Richardson Electronics, Ltd.
A distributor and maker of electron tubes, RF and microwave components, and engineered solutions used in healthcare imaging, aviation, broadcast, and industrial equipment. Founded in 1947 by Edward J. Richardson, the Illinois-based company grew from a small tube distributor into a global supplier, taking its name from its founder. Its power grid tubes help keep radar systems, medical imaging machines, and broadcast transmitters running worldwide.
Estimated from filings — the split-adjusted price range over the quarters each manager built the position. A range, not a fill price; 13F reports a quarter-end snapshot, not a trade date.