Alpha and Omega Semiconductor Limited
Alpha and Omega Semiconductor Limited (AOSL) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AOSL · as of Sep 30, 2025
Ownership Breakdown
192
Institutional Holders
▲ 18 vs Q2
$618.85M
Total Inst. Value
▲ $61.43M vs Q2
29.93M
Shares Outstanding
freeFloat 80.42%
22.13M
13F Shares Held
▲ 385,138 vs Q2
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
AOSL largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. semiconductors & related devices | 3.85M | 12.85% | 12.85% | $107.51B | Nov 12, 2025 | ▼ 12.7K |
VANGUARD GROUP INC semiconductors & related devices | 2.45M | 8.20% | 8.20% | $68.61B | Nov 7, 2025 | ▲ 34.0K |
DIMENSIONAL FUND ADVISORS LP semiconductors & related devices | 1.69M | 5.64% | 5.64% | $47.19B | Nov 12, 2025 | ▼ 32.6K |
MANUFACTURERS LIFE INSURANCE COMPANY, THE semiconductors & related devices | 1.56M | 5.20% | 5.20% | $43.48B | Nov 14, 2025 | ▲ 143.6K |
STATE STREET CORP semiconductors & related devices | 1.21M | 4.05% | 4.05% | $33.89B | Nov 14, 2025 | ▼ 66.7K |
WELLINGTON MANAGEMENT GROUP LLP semiconductors & related devices | 865.0K | 2.89% | 2.89% | $24.18B | Nov 14, 2025 | ▲ 113.1K |
BOSTON PARTNERS semiconductors & related devices | 786.6K | 2.63% | 2.63% | $21.99B | Nov 13, 2025 | ▼ 322.7K |
ROBECO SCHWEIZ AG semiconductors & related devices | 785.3K | 2.62% | 2.62% | $21.96B | Oct 27, 2025 | ▲ 2.8K |
MILLENNIUM MANAGEMENT LLC semiconductors & related devices | 637.9K | 2.13% | 2.13% | $17.84B | Nov 14, 2025 | ▲ 232.8K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 607.5K | 2.03% | 2.03% | $16.99B | Nov 12, 2025 | ▲ 5.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
26
Increased
+992.5K shares2
New Positions
first time holders19
Decreased
−703.6K shares0
Sold Out
fully exitedNet shares change (top 50)
+288.9K
+992.5K / −703.6K
Net new holders
+9
2 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
AOSL 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.
0
Buy transactions
17
Sell transactions
0.00
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Chang Mike F
| May 26, 2026 | Gift | 39,780 | — | — | 3.61M | Form 4 ↗ |
Chang Mike F
| May 22, 2026 | Gift | 736,252 | — | — | 3.65M | Form 4 ↗ |
Chen Claudia director | May 22, 2026 | Sale | 3,844 | $39.47 | $151.7K | 28.4K | Form 4 ↗ |
Chen Claudia director | May 22, 2026 | Sale | 217 | $40.54 | $8.8K | 28.2K | Form 4 ↗ |
Chang Stephen Chunping Chief Executive Officer | May 21, 2026 | Gift | 2,000 | — | — | 634.1K | Form 4 ↗ |
Xue Bing EVP-WW Sales & Bus Development | May 18, 2026 | Sale | 4,916 | $41.00 | $201.6K | 127.7K | Form 4 ↗ |
Liang Yifan CFO and Corp Secretary | Apr 27, 2026 | Gift | 300 | — | — | 269.7K | Form 4 ↗ |
Liang Yifan CFO and Corp Secretary | Apr 28, 2026 | Gift | 300 | — | — | 269.4K | Form 4 ↗ |
Liang Yifan CFO and Corp Secretary | Apr 17, 2026 | Sale | 8,625 | $35.00 | $301.9K | 270.0K | Form 4 ↗ |
Chang Stephen Chunping Chief Executive Officer | Apr 17, 2026 | Sale | 1,492 | $32.90 | $49.1K | 649.3K | 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
Alpha and Omega Semiconductor Limited (AOSL) is primarily owned by institutional investors, who hold approximately 74.0% of total shares outstanding. Company insiders own approximately 19.58%, while retail and public investors account for the remaining 6.47%.
The largest institutional shareholder of Alpha and Omega Semiconductor Limited is BLACKROCK, INC., holding approximately 3.85 million shares — equal to 12.85% of outstanding shares — as of September 30, 2025.
A total of 192 institutional investors currently hold AOSL stock, with a combined institutional value of approximately $618,847,285 as of the most recent 13F filing period.
Frequently asked questions
AOSL ownershipAlpha and Omega Semiconductor Limited (AOSL) is primarily owned by institutional investors, who hold approximately 74.0% of shares. The largest shareholder is BLACKROCK, INC. with a 12.85% stake. Company insiders hold 19.58%. Data sourced from SEC Form 13F as of September 30, 2025.