Michael George Rosenbaum, Chief Executive Officer and Director of Guidewire Software, Inc., filed a Form 4 on October 26, 2026, reporting the sale of 1,200 shares of Guidewire common stock under a pre-established 10b5-1 trading plan.

Key Highlights

  • Security sold: 1,200 shares of Guidewire Software common stock disposed of on October 26, 2026
  • Sale price: $187.19 per share
  • Remaining ownership: 273,666 shares of common stock held directly following the transaction
  • Trading plan: The sale was an automatic transaction pursuant to a 10b5-1 Trading Plan adopted by Rosenbaum on October 14, 2025
  • Reporting person role: Rosenbaum is identified as both Director and Chief Executive Officer of Guidewire Software, Inc. (NYSE:GWRE)

Rosenbaum's October 2026 Share Sale Under 10b5-1 Plan

According to the filing, Michael George Rosenbaum disposed of 1,200 shares of Guidewire Software, Inc. common stock on October 26, 2026, at a price of $187.19 per share. The transaction is coded "S" in Table I of the Form 4, indicating a sale. The filing discloses that the transaction was an automatic sale executed pursuant to a 10b5-1 Trading Plan that Rosenbaum adopted on October 14, 2025.

Following the reported transaction, the filing states that Rosenbaum directly holds 273,666 shares of Guidewire common stock. No derivative securities transactions were reported in Table II of the filing. The Form 4 was signed by Winston King as Attorney-in-Fact for Michael George Rosenbaum and filed on October 26, 2026.

The filing indicates the transaction was made pursuant to a contract, instruction, or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c), as noted by the checked box on the form. Guidewire Software, Inc. is listed on the NYSE under the ticker symbol GWRE, with its address at 970 Park Pl, Suite 200, San Mateo, California 94403.

What Was Disclosed

The Form 4 disclosed a single open-market sale of 1,200 shares of Guidewire Software common stock by CEO Michael George Rosenbaum at $187.19 per share on October 26, 2026, executed automatically under a 10b5-1 plan adopted October 14, 2025, leaving him with 273,666 directly held shares.