Thermo Fisher CFO granted 1,534 performance shares

Thermo Fisher Scientific senior vice president and CFO Stephen Williamson reported an acquisition of 1,534 shares of common stock linked to a performance-based restricted stock unit award granted on February 19, 2025.

Rhea-AI Filing Summary

Thermo Fisher Scientific senior vice president and CFO Stephen Williamson reported an acquisition of 1,534 shares of common stock linked to a performance-based restricted stock unit award granted on February 19, 2025. On February 25, 2026, the Compensation Committee certified that the required performance goals were met.

Following this award, Williamson directly owns 33,421.193 shares of common stock. The filing also notes an indirect holding of 12,674 shares held "By SLAT," for which he disclaims beneficial ownership except to the extent of any pecuniary interest.

Insider Trade Summary

Grant/Award: 1,534 shares

Grant/Award 2 txns

Insider Williamson Stephen

Role Sr. VP and CFO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,534	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 33,421.193 shares (Direct); Common Stock — 12,674 shares (Indirect, By SLAT)

Footnotes (2)

1. F1. Shares represent a performance-based restricted stock unit award granted on February 19, 2025. On February 25, 2026, the Compensation Committee certified achievement of the applicable performance criteria. The award vests in three equal tranches on February 28, 2026, 2027 and 2028, in accordance with the terms of the award agreement.
2. F2. The reporting person disclaims beneficial ownership of the securities reported herein as indirectly beneficially owned, except to the extent of any pecuniary interest therein.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Thermo Fisher (TMO) report for CFO Stephen Williamson?

Thermo Fisher (TMO) reported that CFO Stephen Williamson acquired 1,534 shares of common stock tied to a performance-based restricted stock unit award. The award became effective after the Compensation Committee certified achievement of performance criteria on February 25, 2026, triggering the reportable acquisition.

How many Thermo Fisher (TMO) shares does CFO Stephen Williamson own after this Form 4?

After this Form 4, Stephen Williamson directly owns 33,421.193 shares of Thermo Fisher common stock. The filing also shows 12,674 shares held indirectly "By SLAT," for which he disclaims beneficial ownership except for any pecuniary interest he may have in those securities.

What are the terms of the performance-based stock award to Thermo Fisher (TMO) CFO?

The Thermo Fisher CFO’s award is a performance-based restricted stock unit grant made on February 19, 2025. After performance criteria were certified on February 25, 2026, it was set to vest in three equal tranches on February 28 in 2026, 2027, and 2028 under its award agreement.

How is the vesting schedule structured for the Thermo Fisher (TMO) CFO’s RSU award?

The award vests in three equal tranches on February 28, 2026, February 28, 2027, and February 28, 2028. This schedule follows the Compensation Committee’s certification on February 25, 2026 that the applicable performance criteria for the February 19, 2025 grant were achieved.

What does the Thermo Fisher (TMO) Form 4 say about the CFO’s indirect ownership?

The Form 4 lists 12,674 Thermo Fisher shares as indirectly owned "By SLAT." It states the reporting person disclaims beneficial ownership of these indirectly owned securities, except to the extent of any pecuniary interest he may have in them, clarifying limits on his reported ownership.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/27/2026 - 05:13 PM Learn about SEC filing dates

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^*

Williamson Stephen

(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)
	Sr. VP and CFO

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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	02/25/2026		A		1,534(1)	A	$0	33,421.193	D
Common Stock								12,674	I	By SLAT(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. Shares represent a performance-based restricted stock unit award granted on February 19, 2025. On February 25, 2026, the Compensation Committee certified achievement of the applicable performance criteria. The award vests in three equal tranches on February 28, 2026, 2027 and 2028, in accordance with the terms of the award agreement.

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 Stephen Williamson	02/27/2026
	** 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.