Insider Trading & Ownership of Ernest E. Maddock

Location: North Reading, MA
Summary: The estimated net worth of Ernest E. Maddock is at least $5,978,325 dollars as of 12 May 2026. Ernest E. Maddock is the Director of TERADYNE, INC and owns shares of TERADYNE, INC (TER) stock worth about $3.04M. Ernest E. Maddock is the Director of Ultra Clean Holdings, Inc. and owns shares of Ultra Clean Holdings, Inc. (UCTT) stock worth about $1.08M. Ernest E. Maddock is the Director of AVNET INC and owns shares of AVNET INC (AVT) stock worth about $934.4K. Ernest E. Maddock is the Director of Ouster, Inc. and owns shares of Ouster, Inc. (OUST) stock worth about $920.9K.
Signature: /s/ Ryan E. Driscoll, Attorney-in-Fact
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Quick Takeaways

Ernest E. Maddock has 5 issuer positions tracked on this page.
Estimated disclosed ownership value: $5,978,325.
Recent insider filing activity is available below.

What Changed

Largest disclosed position: TERADYNE, INC ($3,043,161).
Past-year value change for that position: .

Why This Matters

This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
You can cross-check role, issuer, and filing chronology directly against the SEC source.