ASE Technology · ownership
Who owns ASE Technology?
BlackRock, Inc. is the largest 13F holder: 17.1% of 13F-reported shares calc.
485 institutions report 153.1M ASE Technology shares in Form 13F, as of quarter end Jun 30, 2026; −3.9M shares vs Mar 31, 2026.
- BlackRock, Inc.17.1%26.3M shares · +4.1M vs prior quarter (up) · 13F filed Aug 7, 2026
- BANK OF AMERICA CORP /DE/6.1%9.4M shares · +2.6M vs prior quarter (up) · 13F filed Aug 14, 2026
- GOLDMAN SACHS GROUP INC5.4%8.3M shares · +2.5M vs prior quarter (up) · 13F filed Aug 14, 2026
- LAZARD ASSET MANAGEMENT LLC5.2%8.0M shares · −5.6M vs prior quarter (down) · 13F filed Aug 14, 2026
- UBS Group AG5.1%7.8M shares · −1.5M vs prior quarter (down) · 13F filed Aug 13, 2026
- MORGAN STANLEY3.8%5.8M shares · −932K vs prior quarter (down) · 13F filed Aug 13, 2026
- Rafferty Asset Management, LLC3.6%5.5M shares · +1.9M vs prior quarter (up) · 13F filed Aug 14, 2026
- AMERICAN CENTURY COMPANIES INC3.5%5.3M shares · −495K vs prior quarter (down) · 13F filed Aug 12, 2026
- JPMORGAN CHASE & CO3.5%5.3M shares · +2.7M vs prior quarter (up) · 13F filed Aug 12, 2026
- ACADIAN ASSET MANAGEMENT LLC3.2%4.9M shares · −2.5M vs prior quarter (down) · 13F filed Aug 13, 2026
- Fisher Asset Management, LLC2.9%4.4M shares · −403K vs prior quarter (down) · 13F filed Aug 4, 2026
- CITIGROUP INC2.8%4.3M shares · +802K vs prior quarter (up) · 13F filed Aug 3, 2026
- Man Group plc2.5%3.9M shares · +3.5M vs prior quarter (up) · 13F filed Aug 14, 2026
- BARCLAYS PLC2.3%3.5M shares · +118K vs prior quarter (up) · 13F filed Aug 14, 2026
- Cullen Capital Management, LLC1.4%2.1M shares · −1.9M vs prior quarter (down) · 13F filed Aug 13, 2026
- Creative Planning1.3%2.0M shares · +103K vs prior quarter (up) · 13F filed Aug 13, 2026
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main1.2%1.8M shares · +1K vs prior quarter (up) · 13F filed Aug 14, 2026
- DIMENSIONAL FUND ADVISORS LP1.0%1.6M shares · +188K vs prior quarter (up) · 13F filed Aug 11, 2026
- EARNEST PARTNERS LLC0.9%1.4M shares · −293K vs prior quarter (down) · 13F filed Aug 13, 2026
- ENVESTNET ASSET MANAGEMENT INC0.9%1.4M shares · −587K vs prior quarter (down) · 13F filed Aug 3, 2026
Share of 13F-reported shares, not of shares outstanding. 13F covers managers with over $100M in US equities; it is not a full shareholder list.
Method and sources
Source: SEC Form 13F data sets (bulk). Each row links to the holder’s own 13F-HR filing. Holder names exactly as filed; one group can file under several names and CIKs (for example two Vanguard entities), and they are listed separately, as filed.
% = the holder’s shares ÷ all shares reported in 13F filings for this company and quarter (calculated by Hollsteen). This is not a share of shares outstanding. Change = shares vs the same filer’s 13F for the prior quarter (Mar 31, 2026).
Erroneous filings and rows are handled by a fixed rule set (restatements replace originals; non-equity rows and implausible rows excluded): 4 erroneous filings excluded or replaced this quarter. No market values are shown.
SEC filings only. No price or market data.
Who holds more than 5%?
No current 13D/13G filing above 5%
Schedule 13D/13G filings (0) ›
Method and sources
Schedule 13D (active) and 13G (passive) are filed by holders of more than 5% of a class. The percentage is the holder’s own cover-page “percent of class”. A filing older than 18 months (filed before 2025-04-17) is marked stale and is never shown as a current holding. Data as of Oct 15, 2026.
SEC filings only.
Are insiders buying or selling?
