Alpha and Omega Semiconductor Limited (AOSL) Ownership
AOSL ownership summary
as of October 18, 2026- Institutions
- 77.1% of shares outstanding
- Insiders
- 17.02% of shares outstanding
- Shares outstanding
- 30.3M
- Float
- 24.9M shares available to trade
- Short interest
- 11.72% 2.9M shares short
- Days to cover
- 5.24 short interest up 0.8% vs prior month
- Institutions 77.12%
- Insiders 17.02%
- Other investors 5.86%
AOSL top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 14.05% | 4.3M | $92.6M | +351,752 (+9.0%) | June 30, 2026 |
| 2 | State Street Corp | 7.75% | 2.3M | $51.1M | +945,898 (+67.5%) | June 30, 2026 |
| 3 | Manufacturers Life Insurance Co | 4.54% | 1.4M | $29.9M | −199,379 (−12.7%) | June 30, 2026 |
| 4 | Dimensional Fund Advisors, Inc. | 4.41% | 1.3M | $29.0M | −228,782 (−14.6%) | June 30, 2026 |
| 5 | Vanguard Portfolio Management, LLC | 3.67% | 1.1M | $24.2M | −57,449 (−4.9%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 3.53% | 1.1M | $23.3M | +19,664 (+1.9%) | June 30, 2026 |
| 7 | Two Sigma Investments LLC | 3.14% | 952K | $20.7M | +398,565 (+72.1%) | June 30, 2026 |
| 8 | FMR Inc | 2.61% | 792K | $17.2M | +247,006 (+45.3%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.17% | 659K | $14.3M | +30,234 (+4.8%) | June 30, 2026 |
| 10 | Connor Clark & Lunn Inv Mgmt Ltd | 2.10% | 637K | $13.9M | +300,177 (+89.1%) | June 30, 2026 |
| 11 | Weber Capital Management LLC | 1.78% | 538K | $11.7M | −3,871 (−0.7%) | June 30, 2026 |
| 12 | Wellington Management Company LLP | 1.36% | 413K | $9.0M | −281,898 (−40.6%) | June 30, 2026 |
| 13 | Charles Schwab Investment Management Inc | 1.33% | 403K | $8.8M | −17,230 (−4.1%) | June 30, 2026 |
| 14 | Acadian Asset Management LLC | 1.07% | 324K | $7.0M | +113,226 (+53.8%) | June 30, 2026 |
| 15 | Royce & Associates, LP | 1.02% | 309K | $6.7M | −209,100 (−40.4%) | June 30, 2026 |
| 16 | D. E. Shaw & Co LP | 0.94% | 284K | $6.2M | +4,637 (+1.7%) | June 30, 2026 |
| 17 | The Goldman Sachs Group Inc | 0.92% | 279K | $6.1M | +11,431 (+4.3%) | June 30, 2026 |
| 18 | Millennium Management LLC | 0.88% | 268K | $5.8M | +69,866 (+35.3%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.86% | 261K | $5.7M | +14,228 (+5.8%) | June 30, 2026 |
| 20 | Jane Street Group LLC | 0.77% | 234K | $5.1M | +234,335 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 2.7M shares and 7 cut 998K.
