Comparable stake leader
BlackRock, Inc.
SEC ownership of ASE Technology Holding Co., Ltd.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001122411.
Disclosed value leader
BlackRock, Inc.
Comparable rows
0/50
Latest evidence
30 Jun 2026
- Public ticker
- ASX on NYSE
- Parsed ownership sources
-
13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001122411
- Issuer location
- Kaohsiung
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ASE Technology Holding Co., Ltd. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
0/50
Latest evidence
30 Jun 2026
13F
Highest disclosed value: $1,184,626,150
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. has the largest disclosed position value at $1.18B.
0 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Disclosed position value
Top 5
BlackRock, Inc.
$1.18B
BANK OF AMERICA CORP /DE/
$423.56M
GOLDMAN SACHS GROUP INC
$374.51M
LAZARD ASSET MANAGEMENT LLC
$359.62M
UBS Group AG
$351.36M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$1,184,626,150
26,255,012 shares
|
— | 30 Jun 2026 |
| BANK OF AMERICA CORP /DE/ |
13F
Company
|
—
class O/S missing
|
$423,564,194
9,387,504 shares
|
— | 30 Jun 2026 |
| GOLDMAN SACHS GROUP INC |
13F
Company
|
—
class O/S missing
|
$374,510,427
8,300,320 shares
|
— | 30 Jun 2026 |
| LAZARD ASSET MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$359,616,534
7,970,225 shares
|
— | 30 Jun 2026 |
| UBS Group AG |
13F
Company
|
—
class O/S missing
|
$351,356,210
7,787,150 shares
|
— | 30 Jun 2026 |
| MORGAN STANLEY |
13F
Company
|
—
class O/S missing
|
$261,528,916
5,796,296 shares
|
— | 30 Jun 2026 |
| Rafferty Asset Management, LLC |
13F
Company
|
—
class O/S missing
|
$249,123,222
5,521,348 shares
|
— | 30 Jun 2026 |
| AMERICAN CENTURY COMPANIES INC |
13F
Company
|
—
class O/S missing
|
$240,615,485
5,332,790 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 20 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 33 reporting-owner rows connected to ASE Technology Holding Co., Ltd.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
33
Largest Forms 3/4/5 holder
Chen Tien-Szu
Net 12M change
$0
Latest report
12 Aug 2026
Recent insider transactions for ASE Technology Holding Co., Ltd.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Chih-Hsiao Chung | ASX | Ordinary Shares | Options Exercise | 22.7% | 73,000 | 395,000 | 13 Aug 2026 | Direct | ||
| Chih-Hsiao Chung | ASX | Stock Option (Right to Buy) | Options Exercise | -100% | -73,000 | 0 | 13 Aug 2026 | Direct | ||
| Chih-Hsiao Chung | ASX | Ordinary Shares | Options Exercise | 973.3% | 292,000 | 322,000 | 12 Aug 2026 | Direct | ||
| Chih-Hsiao Chung | ASX | Stock Option (Right to Buy) | Options Exercise | -80% | -292,000 | 73,000 | 12 Aug 2026 | Direct | ||
| Chung Lin | ASX | Ordinary Shares | Options Exercise | 33.2% | 35,000 | 140,278 | 29 Jul 2026 | Direct | ||
| Chung Lin | ASX | Stock Option (Right to Buy) | Options Exercise | -100% | -35,000 | 0 | 29 Jul 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.4% | -3,000 | 751,000 | 22 Jul 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.4% | -3,000 | 754,000 | 15 Jul 2026 | Direct | ||
| Hung Pen Chang | ASX | Ordinary Shares | Options Exercise | 4,500,000 | 4,500,000 | 13 Jul 2026 | Direct | |||
| Hung Pen Chang | ASX | Stock Option (Right to Buy) | Options Exercise | -100% | -4,500,000 | 0 | 13 Jul 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.26% | -2,000 | 757,000 | 06 Jul 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.39% | -3,000 | 759,000 | 01 Jul 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.65% | -5,000 | 762,000 | 30 Jun 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.39% | -3,000 | 767,000 | 23 Jun 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.65% | -5,000 | 770,000 | 22 Jun 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.39% | -3,000 | 775,000 | 18 Jun 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.64% | -5,000 | 778,000 | 03 Jun 2026 | Direct | ||
| Du-Tsuen Uang | ASX | Ordinary Shares | Sale | -0.63% | -5,000 | 783,000 | 01 Jun 2026 | Direct | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -100% | -2,000 | 0 | 27 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -81.8% | -9,000 | 2,000 | 26 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -45% | -9,000 | 11,000 | 25 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -31% | -9,000 | 20,000 | 22 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -23.7% | -9,000 | 29,000 | 21 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -19.2% | -9,000 | 38,000 | 20 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -16.1% | -9,000 | 47,000 | 19 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -13.8% | -9,000 | 56,000 | 18 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -12.2% | -9,000 | 65,000 | 15 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -10.8% | -9,000 | 74,000 | 14 May 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -9.78% | -9,000 | 83,000 | 24 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -8.91% | -9,000 | 92,000 | 23 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -8.18% | -9,000 | 101,000 | 22 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -7.56% | -9,000 | 110,000 | 21 Apr 2026 | By Spouse | ||
| Chen Tien-Szu | ASX | Ordinary Shares | Sale | -19% | -530,000 | 2,251,821 | 20 Apr 2026 | Direct | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -7.03% | -9,000 | 119,000 | 20 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -6.57% | -9,000 | 128,000 | 17 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -6.16% | -9,000 | 137,000 | 16 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -5.81% | -9,000 | 146,000 | 15 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -5.49% | -9,000 | 155,000 | 14 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -5.2% | -9,000 | 164,000 | 13 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -4.95% | -9,000 | 173,000 | 10 Apr 2026 | By Spouse | ||
| Chien Shen Chang | ASX | Ordinary Shares | Options Exercise | 257.5% | 4,500,000 | 6,247,647 | 09 Apr 2026 | Direct | ||
| Chien Shen Chang | ASX | Stock Option (Right to Buy) | Options Exercise | -100% | -4,500,000 | 0 | 09 Apr 2026 | Direct | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -4.71% | -9,000 | 182,000 | 09 Apr 2026 | By Spouse | ||
| Jeffrey Chen | ASX | Ordinary Shares | Sale | -4.5% | -9,000 | 191,000 | 08 Apr 2026 | By Spouse |
* marks a reported price that did not pass the local price check.