10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_________________________________

FORM 10-K

_________________________________

(MARK ONE)

xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended June 30, 2016

OR

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM              TO             

Commission file number 001-34717

__________________________

Alpha and Omega Semiconductor Limited

(Exact name of Registrant as Specified in its Charter)

Bermuda	77-0553536
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)

Clarendon House, 2 Church Street

Hamilton HM 11, Bermuda

(Address of Principal Registered

Offices including Zip Code)

(408) 830-9742

(Registrant's Telephone Number, Including Area Code)

__________________________________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Shares, $0.002 par value per share	The NASDAQ Global Market

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  o    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  o    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months, (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x   No  o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K, or any amendment to this Form 10-K.   x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  o	Accelerated filer  x	Non-accelerated filer  o	Smaller reporting company   o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  o    No  x

The aggregate market value of the voting shares held by non-affiliates of the registrant as of December 31, 2015 was approximately $162 million based on the closing price of the registrant's common share as reported on the NASDAQ Global Market on December 31, 2015 (the last business day of the registrant's most recently completed second fiscal quarter). The common shares of the registrant held by each executive officer and director and certain affiliated shareholders who beneficially owned 10% or more of the outstanding common stock of the registrant have been excluded in such calculation as such persons and entities may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

There were 22,755,936 shares of the registrant's common shares outstanding as of July 31, 2016.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant's Proxy Statement for the registrant's 2016 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K to the extent stated herein. The Definitive Proxy Statement is expected to be filed within 120 days of the registrant's fiscal year ended June 30, 2016.

Alpha and Omega Semiconductor Limited

Form 10-K

For the Year Ended June 30, 2016

TABLE OF CONTENTS

		Page
Part I.
Item 1.	Business	1
Item 1A.	Risk Factors	13
Item 1B.	Unresolved Staff Comments	32
Item 2.	Properties	33
Item 3.	Legal Proceedings	35
Item 4.	Mine Safety Disclosures	35
Part II.		36
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	36
Item 6.	Selected Financial Data	38
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	40
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	55
Item 8.	Financial Statements and Supplementary Data	56
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	57
Item 9A.	Controls and Procedures	57
Item 9B.	Other Information	60
Part III.		61
Item 10.	Directors, Executive Officers and Corporate Governance	61
Item 11.	Executive Compensation	61
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	61
Item 13.	Certain Relationships and Related Transactions, and Director Independence	61
Item 14.	Principal Accounting Fees and Services	61
Part IV.		62
Item 15.	Exhibits and Financial Statement Schedules	62
Signatures		102

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PART I

Item 1. Business

Forward Looking Statements

This Annual Report on Form 10-K and the documents incorporated herein by reference contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are subject to the “safe harbor” created by those sections. Forward-looking statements are based on our management's beliefs and assumptions and on information currently available to our management. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “could,” “intend,” “would,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “project,” “predict,” “potential” and similar expressions intended to identify forward-looking statements. These statements involve known and unknown risks, uncertainties and other factors, which may cause our actual results, performance, time frames or achievements to be materially different from any future results, performance, time frames or achievements expressed or implied by the forward-looking statements. We discuss many of these risks, uncertainties and other factors in this Annual Report on Form 10-K in greater detail in Item 1A.“Risk Factors.” Given these risks, uncertainties and other factors, you should not place undue reliance on these forward-looking statements. Also, these forward-looking statements represent our estimates and assumptions only as of the date of this filing. You should read this Annual Report on Form 10-K in its entirety and with the understanding that our actual future results may be materially different from what we expect. We hereby qualify our forward-looking statements by these cautionary statements. Except as required by law, we assume no obligation to update these forward-looking statements publicly, or to update the reasons actual results could differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future.

Overview    

We are a designer, developer and global supplier of a broad portfolio of power semiconductors. Our portfolio of power semiconductors includes approximately 1,600 products, and has grown significantly with the introduction of over 90 new products during each of the fiscal years ended June 30, 2016, 2015 and 2014. Our teams of scientists and engineers have developed extensive intellectual properties and technical knowledge that encompass major aspects of power semiconductors, which we believe it enables us to introduce and develop innovative products to address the increasingly complex power requirements of advanced electronics. We have an extensive patent portfolio that consists of 601 patents and 150 patent applications in the United States as of June 30, 2016. We differentiate ourselves by integrating our expertise in technology, design, manufacturing capability and advanced packaging to optimize product performance and cost. Our portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment.

During the fiscal year ended June 30, 2016, we continued our diversification strategy by developing new silicon and packaging platforms to expand our serviceable available market, or SAM and offer higher performance products. Our metal-oxide-semiconductor field-effect transistors, or MOSFET, portfolio expanded significantly across a full range of voltage applications. We also developed new technologies and products designed to penetrate into markets beyond our MOSFET computing base, including the consumer, communications and industrial markets as well as power IC for the next generation computing applications.

Our business model leverages global resources, including research and development and manufacturing in the United States and Asia. Our sales and technical support teams are localized in several growing markets primarily in Asia. We operate a 200mm wafer fabrication facility located in Hillsboro, Oregon, or the Oregon fab, which enables us to accelerate proprietary technology development, new product introduction and improve our financial performance. To meet the market demand for the more mature high volume products, we also utilize the wafer manufacturing capacity of selected third party foundries. For assembly and test, we primarily rely upon our in-house facilities in China. In addition, we utilize subcontracting partners for industry standard packages. We believe our in-house packaging and testing capability provides us with a competitive advantage in proprietary packaging technology, product quality, costs and sales cycle time.

On March 29, 2016, we entered into a joint venture contract (the “JV Agreement”) with two investment funds affiliated with the municipalities of Chongqing (the “Chongqing Funds”), pursuant to which we and Chongqing Funds form a joint venture, (the “JV Company”), for the purpose of constructing a power semiconductor packaging, testing and wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company will be $330.0 million (the “Initial Capitalization”).  The Initial Capitalization will be completed in stages commencing on the incorporation of the JV Company.  We own 51%, and the Chongqing Funds own 49%, of the equity interest in the JV Company. We expect the JV company to commence its initial production in the first half of fiscal 2018. Over the

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long term, the JV Company expects to construct a 12-inch wafer fabrication facility for the production of power semiconductors.

We were incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of our registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda. Our agent for service of process in the U.S. for the purpose of our securities filings is our Chief Executive Officer, Mike F. Chang, c/o Alpha and Omega Semiconductor Incorporated, 475 Oakmead Parkway, Sunnyvale, CA 94085. Telephone number of our agent is (408) 830-9742.

We have incorporated various wholly-owned subsidiaries in different jurisdictions, and a subsidiary in which it has a controlling interest. Please refer to Exhibit 21.1 for a complete list of our subsidiaries.

Our industry

Semiconductors are electronic devices that perform a variety of functions, such as converting or controlling signals, processing data and delivering or managing power. With advances in semiconductor technology, the functionality and performance of semiconductors have generally increased over time, while size and cost have generally decreased. These advances have led to a proliferation of more complex semiconductors being used in a wide variety of consumer, computing, communications and industrial markets and have contributed to the growth of the semiconductor industry.

Analog semiconductors

The semiconductor industry is segmented into analog and digital. Analog semiconductors process light, sound, motion, radio waves and electrical currents and voltages. In contrast, digital semiconductors process binary signals represented by a sequence of ones and zeros.

As a result of these fundamental differences, the analog semiconductor industry is distinct from the digital semiconductor industry in terms of the complexity of design and the length of product cycle. Improper interactions between analog circuit elements can potentially render an electronic system inoperable. Experienced engineers engaged in the design process are necessary because computer-aided design cannot fully model the behavior of analog circuitry. Therefore, experienced analog engineers with requisite knowledge are in great demand but short supply worldwide. In addition, analog semiconductors tend to have a longer product life cycle because original design manufacturers, or ODMs and original equipment manufacturers, or OEMs typically design the analog portions of a system to span multiple generations of their products. Once designed into an application, the analog portion is rarely modified because even a slight change to the analog portion can cause unexpected interactions with other components, resulting in system instability.

Power semiconductors

Power semiconductors are a subset of the analog semiconductor sector with their own set of characteristics unique to power architecture and function. Power semiconductors transfer, manage and switch electricity to deliver the appropriate amount of voltage or current to a broad range of electronic systems and also protect electronic systems from damage resulting from excessive or inadvertent electrical charges.

Power semiconductors can be either discrete devices, which typically comprise only a few transistors or diodes, or ICs, which incorporate a greater number of transistors.  The function of power discretes is power delivery by switching, transferring or converting electricity.  Power transistors comprise the largest segment of the power discretes market. Power ICs, sometimes referred to as power management ICs, perform power delivery and power management functions, such as controlling and regulating voltage and current and controlling power discretes.

The growth of the power semiconductor market in recent years has several key drivers. The proliferation of computer and consumer electronics, such as desktop computers, notebooks, tablets, smart phones, flat panel displays and portable media players created the need for sophisticated power management to improve power efficiency and extend battery life. The evolution of these products is characterized by increased functionality, thinner or smaller form factors and decreasing prices. Our Power IC and low voltage (5V-40V) MOSFET products address this market. In the area of AC-DC power supplies for electronic equipment, data centers and servers, the market is characterized by a continuous demand for energy conservation through higher efficiency, which is driving the need for our medium voltage (40V-400V) and high voltage (500V-1000V) MOSFET products. The increased application of power semiconductors to control motors in white goods and industrial applications, is driving demand for Insulated Gate Bipolar Transistors, or IGBTs. IGBTs are also being used in renewable energy and automotive applications.

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The evolution toward smaller form factors and complex power requirements in the low voltage areas has driven further integration in power semiconductors, resulting in power ICs that incorporate the functionalities of both power management and power delivery functions in a single device. Power ICs can be implemented by incorporating all necessary power functions either on one piece of silicon or multiple silicon chips encapsulated into a single device. Additionally, the advancement in semiconductor packaging technology enables increased power density and shrinking form factors.

Power semiconductor suppliers develop and manufacture their products using various approaches which tend to fall across a wide spectrum of balancing cost savings with proprietary technology advantages. At one end of the spectrum are integrated design manufacturers, or IDMs, which own and operate the equipment used in the manufacturing process and design and manufacture products at their in-house facilities. IDMs exercise full control over the implementation of process technologies and have maximum flexibility in setting priorities for their production and delivery schedules. At the other end of the spectrum are completely-outsourced fabless semiconductor companies, which rely entirely on off-the-shelf technologies and processes provided by their manufacturing partners. These companies seek to reduce or eliminate fixed costs by outsourcing both product manufacturing and development of process technologies to third parties. The “fab-lite” model seeks to achieve the best balance between technological advancement and cost effectiveness by using a dedicated in-house technology laboratory to drive rapid new product developments, while utilizing third-party foundry capacity for mature products. This is particularly important in the development of power semiconductor products due to the unique nature of their technology. While digital technologies are highly standardized in leading foundries, power semiconductor technologies tend to be more unique as they seek to accommodate a wider range of voltage applications. Accordingly, third-party foundries, which are primarily setup for digital technologies, can be limited when it comes to the development of new power semiconductor technologies.

Our strategies

Our strategy is to advance our position as a designer, developer and global supplier of a broad portfolio of power semiconductors utilizing a fab-lite business model.

The fab-lite business model allows us to accelerate the development of our proprietary technology at our Oregon fab, bring new products to market faster, and improve our financial performance in the long run. This “fab-lite” model also provides quicker response to our customer demands, enhances relationships with strategic customers, provides flexibility in capacity management and geographic diversification of our wafer supply chain. This approach allows us to retain a higher level of control over the development and application of our proprietary process technology, thereby reducing certain operational risks and costs associated with utilizing third-party foundries.

In response to the decline of the global PC market, we continue to execute our strategies of diversifying our portfolio of products and expanding into other market segments, including the consumer, communications and industrial market segments, improving gross margin and profit by implementing cost control measures. We have been making progress in reducing our reliance on the PC market, but we are also committed to continue to support our computing business by growing bill-of-material content, expanding market share, and acquiring new customers.

We plan to further expand the breadth of our product portfolio to increase our total bill-of-materials within an electronic system and to address the power requirements of additional electronic systems. Our product portfolio currently consists of approximately 1,600 products and we have introduced over 90 new products in this past fiscal year. We will continue to leverage our expertise to further increase our product lines, including higher performance power ICs, IGBTs and high and medium voltage MOSFETs, in order to broaden our addressable market and improve our margin profile. We also believe that our increased product offerings will allow us to penetrate new end-market applications and provide us with an important competitive advantage. OEMs and ODMs generally prefer to limit their supplier base to a smaller set of vendors capable of providing a comprehensive menu of products across multiple electronic platforms.

Leverage our power semiconductor expertise to drive new technology platforms

We believe that the ever-increasing demand for power efficiency in power semiconductors requires expertise in and a deep understanding of the interrelationship among device physics, process technologies, design and packaging. We also believe that engineers with experience and understanding of these multiple disciplines are in great demand but short supply. Within this context, we believe that we are well positioned to be a leader in providing total power management solutions due to our extensive pool of experienced scientists and engineers and our strong IP portfolio. Accordingly, we intend to leverage our expertise to increase the number of power discrete technology platforms and power IC designs to expand our product offerings and deliver complete power solutions for our targeted applications.

Increase direct relationships and product penetration with OEM and ODM customers

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We have developed direct relationships with key OEMs who are responsible for branding, designing and marketing a broad array of electronic products, as well as ODMs who have traditionally been responsible for manufacturing these products. While OEMs typically focus their design efforts on their flagship products, as the industry has evolved, ODMs are increasingly responsible for designing portions, or entire systems, of the products they manufacture for the OEMs. In addition, several ODMs are beginning to design, manufacture and brand their own proprietary products which they sell directly to consumers. We intend to strengthen our existing relationships and form new ones with both OEMs and ODMs by aligning our product development efforts with their product requirements, increasing the number of our products used within their systems, and leveraging our relationships to penetrate their other products. In addition, we are refocusing our research and development efforts to respond more directly to the market demand by designing and developing new products based on feedback from our customers, which also allows us to reduce time-to-market and sales cycles.

Leverage global business model for cost-effective growth

We intend to continue to leverage our global resources and regional strengths. We will continue to deploy marketing, sales and technical support teams in close proximity to our end customers. We plan to further expand and align our technical marketing and application support teams along with our sales team to better understand and address the needs of our end customers and their end-market applications, in particular for those with the new technology platforms developed in this past year and in the future. This will assist us in identifying and defining new technology trends and products and to help us gain additional design wins. In addition, we have established a joint venture with investment funds affiliated with the municipalities of Chongqing, China for the purpose of constructing a power semiconductor packaging, testing and wafer fabrication. We expect our collaboration with Chongqing will, in the long term, reduce the cost of manufacturing our products and accelerate the development of new products, while allowing us to gain valuable access to new customers in China.

Our products    

To serve the large and diverse analog market for power semiconductors, we have created a broad product portfolio consisting of two major categories: power discretes and power ICs.

Our power discretes products consist primarily of low, medium and high voltage power MOSFETs. Our low-voltage MOSFET series is based on our proprietary technology, which offers increased efficiency and performance by reducing on-resistance and switching losses. We also introduced the compact AlphaDFN package series that has been designed to enhance power dissipation while providing protection to the chip for easier and safer handling when surface mounting. Our mid-voltage MOSFET portfolio offers high efficiency solutions for advanced telecommunications and industrial power supply applications. Our high-voltage portfolio includes our proprietary insulated-gate bipolar transistor ("IGBT") technology, which we developed highly robust and easy-to-use solutions designed for industrial motor control and white goods applications.

Our power ICs deliver power as well as control and regulate the power management variables, such as the flow of current and level of voltage. We continued to expand our EZBuck power IC family with products that feature lower on-resistance, less power consumption, small footprint and thermally enhanced packages. While we derive the majority of our revenue from the sales of power discretes products, sales of power ICs continue to gain traction during the past years.

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The following table lists our product families and the principal end uses of our products:

Product Family	Description	Product Categories within Product Type	Typical Application
Power Discretes	Low on-resistance switch used for routing current and switching voltages in power control circuits High power switches used for power circuits	DC-AC conversion AC-DC conversion Load switching Motor control Battery protection Power factor correction	Notebooks, Ultrabooks, desktop and tablet PC's, servers, flat panel displays, TVs, graphics cards, game boxes, chargers, battery packs, AC adapters, power supplies, E-bikes, motor control, smart phones and other portable devices, white goods and industrial motor drives, UPS systems, wind turbines, solar inverters and industrial welding
Power ICs	Integrated devices used for power management and power delivery	DC-DC Buck conversion DC-DC Boost conversion Smart load switching DrMOS power stage	Flat panel displays, TVs, Notebooks, Ultrabooks, servers, DVD/Blu-Ray players, set-top boxes, and networking equipment
	Analog power devices used for circuit protection and signal switching	Transient voltage protection Analog switch Electromagnetic interference filter	Notebooks, Ultrabooks, desktop PCs, tablets, flat panel displays, TVs, smartphones, and portable electronic devices

Power discrete products

Power discretes are used across a wide voltage and current spectrum, requiring them to operate efficiently and reliably under harsh conditions. Due to this wide applicability across diverse end-market applications, we market general purpose MOSFETs that are used in multiple applications as well as MOSFETs targeted for specific applications.

Our current power discrete product line includes industry standard trench MOSFETs, SRFETs, XSFET, electrostatic discharge, protected MOSFETs, high and mid-voltage MOSFETs and IGBTs.

Power IC products

In addition to the traditional monolithic or single chip design, we employ a multi-chip approach for the majority of our power ICs. This multi-chip technique leverages our proprietary MOSFET and advanced packaging technologies to offer integrated solutions to our customers. This allows us to update product portfolios by interchanging only the MOSFETs without changing the power management IC, thereby reducing the time required for new product introduction and providing optimal solutions to our customers. We believe that our power IC products improve our competitive position by enabling us to provide higher power density solutions to our end customers than our competitors.

The incorporation of both power delivery and power management functions tends to make power ICs more application specific because these two functions have to be properly matched to a particular end product. We have local technical marketing and applications engineers who closely collaborate with our end customers to help ensure that power IC specifications are properly defined at the beginning of the design stage.

New Product Introduction

We introduced several new products based on our proprietary technology platform and continue to expand our product family by introducing new solutions to computing, battery protection, and smartphone fast chargers. During the fourth quarter of fiscal year of 2016, we introduced Best-In-Class DrMOS-IV Power Modules with an EZPair™ package. The new device enables high power density voltage regulator solutions ideal for Notebook PCs, servers, and graphic cards applications. We also released 8 new products in the 60V MOSFET family during this period. These products are designed for synchronous rectification in flyback converters, used in quick chargers for smart phones and other portable devices. Moreover, we launched a second generation of Constant On-Time (COT) buck converters which provides the perfect solution for next generation

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computing chipsets that are pushing the limits of DC/DC converter size. In addition, we introduced our first 2.38 mOhm device for battery protection. This new device offers the best-in-class source-to-source on-resistance (Rsson), giving the battery protection circuit designer the lowest voltage drop and temperature rise in the protection circuit module. During the second quarter of fiscal year of 2016, we introduced the industry's first single n-channel 45V MOSFET with an ultra-low on-resistance of 1.15Ohms at 10V. This addition to our medium voltage product portfolio is designed to address a wide range of applications including secondary-side synchronous rectification in AC/DC and DC/DC converters, as well as industrial and motor drive applications. We also released AOC3864, a common-drain 20V dual n-channel MOSFET with an ultra-low on-resistance of 5.7mOhms at 4.5V. This new device offers the best approach in designing battery protection circuit modules, while providing a strong and reliable solution. In addition, we introduced the new generation of high efficiency PairFETs. The AOE6930 is an asymmetric package with integrated high-side and low-side MOSFETs. The product is designed with our latest silicon technology to optimize the conducting resistance and the switching characteristics of both MOSFETs in order to attain the highest efficiency over the whole output range when working as the power stage for a Vcore power supply circuit. The combination of AOS's XSFET™ technology in this new generation PairFET package, gives the device an extra advantage in thermal dissipation. Moreover, we released the AOZ3101, a high efficiency, simple-to-use synchronous buck regulator, with an operating input voltage range from 4.5V to 18V, supplying 2A of continuous current. The device offers a low on-resistant power stage in a thermally enhanced 3mm x 3mm DFN package, allowing cooler power conversion for a variety of consumer electronics application such as LCD TVs, set-top boxes, as well as DVD players and recorders. During the first quarter of fiscal year of 2016, we released AO4294, the latest addition to our family of high efficiency charging solutions. This new device is offered in an easy-to-use SO-8 package, which helps manufacturers keep the mounting cost low, while still getting the best efficiency and power dissipation possible. The AO4294 is an ideal solution for synchronours rectification in high efficiency chargers and adapters for mobile devices. We also released AOZ3053, a 5A EZBuck DC/DC regulator with smart mode adaption functions, available in a thermally enhanced exposed pad SO-8 package. The AOZ3053 is the first of this new smart platform, which allows for more thermally efficient DC/DC solutions for consumer, networking and industrial applications such as LCD TVs, set-top boxes, cable modems, and power supplies.

Distributors and customers     

We have developed direct relationships with key OEMs, including Dell Inc., Hewlett-Packard Company, LG Electronics, Inc. and Samsung Group, most of which we serve through our distributors and ODMs. We sell to Samsung Group directly which accounted for 12.3%, 11.7% and 11.6% of our revenue for the fiscal years ended June 30, 2016, 2015 and 2014, respectively. In addition, based on our historical design win activities, our power semiconductors are also incorporated into products sold to certain OEMs.

Through our distributors, we provide products to ODMs who traditionally are contract manufacturers for OEMs. As the industry has evolved, ODMs are increasingly responsible for designing portions, or entire systems, of the products they manufacture for the OEMs. In addition, several ODMs are beginning to design, manufacture and brand their own proprietary products, which they sell directly to consumers. Our ODM customers include Compal Electronics, Inc., Foxconn, Quanta Computer Incorporated, Pegatron,Wistron Corporation and AOC International.

In order to take advantage of the expertise of end-customer fulfillment logistics and shorter payment cycles, we sell most of our products to distributors. In general, under the agreements with our distributors, they have limited rights to return unsold merchandise, subject to time and volume limitations. As of June 30, 2016 and 2015, our two largest distributors were WPG Holdings Limited, or WPG, and Promate Electronic Co. Ltd., or Promate, respectively. Sales to WPG and Promate accounted for 37.2% and 23.8% of our revenue, respectively, for the fiscal year ended June 30, 2016, 36.1% and 25.4% of our revenue, respectively, for the fiscal year ended June 30, 2015, and 43.1% and 21.6% of our revenue, respectively, for fiscal year ended June 30, 2014, respectively.

Sales and marketing    

Our marketing division is responsible for identifying high growth markets and applications where we believe our technology can be effectively deployed. We believe that the technical background of our marketing team, including application engineers, helps us better define new products and identify potential end customers and geographic and product market opportunities. For example, as part of our market diversification strategy, we have deployed and plan to recruit more for our new market segments, field application engineers, or FAEs, who provide real-time and on-the-ground responses to our end customer needs, work with our end customers to understand their requirements, resolve technical problems, strive to anticipate future customer needs and facilitate the design-in of our products into the end products of our customers. We believe this strategy increases our share of revenue opportunities within the applications we currently serve, as well as in new end-market applications.

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Our sales team consisted of sales persons, field application engineers, customer service representatives and customer quality engineers who are responsible for key accounts. We strategically position our team near our end customers through our offices in Taipei, Hong Kong, Shenzhen, Shanghai, Tokyo, Seoul and Sunnyvale, California, complemented by our applications centers in Sunnyvale and Shanghai. In addition, our distributors and sales representatives assist us in our sales and marketing efforts by identifying potential customers, sourcing additional demand and promoting our products, in which case we may pay a sales commission to these distributors.

Our sales cycle varies depending on the types of products and can range from six to eighteen months.  In general, our traditional power discrete products in the PC and TV applications are moving more rapidly through the design and marketing processes, therefore they generally have shorter sales cycle.  In contrast, our newer Power IC and IGBT products, mostly in the power supply, home appliance and industrial applications, require a more extended design and marketing timeline and thus have longer sales cycle.  Typically, our sales cycle for all products comprises of the following steps:

• identification of a customer design opportunity;

• qualification of the design opportunity by our FAEs through comparison of the power requirements against our product portfolio;

• provision of a product sample to the end customer to be included in the customer's pre-production model with the goal of being included in the final bill of materials; and

• placement by the customer, or through its distributor, of a full production order as the end customer increases to full volume production.

Competition

The power semiconductor industry is characterized by fragmentation with many competitors. We compete with different power semiconductor suppliers, depending on the type of product lines and geographical area. Our key competitors in power discretes and power ICs are primarily headquartered in the United States, Japan, Europe and Taiwan. Our major competitors in power discretes include Fairchild Semiconductor International, Inc., Infineon Technologies AG, MagnaChip Semiconductor Corporation, ON Semiconductor Corp., STMicroelectronics N.V., Toshiba Corporation, Diodes Incorporated and Vishay Intertechnology, Inc. Our major competitors for our power ICs include Global Mixed-mode Technology Inc., Monolithic Power Systems, Inc., Richtek Technology Corp., Semtech Corporation and Texas Instruments Inc.

Our ability to compete depends on a number of factors, including:

• our success in expanding and diversifying our serviceable markets, and our ability to develop technologies and product solutions for these markets;

• our capability in quickly developing and introducing proprietary technology and best in class products;

• the performance and cost-effectiveness of our products relative to that of our competitors;

• our ability to manufacture, package and deliver products in large volume on a timely basis at a competitive price;

• our success in utilizing new and proprietary technologies to offer products and features previously not available in the marketplace;

• our ability to recruit and retain analog semiconductor designers and application engineers; and

• our ability to protect our intellectual property.

Some of our competitors have longer operating histories, more brand recognition, and significantly greater financial, technical, research and development, sales and marketing, manufacturing and other resources. However, we believe that we can compete effectively through our integrated and innovative technology platform and design capabilities, including our multi-chip approach to power IC products, strategic global business model, expanding portfolio of products, diversified and broad customer base, and excellent on-the-ground support and quick time to market for our products.

Seasonality    

As we provide power semiconductors used in consumer electronic products, our business is subject to seasonality. Our sales seasonality is affected by a number of factors, including global and regional economic conditions as well as the PC market

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conditions, revenue generated from new products, changes in distributor ordering patterns in response to channel inventory adjustments and end customer demand for our productsand fluctuations in consumer purchase patterns prior to major holiday seasons. In recent periods, broad fluctuations in the semiconductor markets and the global and regional economic conditions, in particular the decline of the PC market conditions, have had a more significant impact on our results of operations than seasonality, and have made it difficult to assess the impact of seasonal factors on our business.

Backlog        

Our sales are made primarily pursuant to standard purchase orders from distributors and direct customers. The amount of backlog to be shipped during any period depends on various factors, and all orders are subject to cancellation or modification, usually with no penalty to customers. The quantities actually purchased by customers, as well as shipment schedules, are frequently revised to reflect changes in both the customers' requirements and in manufacturing availability. Therefore, our backlog at any point in time is not a reliable indicator of our future revenue.

Research and development    

Because we view technology as a competitive advantage, we invest significant time and capital into research and development to address the technology intensive needs of our end customers. Our research and development expenditures for the fiscal years of 2016, 2015 and 2014 were $26.0 million, $27.1 million and $24.4 million, respectively. Our research and development expenditures primarily consist of staff compensation, prototypes, engineering materials, simulation and design tools and test and analyzer equipment. Our new product development efforts continue to focus on developing products with higher speed, higher efficiency and reliability, higher power density, greater performance and lower costs. We have research and development teams in Silicon Valley (Sunnyvale, California), Oregon, Taipei, Taiwan, and Shanghai, China. We believe that these diverse research and development teams enable us to develop leading edge technology platforms and new products. Our areas of research and development focus include:

Packaging technologies: Consumer demand for smaller and more compact electronic devices with higher power density is driving the need for advanced packaging technology. Our group of dedicated packaging engineers focuses on smaller form factor, higher power output with efficient heat dissipation and cost-effectiveness. We have invested significant resources to develop and enhance our proprietary packaging technologies, including the establishment of our in-house packaging and testing facilities. We believe that our efforts to develop innovative packaging technologies will continue to provide new and cost-effective solutions with higher power density to our customers. During the fiscal year ended June 30, 2016, we continued our diversification program by developing new silicon and packaging platforms to expand our SAM and offer higher performance products.

Process technology and device physics: We focus on specialized process technology in the manufacturing of our products, including vertical DMOS, Shielded Gate Trench, Trench field stop IGBTs, charge-balance high voltage MOSFETs, Schottky Diode and BCDMOS processes. Our process engineers work closely with our design team to deploy and implement our proprietary manufacturing processes at our Oregon fab as well as the third-party foundries that fabricate our wafers. To improve our process technology, we continue to develop and enhance our expertise in device physics in order to better understand the physical characteristics of materials and the interactions among these materials during the manufacturing process.

New products and new technology platforms: We also invest significantly in the development of new technology platforms and introduction of new products. Because power management affects all electronic systems, we believe that developing a wide portfolio of products enables us to target new applications in addition to expanding our share of power management needs served within existing applications.

As a technology company, we will continue our significant investment in research and development in our low voltage and high voltage power discretes and power ICs by developing new technology platforms and new products that allow for better product performance, more efficient packages and higher levels of integration.

Operations    

The manufacture of our products is divided into two major steps: wafer fabrication and packaging and testing.

Wafer fabrication

Our Oregon fab allows us to accelerate the development of our technology and products, as well as to provide better services to our customers. We allocate our wafer production between our in-house facility and third-party foundries, although

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in the past three years, we have gradually reduced our reliance on third-party foundries following the acquisition and integration of the Oregon fab. Currently our main third-party foundry is Shanghai Hua Hong Grace Electronic Company Limited, ("HHGrace"), or formerly HHNEC, located in Shanghai. HHGrace has been manufacturing wafers for us since 2002. HHGrace manufactured 25.0%, 25.0% and 28.6% of the wafers used in our products for the fiscal years ended June 30, 2016, 2015 and 2014, respectively.

On March 29, 2016, we entered into the JV agreement with two investment funds affiliated with the municipalities of Chongqing for the purpose of constructing a power semiconductor packaging, testing and 12-inch wafer fabrication facility in the Liangjiang New Area of Chongqing. We expect the JV Company to commence its initial production in the first half of fiscal 2018.

Packaging and testing

Completed wafers from the foundries are sent to our in-house packaging and testing facilities or to our subcontractors, where the wafers are cut into individual die, soldered to lead frames, wired to terminals and then encapsulated in protective packaging. After packaging, all devices are tested in accordance with our specifications and substandard or defective devices are rejected. We have established quality assurance procedures that are intended to control quality throughout the manufacturing process, including qualifying new parts for production at each packaging facility, conducting root cause analysis, testing for lots with process defects and implementing containment and preventive actions. The final tested products are then shipped to our distributors or customers.

Our in-house packaging and testing facilities are located in Shanghai, China which handle most of our packaging and testing requirements for our products, and within one year from June 30, 2016, we are expected to contribute a portion of the packaging equipments currently being used in Shanghai facility to the JV Company. We continuously increase outsourcing portion of our packaging and testing requirements to other contract manufacturers to minimize the effect of market fluctuation. Our facilities have the combined capacity to package and test over 500 million parts per month and have available floor space for new package introductions. We believe our ability to package and test our products internally represents a strategic advantage as it protects our proprietary packaging technology, increases the rate of new package introductions, reduces operating expenses and ultimately improves our profit margins.

Quality assurance    

Our quality assurance practices aim to consistently provide our end customers with products that are reliable, durable and free of defects. We strive to do so through continuous improvement in our product design and manufacturing and close collaboration with our manufacturing partners. Our manufacturing operations in China and our manufacturing facility in Oregon are certified to the ISO9001 and ISO/TS16949:2009. These Quality Management System certifications are in recognition of our quality assurance standards. Both ISO9001and ISO/TS16949:2009 are sets of criteria and procedures established by International Organization of Standardization for developing a fundamental quality management system and focusing on continuous improvement, defect prevention and the reduction of variation and waste. Our products are also in compliance with Restrictions on the use of Hazardous Substances, or RoHS 2.0.

We maintain a supplier management and process engineering team in Shanghai that works with our third-party foundries and packaging and testing subcontractors to monitor the quality of our products, which is designed to ensure that manufacturing of our products, is in strict compliance with our process control, monitoring procedures and product requirements. We also conduct periodic reviews and annual audits to ensure supplier performance. For example, we examine the results of statistical process control systems, implement preventive maintenance, verify the status of quality improvement projects and review delivery time metrics. In addition, we rate and rank each of our suppliers every quarter based on factors such as their quality and performance. Our facility in Oregon integrates manufacturing process controls through our manufacturing execution system coupled with wafer process controls that include monitoring procedures, preventative maintenance, statistical process control, and testing to ensure that finished wafers delivered will meet and exceed quality and reliability requirements. All materials used to manufacture wafers are controlled through a strict qualification process.

Our manufacturing processes use many raw materials, including silicon wafers, gold, copper, molding compound, petroleum and plastic materials and various chemicals and gases. We obtain our raw materials and supplies from a large number of sources. Although supplies for the raw materials used by us are currently adequate, shortages could occur in various essential materials due to interruption of supply or increased demand in the industry.

Intellectual property rights     

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Intellectual property is a critical component of our business strategy, and we intend to continue to invest in the growth, maintenance and protection of our intellectual property portfolio. We own significant intellectual property in many aspects of power semiconductor technology, including device physics and structure, wafer processes, circuit designs, packaging, modules and subassemblies. We have also entered into intellectual property licensing agreements with other companies, including Fairchild Semiconductor International, Inc. and Giant Semiconductor Corporation, to use selected third-party technology for the development of our products, although we do not believe our business is dependent to any significant degree on any individual third-party license agreement.

While we focus our patent efforts in the United States, we file corresponding foreign patent applications in other jurisdictions, such as China and Taiwan, when filing is justified by cost and strategic importance. The patents are increasingly important to remain competitive in our industry, and a strong patent portfolio will facilitate the entry of our products into new markets. As of June 30, 2016, we had 601 patents issued in the United States, of which 29 were acquired, 2 were licensed and 570 were based on our research and development efforts, and these patents are set to expire between 2016 and 2035. Within these patents, 6 patents will be expired in 2016, which we do not expect to have a material impact on our patent position. We also had a total of 611 foreign patents, including 283 Chinese patents, 307 Taiwanese patents, 13 Korean patents, 4 Hong Kong patents and 4 Japanese patents as of June 30, 2016. Substantially all of our foreign patents were based on our research and development efforts. These foreign patents expire in the years between 2018 and 2035. In addition, as of June 30, 2016, we had a total of 359 patent applications, of which 150 patents were pending in the United States, 125 patents were pending in China, 79 patents were pending in Taiwan and 4 patents were pending in other countries.

As our technologies are deployed in new applications and as we diversify our product portfolio based on new technology platforms, we may be subject to new potential infringement claims. Patent litigation, if and when instituted against us, could result in substantial costs and a diversion of our management's attention and resources. However, we are committed to vigorously defending and protecting our investment in our intellectual property. Therefore, the strength of our intellectual property program, including the breadth and depth of our portfolio, will be critical to our success in the new markets we intend to pursue.

In addition to patent protection, we also rely on a combination of trademark, copyright (including mask work protection), trade secret laws, contractual provisions and similar laws in other jurisdictions. We also enter into confidentiality and invention assignment agreements with our employees, consultants, suppliers, distributors and customers and seek to control access to, and distribution of, our proprietary information.

Environmental matters    

The semiconductor production process, including the semiconductor wafer manufacturing and packaging process, generates air emissions, liquid wastes, waste water and other industrial wastes. We have installed various types of pollution control equipment for the treatment of air emissions and liquid waste and equipment for recycling and treatment of water in our packaging and testing facilities in China and wafer manufacturing facility in Oregon, USA. Waste generated at our manufacturing facilities, including but not limited to acid waste, alkaline waste, flammable waste, toxic waste, oxide waste and self-igniting waste, is collected and sorted for proper disposal. Our operations in China are subject to regulation and periodic monitoring by China's State Environmental Protection Bureau, as well as local environmental protection authorities, including those under the Shanghai Municipal Government, which may in some cases establish stricter standards than those imposed by the State Environmental Protection Bureau. Our operation in Oregon is subject to Oregon Department of Environmental Regulations, Federal Environmental Protection Agency laws and regulations, and local jurisdictional regulations. We believe that we have been in material compliance with applicable environmental regulations and standards and have not had a material or adverse effect on our results of operations from complying with these regulations.

We have implemented an ISO 14001 environmental management system in our manufacturing facilities in China and Oregon. We also require our subcontractors, including foundries and assembly houses, to meet ISO14001 standards. We believe that we have adopted pollution control measures for the effective maintenance of environmental protection standards consistent with the requirements applicable to the semiconductor industry in China and the U.S..

Our products sold in Europe are subject to RoHS in Electrical and Electronic Equipment, which requires that the products do not contain more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl and polybrominated diphenyl ether flame retardants. Our manufacturing facilities in China also obtained QC080000 certification, which is an IECQ Certificate of Conformity Hazardous Substance Process Management for European Directive 2002/95/EC requirements and a Certificate of Green Partner for Sony Green Partner Program. We avoid using these restricted materials to the extent possible when we design our products.

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We are also subject to SEC rules that require diligence, disclosure and reporting on whether certain minerals and metals, known as conflict minerals, used in our products originate from the Democratic Republic of Congo and adjoining countries. As of June 30, 2016, 2015 and 2014, we were in compliance with the related conflict minerals rule.

Employees    

As of June 30, 2016, we had approximately 2,800 employees, of which approximately 380 were located in the United States, 2,310 were located in China, and 110 were located in other parts of Asia. Of the total employees, approximately 2,380 were in operations and manufacturing, 150 were in research and development, 150 were in sales and marketing and 120 were in general and administrative. None of our employees are represented by a collective bargaining agreement. We consider our relationships with our employees to be good.

Executive Officers     

The following table lists the names, ages and positions of our executive officers as of July 31, 2016. There are no family relationships between any executive officer.

Name	Age	Position
Mike F. Chang, Ph.D.	71	Chairman of the Board and Chief Executive Officer
Yueh-Se Ho, Ph.D.	64	Director and Chief Operating Officer
Yifan Liang	52	Chief Financial Officer and Corporate Secretary
Daniel Kuang Ming Chang	61	Senior Vice President of Marketing

Mike F. Chang, Ph.D., is the founder of our company and has served as our Chairman of the Board and Chief Executive Officer since the incorporation of our company. Dr. Chang has extensive experience in both technology development and business operations in the power semiconductor industry. Prior to establishing our company, Dr. Chang served as the Executive Vice President at Siliconix Incorporated, a subsidiary of Vishay Intertechnology Inc., a global manufacturer and supplier of discrete and other power semiconductors, or Siliconix, from 1998 to 2000. Dr. Chang also held various management positions at Siliconix from 1987 to 1998. Earlier in his career, Dr. Chang focused on product research and development in various management positions at General Electric Company from 1974 to 1987. Dr. Chang received his B.S. in electrical engineering from National Cheng Kung University, Taiwan, and M.S. and Ph.D. in electrical engineering from the University of Missouri.

Yueh-Se Ho, Ph.D., is a co-founder of our company and has served as our Chief Operating Officer since January 2006 and our director since March 2006. Dr. Ho has held various operational management positions in our company since our inception, including the Vice President of Worldwide Operations from 2003 to 2006 and the Vice President of Back End Operations from 2000 to 2003. Prior to co-founding our company, Dr. Ho served as the Director of Packaging Development and Foundry Transfer at Siliconix from 1998 to 2000. Dr. Ho received his B.S. in chemistry from Tamkang University, Taiwan, and Ph.D. in chemistry from the University of Pittsburgh.

Yifan Liang is currently serving as our Chief Financial Officer since August 2014 and Corporate Secretary since November 2013. Mr. Liang served as our Interim Chief Financial Officer from November 2013 to August 2014, our Chief Accounting Officer since October 2006, and our Assistant Corporate Secretary from November 2009 to November 2013. Mr. Liang joined our company in August 2004 as our Corporate Controller. Prior to joining us, Mr. Liang held various positions at PricewaterhouseCoopers LLP, or PwC, from 1995 to 2004, including Audit Manager in PwC's San Jose office. Mr. Liang received his B.S. in management information system from the People's University of China and M.A. in finance and accounting from the University of Alabama.

Daniel Kuang Ming Chang has been serving as our Senior Vice President of Marketing since August 3, 2015.  Mr. Chang served as our Vice President of Power IC Product Line and Applications Engineering from October 2011 to August 2, 2015, our Vice President of Strategic Marketing and Applications Engineering from May 2010 to October 2011, and our Director of Strategic Marketing and Applications Engineering from February 2009 to April 2010.  Prior to joining our company, Mr. Chang served as Vice President of new product line at Richtek Inc, a power management company in Taiwan, from 2005 to 2009.  He also served as Vice President of System Engineering at Lovoltech Inc, a startup semiconductor company in Sunnyvale, California from 2001 to 2005.  Mr. Chang received his M.S. in physics from National Tsing Hua University of Taiwan, and a B.S. in electrical engineering from Taiwan National University.

Available Information

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Our filing documents and information with the Securities and Exchange Commission (the "SEC") are available free of charge electronically through our Internet website, www.aosmd.com. as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Additionally, these filings may be obtained by visiting the Public Reference Room of the SEC at 100 F Street, NE, Washington, DC 20549 or by calling the SEC at 1-800-SEC-0330, by sending an electronic message to the SEC at publicinfo@sec.gov. In addition, the SEC maintains a website (www.sec.gov) that contains reports, proxy statements, and other information that we file electronically.

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Item 1A. Risk Factors

Risks Related to Our Business

The decline of personal computing (“PC”) markets may have a material adverse effect on our results of operations.

A significant amount of our revenue is derived from sales of products in the PC markets such as notebooks, motherboards and notebook battery packs.  Our revenue from the PC markets accounted for approximately 38.5%, 47.1% and 45.2% of our total revenue for the years ended 2016, 2015 and 2014, respectively. The increasing popularity of smaller, mobile computing devices such as tablets and smartphones with touch interfaces is rapidly changing the PC markets both in the United States and abroad.  We experienced a significant reduction in the demand for our products due to the declining PC markets, which have negatively impacted our revenue, profitability and gross margin. The decline of the PC markets also adversely affected our ability to adjust inventory levels in response to the lower shipments, which have negatively impacted our gross margins. Moreover, the continuing decline of the PC markets may reduce the capacity utilization of our manufacturing facilities or impair the value of our long-lived assets, including equipment and machinery used for the manufacturing and packaging of our products, which could have a material adverse effect on our results of operations.

Our diversification into different market segments may not succeed according to our expectations and may expose us to new risks and place significant strains on our management, operational, financial and other resources.

As part of the growth strategy to diversify our product portfolio and in response to the rapid decline of the PC markets, we have been developing new technologies and products designed to penetrate into other markets and applications, including merchant power supplies, flat panel TVs, smart phones, tablets, gaming consoles, lighting, datacom, home appliances and industrial motor controls. However, there is no guarantee that these diversification efforts will be successful. As a new entrant to some of these markets, we may face intense competition from existing and more established providers and encounter other unexpected difficulties, any of which may hinder or delay our efforts to achieve success. In addition, our new products may have long design and sales cycles, therefore if our diversification efforts fail to keep pace with the declining PC markets, we may not be able to alleviate its negative impact on our results of operations.

Our diversification into different market segments may place a significant strain on our management, operational, financial and other resources. To manage this diversification effectively, we will need to take various actions, including:

• enhancing management information systems, including forecasting procedures;

• further developing our operating, administrative, financial and accounting systems and controls;

• managing our working capital and sources of financing;

• maintaining close coordination among our engineering, accounting, finance, marketing, sales and operations organizations;

• retaining, training and managing our employee base;

• enhancing human resource operations and improving employee hiring and training programs;

• realigning our business structure to more effectively allocate and utilize our internal resources;

• improving and sustaining our supply chain capability; and

• managing both our direct and distribution sales channels in a cost-efficient and competitive manner.

