NYSE · Healthcare · Holders
Thermo Fisher Scientific (TMO) Institutional Ownership & Insider Trading History
Top TMO institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
- Last confirmed price
- $673.82-0.40%
- Oct 23, 2026, 4:00 PM EDT · Prices may be delayed
Data dates
Prices as of Oct 23, 4:00 PM EDT · Fundamentals checked Oct 25, 1:10 AM EDT · Statement period ended Jun 27, 2026
Ownership read
TMO insider transaction activity: Mixed, sale-heavy.
Blackrock Inc. is the largest institutional holder. 45 classified sales and 1 classified purchase appear in the recent insider records. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.
Insider flow
TMO
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
30.92M
Blackrock Inc.
Insider transaction activity
Mixed, sale-heavy
$236.22M sold / $11.04K bought
Observations shown
130
10 holder / 120 insider
- Increased / initiated
- Unavailable
- Prior positions were not supplied
- Insider rows
- 120
- Transaction dates shown per row
Ownership concentration and transaction activity
- Top 10 reported holders
- 36.10% outstanding
- Changes with share-count history
- Prior-position data unavailable
- New / exited positions
- Prior-position data unavailable
- Largest increase with share-count history
- Prior share counts unavailable
These changes cover the holders shown. A holder missing from this list may still own shares. Compare positions from the same reporting quarters.
Net shares sold: 418,585
Sale-code S shares minus purchase-code P shares in this sample. Includes disclosed plans and unknown plan status; excludes grants, gifts, exercises and withholding. This is activity, not sentiment.
- Purchase / sale; plan unknown: 46
- Conversion / exercise: 29
- Grant: 41
- Gift: 4
Top 10 institutional holders
Thermo Fisher Scientific (TMO) institutional ownership
Ranked by reported share count, with position changes and separate position and filing dates where ownership data supplies them.
| # | Institution | % held | Shares | Position / filing date |
|---|---|---|---|---|
| 1 | 8.36% | 30.92M | Position as of Jun 30, 2026Filing date unknown | |
| 2 | 6.57% | 24.28M | Position as of Jun 30, 2026Filing date unknown | |
| 3 | 4.55% | 16.83M | Position as of Jun 30, 2026Filing date unknown | |
| 4 | 3.81% | 14.08M | Position as of Jun 30, 2026Filing date unknown | |
| 5 | 2.91% | 10.76M | Position as of Jun 30, 2026Filing date unknown | |
| 6 | 2.30% | 8.50M | Position as of Jun 30, 2026Filing date unknown | |
| 7 | 2.27% | 8.38M | Position as of Jun 30, 2026Filing date unknown | |
| 8 | 1.97% | 7.27M | Position as of Jun 30, 2026Filing date unknown | |
| 9 | 1.68% | 6.23M | Position as of Jun 30, 2026Filing date unknown | |
| 10 | 1.68% | 6.20M | Position as of Jun 30, 2026Filing date unknown |
Recent insider transactions
Thermo Fisher Scientific (TMO) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding. Window: Nov 1, 2024–Aug 31, 2026 · 120 records.
| # | Insider | % company | Action | Shares | Price | Value | Transaction / filing |
|---|---|---|---|---|---|---|---|
| 1 | PETTITI GIANLUCA President | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 4.13K | $614.38 | $2,539,233 | Aug 31, 2026Filing date unavailableOriginal filing link unavailable |
| 2 | PETTITI GIANLUCA President | <0.01% | ConversionConversion or exercise of derivative securities. Read alongside sale rows before treating it as bearish.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 3.73K | $309.63 | $1,155,849 | Aug 31, 2026Filing date unavailableOriginal filing link unavailable |
| 3 | CASPER MARC N Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 275 | $627.05 | $172,439 | Aug 24, 2026Filing date unavailableOriginal filing link unavailable |
| 4 | CASPER MARC N Chief Executive Officer | <0.01% | ConversionConversion or exercise of derivative securities. Read alongside sale rows before treating it as bearish.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 275 | $309.63 | $85,148 | Aug 24, 2026Filing date unavailableOriginal filing link unavailable |
| 5 | CASPER MARC N Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 20.00K | $628.09 | $12,561,823 | Aug 21, 2026Filing date unavailableOriginal filing link unavailable |
| 6 | CASPER MARC N Chief Executive Officer | <0.01% | ConversionConversion or exercise of derivative securities. Read alongside sale rows before treating it as bearish.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 20.00K | $309.63 | $6,192,600 | Aug 21, 2026Filing date unavailableOriginal filing link unavailable |
| 7 | BRITT LISA P Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 11.44K | $613.12 | $7,014,093 | Aug 19, 2026Filing date unavailableOriginal filing link unavailable |
| 8 | BRITT LISA P Officer | <0.01% | ConversionConversion or exercise of derivative securities. Read alongside sale rows before treating it as bearish.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 11.44K | $418.32 | $4,785,581 | Aug 19, 2026Filing date unavailableOriginal filing link unavailable |
| 9 | SHAFER MICHAEL D Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 25.50K | $600.00 | $15,300,000 | Aug 11, 2026Filing date unavailableOriginal filing link unavailable |
| 10 | SHAFER MICHAEL D Officer | <0.01% | ConversionConversion or exercise of derivative securities. Read alongside sale rows before treating it as bearish.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 25.50K | $370.58 | $9,449,832 | Aug 11, 2026Filing date unavailableOriginal filing link unavailable |
| 11 | HOLMES JOSEPH R. Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 420 | $584.81 | $245,620 | Aug 7, 2026Filing date unavailableOriginal filing link unavailable |
| 12 | CASPER MARC N Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4.Transaction context
Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership. | 4.88K | $586.12 | $2,862,002 | Aug 7, 2026Filing date unavailableOriginal filing link unavailable |
Frequently asked
Questions about this quote
Who are the largest TMO shareholders?
Blackrock Inc. is the largest reported institutional holder of TMO, with 30.92 million shares, or about 8.36% of shares outstanding.
What does the institutional filing activity show for TMO?
Thermo Fisher Scientific has 10 institutional rows on file. Previous position sizes are unavailable, so increases and reductions cannot be determined.
What insider transactions are available for TMO?
TECHi shows 120 dated TMO insider transactions through Aug 31, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.
Are TMO insiders buying or selling?
The displayed TMO activity reads Mixed, sale-heavy: 45 sales and 1 purchase. Other transaction types remain separate.
Who is the most active reported TMO insider?
CASPER MARC N has the largest absolute share movement in the displayed TMO filing rows, totaling 368,242 shares. The action labels provide the transaction context.
What this page answers
Check who owns the float and whether insiders are active.
Explore Institutional concentration, insider transaction pattern, and float context.
Keep in mind Filings are delayed or transactions are administrative rather than economic.
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