Daily Insider Signal · July 21, 2026
Insider Alert: Tien Bor-Zen Bought TSM Shares (90/100 Signal)
TSM
Bought
1,000
90/100
This filing meets multiple strong signal criteria, scoring 90/100. It is a large open-market purchase by a senior insider with few noise factors, meaning several predefined scoring criteria are satisfied at once. This describes transaction characteristics, not investment merit.
The purchase increased the insider's reported holdings by approximately 50%, a substantial increase in the personal capital tied to the position.
What to watch: Monitor upcoming earnings dates, any subsequent Form 4 amendments, and cluster activity (multiple insiders buying within a 30-day window). Single filings are most informative when corroborated by broader disclosure patterns.
What this signal means
DisclosureSignals scores every SEC Form 4 filing on a 0–100 scale. This trade earned a 90/100 signal score by weighing the transaction type, insider role, trade size, cluster buying, the insider's own history, and whether the trade was discretionary rather than part of a scheduled 10b5-1 plan. A higher score means the transaction meets more of these predefined criteria — it does not indicate investment merit or expected performance. Insiders generally have up to two business days after a transaction to file Form 4, so the transaction date may be earlier than the filing date. Read the full methodology.
See every recent Form 4 filing for TSM, including historical insider trades and trend context.
Transaction Details
- Insider
- Tien Bor-Zen
- Company
- TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD
- Transaction Date
- July 21, 2026
- Price Per Share
- $73.98
- Total Value
- $73,980
- Type
- Purchase
Get Timely Insider Filing Alerts
DisclosureSignals monitors SEC EDGAR every 15 minutes and scores every Form 4 filing. Alerts are notices about newly available public filings — the underlying transaction may have occurred earlier. Not investment advice.
View Free Dashboard →