Our failure to execute any of the above actions successfully or timely may have an adverse effect on our business and financial results.

Our operating results may fluctuate from period to period due to many factors, which may make it difficult to predict our future performance.

Our periodic operating results may fluctuate as a result of a number of factors, many of which are beyond our control. These factors include, among others:

• a deterioration in general demand for electronic products, particularly the Personal Computing (PC) market, as a result of global or regional financial crises and associated macro-economic slowdowns, and/or the cyclicality of the semiconductor industry;

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• a deterioration in business conditions at our distributors and /or end customers;

• adverse general economic conditions in the countries where our products are sold or used;

• the emergence and growth of markets for products we are currently developing;

• our ability to successfully develop, introduce and sell new or enhanced products in a timely manner and the rate at which our new products replace declining orders for our older products;

• the anticipation, announcement or introduction of new or enhanced products by us or our competitors;

• the amount and timing of operating costs and capital expenditures, including expenses related to the maintenance and expansion of our business operations and infrastructure;

• the announcement of significant acquisitions, disposition or partnership arrangements and changes in our joint venture project in China;

• changes in the utilization of our in-house manufacturing capacity;

• supply and demand dynamics and the resulting price pressure on the products we sell;

• the unpredictable volume and timing of orders, deferrals, cancellations and reductions for our products, which may depend on factors such as our end customers' sales outlook, purchasing patterns and inventory adjustments based on general economic conditions or other factors;

• changes in the selling prices of our products and in the relative mix in the unit shipments of our products, which have different average selling prices and profit margins;

• changes in costs associated with manufacturing of our products, including pricing of wafer, raw materials and assembly services;

• announcement of significant share repurchase programs;

• our concentration of sales in consumer applications and changes in consumer purchasing patterns and confidence; and

• the adoption of new industry standards or changes in our regulatory environment;

Any one or a combination of the above factors and other risk factors described in this section may cause our operating results to fluctuate from period to period, making it difficult to predict our future performance. Therefore, comparing our operating results on a period-to-period basis may not be meaningful, and you should not rely on our past results as an indication of our future performance.

Our revenue may fluctuate significantly from period to period due to ordering patterns from our distributors and seasonality.

Demand for our products from our end customers fluctuates depending on their sales outlooks and market and economic conditions. Accordingly, our distributors place purchase orders with us based on their forecasts of end customer demand. Because these forecasts may not be accurate, channel inventory held at our distributors may fluctuate significantly due to the difference between the forecasts and actual demand. As a result, distributors adjust their purchase orders placed with us in response to changing channel inventory levels, as well as their assessment of the latest market demand trends. A significant decrease in our distributors' channel inventory in one period may lead to a significant rebuilding of channel inventory in subsequent periods, or vice versa, which may cause our quarterly revenue and operating results to fluctuate significantly.

In addition, because our power semiconductors are used in consumer electronics products, our revenue is subject to seasonality. Our sales seasonality is affected by a number of factors, including global and regional economic conditions as well as the PC market conditions, revenue generated from new products, changes in distributor ordering patterns in response to channel inventory adjustments and end customer demand for our productsand fluctuations in consumer purchase patterns prior to major holiday seasons. In recent year, broad fluctuations in the semiconductor markets and the global economic conditions, in particular the decline of the PC market conditions, have had a more significant impact on our results of operations, than seasonality, and have made it difficult to assess the impact of seasonal factors on our business.

If we are unable to introduce or develop new and enhanced products that meet or are compatible with our customer's product requirements in a timely manner, it may harm our business, financial position and operating results.

Our success depends upon our ability to develop and introduce new and enhanced products that meet or are compatible with our customer's specifications, performance standards and other product requirements in a timely manner. The development of new and enhanced products involves highly complex processes, and at times we have experienced delays in the introduction of new products. Successful product development and introduction of new products depends on a number of

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factors, including the accurate product specification; timely completion of design; achievement of manufacturing yields; timely response to changes in customers' product requirements; quality and cost-effective production; and effective marketing. Since many of our products are designed for specific applications, we must frequently develop new and enhanced products jointly with our customers. In the past, we have encountered product compatibility issues with a major OEM that has negatively impacted our financial results, and although we have resolved fully such issues with the OEM, there is no guarantee that the same compatibility issues will not occur in the future with other OEMS. If we are unable to develop or acquire new products that meet or are compatible with our customer's specification and other product requirements in a timely manner, we may lose revenue or market shares with our customers, which could have a material adverse effect on our business, financial position and operating results.

We may not win sufficient designs, or our design wins may not generate sufficient revenue for us to maintain or expand our business.

We invest significant resources to compete with other power semiconductor companies to obtain winning competitive bids for our products in selection processes, known as “design wins.” Our effort to obtain design wins may detract us from or delay the completion of other important development projects, impair our relationships with existing end customers and negatively impact sales of products under development. In addition, we cannot be assured that these efforts would result in a design win, that our product would be incorporated into an end customer's initial product design, or that any such design win would lead to production orders and generate sufficient revenue. Furthermore, even after we have qualified our products with a customer and made sales, subsequent changes to our products, manufacturing processes or suppliers may require a new qualification process, which may result in delay and excess inventory. If we cannot achieve sufficient design wins in the future, or if we fail to generate production orders following design wins, our ability to grow our business and improve our financial results will be harmed.

We may not be able to fully realize the anticipated benefits and advantages from our joint venture with the Chongqing government.

In March 2016, we entered into a joint venture contract (the “JV Agreement”) with two investment funds owned by the municipalities of Chongqing, China (the “Chongqing Funds”), pursuant to which we and the Chongqing Funds formd a joint venture (the “JV Company”) for the purpose of constructing a power semiconductor packaging/testing and wafer fabrication facility. The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which consists of (i) a total of $ 162.0 million of cash contribution from the Chongqing Funds; (ii) $74.0 million of existing packaging and testing equipment owned by us located in Shanghai, China; (iii) certain intellectual property rights, including patents, held by us relating to the manufacturing technology valued at $84.0 million; and (iv) $10.0 million of cash contribution by us.  We own 51%, and the Chongqing Funds owns 49%, of the equity interest in the JV Company. The Initial Capitalization will be completed in stages and we expect the JV Company to commence its initial production in the first half of fiscal 2018.

We may encounter unanticipated difficulties and obstacles that may delay or prevent the commencement of the JV Company's operation, some of which are outside of our control. These difficulties may include unexpected costs in transferring our assembly and testing operations to the new facility; inability to coordinate and integrate the labor forces; delays in obtaining the necessary Chinese government approval to establish the joint venture; failure of the Chongqing Funds to meet their obligations under the JV Agreement; and inability to provide customers with required services. In addition, we may not be able to fully utilize our packaging and testing capacity during the period when our facilities are being transferred from Shanghai to Chongqing, which may negatively impact our business and results of operations.

Even if the joint venture is able to commence operation, we may not fully realize the anticipated benefits of the project, such as cost savings, improvement in working capital, increased gross margin, revenue and profitability, enhanced market share for our products; and increased diversification of our products and customers.  The establishment and operation of a new manufacturing facility involve significant risks and challenges, including, but are not limited to, the following:

• Inability to gain or sustain sufficient new customers and market shares to offset the additional costs of building and operating a new facility;

• Lack of sufficient control over the operation and finances of the joint venture;

• Insufficient personnel with requisite expertise and experiences to operate a 12-in fabrication facility;

• Inability to fully integrate the joint venture with our existing fabrication facility in Oregon, and inability to fully utilize both fabrication facilities;

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• Failure of Chongqing Funds to meet its obligations under the JV Agreement;

• Difficulties in protecting and enforcing our intellectual property rights;

• Difficulties in maintaining international communications and coordination between our locations in the U.S. and China;

• Inability to take advantage of the expected tax savings;

• Changes or uncertainties in economic, legal, regulatory, social and political conditions in China, and lack of transparency and certainty in the Chinese regulatory process;

• Labor disputes and difficulties in recruiting new employees; and

• Additional costs and complexity with compliance of local and state regulations of Chongqing. 

Any of the foregoing risks could materially reduce the expected return of our investment in the joint venture and adversely affects our business operations, financial performance and the trading price of our shares.

Our success depends upon the ability of our OEM end customers to successfully sell products incorporating our products.

The consumer end markets, in particular the PC market, in which our products are used are highly competitive. Our OEM end customers may not successfully sell their products for a variety of reasons, including:

• general global and regional economic conditions;

• late introduction or lack of market acceptance of their products;

• lack of competitive pricing;

• shortage of component supplies;

• excess inventory in the sales channels into which our end customers sell their products;

• changes in the supply chain; and

• changes as a result of regulatory restrictions applicable to China-exported products.

Our success depends on the ability of our OEM end customers to sell their products incorporating our products. In addition, we have expanded our business model to include more OEMs in our direct customer base. The failure of our OEM end customers to achieve or maintain commercial success for any reason could harm our business, results of operations, and financial condition and prospects.

The operation of our Oregon fab may subject us to additional risks and the need for additional capital expenditures which may negatively impact our results of operations.

The operation of the Oregon fab requires significant fixed manufacturing cost. In order to manage the capacity of the wafer fabrication facility efficiently, we must perform a forecast of long-term market demand and general economic conditions for our products. Because market conditions may vary significantly and unexpectedly, our forecast may change significantly at any time, and we may not be able to make timely adjustments to our fabrication capacity in response to these changes. During periods of continued decline in market demand, in particular the decline of the PC market, we may not be able to absorb the excess inventory and additional costs associated with operating the facility at higher capacity, which may adversely affect our operating results. Similarly, during periods of unexpected increase in customer demand, we may not be able to ramp up production quickly to meet these demands, which may lead to the loss of significant revenue opportunities. The manufacturing processes of a fabrication facility are complex and subject to interruptions. We may experience production difficulties, including lower manufacturing yields or products that do not meet our or our customers' specifications, and problems in ramping production and installing new equipment. These difficulties could result in delivery delays, quality problems and lost revenue opportunities. Any significant quality problems could also damage our reputation with our customers and distract us from the development of new and enhanced product which may have a significant negative impact on our financial results.

In addition, semiconductor manufacturing has historically required an upgrading of process technology from time to time to remain competitive, as new and enhanced semiconductor processes are developed which permit smaller, more efficient and more powerful semiconductor devices. Accordingly, we may have to make substantial capital expenditures and install significant production capacity at our in-house fabrication facility to support new technologies and increased production volume, which may cause delay in our ability to deliver new products or negatively impact our results of operations.

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Defects and poor performance in our products could result in loss of customers, decreased revenue, unexpected expenses and loss of market share, and we may face warranty and product liability claims arising from defective products.

Our products are complex and must meet stringent quality requirements. Products as complex as ours may contain undetected errors or defects, especially when first introduced or when new versions are released. Errors, defects or poor performance can arise due to design flaws, defects in raw materials or components or manufacturing anomalies, which can affect both the quality and the yield of the product. It can also be potentially dangerous as defective power components, or improper use of our products by customers, may lead to power overloads, which could result in explosion or fire. As our products become more complex, we face higher risk of undetected defects, because our testing protocols may not be able to fully test the products under all possible operating conditions. In the past, we have experienced defects in our products and these products were returned to us and subsequently scrapped or sold at a discount. Any actual or perceived errors, defects or poor performance in our products could result in the replacement or recall of our products, shipment delays, rejection of our products, damage to our reputation, lost revenue, diversion of our engineering personnel from our product development efforts in order to address or remedy any defects and increases in customer service and support costs, all of which could have a material adverse effect on our business and operations.

Furthermore, as our products are typically sold at prices much lower than the cost of the equipment or other devices incorporating our products, any defective, inefficient or poorly performing products, or improper use by customers of power components, may give rise to warranty and product liability claims against us that exceed any revenue or profit we receive from the affected products. Historically, we have received claims from our customers for charges such as their labor and other costs replacing defective parts, their lost profit, and/or penalty. We could incur significant costs and liabilities if we are sued and if damages are awarded against us. There is no guarantee that our insurance policies will be available or adequate to protect against such claims. Costs or payments we may make in connection with warranty and product liability claims or product recalls may adversely affect our financial condition and results of operations.

If we do not forecast demand for our products accurately, we may experience product shortages, delays in product shipment, excess product inventory, or difficulties in planning expenses, which will adversely affect our business and financial condition.

We manufacture our products according to our estimates of customer demand. This process requires us to make numerous forecasts and assumptions relating to the demand of our end customers, channel inventory, and general market conditions. Because we sell most of our products to distributors, who in turn sell to our end customers, we have limited visibility as to end customer demand. Furthermore, we do not have long-term purchase commitments from our distributors or end customers, and our sales are generally made by purchase orders that may be cancelled, changed or deferred without notice to us or penalty. As a result, it is difficult to forecast future customer demand to plan our operations.

The utilization of our manufacturing facilities and the provisions for inventory write-downs are important factors in our profitability. If we overestimate demand for our products, or if purchase orders are canceled or shipments delayed, we may have excess inventory, which may result in adjustments to our production plans. These adjustments to our productions may affect the utilization of our own wafer fabrication and packaging facilities. If we cannot sell certain portion of the excess inventory, it will affect our provisions for inventory write-downs. Our inventory write-down provisions are subject to adjustment based on events that may not be known at the time the provisions are made, and such adjustments could be material and impact our financial results negatively.

If we underestimate demand, we may not have sufficient inventory to meet end-customer demand, and we may lose market share and damage relationships with our distributors and end customers and we may have to forego potential revenue opportunities. Obtaining additional supply in the face of product shortages may be costly or impossible, particularly in the short term, which could prevent us from fulfilling orders in a timely manner or at all.

In addition, we plan our operating expenses, including research and development expenses, hiring needs and inventory investments, base in part on our estimates of customer demand and future revenue. If customer demand or revenue for a particular period is lower than we expect, we may not be able to proportionately reduce our fixed operating expenses for that period, which would harm our operating results.

We face intense competition and may not be able to compete effectively which could reduce our revenue and market share.

The power semiconductor industry is highly competitive and fragmented. If we do not compete successfully against current or potential competitors, our market share and revenue may decline. Our main competitors are primarily headquartered in the United States, Japan, Taiwan and Europe. Our major competitors for our power discretes include Fairchild Semiconductor International, Inc., Infineon Technologies AG, MagnaChip Semiconductor Corporation, ON

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Semiconductor Corp., STMicroelectronics N.V., Toshiba Corporation, Diodes Incorporated and Vishay Intertechnology, Inc. Our major competitors for our power ICs include Global Mixed-mode Technology Inc., Monolithic Power Systems, Inc., Richtek Technology Corp., Semtech Corporation and Texas Instruments Inc.

We expect to face competition in the future from our competitors, other manufacturers, designers of semiconductors and start-up semiconductor design companies. Many of our competitors have competitive advantages over us, including:

• significantly greater financial, technical, research and development, sales and marketing and other resources, enabling them to invest substantially more resources than us to respond to the adoption of new or emerging technologies or changes in customer requirements;

• greater brand recognition and longer operating histories;

• larger customer bases and longer, more established relationships with distributors or existing or potential end customers, which may provide them with greater reliability and information regarding future trends and requirements that may not be available to us;

• the ability to provide greater incentives to end customers through rebates, and marketing development funds or similar programs;

• more product lines, enabling them to bundle their products to offer a broader product portfolio or to integrate power management functionality into other products that we do not sell; and

• captive manufacturing facilities, providing them with guaranteed access to manufacturing facilities in times of global semiconductor shortages.

If we are unable to compete effectively for any of the foregoing or other reasons, our business, results of operations, and financial condition and prospects will be harmed.

We depend partly on third-party semiconductor foundries to manufacture our products and implement our fabrication processes, and any failure to maintain sufficient foundry capacity and control the cost of production could significantly delay our ability to ship our products, damage our relationships with customers, reduce our sales and increase expenses.

The allocation of our wafer production between in-house facility and third-party foundries may fluctuate from time to time. We expect to continue to rely in part on third party foundries to meet our wafer requirements. Although we use several independent foundries, our primary third-party foundry is HHGrace, which manufactured 25.0%, 25.0% and 28.6% of the wafers used in our products for the fiscal years ended June 30, 2016, 2015 and 2014, respectively.

We place our purchase orders with foundries based on sales forecasts for our products. If any third-party foundry does not provide competitive pricing or is not able to meet our required capacity for any reason, we may not be able to obtain the required capacity to manufacture our products timely or efficiently. If we cannot maintain sufficient capacity or control pricing with our existing third-party foundries, we may need to increase our own manufacturing capacity, and there is no assurance that we can ramp up the production of the Oregon fab timely to meet the increased demand. If not, we may need to seek alternative foundries, which may not be available on commercially reasonable terms, or at all. In addition, the process for qualifying a new foundry is time consuming, difficult and may not be successful, particularly if we cannot integrate our proprietary process technology with the process used by the new foundry. Using a foundry with which we have no established relationship could expose us to potentially unfavorable pricing, unsatisfactory quality or insufficient capacity allocation.

In addition, even though we have been transferring more new product developments to our Oregon fab, we still rely on third-party foundries significantly to effectively implement certain of our proprietary technology and processes and also require their cooperation in developing new fabrication processes. Any failure to do so may impair our ability to introduce new products and on time delivery of wafers for our existing products. In order to maintain our profit margins and to meet our customer demand, we need to achieve acceptable production yields and timely delivery of silicon wafers. As is common in the semiconductor industry, we have experienced, and may experience from time to time, difficulties in achieving acceptable production yields and timely delivery from third-party foundry vendors. Minute impurities in a silicon wafer can cause a substantial number of wafers to be rejected or cause numerous die on a wafer to be defective. Low yields often occur during the production of new products, the migration of processes to smaller geometries or the installation and start up of new process technologies.

We face a number of other significant risks associated with outsourcing fabrication, including:

• limited control over delivery schedules, quality assurance and control and production costs;

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• discretion of foundries to reduce deliveries to us on short notice, allocate capacity to other customers that may be larger or have long-term customer or preferential arrangements with foundries that we use;

• unavailability of, or potential delays in obtaining access to, key process technologies;

• limited warranties on wafers or products supplied to us;

• damage to equipment and facilities, power outages, equipment or materials shortages that could limit manufacturing yields and capacity at the foundries;

• potential unauthorized disclosure or misappropriation of intellectual property, including use of our technology by the foundries to make products for our competitors;

• financial difficulties and insolvency of foundries; and

• acquisition of foundries by third parties.

Any of the foregoing risks could delay shipment of our products, result in higher expenses and reduced revenue, damage our relationships with customers and otherwise adversely affect our business and operating results.

Our operation of two in-house packaging and testing facilities are subject to risks that could adversely affect our business and financial results.

We have two in-house packaging and testing facilities located in Shanghai, China that handle most of our packaging and testing requirements. The operation of high-volume packaging and testing facilities and implementation of our advanced packaging technology are complex and demand a high degree of precision and may require modification to improve yields and product performance. We have committed substantial resources to ensure that our packaging and testing facilities operate efficiently and successfully, including the acquisition of equipment and raw materials, and training and management of a large number of technical personnel and employees. Due to the fixed costs associated with operating our own packaging and testing facilities, if we are unable to utilize our in-house facilities at a desirable level of production, our gross margin and results of operations may be adversely affected. For example, a significant decline in our market share or sales orders may negatively impact our factory utilization and reduce our ability to achieve profitability.

In addition, the operation of our packaging and testing facilities is subject to a number of risks, including the following:

• unavailability of equipment, whether new or previously owned, at acceptable terms and prices;

• facility equipment failure, power outages or other disruptions;

• shortage of raw materials, including packaging substrates, copper, gold and molding compound;

• failure to maintain quality assurance and remedy defects and impurities;

• changes in the packaging requirements of customers; and

• our limited experience in operating a high-volume packaging and testing facility.

Any of the foregoing risks could adversely affect our capacity to package and test our products, which could delay shipment of our products, result in higher expenses, reduce revenue, damage our relationships with customers and otherwise adversely affect our business, results of operations, financial condition and prospects.

Our reliance on distributors to sell a substantial portion of our products subjects us to a number of risks.

We sell a substantial portion of our products to distributors, who in turn sell to our end customers. Our distributors typically offer power semiconductor products from several different companies, including our direct competitors. The distributors assume collection risk and provide logistical services to end customers, including stocking our products. Two distributors, WPG and Promate, collectively accounted for 61.0%, 61.5% and 64.7% of our revenue for the fiscal years ended June 30, 2016, 2015 and 2014, respectively. Our agreements with Promate and WPG were renewed in July 2016 and are automatically renewed for each one-year period continuously unless terminated earlier pursuant to the provisions in the agreements. We believe that our success will continue to depend upon these distributors. Our reliance on distributors subjects us to a number of risks, including:

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• write-downs in inventories associated with stock rotation rights and increases in provisions for price adjustments granted to certain distributors;

• potential reduction or discontinuation of sales of our products by distributors;

• failure to devote resources necessary to sell our products at the prices, in the volumes and within the time frames that we expect;

• focusing their sales efforts on products of our competitors;

• dependence upon the continued viability and financial resources of these distributors, some of which are small organizations with limited working capital and all of which depend on general economic conditions and conditions within the semiconductor industry;

• dependence on the timeliness and accuracy of shipment forecasts and resale reports from our distributors;

• management of relationships with distributors, which can deteriorate as a result of conflicts with efforts to sell directly to our end customers; and

• termination of our agreements with distributors which are generally terminable by either party on short notice.

If any significant distributor becomes unable or unwilling to promote and sell our products, or if we are not able to renew our contracts with the distributors on acceptable terms, we may not be able to find a replacement distributor on reasonable terms or at all and our business could be harmed.

We have made and may continue to make strategic acquisitions of other companies, assets or businesses and these acquisitions introduce significant risks and uncertainties, including risks related to integrating the acquired assets or businesses, incurring additional debt, assuming contingent liabilities or diluting our existing shareholders.

In order to position ourselves to take advantage of growth opportunities, we have made, and may continue to make, strategic acquisitions, mergers and alliances that involve significant risks and uncertainties. Successful acquisitions and alliances in the semiconductor industry are difficult to accomplish because they require, among other things, efficient integration and aligning of product offerings and manufacturing operations and coordination of sales and marketing and research and development efforts. The difficulties of integration and alignment may be increased by the necessity of coordinating geographically separated organizations, the complexity of the technologies being integrated and aligned and the necessity of integrating personnel with disparate business backgrounds and combining different corporate cultures.

In addition, we may also issue equity securities to pay for future acquisitions or alliances, which could be dilutive to existing shareholders. We may also incur debt or assume contingent liabilities in connection with acquisitions and alliances, which could impose restrictions on our business operations and harm our operating results.

If we are unable to obtain raw materials in a timely manner or if the price of raw materials increases significantly, production time and product costs could increase, which may adversely affect our business.

Our fabrication and packaging processes depend on raw materials such as silicon wafers, gold, copper, molding compound, petroleum and plastic materials and various chemicals and gases. From time to time, suppliers may extend lead times, limit supplies or increase prices due to capacity constraints or other factors. If the prices of these raw materials rise significantly, we may be unable to pass on the increased cost to our customers. Our results of operations could be adversely affected if we are unable to obtain adequate supplies of raw materials in a timely manner or at reasonable price. In addition, from time to time, we may need to reject raw materials because they do not meet our specifications or the sourcing of such materials do not comply with our conflict mineral policies, resulting in potential delays or declines in output. Furthermore, problems with our raw materials may give rise to compatibility or performance issues in our products, which could lead to an increase in customer returns or product warranty claims. Errors or defects may arise from raw materials supplied by third parties that are beyond our detection or control, which could lead to additional customer returns or product warranty claims that may adversely affect our business and results of operations.

Our operations may be delayed or interrupted and our business may be adversely affected as a result of our efforts to comply with environmental regulations applicable to our in-house wafer manufacturing, packaging and testing facility.

Our in-house manufacturing operations, including wafer manufacturing, packaging and testing, are subject to a variety of environmental regulations relating to the use, handling, discharge and disposal of toxic or otherwise hazardous materials. See “Item 1. Business - Environmental matters.” Compliance with environmental regulations could require us to acquire expensive pollution control equipment or to incur other substantial expenses or investigate and remediate contamination at our current

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facilities. Any failure, or any claim that we have failed, to comply with these regulations could cause delays in our production and capacity expansion and affect our public image, either of which could harm our business. In addition, any failure to comply with these regulations could subject us to substantial fines or other liabilities, result in the suspension of our operating permit, or require us to terminate or adversely modify our in-house manufacturing operations.

We may not be able to accurately estimate provisions at fiscal period end for price adjustment and stock rotation rights under our agreements with distributors, and our failure to do so may impact our operating results.

We sell a majority of our products to distributors under arrangements allowing price adjustments and returns under stock rotation programs, subject to certain limitations. As a result, we are required to estimate allowances for price adjustments and stock rotation for our products as inventory at distributors at each reporting period end. Our ability to reliably estimate these allowances enables us to recognize revenue upon delivery of goods to distributors instead of upon resale of goods by distributors to end customers.

We estimate the allowance for price adjustment based on factors such as distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for our products. Our estimated allowances for price adjustments, which we offset against accounts receivable from distributors, were $16.7 million and $19.4 million at June 30, 2016 and 2015, respectively.

Our accruals for stock rotation are estimated based on historical returns and individual distributor agreement, and stock rotation rights, which are recorded as accrued liabilities on our consolidated balance sheets, are contractually capped based on the terms of each individual distributor agreement. Our estimated liabilities for stock rotation at June 30, 2016 and 2015 were $2.0 million and $1.9 million, respectively.

Our estimates for these allowances and accruals may be inaccurate. If we subsequently determine that any allowance and accrual based on our estimates is insufficient, we may be required to increase the size of our allowances and accrual in future periods, which would adversely affect our results of operations and financial condition.

We depend on the continuing efforts of our senior management team and other key personnel, and if we lose a member of our senior management or are unable to successfully retain, recruit and train key personnel, our ability to develop and market our products could be harmed.

Our success depends upon the continuing services of members of our senior management team and various engineering and other technical personnel. In particular, our engineers and other sales and technical personnel are critical to our future technological and product innovations. Our industry is characterized by high demand and intense competition for talent and the pool of qualified candidates is limited. We have entered into employment agreements with certain senior executives, but we do not have employment agreements with most of our employees. Many of these employees could leave our company with little or no prior notice and would be free to work for a competitor. If one or more of our senior executives or other key personnel are unable or unwilling to continue in their present positions, we may not be able to replace them easily or at all and other senior management may be required to divert attention from other aspects of our business. In addition, we do not have “key person” life insurance policies covering any member of our management team or other key personnel. The loss of any of these individuals or our inability to attract or retain qualified personnel, including engineers and others, could adversely affect our product introductions, overall business growth prospects, results of operations and financial condition.

If we fail to maintain an effective system of internal control over financial reporting, we may not be able to accurately report our financial results or prevent fraud.

Our management may conclude that our internal control over financial reporting is not effective. Moreover, even if our management concludes that our internal control over financial reporting is effective, our independent registered public accounting firm may decline to issue an opinion as to the effectiveness of our internal control over financial reporting, or may issue a report that is qualified or adverse. During the course of the initial evaluation of internal control over financial reporting, we or our independent registered public accounting firm may identify control deficiencies that we may not be able to remediate prior to the date of our first assessment of internal control over financial reporting. Our failure to achieve and maintain effective internal control over financial reporting could result in the loss of investor confidence in the reliability of our financial statements or prevent fraud, which in turn could harm our business and negatively impact the trading price of our shares.

Failure to protect our patents and our other proprietary information could harm our business and competitive position.

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Our success depends, in part, on our ability to protect our intellectual property. We rely on a combination of patent, copyright (including mask work protection), trademark and trade secret laws, as well as nondisclosure agreements, license agreements and other methods to protect our intellectual property rights, which may not be sufficient to protect our intellectual property. As of June 30, 2016, we owned 601 issued U.S. patents expiring between 2016 and 2035 and had 150 pending patent applications with the United States Patent and Trademark Office. In addition, we own additional patents and have filed patent applications in several jurisdictions outside of the U.S, including China, Taiwan, Japan and Korea.

Our patents and patent applications may not provide meaningful protection from our competitors, and there is no guarantee that patents will be issued from our patent applications. The status of any patent or patent application involves complex legal and factual determinations and the breadth of a claim is uncertain. In addition, our efforts to protect our intellectual property may not succeed due to difficulties and risks associated with:

• policing any unauthorized use of or misappropriation of our intellectual property, which is often difficult and costly and could enable third parties to benefit from our technologies without paying us;

• others independently developing similar proprietary information and techniques, gaining authorized or unauthorized access to our intellectual property rights, disclosing such technology or designing around our patents;

• the possibility that any patent or registered trademark owned by us may not be enforceable or may be invalidated, circumvented or otherwise challenged in one or more countries and the rights granted thereunder may not provide competitive advantages to us;

• uncertainty as to whether patents will be issued from any of our pending or future patent applications with the scope of the claims sought by us, if at all; and

• intellectual property laws and confidentiality protections, which may not adequately protect our intellectual property rights, including, for example, in China where enforcement of China intellectual property-related laws has historically been less effective, primarily because of difficulties in enforcement and low damage awards.

We also rely on customary contractual protections with our customers, suppliers, distributors, employees and consultants, and we implement security measures to protect our trade secrets. We cannot assure you that these contractual protections and security measures will not be breached, that we will have adequate remedies for any such breach or that our suppliers, employees, distributors or consultants will not assert rights to intellectual property arising out of such contracts.

In addition, we have a number of third-party patent and intellectual property license agreements, one of which requires us to make ongoing royalty payments. In the future, we may need to obtain additional licenses, renew existing license agreements or otherwise replace existing technology. We are unable to predict whether these license agreements can be obtained or renewed or the technology can be replaced on acceptable terms, or at all.

Intellectual property disputes could result in lengthy and costly arbitration, litigation or licensing expenses or prevent us from selling our products.

As is typical in the semiconductor industry, we or our customers may receive claims of infringement from time to time or otherwise become aware of potentially relevant patents or other intellectual property rights held by other parties that may cover some of our technology, products and services or those of our end customers. The semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights which has resulted in protracted and expensive arbitration and litigation for many companies. Patent litigation has increased in recent years due to increased assertions made by intellectual property licensing entities or non-practicing entities and increasing competition and overlap of product functionality in our markets.

Any litigation or arbitration regarding patents or other intellectual property could be costly and time consuming and could divert our management and key personnel from our business operations. We have in the past and may from time to time in the future become involved in litigation that requires our management to commit significant resources and time. In addition, as part of our strategy to diversify our serviceable markets, we launched several key product families and technologies to enable high efficiency power conversion solutions and we plan to develop and commercialize new products in other power semiconductor markets. Our entry into the commercial markets for high-voltage power semiconductors and other markets as a result of our diversification strategy may subject us to additional and increased risk of disputes or litigation relating to these products.

Because of the complexity of the technology involved and the uncertainty of litigation generally, any intellectual property arbitration or litigation involves significant risks. Any claim of intellectual property infringement against us may require us to:

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• incur substantial legal and personnel expenses to defend the claims or to negotiate for a settlement of claims;

• pay substantial damages or settlement to the party claiming infringement;

• refrain from further development or sale of our products;

• attempt to develop non-infringing technology, which may be expensive and time consuming, if possible at all;

• enter into costly royalty or license agreements that might not be available on commercially reasonable terms or at all;

• cross-license our technology with a competitor to resolve an infringement claim, which could weaken our ability to compete with that competitor; and

• indemnify our distributors, end customers, licensees and others from the costs of and damages of infringement claims by our distributors, end customers, licensees and others, which could result in substantial expenses for us and damage our business relationships with them.

Any intellectual property claim or litigation could harm our business, results of operations, financial condition and prospects.

Global or regional economic, political and social conditions could adversely affect our business and operating results.

External factors such as potential terrorist attacks, acts of war, financial crises, such as the global or regional economic recession, or geopolitical and social turmoil in those parts of the world that serve as markets for our products could have significant adverse effect on our business and operating results in ways that cannot presently be predicted. Any future economic downturn or recession in the global economy in general and, in particular, on the economies in China, Taiwan and other countries where we market and sell our products, will have an adverse effect on our results of operations. Since the beginning of calendar year 2013, we have experienced a significant reduction in the demand for our products due to the declining PC markets, particularly from our distributors and customers in Taiwan, which have negatively impacted our revenue and profitability.

Our business operations could be significantly harmed by natural disasters or global epidemics.

We have research and development facilities located in Taiwan and the Silicon Valley in Northern California. Historically, these regions have been vulnerable to natural disasters and other risks, such as earthquakes, fires and floods, which may disrupt the local economy and pose physical risks to our property. We also have sales offices located in Taiwan and Japan where similar natural disasters and other risks may disrupt the local economy and pose physical risks to our operations. We are not currently covered by insurance against business disruption caused by earthquakes. In addition, we currently do not have redundant, multiple site capacity in the event of a natural disaster or other catastrophic event. In the event of such an occurrence, our business would suffer.

Our business could be adversely affected by natural disasters such as epidemics, outbreaks or other health crisis. An outbreak of avian flu or H1N1 flu in the human population, or another similar health crisis, could adversely affect the economies and financial markets of many countries, particularly in Asia. Moreover, any related disruptions to transportation or the free movement of persons could hamper our operations and force us to close our offices temporarily.

The occurrence of any of the foregoing or other natural or man-made disasters could cause damage or disruption to us, our employees, operations, distribution channels, markets and customers, which could result in significant delays in deliveries or substantial shortages of our products and adversely affect our business results of operations, financial condition or prospects.

Our insurance may not cover all losses, including losses resulting from business disruption or product liability claims.

We have limited product liability, business disruption or other business insurance coverage for our operations. In addition, we do not have any business insurance coverage for our operations to cover losses that may be caused by litigation or natural disasters. Any occurrence of uncovered loss could harm our business, results of operations, financial condition and prospects.

We may be adversely affected by any disruption in our information technology systems.

Our operations are dependent upon our information technology systems, which encompass all of our major business functions across offices internationally. We rely upon such information technology systems to manage and replenish inventory, complete and track customer orders, coordinate sales activities across all of our products and services, maintain

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vital data and information, perform financial and accounting tasks and manage and perform various administrative and human resources functions. A substantial disruption in our information technology systems for any extended time period (arising from, for example, system capacity limits from unexpected increases in our volume of business, outages or delays in our service) could result in delays in receiving inventory and supplies or filling customer orders and adversely affect our customer service and relationships. Our systems might be damaged or interrupted by natural or man−made events or by computer viruses, physical or electronic break−ins, cyber attacks and similar disruptions affecting the global Internet. There can be no assurance that such delays, problems, or costs will not have a material adverse effect on our cash flows, results of operations and financial condition.

Our international operations subject our company to risks not faced by companies without international operations.

We have adopted a global business model under which we maintain significant operations and facilities through our subsidiaries located in the U.S., China, Taiwan and Hong Kong. Our main research and development center is located in Silicon Valley, and our manufacturing and supply chain is located in China. We also have sales offices and customers throughout Asia, the U.S. and elsewhere in the world. Our international operations may subject us to the following risks:

• economic and political instability;

• costs and delays associated with transportations and communications;

• coordination of operations through multiple jurisdictions and time zones;

• fluctuations in foreign currency exchange rates;

• trade restrictions, changes in laws and regulations relating to, amongst other things, import and export tariffs, taxation, environmental regulations, land use rights and property; and

• the laws of, including tax laws, and the policies of the U.S. toward, countries in which we operate.

We are subject to the risk of increased income taxes and changes in existing tax rules.

We conduct our business in multiple jurisdictions, including Hong Kong, Macau, the U.S., China, Taiwan, South Korea and Japan. The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in various taxing jurisdictions. Any of these jurisdictions may assert that we have unpaid taxes. Our effective tax rates have fluctuated significantly in recent years. Our effective tax rate was 406.6%, (100.8)% and (826.6)% for the fiscal years ended June 30, 2016, 2015 and 2014, respectively. Any tax rate changes in the tax jurisdictions in which we operate could result in adjustments to our deferred tax assets, if applicable, which would affect our effective tax rate and results of operations. We base our tax position upon the anticipated nature and conduct of our business and upon our understanding of the tax laws of the various countries in which we have assets or conduct activities. However, our tax position is subject to review and possible challenge by tax authorities and to possible changes in law, which may have a retroactive effect. In particular, various proposals over the years have been made to change certain U.S. tax laws relating to foreign entities with U.S. connections. In addition, the U.S. government has proposed various other changes to the U.S. international tax system, certain of which could adversely impact foreign-based multinational corporate groups, and increased enforcement of U.S. international tax laws. It is possible that these or other changes in the U.S. tax laws or proposed actions by international bodies such as the Organization of Economic Cooperation and Development (OECD) could significantly increase our U.S. or foreign income tax liability in the future.

In addition, our subsidiaries provide products and services to, and may from time to time undertake certain significant transactions with, us and other subsidiaries in different jurisdictions. We have adopted transfer pricing arrangements for transactions among our subsidiaries. Related party transactions are generally subject to close review by tax authorities, including requirements that transactions be priced at arm's length and be adequately documented. If any tax authorities were successful in challenging our transfer pricing policies or other tax judgments, our income tax expense may be adversely affected and we could also be subject to interest and penalty charges which may harm our business, financial condition and operating results.

The imposition of U.S. corporate income tax on our Bermuda parent and non-U.S. subsidiaries could adversely affect our results of operations.

We believe that our Bermuda parent and non-U.S. subsidiaries each operate in a manner that they would not be subject to U.S. corporate income tax because they are not engaged in a trade or business in the United States. Nevertheless, there is a risk that the U.S. Internal Revenue Service may successfully assert that our Bermuda parent and non-U.S. subsidiaries are engaged in a trade or business in the United States. If our Bermuda parent and non-U.S. subsidiaries were characterized as

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being so engaged, we would be subject to U.S. tax at regular corporate rates on our income that is effectively connected with U.S. trade or business, plus an additional 30% “branch profits” tax on the dividend equivalent amount, which is generally effectively connected income with certain adjustments, deemed withdrawn from the United States. Any such tax could materially and adversely affect our results of operations.

We may be classified as a passive foreign investment company, which could result in adverse U.S. federal income tax consequences for U.S. holders.

Based on the current and anticipated valuation of our assets and the composition of our income and assets, we do not expect to be considered a passive foreign investment company, or PFIC, for U.S. federal income tax purposes for the foreseeable future. However, we must make a separate determination for each taxable year as to whether we are a PFIC after the close of each taxable year and we cannot assure you that we will not be a PFIC for our 2016 taxable year or any future taxable year. Under current law, a non-U.S. corporation will be considered a PFIC for any taxable year if either (1) at least 75% of its gross income is passive income or (2) at least 50% of the value of its assets, generally based on an average of the quarterly values of the assets during a taxable year, is attributable to assets that produce or are held for the production of passive income. PFIC status depends on the composition of our assets and income and the value of our assets, including, among others, a pro rata portion of the income and assets of each subsidiary in which we own, directly or indirectly, at least 25% by value of the subsidiary's equity interests, from time to time. Because we currently hold and expect to continue to hold a substantial amount of cash or cash equivalents, and because the calculation of the value of our assets may be based in part on the value of our common shares, which may fluctuate considerably given that market prices of technology companies historically often have been volatile, we may be a PFIC for any taxable year. If we were treated as a PFIC for any taxable year during which a U.S. holder held common shares, certain adverse U.S. federal income tax consequences could apply for such U.S. holder.

Risks Related to Our Industry

The average selling prices of products in our markets have historically decreased rapidly and will likely do so in the future, which could harm our revenue and gross margins.

As is typical in the semiconductor industry, the average selling price of a particular product has historically declined significantly over the life of the product. In the past, we have reduced the average selling prices of our products in anticipation of future competitive pricing pressures, new product introductions by us or our competitors and other factors. We expect that we will have to similarly reduce prices in the future for older generations of products. Reductions in our average selling prices to one customer could also impact our average selling prices to all customers. A decline in average selling prices would harm our gross margins for a particular product. If not offset by sales of other products with higher gross margins, our overall gross margins may be adversely affected. Our business, results of operations, financial condition and prospects will suffer if we are unable to offset any reductions in our average selling prices by increasing our sales volumes, reducing our costs and developing new or enhanced products on a timely basis, with higher selling prices or gross margins.

We may be adversely affected by the cyclicality of the semiconductor industry.

Our industry is highly cyclical and is characterized by constant and rapid technological change such as the introduction of smartphones and tablets that contributed to the decline in the PC market, product obsolescence and price erosion, evolving standards, uncertain product life cycles and wide fluctuations in product supply and demand. The industry has, from time to time, experienced significant and sometimes prolonged, downturns, and often connected with or in anticipation of, maturing product cycles and declines in general economic conditions. These downturns have been characterized by diminished product demand, production overcapacity, high inventory levels and accelerated erosion of average selling prices. Any future downturns, in particular the PC markets, may reduce our revenue and result in us having excess inventory. By contrast, any upturn in the semiconductor industry could result in increased competition for access to limited third-party foundry and packaging and testing capacity, which could prevent us from benefiting from such an upturn or reduce our profit margins.

Changes in industry standards, technology, customer requirements and government regulation could limit our ability to sell our products.

The semiconductor industry is characterized by changing demand for new and advanced functions, long design and sales cycles, rapid product obsolescence and price erosion, intense competition, evolving industry standards and wide fluctuations in product supply and demand. Changes in industry standards, or the development of new industry standards, or, when applicable, government approval or disapproval of industry standards may make our products obsolete or negate the cost

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advantages we believe we have in our products. We may be required to invest significant effort and to incur significant expense to redesign our products in order to address relevant standards, technological developments, customer requirements or regulations but may not have the financial resources to respond to these changes effectively or in a timely manner. Any inability to meet these standards, regulations and requirements could harm our business, results of operations, financial condition and prospects.

Risks Related to Doing Business in China

China's economic, political and social conditions, as well as government policies, could affect our business and growth.

Our financial results have been, and are expected to continue to be, affected by the economy in China. After experiencing rapid growth for more than a decade, China's economy recently has experienced a slowdown in the last two years. In 2015, China's economy grew by 6.9%, compared with 7.3% a year earlier, marking its slowest growth in a quarter of a century. As the government tried to shift the growth engine away from manufacturing and debt-fueled investment toward the services sector and consumer spending, the outlook of the Chinese economy is uncertain.

If China’s economy is further slowing down, it may negatively affect our business operation and financial results. The China economy differs from the economies of most developed countries in many respects, including:

• higher level of government involvement;

• early stage of development of a market-oriented economy;

• rapid growth rate;

• higher level of control over foreign currency exchange; and

• less efficient allocation of resources.

The Chinese economy has been transitioning from a planned economy to a more market-oriented economy. Although in recent years the China government has implemented measures emphasizing the utilization of market forces for economic reform, the reduction of state ownership of productive assets and the establishment of corporate governance in business enterprises, the China government continues to retain significant control over the business and productive assets in China. Any changes in China's government policy or China's political, economic and social conditions, or in relevant laws and regulations, may adversely affect our current or future business, results of operation or financial condition. These changes in government policy may be implemented through various means, including changes in laws and regulations, implementation of anti-inflationary measures, change of basic interest rate, changes in the tax rate or taxation system and the imposition of additional restrictions on currency conversion and imports. Furthermore, given China's largely export-driven economy, any changes in the economies of the China's principal trading partners and other export-oriented nations may adversely affect our business, results of operations, financial condition and prospects.

Our ability to successfully expand our business operations in China depends on a number of factors, including macroeconomic and other market conditions, and credit availability from lending institutions. In response to the recent global and Chinese economic recession, the China government has promulgated several measures aimed at expanding credit and stimulating economic growth. We cannot assure you that the various macroeconomic measures, monetary policies and economic stimulus package adopted by the China government to guide economic growth will be effective in maintaining or sustaining the growth rate of the Chinese economy. If measures adopted by the China government fail to achieve further growth in the Chinese economy, it may adversely affect our growth, business strategies and operating results. In addition, changes in political and social conditions of China may adversely affect our ability to conduct our business in the region. For example, geopolitical disputes and increased tensions between China and its neighboring countries in which we conduct business could make it more difficult for us coordinate and manage our international operations in such countries.

