Comparable stake leader
Mike F. Chang
SEC ownership of ALPHA & OMEGA SEMICONDUCTOR Ltd
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001387467.
Disclosed value leader
Mike F. Chang
Comparable rows
50/50
Latest evidence
26 May 2026
- Public ticker
- AOSL on Nasdaq
- Parsed ownership sources
- 3/4/5, 13D/G, and 13F
- Largest SEC-reported holder
- Mike F. Chang
- Latest 13D/G holder
- Mike F. Chang
- Latest parsed ownership date
- 26 May 2026
- Issuer CIK
- 0001387467
- Issuer location
- Sunnyvale, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ALPHA & OMEGA SEMICONDUCTOR 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
Mike F. Chang
Disclosed value leader
Mike F. Chang
Comparable rows
50/50
Latest evidence
26 May 2026
3/4/5
13D/G
13F
Lead comparable stake: 14%
13D/G row: Mike F. Chang
Showing 1-8 of 50 holder rows.
Quick read
Mike F. Chang leads the comparable SEC ownership view at 14%.
50 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 Mike F. Chang's linked filing trail.
Comparable ownership
Top 5
Mike F. Chang
14%
BlackRock, Inc.
13%
DIMENSIONAL FUND ADVISORS LP
5.3%
Stephen Chunping Chang
2.1%
Yifan Liang
0.91%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Mike F. Chang |
3/4/5
13D/G
Director, 10%+ Owner
|
14%
from 13D/G
|
$97,289,624
4,390,326 shares
|
+$640,813 | 26 May 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
13%
from 13D/G
|
$86,529,837
3,904,776 shares
|
— | 31 Mar 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
5.3%
|
$34,655,381
1,563,871 shares
|
-$6,155,959 | 31 Mar 2026 |
| Stephen Chunping Chang |
3/4/5
Chief Executive Officer, Director
|
2.1%
|
$14,050,991
634,070 shares
|
-$691,435 | 21 May 2026 |
| Yifan Liang |
3/4/5
CFO and Corp Secretary
|
0.91%
|
$5,969,970
269,403 shares
|
-$1,112,374 | 27 Apr 2026 |
| Bing Xue |
3/4/5
EVP-WW Sales & Bus Development
|
0.43%
|
$5,235,741
127,701 shares
|
-$454,417 | 18 May 2026 |
| Wenjun Li |
3/4/5
Chief Operating Officer
|
0.29%
|
$1,714,713
86,558 shares
|
— | 16 Mar 2026 |
| King Owyang |
3/4/5
Director
|
0.26%
|
$2,104,157
75,256 shares
|
— | 11 Nov 2025 |
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
Net insider flow leans to selling over the last 12 months. Net value: -$1,777,949.
Buys
$640,813
Insiders: 1
Sells
$2,418,762
Insiders: 4
Net
-$1,777,949
Shares: -41,997
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 33,727
Shares: 75,724
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 33,727 | 68,837 | $640,813 | $2,275,861 | -$1,635,048 |
| 3-6 | 0 | 5,042 | $0 | $109,396 | -$109,396 |
| 6-9 | 0 | 1,845 | $0 | $33,505 | -$33,505 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to ALPHA & OMEGA SEMICONDUCTOR Ltd. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
Mike F. Chang
Net 12M change
-$1,777,949
Latest report
26 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mike F. Chang | Director, 10%+ Owner | $97,289,624 | +$640,813 | +0.66% | Median | 26 May 2026 |
| Stephen Chunping Chang | Chief Executive Officer, Director | $14,050,991 | -$691,435 | -4.7% | Median | 21 May 2026 |
| Yifan Liang | CFO and Corp Secretary | $5,969,970 | -$1,112,374 | -16% | Median | 27 Apr 2026 |
| Yueh-Se Ho | Director | $5,292,805 | Mixed | 11 Nov 2021 | ||
| Bing Xue | EVP-WW Sales & Bus Development | $5,235,741 | -$454,417 | -8% | Filing P/S | 18 May 2026 |
| King Owyang | Director | $2,104,157 | Mixed | 11 Nov 2025 | ||
| Michael L. Pfeiffer | Director | $1,993,380 | Mixed | 11 Nov 2025 | ||
| Michael J. Salameh | Director | $1,812,479 | Mixed | 11 Nov 2025 | ||
| Wenjun Li | Chief Operating Officer | $1,714,713 | Mixed | 16 Mar 2026 | ||
| Claudia Chen | Director | $1,142,920 | -$160,536 | -12% | Filing P/S | 22 May 2026 |
| Lucas S. Chang | Director | $863,544 | Mixed | 11 Nov 2025 | ||
| So-Yeon Jeong | Director | $665,448 | Mixed | 11 Nov 2025 | ||
| Hanqing Li | Director | $665,448 | Mixed | 11 Nov 2025 |
Recent insider transactions for ALPHA & OMEGA SEMICONDUCTOR 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Mike F. Chang | AOSL | Common Shares | Gift | -1.09% | -39,780 | 3,614,294 | 26 May 2026 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Gift | -16.8% | -736,252 | 3,654,074 | 22 May 2026 | Direct | ||
| Claudia Chen | AOSL | Common Share | Sale | -12.6% | $160,536 | $39.53 | -4,061 | 28,192 | 22 May 2026 | Direct |
| Stephen Chunping Chang | AOSL | Common Share | Gift | -0.31% | -2,000 | 634,070 | 21 May 2026 | Direct | ||
