Sean D. Keohane, President and CEO of Cabot Corporation, filed a Form 4 on August 31, 2026, reporting the exercise of employee stock options and a same-day sale of 134,895 shares of common stock on August 28, 2026.

Key Highlights

  • Option exercise: Keohane acquired 134,895 shares via an employee stock option (transaction code M) at an exercise price of $50 per share on August 28, 2026.
  • Same-day sale: Keohane disposed of 134,895 shares (transaction code S) at $85 per share on August 28, 2026.
  • Remaining direct ownership: Following the transactions, Keohane directly held 404,134 shares of common stock.
  • Indirect holdings: Keohane also holds 14,263.7411 shares indirectly through the trustee for the Corporation's 401(k) Plan.
  • Option fully exercised: The exercised option, originally covering 137,674 shares, now shows 0 derivative securities beneficially owned following the reported transaction.
  • Option vesting history: According to the filing, the option vested 30% on November 9, 2019, 30% on November 9, 2020, and 40% on November 9, 2021, with an expiration date of November 8, 2028.

Keohane Option Exercise and Share Sale Details at Cabot Corporation

According to the filing, Sean D. Keohane, who serves as both a Director and as President and CEO of Cabot Corporation (NYSE:CBT), executed two transactions on August 28, 2026. He first acquired 134,895 shares of common stock through the exercise of an employee stock option at a conversion price of $50 per share, bringing his direct beneficial ownership to 539,029 shares at that point in the sequence.

The filing then reports a disposal of 134,895 shares at $85 per share on the same date, reducing his direct beneficial ownership to 404,134 shares. The underlying employee stock option originally covered 137,674 shares, per the filing's explanation of responses. Following the exercise, the filing indicates 0 derivative securities remain beneficially owned by Keohane in connection with that option, which carried an expiration date of November 8, 2028.

In addition to the directly held shares, the filing discloses that Keohane holds 14,263.7411 shares indirectly through the trustee for the Corporation's 401(k) Plan. The Form 4 was signed by Jennifer M. Lombardi pursuant to a power of attorney from Sean D. Keohane and was filed on August 31, 2026.

What Was Disclosed

The filing discloses the exercise of a $50-strike employee stock option for 134,895 shares and a same-day sale of those shares at $85, leaving Keohane with 404,134 directly held shares and 14,263.7411 shares held indirectly through the company's 401(k) Plan trustee.