Keith R. Alexandra
- Shares
- 2.60K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NYSE · HEALTHCARE · Holders
Thermo Fisher Scientific Inc (TMO) Institutional Ownership & Insider Trading History
Recent insider purchases and sales for TMO from Form 4 filings. Institutional holdings surface here when ownership sources publish.
Section freshness
Price Jun 23, 4:00 PM EDT · Statements Mar 30, 8:00 PM EDT
Source timingDetailsHide
Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 hr
Provider checked •
Source: Market data provider
Newsevery 4 hr
Latest item •
Source: Market data provider
Ownership read
TMO insider sentiment: Net selling.
41 sales and 0 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
TMO
Purchases—
Sales4.49M
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
—
Institutional data pending
Insider stance
Net selling
$2.30B sold / — bought
Latest filing
May 20, 2026
Most recent holder or insider filing date
Filings shown
120
0 holder / 120 insider
- Holder rows
- Pending
- Market data source
- Latest filing
- May 20, 2026
- Most recent holder or insider filing date
- Increased / initiated
- Pending
- 0 decreased
- Insider rows
- 120
- Market data source
Recent insider transactions
Thermo Fisher Scientific Inc (TMO) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
WEISLER DION J
- Shares
- 5.45K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
WEISLER DION J
- Shares
- 4.95K
- % company
- <0.01%
- Price
- $451.79
- Value
- $2,235,005
Filed May 20, 2026
Spar Debora L
- Shares
- 2.61K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
Jacks Tyler
- Shares
- 9.46K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
CHANDY RUBY R
- Shares
- 3.46K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
Lynch Karen S
- Shares
- 1.16K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
Chai Nelson
- Shares
- 15.32K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
HARRIS C MARTIN
- Shares
- 9.53K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
SPERLING SCOTT M
- Shares
- 69.48K
- % company
- 0.02%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
JOHNSON JENNIFER M
- Shares
- 1.40K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 20, 2026
Pettiti Gianluca
- Shares
- 25.05K
- % company
- <0.01%
- Price
- $462.66
- Value
- $11,590,096
Filed Apr 27, 2026
Keith R. Alexandra
- Shares
- 1.27K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 28, 2026
WEISLER DION J
- Shares
- 2.72K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 28, 2026
Lynch Karen S
- Shares
- 291
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 28, 2026
SPERLING SCOTT M
- Shares
- 17.59K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 28, 2026
JOHNSON JENNIFER M
- Shares
- 661
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 28, 2026
Shafer Michael D
- Shares
- 20.95K
- % company
- <0.01%
- Price
- $499.40
- Value
- $10,462,430
Filed Mar 11, 2026
CASPER MARC N
- Shares
- 40.55K
- % company
- 0.01%
- Price
- No cash value
- Value
- No cash value
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 123.92K
- % company
- 0.03%
- Price
- $519.74
- Value
- $64,408,780
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 124.19K
- % company
- 0.03%
- Price
- $519.13
- Value
- $64,470,236
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 124.70K
- % company
- 0.03%
- Price
- $517.83
- Value
- $64,575,990
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 124.81K
- % company
- 0.03%
- Price
- $516.73
- Value
- $64,493,588
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 125.01K
- % company
- 0.03%
- Price
- $515.64
- Value
- $64,461,188
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 125.36K
- % company
- 0.03%
- Price
- $514.71
- Value
- $64,524,046
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 125.93K
- % company
- 0.03%
- Price
- $513.71
- Value
- $64,691,500
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.06K
- % company
- 0.03%
- Price
- $512.73
- Value
- $65,149,012
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.47K
- % company
- 0.03%
- Price
- $511.78
- Value
- $65,238,644
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.69K
- % company
- 0.03%
- Price
- $509.66
- Value
- $65,077,466
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.79K
- % company
- 0.03%
- Price
- $507.54
- Value
- $64,857,014
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.84K
- % company
- 0.03%
- Price
- $505.76
- Value
- $64,658,887
Filed Mar 5, 2026
CASPER MARC N
- Shares
- 127.91K
- % company
- 0.03%
- Price
- $503.66
- Value
- $64,420,632
Filed Mar 5, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | Keith R. Alexandra | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 2.60K | No cash value | No cash value | May 20, 2026 |
