Blackrock Inc.
Rank #1
8.36%
- Shares
- 30.92M
- Change %
- +1.62%
- Filing
- Jun 30, 2026
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
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.
Section freshness
Prices as of Sep 8, 10:41 AM EDT · Fundamentals checked Sep 8, 10:41 AM EDT · Statements Jun 27, 2026
Ownership read
TMO insider sentiment: Mixed, sale-heavy.
Blackrock Inc. is the largest institutional holder. 45 sales and 1 purchases appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.
Insider flow
TMO
Purchases20
Sales418.61K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
30.92M
Blackrock Inc.
Insider stance
Mixed, sale-heavy
$236.22M sold / $11.04K bought
Latest filing
Aug 31, 2026
Most recent holder or insider filing date
Filings shown
150
30 holder / 120 insider
- Holder rows
- 30
- Market data source
- Latest filing
- Aug 31, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 15
- 5 decreased
- Insider rows
- 120
- Market data source
Top 30 institutional holders
Thermo Fisher Scientific (TMO) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
Vanguard Capital Management LLC
Rank #2
6.57%
- Shares
- 24.28M
- Change %
- -0.02%
- Filing
- Jun 30, 2026
Decreased
State Street Corporation
Rank #3
4.55%
- Shares
- 16.83M
- Change %
- +0.56%
- Filing
- Jun 30, 2026
Increased
FMR, LLC
Rank #4
3.81%
- Shares
- 14.08M
- Change %
- +30.70%
- Filing
- Jun 30, 2026
Increased
Morgan Stanley
Rank #5
2.91%
- Shares
- 10.76M
- Change %
- -0.92%
- Filing
- Jun 30, 2026
Decreased
JPMORGAN CHASE & CO
Rank #6
2.30%
- Shares
- 8.50M
- Change %
- +25.14%
- Filing
- Jun 30, 2026
Increased
Geode Capital Management, LLC
Rank #7
2.27%
- Shares
- 8.38M
- Change %
- -0.30%
- Filing
- Jun 30, 2026
Decreased
Franklin Resources, Inc.
Rank #8
1.97%
- Shares
- 7.27M
- Change %
- +6.73%
- Filing
- Jun 30, 2026
Increased
Vanguard Portfolio Management LLC
Rank #9
1.68%
- Shares
- 6.23M
- Change %
- +1.02%
- Filing
- Jun 30, 2026
Increased
Capital World Investors
Rank #10
1.68%
- Shares
- 6.20M
- Change %
- -6.78%
- Filing
- Jun 30, 2026
Decreased
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund
Rank #11
3.19%
- Shares
- 11.80M
- Change %
- +0.02%
- Filing
- Jun 30, 2026
Increased
VANGUARD INDEX FUNDS-Vanguard 500 Index Fund
Rank #12
2.60%
- Shares
- 9.63M
- Change %
- +0.85%
- Filing
- Jun 30, 2026
Increased
iShares Trust-iShares Core S&P 500 ETF
Rank #13
1.38%
- Shares
- 5.11M
- Change %
- +3.27%
- Filing
- Jun 30, 2026
Increased
Fidelity Concord Street Trust-Fidelity 500 Index Fund
Rank #14
1.30%
- Shares
- 4.81M
- Change %
- +0.80%
- Filing
- Jul 31, 2026
Increased
SPDR S&P 500 ETF TRUST-State Street SPDR S&P 500 ETF Trust
Rank #15
1.24%
- Shares
- 4.57M
- Change %
- +1.47%
- Filing
- Jul 31, 2026
Increased
Fidelity Contrafund
Rank #16
1.06%
- Shares
- 3.91M
- Change %
- +24.58%
- Filing
- Jul 31, 2026
Increased
VANGUARD INDEX FUNDS-Vanguard Value Index Fund
Rank #17
0.96%
- Shares
- 3.54M
- Change %
- +2.97%
- Filing
- Jun 30, 2026
Increased
SELECT SECTOR SPDR TRT-State Street Health Care Select Sector SPDR ETF
Rank #18
0.72%
- Shares
- 2.65M
- Change %
- +0.78%
- Filing
- Jul 31, 2026
Increased
Dodge & Cox Funds-Dodge & Cox Stock Fund
Rank #19
0.56%
- Shares
- 2.06M
- Change %
- +100.00%
- Filing
- Jun 30, 2026
Increased
VANGUARD INSTITUTIONAL INDEX FUNDS-Vanguard Institutional Index Fund
Rank #20
0.55%
- Shares
- 2.02M
- Change %
- -4.77%
- Filing
- Jun 30, 2026
Decreased
| # | Institution | % held | Shares | Filing date |
|---|---|---|---|---|
| 1 | 8.36% | 30.92M | Jun 30, 2026 | |
| 2 | 6.57% | 24.28M | Jun 30, 2026 | |
| 3 | 4.55% | 16.83M | Jun 30, 2026 | |
| 4 | 3.81% | 14.08M | Jun 30, 2026 | |
| 5 | 2.91% | 10.76M | Jun 30, 2026 | |
| 6 | 2.30% | 8.50M | Jun 30, 2026 | |
| 7 | 2.27% | 8.38M | Jun 30, 2026 | |
| 8 | 1.97% | 7.27M | Jun 30, 2026 | |
| 9 | 1.68% | 6.23M | Jun 30, 2026 | |
| 10 | 1.68% | 6.20M | Jun 30, 2026 | |
| 11 | 3.19% | 11.80M | Jun 30, 2026 | |
| 12 | 2.60% | 9.63M | Jun 30, 2026 | |
| 13 | iShares Trust-iShares Core S&P 500 ETF | 1.38% | 5.11M | Jun 30, 2026 |
| 14 | 1.30% | 4.81M | Jul 31, 2026 | |
| 15 | 1.24% | 4.57M | Jul 31, 2026 | |
| 16 | 1.06% | 3.91M | Jul 31, 2026 | |
| 17 | 0.96% | 3.54M | Jun 30, 2026 | |
| 18 | 0.72% | 2.65M | Jul 31, 2026 | |
| 19 | Dodge & Cox Funds-Dodge & Cox Stock Fund | 0.56% | 2.06M | Jun 30, 2026 |
| 20 | 0.55% | 2.02M | Jun 30, 2026 |
Showing 20 of 30 matching institutional rows.
