Thermo Fisher (NYSE: TMO) COO disposes shares to cover tax obligations

Rhea-AI Filing Summary

Thermo Fisher Scientific President & COO Gianluca Pettiti reported two tax-withholding dispositions of common stock under a Form 4. On February 28, 2026, he surrendered 741.7100 and 331.6810 shares at $521.11 per share to cover tax obligations, and directly owned 25,450.8320 shares afterward.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Pettiti Gianluca

Role President & COO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	741.71	$521.11	$387K
Tax Withholding	Common Stock	331.681	$521.11	$173K

Holdings After Transaction: Common Stock — 25,782.513 shares (Direct)

Footnotes (1)

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^*

Pettiti Gianluca

(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)
	President & COO

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		741.71	D	$521.11	25,782.513	D
Common Stock	02/28/2026		F		331.681	D	$521.11	25,450.832	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 Gianluca Pettiti	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 did Thermo Fisher (TMO) executive Gianluca Pettiti report on this Form 4?

Gianluca Pettiti reported two tax-withholding dispositions of Thermo Fisher common stock. These transactions used shares to satisfy tax obligations related to equity awards rather than representing open-market purchases or sales of new shares.

Was Gianluca Pettiti buying or selling Thermo Fisher (TMO) stock?

The transactions were dispositions for tax withholding, not open-market buys or sells. Code F indicates shares were delivered to cover tax liabilities or exercise costs tied to equity compensation awards, which is a common administrative transaction type.

How many Thermo Fisher (TMO) shares were involved in Pettiti’s tax-withholding transactions?

Pettiti delivered 741.7100 shares and 331.6810 shares of Thermo Fisher common stock. Both transactions used a price of $521.11 per share for calculating the tax-withholding value associated with his equity compensation.

How many Thermo Fisher (TMO) shares does Gianluca Pettiti hold after these transactions?

After the reported tax-withholding dispositions, Gianluca Pettiti directly holds 25,450.8320 shares of Thermo Fisher common stock. This figure reflects his direct ownership position immediately following the second Form 4 transaction reported for February 28, 2026.

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

Transaction code F means shares were used to pay an exercise price or satisfy tax liabilities. In this case, Pettiti’s dispositions were labeled as “tax-withholding” events, indicating they were administrative equity award settlements, not discretionary market trades.