| Bing Xue | AOSL | Common Share | Sale | -3.71% | $201,556 | $41.00 | -4,916 | 127,701 | 18 May 2026 | Direct |
| Yifan Liang | AOSL | Common Shares | Gift | -0.11% | -300 | 269,403 | 28 Apr 2026 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Gift | -0.11% | -300 | 269,703 | 27 Apr 2026 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Sale | -3.1% | $301,878 | $35.00 | -8,625 | 270,003 | 17 Apr 2026 | Direct |
| Stephen Chunping Chang | AOSL | Common Share | Sale | -2.29% | $512,987 | $34.47 | -14,884 | 635,901 | 17 Apr 2026 | Direct |
| Bing Xue | AOSL | Common Share | Sale | -1.36% | $57,177 | $31.21 | -1,832 | 132,617 | 16 Apr 2026 | Direct |
| Yifan Liang | AOSL | Common Shares | Sale | -8.69% | $810,495 | $30.57 | -26,517 | 278,628 | 14 Apr 2026 | Direct |
| Stephen Chunping Chang | AOSL | Common Share | Sale | -0.85% | $178,449 | $31.90 | -5,594 | 650,785 | 14 Apr 2026 | Direct |
| Wenjun Li | AOSL | Common Share | Award | 13.1% | 10,000 | 86,558 | 16 Mar 2026 | Direct | ||
| Wenjun Li | AOSL | Common Share | Tax liability | -7.77% | -5,607 | 66,558 | 16 Mar 2026 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Award | 0.52% | 22,500 | 4,390,326 | 16 Mar 2026 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Tax liability | -0.33% | -14,419 | 4,355,155 | 16 Mar 2026 | Direct | ||
| Bing Xue | AOSL | Common Share | Tax liability | -7.14% | -9,182 | 119,449 | 16 Mar 2026 | Direct | ||
| Bing Xue | AOSL | Common Share | Award | 28.7% | 30,000 | 134,449 | 16 Mar 2026 | Direct | ||
| Bing Xue | AOSL | Common Share | Sale | -2.08% | $52,783 | $21.92 | -2,408 | 113,631 | 16 Mar 2026 | Direct |
| Yifan Liang | AOSL | Common Shares | Tax liability | -3.91% | -11,499 | 282,645 | 16 Mar 2026 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Award | 17.3% | 45,000 | 305,145 | 16 Mar 2026 | Direct | ||
| Stephen Chunping Chang | AOSL | Common Share | Tax liability | -6.88% | -43,483 | 588,879 | 16 Mar 2026 | Direct | ||
| Stephen Chunping Chang | AOSL | Common Share | Award | 25.9% | 135,000 | 656,379 | 16 Mar 2026 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Purchase | 0.78% | $640,813 | $19.00 | 33,727 | 4,369,574 | 09 Mar 2026 | Direct |
| Bing Xue | AOSL | Common Share | Sale | -2.08% | $54,932 | $22.33 | -2,460 | 116,039 | 17 Feb 2026 | Direct |
| Bing Xue | AOSL | Common Share | Sale | -0.62% | $16,531 | $22.43 | -737 | 118,499 | 15 Jan 2026 | Direct |
| Wenjun Li | AOSL | Common Share | Tax liability | -4.19% | -3,157 | 72,165 | 02 Jan 2026 | Direct | ||
| Bing Xue | AOSL | Common Share | Tax liability | -6.75% | -8,627 | 119,236 | 02 Jan 2026 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Tax liability | -3.08% | -8,627 | 271,644 | 02 Jan 2026 | Direct | ||
| Stephen Chunping Chang | AOSL | Common Share | Tax liability | -2.08% | -12,002 | 564,862 | 02 Jan 2026 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Tax liability | -0.38% | -16,700 | 4,335,847 | 02 Jan 2026 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Gift | -0.18% | -500 | 280,271 | 15 Dec 2025 | Direct | ||
| Bing Xue | AOSL | Common Share | Sale | -1.42% | $37,933 | $20.56 | -1,845 | 127,863 | 15 Dec 2025 | Direct |
| Bing Xue | AOSL | Common Share | Sale | -1.4% | $33,505 | $18.16 | -1,845 | 129,708 | 14 Nov 2025 | Direct |
| Hanqing Li | AOSL | Common Share | Award | 31.4% | 5,681 | 23,800 | 11 Nov 2025 | Direct | ||
| So-Yeon Jeong | AOSL | Common Share | Award | 31.4% | 5,681 | 23,800 | 11 Nov 2025 | Direct | ||
| Michael L. Pfeiffer | AOSL | Common Shares | Award | 8.66% | 5,681 | 71,294 | 11 Nov 2025 | Direct | ||
| Lucas S. Chang | AOSL | Common Share | Award | 22.5% | 5,681 | 30,885 | 11 Nov 2025 | Direct | ||
| Claudia Chen | AOSL | Common Share | Award | 21.4% | 5,681 | 32,253 | 11 Nov 2025 | Direct | ||
| King Owyang | AOSL | Common Shares | Award | 8.17% | 5,681 | 75,256 | 11 Nov 2025 | Direct | ||
| Michael J. Salameh | AOSL | Common Shares | Award | 9.61% | 5,681 | 64,824 | 11 Nov 2025 | Direct | ||
| Mike F. Chang | AOSL | Common Shares | Gift | -0.91% | -40,000 | 4,352,547 | 20 Oct 2025 | Direct | ||
| Yifan Liang | AOSL | Common Shares | Gift | -0.11% | -300 | 280,536 | 17 Oct 2025 | Direct | ||
| Stephen Chunping Chang | AOSL | Common Share | Gift | -0.36% | -2,100 | 576,705 | 09 Sep 2025 | Direct | ||
| Bing Xue | AOSL | Common Share | Tax liability | -0.39% | -508 | 131,318 | 15 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.