This is the public record of open-market stock transactions Tzu-Sou Chuang has reported to the SEC on Form 4 as VP of TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM). Every figure below is the reported share count multiplied by the reported price, so the dollar amounts are exact disclosed values rather than estimates. It is a record of what has been filed, not a portfolio or a recommendation, and insider selling in particular is routine and rarely a signal on its own.
All 8 disclosed transactions, newest filing first.
How many shares has Tzu-Sou Chuang bought and sold?
Tzu-Sou Chuang has disclosed 8 Form 4 transactions in the record we track, from Apr 9, 2026 to Oct 7, 2026: 1 sale worth $13,966,000 and 7 open-market purchases worth $24,427. Each figure is the reported share count multiplied by the reported price, so these are exact disclosed amounts, not estimates.
Is Tzu-Sou Chuang selling a bearish signal?
Not on its own. Insiders sell for many reasons that have nothing to do with a view on the stock — diversification, taxes, estate planning, or a pre-scheduled plan set up months earlier. Of the 1 sales on this record, 0 were made under a Rule 10b5-1 plan and 0 were automatic tax withholding on vesting shares, leaving 1 that were the insider's own discretionary decision (worth $13,966,000). Buying is the cleaner signal, because there is only one reason to buy. This page is a record, not a recommendation.
What is Tzu-Sou Chuang's role?
Tzu-Sou Chuang files as VP of TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM). That role is taken from the Form 4 filings themselves. A Form 4 is filed with the SEC within two business days of an insider buying or selling their own company's stock.
What was Tzu-Sou Chuang's largest single transaction?
The largest single transaction on record is a sell of 200,000 shares of TSM at $69.83, worth $13,966,000, filed May 19, 2026.
How current is this record?
The most recent Form 4 here was filed Oct 8, 2026. Insiders have two business days to file after a trade, so this is close to real time, but it is a record of what has been disclosed, not a statement of what Tzu-Sou Chuang currently holds. Amounts are open-market and plan transactions reported on Form 4; grants and option exercises are not counted as buys.
Source: Form 4 filings submitted to the SEC, the same public documents behind our insider trading tracker. Figures are open-market and plan transactions only; grants and option exercises are not counted as buys. A disclosure is not evidence of a market view, and none of this is investment advice. See the full TSM stock page for price, filings and coverage.