TSMC insider activity
What the executives and directors of TSMC actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
The tape: three years of insider trades
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
The chart, in numbers
| Flow | Shares |
|---|---|
| Bought on market | 7,000 |
| Kept | 7,000 |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| Lin Shyue-Shyh | 23K | 26K | 112.9 |
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| Yeap Choh Fei SVP Last trade Mar 22, 2026 | Officer | 213K | $56K | – | net buying over the year: 1 month buying, 0 months selling | Mar 22, 2026 |
| Lin Shyue-Shyh VP Last trade Mar 30, 2026 | Officer | 26K | $275K | – | net buying over the year: 1 month buying, 0 months selling | Mar 30, 2026 |
| Tien Bor-Zen VP Last trade Mar 22, 2026 | Officer | 9,051 | $56K | – | net buying over the year: 1 month buying, 0 months selling | Mar 22, 2026 |
Open-market trade log
| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Mar 30, 2026 | Lin Shyue-Shyh (Officer) 3,000 shares $54.72 +1.9% since trade filed Mar 31, 2026 | Open-market buy | 3,000 | $54.72 | $164K | +1.9% | Mar 31, 2026 |
| Mar 29, 2026 | Lin Shyue-Shyh (Officer) 2,000 shares $55.63 +0.3% since trade filed Mar 30, 2026 | Open-market buy | 2,000 | $55.63 | $111K | +0.3% | Mar 30, 2026 |
| Mar 22, 2026 | Yeap Choh Fei (Officer) 1,000 shares $55.78 +0.0% since trade filed Mar 31, 2026 late | Open-market buy | 1,000 | $55.78 | $56K | +0.0% | Mar 31, 2026 late |
| Mar 22, 2026 | Tien Bor-Zen (Officer) 1,000 shares $55.93 −0.3% since trade filed Mar 24, 2026 | Open-market buy | 1,000 | $55.93 | $56K | −0.3% | Mar 24, 2026 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.