Alpha and Omega Semiconductor Ltd
Ownership
Ownership Structure
Who owns Alpha and Omega Semiconductor Ltd (AOSL)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 82.2% of the shares are freely tradable; institutional investors hold 75.1%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.90 | 3,904,776 | -0.1 | 03/31/2026 |
| Manufacturers Life Insurance Co | 5.20 | 1,574,462 | -3.3 | 03/31/2026 |
| State Street Corp | 4.63 | 1,401,550 | -4.9 | 03/31/2026 |
| Dimensional Fund Advisors, Inc. | 4.41 | 1,335,089 | -14.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.86 | 1,168,929 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.47 | 1,051,231 | +0.0 | 03/31/2026 |
| Two Sigma Investments LLC | 3.14 | 951,576 | +72.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.00 | 1,512,530 | +0.0 | 08/31/2026 |
| State Street® SPDR® S&P® Smcndctr ETF | 4.44 | 1,342,446 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.51 | 759,077 | +0.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Chang Mike F | Director | 4,259,379 | 107,336,351 $ | Aug 13, 2026 | both |
| Xue Bing | EVP-WW Sales & Bus Development | 122,785 | 3,094,182 $ | Jul 16, 2026 | direct |
| Chang Stephen Chunping | Chief Executive Officer | 100,947 | 2,543,864 $ | Aug 24, 2026 | indirect |
| Chien Joshua C. | Director | 1,368 | 34,474 $ | Jul 20, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 24, 2026 | Chang Stephen Chunping | Chief Executive Officer | Other | 100,947 | 0.00 | – |
| Aug 24, 2026 | Chang Mike F | Director | Other | 100,947 | 0.00 | – |
| Aug 13, 2026 | Chang Mike F | Director | Other | 3,000,000 | 0.00 | – |
| Jul 20, 2026 | Chien Joshua C. | Director | Other | 1,368 | 0.00 | – |
| Jul 16, 2026 | Xue Bing | EVP-WW Sales & Bus Development | Sell | 875 | 33.99 | 29,741 |
| Jul 13, 2026 | Chang Mike F | Director | Other | 23,754 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.