BetaInsiders sold $367M in the past 12 months.0% was sold under disclosed trading plans, 100% with no plan disclosed. The largest seller, Tien-Szu Chen (GM, ASE Inc. Chung-Li Branch), sold $247M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 3 officers and directors who sold. 17 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Chien Chang, Hung Chang, Chi-Wen Tsai, Tien-Yue Wu, Hung-Szu Tung, Raymond Lo, Tien-Szu Chen, Jeffrey Chen, Hung-Ming Kuo, Du-Tsuen Uang, Chen-Yen Wei, Meng-Hui Lin, Andrew Tang, Chung Lin, Kenneth Hsiang, Chih-Hsiao Chung and Shen-Fu Yu (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
No officer or director trades were reported for the past 30 days. The most recent before that:
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Du-Tsuen Uang Chief Administration Officer | 3,000 | $665.00 | n/a | n/a | Jul 22, 2026 | Jul 24, 2026 |
No. Kenneth Hsiang reported no open-market sales in the past 12 months.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 0% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 100% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Tien-Szu Chen GM, ASE Inc. Chung-Li Branch | $247M 530K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Jeffrey Chen Director | $96.0M 200K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Du-Tsuen Uang Chief Administration Officer | $24.3M 37K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 13, 2025 | Sold | Held Oct 13, 2026 | Still held | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chien Chang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chien Chang are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Chien ChangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chien Chang are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Hung Chang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Hung Chang are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Hung ChangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Hung Chang are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Chi-Wen Tsai!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chi-Wen Tsai are complete. Chairman & President, SPIL | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Chi-Wen TsaiHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chi-Wen Tsai are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Tien-Yue Wu!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Tien-Yue Wu are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Tien-Yue WuHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tien-Yue Wu are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Hung-Szu Tung!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Hung-Szu Tung are complete. Chief Financial Officer | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Hung-Szu TungHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Hung-Szu Tung are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Raymond Lo!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Raymond Lo are complete. GM TW & Kaohsiung Pkg Facility | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Raymond LoHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Raymond Lo are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Tien-Szu Chen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Tien-Szu Chen are complete. GM, ASE Inc. Chung-Li Branch | n/a | −530K | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Tien-Szu ChenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tien-Szu Chen are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Jeffrey Chen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jeffrey Chen are complete. Director | n/a | −200K | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Jeffrey ChenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jeffrey Chen are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Hung-Ming Kuo!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Hung-Ming Kuo are complete. Principal Accounting Officer | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Hung-Ming KuoHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Hung-Ming Kuo are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Du-Tsuen Uang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Du-Tsuen Uang are complete. Chief Administration Officer | n/a | −37K | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Du-Tsuen UangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Du-Tsuen Uang are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Chen-Yen Wei!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chen-Yen Wei are complete. Chairman, USI Co., Ltd. | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Chen-Yen WeiHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chen-Yen Wei are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Meng-Hui Lin!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Meng-Hui Lin are complete. GM, UGT (Shanghai) Co., Ltd | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Meng-Hui LinHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Meng-Hui Lin are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Andrew Tang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Andrew Tang are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Andrew TangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Andrew Tang are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Chung Lin!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chung Lin are complete. GM, ASE Shanghai & Electronics | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Chung LinHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chung Lin are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Kenneth Hsiang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kenneth Hsiang are complete. CEO, ISE Labs | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Kenneth HsiangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kenneth Hsiang are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Chih-Hsiao Chung!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chih-Hsiao Chung are complete. GM, ASE Japan & Wuxi Tongzhi | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Chih-Hsiao ChungHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chih-Hsiao Chung are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($665.00 − strike price), using the most recent insider trade price on Form 4 (Jul 22, 2026), not a market close. | ||||||||||||||||
Shen-Fu Yu!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Shen-Fu Yu are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||
Vesting, gifts, unvested awards and holding lines for Shen-Fu YuHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Shen-Fu Yu are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||||||
Holdings and share of stake for ASE Technology Holding Co., Ltd. are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $367M across 767,000 shares. Plan status and stated purpose are separate questions, and a sale can have both.
Sales with no 10b5-1 plan and no tax reference in the filing. $247M of it is Tien-Szu Chen. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Tien-Szu Chen, Apr 20, 2026
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Tien-Szu Chen GM, ASE Inc. Chung-Li Branch | 530K | $247M | 0% | 67% | Apr 20, 2026 to Apr 20, 2026 |
| Jeffrey Chen Director | 200K | $96.0M | 0% | 26% | Apr 8, 2026 to May 27, 2026 |
| Du-Tsuen Uang Chief Administration Officer | 37K | $24.3M | 0% | 7% | Jun 1, 2026 to Jul 22, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $0 | $0 | $0 | $0 |
| Jan 2026 | $0 | $0 | $0 | $0 |
| Feb 2026 | $0 | $0 | $0 | $0 |
| Mar 2026 | $0 | $0 | $0 | $0 |
| Apr 2026 | $298M | $0 | $0 | $298M |
| May 2026 | $45.0M | $0 | $0 | $45.0M |
| Jun 2026 | $16.7M | $0 | $0 | $16.7M |
| Jul 2026 | $7.6M | $0 | $0 | $7.6M |
| Aug 2026 | $0 | $0 | $0 | $0 |
| Sep 2026 | $0 | $0 | $0 | $0 |
| Oct 2026 | $0 | $0 | $0 | $0 |
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for ASE Technology Holding Co., Ltd. are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 66 Forms 3, 4 and 5 on record for ASE Technology Holding Co., Ltd. (SEC CIK 1122411), filed from Mar 18, 2026 to Sep 24, 2026; 66 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 13, 2026. Prices are the ones reported in each filing, often weighted averages. 1 filing was left out because ASE Technology Holding Co., Ltd. filed them as an owner of another company's stock.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
| Name | Last filed | Last reported balance |
|---|---|---|
| Tuck Lee | No balance on record | |
| Yee Hew | No balance on record | |
| Wen-Chyi Ong | No balance on record | |
| Mei-Yueh Ho | No balance on record | |
| Dan-Yao Chang | No balance on record | |
| Kwai Lee | No balance on record | |
| Ta-I Lin | No balance on record | |
| Yean Chen | No balance on record | |
| Dirk Wendt | No balance on record | |
| Kelvin Liu | No balance on record | |
| Chih-Wen Yu | No balance on record | |
| Hui-Min Liu | No balance on record | |
| Gichol Lee | No balance on record | |
| Nicolas Denis | No balance on record | |
| Ying Wu | No balance on record | |
| Sharon Ko | No balance on record |
Spotted something wrong on this page? Report an error. We check every report against the SEC filing and list what we fix in the corrections log.