What SEC filings does Alpha and Omega Semiconductor Limited submit to the SEC?

Alpha and Omega Semiconductor Limited (AOSL) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about AOSL?

A Form 4 for AOSL discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Alpha and Omega Semiconductor Limited?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for AOSL?

The 10-K is Alpha and Omega Semiconductor Limited's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all AOSL SEC filings directly on EDGAR?

You can view all historical Alpha and Omega Semiconductor Limited filings on the SEC EDGAR company page for AOSL. Each filing card on this page links directly to the original SEC document.

How often does Alpha and Omega Semiconductor Limited file with the SEC?

Alpha and Omega Semiconductor Limited files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling AOSL shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

AOSL SEC Filing News — Alpha and Omega Semiconductor Limited

Latest SEC filings for Alpha and Omega Semiconductor Limited (AOSL) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-11.

Alpha and Omega Semiconductor Limited designs, develops, and supplies power semiconductor products for computing, consumer electronics, communication, and industrial applications in Hong Kong, China, South Korea, the United States, and internationally. The company offers power discrete products, including industry standard trench metal-oxide-semiconductor field-effect transistors (MOSFETs), Shielded-Gate low- and mid-voltage MOSFETs, SuperJunction high-voltage MOSFETs, and trench-stop insulated …

Sector: Technology Industry: Semiconductors Market Cap: $676.3M CIK: 1387467

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for AOSL currently lean bearish. Of the 20 filing records displayed, 4 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

AOSL Filing Activity Snapshot 2026-05-18 — 2026-09-11

Insider Transactions (Form 4)

0 buys vs 4 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$231.5K

Xue Bing (EVP-WW Sales & Bus Development) · 2026-06-17

4,916 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 13 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 13 filings in this group are Form 4s for Alpha and Omega Semiconductor Limited.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 13 insider filings shown, the breakdown is 8 gift, 4 open-market sale and 1 compensation award. 4 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Gift ×8: Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.
Open-market sale ×4: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×1: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Form 4 Gift Tax / Compensation Filing 2026-09-11

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Stephen Chunping (Director, Chief Executive Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	100,947	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Stephen Chunping (Director, Chief Executive Officer) Shares: 100,947

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-09-11

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	100,947	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 100,947

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-08-14

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	3,000,000	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 3,000,000

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-07-21

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chien Joshua C. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	1,368	—	—

Filing: Form 4 (Insider Transaction) Insider: Chien Joshua C. (Director) Shares: 1,368

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-17

AOSL insider Xue Bing (EVP-WW Sales & Bus Development) sold 875 shares (~$29.7K)

Xue Bing, listed as EVP-WW Sales & Bus Development at ALPHA & OMEGA SEMICONDUCTOR Ltd, reported an open-market sale of 875 AOSL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	875	$33.99	$29.7K

Filing: Form 4 (Insider Transaction) Insider: Xue Bing (EVP-WW Sales & Bus Development) Shares: 875 Est. Value: $29.7K

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-07-15

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	23,754	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 23,754

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-17

AOSL insider Xue Bing (EVP-WW Sales & Bus Development) sold 4,916 shares (~$231.5K)

Xue Bing, listed as EVP-WW Sales & Bus Development at ALPHA & OMEGA SEMICONDUCTOR Ltd, reported an open-market sale of 4,916 AOSL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	4,916	$47.09	$231.5K

Filing: Form 4 (Insider Transaction) Insider: Xue Bing (EVP-WW Sales & Bus Development) Shares: 4,916 Est. Value: $231.5K

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-06-03

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	30,000	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 30,000

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-05-28

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	39,780	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 39,780

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-05-27

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Chang Mike F (Director, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	736,252	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Mike F (Director, 10% Owner) Shares: 736,252

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-05-26

AOSL insider Chen Claudia (Director) sold 4,061 shares (~$160.5K)

Chen Claudia, listed as Director at ALPHA & OMEGA SEMICONDUCTOR Ltd, reported an open-market sale of 4,061 AOSL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	3,844	$39.47	$151.7K
`S`	Open-market sale	217	$40.54	$8.8K

Filing: Form 4 (Insider Transaction) Insider: Chen Claudia (Director) Shares: 4,061 Est. Value: $160.5K

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-05-26

AOSL insider Form 4 filed for equity award, exercise, or tax withholding

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	2,000	—	—

Filing: Form 4 (Insider Transaction) Insider: Chang Stephen Chunping (Director, Chief Executive Officer) Shares: 2,000

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-05-20

AOSL insider Xue Bing (EVP-WW Sales & Bus Development) sold 4,916 shares (~$201.6K)

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	4,916	$41.00	$201.6K

Filing: Form 4 (Insider Transaction) Insider: Xue Bing (EVP-WW Sales & Bus Development) Shares: 4,916 Est. Value: $201.6K

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 4 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Alpha and Omega Semiconductor Limited has 4 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-07-16

AOSL Form 144 filed for proposed insider sale by BING XUE (875 shares) ~$29.7K

BING XUE filed a Form 144 with the SEC indicating intent to sell AOSL (ALPHA & OMEGA SEMICONDUCTOR Ltd) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: BING XUE Shares: 875 Est. Value: $29.7K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-06-16

AOSL Form 144 filed for proposed insider sale by BING XUE (4,916 shares) ~$231.5K

Filing: Form 144 (Proposed Sale Notice) Insider: BING XUE Shares: 4,916 Est. Value: $231.5K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-05-22

AOSL Form 144 filed for proposed insider sale by CLAUDIA CHEN (4,061 shares) ~$160.5K

CLAUDIA CHEN filed a Form 144 with the SEC indicating intent to sell AOSL (ALPHA & OMEGA SEMICONDUCTOR Ltd) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: CLAUDIA CHEN Shares: 4,061 Est. Value: $160.5K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-05-18

AOSL Form 144 filed for proposed insider sale by BING XUE (4,916 shares) ~$201.6K

Filing: Form 144 (Proposed Sale Notice) Insider: BING XUE Shares: 4,916 Est. Value: $201.6K

View on SEC EDGAR → Open Filing Document →

Material Events 2 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 2 in this period for Alpha and Omega Semiconductor Limited. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-12

AOSL filed 8-K — material company event

ALPHA & OMEGA SEMICONDUCTOR Ltd filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-10

AOSL filed 8-K — material company event

ALPHA & OMEGA SEMICONDUCTOR Ltd filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 annual report (10-K) for Alpha and Omega Semiconductor Limited.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-K Annual Report 2026-08-27

AOSL filed Annual Report (10-K)

ALPHA & OMEGA SEMICONDUCTOR Ltd filed its annual report with the SEC. This report includes audited financial statements, business overview, risk factors, and management discussion.

Filing: 10-K (Annual Report)

View on SEC EDGAR → Open Filing Document →

How we classify Alpha and Omega Semiconductor Limited's filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on AOSL. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — AOSL SEC Filings

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AOSL Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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