Teradyne Director Marilyn Matz Files Form 144 Notice to Sell $270K in Common Stock Under 10b5-1 Plan

Executive Summary

On September 15, 2026, Marilyn Matz, a Director of Teradyne, Inc. (TER), filed a Form 144 notice of proposed sale covering 800 shares of common stock with an aggregate market value of approximately $270,264.00 (implying an average price of ~$337.83 per share).

Key Transaction Highlights

• Filer: Marilyn Matz, Director
• Broker: Fidelity Brokerage Services LLC
• Securities Offered: 800 Common Shares
• Estimated Value: $270,264.00
• Date of Acquisition / Nature: Acquired on May 7, 2021, via Restricted Stock Vesting as equity compensation from the Issuer.
• Pre-Arranged Trading Plan: The sale is executed pursuant to a Rule 10b5-1 trading plan adopted on February 13, 2026.

Prior 3-Month Activity

Within the past three months, the insider reported the following completed sales:

• 06/15/2026: 1,200 shares sold for gross proceeds of $507,636.00
• 07/15/2026: 1,200 shares sold for gross proceeds of $427,572.00
• 08/17/2026: 1,200 shares sold for gross proceeds of $510,000.00

Market Impact & Significance

The transaction represents an immaterial fraction of Teradyne's 156.34 million shares outstanding. Given the standard size and execution under a pre-established Rule 10b5-1 trading plan, the market impact is considered Low and reflects routine scheduled insider diversification.