tmo-20260324

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): March 24, 2026

THERMO FISHER SCIENTIFIC INC.

(Exact name of Registrant as specified in its Charter)

Delaware

1-8002

04-2209186

(State of incorporation)

(Commission File Number)

(I.R.S. Employer Identification Number)

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

1.450% Notes due 2027

TMO 27

New York Stock Exchange

1.750% Notes due 2027

TMO 27B

New York Stock Exchange

Floating Rate Notes due 2027

TMO 27D

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

3.628% Notes due 2035

TMO 35A

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 8.01 Other Events.

On March 24, 2026, Thermo Fisher Scientific Inc. (“Thermo Fisher”) issued a press release announcing the completion of its acquisition of Clario Holdings, Inc. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release of Thermo Fisher Scientific Inc., dated March 24, 2026

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

SIGNATURE

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:	March 24, 2026	By:	/s/ Thomas B. Shropshire
			Thomas B. Shropshire
			Senior Vice President and General Counsel

Thermo Fisher Scientific Inc filed SEC Form 8-K: Other Events, Financial Statements and Exhibits