Financial Results for Fiscal Q2 Ended December 31, 2020

• Revenue was $158.8 million, an increase of 4.8% from the prior quarter and an increase of 34.8% from the same quarter last year.
• GAAP gross margin was 30.7%, up from 28.1% in the prior quarter and up from 20.7% in the same quarter last year.
• Non-GAAP gross margin was 31.4%, up from 29.0% in the prior quarter and up from 28.3% in the same quarter last year.
• GAAP operating expenses were $35.2 million, up from $32.2 million in the prior quarter and up from $27.8 million in the same quarter last year.
• Non-GAAP operating expenses were $31.5 million, an increase of $2.9 million from last quarter and an increase of $5.8 million from the same quarter last year.
• GAAP operating income was $13.6 million, up from $10.3 million in the prior quarter and up from $3.4 million loss in the same quarter last year.
• Non-GAAP operating income was $18.5 million as compared to $15.4 million for the prior quarter and $7.6 million for the same quarter last year.
• GAAP net income per share attributable to AOS was $0.47, compared to $0.36 for the prior quarter and $0.04 net loss per share for the same quarter a year ago.
• Non-GAAP net income per share attributable to AOS was $0.65 compared to $0.55 for the prior quarter and $0.23 for the same quarter a year ago.
• Consolidated cash flow provided by operating activities was $36.1 million, compared to $9.8 million in the prior quarter. Operating cash flow provided by AOS alone (excluding the JV Company) was $35.7 million, compared to $12.7 million in the prior quarter.
• The Company closed the quarter with $181.0 million of cash and cash equivalents, including $38.6 million cash balance at the JV Company.

AOS Chairman and Chief Executive Officer Dr. Mike Chang commented, “Our fiscal second quarter marked an impressive finish to calendar year 2020, as solid shipments across most of our product categories drove strong financial performance in the quarter. We grew revenue by 35% year-over-year, achieved higher utilization and operational efficiency at our manufacturing facilities, and continued to be disciplined with our spending. All of this led to records in non-GAAP gross margin of 31.4% and non-GAAP EPS of $0.65.”

Dr. Chang continued, “Our mission is to become a leading designer, developer, and global supplier of a broad portfolio of power semiconductors, and I am proud of what our team has accomplished and the groundwork we are laying for long-term and sustainable success. Obviously, we faced tremendous challenges in calendar year 2020, including the COVID-19 pandemic, trade conflicts, and political and social unrest in different parts of the world. Despite these challenges, we made significant progress toward our calendar year 2021 target of $600 million in annual revenue. We did this by focusing on disciplined execution and developing a healthy pipeline of new products, new design wins, and new customers.”

Business Outlook for Fiscal Q3 Ending March 31, 2021

The following statements are based on management's current expectations. These statements are forward-looking, and actual results may differ materially. AOS undertakes no obligation to update these statements.

Our expectations for the third quarter of fiscal year 2021 are as follows:

• Revenue is expected to be approximately $157 million, plus or minus $3 million.
• GAAP gross margin is expected to be approximately 28.7% plus or minus 1%. Non-GAAP gross margin is expected to be approximately 29.5% plus or minus 1%. Non-GAAP gross margin excludes $0.8 million amortization of acquired IP and $0.5 million of estimated share-based compensation charge.
• GAAP operating expenses are expected to be in the range of $33.8 million plus or minus $1 million. Non-GAAP operating expenses are expected to be in the range of $29.5 million plus or minus $1 million. Non-GAAP operating expenses exclude $3.3 million of estimated share-based compensation charge and $1.0 million of estimated professional fees related to the government investigation.
• Income tax expense is expected to be approximately $0.7 million to $1.0 million.
• Loss attributable to noncontrolling interest is expected to be approximately $0.2 million.

Conference Call and Webcast

AOS plans to hold an investor teleconference and live webcast to discuss the financial results for the fiscal second quarter ended December 31, 2020 today, February 4, 2021 at 2:00 p.m. PT / 5:00 p.m. ET. To listen to the live conference call, please dial 877-683-1095 (or 647-689-5445 if dialing from outside the United States and Canada). The conference ID number is 5785406. A live webcast of the call will also be available in the "Events & Presentations" section of the company's investor relations website, http://investor.aosmd.com/. The webcast replay will be available for seven days after the live call on the same website. In addition, a copy of the script of management's prepared remarks and a live webcast of the call will also be available in the "Events & Presentations" section of the company's investor relations website, http://investor.aosmd.com.