Changes in China's laws, legal protections or government policies on foreign investment in China may harm our business.

Our business and corporate transactions, including our operations through the JV Company, are subject to laws and regulations applicable to foreign investment in China as well as laws and regulations applicable to foreign-invested enterprises. These laws and regulations frequently change, and their interpretation and enforcement involves uncertainties that could limit the legal protections available to us. Regulations and rules on foreign investments in China impose restrictions on the means that a foreign investor like us may apply to facilitate corporate transactions we may undertake. In addition, the Chinese legal system is based in part on government policies and internal rules, some of which are not published on a timely basis or at all, that may have a retroactive effect. As a result we may not be aware of our violation of these policies and rules until some time after the violation. If any of our past operations are deemed to be non-compliant with Chinese law, we may be

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subject to penalties and our business and operations may be adversely affected. For instance, under the catalogue for the Guidance of Foreign Investment Industries, some industries are categorized as sectors which are encouraged, restricted or prohibited for foreign investment. As the catalogue for the Guidance of Foreign Investment Industries is updated every few years, there can be no assurance that the China government will not change its policies in a manner that would render part or all of our business to fall within the restricted or prohibited categories. If we cannot obtain approval from relevant authorities to engage in businesses which become prohibited or restricted for foreign investors, we may be forced to sell or restructure a business which has become restricted or prohibited for foreign investment. Furthermore, the China government has broad discretion in dealing with violations of laws and regulations, including levying fines, revoking business and other licenses and requiring actions necessary for compliance. In particular, licenses and permits issued or granted to us by relevant governmental bodies may be revoked at a later time by higher regulatory bodies. If we are forced to adjust our corporate structure or business as a result of changes in government policy on foreign investment or changes in the interpretation and application of existing or new laws, our business, financial condition, results of operations and prospects may be harmed. Moreover, uncertainties in the Chinese legal system may impede our ability to enforce contracts with our business partners, customers and suppliers, or otherwise pursue claims in litigation to recover damages or loss of property, which could adversely affect our business and operations.

Substantial uncertainties exist with respect to the enactment timetable, interpretation and implementation of draft PRC Foreign Investment Law and how it may impact the viability of our current corporate structure, corporate governance and business operations.

The Ministry of Commerce (MOC) published a discussion draft of the proposed Foreign Investment Law in January 2015 aiming to, upon its enactment, replace the trio of existing laws regulating foreign investment in China, namely, the Sino-foreign Equity Joint Venture Enterprise Law, the Sino-foreign Cooperative Joint Venture Enterprise Law and the Wholly Foreign-invested Enterprise Law, together with their implementation rules and ancillary regulations. The draft Foreign Investment Law embodies an expected PRC regulatory trend to rationalize its foreign investment regulatory regime in line with prevailing international practice and the legislative efforts to unify the corporate legal requirements for both foreign and domestic investments. The MOC is currently soliciting comments on this draft and substantial uncertainties exist with respect to its enactment timetable, interpretation and implementation. The draft Foreign Investment Law, if enacted as proposed, may materially impact the viability of our current corporate structure, corporate governance and business operations in many aspects.

The draft Foreign Investment Law, if enacted as proposed, may also materially impact our corporate governance practice and increase our compliance costs. For instance, the draft Foreign Investment Law imposes stringent ad hoc and periodic information reporting requirements on foreign investors and the applicable foreign invested entities. Aside from an investment implementation report and an investment amendment report that are required for each investment and alteration of investment specifics, an annual report is mandatory, and large foreign investors meeting certain criteria are required to report on a quarterly basis. Any company found to be non-compliant with these information reporting obligations may potentially be subject to fines and/or administrative or criminal liabilities, and the persons directly responsible may be subject to criminal liabilities.

Limitations on our ability to transfer funds to our China subsidiaries could adversely affect our ability to expand our operations, make investments that could benefit our businesses and otherwise fund and conduct our business.

The transfer of funds from us to our China subsidiaries, either as a shareholder loan or as an increase in registered capital, is subject to registration with or approval by the China's governmental authorities, including the State Administration of Foreign Exchange, or SAFE, or the relevant examination and approval authority. Our subsidiaries may also experience difficulties in converting our capital contributions made in foreign currencies into RMB due to changes in the China's foreign exchange control policies. Therefore, it may be difficult to change capital expenditure plans once the relevant funds have been remitted from us to our China subsidiaries. These limitations and the difficulties our China subsidiaries may experience on the free flow of funds between us and our China subsidiaries could restrict our ability to act in response to changing market situations in a timely manner.

China's currency exchange control and government restrictions on investment repatriation may impact our ability to transfer funds outside of China.

A significant portion of our business is conducted in China where the currency is the Renminbi. Regulations in China permit foreign owned entities to freely convert the Renminbi into foreign currency for transactions that fall under the “current account,” which includes trade related receipts and payments, interest and dividends. Accordingly, our Chinese subsidiaries may use Renminbi to purchase foreign exchange for settlement of such “current account” transactions without pre-approval. However, pursuant to applicable regulations, foreign‑invested enterprises in China may pay dividends only out of their accumulated profits, if any, determined in accordance with Chinese accounting standards and regulations. In calculating

27

accumulated profits, foreign investment enterprises in China are required to allocate at least 10% of their accumulated profits each year, if any, to fund certain reserve funds, including mandated employee benefits funds, unless these reserves have reached 50% of the registered capital of the enterprises.

Other transactions that involve conversion of Renminbi into foreign currency are classified as “capital account” transactions; examples of “capital account” transactions include repatriations of investment by or loans to foreign owners, or direct equity investments in a foreign entity by a China domiciled entity. “Capital account” transactions require prior approval from China's State Administration of Foreign Exchange (SAFE) or its provincial branch to convert a remittance into a foreign currency, such as U.S. dollars, and transmit the foreign currency outside of China.

As a result of these and other restrictions under PRC laws and regulations, our China subsidiaries are restricted in their ability to transfer a portion of their net assets to the parent; such restricted portion amounted to approximately $84.2 million, or 34.8% of our total consolidated net assets as of June 30, 2016. We have no assurance that the relevant Chinesegovernmental authorities in the future will not limitfurther or eliminate the ability of our China subsidiaries to purchase foreign currencies and transfer such funds to us to meet our liquidity or other business needs. Any inability to access funds in China, if and when needed for use by the Company outside of China, could have a material and adverse effect on our liquidity and our business.

The M&A Rules and certain other PRC regulations establish complex procedures for some acquisitions of Chinese companies by foreign investors, which could make it more difficult for us to pursue growth through acquisitions in China.

The Regulations on Mergers and Acquisitions of Domestic Companies by Foreign Investors, or the M&A Rules, adopted by six PRC regulatory agencies in August 2006 and amended in 2009, and some other regulations and rules concerning mergers and acquisitions established additional procedures and requirements that could make merger and acquisition activities by foreign investors more time consuming and complex, including requirements in some instances that the MOC be notified in advance of any change-of-control transaction in which a foreign investor takes control of a PRC domestic enterprise. Moreover, the Anti-Monopoly Law requires that the MOC shall be notified in advance of any concentration of undertaking if certain thresholds are triggered. In addition, the security review rules issued by the MOC that became effective in September 2011 specify that mergers and acquisitions by foreign investors that raise “national defense and security” concerns and mergers and acquisitions through which foreign investors may acquire de facto control over domestic enterprises that raise “national security” concerns are subject to strict review by the MOC, and the rules prohibit any activities attempting to bypass a security review, including by structuring the transaction through a proxy or contractual control arrangement. In the future, we may grow our business by acquiring complementary businesses. Complying with the requirements of the above-mentioned regulations and other relevant rules to complete such transactions could be time consuming, and any required approval processes, including obtaining approval from the MOC or its local counterparts may delay or inhibit our ability to complete such transactions, which could affect our ability to expand our business or maintain our market share.

Our result of operations may be negatively impacted by fluctuations in foreign currency exchange rates between U.S. dollars and Chinese Yuan, or RMB.

While U.S. dollars is our main functional currency and our revenue and a significant portion of our operating expenses are denominated in U.S. dollars, we are required to maintain local currencies, primarily the RMB, in our cash balances in connection with the funding of our oversea operations.  As a result, our costs and operating expenses may be exposed to adverse movements in foreign currency exchange rates between the U.S. dollars and RMB.  We also do not utilize any financial instruments to hedge or reduce potential losses due to the fluctuation of foreign currency exchange rates.  In general, any appreciation of U.S. dollars against a weaker RMB could reduce the value of our cash and cash equivalent balance, which could increase our operating expenses and negatively affect our cash flow, income and profitability.  The value of RMB against the U.S. dollars may fluctuate and is affected by many factors outside of our control, including changes in political and economic conditions, implementation of new monetary policies by the Chinese government and changes in banking regulations, and there is no guarantee that we will be able to mitigate or recoup any losses due to a significant fluctuation in the U.S. dollars/RMB exchange rates.

There are differences between PRC and U.S. Generally Accepted Accounting Principles.

Our profits will be derived from the business of the Joint Venture, which is established in the PRC. The profits available for distribution for companies established in the PRC are determined in accordance with PRC accounting standards, which may differ from the amounts determined under U.S. GAAP. In the event that the amount of the profits determined under the PRC accounting standard in a given year is less than that determined under the U.S. GAAP, our results of operations may be affected adversely.

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PRC labor laws may adversely affect our results of operations.

On June 29, 2007, the PRC government promulgated the Labor Contract Law of the PRC, effective on January 1, 2008, to govern the establishment of employment relationships between employers and employees, and the conclusion, performance, termination of and the amendment to employment contracts. The Labor Contract Law imposes greater liabilities on employers and significantly affects the cost of an employer’s decision to reduce its workforce. Further, it requires that certain terminations be based upon seniority and not merit. In the event our subsidiaries decide to significantly change or decrease their workforce in China, the Labor Contract Law could adversely affect their ability to effect such changes in a manner that is most advantageous to our business or in a timely and cost-effective manner, thus materially and adversely affecting our financial condition and results of operations.

In recent years, compensation in various industries in China has increased and may continue to increase in the future. In order to attract and retain skilled personnel, we may need to increase the compensation of our employees. Compensation may, also, increase as inflationary pressure increases in China. In addition, under the Regulations on Paid Annual Leave for Employees, which became effective on January 1, 2008, employees who have served more than one year for a specific employer are entitled to a paid vacation ranging from 5 to 15 days, depending on length of service. Employees who waive such vacation time at the request of employers must be compensated for three times their normal salaries for each waived vacation day. This mandated paid-vacation regulation, coupled with the trend of increasing compensation, may result in increase in our employee-related costs and expenses and decrease in our profit margins.

Controversies affecting China's trade with the United States could harm our business.

While China has been granted permanent most favored nation trade status in the United States through its entry into the World Trade Organization, controversies between the United States and China may arise that threaten the trading relationship between the two countries. At various times during recent years, the United States and China have had disagreements over political and economic issues. In addition, disagreements between the United States and China with respect to their political, military or economic policies toward Taiwan may contribute to further controversies. These controversies and trade frictions could have a material adverse effect on our business by, among other things, making it more difficult for us to coordinate our operations between the United States and China or causing a reduction in the demand for our products by customers in the United States or China.

Relations between Taiwan and China could negatively affect our business, financial condition and operating results and, therefore, the market value of our common shares.

Taiwan has a unique international political status. China does not recognize the sovereignty of Taiwan. Although significant economic and cultural relations have been established during recent years between Taiwan and China, relations have often been strained. A substantial number of our key customers and some of our essential sales and engineering personnel are located in Taiwan, and we have a large number of operational personnel and employees located in China. Therefore, factors affecting military, political or economic relationship between China and Taiwan could have an adverse effect on our business, financial condition and operating results.

Risks Related to Our Corporate Structure and Our Common Shares

Our share price may be volatile and you may be unable to sell your shares at or above the purchase price, if at all.

Limited trading volumes and liquidity of our common shares on the NASDAQ Global Market may limit the ability of shareholders to purchase or sell our common shares in the amounts and at the times they wish.  In addition, the financial markets in the United States and other countries have experienced significant price and volume fluctuations, and market prices of technology companies have been and continue to be extremely volatile. The trading price of our common shares on The NASDAQ Global Market ranged from a low of $6.83 to high of $17.91 from the commencement of the public trading of our common shares on April 29, 2010, to July 31, 2016 and from a low of $6.99 to high of $14.76 from July 1, 2015 to June 30, 2016. Volatility in the price of our shares may be caused by factors outside our control and may be unrelated or disproportionate to our operating results.

The market price for our common shares may be volatile and subject to wide fluctuations in response to factors, including:

• actual or anticipated fluctuations in our operating results;

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• general economic, industry, regional and global market conditions, including the economic conditions of specific market segments for our products, including the PC markets;

• our failure to meet analysts' expectations, including expectation regarding our revenue, gross margin and operating expenses;

• changes in financial estimates and outlook by securities research analysts;

• our ability to increase our gross margin;

• announcements by us or our competitors of new products, acquisitions, strategic partnerships, joint ventures or capital commitments;

• announcements of technological or competitive developments;

• announcement of acquisition and major corporate transactions;

• regulatory developments in our target markets affecting us, our customers or our competitors;

• our ability to enter into new market segments, gain market share, diversify our customer base and successfully secure manufacturing capacity;

• announcements regarding intellectual property disputes or litigation involving us or our competitors;

• changes in the estimation of the future size and growth rate of our markets;

• additions or departures of key personnel;

• announcement of sales of our securities by us or by our major shareholders;

• general economic or political conditions in China; and

• other factors.

In the past, securities class action litigation has often been brought against a company following periods of volatility in such company's share price.  This type of litigation could result in substantial costs and divert our management's attention and resources which could negatively impact our business and financial conditions.

If securities or industry analysts do not publish research or reports about our business, or if they adversely change their recommendations regarding our common shares or if our operating results do not meet their expectations, the trading price of our common shares could decline.

The market price of our common shares is influenced by the research and reports that industry or securities analysts publish about us or our business. There is no guarantee that these analysts will understand our business and results, or that their reports will be accurate or correctly predict our operating results or prospects. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause the market price of our common shares or its trading volume to decline. Moreover, if one or more of the analysts who cover our company downgrade our common shares or if our operating results or prospects do not meet their expectations, the market price of our common shares could decline significantly.

Anti-takeover provisions in our bye-laws could make an acquisition of us more difficult and may prevent attempts by our shareholders to replace or remove our current management.

Certain provisions in our bye-laws may delay or prevent an acquisition of us or a change in our management. In addition, by making it more difficult for shareholders to replace members of our board of directors, these provisions also may frustrate or prevent any attempts by our shareholders to replace or remove our current management because our board of directors is responsible for appointing the members of our management team. These provisions include:

• the ability of our board of directors to determine the rights, preferences and privileges of our preferred shares and to issue the preferred shares without shareholder approval;

• advance notice requirements for election to our board of directors and for proposing matters that can be acted upon at shareholder meetings; and

• the requirement to remove directors by a resolution passed by at least two-thirds of the votes cast by the shareholders having a right to attend and vote at the shareholder meeting.

These provisions could make it more difficult for a third-party to acquire us, even if the third-party's offer may be considered beneficial by many shareholders. As a result, shareholders may be limited in their ability to obtain a premium for their shares.

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Insiders have substantial control over us, which could adversely affect the market price of our shares.

Our Chief Executive Officer, certain members of our management and directors, beneficially owned, in the aggregate, approximately 23.7% of our outstanding common shares as of June 30, 2016. As a result, these shareholders will be able to exert significant control over all matters requiring shareholder approval, including the election of directors and approval of significant corporate transactions, such as a merger, consolidation, takeover or other business combination involving us. This concentration of ownership may also discourage, delay or prevent a change in control of our company, which could deprive our shareholders of an opportunity to receive a premium for their shares as part of a sale of our company and may reduce the trading price of our shares. Furthermore, the interests of these insiders could conflict with the interests of our other shareholders and, accordingly, any of them may take actions that favor their own interests and which may not be in the best interests of our other shareholders. These actions may be taken even if they are opposed by our other shareholders.

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Item 1B.     Unresolved Staff Comments

None.

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Item 2.    Properties

As of July 31, 2016, our primary U.S. facility, which houses our research and design function, as well as elements of marketing and administration, is located in Sunnyvale, California. We conduct our manufacturing, research and development, sales and marketing and administration in Asia and North America. We lease all properties used in our business except the wafer fabrication facility in Oregon acquired in January 2012. The following table sets forth the location, size and primary use of our properties:

Location	Square Footage	Primary Use
475 Oakmead Parkway Sunnyvale, California, USA 94085	57,000	Research and development, marketing, sales and administration
3131 Northeast Brookwood Parkway Hillsboro, Oregon, USA 97124	245,000	Wafer fabrication facility
Unit 701 Tesbury Centre, 28 Queen's Road East, Wanchai, Hong Kong	1,188	Sales and distribution
Room 68, 27 Andar Centro Comercial Praia Grande no. 429 Avenida da Praia Grande, Macau	81	Manufacturing support
Building 8/9, No. 91, Lane 109, Rongkang Road, Songjiang District, Shanghai, China 201614	194,269	Packaging and testing, manufacturing support
Building B1, Dongkai Industrial Park, Songjiang Export Process Zone, Area B, Songjiang, Shanghai, China 201614	247,789	Packaging and testing, manufacturing support
Room 1002-1005, Building 1 Jiali BuYeCheng No. 218 Tianmu W. Road Zhabei District, Shanghai, China 200070	6,251	Marketing and field application engineering support
East 10F., Matshunichi Building, No.9996 Shennan Blvd, Shenzhen High-tech Park, Nanshan District, Shenzhen, China 518057	7,097	Marketing and field application engineering support
9F, No.292, Yangguang St., Neihu Dist., Taipei City 11491, Taiwan R.O.C.	17,642	Marketing and field application engineering support, research and development
7F, Unit 3 & 5, 16F, Unit 1, No.32, Gaotie 2nd Rd., Zhubei City, Hsinchu County 30274, Taiwan R.O.C.	9,443	Research and development
10th Floor, Bandi Building, Bongeunsa-ro 114, Gangnam-gu, Seoul, Korea, 135-907	2,500	Marketing and field application engineering support
Innovalley C-801 253, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Korea, 463-400	1,679	Marketing and field application engineering support
10F, Koujimachi Sunrise Building, Koujimachi 2-2-31, Chiyoda-ku, Tokyo, Japan 102-0083	884	Marketing and field application engineering support

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We believe that our current facilities are adequate and that additional space will be available on commercially reasonable terms for the foreseeable future.

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Item 3. Legal Proceedings

We are currently not a party to any material legal proceedings. We have in the past, and may from time to time in the future, become involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, we could incur significant costs in the defense thereof or could suffer adverse effects on our operations.

Item 4.         Mine Safety Disclosures

Not Applicable.

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PART II

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Price of Our Common Shares

Our common shares have traded on the NASDAQ Global Market since April 29, 2010 under the symbol AOSL. The following table sets forth, for the periods indicated, the high and low sales prices of our common share as reported by the NASDAQ Global Market.

2015
First Fiscal Quarter :	July 1, 2014 - September 30, 2014	$	10.82	$	9.07
Second Fiscal Quarter:	October 1, 2014 - December 31, 2014	$	9.68	$	8.38
Third Fiscal Quarter:	January 1, 2015- March 31, 2015	$	9.27	$	8.69
Fourth Fiscal Quarter:	April 1, 2015 - June 30, 2015	$	9.14	$	8.16
2016
First Fiscal Quarter :	July 1, 2015 - September 30, 2015	$	8.94	$	6.99
Second Fiscal Quarter:	October 1, 2015 - December 31, 2015	$	9.88	$	7.88
Third Fiscal Quarter:	January 1, 2016- March 31, 2016	$	11.98	$	8.23
Fourth Fiscal Quarter:	April 1, 2016 - June 30, 2016	$	14.76	$	11.79

Holders of Our Common Shares

As of July 31, 2016, there were approximately 112 holders of record of our common shares, not including those shares held in street or nominee name.

Dividend Policy

We have never declared or paid cash dividends on our common shares. We currently intend to retain all available funds and any future earnings for use in the operation of our business and do not anticipate paying any dividends on our common share in the foreseeable future. Any future determination to declare dividends will be made at the discretion of our board of directors and will depend on our financial condition, operating results, capital requirements, general business conditions and other factors that our board of directors may deem relevant.

Securities Authorized for Issuance Under Equity Compensation Plans

See Item 12 of Part III of this report regarding information about securities authorized for issuance under our equity compensation plans.

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Share Performance Graph

The following graph compares the total cumulative shareholder return on our common shares with the total cumulative return of the NASDAQ Composite Index and the Philadelphia Semiconductor Index for the period from April 29, 2010 (the date our common share commenced trading on the NASDAQ Global Market) through June 30, 2016, the end of our last fiscal year. The graph assumes an investment of $100 on April 29, 2010 and the reinvestment of any dividends for NASDAQ Composite Index and Philadelphia Semiconductor Index.

The comparisons in the graph below are required by the SEC and are not intended to forecast or be indicative of possible future performance of our common shares.

The above Stock Performance Graph and related information shall not be deemed “soliciting material” or to be “filed” with the Securities and Exchange Commission, nor shall such information be incorporated by reference into any future filing under the Securities Act of 1933 or Securities Exchange Act of 1934, each as amended, except to the extent that the Company specifically incorporates it by reference into such filing.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

In April 2015, our Board of Directors of the Company approved an increase in the remaining available amount under the Company’s then existing share repurchase program from approximately $17.8 million to $50.0 million. Under this program, the repurchases may be made from the open market pursuant to a pre-established Rule 10b5-1 trading plan (as amended, the "Repurchase Trading Plan") or through privately negotiated transactions. The amount and timing of any repurchases depend on a number of factors, including but not limited to, the trading price, volume and availability of our common shares, applicable legal requirements, our business and financial conditions an general market environment. There is no guarantee that any repurchases under the program will be made or that such repurchases would enhance the value of our shares.

In June 2015, the Company commenced a modified Dutch auction tender offer (the "Tender Offer") to repurchase an aggregate of $30.0 million of its outstanding common shares with a price range between $8.50 and $9.20 per share. In July 2015, the Company completed the Tender Offer in which it purchased 3,296,703 shares of its common shares, at a purchase price of $9.10 per share, for an aggregate purchase price of $30.0 million, excluding fees and expenses relating to the Tender Offer. These shares represented approximately 12.53% of the total number of the Company's common shares issued and outstanding as of June 30, 2015. The Tender Offer was part of the $50.0 million share repurchase program approved by the Board in April 15, 2015.

There was no purchase of equity securities by the Company or affiliated purchasers during the fourth quarter of fiscal year 2016.

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Item 6.Selected Financial Data

We have derived the selected consolidated statements of operations data for the fiscal years ended June 30, 2016, 2015 and 2014 and selected consolidated balance sheet data as of June 30, 2016 and 2015 from our audited consolidated financial statements and related notes included elsewhere in this report. We have derived the selected consolidated statements of operations data for the fiscal years ended June 30, 2013 and 2012 and selected consolidated balance sheets as of June 30, 2014, 2013 and 2012 from consolidated financial statements not included in this report. The information set forth below is not necessarily indicative of results of future operations, and should be read in conjunction with Item 7, “Management's Discussion and Analysis of Financial Condition and Results of Operations” in this Annual Report on Form 10-K.

	Year Ended June 30,
	2016			2015				2014				2013				2012
	(in thousands, except per share data)
Consolidated Statements of Operations:
Revenue	$	335,661		$	327,935			$	318,121			$	337,436			$	342,291
Cost of goods sold	269,839			267,453				259,050				272,851				259,126
Gross profit	65,822			60,482				59,071				64,585				83,165
Operating expenses:
Research and development	26,006			27,075				24,409				27,833				30,630
Selling, general and administrative	37,874			37,625				34,554				35,948				35,678
Impairment of long-lived assets	432			—				—				2,557				—
Total operating expenses	64,312			64,700				58,963				66,338				66,308
Operating income (loss)	1,510			(4,218		)		108				(1,753		)		16,857
Interest income and other income (loss), net	(498		)	533				(177		)		535				(17		)
Interest expense	(23		)	(181		)		(266		)		(356		)		(342		)
Income (loss) before income taxes	989			(3,866		)		(335		)		(1,574		)		16,498
Income tax expense	4,021			3,897			(1)	2,769			(1)	3,852			(1)	3,581
Net loss including noncontrolling interest	(3,032		)	(7,763		)		(3,104		)		(5,426		)		12,917
Net loss attributable to noncontrolling interest	(104		)	—				—				—				—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)		$	(3,104	)		$	(5,426	)		$	12,917
Basic	$	(0.13	)	$	(0.29	)		$	(0.12	)		$	(0.21	)		$	0.52
Diluted	$	(0.13	)	$	(0.29	)		$	(0.12	)		$	(0.21	)		$	0.50
Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net income (loss) per share:
Basic	22,452			26,429				25,952				25,348				24,656
Diluted	22,452			26,429				25,952				25,348				25,606

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	As of June 30,
	2016		2015			2014			2013			2012
	(in thousands)
Consolidated Balance Sheet Data:
Cash and cash equivalents	$	87,774	$	106,085		$	117,788		$	92,406		$	82,166
Working Capital	$	118,450	$	147,351	(1) (2)	$	151,322	(1)(2)	$	149,335	(1) (2)	$	127,073
Total assets	$	318,505	$	347,904	(1) (2)	$	362,925	(1)(2)	$	354,166	(1) (2)	$	365,574
Bank borrowings - long term	$	—	$	—		$	—		$	13,571		$	16,429
Capital leases - long term	$	1,695	$	64		$	1,005		$	195		$	1,085
Total shareholders' equity	$	242,142	$	276,639		$	283,388		$	281,600		$	279,393

(1) During the quarter ended March 31, 2016, we identified and recorded immaterial errors related to the fiscal years ended June 30, 2015, 2014 and 2013.  The immaterial errors resulted from overstatement of long-term deferred income tax liabilities and income tax expenses. The adjustments resulted in a decrease in net loss of $172,000, $204,000 and $149,000 for the years ended June 30, 2015, 2014 and 2013, respectively and a decrease in basic and diluted net loss per common share of $0.01 for the years ended June 30, 2015, 2014 and 2013. The impact to the consolidated balance sheets as of June 30, 2015, 2014 and 2013 was a decrease in deferred income tax liabilities of $525,000, $353,000 and $149,000, respectively and an increase in retained earnings by the same amounts.

(2) During the quarter ended June 30, 2016, we early adopted ASU 2015-17, Balance Sheet Classification of Deferred Taxes, and have made the necessary conforming reclassifications to the accompanying consolidated balance sheet data. The application of the provisions of ASU 2015-17 resulted in a $2.2 million, $2.8 million, and $3.0 million reduction in current deferred tax assets, a $1.5 million, $1.4 million, and $0.9 million increase in long-term deferred income tax assets and a $0.7 million, $1.4 million and $2.2 million reduction in non-current deferred income tax liabilities at June 30, 2015, 2014 and 2013, respectively.

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Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion of the financial condition and results of our operations in conjunction with our consolidated financial statements and the notes to those statements included elsewhere in this annual report. Our consolidated financial statements contained in this annual report are prepared in accordance with U.S. GAAP.

Overview

We are a designer, developer and global supplier of a broad portfolio of power semiconductors. Our portfolio of power semiconductors includes approximately 1,600 products, and has grown significantly with the introduction of over 90 new products during each of the fiscal years ended June 30, 2016, 2015 and 2014. Our teams of scientists and engineers have developed extensive intellectual properties and technical knowledge that encompass major aspects of power semiconductors, which we believe it enables us to introduce and develop innovative products to address the increasingly complex power requirements of advanced electronics. We have an extensive patent portfolio that consists of 601 patents and 150 patent applications in the United States as of June 30, 2016. We differentiate ourselves by integrating our expertise in technology, design and advanced manufacturing and packaging to optimize product performance and cost. Our portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment.

Our business model leverages global resources, including research and development and manufacturing in the United States and Asia. Our sales and technical support teams are localized in several growing markets. We operate a 200mm wafer fabrication facility located in Hillsboro, Oregon, or the Oregon fab, which is critical for us to accelerate proprietary technology development, new product introduction and improve our financial performance in the long run. To meet the market demand for the more mature high volume products, we also utilize the wafer manufacturing capacity of selected third party foundries. For assembly and test, we primarily rely upon our in-house facilities in China. In addition, we utilize subcontracting partners for industry standard packages. We believe our in-house packaging and testing capability provides us with a competitive advantage in proprietary packaging technology, product quality, cost and sales cycle time.

On March 29, 2016, we entered into a joint venture contract (the “JV Agreement”) with two investment funds affiliated with the municipalities of Chongqing (the “Chongqing Funds”), pursuant to which we and Chongqing Funds will form a joint venture, (the “JV Company”), for the purpose of constructing a power semiconductor packaging, testing and wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company will be $330.0 million (the “Initial Capitalization”).  The Initial Capitalization will be completed in stages commencing on the incorporation of the JV Company.  We own 51%, and the Chongqing Funds owns 49%, of the equity interest in the JV Company. In July 2016, Chongqing Funds contributed $33.0 million to the JV Company. We expect the JV company to commence its initial production in the first half of fiscal 2018. Over the long term, the JV Company expects to construct a 12-inch wafer fabrication facility for the production of power semiconductors. We expect the joint venture to deliver significant cost savings as well as drive meaningful improvements in working capital and capital expenditures.

During the fiscal year ended June 30, 2016, we continued our diversification program by developing new silicon and packaging platforms to expand our serviceable available market, or SAM and offer higher performance products. Our metal-oxide-semiconductor field-effect transistors, or MOSFET, portfolio expanded significantly across a full range of voltage applications. For example, during the fourth quarter of fiscal year of 2016, we introduced Best-In-Class DrMOS-IV Power Modules with an EZPair™ package. The new device enables high power density voltage regulator solutions ideal for Notebook PCs, servers, and graphic cards applications. We also released 8 new products in the 60V MOSFET family. These products are designed for synchronous rectification in flyback converters, used in quick chargers for smart phones and other portable devices. Moreover, we launched a second generation of Constant On-Time (COT) buck converters which provides an effective solution for next generation computing chipsets that are pushing the limits of DC/DC converter size. In addition, we introduced our first 2.38 mOhm device for battery protection. This new device offers the best-in-class source-to-source on-resistance (Rsson), giving the battery protection circuit designer the lowest voltage drop and temperature rise in the protection circuit module. During the second quarter of fiscal year of 2016, we introduced the industry's first single n-channel 45V MOSFET with an ultra-low on-resistance of 1.15Ohms at 10V. This addition to our medium voltage product portfolio is designed to address a wide range of applications including secondary-side synchronous rectification in AC/DC and DC/DC converters, as well as industrial and motor drive applications. We also released AOC3864, a common-drain 20V dual n-channel MOSFET with an ultra-low on-resistance of 5.7mOhms at 4.5V. This new device offers the best approach in designing battery protection circuit modules, while providing a strong and reliable solution. In addition, we introduced the new generation of high efficiency PairFETs. The AOE6930 is an asymmetric package with integrated high-side and low-side MOSFETs. The product is designed with our latest silicon technology to optimize the conducting resistance and the switching characteristics of both MOSFETs in order to attain the highest efficiency over the whole output range when working as the

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power stage for a Vcore power supply circuit. The combination of AOS's XSFET™ technology in this new generation PairFET package, gives the device an extra advantage in thermal dissipation. Moreover, we released the AOZ3101, a high efficiency, simple-to-use synchronous buck regulator, with an operating input voltage range from 4.5V to 18V, supplying 2A of continuous current. The device offers a low on-resistant power stage in a thermally enhanced 3mm x 3mm DFN package, allowing cooler power conversion for a variety of consumer electronics application such as LCD TVs, set-top boxes, as well as DVD players and recorders. During the first quarter of fiscal year of 2016, we released AO4294, the latest addition to our family of high efficiency charging solutions. This new device is offered in an easy-to-use SO-8 package, which helps manufacturers keep the mounting cost low, while still getting the best efficiency and power dissipation possible. The AO4294 is an ideal solution for synchronours rectification in high efficiency chargers and adapters for mobile devices. We also released AOZ3053, a 5A EZBuck DC/DC regulator with smart mode adaption functions, available in a thermally enhanced exposed pad SO-8 package. The AOZ3053 is the first of this new smart platform, which allows for more thermally efficient DC/DC solutions for consumer, networking and industrial applications such as LCD TVs, set-top boxes, cable modems, and power supplies.

Factors affecting our performance

Our performance is affected by several key factors, including the following:

The global, regional economic and PC market conditions: Because our products primarily serve consumer electronic applications, a deterioration of the global and regional economic conditions could materially affect our revenue and results of operations. In particular, because a significant amount of our revenue is derived from sales of products in the personal computer, or PC markets, such as notebooks, motherboards and notebook battery packs, a significant decline or downturn in the PC markets can have a material adverse effect on our revenue and results of operations.  Our revenue from the PC markets accounted for approximately 38.5%, 47.1% and 45.2% of our total revenue for the years ended June 30, 2016, 2015 and 2014, respectively.

We have experienced a significant global decline in the PC markets due to continued growth of demand in tablets and smart phones, worldwide economic conditions and the industry inventory correction which had and may continue to have a material negative impact on the demand for our products, revenue, factory utilization, gross margin, our ability to resell excess inventory, and other performance measures. In response to this trend, we have been and are continuing to execute our strategies to diversify our product portfolio, penetrate into other market segments, including the consumer, communications and industrial markets, improve gross margin and profit by implementing cost control measures. We are making progress in reducing our reliance on the computing market, and we are also committed to continue to support our computing business and capitalize on the opportunity with a more focused and competitive PC product strategy. However, as we develop and sell new products that serve more diversified markets, we expect that sales based on the PC markets, as a percentage of the total revenue, will continue to decline. If the rate of decline in the PC markets is faster than we expected, or if we cannot successfully diversify or introduce new products to keep pace with the declining PC markets, we may not be able to alleviate its negative impact, which will adversely affect our results of operations.

Manufacturing Costs:  Our gross margin may be affected by our manufacturing costs, including utilization of our manufacturing facilities, pricing of wafers from third party foundries and semiconductor raw materials, which may fluctuate from time to time largely due to the market demand and supply.  Capacity utilization affects our gross margin because we have certain fixed costs associated with our packaging and testing facilities and our Oregon fab.  If we are unable to utilize our manufacturing facilities at a desired level, our gross margin may be adversely affected.  In addition, we expect that in the long term our joint venture agreement with the Chongqing Funds will reduce our costs of manufacturing. However, our manufacturing costs may increase in the short term prior to the commencement of operation of the JV Company, because we may be required to incur additional costs to acquire packaging and testing capacity in order make up for the reduced capacity during the period in which we transfer our equipments from Shanghai to Chongqing.

Erosion of average selling price: Erosion of average selling prices of established products is typical in our industry. Consistent with this historical trend, we expect that average selling prices of our existing products will continue to decline in the future. However, as a normal course of business, we seek to offset the effect of declining average selling prices by introducing new and higher value products, expanding existing products for new applications and new customers, and reducing manufacturing cost of existing products.

Product introductions and customers' product requirements: Our success depends on our ability to introduce products on a timely basis that meet or are compatible with our customers' specifications and performance requirements. Both factors, timeliness of product introductions and conformance to customers' requirements, are equally important in securing design wins with our customers. As we accelerate the development of new technology platforms, we expect to increase the pace at which

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we introduce new products and obtain design wins. Our failure to introduce new products on a timely basis that meet customers' specifications and performance requirements, particularly those products with major OEM customers, and our inability to continue to expand our serviceable markets, could adversely affect our financial performance, including loss of market share. We expect our joint venture with Chongqing Funds to commence operation in July 2017, and we believe that the joint venture will increase and diversify our customer base, particularly in China, in the long term. However, there is no guarantee that the joint venture will commence timely or at all. Even if we are able to commence operation, we may not be successful in acquiring a sufficient number of new customers to offset the additional costs due to various factors, including but are not limited to, competition from other semiconductor companies in the region, our lack of history and prior relationships with customers as a new entrant, difficulties in executing our joint venture strategies, lack of control over our operations and the general economic conditions in Chongqing and China.

Distributor ordering patterns and seasonality: Our distributors place purchase orders with us based on their forecasts of end customer demand, and this demand may vary significantly depending on the sales outlook and market and economic conditions of end customers. Because these forecasts may not be accurate, channel inventory held at our distributors may fluctuate significantly, which in turn may prompt distributors to make significant adjustments to their purchase orders placed with us. As a result, our revenue and operating results may fluctuate significantly from quarter to quarter. In addition, because our products are used in consumer electronics products, our revenue is subject to seasonality. Our sales seasonality is affected by numerous factors, including global and regional economic conditions as well as the PC market conditions, revenue generated from new products, changes in distributor ordering patterns in response to channel inventory adjustments and end customer demand for our products and fluctuations in consumer purchase patterns prior to major holiday seasons. In recent periods, broad fluctuations in the semiconductor markets and the global and regional economic conditions, in particular the decline of the PC market conditions, have had a more significant impact on our results of operations than seasonality.

Principal line items of statements of income

The following describes the principal line items set forth in our consolidated statements of operations:

Revenue

We generate revenue primarily from the sale of power semiconductors, consisting of power discretes and power ICs. Historically, a majority of our revenue was derived from power discrete products and a smaller amount was derived from power IC products. Because our products typically have three-year to five-year life cycles, the rate of new product introduction is an important driver of revenue growth over time. We believe that expanding the breadth of our product portfolio is important to our business prospects, because it provides us with an opportunity to increase our total bill-of-materials within an electronic system and to address the power requirements of additional electronic systems. In addition, a small percentage of our total revenue is generated by providing packaging and testing services to third-parties through one of our subsidiaries.

Our product revenue includes the effect of the estimated stock rotation returns and price adjustments that we expect to provide to our distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of products purchased by the distributor during a specified period. At our discretion or upon our direct negotiations with the original design manufacturers ("ODMs") or original equipment manufacturers ("OEMs"), we may elect to grant special pricing that is below the prices at which we sold our products to the distributors. In these situations, we will grant price adjustments to the distributors reflecting such special pricing. We estimate the price adjustments for inventory at the distributors based on factors such as distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for our products.

Cost of goods sold

Our cost of goods sold primarily consists of costs associated with semiconductor wafers, packaging and testing, personnel, including share-based compensation expense, overhead attributable to manufacturing, operations and procurement, and cost associated with yield improvements, capacity utilization, warranty and inventory reserves. As the volume of sales increases, we expect cost of goods sold to increase. We implemented a process to improve our factory capacity utilization rates by transferring more wafer production to our Oregon fab and reducing our reliance on outside foundries. While our utilization rates cannot be immune to the market conditions, our goal is to make them less vulnerable to market fluctuations. We believe our market diversification strategy and product growth will drive higher volume of manufacturing which will improve our factory utilization rates and gross margin in the long run.

Operating expenses

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Our operating expenses consist of research and development, selling, general and administrative expenses and impairment of long-lived assets. We expect our operating expenses as a percentage of revenue to fluctuate from period to period as we continue to exercise cost control measures in response to the declining PC market as well as align our operating expenses to the revenue level.

Research and development expenses.  Our research and development expenses consist primarily of salaries, bonuses, benefits, share-based compensation expense, expenses associated with new product prototypes, travel expenses, fees for engineering services provided by outside contractors and consultants, amortization of software and design tools, depreciation of equipment and overhead costs. We continue to invest in developing new technologies and products utilizing our own fabrication and packaging facilities as it is critical to our long-term success. We also evaluate appropriate investment levels and stay focused on new product introductions to improve our competitiveness. We expect that our research and development expenses will fluctuate from time to time.

Selling, general and administrative expenses.  Our selling, general and administrative expenses consist primarily of salaries, bonuses, benefits, share-based compensation expense, product promotion costs, occupancy costs, travel expenses, expenses related to sales and marketing activities, amortization of software, depreciation of equipment, maintenance costs and other expenses for general and administrative functions as well as costs for outside professional services, including legal, audit and accounting services. We expect our selling, general and administrative expenses to fluctuate in the near future as we continue to exercise cost control measures in response to the declining PC market.

Impairment of Long-Lived Assets: Long-lived assets or asset groups are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. The recoverability of an asset or asset group is assessed by determining if the carrying value of the asset or asset group exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the assets over the remaining economic life.  The impairment loss is measured based on the difference between the carrying amount and estimated fair value.

Income tax expense

We are subject to income taxes in various jurisdictions. Significant judgment and estimates are required in determining our worldwide income tax expense. The calculation of tax liabilities involves dealing with uncertainties in the application of complex tax regulations of different jurisdictions globally. We establish accruals for potential liabilities and contingencies based on a more likely than not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits us to recognize a tax benefit measured at the largest amount of tax benefit that is more than likely to be realized upon settlement. If the actual tax outcome of such exposures is different from the amounts that were initially recorded, the differences will impact the income tax and deferred tax provisions in the period in which such determination is made. Changes in the location of taxable income (loss) could result in significant changes in our income tax expense.

We record a valuation allowance against deferred tax assets if it is more likely than not that a portion of the deferred tax assets will not be realized, based on historical profitability and our estimate of future taxable income in a particular jurisdiction. Our judgments regarding future taxable income may change due to changes in market conditions, changes in tax laws, tax planning strategies or other factors. If our assumptions and consequently our estimates change in the future, the deferred tax assets may increase or decrease, resulting in corresponding changes in income tax expense. Our effective tax rate is highly dependent upon the geographic distribution of our worldwide profits or losses, the tax laws and regulations in each geographical region where we have operations, the availability of tax credits and carry-forwards and the effectiveness of our tax planning strategies.

Reclassifications and Correction of Immaterial Errors

Certain amounts previously reported in the Management's Discussion and Analysis of Financial Condition and Results of Operations section of this report have been either reclassified to conform with current presentation or restated. For a complete overview on adjustments impacting Management's Discussion and Analysis of Financial Condition and Results of Operations, see footnote 1 of this report.

Operating results

The following tables set forth our results of operations and as a percentage of revenue for the fiscal years ended June 30, 2016, 2015 and 2014. Our historical results of operations are not necessarily indicative of the results for any future period.

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	Year Ended June 30,
	2016			2015			2014			2016		2015		2014
	(in thousands)									(% of revenue)
Revenue	$	335,661		$	327,935		$	318,121		100.0	%	100.0	%	100.0	%
Cost of goods sold (1)	269,839			267,453			259,050			80.4	%	81.6	%	81.4	%
Gross profit	65,822			60,482			59,071			19.6	%	18.4	%	18.6	%
Operating expenses:
Research and development (1)	26,006			27,075			24,409			7.7	%	8.3	%	7.7	%
Selling, general and administrative (1)	37,874			37,625			34,554			11.3	%	11.5	%	10.9	%
Impairment of long-lived assets	432			—			—			0.1	%	—	%	—	%
Total operating expenses	64,312			64,700			58,963			19.1	%	19.8	%	18.6	%
Operating income (loss)	1,510			(4,218		)	108			0.5	%	(1.4	)%	—	%
Interest income and other income (loss), net	(498		)	533			(177		)	(0.1	)%	0.2	%	(0.1	)%
Interest expense	(23		)	(181		)	(266		)	—	%	(0.1	)%	(0.1	)%
Income (loss) before income taxes	989			(3,866		)	(335		)	0.4	%	(1.3	)%	(0.2	)%
Income tax expense	4,021			3,897			2,769			1.2	%	1.2	%	0.9	%
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)	(0.8	)%	(2.5	)%	(1.1	)%
Net loss attributable to noncontrolling interest	(104		)	—			—			—	%	—	%	—	%
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)	(0.8	)%	(2.5	)%	(1.1	)%

(1) Includes share-based compensation expense as follows:

	Year Ended June 30,
	2016		2015		2014		2016		2015		2014
	(in thousands)						(% of revenue)
Cost of goods sold	$	636	$	669	$	614	0.2	%	0.2	%	0.2	%
Research and development	1,115		779		786		0.3	%	0.2	%	0.2	%
Selling, general and administrative	2,562		3,042		1,975		0.8	%	0.9	%	0.6	%
	$	4,313	$	4,490	$	3,375	1.3	%	1.3	%	1.0	%

Revenue

The following is a summary of revenue by product type:

	Year Ended June 30,						Change
	2016		2015		2014		2016					2015
	(in thousands)						(in thousands)			(in percentage)		(in thousands)			(in percentage)
Power discrete	$	252,063	$	248,716	$	246,033	$	3,347		1.3	%	$	2,683		1.1	%
Power IC	69,344		63,529		53,993		5,815			9.2	%	9,536			17.7	%
Packaging and testing services	14,254		15,690		18,095		(1,436		)	(9.2	)%	(2,405		)	(13.3	)%
	$	335,661	$	327,935	$	318,121	$	7,726		2.4	%	$	9,814		3.1	%

Fiscal 2016 vs 2015

Total revenue was $335.7 million for fiscal year 2016, an increase of $7.7 million, or 2.4%, as compared to $327.9 million for fiscal year 2015. The increase consisted of $3.3 million and $5.8 million in sales of power discrete products and sales of power IC products, respectively, partially offset by a $1.4 million decrease in sales of packaging and testing services.

