UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 22, 2025

THERMO FISHER SCIENTIFIC INC.

(Exact name of Registrant as specified in its Charter)

Delaware

1-8002

04-2209186

(State or other jurisdiction of incorporation)

(Commission File Number)

(I.R.S. Employer Identification No.)

168 Third Avenue

Waltham, Massachusetts 02451

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (781) 622-1000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, $1.00 par value

TMO

New York Stock Exchange

3.200% Notes due 2026

TMO 26B

New York Stock Exchange

1.400% Notes due 2026

TMO 26A

New York Stock Exchange

1.450% Notes due 2027

TMO 27

New York Stock Exchange

1.750% Notes due 2027

TMO 27B

New York Stock Exchange

0.500% Notes due 2028

TMO 28A

New York Stock Exchange

1.375% Notes due 2028

TMO 28

New York Stock Exchange

1.950% Notes due 2029

TMO 29

New York Stock Exchange

0.875% Notes due 2031

TMO 31

New York Stock Exchange

2.375% Notes due 2032

TMO 32

New York Stock Exchange

3.650% Notes due 2034

TMO 34

New York Stock Exchange

2.875% Notes due 2037

TMO 37

New York Stock Exchange

1.500% Notes due 2039

TMO 39

New York Stock Exchange

1.875% Notes due 2049

TMO 49

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

On October 22, 2025, the Registrant announced its financial results for the fiscal quarter ended September 27, 2025. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Form 8-K and incorporated herein by reference.

The information contained in this report and exhibits hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 (the "Exchange Act") or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release dated October 22, 2025

104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


		THERMO FISHER SCIENTIFIC INC.


Date:	October 22, 2025	By:	/s/ Joseph R. Holmes
			Joseph R. Holmes
			Vice President and Chief Accounting Officer

THERMO FISHER SCIENTIFIC INC. 8-K