Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in TMO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 30.5M | $14.97B | -0.7% | 8.194% | 0.26% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 24.3M | $11.93B | — | 6.534% | 0.30% |
| 3 | STATE STREET CORP | 16.7M | $8.23B | +0.7% | 4.502% | 0.28% |
| 4 | MORGAN STANLEY | 10.9M | $5.34B | -8.7% | 2.923% | 0.32% |
| 5 | FMR LLC | 10.8M | $5.30B | +10.0% | 2.900% | 0.29% |
| 6 | Kentucky Farm Bureau Mutual Insurance Co | 13K | $4.22B | — | 0.003% | 0.10% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 8.4M | $4.11B | +2.6% | 2.262% | 0.26% |
| 8 | FRANKLIN RESOURCES INC | 6.8M | $3.35B | +7.3% | 1.833% | 0.82% |
| 9 | Capital World Investors | 6.6M | $3.27B | -39.6% | 1.789% | 0.45% |
| 10 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.2M | $3.03B | — | 1.658% | 0.16% |
| 11 | BANK OF AMERICA CORP /DE/ | 5.5M | $2.72B | -6.9% | 1.489% | 0.20% |
| 12 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 3.0M | $2.25B | -2.4% | 0.811% | 0.76% |
| 13 | Capital Research Global Investors | 4.4M | $2.17B | +51.4% | 1.188% | 0.34% |
| 14 | ROYAL BANK OF CANADA | 3.9M | $1.93B | -3.0% | 1.055% | 0.34% |
| 15 | Capital International Investors | 3.9M | $1.91B | +322.6% | 1.046% | 0.45% |
| 16 | Bank of New York Mellon Corp | 3.8M | $1.85B | +1.1% | 1.014% | 0.34% |
| 17 | NORTHERN TRUST CORP | 3.4M | $1.68B | -1.0% | 0.919% | 0.22% |
| 18 | GOLDMAN SACHS GROUP INC | 3.3M | $1.61B | +1.5% | 0.879% | 0.18% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.9M | $1.44B | +3.2% | 0.790% | 0.22% |
| 20 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 2.9M | $1.43B | -17.5% | 0.784% | 1.40% |
| 21 | Fisher Asset Management, LLC | 2.9M | $1.40B | +2.1% | 0.767% | 0.48% |
| 22 | ALLIANCEBERNSTEIN L.P. | 2.2M | $1.27B | -10.6% | 0.590% | 0.41% |
| 23 | UBS Group AG | 2.6M | $1.27B | +0.8% | 0.695% | 0.19% |
| 24 | Grantham, Mayo, Van Otterloo & Co. LLC | 2.5M | $1.23B | +3.7% | 0.673% | 3.15% |
| 25 | UBS ASSET MANAGEMENT AMERICAS INC | 2.4M | $1.20B | +0.9% | 0.659% | 0.25% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in TMO — a direct measure of their conviction.
Filings activity in TMO during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 2,537 | 3.8% | 90.96% | 17.59 pp | $158.65B | 16% |
| Q4 2025 | 2,637 | +7.6% | 108.55% | +17.80 pp | $189.32B | +20% |
| Q3 2025 | 2,450 | +2.0% | 90.75% | +9.37 pp | $158.28B | +12% |
| Q2 2025 | 2,401 | 4.0% | 81.38% | 11.82 pp | $141.94B | 13% |
| Q1 2025 | 2,501 | 0.7% | 93.20% | +1.01 pp | $162.55B | +1.1% |
| Q4 2024 | 2,518 | +1.2% | 92.19% | 17.74 pp | $160.80B | 16% |
| Q3 2024 | 2,489 | +1.5% | 109.93% | 22.70 pp | $191.74B | 17% |
| Q2 2024 | 2,452 | — | 132.63% | — | $231.33B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying TMO stock.
Based on Q1 2026 13F filings, institutional ownership of Thermo Fisher Scientific Inc. stands at 91.0%, held across 2,537 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of TMO, with approximately 30,450,692 shares worth $14.97B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of TMO, including Fisher Asset Management, LLC.
Our composite Smart Money Score for TMO is 28 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
200 institutions opened new positions in TMO during Q1 2026, while 300 fully exited. 292 added to existing positions and 2,035 trimmed.
TMO institutional ownership fell by 17.59 percentage points quarter-over-quarter, with a net change of -100 holders.
The top 10 institutions account for 40.2% of all reported 13F value in TMO, and the top 25 account for 56.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Thermo Fisher Scientific Inc. (TMO) Institutional Ownership