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The increase in power discrete and power IC products was primarily due to an 7.8% increase in average selling price as compared to last year due to a shift in product mix, partially offset by a 4.3% decrease in unit shipments. The decrease in revenue of packaging and testing services as compared to last year was primarily due to reduced demand as a result of the declining PC market. During fiscal year 2016, we accelerated the development of new technology platforms which allowed us to introduce 36 medium and high voltage MOSFET products, targeting primarily the power supply, industrial markets, and consumer, as well as 25 low voltage MOSFET products primarily for the computing and communication markets. In addition, we introduced 32 Power IC new products for consumer, industrial markets and computing applications.

Fiscal 2015 vs 2014

Total revenue was $327.9 million for fiscal year 2015, an increase of $9.8 million, or 3.1%, as compared to $318.1 million for fiscal year 2014. The increase consisted of $2.7 million and $9.5 million in sales of power discrete products and sales of power IC products, respectively, partially offset by a $2.4 million decrease in sales of packaging and testing services. The increase in power discrete and power IC products was primarily due to an 11.0% increase in unit shipments, partially offset by a 6.3% decrease in average selling price as compared to the same period of last year mainly due to selling price erosion in the computing and consumer markets and to a lesser extent, a shift in product mix. The decrease in revenue of packaging and testing services as compared to last year was primarily due to reduced demand as a result of the declining PC market.

Cost of goods sold and gross profit

	Year Ended June 30,									Change
	2016			2015			2014			2016				2015
	(in thousands)									(in thousands)		(in percentage)		(in thousands)		(in percentage)
Cost of goods sold	$	269,839		$	267,453		$	259,050		$	2,386	0.9	%	$	8,403	3.2	%
Percentage of revenue	80.4		%	81.6		%	81.4		%
Gross profit	$	65,822		$	60,482		$	59,071		$	5,340	8.8	%	$	1,411	2.4	%
Percentage of revenue	19.6		%	18.4		%	18.6		%

Fiscal 2016 vs 2015

Cost of goods sold was $269.8 million for fiscal year 2016, an increase of $2.4 million, or 0.9%, as compared to $267.5 million for fiscal year 2015. The increase was primarily due to product mix, partially offset by decrease in unit shipments. The increase was partially offset by the overall manufacturing cost reduction as compared to last fiscal year. Gross margin increased by 1.2 percentage points to 19.6% for fiscal year 2016, as compared to 18.4% for fiscal year 2015. The increase in gross margin was primarily due to better product mix and higher factory utilization. We expect our gross margin to continue to fluctuate in the future as a result of variations in our product mix, factory utilization, semiconductor wafer and raw material pricing, manufacturing labor cost and general economic and PC market conditions.

Fiscal 2015 vs 2014

Cost of goods sold was $267.5 million for fiscal year 2015, an increase of $8.4 million, or 3.2%, as compared to $259.1 million for fiscal year 2014, primarily due to increased unit shipments. The increase was partially offset by overall manufacturing cost reduction due to continued cost control efforts and improved factory utilization in fiscal year 2015, as compared to fiscal year 2014. Gross margin decreased by 0.2 percentage points to 18.4% for fiscal year 2015, as compared to 18.6% for fiscal year 2014. The slight decrease in gross margin was primarily due to reduced average selling price as a result of price erosion, partially offset by the positive impact of improved factory utilization and continued cost reduction efforts during the fiscal year 2015.

Research and development expenses

	Year Ended June 30,						Change
	2016		2015		2014		2016					2015
	(in thousands)						(in thousands)			(in percentage)		(in thousands)		(in percentage)
Research and development	$	26,006	$	27,075	$	24,409	$	(1,069	)	(3.9	)%	$	2,666	10.9	%

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Fiscal 2016 vs 2015

Research and development expenses were $26.0 million for fiscal year 2016, a decrease of $1.1 million, or 3.9%, as compared to $27.1 million for fiscal year 2015. The decrease was primarily attributable to a $0.8 million decrease in product prototyping engineering expenses as a result of reduced engineering activities, a $0.2 million decrease in employee travel expenses and a $0.1 million decrease in facilities related costs as a result of continued operational and cost control efforts. We continue to evaluate and invest resources in developing new technologies and products utilizing our own fabrication and packaging facilities. However, we expect that our research and development expenses will fluctuate from time to time.

Fiscal 2015 vs 2014

Research and development expenses were $27.1 million for fiscal year 2015, an increase of $2.7 million, or 10.9%, as compared to $24.4 million for fiscal year 2014. The increase was primarily attributable to a $3.4 million increase in product prototyping engineering expenses, partially offset by a $0.1 million decrease in employee compensation and benefit expenses primarily due to reduction of headcount and less bonus during fiscal year 2015, a $0.1 million decrease in depreciation and amortization expense as a result of increased fully depreciated assets, a $0.2 million decrease in facilities and utilities related costs primarily due to continued operational and cost control effort, and a $0.2 million decrease in legal and consulting expense due to reduced consulting activities.

Selling, general and administrative expenses

	Year Ended June 30,						Change
	2016		2015		2014		2016				2015
	(in thousands)						(in thousands)		(in percentage)		(in thousands)		(in percentage)
Selling, general and administrative	$	37,874	$	37,625	$	34,554	$	249	0.7	%	$	3,071	8.9	%

Fiscal 2016 vs 2015

Selling, general and administrative expenses were $37.9 million for fiscal year 2016, an increase of $0.2 million, or 0.7%, as compared to $37.6 million for fiscal year 2015. The increase was primarily due to a $1.1 million increase in employee compensation and benefits expense as a result of increased headcount and higher bonus expenses during current fiscal year, as well as a $0.1 million of long term asset write-off, partially offset by a $0.5 million decrease in depreciation and amortization expense as a result of certain assets being fully depreciated in fiscal year of 2016, and a $0.4 million decrease in legal expenses as a result of less legal consulting activities.

During the quarter ended June 30, 2016, we recognized $0.2 million of expenses related to our joint venture, including noncontrolling interest, in our general and administrative expenses in connection with outside profession services, travel and personnel and benefit related costs.

Fiscal 2015 vs 2014

Selling, general and administrative expenses were $37.6 million for fiscal year 2015, an increase of $3.1 million, or 8.9%, as compared to $34.6 million for fiscal year 2014. The increase was primarily due to a $1.8 million increase in employee compensation and benefits expense as a result of increased headcount during fiscal year 2015, a $1.1 million increase in share-based compensation expense primarily as a result of an increase of stock awards granted and a decrease of cancellation during the fiscal year 2015, and a $0.4 million in recovery of doubtful accounts in fiscal year 2014 as a result of continued effort in collection from a service customer. These increases were partially offset by a $0.3 million decrease in depreciation and amortization expense as a result of certain assets being fully depreciated in fiscal year of 2015.

Impairment of long-lived assets

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	Year Ended June 30,						Change
	2016		2015		2014		2016				2015
	(in thousands)						(in thousands)		(in percentage)		(in thousands)		(in percentage)
Impairment of long-lived assets	$	432	$	—	$	—	$	432	100.0	%	$	—	—	%

During the quarter ended December 31, 2015, we identified certain manufacturing equipments purchased for projects that were subsequently canceled. Because the equipments had no alternative uses, we recorded an asset impairment expense of approximately $0.4 million related to these equipments during the quarter ended December 31, 2015.

During the fourth quarter of fiscal year 2016 and 2015, we evaluated our amortizable intangible assets for impairment and determined that the related estimated undiscounted cash flows exceeded the carrying value of the intangible assets and no impairment charge was recorded. During the same period, we also evaluated our goodwill for impairment and determined that the fair value of the reporting unit, estimated based on the market capitalization approach, was more than its carrying value and no impairment charge was recorded.

Interest income and other income (loss), net

	Year Ended June 30,								Change
	2016			2015		2014			2016					2015
	(in thousands)								(in thousands)			(in percentage)		(in thousands)		(in percentage)
Interest income and other income (loss), net	$	(498	)	$	533	$	(177	)	$	(1,031	)	(193.4	)%	$	710	(401.1	)%

Interest income and other, net was primarily related to interest earned from cash and cash equivalents, as well as foreign exchange gains (losses). The decrease in interest income and other in fiscal year 2016 as compared to fiscal year 2015 was primarily due to unrealized foreign exchange losses of $1.0 million mainly due to recent depreciation of USD against RMB. The increase in interest income and other in fiscal year 2015 as compared to fiscal year 2014 was primarily due to unrealized foreign exchange gains of $0.7 million mainly due to appreciation of USD against RMB.

Interest Expense

	Year Ended June 30,						Change
	2016		2015		2014		2016					2015
	(in thousands)						(in thousands)			(in percentage)		(in thousands)			(in percentage)
Interest expense	$	23	$	181	$	266	$	(158	)	(87.3	)%	$	(85	)	(32.0	)%

Interest expense was primarily related to bank borrowings. The decrease in interest expenses in fiscal year 2016 compared to fiscal year of 2015 was primarily due to decreases in bank borrowings related to the $20.0 million term loan obtained in May 2012 for our Oregon fab. The term loan was fully repaid in May 2015.

Income tax expense

	Year Ended June 30,						Change
	2016		2015		2014		2016				2015
	(in thousands)						(in thousands)		(in percentage)		(in thousands)		(in percentage)
Income tax expense	$	4,021	$	3,897	$	2,769	$	124	3.2	%	$	1,128	40.7	%

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Fiscal 2016 vs 2015

Income tax expense for fiscal years 2016 and 2015 was $4.0 million and $3.9 million, respectively. Income tax expense increased by $0.1 million, or 3.2%, in fiscal year 2016 as compared to fiscal year 2015 primarily due to the changes in the mix of earnings in various geographic jurisdictions as well as a decrease in the recognition of previously unrecognized tax benefits following the lapse of the applicable statue of limitations between the respective periods.

Fiscal 2015 vs 2014

Income tax expense for fiscal years 2015 and 2014 was $3.9 million and $2.8 million, respectively. Income tax expense increased by $1.1 million, or 40.7%, in fiscal year 2015 as compared to fiscal year 2014 primarily due to the changes in the mix of earnings in various geographic jurisdictions as well as a decrease in the recognition of previously unrecognized tax benefits following the lapse of the applicable statue of limitations between the respective periods.

Liquidity and Capital Resources

Our principal need for liquidity and capital resources is to maintain sufficient working capital to support our operations and to invest adequate capital expenditures to fuel the growth of our business. Currently, we primarily finance our operations and capital expenditures through funds generated from operations.

In March 2016, we entered into the JV agreement, which the Initial Capitalization will be $330.0 million. In July 2016, Chongqing Funds contributed $33.0 million to the JV Company. Within one year from June 30,2016, we expect to contribute $10.0 million cash, equipments and intangible assets. Over the long term, the JV Company expects to construct a 12-inch wafer fabrication facility by the Initial Capitalization.

In April 2015, our Board of Directors of the Company approved an increase in the remaining available amount under the Company’s share repurchase program from approximately $17.8 million to $50.0 million. The repurchases were made from the open market pursuant to a pre-established Rule 10b5-1 trading plan (as amended, the "Repurchase Trading Plan") or through privately negotiated transactions. The amount and timing of any repuchases depend on a number of factors, including but not limited to, the trading price, volume and availability of our common shares, applicable legal requirements, our business and financial conditions an general market environment. There is no guarantee that any repurchases under the Program will enhance the value of our shares.

In June 2015, we commenced a modified Dutch auction tender offer (the "Tender Offer") to repurchase an aggregate of $30.0 million of our outstanding common shares with a price range between $8.50 and $9.20 per share. In July 2015 we completed the Tender Offer in which we purchased 3,296,703 shares of its common shares, at a purchase price of $9.10 per share, for an aggregate purchase price of $30.0 million, excluding fees and expenses relating to the Tender Offer. These shares represent approximately 12.53% of the total number of the Company's common shares issued and outstanding as of June 30, 2015. The Tender Offer was part of the $50.0 million share repurchase program approved by the Board in April 15, 2015. Immediately following the completion of the Tender Offer, approximately $18.2 million remained available under the share repurchase program.

During fiscal year 2016 we repurchased an aggregate of 4,695,499 shares from the open market under the Repurchase Trading Plan for a total cost of $41.8 million, at an average price of $8.90 per share, excluding fees and related expenses of $0.3 million. Since the inception of the program in 2010, we repurchased an aggregate of 5,723,093 shares from the open market under the Repurchase Trading Plan for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses of $0.3 million. No repurchased shares have been retired. Shares repurchased are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. As of June 30, 2016, of the 5,723,093 repurchased shares, 71,803 shares with a weighted average repurchase price of $12.33 per share, were reissued at an average price of $4.28 per share for option exercises and vested restricted share units.    

The Chinese government imposes certain currency exchange controls on cash transfers out of China. Regulations in China permit foreign owned entities to freely convert the Renminbi into foreign currency for transactions that fall under the "current account," which includes trade related receipts and payments, and interests. Accordingly, our Chinese subsidiaries may use Renminbi to purchase foreign exchange currency for settlement of such "current account" transactions without pre-approval.

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Other transactions that involve conversion of Renminbi into foreign currency are classified as "capital account" transactions. Examples of "capital account" transactions include repatriations of investments by or dividends to foreign owners. Pursuant to applicable regulations, foreign-invested enterprises in China may pay dividends only out of their accumulated profits, if any, determined in accordance with Chinese accounting standards and regulations. In calculating accumulated profits, foreign investment enterprises in China are required to allocate at least 10% of their profits each year, if any, to fund the equity reserve account unless the reserve has reached 50% of the registered capital of the enterprises. "Capital account" transactions require prior approval from China's State Administration of Foreign Exchange (SAFE) or its provincial branch to convert a remittance into a foreign currency, such as U.S. dollars, and transmit the foreign currency outside of China. As a result of this and other restrictions under PRC laws and regulations, our China subsidiaries are restricted in their ability to transfer a portion of their net assets to the parent.  As of June 30, 2016 and 2015, such restricted portion amounted to approximately $84.2 million and $86.8 million, or 34.8% and 31.4%, of our total consolidated net assets, respectively.

We believe that our current cash and cash equivalents and cash flows from operations will be sufficient to meet our anticipated cash needs, including working capital and capital expenditures, for at least the next twelve months. In the long-term, we may require additional capital due to changing business conditions or other future developments, including any investments or acquisitions we may decide to pursue. If our cash is insufficient to meet our needs, we may seek to raise capital through equity or debt financing. The sale of additional equity securities could result in dilution to our shareholders. The incurrence of indebtedness would result in increased debt service obligations and may include operating and financial covenants that would restrict our operations. We cannot be certain that any financing will be available in the amounts we need or on terms acceptable to us, if at all.

Cash and cash equivalents

As of June 30, 2016 and 2015, we had $87.8 million and $106.1 million of cash and cash equivalents, respectively. Our cash and cash equivalents primarily consist of cash on hand and short-term bank deposits with original maturities of three months or less. Of the $87.8 million and $106.1 million cash and cash equivalents, $59.6 million and $60.0 million, respectively, are deposited with financial institutions outside the United States.

The following table shows our cash flows from operating, investing and financing activities for the periods indicated:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Net cash provided by operating activities	$	40,182		$	27,669		$	37,960
Net cash used in investing activities	(21,721		)	(21,345		)	(9,191		)
Net cash used in financing activities	(36,686		)	(17,980		)	(3,397		)
Effect of exchange rate changes on cash and cash equivalents	(86		)	(47		)	10
Net increase (decrease) in cash and cash equivalents	$	(18,311	)	$	(11,703	)	$	25,382

Cash flows from operating activities

Net cash provided by operating activities of $40.2 million for fiscal year 2016 resulted primarily from net loss of $3.0 million, non-cash charges of $33.0 million and net change in assets and liabilities providing net cash of $10.2 million. The non-cash charges of $33.0 million included depreciation and amortization expenses of $27.3 million, share-based compensation expense of $4.3 million, net deferred income taxes of $0.9 million, loss on disposal of property and equipment of $0.1 million, and impairment of long-lived assets of $0.4 million. The net change in assets and liabilities providing net cash of $10.2 million was primarily due to $12.2 million decrease in accounts receivable due to timing of billings and collection of payments. $3.2 million increase in accrued and other liabilities, and $1.0 million increase in income taxes payable, partially offset by $4.7 million increase in inventories, $1.2 million decrease in accounts payable primarily due to timing of payment, and $0.5 million increase in other current and long-term assets primarily due to increase in advance payments to suppliers.

Net cash provided by operating activities of $27.7 million for fiscal year 2015 resulted primarily from net loss of $7.8 million, non-cash charges of $32.5 million and net change in assets and liabilities providing net cash of $3.0 million. The non-cash charges of $32.5 million included depreciation and amortization expenses of $27.5 million, share-based compensation expense of $4.5 million, and net deferred income taxes of $0.8 million, partially offset by a $0.3 million of forgiveness of the loan from the State of Oregon and a $0.1 million of gain on disposal of property and equipment during the fiscal year 2015. The net change in assets and liabilities providing net cash of $3.0 million was primarily due to $2.4 million decrease in

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inventories as we reduced our inventories, $3.3 million increase in accounts payable primarily due to timing of payment, and $1.3 million increase in accrued and other liabilities, partially offset by $2.2 million increase in accounts receivable due to the timing of billings and collection of payments, $1.3 million decrease in income taxes payable, and $0.5 million increase in other current and long-term assets primarily due to increase in advance payments to suppliers.

Net cash provided by operating activities of $38.0 million for fiscal year 2014 resulted primarily from net loss of $3.1 million, non-cash charges of $31.3 million and net change in assets and liabilities providing net cash of $9.8 million. The non-cash charges of $31.3 million included depreciation and amortization expenses of $27.9 million, share-based compensation expense of $3.4 million, and net deferred income taxes of $0.6 million, partially offset by allowance for doubtful account of $0.4 million and gain on disposal of property and equipment of $0.2 million during the fiscal year 2014. The net change in assets and liabilities providing net cash of $9.8 million was primarily due to $1.8 million decrease in inventories as we reduced our inventories, $2.1 million decrease in accounts receivable due to the timing of billings and collection of payments, $5.5 million increase in accounts payable primarily due to increase in inventory purchase and timing of payment, and $2.7 million increase in accrued and other liabilities primarily related to employee compensation and performance bonuses, partially offset by $0.9 million decrease in income taxes payable, and $1.4 million increase in other current and long-term assets primarily due to increase in advance payments to suppliers.

Cash flows from investing activities

Net cash used in investing activities of $21.7 million for the fiscal year 2016 was primarily attributable to $21.9 million purchase of property and equipment to increase our in-house production capacity.

Net cash used in investing activities of $21.3 million for the fiscal year 2015 was primarily attributable to $21.5 million purchase of property and equipment to increase our in-house production capacity, partially offset by $0.3 million proceeds from sale of certain equipment.

Net cash used in investing activities of $9.2 million for the fiscal year 2014 was primarily attributable to $9.4 million purchase of property and equipment to increase our in-house production capacity, partially offset by $0.2 million proceeds from sale of certain equipment.

Cash flows from financing activities

Net cash used in financing activities of $36.7 million for the fiscal year 2016 was primarily attributable to $42.1 million for repurchase of our common shares under the repurchase program, and $0.9 million in payment of capital lease obligations, and $1.0 million in common shares acquired to settle withholding tax related to vesting of restricted stock units, partially offset by a $7.4 million of proceeds from exercises of share options and issuance of shares under the ESPP.

Net cash used in financing activities of $18.0 million for the fiscal year 2015 was primarily attributable to $13.6 million of repayment to our borrowings, $5.8 million for repurchase of our common shares under the repurchase program, $0.5 million in common shares acquired to settle withholding tax related to vesting of restricted stock units, and $1.1 million in payment of capital lease obligations, partially offset by a $3.0 million of proceeds from exercises of share options and issuance of shares under the ESPP.

Net cash used in financing activities of $3.4 million for the fiscal year 2014 was primarily attributable to $3.6 million of repayment to our borrowings, $0.9 million for repurchase of our common shares under the repurchase program, $0.3 million in common shares acquired to settle withholding tax related to vesting of restricted stock units, and $1.3 million in payment of capital lease obligations, partially offset by a $2.7 million of proceeds from exercises of share options and issuance of shares under the ESPP.

Contractual Obligations

Our contractual obligations as of June 30, 2016 are as follows:

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	Payments Due by Period
			Less than						More than
	Total		1 year		1-3 years		3-5years		5 years
	(in thousands)
Capital leases	$	2,676	$	892	$	1,784	$	—	$	—
Operating leases	9,910		3,200		4,098		2,038		574
Capital commitments with respect to property and equipment	6,623		6,623		—		—		—
Purchase commitments with respect to inventories and research and development	39,637		39,637		—		—		—
Total contractual obligations	$	58,846	$	50,352	$	5,882	$	2,038	$	574

As of June 30, 2016, we had recorded liabilities of $1.3 million for uncertain tax positions and $0.3 million for potential interest and penalties, which are not included in the above table because we are unable to reliably estimate the amount of payments in individual years that would be made in connection with these uncertain tax positions.

Joint Venture Commitments

In March 2016, we executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

Off-Balance Sheet Arrangements

As of June 30, 2016, we had no material off-balance sheet arrangements as defined in Item 303(a)(4)(ii) of Regulation S-K.

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Critical Accounting Policies and Estimates

The preparation of our consolidated financial statements requires us to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, our consolidated financial statements will be affected. On an ongoing basis, we evaluate the estimates, judgments and assumptions including those related to revenue recognition, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property and equipment and for goodwill and intangible assets.

Revenue recognition

We recognize revenue when there is persuasive evidence that an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and when collectability is reasonably assured. We recognize revenue when product is shipped to the customer, net of estimated stock rotation returns and price adjustments to certain distributors.

We sell our products primarily to distributors, who in turn sell our products globally to various end customers. Our revenue is net of the effect of the estimated stock rotation returns and price adjustments that we expect to provide to certain distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of the products purchased by distributors during a specified period. We estimate provision for stock rotation returns based on historical returns and individual distributor agreements. We also provide special pricing to certain distributors primarily based on volume, to encourage resale of our products. We estimate the expected price adjustments at the time the revenue is recognized based on distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for our products. If actual stock rotation returns or price adjustments differ from our estimates, adjustments may be recorded in the period when such actual information is known. Allowance for price adjustments is recorded against accounts receivable and provision for stock rotation is recorded in accrued liabilities on the consolidated balance sheets.

Revenue from certain distributors is deferred until the distributor resells the products to end customers due to price protection adjustments and right of returns that cannot be reliably measured. The deferred revenue, net of the associated deferred cost of the inventory, is recorded as deferred margin on the consolidated balance sheets.

Packaging and testing services revenue is recognized upon shipment of serviced products to the customer.

Inventory reserves

We carry inventories at the lower of cost (determined on a first-in, first-out basis) or market value. Cost primarily consists of semiconductor wafers and raw materials, labor, depreciation expenses and other manufacturing expenses and overhead, and packaging and testing fees paid to third parties if subcontractors are used. Inventory reserves are made based on our periodic review of inventory quantities on hand as compared with our sales forecasts, historical usage, aging of inventories, production yield levels and current product selling prices. If actual market conditions are less favorable than those forecasted by us, additional future inventory write-downs may be required that could adversely affect our operating results. Inventory reserves once established are not reversed until the related inventory has been sold or scrapped. If actual market conditions are more favorable than expected and the products that have previously been written down are sold, our gross margin would be favorably impacted.

Product warranty

We provide a standard one-year warranty for the products we sell. We accrue for estimated warranty costs at the time revenue is recognized. Our warranty obligation is affected by product failure rates, labor and material costs for replacing defective parts, related freight costs for failed parts and other quality assurance costs. We monitor our product returns for warranty claims and maintain warranty reserve based on our historical experiences and anticipated warranty claims known at the time of estimation. If actual warranty costs differ significantly from our estimates, revisions to the estimated warranty accrual would be required and any such adjustments could be material.

Accounting for income taxes

We are subject to income taxes in a number of jurisdictions. We must make certain estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments occur in the calculation of tax credits, benefits and deductions, and in the calculation of certain tax assets and liabilities which arise from differences in the timing of recognition of revenue and expense for tax and financial statement purposes, as well as interest and penalties related to uncertain tax positions. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. We establish accruals for certain tax contingencies based on estimates of

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whether additional taxes may be due. While the final tax outcome of these matters may differ from the amounts that were initially recorded, such differences will impact the income tax and deferred tax provisions in the period in which such determination is made.  As a result, significant changes to these estimates may result in an increase or decrease to our tax provision in a subsequent period.

Significant management judgment is also required in determining whether deferred tax assets will be realized in full or in part. When it is more likely than not that all or some portion of specific deferred tax assets such as net operating losses or foreign tax credit carryforwards will not be realized, a valuation allowance must be established for the amount of the deferred tax assets that cannot be realized. We consider all available positive and negative evidence on a jurisdiction-by-jurisdiction basis when assessing whether it is more likely than not that deferred tax assets are recoverable. We consider evidence such as our past operating results, the existence of cumulative losses in recent years and our forecast of future taxable income. We intend to maintain a partial valuation allowance equal to the state research and development credit carryfowards until sufficient positive evidence exists to support reversal of the valuation allowance.

We have not provided for withholding taxes on the undistributed earnings of our foreign subsidiaries because we intend to reinvest such earnings indefinitely. As of June 30, 2016, the cumulative amount of undistributed earnings of our foreign subsidiaries considered permanently reinvested was $82.2 million. The determination of the unrecognized deferred tax liability on these earnings is not practicable. Should we decide to remit this income to the Bermuda parent company in a future period, our provision for income taxes may increase materially in that period.

The Financial Accounting Standards Board, or FASB, has issued guidance which clarifies the accounting for income taxes by prescribing a minimum probability threshold that a tax position must meet before a financial statement benefit is recognized. The minimum threshold is defined as a tax position that is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The tax benefit to be recognized is measured as the largest amount of benefit that is greater than fifty percent likely to be realized upon ultimate settlement. The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax law and regulations in a multitude of jurisdictions. Although the guidance on the accounting for uncertainty in income taxes prescribes the use of a recognition and measurement model, the determination of whether an uncertain tax position has met those thresholds will continue to require significant judgment by management. If the ultimate resolution of tax uncertainties is different from what is currently estimated, a material impact on income tax expense could result.

Our provision for income taxes is subject to volatility and could be adversely impacted by changes in earnings or tax laws and regulations in various jurisdictions. We are subject to the continuous examination of our income tax returns by the Internal Revenue Service and other tax authorities. We regularly assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. There can be no assurance that the outcomes from these continuous examinations will not have an adverse effect on our operating results and financial condition. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will impact the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the impact of changes to reserves, as well as the related net interest and penalties.

Share-based compensation expense

We recognize share-based compensation expense based on the estimated fair value of the awards determined by the Black-Scholes option valuation model, using the accelerated vesting attribution method. Share-based compensation expense is significant to the consolidated financial statements and is calculated using our best estimates, which involve inherent uncertainties and the application of management's judgment.

We determined the weighted average valuation assumptions as follows:

• Expected term is determined by using the historical data of industry peers as adjusted for expected changes in future exercise patterns. Starting July 2016, expected term will be estimated using the Company’s historical exercise behavior and expected future exercise behavior.

• Forfeiture rate is estimated based on the historical average period of time that the awards were outstanding and forfeited. The estimate of forfeitures is adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from the prior estimates. Changes in estimated forfeitures are recognized in the period of change and impact the amount of stock compensation expenses to be recognized in future periods, which could be material if actual results differ significantly from our estimates.

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• Volatility is estimated based on combining both the Company's historical volatility and the volatility of industry peers over a period equivalent to the expected term of the stock awards granted. Starting July 2016, the Company's publicly traded shares history will be solely used in estimating the volatility rate.

• Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the awards granted.

• Dividend yield is zero as the Company has never declared or paid any dividends and currently has no intention to pay dividends in the foreseeable future.

Estimated Useful Lives for Property, Plant and Equipment and Intangible Assets

Property, plant and equipment are recorded at cost and are depreciated using the straight-line method over estimated useful lives of the assets. Patents and exclusive technology rights purchased from third parties are amortized on a straight-line basis over their estimated useful lives of three to seven years. Trade name and customer relationships acquired in a business combination are recognized at fair values at the acquisition date and amortized on a straight-line basis over their estimated economic lives of three years and four years, respectively.

Goodwill

Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually, or whenever changes in circumstances indicate that the carrying amount of goodwill or intangible assets may not be recoverable. These tests are performed at the reporting unit level using a two-step, fair-value based approach. In testing for a potential impairment of goodwill, we first compare the carrying value of assets and liabilities to the estimated fair value. If estimated fair value is less than carrying value, then potential impairment exists. The amount of any impairment is then calculated by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value. The process of evaluating the potential impairment of goodwill requires significant judgment at many points during the analysis, including calculating fair value of each reporting unit based on estimated future cash flows and discount rates to be applied.

Recently Issued Accounting Pronouncements

See Note 1 of the Notes to the consolidated financial statements under Item 15 in this Annual Report on Form 10-K for a full description of recent accounting pronouncements, including the expected dates of adoption and estimated effects on results of operations and financial condition.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Foreign currency risk

We and our principal subsidiaries use U.S. dollars as our functional currency because most of the transactions are conducted and settled in U.S. dollars. All of our revenue and a significant portion of our operating expenses are denominated in U.S. dollars. The functional currency for our in-house packaging and testing facilities in China is U.S. dollars and a significant portion of our capital expenditures are denominated in U.S. dollars. However, foreign currencies are required to fund our overseas operations, primarily in Taiwan and China. Operating expenses of overseas operations are denominated in their respective local currencies. In order to minimize exposure to foreign currencies, we maintained cash and cash equivalent balances in foreign currencies, including Chinese Yuan (“RMB”) as operating funds for our foreign operating expenses. Our management believes that our exposure to foreign currency translation risk is not significant based on a 10% sensitivity analysis in foreign currencies due to the fact that the net assets denominated in foreign currencies pertaining to foreign operations, principally in Taiwan and China, are not significant to our consolidated net assets.

Commodity Price Risk

We are subject to risk from fluctuating market prices of certain commodity raw materials, particularly gold, that are used in our manufacturing process and incorporated into our end products. Supplies for such commodities may from time-to-time become restricted, or general market factors and conditions may affect the pricing of such commodities. Over the past few years, the price of gold increased significantly and certain of our supply chain partners assess surcharges to compensate for the rising commodity prices. We have been converting some of our products to use copper wires instead of gold wires. Our results of operations may be materially and adversely affected if we have difficulty obtaining these raw materials, the quality of available raw materials deteriorates, or there are significant price changes for these raw materials. For periods in which the prices of these raw materials are rising, we may be unable to pass on the increased cost to our customers which would result in decreased margins for the products in which they are used and could have a material adverse effect on our net earnings. We also may need to record losses for adverse purchase commitments for these materials in periods of declining prices. We do not enter into formal hedging arrangements to mitigate against commodity risk. We estimate that a 10% increase or decrease in the costs of raw materials subject to commodity price risk, such as gold, would decrease or increase our current year's net earnings by $0.7 million, assuming that such changes in our costs have no impact on the selling prices of our products and that we have no pending commitments to purchase metals at fixed prices.

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Item 8. Financial Statements and Supplementary Data

See Part IV, Item 15 "Exhibits and Financial Statement Schedules" for our consolidated financial statements and the notes and schedules thereto filed as part of this annual report.

Selected Quarterly Consolidated Financial Data

The following tables present our unaudited consolidated financial information for each of the eight quarters in the period ended June 30, 2016. Net income per share for the four quarters of each fiscal year may not sum to the total for the fiscal year because of difference in the number of shares outstanding during each period. The operating results for any quarter should not be relied upon as necessarily indicative of results for any future period. We expect our quarterly operating results to fluctuate in future periods due to a variety of reasons, including those discussed in Item 1A. “Risk Factors.”

	Quarter Ended
	June 30, 2016		March 31, 2016				December 31, 2015				September 30, 2015
	(in thousands, except per share data)
Revenue	$	91,410	$	82,987			$	79,825			$	81,439
Gross profit	$	19,470	$	16,319			$	14,972			$	15,061
Operating income (loss)	$	2,554	$	(171	)	(1)	$	(273	)	(1)	$	(600	)	(1)
Net income (loss)	$	1,921	$	(1,263	)		$	(1,611	)		$	(1,975	)
Net income (loss) per share
Basic	$	0.08	$	(0.06	)		$	(0.07	)		$	(0.09	)
Diluted	$	0.08	$	(0.06	)		$	(0.07	)		$	(0.09	)

	Quarter Ended
	June 30, 2015				March 31, 2015				December 31, 2014				September 30, 2014
	(in thousands, except per share data)
Revenue	$	81,472			$	76,918			$	81,328			$	88,217
Gross profit	$	14,316			$	12,764			$	15,242			$	18,160
Operating loss	$	(2,105	)	(1)	$	(3,521	)	(1)	$	(331	)	(1)	$	1,739	(1)
Net income (loss)	$	(2,925	)	(2)	$	(4,105	)	(2)	$	(1,297	)	(2)	$	564	(2)
Net income (loss) per share
Basic	$	(0.11	)	(2)	$	(0.16	)		$	(0.05	)		$	0.02
Diluted	$	(0.11	)	(2)	$	(0.16	)		$	(0.05	)		$	0.02

(1)    In this Annual Report on Form 10-K, certain prior year financial information has been reclassified. The Company reclassified realized and unrealized foreign currency gains and losses from operating income (loss) to interest income and other income (loss), net. The reclassification resulted in an increase in operating loss of $122,000, a decrease in operating loss of $325,000 and a decrease in operating loss of $162,000 for the quarter ended March 31, 2016, December 31, 2015 and September 30, 2015, respectively. The reclassification also resulted in an increase in operating loss of $261,000, $137,000, $8,000 and a decrease in operating income of $21,000 for the quarter ended June 30, 2015, March 31, 2015, December 31, 2014 and September 30, 2014, respectively.

(2)     In this Annual Report on Form 10-K, certain prior year financial information has been restated due to an accounting correction.  During the quarter ended March 31, 2016, the Company identified and recorded immaterial errors related to the fiscal years ended June 30, 2015, 2014 and 2013.  The immaterial errors resulted from overstatement of long-term deferred income tax liabilities and income tax expenses.  The overall impact of the errors on the Company's consolidated financial position and results of operations is not material and as such, previously filed Annual Reports on Form 10-K for the years affected by the errors have not been amended. The adjustments resulted in a decrease in net loss of $172,000 and a decrease in basic and diluted net loss per common share of $0.01 for the quarter ended June 30, 2015.

56

The following table present the effects of adjustments made to our previously reported consolidated quarterly financial information for the quarter ended June 30, 2015. For further information regarding these adjustment, see Note 1 of this Form 10-K.

	Quarter Ended June 30, 2015 (As previously reported)			Adjustment		Quarter Ended June 30, 2015 (As re-stated)
Revenue	$	81,472		$	—	$	81,472
Gross profit	$	14,316		$	—	$	14,316
Operating loss	$	(1,844	)	$	—	$	(2,105	)
Net income (loss)	$	(3,097	)	$	172	$	(2,925	)
Net income (loss) per share
Basic	$	(0.12	)	$	0.01	$	(0.11	)
Diluted	$	(0.12	)	$	0.01	$	(0.11	)

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Not applicable.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, (the “Exchange Act”)), as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of June 30, 2016 have been designed and are functioning effectively to provide reasonable assurance that the information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

Management's Annual Report on Internal Control over Financial Reporting

Our management, including our Chief Executive Officer and Chief Financial Officer, is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f) and Rule 15d-15(f). Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of our financial statements for external purposes in accordance with generally accepted accounting principles, and includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are made only in accordance with authorizations of our management and directors; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on our financial statements.

The effectiveness of the Company's internal control over financial reporting as of June 30, 2016 has been audited by Grant Thornton LLP, an independent registered public accounting firm, as stated in their report, included on the following page.

Limitation on the Effectiveness of Controls    

While our disclosure controls and procedures and internal control over financial reporting are designed to provide reasonable assurance that their respective objectives will be met, we do not expect that our disclosure controls and procedures or our internal control over financial reporting are or will be capable of preventing or detecting all errors and all fraud. Any control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system's objectives will be met.

57

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the quarter ended June 30, 2016 that have materially affected or are reasonably likely to materially affect, our internal control over financial reporting.

58

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Alpha and Omega Semiconductor Limited

We have audited the internal control over financial reporting of Alpha and Omega Semiconductor Limited (a Bermuda corporation) and subsidiaries (the “Company”) as of June 30, 2016, based on criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Alpha and Omega Semiconductor Limited and subsidiaries maintained, in all material respects, effective internal control over financial reporting as of June 30, 2016, based on criteria established in the 2013 Internal Control-Integrated Framework issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements of the Company as of and for the year ended June 30, 2016, and our report dated August 26, 2016 expressed an unqualified opinion on those consolidated financial statements and schedules.

/s/ GRANT THORNTON LLP

San Francisco, California

August 26, 2016

59

Item 9B. Other Information

None

60

PART III

Certain information required by Part III is omitted from this Annual Report on Form 10-K because we intend to file our definitive proxy statement for our next annual general meeting of shareholders, pursuant to Regulation 14A of the Securities Exchange Act of 1934, as amended (the “2016 Proxy Statement”), no later than 120 days after the end of fiscal year 2016, and certain information to be included in the 2016 Proxy Statement is incorporated herein by reference.

Item 10. Directors, Executive Officers and Corporate Governance

The information required by this item concerning our directors, executive officers, Section 16 compliance and corporate governance matters is contained in part under the caption "Business - Executive Officers" in Part I of this report, and the remainder is incorporated by reference to the information set forth in the sections titled “Election of Directors” and “Section 16(a) Beneficial Ownership Reporting Compliance” in the 2016 Proxy Statement.

Item 11. Executive Compensation

The information required by this item regarding executive compensation is incorporated by reference from the information set forth under the captions “Compensation of Non-Employee Directors” and “Executive Compensation,” in the 2016 Proxy Statement.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this item regarding security ownership of certain beneficial owners and management is incorporated by reference to the information set forth in the section titled “Security Ownership of Certain Beneficial Ownersand Management” and “Equity Compensation Plan Information” in the 2016 Proxy Statement.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this item regarding related party transactions and director independence is incorporated by reference from the information set forth under the captions “Board of Directors and Committees of the Board", and “Related Party Transactions" in the 2016 Proxy Statement.

Item 14. Principal Accounting Fees and Services

The information required by this item regarding principal accountant fees and services is incorporated by reference from the information set forth under the caption “Principal Accounting Fees and Services” in the 2016 Proxy Statement.

61

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) The following documents are filed as part of this annual report:

(1) Consolidated Financial Statements. The index to the consolidated financial statements is below.

Item	Page
Report of Independent Registered Public Accounting Firm	63
Consolidated Balance Sheets	64
Consolidated Statements of Operations	65
Consolidated Statements of Comprehensive Loss	66
Consolidated Statements of Equity	67
Consolidated Statements of Cash Flows	68
Notes to the Consolidated Financial Statements	70

(2) Financial Statement Schedules.

Schedule I - Condensed Financial Information of Registrant	96
Schedule II - Valuation and Qualifying accounts	101

(b) Exhibits

The exhibits listed on the accompanying Index to Exhibits in Item 15(b) below are filed as part of, or hereby incorporated by reference into, this Annual Report on Form 10-K.

62

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Alpha and Omega Semiconductor Limited

We have audited the accompanying consolidated balance sheets of Alpha and Omega Semiconductor Limited (a Bermuda corporation) and subsidiaries (the “Company”) as of June 30, 2016 and 2015, and the related consolidated statements of operations, comprehensive income (loss), equity, and cash flows for each of the three years in the period ended June 30, 2016. Our audits of the basic consolidated financial statements included the financial statement schedules listed in the index appearing under Item 15(a)(2). These financial statements and financial statement schedules are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Alpha and Omega Semiconductor Limited as of June 30, 2016 and 2015, and the results of their operations and their cash flows for each of the three years in the period ended June 30, 2016 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the related financial statement schedules, when considered in relation to the basic consolidated financial statements take as a whole, present fairly, in all material respects, the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of June 30, 2016, based on criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated August 26, 2016 expressed an opinion on the effectiveness of the Company’s internal controls over financial reporting.

/s/ GRANT THORNTON LLP

San Francisco, California

August 26, 2016

63

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED BALANCE SHEETS

(in thousands except par value per share)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	87,774		$	106,085
Restricted cash	188			368
Accounts receivable, net	26,594			38,781
Inventories	68,848			64,175
Other current assets	4,526			4,279
Total current assets	187,930			213,688
Property, plant and equipment, net	116,084			119,579
Deferred income tax assets - long term	12,132			12,340
Other long-term assets	2,359			2,297
Total assets	$	318,505		$	347,904
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	42,718		$	44,083
Accrued liabilities	22,590			19,225
Income taxes payable	2,356			1,372
Deferred margin	997			716
Capital leases	819			941
Total current liabilities	69,480			66,337
Income taxes payable - long term	1,577			1,601
Deferred income tax liabilities	2,973			2,310
Other long term liabilities	2,436			1,017
Total liabilities	76,466			71,265
Commitments and contingencies (Note 13)
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholders’ equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	318,505		$	347,904

The accompanying notes are an integral part of these consolidated financial statements.

64

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

	Year Ended June 30,
	2016			2015			2014
Revenue	$	335,661		$	327,935		$	318,121
Cost of goods sold	269,839			267,453			259,050
Gross profit	65,822			60,482			59,071
Operating expenses:
Research and development	26,006			27,075			24,409
Selling, general and administrative	37,874			37,625			34,554
Impairment of long-lived assets	432			—			—
Total operating expenses	64,312			64,700			58,963
Operating income (loss)	1,510			(4,218		)	108
Interest income and other income (loss), net	(498		)	533			(177		)
Interest expense	(23		)	(181		)	(266		)
Income (loss) before income taxes	989			(3,866		)	(335		)
Income tax expense	4,021			3,897			2,769
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)
Net loss per common share attributable to Alpha and Omega Semiconductor Limited
Basic	$	(0.13	)	$	(0.29	)	$	(0.12	)
Diluted	$	(0.13	)	$	(0.29	)	$	(0.12	)
Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net loss per share:
Basic	22,452			26,429			25,952
Diluted	22,452			26,429			25,952

The accompanying notes are an integral part of these consolidated financial statements.

65

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(in thousands)

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

The accompanying notes are an integral part of these consolidated financial statements.

