SEC Form 4
ASE Technology Holding Co., Ltd. (ASX) insider trading
In the 12 months to Oct 26, 2026, 3 ASX insiders reported open-market sales of $369.7M across 16 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $369.7M
- 16 filings · 3 insiders
- Open-market purchases
- $0
- 0 filings
Who traded ASX, and when
- Sale
ASX daily close from Oct 27, 2025 to Oct 26, 2026, between $13.23 and $47.60, last $40.13. 16 sale and 0 purchase filings by 3 insiders, marked at their filing dates. Tien-Szu Chen, GM, ASE Inc. Chung-Li Branch: sold $247.1M across 1 filing, first filed Apr 22, 2026, last Apr 22, 2026. Jeffrey Chen, Director: sold $96.0M across 8 filings, first filed Apr 10, 2026, last May 27, 2026. Du-Tsuen Uang, Chief Administration Officer: sold $26.6M across 7 filings, first filed Jun 3, 2026, last Oct 14, 2026.
Largest mark · tap a row for others
Tien-Szu Chen · GM, ASE Inc. Chung-Li Branch
Sale $247,136,998
530,000 shares
Filed Apr 22, 2026 · traded Apr 20
Close on filing date $29.95
Tien-Szu Chen · GM, ASE Inc. Chung-Li Branch
GM, ASE Inc. Chung-Li Branch
$247.1M soldJeffrey Chen · Director
Director
$96.0M soldDu-Tsuen Uang · Chief Administration Officer
Chief Administration Officer
$26.6M soldOpen-market trades
16 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Tien-Szu Chen | GM, ASE Inc. Chung-Li Branch | $247.1M | — | 1 | — | |
| Jeffrey Chen | Director | $96.0M | — | 8 | — | |
| Du-Tsuen Uang | Chief Administration Officer | $26.6M | — | 7 | — |
| Filed | Insider | Type | Shares | Value | Held after | Source |
|---|---|---|---|---|---|---|
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 3,000 ordinary shares | $2.3M | 838,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 3,000 ordinary shares | $2.0M | 751,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 3,000 ordinary shares | $2.1M | 754,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 2,000 ordinary shares | $1.4M | 757,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 8,000 ordinary shares | $5.5M | 759,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 11,000 ordinary shares | $7.3M | 767,000 | |
traded | Du-Tsuen Uang Chief Administration Officer | Sale | 10,000 ordinary shares | $6.1M | 778,000 | |
traded | Jeffrey Chen Director | Sale | 29,000 ordinary shares | $17.1M | 0 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $13.2M | 29,000 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $14.7M | 56,000 | |
traded | Jeffrey Chen Director | Sale | 9,000 ordinary shares | $4.3M | 83,000 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $12.8M | 92,000 | |
traded | Tien-Szu Chen GM, ASE Inc. Chung-Li Branch | Sale | 530,000 ordinary shares | $247.1M | 2,331,821 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $12.3M | 119,000 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $11.4M | 146,000 | |
traded | Jeffrey Chen Director | Sale | 27,000 ordinary shares | $10.4M | 173,000 |
Shares are as filed (ordinary shares or ADS); values are as converted to US$ in the filing.
GET /stocks/filings/vX/form-4?tickers=ASX&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"ASX"
],
"issuer_cik": "0001122411",
"owner_cik": "0002118034",
"accession_number": "0000950103-26-015546",
"form_type": "4",
"filing_date": "2026-10-14",
"period_of_report": "2026-10-12",
"issuer_name": "ASE Technology Holding Co., Ltd.",
"issuer_trading_symbol": "ASX",
"owner_name": "Uang Du-Tsuen",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Administration Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-10-12",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3000,
"transaction_price_per_share": 752,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 838000,
"transaction_value": 2256000,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "New Taiwan Dollars."
}
]
},
{
"tickers": [
"ASX"
],
"issuer_cik": "0001122411",
"owner_cik": "0002118034",
"accession_number": "0000950103-26-011125",
"form_type": "4",
"filing_date": "2026-07-24",
"period_of_report": "2026-07-22",
"issuer_name": "ASE Technology Holding Co., Ltd.",
"issuer_trading_symbol": "ASX",
"owner_name": "Uang Du-Tsuen",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Administration Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-07-22",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3000,
"transaction_price_per_share": 665,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 751000,
"transaction_value": 1995000,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "New Taiwan Dollars."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 23 records
- Option exercises9 records
- Grants and awards12 records
- Gifts2 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has ASE Technology Holding Co., Ltd.'s CEO sold stock?
No. Kenneth Hsiang (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is ASX’s insider data?
These are ASX Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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