Bor-Zen Tien insider trades: Taiwan Semiconductor Manufacturing (TSM) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Bor-Zen reports to the SEC
Open-market buys and sales
26 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Oct 7, 2026 | TSM | ↑ Buy | 40 | $79.39 | $3K | By ESPP Trust | Oct 8, 2026 (1d) |
| Oct 7, 2026 | TSM | ↑ Buy | 7 | $79.39 | $556 | By Immediate Family Member | Oct 8, 2026 (1d) |
| Sep 7, 2026 | TSM | ↑ Buy | 43 | $76.20 | $3K | By ESPP Trust | Sep 9, 2026 (2d) |
| Sep 7, 2026 | TSM | ↑ Buy | 5 | $76.20 | $381 | By Immediate Family Member | Sep 9, 2026 (2d) |
| Aug 7, 2026 | TSM | ↑ Buy | 42 | $73.31 | $3K | By ESPP Trust | Aug 10, 2026 (3d) |
| Aug 7, 2026 | TSM | ↑ Buy | 7 | $73.31 | $513 | By Immediate Family Member | Aug 10, 2026 (3d) |
| Aug 3, 2026 | TSM | ↑ Buy | 1,000 | $73.06 | $73K | Direct | Aug 4, 2026 (1d) |
| Jul 28, 2026 | TSM | ↑ Buy | 1,000 | $67.97 | $68K | By Spouse | Jul 30, 2026 (2d) |
| Jul 28, 2026 | TSM | ↑ Buy | 15 | $390.00 | $6K | Direct | Jul 30, 2026 (2d) |
| Jul 21, 2026 | TSM | ↑ Buy | 3,000 | $74.39 | $223K | By Spouse | Jul 23, 2026 (2d) |
| Jul 21, 2026 | TSM | ↑ Buy | 1,000 | $74.13 | $74K | Direct | Jul 23, 2026 (2d) |
| Jul 20, 2026 | TSM | ↑ Buy | 10 | $405.00 | $4K | Direct | Jul 23, 2026 (3d) |
| Jul 7, 2026 | TSM | ↑ Buy | 40 | $76.62 | $3K | By ESPP Trust | Jul 9, 2026 (2d) |
| Jul 7, 2026 | TSM | ↑ Buy | 6 | $76.62 | $460 | By Immediate Family Member | Jul 9, 2026 (2d) |
| Jun 30, 2026 | TSM | ↑ Buy | 1,000 | $75.70 | $76K | By Spouse | Jun 30, 2026 (0d) |
| Jun 29, 2026 | TSM | ↑ Buy | 1,000 | $76.64 | $77K | Direct | Jun 30, 2026 (1d) |
| Jun 5, 2026 | TSM | ↑ Buy | 43 | $76.01 | $3K | By ESPP Trust | Jun 9, 2026 (4d) |
| Jun 5, 2026 | TSM | ↑ Buy | 7 | $76.01 | $532 | By Immediate Family Member | Jun 9, 2026 (4d) |
| May 20, 2026 | TSM | ↑ Buy | 17 | $395.18 | $7K | Direct | May 21, 2026 (1d) |
| May 19, 2026 | TSM | ↑ Buy | 2,000 | $69.91 | $140K | Direct | May 19, 2026 (0d) |
| May 8, 2026 | TSM | ↑ Buy | 44 | $71.82 | $3K | By ESPP Trust | May 11, 2026 (3d) |
| May 8, 2026 | TSM | ↑ Buy | 7 | $71.82 | $503 | By Immediate Family Member | May 11, 2026 (3d) |
| Apr 28, 2026 | TSM | ↑ Buy | 20 | $388.00 | $8K | Direct | Apr 29, 2026 (1d) |
| Apr 9, 2026 | TSM | ↑ Buy | 53 | $57.87 | $3K | By ESPP Trust | Apr 13, 2026 (4d) |
| Apr 9, 2026 | TSM | ↑ Buy | 9 | $57.87 | $521 | By Immediate Family Member | Apr 13, 2026 (4d) |
| Mar 22, 2026 | TSM | ↑ Buy | 1,000 | $55.93 | $56K | Direct | Mar 24, 2026 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other TSM insiders
Open-market trades in the last 12 months
About Bor-Zen Tien's insider trades
Bor-Zen Tien is VP at Taiwan Semiconductor Manufacturing (TSM). Since Mar 22, 2026, Bor-Zen has reported 26 open-market purchases worth $836K and no sales on SEC Form 4. In the last 12 months: 26 buys ($836K).
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every TSM insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.