66

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED STATEMENTS OF EQUITY

(in thousands)

	Convertible Preferred Shares			Common Shares				Treasury Stock					Additional Paid-In Capital			Accumulated Other Comprehensive Income			Retained Earnings			Total AOS Shareholders' Equity			Noncontrolling Interest			Total Equity
	Shares	Amount		Shares		Amount		Shares		Amount
Balance, June 30, 2013	—	$	—	25,882		$	51	(226	)	$	(2,054	)	$	168,352		$	957		$	114,294		$	281,600		$	—		$	281,600
Exercise of common stock options and release of RSUs	—	—		552		1		—		—			1,098			—			—			1,099			—			1,099
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	—	—		—		—		6		83			—			—			(83		)	—			—			—
Withholding tax on restricted stock units	—	—		(41	)	—		—		—			(316		)	—			—			(316		)	—			(316		)
Issuance of common shares under Employee Stock Purchase Plan	—	—		251		1		—		—			1,575			—			—			1,576			—			1,576
Repurchase of common shares under shares repurchase program	—	—		—		—		(120	)	(918		)	—			—			—			(918		)	—			(918		)
Share-based compensation expense	—	—		—		—		—		—			3,375			—			—			3,375			—			3,375
Net loss including noncontrolling interest	—	—		—		—		—		—			—			—			(3,104		)	(3,104		)	—			(3,104		)
Cumulative translation adjustment	—	—		—		—		—		—			—			76			—			76			—			76
Balance, June 30, 2014	—	—		26,644		53		(340	)	(2,889		)	174,084			1,033			111,107			283,388			—			283,388
Exercise of common stock options and release of RSUs	—	—		475		1		—		—			1,408			—			—			1,409			—			1,409
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	—	—		—		—		8		112			—			—			(112		)	—			—			—
Withholding tax on restricted stock units	—	—		(61	)	—		—		—			(539		)	—			—			(539		)	—			(539		)
Issuance of common shares under Employee Stock Purchase Plan	—	—		256		1		—		—			1,597			—			—			1,598			—			1,598
Repurchase of common shares under shares repurchase program	—	—		—		—		(666	)	(5,816		)	—			—			—			(5,816		)	—			(5,816		)
Share-based compensation expense	—	—		—		—		—		—			4,490			—			—			4,490			—			4,490
Net loss including noncontrolling interest	—	—		—		—		—		—			—			—			(7,763		)	(7,763		)	—			(7,763		)
Cumulative translation adjustment	—	—		—		—		—		—			—			(128		)	—			(128		)	—			(128		)
Balance, June 30, 2015	—	—		27,314		55		(998	)	(8,593		)	181,040			905			103,232			276,639			—			276,639
Exercise of common stock options and release of RSUs	—	—		926		1		—		—			5,329			—			—			5,330			—			5,330
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	—	—		—		—		42		475			—			—			(233		)	242			—			242
Withholding tax on restricted stock units	—	—		(93	)	—		—		—			(1,036		)	—			—			(1,036		)	—			(1,036		)
Issuance of common shares under Employee Stock Purchase Plan	—	—		258		1		—		—			1,798			—			—			1,799			—			1,799
Repurchase of common shares under shares repurchase program	—	—		—		—		(4,695	)	(42,081		)	—			—			—			(42,081		)	—			(42,081		)
Share-based compensation expense	—	—		—		—		—		—			4,313			—			—			4,313			—			4,313
Net loss including noncontrolling interest	—	—		—		—		—		—			—			—			(2,928		)	(2,928		)	(104		)	(3,032		)
Cumulative translation adjustment	—	—		—		—		—		—			—			(136		)	—			(136		)	1			(135		)
Balance, June 30, 2016	—	$	—	28,405		$	57	(5,651	)	$	(50,199	)	$	191,444		$	769		$	100,071		$	242,142		$	(103	)	$	242,039

The accompanying notes are an integral part of these consolidated financial statements.

67

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	27,303			27,547			27,876
Allowance for doubtful accounts	—			—			(363		)
Share-based compensation expense	4,313			4,490			3,375
Deferred income taxes, net	871			785			574
(Gain) loss on disposal of property and equipment	95			(103		)	(160		)
Impairment of long-lived assets	432			—			—
Government grant via forgiven loan	—			(250		)	—
Changes in assets and liabilities:
Accounts receivable	12,187			(2,247		)	2,126
Inventories	(4,674		)	2,386			1,779
Other current and long-term assets	(310		)	(517		)	(1,429		)
Accounts payable	(1,162		)	3,335			5,517
Income taxes payable	960			(1,276		)	(916		)
Accrued and other liabilities	3,199			1,282			2,685
Net cash provided by operating activities	40,182			27,669			37,960
Cash flows from investing activities
Purchase of property and equipment	(21,901		)	(21,492		)	(9,395		)
Proceeds from sale of property and equipment	—			272			244
(Increase) decrease in restricted cash	180			(125		)	(40		)
Net cash used in investing activities	(21,721		)	(21,345		)	(9,191		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,081		)	(5,816		)	(918		)
Repayments of borrowings	—			(13,571		)	(3,571		)
Principal payments on capital leases	(940		)	(1,061		)	(1,267		)
Net cash used in financing activities	(36,686		)	(17,980		)	(3,397		)
Effect of exchange rate changes on cash and cash equivalents	(86		)	(47		)	10
Net increase (decrease) in cash and cash equivalents	(18,311		)	(11,703		)	25,382
Cash and cash equivalents at beginning of year	106,085			117,788			92,406
Cash and cash equivalents at end of year	$	87,774		$	106,085		$	117,788

68

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended June 30,
	2016		2015		2014
Supplemental disclosures of cash flow information:
Cash paid for interest	$	9	$	171	$	304
Cash paid for income taxes	$	3,139	$	4,813	$	2,585
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	$	5,711	$	5,728	$	3,390
Property and equipment acquired under capital leases	$	2,449	$	—	$	1,921
Reissuance of Treasury Stock	$	233	$	112	$	83

The accompanying notes are an integral part of these consolidated financial statements.

69

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1. The Company and Significant Accounting Policies

The Company

Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”, "AOS", "we" or "us") design, develop and supply a broad range of power semiconductors. The Company's portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. The Company conducts its operations primarily in the United States of America (“USA”), Hong Kong, China, Taiwan, Korea and Japan.

Basis of Preparation

The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and a subsidiary in which it has a controlling interest after elimination of inter-company balances and transactions. The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP").

Reclassification

The Company has reclassified certain amounts previously reported in its financial statements to conform to the current presentation. These reclassifications did not have a material impact on our consolidated financial statements.

Correction of Errors

In this Annual Report on Form 10-K, certain prior year financial information has been restated due to an accounting correction.  During the quarter ended March 31, 2016, the Company identified and recorded immaterial errors related to the fiscal years ended June 30, 2015, 2014 and 2013.  The immaterial errors resulted from overstatement of long-term deferred income tax liabilities and income tax expenses.  The overall impact of the errors on the Company's consolidated financial position and results of operations is not material and as such, previously filed Annual Reports on Form 10-K for the years affected by the errors have not been amended.

The adjustments resulted in a decrease in net loss of $172,000, $204,000 and $149,000 for the years ended June 30, 2015, 2014 and 2013, respectively and a decrease in basic and diluted net loss per common share of $0.01 for the years ended June 30, 2015, 2014 and 2013. The impact to the consolidated balance sheets as of June 30, 2015, 2014 and 2013 was a decrease in deferred income tax liabilities of $525,000, $353,000 and $149,000, respectively and an increase in retained earnings by the same amounts.

Use of Estimates

The preparation of our consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Foreign Currency Transactions and Translation

Most of the Company's principal subsidiaries use U.S. dollars as their functional currency because their transactions are primarily conducted and settled in U.S. dollars. All of their revenues and a significant portion of their operating expenses are denominated in U.S. dollars. The functional currencies for the Company's in-house packaging and testing facilities in China are U.S. dollars, and a significant majority of their capital expenditures are denominated in U.S. dollars. Foreign currency transactions are translated into the functional currencies using the exchange rates prevailing at the dates of the transactions. Foreign exchange gains and losses, resulting from the settlement of such transactions and from the remeasurement of monetary

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assets and liabilities denominated in foreign currencies using exchange rates at balance sheet date and non-monetary assets and liabilities using historical exchange rates, are recognized in the consolidated statements of operations.

For the Company's subsidiaries which use the local currency as their functional currency, their results and financial position are translated into U.S. dollars using exchange rates at balance sheet dates for assets and liabilities and using average exchange rates for income and expenses items. The resulting translation differences are presented as a separate component of accumulated other comprehensive income (loss) and noncontrolling interest in the consolidated statements of equity.

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of cash on hand and short-term bank deposits with original maturities of three months or less. Cash equivalents are highly liquid investments with stated maturities of three months or less as of the dates of purchase. The carrying amounts reported for cash and cash equivalents are considered to approximate fair values based upon their short maturities.

Cash and cash equivalents are maintained with reputable major financial institutions. If, due to current economic conditions or other factors, one or more of the financial institutions with which the Company maintains deposits fails, the Company's cash and cash equivalents may be at risk. Deposits with these banks may exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.

Accounts Receivable

The allowance for doubtful accounts is based on assessment of the collectibility of accounts receivable from customers. The Company reviews the allowance by considering factors such as historical collection experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer's ability to pay. The Company writes off a receivable and charges against its recorded allowance when it has exhausted its collection efforts without success.

Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair Value of Financial Instruments

The fair value of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities. The carrying value of the company's debt is considered a reasonable estimate of fair value which is estimated by considering the current rates available to the Company for debt of the same remaining maturities, structure and terms of the debts.

Inventories

The Company carries inventories at the lower of cost (determined on a first-in, first-out basis) or market value. Cost includes semiconductor wafer and raw materials, labor, depreciation expenses and other manufacturing expenses and overhead, and packaging and testing fees paid to third parties if subcontractors are used. Inventory reserves are made based on the Company's periodic review of inventory quantities on hand as compared with its sales forecasts, historical usage, aging of inventories, production yield levels and current product selling prices. If actual market conditions are less favorable than those

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forecasted by management, additional future inventory write-downs may be required that could adversely affect the Company's operating results. Inventory reserves once established are not reversed until the related inventory has been sold or scrapped.

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. Historical cost includes expenditures that are directly attributable to the acquisition of the items and the costs incurred to make the assets ready for their intended use.

Depreciation is provided for on a straight-line basis over the estimated useful lives of the related assets as follows:

Building	20 years
Manufacturing machinery and equipment	3 to 10 years
Equipment and tooling	5 years
Computer equipment and software	3 to 5 years
Office furniture and equipment	5 years
Leasehold improvements	2 to 15 years based on shorter of expected economic useful life or the lease term

Equipment and construction in progress represent equipment received but necessary installation has not been fully performed or leasehold improvements have been started but not yet completed. Equipment and construction in progress are stated at cost and transferred to respective asset class when fully completed and ready for their intended use.

Internal-use software development costs are capitalized to the extent that the costs are directly associated with the development of identifiable and unique software products controlled by the Company that will probably generate economic benefits beyond one year. Costs incurred during the application development stage are required to be capitalized. The application development stage is characterized by software design and configuration activities, coding, testing and installation. Training costs and maintenance are expensed as incurred, while upgrades and enhancements are capitalized if it is probable that such expenditures will result in additional functionality. Costs included employee costs incurred and fees paid to outside consultants for the software development and implementation. Internal developed software is amortized over its estimated useful life of five years starting from the date when it is ready for its intended use.

Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are recognized as selling, general and administrative expenses in the consolidated statements of operations. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred.

Impairment of Long-Lived Assets

Long-lived assets or asset groups are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. Factors that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of assets may not be recoverable. Where such factors indicate potential impairment, the recoverability of an asset or asset group is assessed by determining if the carrying value of the asset or asset group exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the assets over the remaining economic life.  The impairment loss is measured based on the difference between the carrying amount and estimated fair value.

Goodwill

Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually, or whenever changes in circumstances indicate that the carrying amount of goodwill or intangible assets may not be recoverable. These tests are performed at the reporting unit level using a two-step, fair-value based approach. In testing for a potential impairment of goodwill, the Company first compares the carrying value of assets and liabilities to the estimated fair value. If estimated fair value is less than carrying value, then potential impairment exists. The amount of any impairment is then calculated by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value.

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The process of evaluating the potential impairment of goodwill requires significant judgment at many points during the analysis, including calculating fair value of each reporting unit based on estimated future cash flows and discount rates to be applied. The Company re-evaluates its intangible assets and goodwill for impairment during the fourth quarter of fiscal year. Goodwill is recorded in other long-term assets in the Company's consolidated balance sheets.

Intangible Assets

Intangible assets are stated at cost less accumulated amortization. Intangible assets include patents and exclusive technology rights, trade names and customer relationships. Intangible assets with finite lives are amortized on a straight-line basis over the estimated periods of benefit, as follows:

Patents and exclusive technology rights	3 to 7 years
Trade name	3 years
Customer relationships	4 years

The Company evaluates its finite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to future undiscounted net cash flows expected to be generated by the asset group. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount and fair value less costs to sell. Intangible assets are recorded in other long-term assets in the Company's consolidated balance sheets.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contribution from the Chongqing funds and contributions of cash, equipments and intangible assets from the Company. The Company owns 51% and the Chongqing funds owns 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has controlling financial interest.

Revenue Recognition

The Company recognizes revenue when there is persuasive evidence that an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and when collectability is reasonably assured. The Company recognizes revenue when product is shipped to the customer, net of estimated stock rotation returns and price adjustments that it expects to provide to certain distributors.

The Company sells its products primarily to distributors, who in turn sell the products globally to various end customers. The Company allows stock rotation returns from certain distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of products purchased by distributors during a specified period. The Company records an allowance for stock rotation returns based on historical returns and individual distributor agreements. The Company also provides special pricing to certain distributors, primarily based on volume, to encourage resale of the Company's products. The Company estimates the expected price adjustments at the time revenue is recognized based on distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for its products. If actual stock rotation returns or price adjustments differ from their estimates, adjustments are recorded in the period when the actual information is known. Allowance for price adjustments is recorded against accounts receivable and the provision for stock rotation rights is included in accrued liabilities on the consolidated balance sheets.

Revenue from certain distributors is deferred until the distributor resells the products to end customers due to price protection adjustments and right of returns that cannot be reliably measured. The deferred revenue, net of the associated deferred cost of the inventory, is recorded as deferred margin on the consolidated balance sheets.

Packaging and testing services revenue is recognized upon shipment of serviced products to the customer.

Product Warranty

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The Company provides a standard one-year warranty for the products it sells. The Company accrues for estimated warranty costs at the time revenue is recognized. The Company's warranty obligation is affected by product failure rates, labor and material costs for replacing defective parts, related freight costs for failed parts and other quality assurance costs. The Company monitors its product returns for warranty claims and maintains warranty reserves based on historical experiences and anticipated warranty claims known at the time of estimation.

Shipping and Handling Costs

Shipping and handling costs are included in cost of goods sold.

Research and Development

Research and development costs are expensed as incurred.

Provision for Income Taxes

Income tax expense or benefit is based on income or loss before taxes. Deferred tax assets and liabilities are recognized principally for the expected tax consequences of temporary differences between the tax basis of assets and liabilities and their reported amounts.

The Company is subject to income taxes in a number of jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. The Company establishes accruals for certain tax contingencies based on estimates of whether additional taxes may be due. While the final tax outcome of these matters may differ from the amounts that were initially recorded, such differences will impact the income tax and deferred tax provisions in the period in which such determination is made.

Significant management judgment is also required in determining whether deferred tax assets will be realized in full or in part. When it is more likely than not that all or some portion of specific deferred tax assets such as net operating losses or research and experimentation tax credit carryforwards will not be realized, a valuation allowance must be established for the amount of the deferred tax assets that cannot be realized. We consider all available positive and negative evidence on a jurisdiction-by-jurisdiction basis when assessing whether it is more likely than not that deferred tax assets are recoverable. We consider evidence such as our past operating results, the existence of cumulative losses in recent years and our forecast of future taxable income.

The Financial Accounting Standards Board, or FASB, issued guidance which clarifies the accounting for income taxes by prescribing a minimum probability threshold that a tax position must meet before a financial statement benefit is recognized. The minimum threshold is defined as a tax position that is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The tax benefit to be recognized is measured as the largest amount of benefit that is greater than fifty percent likely to be realized upon ultimate settlement. Although the guidance on the accounting for uncertainty in income taxes prescribes the use of a recognition and measurement model, the determination of whether an uncertain tax position has met those thresholds will continue to require significant judgment by management. If the ultimate resolution of tax uncertainties is different from what is currently estimated, a material impact on income tax expense could result.

Our provision for income taxes is subject to volatility and could be adversely impacted by changes in earnings or tax laws and regulations in various jurisdictions. We are subject to the continuous examination of our income tax returns by the Internal Revenue Service and other tax authorities. We regularly assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. To the extent that the final tax outcome of these matters is different from the amounts recorded, such differences will impact the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the impact of changes to reserves, as well as the related net interest and penalties.

Share-based Compensation Expense

The Company recognizes expense related to share-based compensation awards that are ultimately expected to vest based on estimated fair values on the date of grant using the Black-Scholes option valuation model. Share-based compensation expense is recognized on the accelerated vesting attribution basis over the requisite service period of the award, which generally equals the vesting period.

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The Company maintains an equity-settled, share-based compensation plan which grants share options and restricted share units (the "RSUs") to employees, directors and consultants. In May 2010, the Company adopted the Employee Share Purchase Plan (the "ESPP"). The fair value of RSUs is based on the fair value of the Company's common share on the date of grant. The fair values of stock options and common stock issued under the ESPP are determined at the date of grant using the Black-Scholes option valuation model.

The Company determined the weighted average valuation assumptions as follows:

• Expected term is determined by using the historical data of industry peers as adjusted for expected changes in future exercise patterns. Starting July 2016, expected term will be estimated using the Company’s historical exercise behavior and expected future exercise behavior.

• Forfeiture rate is estimated based on the historical average period of time that the awards were outstanding and forfeited. The estimate of forfeitures is adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from the prior estimates. Changes in estimated forfeitures are recognized in the period of change and impact the amount of stock compensation expenses to be recognized in future periods, which could be material if actual results differ significantly from our estimates.

• Volatility is estimated based on combining both the Company's historical volatility and the volatility of industry peers over a period equivalent to the expected term of the stock awards granted. Starting July 2016, the Company's publicly traded shares history will be solely used in estimating the volatility rate.

• Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the awards granted.

• Dividend yield is zero as the Company has never declared or paid any dividends and currently has no intention to pay dividends in the foreseeable future.

Advertising

Advertising expenditures are expensed as incurred. Advertising expense was $0.4 million, $0.5 million, and $0.3 million for the fiscal years ended June 30, 2016, 2015, and 2014, respectively.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments.

Leases

Leases entered into by the Company as a lessee are classified as capital or operating leases. Leases that transfer to the Company substantially the entire risks and benefits incidental to ownership are classified as capital leases. At the inception of a capital lease, an asset and an obligation are recorded at an amount equal to the lesser of the present value of the minimum lease payments and the asset’s fair market value at the beginning of each lease. Rental payments under operating leases are expensed as incurred.

Risks and Uncertainties

The Company is subject to certain risks and uncertainties. The Company believes changes in any of the following areas could have a material adverse effect on the Company's future financial position or results of operations or cash flows: new product development, including market receptiveness, operation of in-house manufacturing facilities, litigation or claims against the Company based on intellectual property, patent, product regulatory or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees, the ability to successfully operate joint venture and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures and cyclical market patterns. The Company's financial results are affected by a wide variety of factors, including general economic conditions specific to the semiconductor industry and the Company's particular market, such as the personal computing (PC) markets, the timely implementation of new products, new manufacturing process technology and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically

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been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in operating results due to the factors mentioned above or other factors.

The Company transitioned from a fabless to a “fab-lite” business model by completing the acquisition of the Oregon fab on January 31, 2012. Under this model, the Company allocates its wafer manufacturing requirements to both in-house capacity and selected third-party foundries. The Company also deploys and implements its proprietary power discrete processes and equipment at third-party foundries to maximize the performance and quality of its products.

The Company's revenue may be impacted by its ability to obtain adequate wafer supplies from third-party foundries and utilize wafer production and packaging and testing capacity from its in-house facilities. Currently the Company's main third-party foundry is Shanghai Hua Hong Grace Electronic Company Limited, or HHGrace, located in Shanghai, China. HHGrace has been manufacturing wafers for the Company since 2002. HHGrace manufactured ­25.0% and 25.0% of the wafers used in the Company's products for the fiscal year ended June 30, 2016 and 2015, respectively. Although the Company believes that its volume of production allows the Company to secure favorable pricing and priority in allocation of capacity in its third-party foundries, if the foundries' capacities are constrained due to market demands, HHGrace, together with other foundries from which the Company purchases wafers, may not be willing or able to satisfy all of the Company's manufacturing requirements on a timely basis and/or at favorable prices. The Company is also subject to the risks of service disruptions and raw material shortages by its foundries. Such disruptions, shortages and price increases could harm the Company's operating results. In addition, manufacturing facilities' capacity affects the Company's gross margin because the Company has certain fixed costs associated with its Oregon fab and in-house packaging and testing facilities. If the Company fails to utilize its manufacturing facilities' capacity at a desirable level, its financial condition and results of operations will be adversely effected.

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Recent Accounting Pronouncements

In May 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-12, "Revenue from Contracts with Customers (Topic 606) - Narrow-Scope Improvements and Practical Expedients." ASU 2016-12 provides additional guidance established by the FASB-IASB Joint Transition Resource Group for Revenue Recognition regarding the implementation of certain aspects of the new revenue recognition guidance. More specifically, the amendment provides additional guidance regarding assessing the collectibility criterion, the presentation of sales taxes and other similar taxes collected from customers, noncash consideration, contract modifications or completed contracts at transition of the new revenue recognition guidance and technical corrections. The effective date is consistent with the effective date of ASU 2014-09. The Company is currently evaluating the impact the adoption of ASU 2016-12 will have on its consolidated financial statements.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"). ASU 2016-10 clarify two aspects of Topic 606: (a) identifying performance obligations; and (b) the licensing implementation guidance. The update is effective for annual periods beginning after December 15, 2017 including interim reporting periods therein. The Company is currently evaluating the impact the adoption of ASU 2016-10 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of related amounts within the statement of cash flows. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2016, the FASB issued No. 2016-02, Leases ("ASU 2016-02"). This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In July 2015, the FASB issued No. 2015-11, Inventory - Simplifying the Measurement of Inventory ("ASU 2015-11"). ASU 2015-11 is additional guidance regarding the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value. This guidance is effective for fiscal years and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In April 2015, the FASB issued ASU No. 2015-03, Interest -Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts and the accounting for debt issue costs under IFRS. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. ASU 2015-03 is effective for the annual period beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments in this Update is permitted for financial statements that have not been previously issued. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2015, the FASB issued ASU No. 2015-2, “Consolidation (Topic 820): Amendments to the Consolidation Analysis.” ASU 2015-2 provides a revised consolidation model for all reporting entities to use in evaluating whether they should consolidate certain legal entities. All legal entities will be subject to reevaluation under this revised consolidation model. The revised consolidation model, among other things, (i) modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities, (ii) eliminates the presumption that a general partner should consolidate a limited partnership, and (iii) modifies the consolidation analysis of reporting entities that are involved with VIEs through fee arrangements and related party relationships. ASU 2015-2 is effective for fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

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In August 2014, the FASB issued amended standards No. 2014-15, Presentation of Financial Statements - Going Concern ("ASU 2014-15"), to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures requirement. The amendments (1) provide a definition of the term substantial doubt, (2) require an evaluation for each annual and interim reporting period, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is not alleviated, and (6) require an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. In August 2015, the FASB issued an accounting standard update for a one-year deferral of the effective date of ASU 2014-09 to annual and interim periods beginning after December 15, 2017 and permits entities to early adopt the standard of ASU 2014-09 for annual and interim reporting periods beginning after December 15, 2016. Companies are permitted to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

Impact of Recent Accounting Pronouncements Adoption

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which eliminates the requirement for companies to present deferred tax liabilities and assets as current and non-current in a classified balance sheet. Instead, upon adoption, companies are required to classify all deferred tax assets and liabilities as non-current. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 and has made the necessary conforming reclassifications to the accompanying June 30, 2016 consolidated balance sheet and related footnote disclosures. The application of the provisions of ASU 2015-17 resulted in a $2.2 million reduction in current deferred tax assets, a $1.5 million increase in long-term deferred income tax assets and a $0.7 million reduction in non-current deferred income tax liabilities at June 30, 2015.

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2. Net Income (loss) Per Common Share Attributable to Alpha and Omega Semiconductor Limited

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding, plus potential shares of common stock during the period. Potential shares of common stock include dilutive shares attributable to the assumed exercise of share options, ESPP shares and vesting of RSUs using the treasury stock method and contingent issuances of common shares related to convertible preferred shares, if dilutive. Under the treasury stock method, potential common shares outstanding are not included in the computation of diluted net income per share if their effect is anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share attributable to common shareholders:

	Year Ended June 30,
	2016			2015			2014
	(in thousands, except per share data)
Numerator:
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)
Denominator:
Basic:
Weighted average number of common shares used to compute basic net loss per share	22,452			26,429			25,952
Diluted:
Weighted average number of common shares used to compute diluted net loss per share	22,452			26,429			25,952
Net loss per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	(0.13	)	$	(0.29	)	$	(0.12	)
Diluted	$	(0.13	)	$	(0.29	)	$	(0.12	)

The following potential dilutive securities were excluded from the computation of diluted net loss per share as their effect would have been anti-dilutive:

	Year Ended June 30,
	2016	2015	2014
	(in thousands)
Employee stock options and RSUs	3,206	3,737	3,940
ESPP	414	380	601
Total potential dilutive securities	3,620	4,117	4,541

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3. Concentration of Credit Risk and Significant Customers

The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers.

Credit sales, which are mainly on credit terms of 30 to 60 days, are only made to customers who meet the Company's credit standards, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its financial assets to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant bad debt write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, where available.

Summarized below are individual customers whose revenue or accounts receivable balances were 10% or higher than the respective total consolidated amounts:

	Year Ended June 30,
Percentage of revenue	2016		2015		2014
Customer A	23.8	%	25.4	%	21.6	%
Customer B	37.2	%	36.1	%	43.1	%
Customer C	12.3	%	11.7	%	11.6	%

	June 30,
Percentage of accounts receivable	2016		2015
Customer A	21.3	%	29.4	%
Customer B	16.7	%	27.7	%
Customer C	27.2	%	14.7	%

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4. Balance Sheet Components

Accounts receivable

	June 30,
	2016			2015
	(in thousands)
Accounts receivable	$	43,324		$	58,249
Less: Allowance for price adjustments	(16,700		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	26,594		$	38,781

Inventories

	June 30,
	2016		2015
	(in thousands)
Raw materials	$	23,982	$	19,423
Work in-process	32,446		31,269
Finished goods	12,420		13,483
	$	68,848	$	64,175

Property, plant and equipment, net

	June 30,
	2016			2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,323			4,243
Manufacturing machinery and equipment	193,164			172,467
Equipment and tooling	12,289			11,261
Computer equipment and software	23,448			20,602
Office furniture and equipment	1,822			1,762
Leasehold improvements	28,660			27,568
	268,583			242,780
Less accumulated depreciation	(168,687		)	(141,883		)
	99,896			100,897
Equipment and construction in progress	16,188			18,682
Property, plant and equipment, net	$	116,084		$	119,579

Total depreciation expense was $27.3 million, $27.4 million and $27.5 million for fiscal year 2016, 2015 and 2014, respectively.

The gross amount of computer software recorded under capital leases was $8.3 million and $5.8 million and the related accumulated depreciation was $5.6 million and $4.5 million, respectively, at June 30, 2016 and 2015.

The Company capitalized $0.2 million, $1.0 million and $1.1 million of software development costs for fiscal year 2016, 2015 and 2014, respectively. Amortization of capitalized software development costs was $0.6 million, $0.5 million and $0.4 million for fiscal year 2016, 2015 and 2014, respectively. Unamortized capitalized software development costs at June 30, 2016 and 2015 were $1.4 million and $1.8 million, respectively.

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Impairment of long-lived assets, intangible assets, and goodwill

The Company re-evaluates its long-lived assets, intangible assets and goodwill for impairment during the fourth quarter of every fiscal year. During the fiscal year of 2016, the Company identified certain manufacturing equipments purchased for projects that were subsequently canceled. Because the equipments had no alternative uses, the Company recorded an asset impairment expense of approximately of $0.4 million related to these equipments. There was no impairment of long-lived assets for the fiscal year of 2015 and 2014. Also there was no indication of intangible assets and goodwill impairment for the fiscal year of 2016, 2015 and 2014.

Other long-term assets

	June 30,
	2016		2015
	(in thousands)
Prepayments for property and equipment	$	548	$	692
Investment in a privately held company	100		100
Office leases deposits	1,427		1,215
Other	—		4
Intangible assets	15		17
Goodwill	269		269
	$	2,359	$	2,297

Intangible assets

	June 30,
	2016			2015
	(in thousands)
Patents and exclusive technology rights	$	1,248		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	2,666			2,666
Less accumulated amortization	(2,651		)	(2,649		)
Intangible assets, net	$	15		$	17

Amortization expense for intangible assets was $2,000, $0.1 million and $0.4 million for the years ended June 30, 2016, 2015 and 2014, respectively.

Future minimum amortization expense of intangible assets is as follows (in thousand):

Year ending June 30,
2017	$	2
2018	2
2019	2
2020	2
2021	2
Thereafter	5
	$	15

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Goodwill

The changes in the carrying value of goodwill is as follows (in thousands):

	(in thousands)
Balance at June 30, 2014	$	269
Addition:	—
Balance at June 30, 2015	269
Addition:	—
Balance at June 30, 2016	$	269

Accrued liabilities

	June 30,
	2016		2015
	(in thousands)
Accrued compensation and benefits	$	10,211	$	8,582
Warranty accrual	1,495		1,957
Stock rotation accrual	1,988		1,894
Accrued professional fees	1,867		1,402
Accrued inventory	918		697
Accrued facilities related expenses	1,544		1,367
Other accrued expenses	4,567		3,326
	$	22,590	$	19,225

The activity in the warranty accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346		$	1,428
Addition	881			2,395			1,267
Utilization	(1,343		)	(1,784		)	(1,349		)
Ending balance	$	1,495		$	1,957		$	1,346

The activity in the stock rotation accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645		$	1,572
Addition	6,578			5,781			5,006
Utilization	(6,484		)	(5,532		)	(4,933		)
Ending balance	$	1,988		$	1,894		$	1,645

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Deferred margin

Deferred margin consists of the following:

	June 30,
	2016			2015
	(in thousands)
Deferred revenue	$	1,494		$	1,104
Deferred costs	(497		)	(388		)
Deferred margin	$	997		$	716

Capital leases

Long-term capital leases were included in the other long term liabilities in the consolidated balance sheets. Capital lease liabilities as of June 30, 2016 and 2015 consisted of the following:

	June 30,
	2016			2015
	(in thousands)
Computer software	$	2,449		$	923
Exclusive technology rights	65			82
	2,514			1,005
Less current portion	(819		)	(941		)
Capital leases - long-term portion	$	1,695		$	64

The computer software and exclusive technology rights under capital leases were included in property, plant and equipment and intangible assets, respectively.

Future minimum lease payments at June 30, 2016 are as follows (in thousand):

Year ending June 30,
2017	$	892
2018	892
2019	892
Total minimum lease payments	2,676
Less amount representing interest	(162		)
Total capital lease liabilities	$	2,514

5. Debt

On May 11, 2012, the Company entered into a loan agreement with a financial institution that provided a term loan of $20.0 million for general purposes and a $10.0 million non-revolving credit line for the purchase of equipment. Both the term loan and equipment credit line were fully repayable in May 2015. The borrowings could have been made in the form of either Eurodollar loans or Base Rate loans. Eurodollar loans accrued interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the agreement, plus a margin of 1.00% to 1.75%. Base Rate loans accrued interest at the highest of (a) the lender's Prime Rate, (b) the Federal Funds Rate plus 0.5% and (c) the Eurodollar Rate (for a one-month interest period) plus 1%; plus a margin of -0.5% to 0.25%. The applicable margins for both Eurodollar loans and Base Rate loans varied from time to time in the foregoing ranges based on the cash and cash equivalent balances maintained by the Company and its subsidiaries with the lender. In May 2013, the equipment credit line expired and there was no outstanding balance. In May 2015, the Company repaid the term loan in full.

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During July 2012, the Company entered into a loan agreement with the State of Oregon for an amount of $0.3 million. The loan was required to be used for training new and re-training existing employees of the Oregon fab. The loan bore a compound annual interest rate of 5.0% and was to be repaid in April 2014 if the required conditions were not met. In September 2014, the State of Oregon forgave the outstanding balance in full as the Company had satisfied the conditions. The $0.3 million loan forgiven was recorded as a reduction of costs of goods sold in our condensed consolidated statements of operations.

6. Joint Venture

On March 29, 2016, the Company entered into a joint venture contract (the “JV Agreement”) with two investment funds affiliated with the municipalities of Chongqing (the “Chongqing Funds”), pursuant to which the Company and Chongqing Funds form a joint venture, (the “JV Company”), for the purpose of constructing a power semiconductor packaging, testing and 12-inch wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which includes cash contribution from the Chongqing funds and contributions of cash, equipments and intangible assets from the Company.  The Initial Capitalization will be completed in stages commencing on the incorporation of the JV Company.  The Company owns 51%, and the Chongqing Funds owns 49%, of the equity interest in the JV Company. The Company expects the JV company to commence its initial production in the first half of fiscal 2018.

The Company began consolidating the expenses of the JV Company during the quarter ended June 30, 2016. The Company and the Chongqing Funds did not make any capital contributions to the JV Company as of June 30, 2016. Within one year from June 30, 2016, the Company is expected to contribute certain intangible assets, a portion of the packaging equipments currently being used in the Company's Shanghai facility, and cash of $10.0 million pursuant to the terms of the JV agreement. In July 2016, the Chongqing Funds contributed $33.0 million initial capital to the JV Company.

7. Shareholders' Equity

Common Shares

The Company's bye-laws, as amended, authorized the Company to issue 50,000,000 common shares with par value of $0.002. Each common share is entitled to one vote. The holders of common shares are also entitled to receive dividends whenever funds are legally available and when and if declared by the board of directors, subject to the prior rights of holders of all classes of shares outstanding. No dividends had been declared as of June 30, 2016.

On October 22, 2010, the Company's board of directors authorized a $25.0 million share repurchase program. Under this repurchase program the Company was authorized to repurchase shares from the open market or in privately negotiated transactions, from time to time, subject to supervision and oversight by the board. The Company accounts for treasury stock under the cost method. Shares repurchased are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. From time to time, treasury shares may be reissued as part of the Company's stock-based compensation programs. Gains on re-issuance of treasury stock are credited to additional paid-in capital; losses are charged to additional paid-in capital to offset the net gains, if any, from previous sales or re-issuance of treasury stock. Any remaining balance of the losses are charged to retained earnings. On May 8, 2014, the Company's Board of Directors approved to reactivate the share repurchase program with a remaining balance of $22.7 million. In April 2015, the Board of Directors approved an increase in the remaining available amount under the Company’s share repurchase program from approximately $17.8 million to $50.0 million.

In June 2015, the Company commenced a modified Dutch auction tender offer (the "Tender Offer") to repurchase an aggregate of $30.0 million of its outstanding common shares with a price range between $8.50 and $9.20 per share. In July 2015, the Company completed the Tender Offer in which it purchased 3,296,703 shares of its common shares, at a purchase price of $9.10 per share, for an aggregate purchase price of $30.0 million, excluding fees and expenses relating to the Tender Offer. These shares represent approximately 12.53% of the total number of the Company's common shares issued and outstanding as of June 30, 2015. The Tender Offer was part of the $50.0 million share repurchase program approved by the Board in April 15, 2015. Immediately following the completion of the Tender Offer, approximately $18.2 million remained available under the share repurchase program.

During fiscal years 2016, 2015 and 2014, the Company repurchased an aggregate of 4,695,499 shares, 666,230 shares and 119,594 shares, respectively, from the open market for a total cost of approximately $41.8 million, $5.8 million and $0.9 million, excluding fees and related expenses, at an average price of $8.90, $8.70 and $7.66 per share, respectively.

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As of June 30, 2016, the Company had repurchased an aggregate of 5,723,093 shares for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses, since inception of the program. No repurchased shares have been retired. Of the 5,723,093 repurchased shares, 71,803 shares with a weighted average repurchase price of $12.33 per share, were reissued at an average price of $4.28 per share for option exercises and vested restricted stock units ("RSU"). As of June 30, 2016, $6.4 million remain available under the share repurchase program.

Convertible Preferred Shares

On May 4, 2010, concurrent with the closing of the Company's initial public offering, all of the Company's outstanding preferred shares including 5,050,000 Series A convertible preferred shares, 2,488,094 Series B convertible preferred shares and 3,174,000 Series C convertible preferred shares, were automatically converted into 10,712,094 shares of common shares and the then-existing classes of preferred stock ceased to exist. At June 30, 2016 and 2015, the Company had no preferred shares outstanding and had 10,000,000 authorized undesignated preferred shares.

8. Share-based Compensation

2000 Share Plan

The 2000 Share Plan (the “2000 Plan”), as amended, authorized the board of directors to grant incentive share options and non-statutory share options to employees, directors and consultants of the Company and its subsidiaries for up to 5,425,000 common shares. Under the 2000 Plan, incentive share options and non-statutory share options were to be granted at a price that was not less than 100% and 85% of the fair value of the common share at the date of grant for employees and consultants, respectively. Options generally vest over a five-year period, 20% on the first anniversary from the grant date and ratably each month over the remaining 48-month period, and are exercisable for a maximum period of ten years after the date of grant. Incentive share options granted to shareholders who own more than 10% of the outstanding shares of all classes of shares of the Company at the time of grant must be issued at an exercise price not less than 110% of the fair value of the common shares on the date of grant. In connection with the adoption of the 2009 Share Option/Share Issuance Plan on September 18, 2009, the 2000 Share Plan was terminated and no further awards were granted under the 2000 Share Plan.

2009 Share Option/Share Issuance Plan

The 2009 Share Option/Share Issuance Plan (the “2009 Plan”), as approved in September 2009 at the annual general meeting of shareholders, and as amended and restated in connection with the Company's IPO, authorized the board of directors to grant incentive share options, non-statutory share options and restricted shares to employees, directors, and consultants of the Company and its subsidiaries for up to 1,250,000 common shares. The number of common shares available for issuance under the 2009 Plan shall automatically increase in January each calendar year during the term of the 2009 Plan, beginning with calendar year 2011, by the lesser of 3% of the total number of common shares outstanding or 750,000 shares. This increase was 668,915 shares, 750,000 shares and 750,000 shares for the years ended June 30, 2016, 2015 and 2014, respectively. As of June 30, 2016, 2,527,000 shares were available for grant under the 2009 Plan.

The 2009 Plan is divided into three incentive compensation programs: Discretionary Grant Program, Share Issuance Program and Automatic Grant Program. Under the Discretionary Grant Program, eligible individuals may be granted options to purchase common shares and share appreciation rights tied to the value of the Company's common shares. Under the Share Issuance Program, eligible individuals may be issued common shares pursuant to restricted share awards, restricted share units, performance shares or other share-based awards which vest upon the attainment of pre-established performance milestones or the completion of a designated service period. Under the Automatic Grant Program, eligible non-employee board members will automatically receive options to purchase common shares at designated intervals over their period of continued board service. Each non-employee board members was granted an option to purchase 7,500 common shares on April 28, 2010 with exercise price equal to the IPO price. On the date of each annual shareholders meeting beginning in 2010 and ending in 2013, each individual who commence service as a non-employee board member by reason of his or her election to the board at such meeting and each individual who continues to serve as a non-employee board member was automatically granted an option to purchase 7,500 common shares. Beginning with the 2014 Annual Shareholders Meeting, on the date of each annual shareholders meeting, each individual who commences service as a non-employee Board member by reason of his or her election to the Board at such annual meeting and each individual who is to continue to serve as a non-employee Board member, whether or not that individual is standing for re-election to the Board at that particular annual meeting, will automatically be granted an award in the form of restricted share units ("RSU") covering that number of common shares determined by dividing forty-two thousand dollars ($42,000) by the average fair market value per share for the ninety (90)-day period preceding the grant date (the “Annual RSU Grant”).

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Under the 2009 Plan, incentive share options and RSU are to be granted at a price that is not less than 100% and nonstatutory share options are to be granted not less than 85% of the fair value of the common shares, at the date of grant for employees and consultants. Options and RSUs generally vest over a four-year to five-year period, and are exercisable for a maximum period of ten years after the date of grant. Incentive share options granted to shareholders who own more than 10% of the outstanding shares of all classes of shares of the Company at the time of grant must be issued at an exercise price not less than 110% of the fair value of the common shares on the date of grant.

A summary of the stock option activities under the 2000 Plan and 2009 Plan is as follows:

					Weighted		Weighted
			Weighted		Average		Average
			Average		Grant Date		Remaining
	Number of		Exercise Price		Fair Value		Contractual	Aggregate
	Shares		Per Share		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2013	3,593,854		$	10.24			5.46
Granted	764,375		$	7.49	$	3.85
Exercised	(421,456	)	$	2.60				$	2,222,155
Canceled or forfeited	(697,989	)	$	11.65
Outstanding at June 30, 2014	3,238,784		$	10.28			5.79
Granted	10,000		$	9.07	$	4.42
Exercised	(269,861	)	$	5.22				$	1,088,061
Canceled or forfeited	(142,706	)	$	10.08
Outstanding at June 30, 2015	2,836,217		$	10.77			4.64
Granted	—		$	—	$	—
Exercised	(666,445	)	$	8.36				$	1,746,173
Canceled or forfeited	(310,512	)	$	12.34
Outstanding at June 30, 2016	1,859,260		$	11.37			4.71	$	5,959,720
Options vested and expected to vest	1,840,261		$	11.41			4.68	$	5,839,323
Exercisable at June 30, 2016	1,595,992		$	12.00			4.22	$	4,296,568

The aggregate intrinsic value for options outstanding at June 30, 2016 in the table above is based on the Company’s common stock closing price on June 30, 2016.

Information with respect to stock options outstanding and exercisable as of June 30, 2016 is as follows:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-Average Remaining Contractual Life  (Years)	Weighted-Average Exercise Price		Number Exercisable	Weighted-Average Exercise Price
$7.21 - $7.21	6,875	7.58	$	7.21	6,875	$	7.21
$7.44 - $7.44	436,147	7.71	$	7.44	226,146	$	7.44
$7.47 - $9.90	399,788	5.71	$	8.84	346,521	$	8.92
$10.22 - $13.00	646,450	2.55	$	12.31	646,450	$	12.31
$14.14 - $18.00	370,000	3.81	$	17.20	370,000	$	17.20
$7.21 - $18.00	1,859,260	4.71	$	11.37	1,595,992	$	12.00

The Company did not grant any stock options during the year ended June 30, 2016. The fair value of stock options granted during the years ended June 30, 2015 and 2014 were estimated at the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions:

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	Year Ended June 30,
	2016	2015	2014
Volatility rate	—%	40.9% - 43.5%	46.9% - 49.2%
Risk-free interest rate	—%	1.6% - 1.8%	1.0% - 1.7%
Expected option life	—	5.5 years	5.5 years
Dividend yield	—%	—%	—%

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share			Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2013	549,553			$	9.50	1.87	$	4,198,585
Granted	368,554			$	7.54
Vested	(136,581	)		$	9.46
Forfeited	(125,152	)		$	9.54
Nonvested at June 30, 2014	656,374			$	8.40	1.77	$	6,084,587
Granted	493,622			$	8.92
Vested	(213,180	)		$	8.65
Forfeited	(62,870	)		$	8.35
Nonvested at June 30, 2015	873,946			$	8.64	1.77	$	7,638,288
Granted	466,255			$	11.28
Vested	(301,695	)		$	10.97
Forfeited	(105,443	)		$	8.85
Nonvested at June 30, 2016	933,063			$	9.18	1.73	$	12,997,568

Employee Share Purchase Plan

The Employee Share Purchase Plan (“Purchase Plan” or “ESPP”) was established in May 2010 upon the completion of the Company's IPO. The Purchase Plan provided for a series of overlapping offering periods with a duration of 24 months, with new offering periods, generally beginning on May 15 and November 15 of each year. The Purchase Plan allows employees to purchase common shares through payroll deductions of up to 15% of their eligible compensation. Such deductions will accumulate over a six-month accumulation period without interest. After such accumulation period, common shares will be purchased at a price equal to 85% of the fair market value per share on either the first day of the offering period or the last date of the accumulation period, whichever is less. The maximum number of shares that may be purchased on any purchase date may not exceed 875 shares for a total of 3,500 shares per a 24-month offering period. In addition, no participant may purchase more than $25,000 worth of common stock in any one calendar year period.

