Summary
Updated Aug 31, 2026
Tzu-Sou Chuang is VP of TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM). 7 SEC Form 4 filings on record, most recently on 10 August 2026. Most recent open-market trade: bought $3K of TSM on 10 August 2026. Lifetime open-market purchases: $17K. Lifetime open-market sales: $13.97M.
Recent Transactions
8Every recent SEC Form 4 transaction Tzu-Sou Chuang has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Tzu-Sou Chuang go back to 2026: 7 primary Form 4 filings, an average of 7.0 per year. The typical open-market purchase is $3K (5 buys totaling $17K). The largest single buy on record is $3K of TSM in 2026. Sales side: 1 recorded sale totaling $13.97M, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Tzu-Sou Chuang files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Bor-Zen Tien - $829K of TSM open-market activity in the last 12 months
- Shyue-Shyh Lin - $655K of TSM open-market activity in the last 12 months
- Lipen Yuan - $344K of TSM open-market activity in the last 12 months
- Ursula M. Burns - $322K of TSM open-market activity in the last 12 months
- Choh Fei Yeap - $76K of TSM open-market activity in the last 12 months
- Che-Chia Wei - $56K of TSM open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Tzu-Sou Chuang?
Tzu-Sou Chuang is a corporate insider, tracked as VP of TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM). InsiderAlpha holds 7 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Tzu-Sou Chuang submitted recently?
4 primary Form 4 filings in the last 90 days, covering 1 company.
Has Tzu-Sou Chuang been buying or selling stock?
Recorded transactions: 5 open-market purchases ($17K) and 1 open-market sale ($13.97M) across all tracked filings.
Where can I see all of Tzu-Sou Chuang's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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