TSM TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD Insider Trading

TSM VP Chuang Tzu-Sou sold 200,000 shares at $69.83 on 2026-05-19; stock now $395.95, up +6.9% in 30 days.

Chuang Tzu-Sou (VP) sold 200,000 shares (200.0K shares) of TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM) at $69.83, reducing his holdings from 2,695,165 shares (2.70M shares) to 2,495,165 shares (2.50M shares) in the open market. The transaction occurred on 2026-05-19 for a total value of $13,966,000.00 ($14.0M), representing a -7.4% reduction of his pre-transaction stake. Notably, this sale followed his prior buy on 2026-04-09 at the same ticker, which achieved strong 30-day and 90-day returns (+611.4% and +584.2% respectively)—a well-timed entry in his same-ticker history. Since the May sale, TSM has appreciated +6.9% over 30 days and +8.7% over 90 days, meaning the insider sold before a subsequent rally. This outcome differs from his demonstrated cross-ticker track record (100% 90-day win rate on 1 prior buy), suggesting either a tactical position reduction rather than a conviction-driven exit, or market conditions at the time of sale that warranted the reduction despite subsequent upward price action.

TSM VP Tien Bor-Zen bought 2,000 shares for $139,810.00 on 2026-05-19; 5 of 5 prior TSM buys were well-timed at 90-day mark.

Tien Bor-Zen, VP at Taiwan Semiconductor Manufacturing Co Ltd, executed 2 separate purchases totaling 2,000 shares for $139,810.00 at a blended average price of $69.90, increasing holdings by 22.1% to 11,051 shares. His prior trading history at TSM shows a perfect timing pattern: all 5 previous buys at this ticker were well-timed at the 90-day measurement point, with returns ranging from +1.5% to +611.4% over 90 days. This transaction occurs amid a cluster environment where 27 other insiders also bought within the past 14 days. The stock has moved +6.9% over the past 30 days and +8.7% over 90 days, within a 52-week trading range of $187.72–$421.97.

TSM Chairman and CEO Wei Che-Chia purchases 160 shares; part of a 25-insider buying wave in 14 days.

Wei Che-Chia, TSM's Chairman and CEO, purchased shares on the open market while the stock trades near its 52-week high and has gained significantly over the past three months. This purchase is part of a substantial cluster: 25 insiders bought shares within a 14-day window, indicating broad insider activity across the company's leadership. Wei's own prior open-market purchase, made approximately one month earlier, saw the stock rise afterward—a pattern of well-timed buying. As a sitting CEO with direct knowledge of operations, his decision to add shares while the stock remains elevated is noteworthy, though the small transaction size relative to his overall holdings suggests modest conviction rather than a major capital commitment. The cluster of simultaneous buying across the organization provides context beyond this single trade.