The Company initially reserved 600,000 common shares for issuance under the ESPP. The share reserve will automatically increase in January of each calendar year during the term of the ESPP, beginning with calendar year 2011, by the lesser of 0.75% of the outstanding common shares or 250,000 shares. This increase was 167,229 shares, 192,000 shares and 192,000 shares for the years ended June 30, 2016, 2015 and 2014, respectively.

The ESPP is compensatory and results in compensation expense. The fair values of common shares to be issued under the ESPP were determined using the Black-Scholes option valuation model with the following assumptions:

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	Year Ended June 30,
	2016	2015	2014
Volatility rate	32.2% - 34.8%	31.4% - 50.0%	50.0%
Risk-free interest rate	0.3% - 0.9%	0.1% - 0.6%	0.1% - 0.4%
Expected term	1.3 years	1.3 years	1.3 years
Dividend yield	—%	—%	—%

The weighted-average estimated fair value of employee stock purchase rights granted pursuant to the ESPP during the years ended June 30, 2016, 2015 and 2014 was $2.85, $2.80 and $2.89 per share, respectively.

Share-based Compensation Expenses

The total share-based compensation expense related to stock options, ESPP and RSUs described above, recognized in the consolidated statements of operations for the years presented was as follows:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Cost of goods sold	$	636	$	669	$	614
Research and development	1,115		779		786
Selling, general and administrative	2,562		3,042		1,975
	$	4,313	$	4,490	$	3,375

Total unrecognized share-based compensation expense as of June 30, 2016 was $5.8 million including estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.6 years.

9. Employee Benefit Plans

The Company maintains a 401(k) retirement plan for the benefit of qualified employees in the U.S.. Employees who participate may elect to make salary deferral contributions to the plan up to 100% of the employees' eligible salary subject to annual Internal Revenue Code maximum limitations. The employer's contribution is discretionary. The Company had not made any contributions for eligible employees as of June 30, 2016.

The Company makes mandatory contributions for its employees to the respective local governments in terms of retirement, medical insurance and unemployment insurance, where applicable, according to labor and social security laws and regulations of the countries and areas in which the Company operates. The contribution rates for retirement are 7.7%, 13.0% to 20.0% and 6.0% for employees in the U.S., China and Taiwan, respectively. The Company has no obligations for the payment of such social benefits beyond the required contributions as set out above.

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10. Income Taxes

The provision for income taxes is comprised of:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. federal taxes:
Current	$	152		$	66		$	(65	)
Deferred	650			852			1,144
Non-U.S. taxes:
Current	3,382			3,059			2,316
Deferred	(169		)	(15		)	(608		)
State taxes, net of federal benefit:
Current	6			(65		)	(38		)
Deferred	—			—			20
Total provision for income taxes	$	4,021		$	3,897		$	2,769

The reconciliation of the federal statutory income tax rate to our effective income tax rate is as follows (in percentage):

	Year Ended June 30,
	2016		2015		2014
United States statutory rate	34.0	%	34.0	%	34.0	%
State taxes, net of federal benefit	0.4		1.2		2
Stock based compensation	(0.4	)	0.4		3.2
Foreign taxes, net	440.3		(145.7	)	(900.2	)
Research and development credit	(69.3	)	10		45.4
Non-deductible expenses	1.7		(0.7	)	(8.7	)
Other	(0.1	)	—		(2.3	)
	406.6	%	(100.8	)%	(826.6	)%

The domestic and foreign components of income (loss) before taxes are:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. operations	$	4,259		$	4,614		$	4,184
Non-U.S. operations	(3,270		)	(8,480		)	(4,519		)
Income (loss) before income taxes	$	989		$	(3,866	)	$	(335	)

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Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities are as follows:

	June 30,
	2016			2015
	(in thousands)
Deferred tax assets:
Accrued compensation	$	2,267		$	1,915
Net operating loss carryforwards	67			81
Depreciation	10,345			11,079
Tax credits	6,069			5,171
Accruals and reserves	934			658
Total deferred tax assets	19,682			18,904
Valuation allowance	(2,894		)	(2,700		)
Total deferred tax assets, net of valuation allowance	16,788			16,204
Deferred tax liabilities:
Depreciation and amortization	(7,388		)	(5,651		)
Accruals and reserves	(241		)	(523		)
Total deferred tax liabilities	(7,629		)	(6,174		)
Net deferred tax assets	$	9,159		$	10,030

The breakdown between current and non-current deferred tax assets and liabilities is as follows:

	June 30,
	2016			2015
	(in thousands)
Long-term deferred tax assets	$	12,132		$	12,340
Long-term deferred tax liabilities	(2,973		)	(2,310		)
Net deferred tax assets	$	9,159		$	10,030

At June 30, 2016 and 2015, the Company provided a valuation allowance for its state research and development credit carryforward deferred tax assets, as it generated more state tax credits each year than it can utilize. The Company intends to maintain a partial valuation allowance equal to the state research and development credit carryfowards until sufficient positive evidence exists to support reversal of the valuation allowance.

At June 30, 2016, the Company had federal tax credit carryforwards of approximately $3.0 million. The federal tax credits begin to expire in 2029, if not utilized. At June 30, 2016, the Company had no state net operating loss carryforwards and had tax credit carryforwards of approximately $4.6 million.  Approximately $0.2 million of the state tax credits begin to expire in 2018, if not utilized. The remaining $4.4 million of the state tax credits carryforward indefinitely.

The Company has not provided for withholding taxes on the undistributed earnings of its foreign subsidiaries because it intends to reinvest such earnings indefinitely. As of June 30, 2016, the cumulative amount of undistributed earnings of its foreign entities considered permanently reinvested is $82.2 million. The determination of the unrecognized deferred tax liability on these earnings is not practicable. Should the Company decide to remit this income to its Bermuda parent company in a future period, its provision for income taxes may increase materially in that period.

At June 30, 2016, the Company had approximately $6.7 million in total unrecognized tax benefits. A reconciliation of the beginning and ending amount of unrecognized tax benefits from July 1, 2014 to June 30, 2016 is as follows:

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	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Balance at beginning of year	$	6,412		$	6,760		$	7,668
Additions based on tax positions related to the current year	388			297			329
Additions (reductions) based on tax positions related to prior years	—			4			(18		)
Reductions due to lapse of applicable statute of limitations	(57		)	(649		)	(1,219		)
Balance at end of year	$	6,743		$	6,412		$	6,760

At June 30, 2016, the total unrecognized tax benefits of $6.7 million included $5.4 million of unrecognized tax benefits that have been netted against the related deferred tax assets. The remaining $1.3 million of unrecognized tax benefits was recorded within long-term income tax payable on the Company's consolidated balance sheet as of June 30, 2016.

The total unrecognized tax benefits of $6.7 million at June 30, 2016 included $4.4 million that, if recognized, would reduce the effective income tax rate in future periods. It is reasonably possible that the Company will recognize approximately $0.6 million reduction to its uncertain tax positions during the next twelve months.

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. To the extent accrued interest and penalties do not ultimately become payable, amounts accrued will be reduced and reflected as a reduction of the overall income tax provision in the period that such determination is made. The amount of interest and penalties accrued at June 30, 2016 was $0.3 million, of which $0.03 million was recognized in the year ended June 30, 2016. The amount of interest and penalties accrued at June 30, 2015 was $0.2 million, of which $(0.1) million was recognized in the year ended June 30, 2015.

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2016 remain open to examination by U.S. federal and state tax authorities. The tax years 2009 to 2016 remain open to examination by foreign tax authorities.

The Company's income tax returns are subject to examinations by the Internal Revenue Service and other tax authorities in various jurisdictions. In accordance with the guidance on the accounting for uncertainty in income taxes, the Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. If the Company's estimate of income tax liabilities proves to be less than the ultimate assessment, then a further charge to expense would be required. If events occur and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary.

11. Segment and Geographic Information

The Company is organized as, and operates in, one operating segment: the design, development and supply of power semiconductor products for computing, consumer electronics, communication and industrial applications. The chief operating decision-maker is the Chief Executive Officer. The financial information presented to the Company's Chief Executive Officer is on a consolidated basis, accompanied by information about revenue by customer and geographic region, for purposes of evaluating financial performance and allocating resources. The Company has one business segment, and there are no segment managers who are held accountable for operations, operating results and plans for products or components below the consolidated unit level. Accordingly, the Company reports as a single operating segment.

The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets.

The revenue by geographical location in the following tables is based on the country or region in which the products were shipped to:

92

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Hong Kong	$	290,555	$	277,825	$	271,728
China	37,444		42,103		38,740
South Korea	1,960		2,253		3,033
United States	3,110		2,942		1,976
Other countries	2,592		2,812		2,644
	$	335,661	$	327,935	$	318,121

The following is a summary of revenue by product type:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Power discrete	$	252,063	$	248,716	$	246,033
Power IC	69,344		63,529		53,993
Packaging and testing services	14,254		15,690		18,095
	$	335,661	$	327,935	$	318,121

Long-lived assets, consisting of property, plant and equipment by geographical area are as follows:

	June 30,
	2016		2015
	(in thousands)
China	$	64,272	$	71,618
United States	51,214		47,439
Other countries	598		522
	$	116,084	$	119,579

93

12. Restricted Net Assets

Laws and regulations in China permit payments of dividends by the Company's subsidiaries in China only out of their retained earnings, if any, as determined in accordance with China accounting standards and regulations. Each China subsidiary is also required to set aside at least 10% of its after-tax profit, if any, based on China accounting standards each year to its statutory reserves until the cumulative amount of such reserves reaches 50% of its registered capital. As a result of these China laws and regulations, the Company's China subsidiaries are restricted in their abilities to transfer a portion of their net assets to the Company. As of June 30, 2016 and 2015, such restricted portion amounted to approximately $84.2 million and $86.8 million, or 34.8% and 31.4%, of our total consolidated net assets, respectively. As the Company's China subsidiaries are not revenue generating operating units, the Company does not expect to repatriate funds in the form of dividends, loans or advances from its China subsidiaries for working capital and other funding purposes.

13. Commitments and Contingencies

Operating lease obligations

The Company leases its office facilities and certain office equipment under non-cancelable operating leases that expire through 2023. Rent expense related to the Company's operating leases was $3.5 million, $3.5 million and $3.4 million for the fiscal years ended June 30, 2016, 2015 and 2014, respectively. Certain leases contain escalation clauses calling for increased rents.

Future minimum lease payments of these leases at June 30, 2016 are as follows:

Year ending June 30,	Operating Leases
	(in thousands)
2017	$	3,200
2018	2,249
2019	1,849
2020	1,484
2021	554
Thereafter	574
	$	9,910

Purchase commitments

As of June 30, 2016 and 2015, the Company had approximately $39.6 million and $29.2 million, respectively, of outstanding purchase commitments primarily for purchases of semiconductor raw materials, wafers, spare parts and packaging and testing services.

As of June 30, 2016 and 2015, the Company had approximately $6.6 million and $3.7 million, respectively, of capital commitments for the purchase of property and equipment.

Contingencies and indemnities

The Company is currently not a party to any material legal proceedings. The Company has in the past, and may from time to time in the future, becomes involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, the Company could incur significant costs in the defense thereof or could suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it contracted with various parties. Pursuant to these agreements, the Company may be obligated to indemnify another party to such an agreement with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold, certain intellectual property rights, specified environmental matters and certain income taxes. In these circumstances, payment by the Company is customarily conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other party's

94

claim. Further, the Company's obligations under these agreements maybe limited in time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. The Company has not historically paid or recorded any material indemnifications and no accrual was made at June 30, 2016 and 2015.

The Company has agreed to indemnify its directors and certain employees as permitted by law and pursuant to its bye-laws, and has entered into indemnification agreements with its directors and executive officers. The Company has not recorded a liability associated with these indemnification arrangements, as it historically has not incurred any material costs associated with such indemnification obligations. Costs associated with such indemnification obligations may be mitigated by insurance coverage that the Company maintains, however, such insurance may not cover any, or may cover only a portion of, the amounts the Company may be required to pay. In addition, the Company may not be able to maintain such insurance coverage in the future.

Joint Venture

In March 2016, we executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

Environmental matters

The Company is subject to various federal, state, local, and foreign laws and regulations governing environmental

matters, including the use, handling, discharge, and disposal of hazardous materials. The Company believes that it has been in material compliance with applicable environmental regulations and standards. Complying with current laws and regulations has not had a material adverse effect on the Company’s financial condition and results of operations. However, it is possible that additional environmental issues may arise in the future, which the Company cannot currently predict.

95

SCHEDULE I

ALPHA AND OMEGA SEMICONDUCTOR LIMITED (PARENT COMPANY BASIS)

CONDENSED UNCONSOLIDATED BALANCE SHEETS

(in thousands, except par value per share)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

The accompanying notes to Schedule I are an integral part of these financial statements.

96

SCHEDULE I

ALPHA AND OMEGA SEMICONDUCTOR LIMITED (PARENT COMPANY BASIS)

CONDENSED UNCONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands)

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

The accompanying notes to Schedule I are an integral part of these financial statements.

97

SCHEDULE I

ALPHA AND OMEGA SEMICONDUCTOR LIMITED (PARENT COMPANY BASIS)

CONDENSED UNCONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(in thousands)

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

The accompanying notes to Schedule I are an integral part of these financial statements.

98

SCHEDULE I

ALPHA AND OMEGA SEMICONDUCTOR LIMITED (PARENT COMPANY BASIS)

CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

The accompanying notes to Schedule I are an integral part of these financial statements.

99

ALPHA AND OMEGA SEMICONDUCTOR LIMITED (PARENT COMPANY BASIS)

NOTES TO THE CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

100

SCHEDULE II

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

VALUATION AND QUALIFYING ACCOUNTS

(in thousands)

	Allowance			Allowance			Allowance
	for Doubtful			for Price			for Deferred
	Accounts			Adjustments			Tax Assets
June 30, 2013	$	752		$	13,152		$	2,127
Additions	—			64,987			268
Reductions	(722		)	(63,576		)	—
June 30, 2014	30			14,563			2,395
Additions	—			87,189			305
Reductions	—			(82,314		)	—
June 30, 2015	30			19,438			2,700
Additions	—			90,967			194
Reductions	—			(93,705		)	—
June 30, 2016	$	30		$	16,700		$	2,894

101

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

August 26, 2016

ALPHA AND OMEGA SEMICONDUCTOR LIMITED
By:	/s/ MIKE F. CHANG
	Mike F. Chang
	Chief Executive Officer
	(Principal Executive Officer)

102

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Mike F. Chang and Yifan Liang, and each or any one of them, his or her true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments to this report, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/s/    MIKE F. CHANG	Chairman of the Board and Chief Executive Officer	August 26, 2016
Mike F. Chang, Ph.D.	(Principal Executive Officer)
/s/    YIFAN LIANG	Chief Financial Officer and Corporate Secretary	August 26, 2016
Yifan Liang	(Principal Financial Officer and Principal Accounting Officer)
/s/    YUEH-SE HO	Director and Chief Operating Officer	August 26, 2016
Yueh-Se Ho, Ph.D.
/s/    ROBERT I. CHEN	Director	August 26, 2016
Robert I. Chen
/s/    MICHAEL L. PFEIFFER	Director	August 26, 2016
Michael L. Pfeiffer
/s/    KING OWYANG	Director	August 26, 2016
King Owyang
/s/    MICHAEL J. SALAMEH	Director	August 26, 2016
Michael J. Salameh

103

(b) Index to Exhibits:

Number	Description
3.1	Memorandum of Association of Registrant (incorporated by reference to Exhibit 3.1 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
3.2	Amended and Restated Bye-laws of Registrant (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed with the Commission on November 12, 2015)
4.1	Form of Common Share Certificate (incorporated by reference to Exhibit 4.2 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.1	2000 Share Plan (incorporated by reference to Exhibit 10.1 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.2	Form of Option Agreement under 2000 Share Plan (incorporated by reference to Exhibit 10.2 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.3	2009 Share Option/Share Issuance Plan (incorporated by reference to Exhibit 10.3 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.4	Form of Option Agreement under 2009 Share Plan (incorporated by reference to Exhibit 4.4 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.5	Form of Restricted Share Unit Issuance Agreement under 2009 Share Plan (incorporated by reference to Exhibit 4.5 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.6	Employee Share Purchase Plan (incorporated by reference to Exhibit 10.15 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.7††	Foundry Agreement dated as of January 10, 2002 between the Registrant and Shanghai Hua Hong NEC Electronics Company, Limited (incorporated by reference to Exhibit 10.16 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.8††	First Addendum to Foundry Service Agreement dated as of July 28, 2005 between the Registrant and Shanghai Hua Hong NEC Electronics Company, Limited (incorporated by reference to Exhibit 10.17 from Registration Statement on Form F-1 (File No. 333-165823) initially filed with the Commission on March 31, 2010)
10.9††	Second Addendum to Foundry Service Agreement dated as of April 11, 2007 between the Registrant and Shanghai Hua Hong NEC Electronics Company, Limited (incorporated by reference to Exhibit 10.18 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.10††	Foundry Service Agreement dated as of November 3, 2009 between Alpha & Omega Semiconductor (Macau), Ltd. and Shanghai Hua Hong NEC Electronics Company, Limited (incorporated by reference to Exhibit 10.6 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.11	Non-Exclusive Distributor Agreement dated as of July 27, 2010 between Alpha & Omega Semiconductor (Hong Kong) Limited and Frontek Technology Corporation (incorporated by reference to Exhibit 4.17 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.12††	Supplement to Non-Exclusive Distributor Agreement dated as of July 27, 2010 between Alpha & Omega Semiconductor (Hong Kong) Limited and Frontek Technology Corporation (incorporated by reference to Exhibit 4.18 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.13††	First Amendment of Supplement to Distribution Agreement dated as of April 21, 2011 between Alpha & Omega Semiconductor (Hong Kong) Limited and Frontek Technology Corporation(incorporated by reference to Exhibit 10.15 from Annual Report Form 10-K (File No. 001-34717) filed with the Commission on September 9, 2011)

104

10.14	Supplement to Distribution Agreement dated as of July 27, 2010 between the Registrant and Frontek Technology Corporation (incorporated by reference to Exhibit 10.1 from Quarterly Report on Form 10-Q (File No. 001-34717) filed with the Commission on February 6, 2015)
10.15	Non-Exclusive Distributor Agreement dated as of July 27, 2010 between Alpha & Omega Semiconductor (Hong Kong) Limited and Promate Electronic Co., Ltd. (incorporated by reference to Exhibit 4.19 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.16††	Supplement to Non-Exclusive Distributor Agreement dated as of July 27, 2010 between Alpha & Omega Semiconductor (Hong Kong) Limited and Promate Electronic Co., Ltd. (incorporated by reference to Exhibit 4.20 from Annual Report on Form 20-F (File No. 001-34717) filed with the Commission on September 2, 2010)
10.17††	First Amendment of Supplement to Distribution Agreement dated as of April 21, 2011 between Alpha & Omega Semiconductor (Hong Kong) Limited and Promate Electronic Co., Ltd. (incorporated by reference to Exhibit 10.18 from Annual Report Form 10-K (File No. 001-34717) filed with the Commission on September 9, 2011)
10.18	Supplement to Distribution Agreement dated as of July 27, 2010 between the Registrant and Promate Electronic Co., Ltd (incorporated by reference to Exhibit 10.2 from Quarterly Report on Form 10-Q (File No. 001-34717) filed with the Commission on February 6, 2015)
10.19	Lease dated as of December 23, 2009 between Alpha and Omega Semiconductor Incorporated and OA Oakmead II, LLC (incorporated by reference to Exhibit 10.19 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.20	Guarantee dated as of January 5, 2010 between the Registrant and OA Oakmead II, LLC (incorporated by reference to Exhibit 10.20 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.21	Form of Indemnification Agreement (incorporated by reference to Exhibit 10.11 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.22	Form of Employment Agreement between the Registrant and Mike F. Chang (incorporated by reference to Exhibit 10.13 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.23	Form of Retention Agreement (incorporated by reference to Exhibit 10.14 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.24	Form of Restricted Shares Purchase Agreement (incorporated by reference to Exhibit 10.21 from Registration Statement on Form F-1 (File No. 333-165823) filed with the Commission on March 31, 2010)
10.25	Third Addendum to Foundry Service Agreement dated as of March 6, 2012 by and among the Registrant and Shanghai Hua Hong NEC Electronics Company, Limited (incorporated by reference to Exhibit 10.34 from Annual Report on Form 10-K (File No.: 001-34717) filed with the Commission on August 31, 2012)
10.26	Amended Form of Restricted Share Unit Issuance Agreement (incorporated by reference to Exhibit 10.35 from Annual Report on Form 10-K (File No.: 001-34717) filed with the Commission on August 31, 2012)
10.27	Summary of Fiscal Year 2014 Executive Incentive Plan (incorporated by reference to Exhibit 10.34 from Annual Report on Form 10-K (File No: 001-34717) filed with the Commission on August 30, 2013)
10.28	Form of Director's Share Option Agreement under the Automatic Grant Program (incorporated by reference to Exhibit 10.1 from Quarterly Report on Form 10-Q (File No: 001-34717) filed with the Commission on November 6, 2013)
10.29	Amendment to Automatic Grant Program for Non-Employee Directors under the 2009 Share Option/Share Issuance Plan (incorporated by reference to Exhibit 10.2 from Quarterly Report on Form 10-Q (File No: 001-34717) filed with the Commission on May 9, 2014)
10.30	Form of Restricted Share Unit Agreement (incorporated by reference to Exhibit 10.3 from Quarterly Report on Form 10-Q (File No: 001-34717) filed with the Commission on May 9, 2014)
10.31	Summary of Fiscal Year 2015 Executive Incentive Plan (incorporated by reference to Exhibit 10.39 from Annual Report on Form 10-K (File No. 001-34717) filed with the Commission on August 29, 2014)

105

10.32	Separation Agreement, dated as of March 26, 2015, between the Company and Dr. Hamza Yilmaz (incorporated by reference to Exhibit 10.1 from Registration Statement on Form 8-K (File No. 001-34717) filed with the Commission on March 27, 2015)
10.33	Form of Consulting Agreement between Registrant and Tony Grizelj dated as of August 17, 2015 . (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed with the Commission on August 5, 2015)
10.34	Joint Venture Contract on Incorporation of Chongqing Alpha and Omega Semiconductor Limited, dated as of March 29, 2016, between the Company, certain subsidiaries of the Company and Chongqing Funds (English Translation) (incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed with the Commission on May 10, 2016)
10.35	Alpha and Omega Semiconductor Limited Calendar Year 2016 Executive Incentive Plan (incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q filed with the Commission on May 10, 2016)
21.1*	List of Subsidiaries of the Registrant
23.1*	Consent of Grant Thornton LLP, independent registered public accounting firm of Registrant
31.1*	Certification of Chief Executive Officer required by Rule 13(a)-14(a) under the Exchange Act
31.2*	Certification of Chief Financial Officer required by Rule 13(a)-14(a) under the Exchange Act
32.1*	Certification of Chief Executive Officer required by Rule 13a-14(b) under the Exchange Act and Section 1350 of Chapter 63 of Title 18 of the United States Code
32.2*	Certification of Chief Financial Officer required by Rule 13a-14(b) under the Exchange Act and Section 1350 of Chapter 63 of Title 18 of the United States Code
101.INS	XBRL Instance
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation
101.DEF	XBRL Taxonomy Extension Definition
101.LAB	XBRL Taxonomy Extension Labels
101.PRE	XBRL Taxonomy Extension Presentation

* Filed with this Annual Report on Form 10-K.

†† Confidential treatment has been granted for certain information contained in this document pursuant to an order of the Securities and Exchange Commission. Such information has been omitted and filed separately with the Securities and Exchange Commission.

106

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT
Subsidiary Name	Incorporated Location	Percentage Owned
Alpha and Omega Semiconductor Incorporated	California, United States	100% owned by AOS
Alpha and Omega Semiconductor (Cayman) Ltd.	Cayman	100% owned by AOS
Alpha and Omega Semiconductor (Shanghai) Co., Ltd.	China	100% owned by AOS
Alpha & Omega Semiconductor (Shenzhen) Limited	China	100% owned by AOS
Alpha & Omega Semiconductor (Hong Kong) Limited	Hong Kong	100% owned by AOS
Alpha & Omega Semiconductor (Macau), Ltd.	Macau	100% owned by AOS
Alpha & Omega Semiconductor (Taiwan) Limited	Taiwan	100% owned by AOS
Agape Package Manufacturing Ltd.	Cayman	100% owned by AOS
Agape Package Manufacturing (Shanghai) Ltd.	China	100% owned by AOS
Agape Limited	Hong Kong	100% owned by AOS
Jireh Semiconductor Incorporated	Oregon, United States	100% owned by AOS
Chongqing Alpha and Omega Semiconductor Limited	Chongqing, China	51% owned by AOS

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated August 26, 2016, with respect to the consolidated financial statements, schedules, and internal control over financial reporting in the Annual Report of Alpha and Omega Semiconductor Limited on Form 10-K for the year ended June 30, 2016. We hereby consent to the incorporation by reference of said reports in the Registration Statements of Alpha Omega Semiconductor Limited and on Forms S-8 (File No. 333-207987, effective November 13, 2015; File No. 333-190935, effective August 30, 2013; File No. 333-186480, effective February 6, 2013; File No. 333-180126, effective March 15, 2012; File No. 333-172173, effective February 11, 2011; and File No. 333-166403, effective April 30, 2010).

/s/ GRANT THORNTON LLP

San Francisco, California

August 26, 2016

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, certify that:

1. I have reviewed this report on Form 10-K of Alpha and Omega Semiconductor Limited;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 26, 2016

/s/    MIKE F. CHANG

Mike F. Chang

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, certify that:

1. I have reviewed this report on Form 10-K of Alpha and Omega Semiconductor Limited;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 26, 2016

/s/    YIFAN LIANG     

Yifan Liang
Chief Financial Officer and Corporate Secretary

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. § 1350, AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, the chief executive officer of Alpha and Omega Semiconductor Limited (the “Company”), certify for the purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge,

a. the Annual Report of the Company on Form 10-K for the fiscal year ended June 30, 2016 (the “Report”), fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

b. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 26, 2016

/s/    MIKE F. CHANG

Mike F. Chang

 Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. § 1350, AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, the chief financial officer of Alpha and Omega Semiconductor Limited (the “Company”), certify for the purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge,

a. the Annual Report of the Company on Form 10-K for the fiscal year ended June 30, 2016 (the “Report”), fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

b. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 26, 2016

/s/    YIFAN LIANG

Yifan Liang
Chief Financial Officer and Corporate Secretary

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jul. 31, 2016	Dec. 31, 2015
Entity Information [Line Items]
Entity Registrant Name	ALPHA & OMEGA SEMICONDUCTOR Ltd
Entity Central Index Key	0001387467
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		22,755,936
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 162

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Current assets:
Cash and cash equivalents	$ 87,774	$ 106,085
Restricted cash	188	368
Accounts receivable, net	26,594	38,781
Inventories	68,848	64,175
Other current assets	4,526	4,279
Total current assets	187,930	213,688
Property, plant and equipment, net	116,084	119,579
Deferred income tax assets - long term	12,132	12,340
Other long-term assets	2,359	2,297
Total assets	318,505	347,904
Current liabilities:
Accounts payable	42,718	44,083
Accrued liabilities	22,590	19,225
Income taxes payable	2,356	1,372
Deferred margin	997	716
Capital leases	819	941
Total current liabilities	69,480	66,337
Income taxes payable - long term	1,577	1,601
Deferred income tax liabilities	2,973	2,310
Other long term liabilities	2,436	1,017
Total liabilities	76,466	71,265
Commitments and contingencies (Note 13)
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	0	0
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57	55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199)	(8,593)
Additional paid-in capital	191,444	181,040
Accumulated other comprehensive income	769	905
Retained earnings	100,071	103,232
Total Alpha and Omega Semiconductor Limited shareholders’ equity	242,142	276,639
Noncontrolling interest	(103)	0
Total equity	242,039	276,639
Total liabilities and equity	$ 318,505	$ 347,904

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2016	Jun. 30, 2015
Common shares, par value (in dollars per share)	$ 0.002	$ 0.002
Common shares, authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	28,405,000	27,314,000
Common stock, shares outstanding (in shares)	22,754,000	26,316,000
Preferred stock, par value (in dollars per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury shares (in shares)	5,651,000	998,000

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 335,661	$ 327,935	$ 318,121
Cost of goods sold	269,839	267,453	259,050
Gross profit	65,822	60,482	59,071
Operating expenses:
Research and development	26,006	27,075	24,409
Selling, general and administrative	37,874	37,625	34,554
Impairment of long-lived assets	432	0	0
Total operating expenses	64,312	64,700	58,963
Operating income (loss)	1,510	(4,218)	108
Interest income and other income (loss), net	(498)	533	(177)
Interest expense	(23)	(181)	(266)
Income (loss) before income taxes	989	(3,866)	(335)
Income tax expense	4,021	3,897	2,769
Net loss including noncontrolling interest	(3,032)	(7,763)	(3,104)
Net loss attributable to noncontrolling interest	(104)	0	0
Net loss attributable to Alpha and Omega Semiconductor Limited	$ (2,928)	$ (7,763)	$ (3,104)
Net loss per common share attributable to Alpha and Omega Semiconductor Limited
Basic (in dollars per share)	$ (0.13)	$ (0.29)	$ (0.12)
Diluted (in dollars per share)	$ (0.13)	$ (0.29)	$ (0.12)
Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net loss per share:
Basic (in shares)	22,452	26,429	25,952
Diluted (in shares)	22,452	26,429	25,952

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss including noncontrolling interest	$ (3,032)	$ (7,763)	$ (3,104)
Other comprehensive income, net of tax, foreign currency translation adjustment	(135)	(128)	76
Comprehensive loss	(3,167)	(7,891)	(3,028)
Noncontrolling interest	(103)	0	0
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$ (3,064)	$ (7,891)	$ (3,028)

XML

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total AOS Shareholders' Equity [Member]	Convertible Preferred Shares [Member]	Common Shares [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	$ 281,600
Balance (in shares) at Jun. 30, 2013			0
Balance (in shares) at Jun. 30, 2013				25,882,000
Balance (in shares) at Jun. 30, 2013					(226,000)
Balance at Jun. 30, 2013		$ 281,600	$ 0	$ 51	$ (2,054)	$ 168,352	$ 957	$ 114,294
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and release of RSUs (in shares)				552,000
Exercise of common stock options and release of RSUs	1,099	1,099		$ 1		1,098
Reissuance of Treasury Stock (in shares)					6,000
Reissuance of Treasury Stock	83	0			$ 83			(83)
Reissuance of treasury stock and tax withholding on RSUs	0
Shares Paid for Tax Withholding for Share Based Compensation				(41,000)
Adjustments Related to Tax Withholding for Share-based Compensation	(316)	(316)				(316)
Issuance of common shares under Employee Stock Purchase Plan (in shares)				251,000
Issuance of common shares under Employee Stock Purchase Plan	$ 1,576	1,576		$ 1		1,575
Repurchase of common shares under shares repurchase program (in shares)	(119,594)				(120,000)
Repurchase of common shares under shares repurchase program	$ (918)	(918)			$ (918)
Share-based compensation expense	3,375	3,375				3,375
Net loss	(3,104)	(3,104)						(3,104)
Cumulative translation adjustment	76
Balance (in shares) at Jun. 30, 2014			0
Balance (in shares) at Jun. 30, 2014				26,644,000
Balance (in shares) at Jun. 30, 2014					(340,000)
Balance at Jun. 30, 2014		283,388	$ 0	$ 53	$ (2,889)	174,084	1,033	111,107	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to noncontrolling interest	0								0
Net loss including noncontrolling interest	(3,104)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent		76					76
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest									0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	76
Total equity	283,388
Exercise of common stock options and release of RSUs (in shares)				475,000
Exercise of common stock options and release of RSUs	1,409	1,409		$ 1		1,408
Reissuance of Treasury Stock (in shares)					8,000
Reissuance of Treasury Stock	112	0			$ 112			(112)
Reissuance of treasury stock and tax withholding on RSUs	0
Shares Paid for Tax Withholding for Share Based Compensation				(61,000)
Adjustments Related to Tax Withholding for Share-based Compensation	(539)	(539)				(539)
Issuance of common shares under Employee Stock Purchase Plan (in shares)				256,000
Issuance of common shares under Employee Stock Purchase Plan	$ 1,598	1,598		$ 1		1,597
Repurchase of common shares under shares repurchase program (in shares)	(666,230)				(666,000)
Repurchase of common shares under shares repurchase program	$ (5,816)	(5,816)			$ (5,816)
Share-based compensation expense	4,490	4,490				4,490
Net loss	(7,763)	(7,763)						(7,763)
Cumulative translation adjustment	$ (128)
Balance (in shares) at Jun. 30, 2015	0		0
Balance (in shares) at Jun. 30, 2015	27,314,000			27,314,000
Balance (in shares) at Jun. 30, 2015	(998,000)				(998,000)
Balance at Jun. 30, 2015	$ 276,639	276,639	$ 0	$ 55	$ (8,593)	181,040	905	103,232	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to noncontrolling interest	0								0
Net loss including noncontrolling interest	(7,763)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent		(128)					(128)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest									0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(128)
Total equity	276,639
Exercise of common stock options and release of RSUs (in shares)				926,000
Exercise of common stock options and release of RSUs	5,330	5,330		$ 1		5,329
Reissuance of Treasury Stock (in shares)					42,000
Reissuance of Treasury Stock	233	242			$ 475			(233)
Reissuance of treasury stock and tax withholding on RSUs	242
Shares Paid for Tax Withholding for Share Based Compensation				(93,000)
Adjustments Related to Tax Withholding for Share-based Compensation	(1,036)	(1,036)				(1,036)
Issuance of common shares under Employee Stock Purchase Plan (in shares)				258,000
Issuance of common shares under Employee Stock Purchase Plan	$ 1,799	1,799		$ 1		1,798
Repurchase of common shares under shares repurchase program (in shares)	(4,695,499)				(4,695,000)
Repurchase of common shares under shares repurchase program	$ (42,081)	(42,081)			$ (42,081)
Share-based compensation expense	4,313	4,313				4,313
Net loss	(2,928)	(2,928)						(2,928)
Cumulative translation adjustment	$ (135)
Balance (in shares) at Jun. 30, 2016	0		0
Balance (in shares) at Jun. 30, 2016	28,405,000			28,405,000
Balance (in shares) at Jun. 30, 2016	(5,651,000)				(5,651,000)
Balance at Jun. 30, 2016	$ 242,142	242,142	$ 0	$ 57	$ (50,199)	$ 191,444	769	$ 100,071	(103)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to noncontrolling interest	(104)								(104)
Net loss including noncontrolling interest	(3,032)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent		$ (136)					$ (136)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest									$ 1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(135)
Total equity	$ 242,039

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss including noncontrolling interest	$ (3,032)	$ (7,763)	$ (3,104)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	27,303	27,547	27,876
Allowance for doubtful accounts	0	0	(363)
Share-based compensation expense	4,313	4,490	3,375
Deferred income taxes, net	871	785	574
(Gain) loss on disposal of property and equipment	95	(103)	(160)
Impairment of long-lived assets	432	0	0
Government grant via forgiven loan	0	(250)	0
Changes in assets and liabilities:
Accounts receivable	12,187	(2,247)	2,126
Inventories	(4,674)	2,386	1,779
Other current and long-term assets	(310)	(517)	(1,429)
Accounts payable	(1,162)	3,335	5,517
Income taxes payable	960	(1,276)	(916)
Accrued and other liabilities	3,199	1,282	2,685
Net cash provided by operating activities	40,182	27,669	37,960
Cash flows from investing activities
Purchase of property and equipment	(21,901)	(21,492)	(9,395)
Proceeds from sale of property and equipment	0	272	244
(Increase) decrease in restricted cash	180	(125)	(40)
Net cash used in investing activities	(21,721)	(21,345)	(9,191)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036)	(539)	(316)
Proceeds from exercise of stock options and ESPP	7,371	3,007	2,675
Payment for repurchase of common shares	(42,081)	(5,816)	(918)
Repayments of borrowings	0	(13,571)	(3,571)
Principal payments on capital leases	(940)	(1,061)	(1,267)
Net cash used in financing activities	(36,686)	(17,980)	(3,397)
Effect of exchange rate changes on cash and cash equivalents	(86)	(47)	10
Net increase (decrease) in cash and cash equivalents	(18,311)	(11,703)	25,382
Cash and cash equivalents at beginning of year	106,085	117,788	92,406
Cash and cash equivalents at end of year	87,774	106,085	117,788
Supplemental disclosures of cash flow information:
Cash paid for interest	9	171	304
Cash paid for income taxes	3,139	4,813	2,585
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	5,711	5,728	3,390
Property and equipment acquired under capital leases	2,449	0	1,921
Reissuance of Treasury Stock	$ 233	$ 112	$ 83

XML

The Company and Significant Accounting Policies

12 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The Company and Significant Accounting Policies

The Company and Significant Accounting Policies

The Company

Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”, "AOS", "we" or "us") design, develop and supply a broad range of power semiconductors. The Company's portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. The Company conducts its operations primarily in the United States of America (“USA”), Hong Kong, China, Taiwan, Korea and Japan.

Basis of Preparation

The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and a subsidiary in which it has a controlling interest after elimination of inter-company balances and transactions. The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP").

Reclassification

The Company has reclassified certain amounts previously reported in its financial statements to conform to the current presentation. These reclassifications did not have a material impact on our consolidated financial statements.

Correction of Errors

In this Annual Report on Form 10-K, certain prior year financial information has been restated due to an accounting correction.  During the quarter ended March 31, 2016, the Company identified and recorded immaterial errors related to the fiscal years ended June 30, 2015, 2014 and 2013.  The immaterial errors resulted from overstatement of long-term deferred income tax liabilities and income tax expenses.  The overall impact of the errors on the Company's consolidated financial position and results of operations is not material and as such, previously filed Annual Reports on Form 10-K for the years affected by the errors have not been amended.

The adjustments resulted in a decrease in net loss of $172,000, $204,000 and $149,000 for the years ended June 30, 2015, 2014 and 2013, respectively and a decrease in basic and diluted net loss per common share of $0.01 for the years ended June 30, 2015, 2014 and 2013. The impact to the consolidated balance sheets as of June 30, 2015, 2014 and 2013 was a decrease in deferred income tax liabilities of $525,000, $353,000 and $149,000, respectively and an increase in retained earnings by the same amounts.

Use of Estimates

The preparation of our consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Foreign Currency Transactions and Translation

Most of the Company's principal subsidiaries use U.S. dollars as their functional currency because their transactions are primarily conducted and settled in U.S. dollars. All of their revenues and a significant portion of their operating expenses are denominated in U.S. dollars. The functional currencies for the Company's in-house packaging and testing facilities in China are U.S. dollars, and a significant majority of their capital expenditures are denominated in U.S. dollars. Foreign currency transactions are translated into the functional currencies using the exchange rates prevailing at the dates of the transactions. Foreign exchange gains and losses, resulting from the settlement of such transactions and from the remeasurement of monetary assets and liabilities denominated in foreign currencies using exchange rates at balance sheet date and non-monetary assets and liabilities using historical exchange rates, are recognized in the consolidated statements of operations.

For the Company's subsidiaries which use the local currency as their functional currency, their results and financial position are translated into U.S. dollars using exchange rates at balance sheet dates for assets and liabilities and using average exchange rates for income and expenses items. The resulting translation differences are presented as a separate component of accumulated other comprehensive income (loss) and noncontrolling interest in the consolidated statements of equity.

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of cash on hand and short-term bank deposits with original maturities of three months or less. Cash equivalents are highly liquid investments with stated maturities of three months or less as of the dates of purchase. The carrying amounts reported for cash and cash equivalents are considered to approximate fair values based upon their short maturities.

Cash and cash equivalents are maintained with reputable major financial institutions. If, due to current economic conditions or other factors, one or more of the financial institutions with which the Company maintains deposits fails, the Company's cash and cash equivalents may be at risk. Deposits with these banks may exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.

Accounts Receivable

The allowance for doubtful accounts is based on assessment of the collectibility of accounts receivable from customers. The Company reviews the allowance by considering factors such as historical collection experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer's ability to pay. The Company writes off a receivable and charges against its recorded allowance when it has exhausted its collection efforts without success.

Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair Value of Financial Instruments

The fair value of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities. The carrying value of the company's debt is considered a reasonable estimate of fair value which is estimated by considering the current rates available to the Company for debt of the same remaining maturities, structure and terms of the debts.

Inventories

The Company carries inventories at the lower of cost (determined on a first-in, first-out basis) or market value. Cost includes semiconductor wafer and raw materials, labor, depreciation expenses and other manufacturing expenses and overhead, and packaging and testing fees paid to third parties if subcontractors are used. Inventory reserves are made based on the Company's periodic review of inventory quantities on hand as compared with its sales forecasts, historical usage, aging of inventories, production yield levels and current product selling prices. If actual market conditions are less favorable than those forecasted by management, additional future inventory write-downs may be required that could adversely affect the Company's operating results. Inventory reserves once established are not reversed until the related inventory has been sold or scrapped.

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. Historical cost includes expenditures that are directly attributable to the acquisition of the items and the costs incurred to make the assets ready for their intended use.

Depreciation is provided for on a straight-line basis over the estimated useful lives of the related assets as follows:

Building	20 years
Manufacturing machinery and equipment	3 to 10 years
Equipment and tooling	5 years
Computer equipment and software	3 to 5 years
Office furniture and equipment	5 years
Leasehold improvements	2 to 15 years based on shorter of expected economic useful life or the lease term

Equipment and construction in progress represent equipment received but necessary installation has not been fully performed or leasehold improvements have been started but not yet completed. Equipment and construction in progress are stated at cost and transferred to respective asset class when fully completed and ready for their intended use.

Internal-use software development costs are capitalized to the extent that the costs are directly associated with the development of identifiable and unique software products controlled by the Company that will probably generate economic benefits beyond one year. Costs incurred during the application development stage are required to be capitalized. The application development stage is characterized by software design and configuration activities, coding, testing and installation. Training costs and maintenance are expensed as incurred, while upgrades and enhancements are capitalized if it is probable that such expenditures will result in additional functionality. Costs included employee costs incurred and fees paid to outside consultants for the software development and implementation. Internal developed software is amortized over its estimated useful life of five years starting from the date when it is ready for its intended use.

Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are recognized as selling, general and administrative expenses in the consolidated statements of operations. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred.

Impairment of Long-Lived Assets

Long-lived assets or asset groups are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. Factors that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of assets may not be recoverable. Where such factors indicate potential impairment, the recoverability of an asset or asset group is assessed by determining if the carrying value of the asset or asset group exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the assets over the remaining economic life.  The impairment loss is measured based on the difference between the carrying amount and estimated fair value.

