Thermo Fisher (TMO)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2025-12-31 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: THERMO FISHER SCIENTIFIC INC. (TMO) CIK: 0000097745 --- Reporting Owner --- Name: Keith R. Alexandra CIK: 0001710268 Role: Director --- Derivative Transactions --- [Transaction #1] Security: Phantom Stock Units Date: 2025-12-31 | Code: A (Grant or award) Shares: +53.93 Shares Owned After: 1,204.42 | Ownership: D (Direct) Footnotes: [F1] Convertible into Common Stock on a 1-for-1 basis. [F2] Represents stock units credited to the Reporting Person's account as of December 31, 2025, at a price of $579.45 per unit pursuant to the Issuer's Deferred Compensation Plan for Directors (the "Plan"). Directors' retainers are deferred quarterly under the Plan as Common Stock units based on the closing price of the stock as of the quarter end. The shares are distributable as stock upon cessation of director service (for any reason) or a change of control. [F2] Represents stock units credited to the Reporting Person's account as of December 31, 2025, at a price of $579.45 per unit pursuant to the Issuer's Deferred Compensation Plan for Directors (the "Plan"). Directors' retainers are deferred quarterly under the Plan as Common Stock units based on the closing price of the stock as of the quarter end. The shares are distributable as stock upon cessation of director service (for any reason) or a change of control. [F2] Represents stock units credited to the Reporting Person's account as of December 31, 2025, at a price of $579.45 per unit pursuant to the Issuer's Deferred Compensation Plan for Directors (the "Plan"). Directors' retainers are deferred quarterly under the Plan as Common Stock units based on the closing price of the stock as of the quarter end. The shares are distributable as stock upon cessation of director service (for any reason) or a change of control. --- Footnotes (Complete Index) --- F1: Convertible into Common Stock on a 1-for-1 basis. F2: Represents stock units credited to the Reporting Person's account as of December 31, 2025, at a price of $579.45 per unit pursuant to the Issuer's Deferred Compensation Plan for Directors (the "Plan"). Directors' retainers are deferred quarterly under the Plan as Common Stock units based on the closing price of the stock as of the quarter end. The shares are distributable as stock upon cessation of director service (for any reason) or a change of control. --- Signature --- /s/ /s/ Melodie T. Morin, Attorney-in-Fact for R. Alexandra Keith (2026-01-05)