| Delaware | 1-8002 | 04-2209186 |
| (State or other jurisdiction of incorporation) | (Commission File Number) | (I.R.S. Employer Identification No.) |
| ☐ | 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)) |
| 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 | ||
| Floating Rate Senior 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% Senior 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 |
| Item 5.02 | Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. |
| THERMO FISHER SCIENTIFIC INC. | |||
| Date: | January 12, 2026 | By: | /s/ Thomas B. Shropshire |
| Thomas B. Shropshire | |||
| Senior Vice President and General Counsel | |||