AI Semiconductor Test Company Director Sells Portion of Shares Worth Hundreds of Millions

Mercedes Johnson, a director at Teradyne, Inc. (NYSE: TER), sold 625 shares of the company’s common stock on April 6 at an average price of $312.20 per share, generating roughly $195,000 (approximately KRW 260 million) in cash. The sale was made under a pre-established Rule 10b5-1 trading plan set up in February 2025.
Regan Mills, president of Teradyne’s Product Test division, used some shares on April 1 to cover withholding taxes upon RSU vesting and, under his own 10b5-1 plan, sold additional shares valued at about $73,000 (about KRW 100 million) on April 2. Filings show he still holds equity worth several million dollars (several billion KRW).
Non-employee director Peter Herweck converted a portion of his cash compensation into deferred stock units on March 26, a standard compensation deferral transaction rather than a discretionary open-market sale.

Teradyne recently announced a joint venture with MultiLane, a high-speed interconnect testing specialist, to enhance AI data-center testing solutions, with the deal expected to close in the first half of 2026. It also revealed plans to acquire Quantifi Photonics, a photonics test-equipment provider, further expanding its semiconductor and data-center test-equipment portfolio.

Headquartered in North Reading, Massachusetts, Teradyne is a leading supplier of automated test equipment for semiconductors, electronic systems and wireless devices, as well as collaborative robots and other industrial automation solutions. A constituent of the Russell 1000 Index, Teradyne’s core business focuses on supplying test systems for advanced semiconductors—particularly AI chips—to major global IDMs, fabless companies, foundries and OSATs.