Lee John Tseng-Chung, President & CEO of at least two publicly traded companies, has demonstrated a consistent pattern of selling activity across his holdings in MKS Instruments (MKSI) and Cognex (CGNX), with no recorded purchases in the available data. His 24 reported transactions since 2024 show a total sell value of $16.48 million, all concentrated in MKSI shares. Notably, his most significant disposals occurred in February 2026, with four sales on February 20 alone totaling $7.72 million—including a single transaction valued at $3.29 million and another at $3.41 million. These followed an earlier $8.49 million sale on February 17, 2026, classified as a derivative transaction (Code F). The only other sale in the dataset, dated October 31, 2025, was substantially smaller at $287,851.
While Tseng-Chung’s filings for Cognex (CGNX) appear frequently, they reflect non-monetary transactions—likely awards, exercises, or holdings adjustments (Codes A and M)—with no associated buy or sell value. The absence of any purchase activity across both companies suggests a clear divestment trend, particularly in MKSI, where his sales have accelerated in early 2026. The timing of these disposals, clustered within days of each other, may reflect planned liquidity events, though the filings provide no context beyond the transactional facts. His activity in CGNX remains administrative, with no market transactions reported.
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