0 open-market purchases, 39 sales in 12 months
Form 4, Oct 15, 2025 – Oct 15, 2026 · 0 shares bought, 770,000 shares sold (net −770K) · as of Oct 15, 2026
Latest 25 of 62 Form 4 transactions ›
| Date | Insider (as filed) | Transaction | Shares | Held after |
|---|---|---|---|---|
| Oct 12, 2026 | Uang Du-Tsuen · Chief Administration Officer | Open-market sale | 3,000 disposed | 838,000 |
| Sep 22, 2026 | Chang Hung Pen · Director | Option exercise / RSU conversion | 300,000 acquired | 4,800,000 |
| Sep 7, 2026 | Tsai Chi-Wen · Chairman & President, SPIL | Grant or award | 334,000 acquired | 15,598,000 |
| Sep 7, 2026 | Chung Chih-Hsiao · GM, ASE Japan & Wuxi Tongzhi | Grant or award | 30,000 acquired | 425,000 |
| Sep 7, 2026 | Hsiang Kenneth · CEO, ISE Labs | Grant or award | 40,000 acquired | 109,000 |
| Sep 7, 2026 | Lin Chung · GM, ASE Shanghai & Electronics | Grant or award | 30,000 acquired | 170,278 |
| Sep 7, 2026 | Lo Raymond · GM TW & Kaohsiung Pkg Facility | Grant or award | 400,000 acquired | 4,383,430 |
| Sep 7, 2026 | Kuo Hung-Ming · Principal Accounting Officer | Grant or award | 50,000 acquired | 985,500 |
| Sep 7, 2026 | Uang Du-Tsuen · Chief Administration Officer | Grant or award | 90,000 acquired | 841,000 |
| Sep 7, 2026 | Tung Hung-Szu · Chief Financial Officer | Grant or award | 400,000 acquired | 4,202,954 |
| Sep 7, 2026 | Tang Andrew R · Director | Grant or award | 85,000 acquired | 310,000 |
| Sep 7, 2026 | Chen Tien-Szu · GM, ASE Inc. Chung-Li Branch | Grant or award | 300,000 acquired | 2,551,821 |
| Sep 7, 2026 | Wu Tien-Yue · Director | Grant or award | 600,000 acquired | 8,277,473 |
| Sep 7, 2026 | Chen Jeffrey · Director | Grant or award | 300,000 acquired | 2,683,000 |
| Sep 7, 2026 | Chen Jeffrey · Director | Gift | 600,000 disposed | 2,083,000 |
| Sep 7, 2026 | Chen Jeffrey · Director | Gift | 600,000 acquired | 600,000 |
| Aug 13, 2026 | Chung Chih-Hsiao · GM, ASE Japan & Wuxi Tongzhi | Option exercise / RSU conversion | 73,000 acquired | 395,000 |
| Aug 12, 2026 | Chung Chih-Hsiao · GM, ASE Japan & Wuxi Tongzhi | Option exercise / RSU conversion | 292,000 acquired | 322,000 |
| Jul 29, 2026 | Lin Chung · GM, ASE Shanghai & Electronics | Option exercise / RSU conversion | 25,000 acquired | 130,278 |
| Jul 29, 2026 | Lin Chung · GM, ASE Shanghai & Electronics | Option exercise / RSU conversion | 10,000 acquired | 140,278 |
| Jul 22, 2026 | Uang Du-Tsuen · Chief Administration Officer | Open-market sale | 3,000 disposed | 751,000 |
| Jul 15, 2026 | Uang Du-Tsuen · Chief Administration Officer | Open-market sale | 3,000 disposed | 754,000 |
| Jul 13, 2026 | Chang Hung Pen · Director | Option exercise / RSU conversion | 3,000,000 acquired | 3,000,000 |
| Jul 13, 2026 | Chang Hung Pen · Director | Option exercise / RSU conversion | 1,500,000 acquired | 4,500,000 |
| Jul 6, 2026 | Uang Du-Tsuen · Chief Administration Officer | Open-market sale | 2,000 disposed | 757,000 |
Method and sources
Form 4 filings (not 4/A), table I. Open market = transaction codes P (purchase) and S (sale); grants, option exercises, tax withholding and gifts are listed but not counted as buys or sells. Shares and share counts only, as filed; Hollsteen shows no per-share prices. Data is an export, as of Oct 15, 2026, not live.
SEC filings only.