Photronics (PLAB) is a legacy tech company that David Trainer says has gone completely unnoticed by Wall Street for what he considers as a key role in the A.I. space. He points out its photomask development as critical to building chips. As for its financials, David adds that it continues to post solid growth and trades at a cheap P/E compared to peers. While he considers the company an "under the radar" leader, he notes competition as a headwind Photonics will face.