AOSL top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 4.87% | 1.5M | $32.1M | +381 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.50% | 759K | $16.5M | — | August 31, 2026 |
| 3 | Vanguard Information Technology ETF | 2.13% | 644K | $14.0M | +1,487 (+0.2%) | September 30, 2026 |
| 4 | iShares Russell 2000 ETF | 2.12% | 642K | $14.0M | −7,424 (−1.1%) | September 30, 2026 |
| 5 | State Street® SPDR® S&P® Smcndctr ETF | 2.08% | 630K | $13.7M | +2,674 (+0.4%) | September 30, 2026 |
| 6 | DFA US Small Cap Value I | 1.20% | 363K | $7.9M | −58,991 (−14.0%) | August 31, 2026 |
| 7 | Fidelity Small Cap Index | 0.89% | 270K | $5.9M | +1,939 (+0.7%) | July 31, 2026 |
| 8 | Fidelity Select Semiconductors | 0.79% | 239K | $5.2M | −231,200 (−49.1%) | August 31, 2026 |
| 9 | iShares Russell 2000 Value ETF | 0.78% | 237K | $5.2M | +360 (+0.2%) | September 30, 2026 |
| 10 | State Street SPDR Port S&P 600 Sm CpETF | 0.76% | 230K | $5.0M | — | September 30, 2026 |
| 11 | BlackRock Advantage Small Cap Core Instl | 0.70% | 213K | $4.6M | +5,748 (+2.8%) | August 31, 2026 |
| 12 | iShares S&P Small-Cap 600 Value ETF | 0.69% | 210K | $4.6M | — | September 30, 2026 |
| 13 | JHancock Small Cap Core NAV | 0.58% | 174K | $3.8M | −302,400 (−63.4%) | August 31, 2026 |
| 14 | Dimensional US Small Cap Value ETF | 0.58% | 174K | $3.8M | — | September 24, 2026 |
| 15 | Schwab Fundamental U.S. Small CompanyETF | 0.48% | 144K | $3.1M | +203 (+0.1%) | September 30, 2026 |
| 16 | Vanguard Russell 2000 ETF | 0.48% | 144K | $3.1M | +2,027 (+1.4%) | September 30, 2026 |
| 17 | Schwab US Small-Cap ETF™ | 0.44% | 133K | $2.9M | +81 (+0.1%) | September 30, 2026 |
| 18 | DFA US Small Cap I | 0.44% | 133K | $2.9M | — | August 31, 2026 |
| 19 | State Street® SPDR® S&P 600™ Sm CpValETF | 0.43% | 130K | $2.8M | — | September 30, 2026 |
| 20 | JNL Multi-Manager Small Cap Value I | 0.43% | 129K | $2.8M | +129,266 (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AOSL insider transactions
latest 10| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-17 | Stephen Chunping Chang | Sell | $34.47 | 14,884 | $513,051 |
| 2026-04-17 | Yifan Liang | Sell | $35.00 | 8,625 | $301,875 |
| 2026-04-16 | Bing Xue | Sell | $31.21 | 1,832 | $57,177 |
| 2026-04-14 | Stephen Chunping Chang | Sell | $31.90 | 5,594 | $178,449 |
| 2026-04-14 | Yifan Liang | Sell | $30.57 | 26,517 | $810,625 |
| 2026-03-16 | Bing Xue | Sell | $21.92 | 2,408 | $52,783 |
| 2026-03-09 | Mike F Chang | Buy | $19.00 | 33,727 | $640,813 |
| 2026-01-15 | Bing Xue | Sell | $22.43 | 737 | $16,531 |
| 2025-12-15 | Bing Xue | Sell | $20.56 | 1,845 | $37,933 |
| 2025-05-12 | Bing Xue | Sell | $23.73 | 1,845 | $43,782 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
AOSL shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AOSL
Institutional investors own 77.1% of Alpha and Omega Semiconductor's shares and insiders 17.02%. The largest holder is BlackRock Inc with 14.05% of the shares (4.3M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 11.72% of the float, or 5.24 days of average trading volume. The share count rose 12.2% since 2014.
Related: AOSL analyst forecast, AOSL key metrics. See the AOSL stock overview for the latest quote and news.
AOSL ownership FAQ
Who owns the most Alpha and Omega Semiconductor stock?
The largest shareholders of Alpha and Omega Semiconductor are BlackRock Inc (14.05%), State Street Corp (7.75%), Manufacturers Life Insurance Co (4.54%), Dimensional Fund Advisors, Inc. (4.41%), Vanguard Portfolio Management, LLC (3.67%).
What percentage of Alpha and Omega Semiconductor is owned by institutions?
Institutions hold 77.1% of Alpha and Omega Semiconductor's shares outstanding; insiders hold 17.02%.
Which funds own Alpha and Omega Semiconductor?
The largest fund holders of Alpha and Omega Semiconductor are iShares Core S&P Small-Cap ETF (4.87%), Vanguard MStar Total Stk Mkt Idx Invest (2.50%), Vanguard Information Technology ETF (2.13%), iShares Russell 2000 ETF (2.12%), State Street® SPDR® S&P® Smcndctr ETF (2.08%).
What is Alpha and Omega Semiconductor's short interest?
2.9M shares of Alpha and Omega Semiconductor were sold short, 11.72% of the float; at the average daily volume it would take 5.24 days to cover.
Are insiders buying or selling Alpha and Omega Semiconductor?
Of the latest 10 reported insider transactions in Alpha and Omega Semiconductor (since May 12, 2025), 1 were purchases and 9 were sales.
How many shares of Alpha and Omega Semiconductor are outstanding?
Alpha and Omega Semiconductor has 30.3M shares outstanding, of which 24.9M are in the public float.