Guidewire Software Officer Files Form 144 to Sell $999K in Common Stock

Executive Summary

On October 20, 2026, Guidewire Software, Inc. officer John P Mullen submitted a Form 144 notice disclosing an intention to sell 5,400 shares of common stock with an aggregate market value of $999,000.00 (approximately $185.00 per share) through Morgan Stanley Smith Barney LLC.

Transaction Details

• Securities to be Sold: 5,400 common shares consisting of:
  • 3,600 shares acquired via Restricted Stock vesting on September 15, 2026.
  • 1,800 shares acquired via Performance Shares vesting on September 15, 2025.
• Plan Adoption: The sales are being conducted under a pre-established Rule 10b5-1 trading plan adopted on January 13, 2026.
• Recent Prior Dispositions (Past 3 Months):
  • September 17, 2026: 39,683 shares sold for gross proceeds of $5,733,076.76.
  • August 25, 2026: 1,800 shares sold for gross proceeds of $339,228.00.
  • August 19, 2026: 16,200 shares sold for gross proceeds of $2,997,000.00.

Market Impact & Significance

The proposed transaction represents less than 0.01% of Guidewire Software's 81,992,669 outstanding shares. Given the relatively small size compared to shares outstanding and the execution under a scheduled Rule 10b5-1 plan established months in advance, this filing carries Low trading significance.