[Form 4] Thermo Fisher Scientific, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Thermo Fisher (TMO) Form 4 — insider dispositions by Sr. VP & CFO Stephen Williamson. The filing reports four open-market sales on 08/28/2025 totaling 783.273 shares at $489.74 per share. After these transactions, Williamson directly held 32,320.193 shares and is noted as indirectly beneficially owning 12,674 shares through a SLAT, with a disclaimer that he disclaims beneficial ownership except for any pecuniary interest. The form is signed by an attorney-in-fact on 09/02/2025.

Positive

• None.

Negative

• Insider dispositions: Four sales totaling 783.273 shares on 08/28/2025 at $489.74 per share.
• Reduction in direct holdings: Direct holdings reported decreased to 32,320.193 shares after the transactions.

Insights

Financial Analyst

TL;DR: CFO sold 783.273 shares at $489.74, reducing direct holdings modestly; transaction size appears routine for an executive.

The filing documents four separate dispositions on a single date totaling 783.273 shares at $489.74 each. Proceeds can be computed from these explicit amounts; the transactions reduced the reporting person’s direct holdings from 32,888.792 to 32,320.193 shares as shown. No option exercises, grants, or derivative transactions are reported. This is a clear disclosure of insider selling without additional context about purpose or a 10b5-1 plan on the face of the form.

Corporate Governance Expert

TL;DR: Multiple same-day dispositions by the CFO warrant governance attention but are disclosed per Section 16 requirements.

The report meets Section 16 disclosure standards by listing each disposition and the post-transaction beneficial ownership, and it includes the required signature by an attorney-in-fact. The filing also includes an explicit disclaimer of indirect beneficial ownership and identifies the SLAT holding 12,674 shares. Absent additional information (e.g., a stated 10b5-1 plan), governance teams may note timing but cannot infer intent solely from this disclosure.

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)
08/28/2025

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	08/28/2025		F		214.674	D	$489.74	32,888.792	D
Common Stock	08/28/2025		F		219.51	D	$489.74	32,669.282	D
Common Stock	08/28/2025		F		237.883	D	$489.74	32,431.399	D
Common Stock	08/28/2025		F		111.206	D	$489.74	32,320.193	D
Common Stock								12,674	I	By SLAT(1)

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.

	/s/ Melodie T. Morin, Attorney-in-Fact for Stephen Williamson	09/02/2025
	** 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 transactions were reported for Thermo Fisher (TMO)?

The Form 4 reports four dispositions by Sr. VP & CFO Stephen Williamson on 08/28/2025 totaling 783.273 shares at $489.74 per share.

How many shares does Stephen Williamson own after these transactions?

The filing shows 32,320.193 shares directly owned following the reported sales and 12,674 shares indirectly owned via a SLAT.

Was a 10b5-1 trading plan disclosed on the Form 4?

The form does not indicate that these transactions were executed pursuant to a 10b5-1 plan; no plan box or instruction is checked in the provided content.

Who signed the Form 4?

The Form 4 is signed by Melodie T. Morin, Attorney-in-Fact for Stephen Williamson on 09/02/2025.