Thermo Fisher (NYSE: TMO) CEO reports tax-withholding share transfers

Rhea-AI Filing Summary

Thermo Fisher Scientific Chairman & CEO Marc N. Casper reported two tax-withholding dispositions of common stock on February 28, 2026. He delivered 3,473.759 shares and 1,211.168 shares at $521.11 per share to cover tax liabilities, rather than executing open-market sales. Following these dispositions, he directly held 123,925.358 common shares. Additional common shares are held indirectly by the Alison Casper 2020 Irrevocable Trust, the MNC 2020 Irrevocable Trust, and Floral Park Associates, Inc., for which he disclaims beneficial ownership except to any pecuniary interest.

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

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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^*

CASPER MARC N

(Last) (First) (Middle)

168 THIRD AVENUE

(Street)

WALTHAM MA 02451

(City) (State) (Zip)

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
X	Officer (give title below)		Other (specify below)
	Chairman & CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/28/2026

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

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

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

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	02/28/2026		F		3,473.759	D	$521.11	125,136.526	D
Common Stock	02/28/2026		F		1,211.168	D	$521.11	123,925.358	D
Common Stock								11,300	I	By Alison Casper 2020 Irrevocable Trust(1)
Common Stock								14,608	I	By Floral Park Associates, Inc.
Common Stock								5,000	I	By MNC 2020 Irrevocable Trust(2)

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:

1. The reporting person disclaims beneficial ownership of the securities reported herein as indirectly beneficially owned, except to the extent of any pecuniary interest therein.

2. The reporting person disclaims beneficial ownership of the securities reported herein as indirectly beneficially owned, except to the extent of any pecuniary interest therein.

	/s/ Melodie T. Morin, Attorney-in-Fact for Marc N. Casper	03/02/2026
	** 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).
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FAQ

What insider transaction did Thermo Fisher (TMO) CEO Marc Casper report?

Marc Casper reported two tax-withholding dispositions of Thermo Fisher common stock. He delivered shares to satisfy tax liabilities associated with equity awards, rather than selling shares in open-market transactions, as indicated by Form 4 code F and its description.

How many Thermo Fisher (TMO) shares were disposed of for taxes by the CEO?

Marc Casper delivered 3,473.759 shares and 1,211.168 shares of Thermo Fisher common stock. Both transactions used a price of $521.11 per share for tax-withholding purposes, reflecting shares surrendered to cover tax obligations, not discretionary market sales.

How many Thermo Fisher (TMO) shares does Marc Casper hold directly after these transactions?

After the tax-withholding dispositions, Marc Casper directly held 123,925.358 shares of Thermo Fisher common stock. This figure reflects his remaining direct ownership as reported in the Form 4, following the two code F transactions on February 28, 2026.

What indirect Thermo Fisher (TMO) holdings related to Marc Casper are reported?

Indirect holdings are reported for Alison Casper 2020 Irrevocable Trust, MNC 2020 Irrevocable Trust, and Floral Park Associates, Inc.. The filing states Marc Casper disclaims beneficial ownership of these indirectly owned securities, except to the extent of any pecuniary interest.

Does the Thermo Fisher (TMO) CEO’s Form 4 indicate open-market share sales?

The Form 4 shows tax-withholding dispositions coded F, not open-market sales. Shares were delivered to cover tax liabilities tied to equity compensation, as described by the code F definition, which is distinct from discretionary buying or selling in the market.