ASE Technology Holding Co., Ltd.
ASE Technology Holding Co., Ltd. (ASX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ASX · as of Mar 31, 2025
Ownership Breakdown
296
Institutional Holders
▲ 3 vs Q4
$1.55B
Total Inst. Value
▼ $135.16M vs Q4
2.19B
Shares Outstanding
freeFloat 74.26%
175.87M
13F Shares Held
▲ 8.87M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ASX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
LAZARD ASSET MANAGEMENT LLC semiconductors & related devices | 18.23M | 42.09% | 42.09% | $159.68B | May 15, 2025 | ▼ 154.6K |
UBS GROUP AG semiconductors & related devices | 17.37M | 40.10% | 40.10% | $152.14B | May 13, 2025 | ▲ 3.28M |
BLACKROCK, INC. semiconductors & related devices | 14.98M | 34.60% | 34.60% | $131.26B | May 2, 2025 | ▼ 18.7K |
ACADIAN ASSET MANAGEMENT LLC semiconductors & related devices | 10.97M | 25.34% | 25.34% | $96.11B | May 21, 2025 | ▲ 2.84M |
FISHER ASSET MANAGEMENT, LLC semiconductors & related devices | 9.57M | 22.10% | 22.10% | $83.85B | May 14, 2025 | ▼ 6.10M |
BANK OF AMERICA CORP /DE/ semiconductors & related devices | 7.42M | 17.13% | 17.13% | $64.98B | May 15, 2025 | ▼ 27.1K |
MORGAN STANLEY semiconductors & related devices | 7.09M | 16.37% | 16.37% | $62.10B | May 15, 2025 | ▼ 970.9K |
GOLDMAN SACHS GROUP INC semiconductors & related devices | 5.78M | 13.33% | 13.33% | $50.59B | Jun 27, 2025 | ▲ 780.7K |
JPMORGAN CHASE & CO semiconductors & related devices | 5.22M | 12.05% | 12.05% | $45.72B | May 12, 2025 | ▲ 357.9K |
SCHRODER INVESTMENT MANAGEMENT GROUP semiconductors & related devices | 4.92M | 11.35% | 11.35% | $43.26B | May 13, 2025 | ▲ 544.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
30
Increased
+18.83M shares3
New Positions
first time holders16
Decreased
−9.83M shares0
Sold Out
fully exitedNet shares change (top 50)
+9.00M
+18.83M / −9.83M
Net new holders
+17
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ASX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
31
Sell transactions
0.06
Buy/Sell ratio
$5M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Uang Du-Tsuen Chief Administration Officer | Jun 1, 2026 | Sale | 5,000 | $607.00 | $3.04M | 783.0K | Form 4 ↗ |
Uang Du-Tsuen Chief Administration Officer | Jun 3, 2026 | Sale | 5,000 | $617.00 | $3.08M | 778.0K | Form 4 ↗ |
Chen Jeffrey director | May 22, 2026 | Sale | 9,000 | $538.00 | $4.84M | 20.0K | Form 4 ↗ |
Chen Jeffrey director | May 25, 2026 | Sale | 9,000 | $590.00 | $5.31M | 11.0K | Form 4 ↗ |
Chen Jeffrey director | May 26, 2026 | Sale | 9,000 | $630.00 | $5.67M | 2.0K | Form 4 ↗ |
Chen Jeffrey director | May 27, 2026 | Sale | 2,000 | $653.00 | $1.31M | 0 | Form 4 ↗ |
Chen Jeffrey director | May 19, 2026 | Sale | 9,000 | $483.00 | $4.35M | 47.0K | Form 4 ↗ |
Chen Jeffrey director | May 20, 2026 | Sale | 9,000 | $477.00 | $4.29M | 38.0K | Form 4 ↗ |
Chen Jeffrey director | May 21, 2026 | Sale | 9,000 | $505.00 | $4.54M | 29.0K | Form 4 ↗ |
Chen Jeffrey director | May 14, 2026 | Sale | 9,000 | $560.00 | $5.04M | 74.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
ASE Technology Holding Co., Ltd. (ASX) is primarily owned by institutional investors, who hold approximately 8.0% of total shares outstanding. Company insiders own approximately 25.74%, while retail and public investors account for the remaining 66.24%.
The largest institutional shareholder of ASE Technology Holding Co., Ltd. is LAZARD ASSET MANAGEMENT LLC, holding approximately 18.23 million shares — equal to 42.09% of outstanding shares — as of March 31, 2025.
A total of 296 institutional investors currently hold ASX stock, with a combined institutional value of approximately $1.55 billion as of the most recent 13F filing period.
Frequently asked questions
ASX ownershipASE Technology Holding Co., Ltd. (ASX) is primarily owned by institutional investors, who hold approximately 8.0% of shares. The largest shareholder is LAZARD ASSET MANAGEMENT LLC with a 42.09% stake. Company insiders hold 25.74%. Data sourced from SEC Form 13F as of March 31, 2025.