Bor-Zen Tien is VP at TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM). They have made 15 open-market trades across 1 company since 2026, most recently 2026-10-07.
CIK 0002114023
15 open-market purchases totalling $834K since 2026, never a sale. Across 9 scored buys the stock is up 7.8% at ninety days, and 2.4 points ahead of the S&P over the same stretch.
14 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| TSM | 92 | $38K |
Shares reported on the most recent Form 4, priced at the 2026-10-08 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 71% | 64% | 78% |
| Avg Move | +1.9% | +3.6% | +7.8% |
| Alpha | +0.4% | +1.2% | +2.4% |
| Scored | 14 | 14 | 9 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TSM | BUY | 2026-10-07 | 2026-10-08 | $79.39 | $4K | — | — | — |
| TSM | BUY | 2026-09-07 | 2026-09-09 | $76.20 | $4K | +4.3% | +6.3% | — |
| TSM | BUY | 2026-08-07 | 2026-08-10 | $73.31 | $4K | -1.6% | +2.9% | — |
| TSM | BUY | 2026-08-03 | 2026-08-04 | $73.06 | $73K | +1.9% | -0.4% | — |
| TSM | BUY | 2026-07-28 | 2026-07-30 | $72.73 | $74K | +0.5% | -1.1% | — |
| TSM | BUY | 2026-07-20 | 2026-07-23 | $75.15 | $301K | +1.5% | -0.2% | — |
| TSM | BUY | 2026-07-07 | 2026-07-09 | $76.62 | $4K | -3.1% | -4.4% | +7.8% |
| TSM | BUY | 2026-06-29 | 2026-06-30 | $76.17 | $152K | -9.7% | -13.6% | -3.0% |
| TSM | BUY | 2026-06-05 | 2026-06-09 | $76.01 | $4K | +13.0% | +5.6% | +6.1% |
| TSM | BUY | 2026-05-19 | 2026-05-21 | $395.18 | $7K | +6.9% | +14.3% | +0.8% |
| TSM | BUY | 2026-05-19 | 2026-05-19 | $69.91 | $140K | +9.7% | +16.3% | +8.4% |
| TSM | BUY | 2026-05-08 | 2026-05-11 | $71.82 | $4K | +2.4% | +2.8% | +5.3% |
| TSM | BUY | 2026-04-28 | 2026-04-29 | $387.33 | $6K | +1.7% | +5.3% | -1.4% |
| TSM | BUY | 2026-04-09 | 2026-04-13 | $57.87 | $4K | +1.0% | +5.5% | +11.2% |
| TSM | BUY | 2026-03-22 | 2026-03-24 | $55.93 | $56K | -1.2% | +10.6% | +35.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.