5.1M | $3.53B | −1.2M (−19.0%) | June 30, 2026 |
| 12 | NORGES BANK | 1.38% | 5.1M | $3.51B | −214,960 (−4.1%) | June 30, 2026 |
| 13 | Capital Research Global Investors | 1.12% | 4.1M | $2.86B | −267,076 (−6.0%) | June 30, 2026 |
| 14 | Bank of New York Mellon Corp | 1.07% | 3.9M | $2.72B | +171,796 (+4.6%) | June 30, 2026 |
| 15 | Bank of America Corp | 1.05% | 3.9M | $2.69B | −1.6M (−29.6%) | June 30, 2026 |
| 16 | Royal Bank of Canada | 0.93% | 3.4M | $2.37B | −483,105 (−12.3%) | June 30, 2026 |
| 17 | Northern Trust Corp | 0.90% | 3.3M | $2.30B | −86,774 (−2.5%) | June 30, 2026 |
| 18 | Capital Research & Mgmt Co - Division 3 | 0.86% | 3.2M | $2.20B | −706,575 (−18.2%) | June 30, 2026 |
| 19 | Charles Schwab Investment Management Inc | 0.84% | 3.1M | $2.15B | +179,685 (+6.1%) | June 30, 2026 |
| 20 | Dodge & Cox | 0.83% | 3.1M | $2.11B | +3.0M (+11,767.4%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 9.5M shares and 11 cut 5.2M.
TMO top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.19% | 11.8M | $8.15B | −22,863 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.63% | 9.7M | $6.70B | −159,819 (−1.6%) | September 30, 2026 |
| 3 | iShares Core S&P 500 ETF | 1.33% | 4.9M | $3.40B | −7,918 (−0.2%) | September 30, 2026 |
| 4 | Fidelity 500 Index | 1.30% | 4.8M | $3.33B | +18,530 (+0.4%) | August 31, 2026 |
| 5 | State Street® SPDR® S&P 500® ETF | 1.23% | 4.5M | $3.13B | — | September 30, 2026 |
| 6 | Fidelity Contrafund | 1.12% | 4.1M | $2.85B | +217,254 (+5.6%) | August 31, 2026 |
| 7 | Vanguard MStar Value Index Investor | 0.95% | 3.5M | $2.43B | −30,755 (−0.9%) | September 30, 2026 |
| 8 | State Street®HlthCrSelSectSPDR®ETF | 0.71% | 2.6M | $1.81B | +8,160 (+0.3%) | September 30, 2026 |
| 9 | Dodge & Cox Stock I | 0.56% | 2.1M | $1.42B | +2.1M (0.0%) | June 30, 2026 |
| 10 | Vanguard Institutional Index I | 0.53% | 2.0M | $1.35B | −30,627 (−1.5%) | September 30, 2026 |
| 11 | American Funds American Balanced A | 0.48% | 1.8M | $1.22B | +482,106 (+37.4%) | September 30, 2026 |
| 12 | Putnam Large Cap Value A | 0.47% | 1.7M | $1.19B | — | August 31, 2026 |
| 13 | Strategic Advisers Fidelity US TtlStk | 0.44% | 1.6M | $1.11B | +17,142 (+1.1%) | August 31, 2026 |
| 14 | American Funds Fundamental Invs A | 0.43% | 1.6M | $1.10B | +255,849 (+19.2%) | September 30, 2026 |
| 15 | American Funds Growth Fd of Amer A | 0.41% | 1.5M | $1.04B | −154,244 (−9.3%) | September 30, 2026 |
| 16 | American Funds New Perspective A | 0.40% | 1.5M | $1.01B | — | September 30, 2026 |
| 17 | American Funds Invmt Co of Amer A | 0.37% | 1.4M | $932.0M | +37,538 (+2.9%) | September 30, 2026 |
| 18 | Vanguard PRIMECAP Inv | 0.33% | 1.2M | $846.5M | — | June 30, 2026 |
| 19 | American Funds Washington Mutual A | 0.32% | 1.2M | $823.3M | — | September 30, 2026 |
| 20 | Putnam Focused Large Cap Value ETF | 0.31% | 1.1M | $784.5M | +656,676 (+136.7%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
