Sean D. Keohane, President and CEO of Cabot Corporation, filed a Form 4 on August 26, 2026, reporting an option exercise and same-day sale of common stock that took place on August 24, 2026.

Key Highlights

  • Option exercised: Keohane exercised an employee stock option (right to buy) for 2,779 shares of common stock at an exercise price of $50.00 per share on August 24, 2026.
  • Shares sold: 2,779 shares of common stock were disposed of on August 24, 2026, at a price of $85.50 per share.
  • Direct ownership following transactions: Keohane directly holds 288,873 shares of common stock after the reported transactions.
  • Indirect ownership: An additional 14,263.7411 shares are held indirectly through the trustee for Cabot Corporation's 401(k) Plan.
  • Remaining options: 134,895 derivative securities (employee stock options) remain beneficially owned directly, with an expiration date of November 8, 2028.
  • Option background: The original option covered 137,674 shares and vested 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020.

Cabot Corp President and CEO Reports Option Exercise and Same-Day Stock Sale

According to the filing, Sean D. Keohane, serving as both a Director and President and CEO of Cabot Corporation (NYSE:CBT), reported two transactions in the company's common stock on August 24, 2026. The filing was signed on August 26, 2026, by Mazda Cintron pursuant to a power of attorney from Keohane.

The first transaction was coded "M," indicating the exercise of an employee stock option. Keohane acquired 2,779 shares of common stock at a conversion price of $50.00 per share. Immediately following the exercise, his direct beneficial ownership stood at 291,652 shares, the filing disclosed. The second transaction, coded "S," involved the disposal of 2,779 shares at $85.50 per share, reducing his direct holdings to 288,873 shares.

The filing notes that the option exercised carried an expiration date of November 8, 2028, and originally covered 137,674 shares in total. Per the filing's explanation of responses, the option vested in three installments: 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020. Following these transactions, Keohane retains 134,895 employee stock options (right to buy) with a $50.00 exercise price, held directly.

What Was Disclosed

The filing reports a same-day option exercise and sale of 2,779 shares of Cabot Corporation common stock by President and CEO Sean D. Keohane on August 24, 2026, resulting in direct ownership of 288,873 shares and indirect ownership of 14,263.7411 shares via the company's 401(k) Plan.