Marc N. Casper, Chairman and Chief Executive Officer of Thermo Fisher Scientific Inc. (NYSE:TMO), filed a Form 4 on September 1, 2026, reporting two disposals of common stock on August 28, 2026, via tax withholding transactions coded "F."

Key Highlights

  • First disposal: 724.766 shares of common stock disposed of at $622.18 per share on August 28, 2026.
  • Second disposal: 531.851 shares of common stock disposed of at $622.18 per share on August 28, 2026.
  • Post-transaction direct holdings: 122,668.741 shares of common stock held directly following both transactions.
  • Indirect holdings: 11,300 shares held by the Alison Casper 2020 Irrevocable Trust and 5,000 shares held by the MNC 2020 Irrevocable Trust, with beneficial ownership of both disclaimed except to the extent of any pecuniary interest.
  • Transaction code: Both disposals were coded "F," indicating shares withheld to cover tax obligations.

Casper Reports Two Tax-Withholding Disposals of Thermo Fisher Common Stock

According to the filing, Marc N. Casper, serving as Chairman and Chief Executive Officer of Thermo Fisher Scientific Inc., disposed of shares of common stock on August 28, 2026, in two separate transactions, both coded "F" under SEC instructions. Transaction code "F" denotes payment of an exercise price or tax liability by delivering or withholding securities. The filing does not describe any open-market sale.

The first transaction involved the disposal of 724.766 shares at a price of $622.18, reducing Casper's direct holdings to 123,200.592 shares. The second transaction disposed of an additional 531.851 shares at the same price of $622.18, bringing his directly held shares to 122,668.741 following both reported transactions, according to the filing.

In addition to his direct holdings, the filing reports that Casper indirectly holds 11,300 shares through the Alison Casper 2020 Irrevocable Trust and 5,000 shares through the MNC 2020 Irrevocable Trust. The filing notes that "the reporting person disclaims beneficial ownership of the securities reported herein as indirectly beneficially owned, except to the extent of any pecuniary interest therein." No derivative securities were reported in Table II of the filing. The form was signed by Melodie T. Morin as Attorney-in-Fact for Marc N. Casper and filed on September 1, 2026.

What Was Disclosed

The filing reported two "F"-coded disposals of Thermo Fisher Scientific common stock by Chairman and CEO Marc N. Casper on August 28, 2026, both at $622.18 per share, resulting in direct beneficial ownership of 122,668.741 shares, plus indirect holdings via two irrevocable trusts.