TMO insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-10 | Ro Khanna | Sell | $500.14 | — | — |
| 2026-03-06 | Ro Khanna | Buy | $501.72 | — | — |
| 2026-03-04 | Marc N Casper | Sell | $512.40 | 5,000 | $2.6M |
| 2026-02-24 | Ro Khanna | Buy | $515.79 | — | — |
| 2026-02-09 | Gianluca Pettiti | Sell | $541.20 | 400 | $216,480 |
| 2026-02-05 | Ro Khanna | Buy | $541.94 | — | — |
| 2026-01-29 | Ro Khanna | Sell | $593.16 | — | — |
| 2026-01-22 | Ro Khanna | Sell | $639.03 | — | — |
| 2026-01-12 | Ro Khanna | Sell | $615.60 | — | — |
| 2025-12-04 | Michel Lagarde | Sell | $563.56 | 22,046 | $12.4M |
| 2025-12-03 | Michel Lagarde | Sell | $583.39 | 32,000 | $18.7M |
| 2025-12-02 | Frederick M Lowery | Sell | $581.94 | 6,912 | $4.0M |
| 2025-12-02 | Michel Lagarde | Sell | $581.92 | 30,000 | $17.5M |
| 2025-12-01 | Frederick M Lowery | Sell | $597.68 | 6,913 | $4.1M |
| 2025-11-25 | Michael D Shafer | Sell | $600.00 | 10,725 | $6.4M |
| 2025-11-13 | Michel Lagarde | Sell | $594.42 | 4,638 | $2.8M |
| 2025-11-12 | Lisa P Britt | Sell | $588.26 | 1,058 | $622,379 |
| 2025-11-07 | Lisa P Britt | Sell | $571.62 | 10,225 | $5.8M |
| 2025-11-07 | Ro Khanna | Buy | $572.72 | — | — |
| 2025-10-31 | Lisa C. McClain | Sell | $568.25 | — | — |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
TMO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns TMO
Institutional investors own 94.0% of Thermo Fisher's shares and insiders 0.13%. The largest holder is BlackRock Inc with 8.36% of the shares (30.9M), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 11 reduced their stake in the latest filings. Short interest is 1.46% of the float, or 2.46 days of average trading volume. The share count fell 6.1% since 2014.
Related: TMO analyst forecast, TMO key metrics, TMO dividend history. See the TMO stock overview for the latest quote and news.
TMO ownership FAQ
Who owns the most Thermo Fisher stock?
The largest shareholders of Thermo Fisher are BlackRock Inc (8.36%), Vanguard Capital Management, LLC (6.57%), State Street Corp (4.55%), FMR Inc (3.81%), Morgan Stanley - Brokerage Accounts (2.91%).
What percentage of Thermo Fisher is owned by institutions?
Institutions hold 94.0% of Thermo Fisher's shares outstanding; insiders hold 0.13%.
Which funds own Thermo Fisher?
The largest fund holders of Thermo Fisher are Vanguard MStar Total Stk Mkt Idx Invest (3.19%), Vanguard 500 Index Investor (2.63%), iShares Core S&P 500 ETF (1.33%), Fidelity 500 Index (1.30%), State Street® SPDR® S&P 500® ETF (1.23%).
What is Thermo Fisher's short interest?
5.4M shares of Thermo Fisher were sold short, 1.46% of the float; at the average daily volume it would take 2.46 days to cover.
Are insiders buying or selling Thermo Fisher?
Of the latest 20 reported insider transactions in Thermo Fisher (since October 31, 2025), 4 were purchases and 16 were sales.
How many shares of Thermo Fisher are outstanding?
Thermo Fisher has 369.7M shares outstanding, of which 368.8M are in the public float.