| 2 | WEISLER DION J | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 5.45K | No cash value | No cash value | May 20, 2026 |
| 3 | WEISLER DION J | <0.01% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 4.95K | $451.79 | $2,235,005 | May 20, 2026 |
| 4 | Spar Debora L | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 2.61K | No cash value | No cash value | May 20, 2026 |
| 5 | Jacks Tyler | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 9.46K | No cash value | No cash value | May 20, 2026 |
| 6 | CHANDY RUBY R | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 3.46K | No cash value | No cash value | May 20, 2026 |
| 7 | Lynch Karen S | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 1.16K | No cash value | No cash value | May 20, 2026 |
| 8 | Chai Nelson | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 15.32K | No cash value | No cash value | May 20, 2026 |
| 9 | HARRIS C MARTIN | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 9.53K | No cash value | No cash value | May 20, 2026 |
| 10 | SPERLING SCOTT M | 0.02% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 69.48K | No cash value | No cash value | May 20, 2026 |
| 11 | JOHNSON JENNIFER M | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 1.40K | No cash value | No cash value | May 20, 2026 |
| 12 | Pettiti Gianluca | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 25.05K | $462.66 | $11,590,096 | Apr 27, 2026 |
| 13 | Keith R. Alexandra | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 1.27K | No cash value | No cash value | Mar 28, 2026 |
| 14 | WEISLER DION J | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 2.72K | No cash value | No cash value | Mar 28, 2026 |
| 15 | Lynch Karen S | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 291 | No cash value | No cash value | Mar 28, 2026 |
| 16 | SPERLING SCOTT M | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 17.59K | No cash value | No cash value | Mar 28, 2026 |
| 17 | JOHNSON JENNIFER M | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 661 | No cash value | No cash value | Mar 28, 2026 |
| 18 | Shafer Michael D | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 20.95K | $499.40 | $10,462,430 | Mar 11, 2026 |
| 19 | CASPER MARC N | 0.01% | Option exerciseDerivative exercise or conversion before any separate sale row. | 40.55K | No cash value | No cash value | Mar 5, 2026 |
| 20 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 123.92K | $519.74 | $64,408,780 | Mar 5, 2026 |
| 21 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 124.19K | $519.13 | $64,470,236 | Mar 5, 2026 |
| 22 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 124.70K | $517.83 | $64,575,990 | Mar 5, 2026 |
| 23 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 124.81K | $516.73 | $64,493,588 | Mar 5, 2026 |
| 24 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 125.01K | $515.64 | $64,461,188 | Mar 5, 2026 |
| 25 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 125.36K | $514.71 | $64,524,046 | Mar 5, 2026 |
| 26 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 125.93K | $513.71 | $64,691,500 | Mar 5, 2026 |
| 27 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.06K | $512.73 | $65,149,012 | Mar 5, 2026 |
| 28 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.47K | $511.78 | $65,238,644 | Mar 5, 2026 |
| 29 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.69K | $509.66 | $65,077,466 | Mar 5, 2026 |
| 30 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.79K | $507.54 | $64,857,014 | Mar 5, 2026 |
| 31 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.84K | $505.76 | $64,658,887 | Mar 5, 2026 |
| 32 | CASPER MARC N | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 127.91K | $503.66 | $64,420,632 | Mar 5, 2026 |
Showing 32 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest TMO shareholders?
Thermo Fisher Scientific Inc (TMO) institutional holders are ranked by reported share count when ownership data publishes filing rows.
What is institutional ownership of TMO?
Thermo Fisher Scientific Inc (TMO) institutional ownership appears when filing-based market data returns holder rows. TECHi does not fill unavailable ownership fields with placeholder shareholders.
Where can I see Thermo Fisher Scientific Inc insider transactions?
Thermo Fisher Scientific Inc (TMO) has 120 Form 4 insider transactions on file, most recently on May 20, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are TMO insiders buying or selling?
Recent TMO insider activity reads Net selling: 41 sales and 0 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active TMO insider?
CASPER MARC N is the most active TMO insider by absolute share movement, with 5.21 million shares moving across the filing history. Review the action labels before treating that activity as buying or selling.