ASX insider buying and SEC filings, explained
ASE Technology Holding Co., Ltd. · CIK 1122411
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$369.7M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 12, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 3,000 shares at $752.00 ($2.3M). Holdings down <1% to 838,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 14, 2026, 6:06 AM ET |
| Jul 22, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 3,000 shares at $665.00 ($2.0M). Holdings down <1% to 751,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 24, 2026 |
| Jul 15, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 3,000 shares at $688.00 ($2.1M). Holdings down <1% to 754,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 17, 2026 |
| Jul 6, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 2,000 shares at $687.00 ($1.4M). Holdings down <1% to 757,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 8, 2026 |
| Jun 30–Jul 1, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 8,000 shares between Jun 30 and Jul 1 at about $686.63 ($5.5M). Holdings down 1% to 759,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 2, 2026 |
| Jun 18–23, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 11,000 shares between Jun 18 and Jun 23 at about $659.91 ($7.3M). Holdings down 1% to 767,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 23, 2026 |
| Jun 1–3, 2026 | Sale | Du-Tsuen Uang (Chief Administration Officer) sold 10,000 shares between Jun 1 and Jun 3 at about $612.00 ($6.1M). Holdings down 1% to 778,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 3, 2026 |
| May 22–27, 2026 | Sale | Jeffrey Chen (Director) sold 29,000 shares indirectly (by spouse) between May 22 and May 27 at about $590.62 ($17.1M). Holdings by spouse down 100% to 0 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 27, 2026 |
| May 19–21, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between May 19 and May 21 at about $488.33 ($13.2M). Holdings by spouse down 48% to 29,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 21, 2026 |
| May 14–18, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between May 14 and May 18 at about $543.00 ($14.7M). Holdings by spouse down 33% to 56,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 18, 2026 |
| Apr 24, 2026 | Sale | Jeffrey Chen (Director) sold 9,000 shares indirectly (by spouse) at $473.00 ($4.3M). Holdings by spouse down 10% to 83,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 28, 2026 |
| Apr 21–23, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between Apr 21 and Apr 23 at about $472.56 ($12.8M). Holdings by spouse down 23% to 92,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 23, 2026 |
| Apr 20, 2026 | Sale | Tien-Szu Chen (GM, ASE Inc. Chung-Li Branch) sold 530,000 shares at about $466.30 ($247.1M). Holdings down 19% to 2,251,821 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 22, 2026 |
| Apr 16–20, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between Apr 16 and Apr 20 at about $453.83 ($12.3M). Holdings by spouse down 18% to 119,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 20, 2026 |
| Apr 13–15, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between Apr 13 and Apr 15 at about $422.44 ($11.4M). Holdings by spouse down 16% to 146,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 15, 2026 |
| Apr 8–10, 2026 | Sale | Jeffrey Chen (Director) sold 27,000 shares indirectly (by spouse) between Apr 8 and Apr 10 at about $385.17 ($10.4M). Holdings by spouse down 14% to 173,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 10, 2026 |
17 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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