Forward-Looking Statements

This press release contains forward-looking statements that are based on current expectations, estimates, forecasts and projections of future performance based on management's judgment, beliefs, current trends, and anticipated product performance. These forward-looking statements include, without limitation, statements relating to expected growth rate, our product portfolios, projected amount of revenue, gross margin, operating income (loss), income tax expenses, net income (loss), noncontrolling interest, and share-based compensation expenses, non-GAAP gross margin, non-GAAP operating expenses, tax expenses, and non-GAAP loss attributable to noncontrolling interest, our objectives to achieve long-term success, our ability to gain new customers and design wins, and other information under the section entitled “Business Outlook for Fiscal Q3 Ending March 31, 2021”. Forward-looking statements involve risks and uncertainties that may cause actual results to differ materially from those contained in the forward-looking statements. These factors include, but are not limited to, the impact of COVID-19 pandemic on our business; our ability to successfully operate our joint venture in China; our ability to develop and succeed in the digital power business; difficulties and challenges in executing our diversification strategy into different market segments; new tariffs on goods from China; ordering pattern from distributors and seasonality; changes in regulatory environment and government investigation; our ability to introduce or develop new and enhanced products that achieve market acceptance; decline of PC markets; the actual product performance in volume production; the quality and reliability of our product, our ability to achieve design wins; the general business and economic conditions; the state of semiconductor industry and seasonality of our markets; our ability to maintain factory utilization at a desirable level; and other risks as described in our SEC filings, including our Annual Report on Form 10-K for the fiscal year ended June 30, 2020 filed by AOS with the SEC and other periodic reports we filed with the SEC. Other unknown or unpredictable factors or underlying assumptions subsequently proving to be incorrect could cause actual results to differ materially from those in the forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, level of activity, performance, or achievements. You should not place undue reliance on these forward-looking statements. All information provided in this press release is as of today's date, unless otherwise stated, and AOS undertakes no duty to update such information, except as required under applicable law.

Use of Non-GAAP Financial Measures

To supplement our unaudited consolidated financial statements presented on a basis consistent with U.S. GAAP, we disclose certain non-GAAP financial measures for our historical performance, including non-GAAP gross profit, gross margin, operating income (loss), net loss attributable to noncontrolling interest, net income (loss), diluted earnings per share ("EPS") and EBITDAS. These supplemental measures exclude, among other items, share-based compensation expenses, production ramp up costs related to the JV Company, legal and profession fees related to government investigation, as well as amortization of purchased intangible. We also disclose certain non-GAAP financial measures in our guidance for the next quarter, including non-GAAP gross margin, operating expenses and loss attributable to noncontrolling interest. We believe that these historical and forecast non-GAAP financial measures provide useful information to both management and investors by excluding certain items and expenses that are not indicative of our core operating results or do not reflect our normal business operations. In addition, our management uses non-GAAP measures to compare our performance relative to forecasts and to benchmark our performance externally against competitors. Our use of non-GAAP financial measures has certain limitations in that such non-GAAP financial measures may not be directly comparable to those reported by other companies. For example, the terms used in this press release, such as non-GAAP net income (loss) or non-GAAP operating expenses, do not have a standardized meaning. Other companies may use the same or similarly named measures, but exclude different items, which may not provide investors with a comparable view of our performance in relation to other companies. In addition, we included amount of income tax effect of non-GAAP adjustments in the non-GAAP net income of reconciliation table for all periods presented as the management believes that such non-GAAP presentation provides useful information to investors, even though the amounts are not significant. We seek to compensate for the limitation of our non-GAAP presentation by providing a detailed reconciliation of the non-GAAP financial measures to the most directly comparable U.S. GAAP measures both in the text in this press release and in the tables attached hereto. Investors are encouraged to review the related U.S. GAAP financial measures and the reconciliation of these non-GAAP financial measures to their most directly comparable U.S. GAAP financial measures.