EXHIBIT 99.1

Alpha and Omega Semiconductor Reports Financial Results for the Fiscal First Quarter of 2014 Ended September 30, 2013

SUNNYVALE, Calif., Oct. 30, 2013 (GLOBE NEWSWIRE) -- Alpha and Omega Semiconductor Limited ("AOS") (Nasdaq:AOSL), today reported financial results for the fiscal first quarter of 2014 ended September 30, 2013.

The results for the fiscal first quarter of 2014 ended September 30, 2013 were as follows:

On a non-GAAP basis excluding the effect of the share-based compensation charges in each of the periods presented, the results were as set forth below (see detailed reconciliation included at the end of this press release).

"I am pleased that we grew our revenue by 8.9% in the quarter sequentially despite the sluggish economy. We achieved growth in our PC, Consumer, and Power Supply markets, and started to see gradual business recovery with our major OEM customer. We also continue to see growth in our emerging regions fueled by design wins of our new products," said Dr. Mike Chang, Chairman and Chief Executive Officer of AOS.

"Looking ahead into the coming quarter, our revenue projection reflects a seasonal demand drop that we see in the PC and TV markets and year end customer inventory reductions. Given our lower revenue projection in the December quarter, we are taking measures to improve operational efficiency and reduce our overhead spending."

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Fiscal Q2, 2014 Business Outlook

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.

• Revenue is expected to be between $75 million and $79 million.
   
• GAAP gross margin is expected to be in the range of 18%, plus or minus 1%.
   
• GAAP operating expense is expected to be in the range of $15 million, plus or minus $1 million.
   
• Tax expense is expected to be approximately $1 million to $1.3 million.

The above projections on GAAP gross margin and GAAP operating expense include estimated share-based compensation expense of $1 million to $1.2 million.

Conference Call and Webcast

AOS plans to conduct an investor teleconference and live webcast to discuss the financial results for the fiscal first quarter of 2014 ended September 30, 2013 today, October 30, 2013 at 2:00 p.m. PDT / 5:00 p.m. EDT. To participate in the live call, analysts and investors should dial 877-312-8797 (or 253-237-1194 if outside the U.S.). To access the live webcast and the subsequent replay of the conference call, which will be available for seven days after the live call, go to 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, projected amount of revenues, gross margin, operating expenses, operating income, tax expenses, net income, share-based compensation expenses, expectation with respect to our ability and strategy to develop new products, grow our revenue and profitability and recover loss of market shares, our expectation with respect to releasing new technology platforms and obtaining design wins, the seasonality of our markets and other information under the section entitled "Fiscal Q2, 2014 Business Outlook". 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 decline of the PC industry and our ability to respond to such decline, our ability to introduce or develop new and enhanced products that achieve market acceptance; 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, and other risks as described in our SEC filings, including our Annual Report on Form 10-K for the fiscal year ended June 30, 2013 filed on August 30, 2013. 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, including non-GAAP gross margin, operating income, net income and diluted earnings per share ("EPS"). These supplemental measures exclude share-based compensation expenses. We believe that non-GAAP financial measures can provide useful information to both management and investors by excluding certain non-cash expenses that are not indicative of our core operating results. 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 the non-GAAP financial measures we use may not be directly comparable to those reported by other companies. For example, the term used in this press release, non-GAAP net income, does 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. We seek to compensate for this limitation by providing a detailed reconciliation of the non-GAAP financial measures to the most directly comparable U.S. GAAP measures in the tables attached to this press release.  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.

About Alpha and Omega Semiconductor

Alpha and Omega Semiconductor Limited, or AOS, is a designer, developer and global supplier of a broad range of power semiconductors, including a wide portfolio of Power MOSFET, IGBT and Power IC products.  AOS has developed extensive intellectual property and technical knowledge that encompasses the latest advancements in the power semiconductor industry, which enables us to introduce innovative products to address the increasingly complex power requirements of advanced electronics.  AOS differentiates itself by integrating its Discrete and IC semiconductor process technology, product design, and advanced packaging know-how to develop high performance power management solutions. AOS's portfolio of products targets high-volume applications, including portable computers, flat panel TVs, LED lighting, smartphones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. For more information, please visit http://www.aosmd.com/. For investor relations, please contact So-Yeon Jeong at investors@aosmd.com.

The following consolidated financial statements are prepared in accordance with U.S. GAAP.

CONTACT: Investor Relations
         So-Yeon Jeong
         investors@aosmd.com