Goodwill

Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually, or whenever changes in circumstances indicate that the carrying amount of goodwill or intangible assets may not be recoverable. These tests are performed at the reporting unit level using a two-step, fair-value based approach. In testing for a potential impairment of goodwill, the Company first compares the carrying value of assets and liabilities to the estimated fair value. If estimated fair value is less than carrying value, then potential impairment exists. The amount of any impairment is then calculated by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value.

The process of evaluating the potential impairment of goodwill requires significant judgment at many points during the analysis, including calculating fair value of each reporting unit based on estimated future cash flows and discount rates to be applied. The Company re-evaluates its intangible assets and goodwill for impairment during the fourth quarter of fiscal year. Goodwill is recorded in other long-term assets in the Company's consolidated balance sheets.

Intangible Assets

Intangible assets are stated at cost less accumulated amortization. Intangible assets include patents and exclusive technology rights, trade names and customer relationships. Intangible assets with finite lives are amortized on a straight-line basis over the estimated periods of benefit, as follows:

Patents and exclusive technology rights	3 to 7 years
Trade name	3 years
Customer relationships	4 years

The Company evaluates its finite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to future undiscounted net cash flows expected to be generated by the asset group. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount and fair value less costs to sell. Intangible assets are recorded in other long-term assets in the Company's consolidated balance sheets.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contribution from the Chongqing funds and contributions of cash, equipments and intangible assets from the Company. The Company owns 51% and the Chongqing funds owns 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has controlling financial interest.

Revenue Recognition

The Company recognizes revenue when there is persuasive evidence that an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and when collectability is reasonably assured. The Company recognizes revenue when product is shipped to the customer, net of estimated stock rotation returns and price adjustments that it expects to provide to certain distributors.

The Company sells its products primarily to distributors, who in turn sell the products globally to various end customers. The Company allows stock rotation returns from certain distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of products purchased by distributors during a specified period. The Company records an allowance for stock rotation returns based on historical returns and individual distributor agreements. The Company also provides special pricing to certain distributors, primarily based on volume, to encourage resale of the Company's products. The Company estimates the expected price adjustments at the time revenue is recognized based on distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for its products. If actual stock rotation returns or price adjustments differ from their estimates, adjustments are recorded in the period when the actual information is known. Allowance for price adjustments is recorded against accounts receivable and the provision for stock rotation rights is included in accrued liabilities on the consolidated balance sheets.

Revenue from certain distributors is deferred until the distributor resells the products to end customers due to price protection adjustments and right of returns that cannot be reliably measured. The deferred revenue, net of the associated deferred cost of the inventory, is recorded as deferred margin on the consolidated balance sheets.

Packaging and testing services revenue is recognized upon shipment of serviced products to the customer.

Product Warranty

The Company provides a standard one-year warranty for the products it sells. The Company accrues for estimated warranty costs at the time revenue is recognized. The Company's warranty obligation is affected by product failure rates, labor and material costs for replacing defective parts, related freight costs for failed parts and other quality assurance costs. The Company monitors its product returns for warranty claims and maintains warranty reserves based on historical experiences and anticipated warranty claims known at the time of estimation.

Shipping and Handling Costs

Shipping and handling costs are included in cost of goods sold.

Research and Development

Research and development costs are expensed as incurred.

Provision for Income Taxes

Income tax expense or benefit is based on income or loss before taxes. Deferred tax assets and liabilities are recognized principally for the expected tax consequences of temporary differences between the tax basis of assets and liabilities and their reported amounts.

The Company is subject to income taxes in a number of jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. The Company establishes accruals for certain tax contingencies based on estimates of whether additional taxes may be due. While the final tax outcome of these matters may differ from the amounts that were initially recorded, such differences will impact the income tax and deferred tax provisions in the period in which such determination is made.

Significant management judgment is also required in determining whether deferred tax assets will be realized in full or in part. When it is more likely than not that all or some portion of specific deferred tax assets such as net operating losses or research and experimentation tax credit carryforwards will not be realized, a valuation allowance must be established for the amount of the deferred tax assets that cannot be realized. We consider all available positive and negative evidence on a jurisdiction-by-jurisdiction basis when assessing whether it is more likely than not that deferred tax assets are recoverable. We consider evidence such as our past operating results, the existence of cumulative losses in recent years and our forecast of future taxable income.

The Financial Accounting Standards Board, or FASB, issued guidance which clarifies the accounting for income taxes by prescribing a minimum probability threshold that a tax position must meet before a financial statement benefit is recognized. The minimum threshold is defined as a tax position that is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The tax benefit to be recognized is measured as the largest amount of benefit that is greater than fifty percent likely to be realized upon ultimate settlement. Although the guidance on the accounting for uncertainty in income taxes prescribes the use of a recognition and measurement model, the determination of whether an uncertain tax position has met those thresholds will continue to require significant judgment by management. If the ultimate resolution of tax uncertainties is different from what is currently estimated, a material impact on income tax expense could result.

Our provision for income taxes is subject to volatility and could be adversely impacted by changes in earnings or tax laws and regulations in various jurisdictions. We are subject to the continuous examination of our income tax returns by the Internal Revenue Service and other tax authorities. We regularly assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. To the extent that the final tax outcome of these matters is different from the amounts recorded, such differences will impact the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the impact of changes to reserves, as well as the related net interest and penalties.

Share-based Compensation Expense

The Company recognizes expense related to share-based compensation awards that are ultimately expected to vest based on estimated fair values on the date of grant using the Black-Scholes option valuation model. Share-based compensation expense is recognized on the accelerated vesting attribution basis over the requisite service period of the award, which generally equals the vesting period.

The Company maintains an equity-settled, share-based compensation plan which grants share options and restricted share units (the "RSUs") to employees, directors and consultants. In May 2010, the Company adopted the Employee Share Purchase Plan (the "ESPP"). The fair value of RSUs is based on the fair value of the Company's common share on the date of grant. The fair values of stock options and common stock issued under the ESPP are determined at the date of grant using the Black-Scholes option valuation model.

The Company determined the weighted average valuation assumptions as follows:

• Expected term is determined by using the historical data of industry peers as adjusted for expected changes in future exercise patterns. Starting July 2016, expected term will be estimated using the Company’s historical exercise behavior and expected future exercise behavior.

• Forfeiture rate is estimated based on the historical average period of time that the awards were outstanding and forfeited. The estimate of forfeitures is adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from the prior estimates. Changes in estimated forfeitures are recognized in the period of change and impact the amount of stock compensation expenses to be recognized in future periods, which could be material if actual results differ significantly from our estimates.

• Volatility is estimated based on combining both the Company's historical volatility and the volatility of industry peers over a period equivalent to the expected term of the stock awards granted. Starting July 2016, the Company's publicly traded shares history will be solely used in estimating the volatility rate.

• Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the awards granted.

• Dividend yield is zero as the Company has never declared or paid any dividends and currently has no intention to pay dividends in the foreseeable future.

Advertising

Advertising expenditures are expensed as incurred. Advertising expense was $0.4 million, $0.5 million, and $0.3 million for the fiscal years ended June 30, 2016, 2015, and 2014, respectively.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments.

Leases

Leases entered into by the Company as a lessee are classified as capital or operating leases. Leases that transfer to the Company substantially the entire risks and benefits incidental to ownership are classified as capital leases. At the inception of a capital lease, an asset and an obligation are recorded at an amount equal to the lesser of the present value of the minimum lease payments and the asset’s fair market value at the beginning of each lease. Rental payments under operating leases are expensed as incurred.

Risks and Uncertainties

The Company is subject to certain risks and uncertainties. The Company believes changes in any of the following areas could have a material adverse effect on the Company's future financial position or results of operations or cash flows: new product development, including market receptiveness, operation of in-house manufacturing facilities, litigation or claims against the Company based on intellectual property, patent, product regulatory or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees, the ability to successfully operate joint venture and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures and cyclical market patterns. The Company's financial results are affected by a wide variety of factors, including general economic conditions specific to the semiconductor industry and the Company's particular market, such as the personal computing (PC) markets, the timely implementation of new products, new manufacturing process technology and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in operating results due to the factors mentioned above or other factors.

The Company transitioned from a fabless to a “fab-lite” business model by completing the acquisition of the Oregon fab on January 31, 2012. Under this model, the Company allocates its wafer manufacturing requirements to both in-house capacity and selected third-party foundries. The Company also deploys and implements its proprietary power discrete processes and equipment at third-party foundries to maximize the performance and quality of its products.

The Company's revenue may be impacted by its ability to obtain adequate wafer supplies from third-party foundries and utilize wafer production and packaging and testing capacity from its in-house facilities. Currently the Company's main third-party foundry is Shanghai Hua Hong Grace Electronic Company Limited, or HHGrace, located in Shanghai, China. HHGrace has been manufacturing wafers for the Company since 2002. HHGrace manufactured ­25.0% and 25.0% of the wafers used in the Company's products for the fiscal year ended June 30, 2016 and 2015, respectively. Although the Company believes that its volume of production allows the Company to secure favorable pricing and priority in allocation of capacity in its third-party foundries, if the foundries' capacities are constrained due to market demands, HHGrace, together with other foundries from which the Company purchases wafers, may not be willing or able to satisfy all of the Company's manufacturing requirements on a timely basis and/or at favorable prices. The Company is also subject to the risks of service disruptions and raw material shortages by its foundries. Such disruptions, shortages and price increases could harm the Company's operating results. In addition, manufacturing facilities' capacity affects the Company's gross margin because the Company has certain fixed costs associated with its Oregon fab and in-house packaging and testing facilities. If the Company fails to utilize its manufacturing facilities' capacity at a desirable level, its financial condition and results of operations will be adversely effected.

Recent Accounting Pronouncements

In May 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-12, "Revenue from Contracts with Customers (Topic 606) - Narrow-Scope Improvements and Practical Expedients." ASU 2016-12 provides additional guidance established by the FASB-IASB Joint Transition Resource Group for Revenue Recognition regarding the implementation of certain aspects of the new revenue recognition guidance. More specifically, the amendment provides additional guidance regarding assessing the collectibility criterion, the presentation of sales taxes and other similar taxes collected from customers, noncash consideration, contract modifications or completed contracts at transition of the new revenue recognition guidance and technical corrections. The effective date is consistent with the effective date of ASU 2014-09. The Company is currently evaluating the impact the adoption of ASU 2016-12 will have on its consolidated financial statements.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"). ASU 2016-10 clarify two aspects of Topic 606: (a) identifying performance obligations; and (b) the licensing implementation guidance. The update is effective for annual periods beginning after December 15, 2017 including interim reporting periods therein. The Company is currently evaluating the impact the adoption of ASU 2016-10 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of related amounts within the statement of cash flows. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2016, the FASB issued No. 2016-02, Leases ("ASU 2016-02"). This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In July 2015, the FASB issued No. 2015-11, Inventory - Simplifying the Measurement of Inventory ("ASU 2015-11"). ASU 2015-11 is additional guidance regarding the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value. This guidance is effective for fiscal years and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In April 2015, the FASB issued ASU No. 2015-03, Interest -Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts and the accounting for debt issue costs under IFRS. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. ASU 2015-03 is effective for the annual period beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments in this Update is permitted for financial statements that have not been previously issued. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2015, the FASB issued ASU No. 2015-2, “Consolidation (Topic 820): Amendments to the Consolidation Analysis.” ASU 2015-2 provides a revised consolidation model for all reporting entities to use in evaluating whether they should consolidate certain legal entities. All legal entities will be subject to reevaluation under this revised consolidation model. The revised consolidation model, among other things, (i) modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities, (ii) eliminates the presumption that a general partner should consolidate a limited partnership, and (iii) modifies the consolidation analysis of reporting entities that are involved with VIEs through fee arrangements and related party relationships. ASU 2015-2 is effective for fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In August 2014, the FASB issued amended standards No. 2014-15, Presentation of Financial Statements - Going Concern ("ASU 2014-15"), to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures requirement. The amendments (1) provide a definition of the term substantial doubt, (2) require an evaluation for each annual and interim reporting period, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is not alleviated, and (6) require an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. In August 2015, the FASB issued an accounting standard update for a one-year deferral of the effective date of ASU 2014-09 to annual and interim periods beginning after December 15, 2017 and permits entities to early adopt the standard of ASU 2014-09 for annual and interim reporting periods beginning after December 15, 2016. Companies are permitted to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

Impact of Recent Accounting Pronouncements Adoption

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which eliminates the requirement for companies to present deferred tax liabilities and assets as current and non-current in a classified balance sheet. Instead, upon adoption, companies are required to classify all deferred tax assets and liabilities as non-current. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 and has made the necessary conforming reclassifications to the accompanying June 30, 2016 consolidated balance sheet and related footnote disclosures. The application of the provisions of ASU 2015-17 resulted in a $2.2 million reduction in current deferred tax assets, a $1.5 million increase in long-term deferred income tax assets and a $0.7 million reduction in non-current deferred income tax liabilities at June 30, 2015.

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Net Income (Loss) Per Share

12 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (loss) Per Common Share Attributable to Alpha and Omega Semiconductor Limited

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding, plus potential shares of common stock during the period. Potential shares of common stock include dilutive shares attributable to the assumed exercise of share options, ESPP shares and vesting of RSUs using the treasury stock method and contingent issuances of common shares related to convertible preferred shares, if dilutive. Under the treasury stock method, potential common shares outstanding are not included in the computation of diluted net income per share if their effect is anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share attributable to common shareholders:

	Year Ended June 30,
	2016			2015			2014
	(in thousands, except per share data)
Numerator:
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)
Denominator:
Basic:
Weighted average number of common shares used to compute basic net loss per share	22,452			26,429			25,952
Diluted:
Weighted average number of common shares used to compute diluted net loss per share	22,452			26,429			25,952
Net loss per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	(0.13	)	$	(0.29	)	$	(0.12	)
Diluted	$	(0.13	)	$	(0.29	)	$	(0.12	)

The following potential dilutive securities were excluded from the computation of diluted net loss per share as their effect would have been anti-dilutive:

	Year Ended June 30,
	2016	2015	2014
	(in thousands)
Employee stock options and RSUs	3,206	3,737	3,940
ESPP	414	380	601
Total potential dilutive securities	3,620	4,117	4,541

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Balance Sheet Components

12 Months Ended

Jun. 30, 2016

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Balance Sheet Components

Accounts receivable

	June 30,
	2016			2015
	(in thousands)
Accounts receivable	$	43,324		$	58,249
Less: Allowance for price adjustments	(16,700		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	26,594		$	38,781

Inventories

	June 30,
	2016		2015
	(in thousands)
Raw materials	$	23,982	$	19,423
Work in-process	32,446		31,269
Finished goods	12,420		13,483
	$	68,848	$	64,175

Property, plant and equipment, net

	June 30,
	2016			2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,323			4,243
Manufacturing machinery and equipment	193,164			172,467
Equipment and tooling	12,289			11,261
Computer equipment and software	23,448			20,602
Office furniture and equipment	1,822			1,762
Leasehold improvements	28,660			27,568
	268,583			242,780
Less accumulated depreciation	(168,687		)	(141,883		)
	99,896			100,897
Equipment and construction in progress	16,188			18,682
Property, plant and equipment, net	$	116,084		$	119,579

Total depreciation expense was $27.3 million, $27.4 million and $27.5 million for fiscal year 2016, 2015 and 2014, respectively.

The gross amount of computer software recorded under capital leases was $8.3 million and $5.8 million and the related accumulated depreciation was $5.6 million and $4.5 million, respectively, at June 30, 2016 and 2015.

The Company capitalized $0.2 million, $1.0 million and $1.1 million of software development costs for fiscal year 2016, 2015 and 2014, respectively. Amortization of capitalized software development costs was $0.6 million, $0.5 million and $0.4 million for fiscal year 2016, 2015 and 2014, respectively. Unamortized capitalized software development costs at June 30, 2016 and 2015 were $1.4 million and $1.8 million, respectively.

Impairment of long-lived assets, intangible assets, and goodwill

The Company re-evaluates its long-lived assets, intangible assets and goodwill for impairment during the fourth quarter of every fiscal year. During the fiscal year of 2016, the Company identified certain manufacturing equipments purchased for projects that were subsequently canceled. Because the equipments had no alternative uses, the Company recorded an asset impairment expense of approximately of $0.4 million related to these equipments. There was no impairment of long-lived assets for the fiscal year of 2015 and 2014. Also there was no indication of intangible assets and goodwill impairment for the fiscal year of 2016, 2015 and 2014.

Other long-term assets

	June 30,
	2016		2015
	(in thousands)
Prepayments for property and equipment	$	548	$	692
Investment in a privately held company	100		100
Office leases deposits	1,427		1,215
Other	—		4
Intangible assets	15		17
Goodwill	269		269
	$	2,359	$	2,297

Intangible assets

	June 30,
	2016			2015
	(in thousands)
Patents and exclusive technology rights	$	1,248		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	2,666			2,666
Less accumulated amortization	(2,651		)	(2,649		)
Intangible assets, net	$	15		$	17

Amortization expense for intangible assets was $2,000, $0.1 million and $0.4 million for the years ended June 30, 2016, 2015 and 2014, respectively.

Future minimum amortization expense of intangible assets is as follows (in thousand):

Year ending June 30,
2017	$	2
2018	2
2019	2
2020	2
2021	2
Thereafter	5
	$	15

Goodwill

The changes in the carrying value of goodwill is as follows (in thousands):

	(in thousands)
Balance at June 30, 2014	$	269
Addition:	—
Balance at June 30, 2015	269
Addition:	—
Balance at June 30, 2016	$	269

Accrued liabilities

	June 30,
	2016		2015
	(in thousands)
Accrued compensation and benefits	$	10,211	$	8,582
Warranty accrual	1,495		1,957
Stock rotation accrual	1,988		1,894
Accrued professional fees	1,867		1,402
Accrued inventory	918		697
Accrued facilities related expenses	1,544		1,367
Other accrued expenses	4,567		3,326
	$	22,590	$	19,225

The activity in the warranty accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346		$	1,428
Addition	881			2,395			1,267
Utilization	(1,343		)	(1,784		)	(1,349		)
Ending balance	$	1,495		$	1,957		$	1,346

The activity in the stock rotation accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645		$	1,572
Addition	6,578			5,781			5,006
Utilization	(6,484		)	(5,532		)	(4,933		)
Ending balance	$	1,988		$	1,894		$	1,645

Deferred margin

Deferred margin consists of the following:

	June 30,
	2016			2015
	(in thousands)
Deferred revenue	$	1,494		$	1,104
Deferred costs	(497		)	(388		)
Deferred margin	$	997		$	716

Capital leases

Long-term capital leases were included in the other long term liabilities in the consolidated balance sheets. Capital lease liabilities as of June 30, 2016 and 2015 consisted of the following:

	June 30,
	2016			2015
	(in thousands)
Computer software	$	2,449		$	923
Exclusive technology rights	65			82
	2,514			1,005
Less current portion	(819		)	(941		)
Capital leases - long-term portion	$	1,695		$	64

The computer software and exclusive technology rights under capital leases were included in property, plant and equipment and intangible assets, respectively.

Future minimum lease payments at June 30, 2016 are as follows (in thousand):

Year ending June 30,
2017	$	892
2018	892
2019	892
Total minimum lease payments	2,676
Less amount representing interest	(162		)
Total capital lease liabilities	$	2,514

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Concentration of Credit Risk and Significant Customers

12 Months Ended

Jun. 30, 2016

Risks and Uncertainties [Abstract]

Concentration of Credit Risk and Significant Customers

Concentration of Credit Risk and Significant Customers

The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers.

Credit sales, which are mainly on credit terms of 30 to 60 days, are only made to customers who meet the Company's credit standards, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its financial assets to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant bad debt write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, where available.

Summarized below are individual customers whose revenue or accounts receivable balances were 10% or higher than the respective total consolidated amounts:

	Year Ended June 30,
Percentage of revenue	2016		2015		2014
Customer A	23.8	%	25.4	%	21.6	%
Customer B	37.2	%	36.1	%	43.1	%
Customer C	12.3	%	11.7	%	11.6	%

	June 30,
Percentage of accounts receivable	2016		2015
Customer A	21.3	%	29.4	%
Customer B	16.7	%	27.7	%
Customer C	27.2	%	14.7	%

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Debt

12 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Debt

Debt

On May 11, 2012, the Company entered into a loan agreement with a financial institution that provided a term loan of $20.0 million for general purposes and a $10.0 million non-revolving credit line for the purchase of equipment. Both the term loan and equipment credit line were fully repayable in May 2015. The borrowings could have been made in the form of either Eurodollar loans or Base Rate loans. Eurodollar loans accrued interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the agreement, plus a margin of 1.00% to 1.75%. Base Rate loans accrued interest at the highest of (a) the lender's Prime Rate, (b) the Federal Funds Rate plus 0.5% and (c) the Eurodollar Rate (for a one-month interest period) plus 1%; plus a margin of -0.5% to 0.25%. The applicable margins for both Eurodollar loans and Base Rate loans varied from time to time in the foregoing ranges based on the cash and cash equivalent balances maintained by the Company and its subsidiaries with the lender. In May 2013, the equipment credit line expired and there was no outstanding balance. In May 2015, the Company repaid the term loan in full.

During July 2012, the Company entered into a loan agreement with the State of Oregon for an amount of $0.3 million. The loan was required to be used for training new and re-training existing employees of the Oregon fab. The loan bore a compound annual interest rate of 5.0% and was to be repaid in April 2014 if the required conditions were not met. In September 2014, the State of Oregon forgave the outstanding balance in full as the Company had satisfied the conditions. The $0.3 million loan forgiven was recorded as a reduction of costs of goods sold in our condensed consolidated statements of operations.

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Joint Venture (Notes)

12 Months Ended

Jun. 30, 2016

Equity Method Investments and Joint Ventures [Abstract]

Joint Ventures

6. Joint Venture

On March 29, 2016, the Company entered into a joint venture contract (the “JV Agreement”) with two investment funds affiliated with the municipalities of Chongqing (the “Chongqing Funds”), pursuant to which the Company and Chongqing Funds form a joint venture, (the “JV Company”), for the purpose of constructing a power semiconductor packaging, testing and 12-inch wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which includes cash contribution from the Chongqing funds and contributions of cash, equipments and intangible assets from the Company.  The Initial Capitalization will be completed in stages commencing on the incorporation of the JV Company.  The Company owns 51%, and the Chongqing Funds owns 49%, of the equity interest in the JV Company. The Company expects the JV company to commence its initial production in the first half of fiscal 2018.

The Company began consolidating the expenses of the JV Company during the quarter ended June 30, 2016. The Company and the Chongqing Funds did not make any capital contributions to the JV Company as of June 30, 2016. Within one year from June 30, 2016, the Company is expected to contribute certain intangible assets, a portion of the packaging equipments currently being used in the Company's Shanghai facility, and cash of $10.0 million pursuant to the terms of the JV agreement. In July 2016, the Chongqing Funds contributed $33.0 million initial capital to the JV Company.

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Shareholders' Equity

12 Months Ended

Jun. 30, 2016

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders' Equity

Common Shares

The Company's bye-laws, as amended, authorized the Company to issue 50,000,000 common shares with par value of $0.002. Each common share is entitled to one vote. The holders of common shares are also entitled to receive dividends whenever funds are legally available and when and if declared by the board of directors, subject to the prior rights of holders of all classes of shares outstanding. No dividends had been declared as of June 30, 2016.

On October 22, 2010, the Company's board of directors authorized a $25.0 million share repurchase program. Under this repurchase program the Company was authorized to repurchase shares from the open market or in privately negotiated transactions, from time to time, subject to supervision and oversight by the board. The Company accounts for treasury stock under the cost method. Shares repurchased are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. From time to time, treasury shares may be reissued as part of the Company's stock-based compensation programs. Gains on re-issuance of treasury stock are credited to additional paid-in capital; losses are charged to additional paid-in capital to offset the net gains, if any, from previous sales or re-issuance of treasury stock. Any remaining balance of the losses are charged to retained earnings. On May 8, 2014, the Company's Board of Directors approved to reactivate the share repurchase program with a remaining balance of $22.7 million. In April 2015, the Board of Directors approved an increase in the remaining available amount under the Company’s share repurchase program from approximately $17.8 million to $50.0 million.

In June 2015, the Company commenced a modified Dutch auction tender offer (the "Tender Offer") to repurchase an aggregate of $30.0 million of its outstanding common shares with a price range between $8.50 and $9.20 per share. In July 2015, the Company completed the Tender Offer in which it purchased 3,296,703 shares of its common shares, at a purchase price of $9.10 per share, for an aggregate purchase price of $30.0 million, excluding fees and expenses relating to the Tender Offer. These shares represent approximately 12.53% of the total number of the Company's common shares issued and outstanding as of June 30, 2015. The Tender Offer was part of the $50.0 million share repurchase program approved by the Board in April 15, 2015. Immediately following the completion of the Tender Offer, approximately $18.2 million remained available under the share repurchase program.

During fiscal years 2016, 2015 and 2014, the Company repurchased an aggregate of 4,695,499 shares, 666,230 shares and 119,594 shares, respectively, from the open market for a total cost of approximately $41.8 million, $5.8 million and $0.9 million, excluding fees and related expenses, at an average price of $8.90, $8.70 and $7.66 per share, respectively.

As of June 30, 2016, the Company had repurchased an aggregate of 5,723,093 shares for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses, since inception of the program. No repurchased shares have been retired. Of the 5,723,093 repurchased shares, 71,803 shares with a weighted average repurchase price of $12.33 per share, were reissued at an average price of $4.28 per share for option exercises and vested restricted stock units ("RSU"). As of June 30, 2016, $6.4 million remain available under the share repurchase program.

Convertible Preferred Shares

On May 4, 2010, concurrent with the closing of the Company's initial public offering, all of the Company's outstanding preferred shares including 5,050,000 Series A convertible preferred shares, 2,488,094 Series B convertible preferred shares and 3,174,000 Series C convertible preferred shares, were automatically converted into 10,712,094 shares of common shares and the then-existing classes of preferred stock ceased to exist. At June 30, 2016 and 2015, the Company had no preferred shares outstanding and had 10,000,000 authorized undesignated preferred shares.

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Share-based Compensation

12 Months Ended

Jun. 30, 2016

Share-based Compensation [Abstract]

Share-based Compensation

Share-based Compensation

2000 Share Plan

The 2000 Share Plan (the “2000 Plan”), as amended, authorized the board of directors to grant incentive share options and non-statutory share options to employees, directors and consultants of the Company and its subsidiaries for up to 5,425,000 common shares. Under the 2000 Plan, incentive share options and non-statutory share options were to be granted at a price that was not less than 100% and 85% of the fair value of the common share at the date of grant for employees and consultants, respectively. Options generally vest over a five-year period, 20% on the first anniversary from the grant date and ratably each month over the remaining 48-month period, and are exercisable for a maximum period of ten years after the date of grant. Incentive share options granted to shareholders who own more than 10% of the outstanding shares of all classes of shares of the Company at the time of grant must be issued at an exercise price not less than 110% of the fair value of the common shares on the date of grant. In connection with the adoption of the 2009 Share Option/Share Issuance Plan on September 18, 2009, the 2000 Share Plan was terminated and no further awards were granted under the 2000 Share Plan.

2009 Share Option/Share Issuance Plan

The 2009 Share Option/Share Issuance Plan (the “2009 Plan”), as approved in September 2009 at the annual general meeting of shareholders, and as amended and restated in connection with the Company's IPO, authorized the board of directors to grant incentive share options, non-statutory share options and restricted shares to employees, directors, and consultants of the Company and its subsidiaries for up to 1,250,000 common shares. The number of common shares available for issuance under the 2009 Plan shall automatically increase in January each calendar year during the term of the 2009 Plan, beginning with calendar year 2011, by the lesser of 3% of the total number of common shares outstanding or 750,000 shares. This increase was 668,915 shares, 750,000 shares and 750,000 shares for the years ended June 30, 2016, 2015 and 2014, respectively. As of June 30, 2016, 2,527,000 shares were available for grant under the 2009 Plan.

The 2009 Plan is divided into three incentive compensation programs: Discretionary Grant Program, Share Issuance Program and Automatic Grant Program. Under the Discretionary Grant Program, eligible individuals may be granted options to purchase common shares and share appreciation rights tied to the value of the Company's common shares. Under the Share Issuance Program, eligible individuals may be issued common shares pursuant to restricted share awards, restricted share units, performance shares or other share-based awards which vest upon the attainment of pre-established performance milestones or the completion of a designated service period. Under the Automatic Grant Program, eligible non-employee board members will automatically receive options to purchase common shares at designated intervals over their period of continued board service. Each non-employee board members was granted an option to purchase 7,500 common shares on April 28, 2010 with exercise price equal to the IPO price. On the date of each annual shareholders meeting beginning in 2010 and ending in 2013, each individual who commence service as a non-employee board member by reason of his or her election to the board at such meeting and each individual who continues to serve as a non-employee board member was automatically granted an option to purchase 7,500 common shares. Beginning with the 2014 Annual Shareholders Meeting, on the date of each annual shareholders meeting, each individual who commences service as a non-employee Board member by reason of his or her election to the Board at such annual meeting and each individual who is to continue to serve as a non-employee Board member, whether or not that individual is standing for re-election to the Board at that particular annual meeting, will automatically be granted an award in the form of restricted share units ("RSU") covering that number of common shares determined by dividing forty-two thousand dollars ($42,000) by the average fair market value per share for the ninety (90)-day period preceding the grant date (the “Annual RSU Grant”).

Under the 2009 Plan, incentive share options and RSU are to be granted at a price that is not less than 100% and nonstatutory share options are to be granted not less than 85% of the fair value of the common shares, at the date of grant for employees and consultants. Options and RSUs generally vest over a four-year to five-year period, and are exercisable for a maximum period of ten years after the date of grant. Incentive share options granted to shareholders who own more than 10% of the outstanding shares of all classes of shares of the Company at the time of grant must be issued at an exercise price not less than 110% of the fair value of the common shares on the date of grant.

A summary of the stock option activities under the 2000 Plan and 2009 Plan is as follows:

					Weighted		Weighted
			Weighted		Average		Average
			Average		Grant Date		Remaining
	Number of		Exercise Price		Fair Value		Contractual	Aggregate
	Shares		Per Share		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2013	3,593,854		$	10.24			5.46
Granted	764,375		$	7.49	$	3.85
Exercised	(421,456	)	$	2.60				$	2,222,155
Canceled or forfeited	(697,989	)	$	11.65
Outstanding at June 30, 2014	3,238,784		$	10.28			5.79
Granted	10,000		$	9.07	$	4.42
Exercised	(269,861	)	$	5.22				$	1,088,061
Canceled or forfeited	(142,706	)	$	10.08
Outstanding at June 30, 2015	2,836,217		$	10.77			4.64
Granted	—		$	—	$	—
Exercised	(666,445	)	$	8.36				$	1,746,173
Canceled or forfeited	(310,512	)	$	12.34
Outstanding at June 30, 2016	1,859,260		$	11.37			4.71	$	5,959,720
Options vested and expected to vest	1,840,261		$	11.41			4.68	$	5,839,323
Exercisable at June 30, 2016	1,595,992		$	12.00			4.22	$	4,296,568

The aggregate intrinsic value for options outstanding at June 30, 2016 in the table above is based on the Company’s common stock closing price on June 30, 2016.

Information with respect to stock options outstanding and exercisable as of June 30, 2016 is as follows:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-Average Remaining Contractual Life  (Years)	Weighted-Average Exercise Price		Number Exercisable	Weighted-Average Exercise Price
$7.21 - $7.21	6,875	7.58	$	7.21	6,875	$	7.21
$7.44 - $7.44	436,147	7.71	$	7.44	226,146	$	7.44
$7.47 - $9.90	399,788	5.71	$	8.84	346,521	$	8.92
$10.22 - $13.00	646,450	2.55	$	12.31	646,450	$	12.31
$14.14 - $18.00	370,000	3.81	$	17.20	370,000	$	17.20
$7.21 - $18.00	1,859,260	4.71	$	11.37	1,595,992	$	12.00

The Company did not grant any stock options during the year ended June 30, 2016. The fair value of stock options granted during the years ended June 30, 2015 and 2014 were estimated at the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions:

	Year Ended June 30,
	2016	2015	2014
Volatility rate	—%	40.9% - 43.5%	46.9% - 49.2%
Risk-free interest rate	—%	1.6% - 1.8%	1.0% - 1.7%
Expected option life	—	5.5 years	5.5 years
Dividend yield	—%	—%	—%

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share			Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2013	549,553			$	9.50	1.87	$	4,198,585
Granted	368,554			$	7.54
Vested	(136,581	)		$	9.46
Forfeited	(125,152	)		$	9.54
Nonvested at June 30, 2014	656,374			$	8.40	1.77	$	6,084,587
Granted	493,622			$	8.92
Vested	(213,180	)		$	8.65
Forfeited	(62,870	)		$	8.35
Nonvested at June 30, 2015	873,946			$	8.64	1.77	$	7,638,288
Granted	466,255			$	11.28
Vested	(301,695	)		$	10.97
Forfeited	(105,443	)		$	8.85
Nonvested at June 30, 2016	933,063			$	9.18	1.73	$	12,997,568

Employee Share Purchase Plan

The Employee Share Purchase Plan (“Purchase Plan” or “ESPP”) was established in May 2010 upon the completion of the Company's IPO. The Purchase Plan provided for a series of overlapping offering periods with a duration of 24 months, with new offering periods, generally beginning on May 15 and November 15 of each year. The Purchase Plan allows employees to purchase common shares through payroll deductions of up to 15% of their eligible compensation. Such deductions will accumulate over a six-month accumulation period without interest. After such accumulation period, common shares will be purchased at a price equal to 85% of the fair market value per share on either the first day of the offering period or the last date of the accumulation period, whichever is less. The maximum number of shares that may be purchased on any purchase date may not exceed 875 shares for a total of 3,500 shares per a 24-month offering period. In addition, no participant may purchase more than $25,000 worth of common stock in any one calendar year period.

The Company initially reserved 600,000 common shares for issuance under the ESPP. The share reserve will automatically increase in January of each calendar year during the term of the ESPP, beginning with calendar year 2011, by the lesser of 0.75% of the outstanding common shares or 250,000 shares. This increase was 167,229 shares, 192,000 shares and 192,000 shares for the years ended June 30, 2016, 2015 and 2014, respectively.

The ESPP is compensatory and results in compensation expense. The fair values of common shares to be issued under the ESPP were determined using the Black-Scholes option valuation model with the following assumptions:

	Year Ended June 30,
	2016	2015	2014
Volatility rate	32.2% - 34.8%	31.4% - 50.0%	50.0%
Risk-free interest rate	0.3% - 0.9%	0.1% - 0.6%	0.1% - 0.4%
Expected term	1.3 years	1.3 years	1.3 years
Dividend yield	—%	—%	—%

The weighted-average estimated fair value of employee stock purchase rights granted pursuant to the ESPP during the years ended June 30, 2016, 2015 and 2014 was $2.85, $2.80 and $2.89 per share, respectively.

Share-based Compensation Expenses

The total share-based compensation expense related to stock options, ESPP and RSUs described above, recognized in the consolidated statements of operations for the years presented was as follows:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Cost of goods sold	$	636	$	669	$	614
Research and development	1,115		779		786
Selling, general and administrative	2,562		3,042		1,975
	$	4,313	$	4,490	$	3,375

Total unrecognized share-based compensation expense as of June 30, 2016 was $5.8 million including estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.6 years.

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Employee Benefit Plans

12 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

The Company maintains a 401(k) retirement plan for the benefit of qualified employees in the U.S.. Employees who participate may elect to make salary deferral contributions to the plan up to 100% of the employees' eligible salary subject to annual Internal Revenue Code maximum limitations. The employer's contribution is discretionary. The Company had not made any contributions for eligible employees as of June 30, 2016.

The Company makes mandatory contributions for its employees to the respective local governments in terms of retirement, medical insurance and unemployment insurance, where applicable, according to labor and social security laws and regulations of the countries and areas in which the Company operates. The contribution rates for retirement are 7.7%, 13.0% to 20.0% and 6.0% for employees in the U.S., China and Taiwan, respectively. The Company has no obligations for the payment of such social benefits beyond the required contributions as set out above.

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Income Taxes

12 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The provision for income taxes is comprised of:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. federal taxes:
Current	$	152		$	66		$	(65	)
Deferred	650			852			1,144
Non-U.S. taxes:
Current	3,382			3,059			2,316
Deferred	(169		)	(15		)	(608		)
State taxes, net of federal benefit:
Current	6			(65		)	(38		)
Deferred	—			—			20
Total provision for income taxes	$	4,021		$	3,897		$	2,769

The reconciliation of the federal statutory income tax rate to our effective income tax rate is as follows (in percentage):

	Year Ended June 30,
	2016		2015		2014
United States statutory rate	34.0	%	34.0	%	34.0	%
State taxes, net of federal benefit	0.4		1.2		2
Stock based compensation	(0.4	)	0.4		3.2
Foreign taxes, net	440.3		(145.7	)	(900.2	)
Research and development credit	(69.3	)	10		45.4
Non-deductible expenses	1.7		(0.7	)	(8.7	)
Other	(0.1	)	—		(2.3	)
	406.6	%	(100.8	)%	(826.6	)%

The domestic and foreign components of income (loss) before taxes are:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. operations	$	4,259		$	4,614		$	4,184
Non-U.S. operations	(3,270		)	(8,480		)	(4,519		)
Income (loss) before income taxes	$	989		$	(3,866	)	$	(335	)

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities are as follows:

	June 30,
	2016			2015
	(in thousands)
Deferred tax assets:
Accrued compensation	$	2,267		$	1,915
Net operating loss carryforwards	67			81
Depreciation	10,345			11,079
Tax credits	6,069			5,171
Accruals and reserves	934			658
Total deferred tax assets	19,682			18,904
Valuation allowance	(2,894		)	(2,700		)
Total deferred tax assets, net of valuation allowance	16,788			16,204
Deferred tax liabilities:
Depreciation and amortization	(7,388		)	(5,651		)
Accruals and reserves	(241		)	(523		)
Total deferred tax liabilities	(7,629		)	(6,174		)
Net deferred tax assets	$	9,159		$	10,030

The breakdown between current and non-current deferred tax assets and liabilities is as follows:

	June 30,
	2016			2015
	(in thousands)
Long-term deferred tax assets	$	12,132		$	12,340
Long-term deferred tax liabilities	(2,973		)	(2,310		)
Net deferred tax assets	$	9,159		$	10,030

At June 30, 2016 and 2015, the Company provided a valuation allowance for its state research and development credit carryforward deferred tax assets, as it generated more state tax credits each year than it can utilize. The Company intends to maintain a partial valuation allowance equal to the state research and development credit carryfowards until sufficient positive evidence exists to support reversal of the valuation allowance.

At June 30, 2016, the Company had federal tax credit carryforwards of approximately $3.0 million. The federal tax credits begin to expire in 2029, if not utilized. At June 30, 2016, the Company had no state net operating loss carryforwards and had tax credit carryforwards of approximately $4.6 million.  Approximately $0.2 million of the state tax credits begin to expire in 2018, if not utilized. The remaining $4.4 million of the state tax credits carryforward indefinitely.

The Company has not provided for withholding taxes on the undistributed earnings of its foreign subsidiaries because it intends to reinvest such earnings indefinitely. As of June 30, 2016, the cumulative amount of undistributed earnings of its foreign entities considered permanently reinvested is $82.2 million. The determination of the unrecognized deferred tax liability on these earnings is not practicable. Should the Company decide to remit this income to its Bermuda parent company in a future period, its provision for income taxes may increase materially in that period.

At June 30, 2016, the Company had approximately $6.7 million in total unrecognized tax benefits. A reconciliation of the beginning and ending amount of unrecognized tax benefits from July 1, 2014 to June 30, 2016 is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Balance at beginning of year	$	6,412		$	6,760		$	7,668
Additions based on tax positions related to the current year	388			297			329
Additions (reductions) based on tax positions related to prior years	—			4			(18		)
Reductions due to lapse of applicable statute of limitations	(57		)	(649		)	(1,219		)
Balance at end of year	$	6,743		$	6,412		$	6,760

At June 30, 2016, the total unrecognized tax benefits of $6.7 million included $5.4 million of unrecognized tax benefits that have been netted against the related deferred tax assets. The remaining $1.3 million of unrecognized tax benefits was recorded within long-term income tax payable on the Company's consolidated balance sheet as of June 30, 2016.

The total unrecognized tax benefits of $6.7 million at June 30, 2016 included $4.4 million that, if recognized, would reduce the effective income tax rate in future periods. It is reasonably possible that the Company will recognize approximately $0.6 million reduction to its uncertain tax positions during the next twelve months.

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. To the extent accrued interest and penalties do not ultimately become payable, amounts accrued will be reduced and reflected as a reduction of the overall income tax provision in the period that such determination is made. The amount of interest and penalties accrued at June 30, 2016 was $0.3 million, of which $0.03 million was recognized in the year ended June 30, 2016. The amount of interest and penalties accrued at June 30, 2015 was $0.2 million, of which $(0.1) million was recognized in the year ended June 30, 2015.

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2016 remain open to examination by U.S. federal and state tax authorities. The tax years 2009 to 2016 remain open to examination by foreign tax authorities.

The Company's income tax returns are subject to examinations by the Internal Revenue Service and other tax authorities in various jurisdictions. In accordance with the guidance on the accounting for uncertainty in income taxes, the Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. If the Company's estimate of income tax liabilities proves to be less than the ultimate assessment, then a further charge to expense would be required. If events occur and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary.

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Segment and Geographic information

12 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Segment and Geographic Information

Segment and Geographic Information

The Company is organized as, and operates in, one operating segment: the design, development and supply of power semiconductor products for computing, consumer electronics, communication and industrial applications. The chief operating decision-maker is the Chief Executive Officer. The financial information presented to the Company's Chief Executive Officer is on a consolidated basis, accompanied by information about revenue by customer and geographic region, for purposes of evaluating financial performance and allocating resources. The Company has one business segment, and there are no segment managers who are held accountable for operations, operating results and plans for products or components below the consolidated unit level. Accordingly, the Company reports as a single operating segment.

The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets.

The revenue by geographical location in the following tables is based on the country or region in which the products were shipped to:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Hong Kong	$	290,555	$	277,825	$	271,728
China	37,444		42,103		38,740
South Korea	1,960		2,253		3,033
United States	3,110		2,942		1,976
Other countries	2,592		2,812		2,644
	$	335,661	$	327,935	$	318,121

The following is a summary of revenue by product type:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Power discrete	$	252,063	$	248,716	$	246,033
Power IC	69,344		63,529		53,993
Packaging and testing services	14,254		15,690		18,095
	$	335,661	$	327,935	$	318,121

Long-lived assets, consisting of property, plant and equipment by geographical area are as follows:

	June 30,
	2016		2015
	(in thousands)
China	$	64,272	$	71,618
United States	51,214		47,439
Other countries	598		522
	$	116,084	$	119,579

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Restricted Net Assets

12 Months Ended

Jun. 30, 2016

Restrictions for Consolidated and Unconsolidated Subsidiaries [Abstract]

Restricted Net Assets

Restricted Net Assets

Laws and regulations in China permit payments of dividends by the Company's subsidiaries in China only out of their retained earnings, if any, as determined in accordance with China accounting standards and regulations. Each China subsidiary is also required to set aside at least 10% of its after-tax profit, if any, based on China accounting standards each year to its statutory reserves until the cumulative amount of such reserves reaches 50% of its registered capital. As a result of these China laws and regulations, the Company's China subsidiaries are restricted in their abilities to transfer a portion of their net assets to the Company. As of June 30, 2016 and 2015, such restricted portion amounted to approximately $84.2 million and $86.8 million, or 34.8% and 31.4%, of our total consolidated net assets, respectively. As the Company's China subsidiaries are not revenue generating operating units, the Company does not expect to repatriate funds in the form of dividends, loans or advances from its China subsidiaries for working capital and other funding purposes.