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.
PETTITI GIANLUCA
President
- Shares
- 3.73K
- % company
- <0.01%
- Price
- $309.63
- Value
- $1,155,849
Filed Aug 31, 2026
PETTITI GIANLUCA
President
- Shares
- 4.13K
- % company
- <0.01%
- Price
- $614.38
- Value
- $2,539,233
Filed Aug 31, 2026
CASPER MARC N
Chief Executive Officer
- Shares
- 275
- % company
- <0.01%
- Price
- $309.63
- Value
- $85,148
Filed Aug 24, 2026
CASPER MARC N
Chief Executive Officer
- Shares
- 275
- % company
- <0.01%
- Price
- $627.05
- Value
- $172,439
Filed Aug 24, 2026
CASPER MARC N
Chief Executive Officer
- Shares
- 20.00K
- % company
- <0.01%
- Price
- $309.63
- Value
- $6,192,600
Filed Aug 21, 2026
CASPER MARC N
Chief Executive Officer
- Shares
- 20.00K
- % company
- <0.01%
- Price
- $628.09
- Value
- $12,561,823
Filed Aug 21, 2026
BRITT LISA P
Officer
- Shares
- 11.44K
- % company
- <0.01%
- Price
- $418.32
- Value
- $4,785,581
Filed Aug 19, 2026
BRITT LISA P
Officer
- Shares
- 11.44K
- % company
- <0.01%
- Price
- $613.12
- Value
- $7,014,093
Filed Aug 19, 2026
SHAFER MICHAEL D
Officer
- Shares
- 25.50K
- % company
- <0.01%
- Price
- $370.58
- Value
- $9,449,832
Filed Aug 11, 2026
SHAFER MICHAEL D
Officer
- Shares
- 25.50K
- % company
- <0.01%
- Price
- $600.00
- Value
- $15,300,000
Filed Aug 11, 2026
CASPER MARC N
Chief Executive Officer
- Shares
- 275
- % company
- <0.01%
- Price
- $309.63
- Value
- $85,148
Filed Aug 7, 2026
HOLMES JOSEPH R.
Officer
- Shares
- 420
- % company
- <0.01%
- Price
- $309.63
- Value
- $130,045
Filed Aug 7, 2026
| # | Insider | % company | Action | Shares | Filing date |
|---|---|---|---|---|---|
| 1 | PETTITI GIANLUCA President | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 3.73K | Aug 31, 2026 |
| 2 | PETTITI GIANLUCA President | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.13K | Aug 31, 2026 |
| 3 | CASPER MARC N Chief Executive Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 275 | Aug 24, 2026 |
| 4 | CASPER MARC N Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 275 | Aug 24, 2026 |
| 5 | CASPER MARC N Chief Executive Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 20.00K | Aug 21, 2026 |
| 6 | CASPER MARC N Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 20.00K | Aug 21, 2026 |
| 7 | BRITT LISA P Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 11.44K | Aug 19, 2026 |
| 8 | BRITT LISA P Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 11.44K | Aug 19, 2026 |
| 9 | SHAFER MICHAEL D Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 25.50K | Aug 11, 2026 |
| 10 | SHAFER MICHAEL D Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 25.50K | Aug 11, 2026 |
| 11 | CASPER MARC N Chief Executive Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 275 | Aug 7, 2026 |
| 12 | HOLMES JOSEPH R. Officer | <0.01% | Conversion of Exercise of derivative securityProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 420 | Aug 7, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding.
Frequently asked
Common questions.
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 30 institutional rows on file: 15 increased or initiated positions and 5 reduced them as of Aug 31, 2026.
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 purchases. 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.