Thermo Fisher (TMO) accounting chief reports tax-withholding stock dispositions

Rhea-AI Filing Summary

Thermo Fisher Scientific executive Joseph R. Holmes, VP & Chief Accounting Officer, reported several small dispositions of common stock on February 28, 2026. The transactions used code F, meaning shares were withheld to cover tax liabilities rather than sold in open-market trades. Blocks of stock were withheld at $521.11 per share, including 55.475 and 44.459 shares. After these tax-withholding dispositions, Holmes directly held about 2,966.3555 shares of Thermo Fisher common stock.

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^*

Holmes Joseph R.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP & Chief Accounting Officer

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		12.289	D	$521.11	3,070.6925	D
Common Stock	02/28/2026		F		55.475	D	$521.11	3,015.2175	D
Common Stock	02/28/2026		F		44.459	D	$521.11	2,970.7585	D
Common Stock	02/28/2026		F		4.403	D	$521.11	2,966.3555	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 Joseph R. Holmes	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).
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.

FAQ

What insider transaction did Thermo Fisher (TMO) report for Joseph R. Holmes?

Thermo Fisher reported that Joseph R. Holmes, its VP & Chief Accounting Officer, had common shares withheld on February 28, 2026 to satisfy tax liabilities. These Form 4 transactions used code F, indicating tax-withholding dispositions rather than open-market buying or selling activity.

Was the Thermo Fisher (TMO) insider transaction an open-market sale?

No, the transactions were not open-market sales. They were coded F, which means shares of Thermo Fisher common stock were withheld to pay exercise-price or tax obligations, functioning as tax-withholding dispositions instead of discretionary sales into the market.

How many Thermo Fisher (TMO) shares does Joseph R. Holmes hold after the Form 4?

After the reported tax-withholding transactions, Joseph R. Holmes directly holds 2,966.3555 shares of Thermo Fisher common stock. This figure reflects his remaining direct ownership following the February 28, 2026 dispositions used to cover tax-related obligations.

What price per share was used in the Thermo Fisher (TMO) tax-withholding dispositions?

The tax-withholding dispositions were reported at a price of $521.11 per share. This price was applied to multiple small blocks of Thermo Fisher common stock that were withheld on February 28, 2026 to satisfy Holmes’s tax or exercise-related liabilities.

What does transaction code F mean in the Thermo Fisher (TMO) Form 4 filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering or withholding securities. In this Thermo Fisher filing, it shows that Joseph R. Holmes’s common shares were used to cover tax obligations, not to execute ordinary market sales.