Thermo Fisher (TMO) director gets 499-share award, 80 withheld for tax

Rhea-AI Filing Summary

Thermo Fisher Scientific director Dion J. Weisler received a grant of 499 shares of Common Stock, increasing his direct holdings. On the same date, 80.287 shares were withheld at $451.79 per share to satisfy tax obligations related to this award, leaving him with 4,947.384 directly held shares.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider WEISLER DION J

Role null

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	80.287	$451.79	$36K
Grant/Award	Common Stock	499	$0.00	--

Holdings After Transaction: Common Stock — 4,947.384 shares (Direct, null)

Footnotes (1)

Key Figures

Share grant: 499 shares Tax-withheld shares: 80.287 shares Tax-withholding price: $451.79 per share +2 more

5 metrics

Share grant 499 shares Common Stock award on May 20, 2026

Tax-withheld shares 80.287 shares Withheld to cover taxes on May 20, 2026

Tax-withholding price $451.79 per share Value used for tax-withholding disposition

Holdings after grant 5,446.384 shares Direct holdings after 499-share grant

Final direct holdings 4,947.384 shares Direct Common Stock after tax withholding

Key Terms

Grant, award, or other acquisition, tax-withholding disposition, Payment of exercise price or tax liability by delivering securities, Common Stock

4 terms

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

tax-withholding disposition financial

"transaction_action: tax-withholding disposition"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Payment of exercise price or tax liability by delivering securities financial

"transaction_code_description: Payment of exercise price or tax liability by delivering securities"

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

WEISLER DION J

(Last) (First) (Middle)

168 THIRD AVENUE

(Street)

WALTHAM MASSACHUSETTS 02451

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
THERMO FISHER SCIENTIFIC INC. [ TMO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/20/2026		F		80.287	D	$451.79	4,947.384	D
Common Stock	05/20/2026		A		499	A	$0	5,446.384	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Melodie T. Morin, Attorney-in-Fact for Dion J. Weisler	05/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Thermo Fisher (TMO) director Dion J. Weisler report?

Dion J. Weisler reported receiving a grant of 499 shares of Thermo Fisher Common Stock. The filing also shows a related tax-withholding disposition, where a portion of the shares was surrendered to cover tax obligations tied to this equity award.

How many Thermo Fisher (TMO) shares were granted to Dion J. Weisler?

He was granted 499 shares of Thermo Fisher Common Stock at a reported price of $0.00 per share. This reflects a compensation-related equity award rather than an open-market purchase, increasing his direct ownership before tax withholding adjustments.

Why were 80.287 Thermo Fisher (TMO) shares disposed of in this Form 4?

The 80.287 shares were disposed of as a tax-withholding transaction at $451.79 per share. This means shares were surrendered to satisfy tax liabilities arising from the share grant, not sold in an open-market trade to third-party buyers.

What are Dion J. Weisler’s Thermo Fisher (TMO) holdings after these transactions?

After the grant and related tax withholding, Dion J. Weisler holds 4,947.384 Thermo Fisher Common Stock shares directly. This figure reflects his updated direct ownership position as reported in the Form 4 following the May 20, 2026 equity award.

Does the Thermo Fisher (TMO) Form 4 show any open-market stock purchases or sales?

The Form 4 shows a share grant and a tax-withholding disposition, but no open-market purchases or sales. The grant increased Dion J. Weisler’s holdings, while the tax withholding reduced them slightly to cover tax obligations from the equity award.