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Commitments and Contingencies

12 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Operating lease obligations

The Company leases its office facilities and certain office equipment under non-cancelable operating leases that expire through 2023. Rent expense related to the Company's operating leases was $3.5 million, $3.5 million and $3.4 million for the fiscal years ended June 30, 2016, 2015 and 2014, respectively. Certain leases contain escalation clauses calling for increased rents.

Future minimum lease payments of these leases at June 30, 2016 are as follows:

Year ending June 30,	Operating Leases
	(in thousands)
2017	$	3,200
2018	2,249
2019	1,849
2020	1,484
2021	554
Thereafter	574
	$	9,910

Purchase commitments

As of June 30, 2016 and 2015, the Company had approximately $39.6 million and $29.2 million, respectively, of outstanding purchase commitments primarily for purchases of semiconductor raw materials, wafers, spare parts and packaging and testing services.

As of June 30, 2016 and 2015, the Company had approximately $6.6 million and $3.7 million, respectively, of capital commitments for the purchase of property and equipment.

Contingencies and indemnities

The Company is currently not a party to any material legal proceedings. The Company has in the past, and may from time to time in the future, becomes involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, the Company could incur significant costs in the defense thereof or could suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it contracted with various parties. Pursuant to these agreements, the Company may be obligated to indemnify another party to such an agreement with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold, certain intellectual property rights, specified environmental matters and certain income taxes. In these circumstances, payment by the Company is customarily conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other party's claim. Further, the Company's obligations under these agreements maybe limited in time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. The Company has not historically paid or recorded any material indemnifications and no accrual was made at June 30, 2016 and 2015.

The Company has agreed to indemnify its directors and certain employees as permitted by law and pursuant to its bye-laws, and has entered into indemnification agreements with its directors and executive officers. The Company has not recorded a liability associated with these indemnification arrangements, as it historically has not incurred any material costs associated with such indemnification obligations. Costs associated with such indemnification obligations may be mitigated by insurance coverage that the Company maintains, however, such insurance may not cover any, or may cover only a portion of, the amounts the Company may be required to pay. In addition, the Company may not be able to maintain such insurance coverage in the future.

Joint Venture

In March 2016, we executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

Environmental matters

The Company is subject to various federal, state, local, and foreign laws and regulations governing environmental

matters, including the use, handling, discharge, and disposal of hazardous materials. The Company believes that it has been in material compliance with applicable environmental regulations and standards. Complying with current laws and regulations has not had a material adverse effect on the Company’s financial condition and results of operations. However, it is possible that additional environmental issues may arise in the future, which the Company cannot currently predict.

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Schedule I - Condensed Unconsolidated Balance Sheets

12 Months Ended

Jun. 30, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule I - Notes to the Condensed Unconsolidated Financial Statements

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

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Schedule I - Condensed Unconsolidated Statements of Income

12 Months Ended

Jun. 30, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule I - Notes to the Condensed Unconsolidated Financial Statements

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

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Schedule I - Condensed Unconsolidated Statements of Comprehensive Income (Loss) Schedule I - Condensed Unconsolidated Statements of Comprehensive Income (Loss) (Notes)

12 Months Ended

Jun. 30, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule I - Notes to the Condensed Unconsolidated Financial Statements

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

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Schedule I - Condensed Unconsolidated Cash Flows

12 Months Ended

Jun. 30, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule I - Notes to the Condensed Unconsolidated Financial Statements

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

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Schedule I - Notes to the Condensed Unconsolidated Financial Statements

12 Months Ended

Jun. 30, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule I - Notes to the Condensed Unconsolidated Financial Statements

	Year ended June 30,
	2016			2015			2014
Net loss including noncontrolling interest	$	(3,032	)	$	(7,763	)	$	(3,104	)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(135		)	(128		)	76
Comprehensive loss	(3,167		)	(7,891		)	(3,028		)
Noncontrolling interest	(103		)	—			—
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$	(3,064	)	$	(7,891	)	$	(3,028	)

	June 30,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	8,051		$	17,397
Accounts receivable - Intercompany	13,385			39,004
Other current assets	268			291
Total current assets	21,704			56,692
Property, plant and equipments, net	1,308			1,786
Other long-term assets	100			100
Investment in subsidiaries	219,594			218,552
Total assets	$	242,706		$	277,130
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	667		$	491
Total liabilities	667			491
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57			55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199		)	(8,593		)
Additional paid-in capital	191,444			181,040
Accumulated other comprehensive income	769			905
Retained earnings	100,071			103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142			276,639
Noncontrolling interest	(103		)	—
Total equity	242,039			276,639
Total liabilities and equity	$	242,706		$	277,130

	Year Ended June 30,
	2016			2015			2014
Revenue	$	3,345		$	3,332		$	3,074
Cost of revenue	—			—			—
Gross profit	3,345			3,332			3,074
Operating expenses:
Selling, general and administrative	3,438			3,477			3,171
Total operating expenses	3,438			3,477			3,171
Operating loss	(93		)	(145		)	(97		)
Interest income	7			7			6
Interest expense	—			(2		)	(11		)
Loss on equity investment in subsidiaries	(2,946		)	(7,623		)	(3,002		)
Net loss including noncontrolling interest	(3,032		)	(7,763		)	(3,104		)
Net loss attributable to noncontrolling interest	(104		)	—			—
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)

	Year Ended June 30,
	2016			2015			2014
Cash flows from operating activities
Net loss	$	(3,032	)	$	(7,763	)	$	(3,104	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545			587			366
Share-based compensation expense	190			242			187
Equity in net loss of subsidiaries	2,946			7,623			3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620			15,664			(2,333		)
Other current assets	23			26			(124		)
Accounts payable and accrued liabilities	174			(101		)	(191		)
Net cash provided by (used in) operating activities	26,466			16,278			(2,197		)
Cash flows from investing activities
Purchase of property and equipment	(67		)	(625		)	(919		)
Net cash used in investing activities	(67		)	(625		)	(919		)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036		)	(539		)	(316		)
Proceeds from exercise of stock options and ESPP	7,371			3,007			2,675
Payment for repurchase of common shares	(42,080		)	(5,816		)	(918		)
Principal payments on capital leases	—			(95		)	(281		)
Net cash provided by (used in) financing activities	(35,745		)	(3,443		)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346		)	12,210			(1,956		)
Cash and cash equivalents at beginning of year	17,397			5,187			7,143
Cash and cash equivalents at end of year	$	8,051		$	17,397		$	5,187

1. Basis of Presentation

Alpha and Omega Semiconductor Limited is the parent company of all Alpha and Omega Semiconductor subsidiaries. It was incorporated in Bermuda on September 27, 2000 as an exempted limited liability company. The address of its registered office is Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

The accompanying condensed parent company financial statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of its subsidiaries exceed 25% of the consolidated net assets of Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”).

The parent company records its investment in subsidiaries under the equity method of accounting. Such investment is presented on the balance sheet as "Investment in subsidiaries" and the subsidiaries' net income (loss) are recognized based on the effective shareholding percentage as income on equity investment in subsidiaries on the statement of operations. Intercompany balances and transactions have not been eliminated. The revenue recorded represents intercompany administrative service fees charged by the parent company starting in fiscal year 2013.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The footnote disclosures contain supplemental information relating to the operations of the Company and, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company.

2. Restricted net assets of subsidiaries

For a discussion of the Company’s restricted net assets of subsidiaries, see Note 12 of the Company’s consolidated financial statements.

3. Commitments and contingencies

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of -the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing. The Joint Venture is expected to commence its initial production in the first half of fiscal 2018. Under the Joint Venture agreement, the Company is required to contribute $10.0 million in cash, equipments and intangible assets within one year from June 30, 2016.

For a discussion of the Company’s commitments and contingencies, see Note 13 to the Company’s consolidated financial statements.

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Jun. 30, 2016

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

	Allowance			Allowance			Allowance
	for Doubtful			for Price			for Deferred
	Accounts			Adjustments			Tax Assets
June 30, 2013	$	752		$	13,152		$	2,127
Additions	—			64,987			268
Reductions	(722		)	(63,576		)	—
June 30, 2014	30			14,563			2,395
Additions	—			87,189			305
Reductions	—			(82,314		)	—
June 30, 2015	30			19,438			2,700
Additions	—			90,967			194
Reductions	—			(93,705		)	—
June 30, 2016	$	30		$	16,700		$	2,894

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The Company and Significant Accounting Policies (Policies)

12 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Preparation

Basis of Preparation

The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and a subsidiary in which it has a controlling interest after elimination of inter-company balances and transactions. The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP").

The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has controlling financial interest.

Reclassification

Reclassification

The Company has reclassified certain amounts previously reported in its financial statements to conform to the current presentation. These reclassifications did not have a material impact on our consolidated financial statements.

Use of Estimates

Use of Estimates

The preparation of our consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Foreign Currency Transactions and Translation

Foreign Currency Transactions and Translation

Most of the Company's principal subsidiaries use U.S. dollars as their functional currency because their transactions are primarily conducted and settled in U.S. dollars. All of their revenues and a significant portion of their operating expenses are denominated in U.S. dollars. The functional currencies for the Company's in-house packaging and testing facilities in China are U.S. dollars, and a significant majority of their capital expenditures are denominated in U.S. dollars. Foreign currency transactions are translated into the functional currencies using the exchange rates prevailing at the dates of the transactions. Foreign exchange gains and losses, resulting from the settlement of such transactions and from the remeasurement of monetary assets and liabilities denominated in foreign currencies using exchange rates at balance sheet date and non-monetary assets and liabilities using historical exchange rates, are recognized in the consolidated statements of operations.

For the Company's subsidiaries which use the local currency as their functional currency, their results and financial position are translated into U.S. dollars using exchange rates at balance sheet dates for assets and liabilities and using average exchange rates for income and expenses items. The resulting translation differences are presented as a separate component of accumulated other comprehensive income (loss) and noncontrolling interest in the consolidated statements of equity.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of cash on hand and short-term bank deposits with original maturities of three months or less. Cash equivalents are highly liquid investments with stated maturities of three months or less as of the dates of purchase. The carrying amounts reported for cash and cash equivalents are considered to approximate fair values based upon their short maturities.

Cash and cash equivalents are maintained with reputable major financial institutions. If, due to current economic conditions or other factors, one or more of the financial institutions with which the Company maintains deposits fails, the Company's cash and cash equivalents may be at risk. Deposits with these banks may exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.

Accounts Receivable

Accounts Receivable

The allowance for doubtful accounts is based on assessment of the collectibility of accounts receivable from customers. The Company reviews the allowance by considering factors such as historical collection experience, credit quality, age of the accounts receivable balances and current economic conditions that may affect a customer's ability to pay. The Company writes off a receivable and charges against its recorded allowance when it has exhausted its collection efforts without success.

Fair Value Measurements

Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The fair value of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities. The carrying value of the company's debt is considered a reasonable estimate of fair value which is estimated by considering the current rates available to the Company for debt of the same remaining maturities, structure and terms of the debts.

Inventories

Inventories

The Company carries inventories at the lower of cost (determined on a first-in, first-out basis) or market value. Cost includes semiconductor wafer and raw materials, labor, depreciation expenses and other manufacturing expenses and overhead, and packaging and testing fees paid to third parties if subcontractors are used. Inventory reserves are made based on the Company's periodic review of inventory quantities on hand as compared with its sales forecasts, historical usage, aging of inventories, production yield levels and current product selling prices. If actual market conditions are less favorable than those forecasted by management, additional future inventory write-downs may be required that could adversely affect the Company's operating results. Inventory reserves once established are not reversed until the related inventory has been sold or scrapped.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. Historical cost includes expenditures that are directly attributable to the acquisition of the items and the costs incurred to make the assets ready for their intended use.

Depreciation is provided for on a straight-line basis over the estimated useful lives of the related assets as follows:

Building	20 years
Manufacturing machinery and equipment	3 to 10 years
Equipment and tooling	5 years
Computer equipment and software	3 to 5 years
Office furniture and equipment	5 years
Leasehold improvements	2 to 15 years based on shorter of expected economic useful life or the lease term

Equipment and construction in progress represent equipment received but necessary installation has not been fully performed or leasehold improvements have been started but not yet completed. Equipment and construction in progress are stated at cost and transferred to respective asset class when fully completed and ready for their intended use.

Internal-use software development costs are capitalized to the extent that the costs are directly associated with the development of identifiable and unique software products controlled by the Company that will probably generate economic benefits beyond one year. Costs incurred during the application development stage are required to be capitalized. The application development stage is characterized by software design and configuration activities, coding, testing and installation. Training costs and maintenance are expensed as incurred, while upgrades and enhancements are capitalized if it is probable that such expenditures will result in additional functionality. Costs included employee costs incurred and fees paid to outside consultants for the software development and implementation. Internal developed software is amortized over its estimated useful life of five years starting from the date when it is ready for its intended use.

Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are recognized as selling, general and administrative expenses in the consolidated statements of operations. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

Long-lived assets or asset groups are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. Factors that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of assets may not be recoverable. Where such factors indicate potential impairment, the recoverability of an asset or asset group is assessed by determining if the carrying value of the asset or asset group exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the assets over the remaining economic life.  The impairment loss is measured based on the difference between the carrying amount and estimated fair value.

Goodwill and Intangible assets

Goodwill

Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually, or whenever changes in circumstances indicate that the carrying amount of goodwill or intangible assets may not be recoverable. These tests are performed at the reporting unit level using a two-step, fair-value based approach. In testing for a potential impairment of goodwill, the Company first compares the carrying value of assets and liabilities to the estimated fair value. If estimated fair value is less than carrying value, then potential impairment exists. The amount of any impairment is then calculated by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value.

The process of evaluating the potential impairment of goodwill requires significant judgment at many points during the analysis, including calculating fair value of each reporting unit based on estimated future cash flows and discount rates to be applied. The Company re-evaluates its intangible assets and goodwill for impairment during the fourth quarter of fiscal year. Goodwill is recorded in other long-term assets in the Company's consolidated balance sheets.

Intangible Assets

Intangible assets are stated at cost less accumulated amortization. Intangible assets include patents and exclusive technology rights, trade names and customer relationships. Intangible assets with finite lives are amortized on a straight-line basis over the estimated periods of benefit, as follows:

Patents and exclusive technology rights	3 to 7 years
Trade name	3 years
Customer relationships	4 years

The Company evaluates its finite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to future undiscounted net cash flows expected to be generated by the asset group. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount and fair value less costs to sell. Intangible assets are recorded in other long-term assets in the Company's consolidated balance sheets.

Revenue Recognition

Revenue Recognition

The Company recognizes revenue when there is persuasive evidence that an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and when collectability is reasonably assured. The Company recognizes revenue when product is shipped to the customer, net of estimated stock rotation returns and price adjustments that it expects to provide to certain distributors.

The Company sells its products primarily to distributors, who in turn sell the products globally to various end customers. The Company allows stock rotation returns from certain distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of products purchased by distributors during a specified period. The Company records an allowance for stock rotation returns based on historical returns and individual distributor agreements. The Company also provides special pricing to certain distributors, primarily based on volume, to encourage resale of the Company's products. The Company estimates the expected price adjustments at the time revenue is recognized based on distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for its products. If actual stock rotation returns or price adjustments differ from their estimates, adjustments are recorded in the period when the actual information is known. Allowance for price adjustments is recorded against accounts receivable and the provision for stock rotation rights is included in accrued liabilities on the consolidated balance sheets.

Revenue from certain distributors is deferred until the distributor resells the products to end customers due to price protection adjustments and right of returns that cannot be reliably measured. The deferred revenue, net of the associated deferred cost of the inventory, is recorded as deferred margin on the consolidated balance sheets.

Packaging and testing services revenue is recognized upon shipment of serviced products to the customer.

Product Warranty

Product Warranty

The Company provides a standard one-year warranty for the products it sells. The Company accrues for estimated warranty costs at the time revenue is recognized. The Company's warranty obligation is affected by product failure rates, labor and material costs for replacing defective parts, related freight costs for failed parts and other quality assurance costs. The Company monitors its product returns for warranty claims and maintains warranty reserves based on historical experiences and anticipated warranty claims known at the time of estimation.

Shipping and Handling Costs

Shipping and Handling Costs

Shipping and handling costs are included in cost of goods sold.

Research and Development

Research and Development

Research and development costs are expensed as incurred.

Provision for Income Taxes

Provision for Income Taxes

Income tax expense or benefit is based on income or loss before taxes. Deferred tax assets and liabilities are recognized principally for the expected tax consequences of temporary differences between the tax basis of assets and liabilities and their reported amounts.

The Company is subject to income taxes in a number of jurisdictions. Significant judgment is required in determining the worldwide provision for income taxes. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. The Company establishes accruals for certain tax contingencies based on estimates of whether additional taxes may be due. While the final tax outcome of these matters may differ from the amounts that were initially recorded, such differences will impact the income tax and deferred tax provisions in the period in which such determination is made.

Significant management judgment is also required in determining whether deferred tax assets will be realized in full or in part. When it is more likely than not that all or some portion of specific deferred tax assets such as net operating losses or research and experimentation tax credit carryforwards will not be realized, a valuation allowance must be established for the amount of the deferred tax assets that cannot be realized. We consider all available positive and negative evidence on a jurisdiction-by-jurisdiction basis when assessing whether it is more likely than not that deferred tax assets are recoverable. We consider evidence such as our past operating results, the existence of cumulative losses in recent years and our forecast of future taxable income.

The Financial Accounting Standards Board, or FASB, issued guidance which clarifies the accounting for income taxes by prescribing a minimum probability threshold that a tax position must meet before a financial statement benefit is recognized. The minimum threshold is defined as a tax position that is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The tax benefit to be recognized is measured as the largest amount of benefit that is greater than fifty percent likely to be realized upon ultimate settlement. Although the guidance on the accounting for uncertainty in income taxes prescribes the use of a recognition and measurement model, the determination of whether an uncertain tax position has met those thresholds will continue to require significant judgment by management. If the ultimate resolution of tax uncertainties is different from what is currently estimated, a material impact on income tax expense could result.

Our provision for income taxes is subject to volatility and could be adversely impacted by changes in earnings or tax laws and regulations in various jurisdictions. We are subject to the continuous examination of our income tax returns by the Internal Revenue Service and other tax authorities. We regularly assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. To the extent that the final tax outcome of these matters is different from the amounts recorded, such differences will impact the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the impact of changes to reserves, as well as the related net interest and penalties.

Share-based Compensation Expense

Share-based Compensation Expense

The Company recognizes expense related to share-based compensation awards that are ultimately expected to vest based on estimated fair values on the date of grant using the Black-Scholes option valuation model. Share-based compensation expense is recognized on the accelerated vesting attribution basis over the requisite service period of the award, which generally equals the vesting period.

The Company maintains an equity-settled, share-based compensation plan which grants share options and restricted share units (the "RSUs") to employees, directors and consultants. In May 2010, the Company adopted the Employee Share Purchase Plan (the "ESPP"). The fair value of RSUs is based on the fair value of the Company's common share on the date of grant. The fair values of stock options and common stock issued under the ESPP are determined at the date of grant using the Black-Scholes option valuation model.

The Company determined the weighted average valuation assumptions as follows:

• Expected term is determined by using the historical data of industry peers as adjusted for expected changes in future exercise patterns. Starting July 2016, expected term will be estimated using the Company’s historical exercise behavior and expected future exercise behavior.

• Forfeiture rate is estimated based on the historical average period of time that the awards were outstanding and forfeited. The estimate of forfeitures is adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from the prior estimates. Changes in estimated forfeitures are recognized in the period of change and impact the amount of stock compensation expenses to be recognized in future periods, which could be material if actual results differ significantly from our estimates.

• Volatility is estimated based on combining both the Company's historical volatility and the volatility of industry peers over a period equivalent to the expected term of the stock awards granted. Starting July 2016, the Company's publicly traded shares history will be solely used in estimating the volatility rate.

• Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the awards granted.

• Dividend yield is zero as the Company has never declared or paid any dividends and currently has no intention to pay dividends in the foreseeable future.

Advertising

Advertising

Advertising expenditures are expensed as incurred. Advertising expense was $0.4 million, $0.5 million, and $0.3 million for the fiscal years ended June 30, 2016, 2015, and 2014, respectively.

Comprehensive Income (loss)

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments.

Leases

Leases

Leases entered into by the Company as a lessee are classified as capital or operating leases. Leases that transfer to the Company substantially the entire risks and benefits incidental to ownership are classified as capital leases. At the inception of a capital lease, an asset and an obligation are recorded at an amount equal to the lesser of the present value of the minimum lease payments and the asset’s fair market value at the beginning of each lease. Rental payments under operating leases are expensed as incurred.

Risks and Uncertainties

Risks and Uncertainties

The Company is subject to certain risks and uncertainties. The Company believes changes in any of the following areas could have a material adverse effect on the Company's future financial position or results of operations or cash flows: new product development, including market receptiveness, operation of in-house manufacturing facilities, litigation or claims against the Company based on intellectual property, patent, product regulatory or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees, the ability to successfully operate joint venture and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures and cyclical market patterns. The Company's financial results are affected by a wide variety of factors, including general economic conditions specific to the semiconductor industry and the Company's particular market, such as the personal computing (PC) markets, the timely implementation of new products, new manufacturing process technology and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in operating results due to the factors mentioned above or other factors.

The Company transitioned from a fabless to a “fab-lite” business model by completing the acquisition of the Oregon fab on January 31, 2012. Under this model, the Company allocates its wafer manufacturing requirements to both in-house capacity and selected third-party foundries. The Company also deploys and implements its proprietary power discrete processes and equipment at third-party foundries to maximize the performance and quality of its products.

The Company's revenue may be impacted by its ability to obtain adequate wafer supplies from third-party foundries and utilize wafer production and packaging and testing capacity from its in-house facilities. Currently the Company's main third-party foundry is Shanghai Hua Hong Grace Electronic Company Limited, or HHGrace, located in Shanghai, China. HHGrace has been manufacturing wafers for the Company since 2002. HHGrace manufactured ­25.0% and 25.0% of the wafers used in the Company's products for the fiscal year ended June 30, 2016 and 2015, respectively. Although the Company believes that its volume of production allows the Company to secure favorable pricing and priority in allocation of capacity in its third-party foundries, if the foundries' capacities are constrained due to market demands, HHGrace, together with other foundries from which the Company purchases wafers, may not be willing or able to satisfy all of the Company's manufacturing requirements on a timely basis and/or at favorable prices. The Company is also subject to the risks of service disruptions and raw material shortages by its foundries. Such disruptions, shortages and price increases could harm the Company's operating results. In addition, manufacturing facilities' capacity affects the Company's gross margin because the Company has certain fixed costs associated with its Oregon fab and in-house packaging and testing facilities. If the Company fails to utilize its manufacturing facilities' capacity at a desirable level, its financial condition and results of operations will be adversely effected.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-12, "Revenue from Contracts with Customers (Topic 606) - Narrow-Scope Improvements and Practical Expedients." ASU 2016-12 provides additional guidance established by the FASB-IASB Joint Transition Resource Group for Revenue Recognition regarding the implementation of certain aspects of the new revenue recognition guidance. More specifically, the amendment provides additional guidance regarding assessing the collectibility criterion, the presentation of sales taxes and other similar taxes collected from customers, noncash consideration, contract modifications or completed contracts at transition of the new revenue recognition guidance and technical corrections. The effective date is consistent with the effective date of ASU 2014-09. The Company is currently evaluating the impact the adoption of ASU 2016-12 will have on its consolidated financial statements.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"). ASU 2016-10 clarify two aspects of Topic 606: (a) identifying performance obligations; and (b) the licensing implementation guidance. The update is effective for annual periods beginning after December 15, 2017 including interim reporting periods therein. The Company is currently evaluating the impact the adoption of ASU 2016-10 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of related amounts within the statement of cash flows. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2016, the FASB issued No. 2016-02, Leases ("ASU 2016-02"). This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In July 2015, the FASB issued No. 2015-11, Inventory - Simplifying the Measurement of Inventory ("ASU 2015-11"). ASU 2015-11 is additional guidance regarding the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value. This guidance is effective for fiscal years and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In April 2015, the FASB issued ASU No. 2015-03, Interest -Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts and the accounting for debt issue costs under IFRS. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. ASU 2015-03 is effective for the annual period beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments in this Update is permitted for financial statements that have not been previously issued. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In February 2015, the FASB issued ASU No. 2015-2, “Consolidation (Topic 820): Amendments to the Consolidation Analysis.” ASU 2015-2 provides a revised consolidation model for all reporting entities to use in evaluating whether they should consolidate certain legal entities. All legal entities will be subject to reevaluation under this revised consolidation model. The revised consolidation model, among other things, (i) modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities, (ii) eliminates the presumption that a general partner should consolidate a limited partnership, and (iii) modifies the consolidation analysis of reporting entities that are involved with VIEs through fee arrangements and related party relationships. ASU 2015-2 is effective for fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In August 2014, the FASB issued amended standards No. 2014-15, Presentation of Financial Statements - Going Concern ("ASU 2014-15"), to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures requirement. The amendments (1) provide a definition of the term substantial doubt, (2) require an evaluation for each annual and interim reporting period, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is not alleviated, and (6) require an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early adoption is permitted. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. In August 2015, the FASB issued an accounting standard update for a one-year deferral of the effective date of ASU 2014-09 to annual and interim periods beginning after December 15, 2017 and permits entities to early adopt the standard of ASU 2014-09 for annual and interim reporting periods beginning after December 15, 2016. Companies are permitted to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

Impact of Recent Accounting Pronouncements Adoption

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which eliminates the requirement for companies to present deferred tax liabilities and assets as current and non-current in a classified balance sheet. Instead, upon adoption, companies are required to classify all deferred tax assets and liabilities as non-current. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 and has made the necessary conforming reclassifications to the accompanying June 30, 2016 consolidated balance sheet and related footnote disclosures. The application of the provisions of ASU 2015-17 resulted in a $2.2 million reduction in current deferred tax assets, a $1.5 million increase in long-term deferred income tax assets and a $0.7 million reduction in non-current deferred income tax liabilities at June 30, 2015.

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The Company and Significant Accounting Policies (Tables)

12 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property, Plant and Equipment

Depreciation is provided for on a straight-line basis over the estimated useful lives of the related assets as follows:

Building	20 years
Manufacturing machinery and equipment	3 to 10 years
Equipment and tooling	5 years
Computer equipment and software	3 to 5 years
Office furniture and equipment	5 years
Leasehold improvements	2 to 15 years based on shorter of expected economic useful life or the lease term

Property, plant and equipment, net

	June 30,
	2016			2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,323			4,243
Manufacturing machinery and equipment	193,164			172,467
Equipment and tooling	12,289			11,261
Computer equipment and software	23,448			20,602
Office furniture and equipment	1,822			1,762
Leasehold improvements	28,660			27,568
	268,583			242,780
Less accumulated depreciation	(168,687		)	(141,883		)
	99,896			100,897
Equipment and construction in progress	16,188			18,682
Property, plant and equipment, net	$	116,084		$	119,579

Schedule of Finite-Lived Intangible Assets

Intangible Assets

Intangible assets are stated at cost less accumulated amortization. Intangible assets include patents and exclusive technology rights, trade names and customer relationships. Intangible assets with finite lives are amortized on a straight-line basis over the estimated periods of benefit, as follows:

Patents and exclusive technology rights	3 to 7 years
Trade name	3 years
Customer relationships	4 years

Intangible assets

	June 30,
	2016			2015
	(in thousands)
Patents and exclusive technology rights	$	1,248		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	2,666			2,666
Less accumulated amortization	(2,651		)	(2,649		)
Intangible assets, net	$	15		$	17

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Net Income (Loss) Per Share (Tables)

12 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted net loss per share attributable to common shareholders:

	Year Ended June 30,
	2016			2015			2014
	(in thousands, except per share data)
Numerator:
Net loss attributable to Alpha and Omega Semiconductor Limited	$	(2,928	)	$	(7,763	)	$	(3,104	)
Denominator:
Basic:
Weighted average number of common shares used to compute basic net loss per share	22,452			26,429			25,952
Diluted:
Weighted average number of common shares used to compute diluted net loss per share	22,452			26,429			25,952
Net loss per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	(0.13	)	$	(0.29	)	$	(0.12	)
Diluted	$	(0.13	)	$	(0.29	)	$	(0.12	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potential dilutive securities were excluded from the computation of diluted net loss per share as their effect would have been anti-dilutive:

	Year Ended June 30,
	2016	2015	2014
	(in thousands)
Employee stock options and RSUs	3,206	3,737	3,940
ESPP	414	380	601
Total potential dilutive securities	3,620	4,117	4,541

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Balance Sheet Components (Tables)

12 Months Ended

Jun. 30, 2016

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable

	June 30,
	2016			2015
	(in thousands)
Accounts receivable	$	43,324		$	58,249
Less: Allowance for price adjustments	(16,700		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	26,594		$	38,781

Schedule of Inventory, Current

Inventories

	June 30,
	2016		2015
	(in thousands)
Raw materials	$	23,982	$	19,423
Work in-process	32,446		31,269
Finished goods	12,420		13,483
	$	68,848	$	64,175

Property, Plant and Equipment

Depreciation is provided for on a straight-line basis over the estimated useful lives of the related assets as follows:

Building	20 years
Manufacturing machinery and equipment	3 to 10 years
Equipment and tooling	5 years
Computer equipment and software	3 to 5 years
Office furniture and equipment	5 years
Leasehold improvements	2 to 15 years based on shorter of expected economic useful life or the lease term

Property, plant and equipment, net

	June 30,
	2016			2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,323			4,243
Manufacturing machinery and equipment	193,164			172,467
Equipment and tooling	12,289			11,261
Computer equipment and software	23,448			20,602
Office furniture and equipment	1,822			1,762
Leasehold improvements	28,660			27,568
	268,583			242,780
Less accumulated depreciation	(168,687		)	(141,883		)
	99,896			100,897
Equipment and construction in progress	16,188			18,682
Property, plant and equipment, net	$	116,084		$	119,579

Schedule of Other Assets, Noncurrent

Other long-term assets

	June 30,
	2016		2015
	(in thousands)
Prepayments for property and equipment	$	548	$	692
Investment in a privately held company	100		100
Office leases deposits	1,427		1,215
Other	—		4
Intangible assets	15		17
Goodwill	269		269
	$	2,359	$	2,297

Schedule of Finite-Lived Intangible Assets

Intangible Assets

Intangible assets are stated at cost less accumulated amortization. Intangible assets include patents and exclusive technology rights, trade names and customer relationships. Intangible assets with finite lives are amortized on a straight-line basis over the estimated periods of benefit, as follows:

Patents and exclusive technology rights	3 to 7 years
Trade name	3 years
Customer relationships	4 years

Intangible assets

	June 30,
	2016			2015
	(in thousands)
Patents and exclusive technology rights	$	1,248		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	2,666			2,666
Less accumulated amortization	(2,651		)	(2,649		)
Intangible assets, net	$	15		$	17

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Future minimum amortization expense of intangible assets is as follows (in thousand):

Year ending June 30,
2017	$	2
2018	2
2019	2
2020	2
2021	2
Thereafter	5
	$	15

Schedule of Goodwill

Goodwill

The changes in the carrying value of goodwill is as follows (in thousands):

	(in thousands)
Balance at June 30, 2014	$	269
Addition:	—
Balance at June 30, 2015	269
Addition:	—
Balance at June 30, 2016	$	269

Schedule of Accrued Liabilities

Accrued liabilities

	June 30,
	2016		2015
	(in thousands)
Accrued compensation and benefits	$	10,211	$	8,582
Warranty accrual	1,495		1,957
Stock rotation accrual	1,988		1,894
Accrued professional fees	1,867		1,402
Accrued inventory	918		697
Accrued facilities related expenses	1,544		1,367
Other accrued expenses	4,567		3,326
	$	22,590	$	19,225

Schedule of Product Warranty Liability

The activity in the warranty accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346		$	1,428
Addition	881			2,395			1,267
Utilization	(1,343		)	(1,784		)	(1,349		)
Ending balance	$	1,495		$	1,957		$	1,346

Stock Rotation Accrual

The activity in the stock rotation accrual, included in accrued liabilities is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645		$	1,572
Addition	6,578			5,781			5,006
Utilization	(6,484		)	(5,532		)	(4,933		)
Ending balance	$	1,988		$	1,894		$	1,645

Deferred Margin

Deferred margin

Deferred margin consists of the following:

	June 30,
	2016			2015
	(in thousands)
Deferred revenue	$	1,494		$	1,104
Deferred costs	(497		)	(388		)
Deferred margin	$	997		$	716

Schedule of Capital Lease

Capital leases

Long-term capital leases were included in the other long term liabilities in the consolidated balance sheets. Capital lease liabilities as of June 30, 2016 and 2015 consisted of the following:

	June 30,
	2016			2015
	(in thousands)
Computer software	$	2,449		$	923
Exclusive technology rights	65			82
	2,514			1,005
Less current portion	(819		)	(941		)
Capital leases - long-term portion	$	1,695		$	64

Schedule of Future Minimum Lease Payments for Capital Leases

Future minimum lease payments at June 30, 2016 are as follows (in thousand):

Year ending June 30,
2017	$	892
2018	892
2019	892
Total minimum lease payments	2,676
Less amount representing interest	(162		)
Total capital lease liabilities	$	2,514

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Concentration of Credit Risk and Significant Customers (Tables)

12 Months Ended

Jun. 30, 2016

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor

Summarized below are individual customers whose revenue or accounts receivable balances were 10% or higher than the respective total consolidated amounts:

	Year Ended June 30,
Percentage of revenue	2016		2015		2014
Customer A	23.8	%	25.4	%	21.6	%
Customer B	37.2	%	36.1	%	43.1	%
Customer C	12.3	%	11.7	%	11.6	%

	June 30,
Percentage of accounts receivable	2016		2015
Customer A	21.3	%	29.4	%
Customer B	16.7	%	27.7	%
Customer C	27.2	%	14.7	%

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Share-based Compensation (Tables)

12 Months Ended

Jun. 30, 2016

Share-based Compensation [Abstract]

Summary of Stock Option Activities

A summary of the stock option activities under the 2000 Plan and 2009 Plan is as follows:

					Weighted		Weighted
			Weighted		Average		Average
			Average		Grant Date		Remaining
	Number of		Exercise Price		Fair Value		Contractual	Aggregate
	Shares		Per Share		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2013	3,593,854		$	10.24			5.46
Granted	764,375		$	7.49	$	3.85
Exercised	(421,456	)	$	2.60				$	2,222,155
Canceled or forfeited	(697,989	)	$	11.65
Outstanding at June 30, 2014	3,238,784		$	10.28			5.79
Granted	10,000		$	9.07	$	4.42
Exercised	(269,861	)	$	5.22				$	1,088,061
Canceled or forfeited	(142,706	)	$	10.08
Outstanding at June 30, 2015	2,836,217		$	10.77			4.64
Granted	—		$	—	$	—
Exercised	(666,445	)	$	8.36				$	1,746,173
Canceled or forfeited	(310,512	)	$	12.34
Outstanding at June 30, 2016	1,859,260		$	11.37			4.71	$	5,959,720
Options vested and expected to vest	1,840,261		$	11.41			4.68	$	5,839,323
Exercisable at June 30, 2016	1,595,992		$	12.00			4.22	$	4,296,568

Shares Authorized under Stock Option Plans, by Exercise Price Range

					Weighted		Weighted
			Weighted		Average		Average
			Average		Grant Date		Remaining
	Number of		Exercise Price		Fair Value		Contractual	Aggregate
	Shares		Per Share		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2013	3,593,854		$	10.24			5.46
Granted	764,375		$	7.49	$	3.85
Exercised	(421,456	)	$	2.60				$	2,222,155
Canceled or forfeited	(697,989	)	$	11.65
Outstanding at June 30, 2014	3,238,784		$	10.28			5.79
Granted	10,000		$	9.07	$	4.42
Exercised	(269,861	)	$	5.22				$	1,088,061
Canceled or forfeited	(142,706	)	$	10.08
Outstanding at June 30, 2015	2,836,217		$	10.77			4.64
Granted	—		$	—	$	—
Exercised	(666,445	)	$	8.36				$	1,746,173
Canceled or forfeited	(310,512	)	$	12.34
Outstanding at June 30, 2016	1,859,260		$	11.37			4.71	$	5,959,720
Options vested and expected to vest	1,840,261		$	11.41			4.68	$	5,839,323
Exercisable at June 30, 2016	1,595,992		$	12.00			4.22	$	4,296,568

The aggregate intrinsic value for options outstanding at June 30, 2016 in the table above is based on the Company’s common stock closing price on June 30, 2016.

Information with respect to stock options outstanding and exercisable as of June 30, 2016 is as follows:

Stock Options, Valuation Assumptions

The fair value of stock options granted during the years ended June 30, 2015 and 2014 were estimated at the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions:

	Year Ended June 30,
	2016	2015	2014
Volatility rate	—%	40.9% - 43.5%	46.9% - 49.2%
Risk-free interest rate	—%	1.6% - 1.8%	1.0% - 1.7%
Expected option life	—	5.5 years	5.5 years
Dividend yield	—%	—%	—%

Restricted Stock Units Activity

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share			Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2013	549,553			$	9.50	1.87	$	4,198,585
Granted	368,554			$	7.54
Vested	(136,581	)		$	9.46
Forfeited	(125,152	)		$	9.54
Nonvested at June 30, 2014	656,374			$	8.40	1.77	$	6,084,587
Granted	493,622			$	8.92
Vested	(213,180	)		$	8.65
Forfeited	(62,870	)		$	8.35
Nonvested at June 30, 2015	873,946			$	8.64	1.77	$	7,638,288
Granted	466,255			$	11.28
Vested	(301,695	)		$	10.97
Forfeited	(105,443	)		$	8.85
Nonvested at June 30, 2016	933,063			$	9.18	1.73	$	12,997,568

Employee Stock Purchase Plan, Valuation Assumptions

The ESPP is compensatory and results in compensation expense. The fair values of common shares to be issued under the ESPP were determined using the Black-Scholes option valuation model with the following assumptions:

	Year Ended June 30,
	2016	2015	2014
Volatility rate	32.2% - 34.8%	31.4% - 50.0%	50.0%
Risk-free interest rate	0.3% - 0.9%	0.1% - 0.6%	0.1% - 0.4%
Expected term	1.3 years	1.3 years	1.3 years
Dividend yield	—%	—%	—%

Share-based Compensation, Allocation of Recognized Period Costs

The total share-based compensation expense related to stock options, ESPP and RSUs described above, recognized in the consolidated statements of operations for the years presented was as follows:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Cost of goods sold	$	636	$	669	$	614
Research and development	1,115		779		786
Selling, general and administrative	2,562		3,042		1,975
	$	4,313	$	4,490	$	3,375

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Income Taxes (Tables)

12 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Provision for (benefit from) income taxes

The provision for income taxes is comprised of:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. federal taxes:
Current	$	152		$	66		$	(65	)
Deferred	650			852			1,144
Non-U.S. taxes:
Current	3,382			3,059			2,316
Deferred	(169		)	(15		)	(608		)
State taxes, net of federal benefit:
Current	6			(65		)	(38		)
Deferred	—			—			20
Total provision for income taxes	$	4,021		$	3,897		$	2,769

Effective income tax rate reconciliation

The reconciliation of the federal statutory income tax rate to our effective income tax rate is as follows (in percentage):

	Year Ended June 30,
	2016		2015		2014
United States statutory rate	34.0	%	34.0	%	34.0	%
State taxes, net of federal benefit	0.4		1.2		2
Stock based compensation	(0.4	)	0.4		3.2
Foreign taxes, net	440.3		(145.7	)	(900.2	)
Research and development credit	(69.3	)	10		45.4
Non-deductible expenses	1.7		(0.7	)	(8.7	)
Other	(0.1	)	—		(2.3	)
	406.6	%	(100.8	)%	(826.6	)%

Domestic and foreign components of income (loss)

The domestic and foreign components of income (loss) before taxes are:

	Year Ended June 30,
	2016			2015			2014
				(in thousands)
U.S. operations	$	4,259		$	4,614		$	4,184
Non-U.S. operations	(3,270		)	(8,480		)	(4,519		)
Income (loss) before income taxes	$	989		$	(3,866	)	$	(335	)

Components of deferred tax assets and liabilities

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities are as follows:

	June 30,
	2016			2015
	(in thousands)
Deferred tax assets:
Accrued compensation	$	2,267		$	1,915
Net operating loss carryforwards	67			81
Depreciation	10,345			11,079
Tax credits	6,069			5,171
Accruals and reserves	934			658
Total deferred tax assets	19,682			18,904
Valuation allowance	(2,894		)	(2,700		)
Total deferred tax assets, net of valuation allowance	16,788			16,204
Deferred tax liabilities:
Depreciation and amortization	(7,388		)	(5,651		)
Accruals and reserves	(241		)	(523		)
Total deferred tax liabilities	(7,629		)	(6,174		)
Net deferred tax assets	$	9,159		$	10,030

Schedule of deferred tax assets and liabilities, current and noncurrent

The breakdown between current and non-current deferred tax assets and liabilities is as follows:

	June 30,
	2016			2015
	(in thousands)
Long-term deferred tax assets	$	12,132		$	12,340
Long-term deferred tax liabilities	(2,973		)	(2,310		)
Net deferred tax assets	$	9,159		$	10,030

Unrecognized tax benefits rollforward

At June 30, 2016, the Company had approximately $6.7 million in total unrecognized tax benefits. A reconciliation of the beginning and ending amount of unrecognized tax benefits from July 1, 2014 to June 30, 2016 is as follows:

	Year Ended June 30,
	2016			2015			2014
	(in thousands)
Balance at beginning of year	$	6,412		$	6,760		$	7,668
Additions based on tax positions related to the current year	388			297			329
Additions (reductions) based on tax positions related to prior years	—			4			(18		)
Reductions due to lapse of applicable statute of limitations	(57		)	(649		)	(1,219		)
Balance at end of year	$	6,743		$	6,412		$	6,760

At June 30, 2016, the total unrecognized tax benefits of $6.7 million included $5.4 million of unrecognized tax benefits that have been netted against the related deferred tax assets. The remaining $1.3 million of unrecognized tax benefits was recorded within long-term income tax payable on the Company's consolidated balance sheet as of June 30, 2016.

The total unrecognized tax benefits of $6.7 million at June 30, 2016 included $4.4 million that, if recognized, would reduce the effective income tax rate in future periods.

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Segment and Geographic information (Tables)

12 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Long-lived assets, consisting of property, plant and equipment by geographical area are as follows:

	June 30,
	2016		2015
	(in thousands)
China	$	64,272	$	71,618
United States	51,214		47,439
Other countries	598		522
	$	116,084	$	119,579

The revenue by geographical location in the following tables is based on the country or region in which the products were shipped to:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Hong Kong	$	290,555	$	277,825	$	271,728
China	37,444		42,103		38,740
South Korea	1,960		2,253		3,033
United States	3,110		2,942		1,976
Other countries	2,592		2,812		2,644
	$	335,661	$	327,935	$	318,121

Revenue from External Customers by Products and Services

The following is a summary of revenue by product type:

	Year Ended June 30,
	2016		2015		2014
	(in thousands)
Power discrete	$	252,063	$	248,716	$	246,033
Power IC	69,344		63,529		53,993
Packaging and testing services	14,254		15,690		18,095
	$	335,661	$	327,935	$	318,121

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Commitments and Contingencies (Tables)

12 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Operating leases, future minimum lease payments

Future minimum lease payments of these leases at June 30, 2016 are as follows:

Year ending June 30,	Operating Leases
	(in thousands)
2017	$	3,200
2018	2,249
2019	1,849
2020	1,484
2021	554
Thereafter	574
	$	9,910

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The Company and Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Significant Accounting Policies [Line Items]
Net loss	$ (2,928,000)	$ (7,763,000)	$ (3,104,000)
Length of product warranty	1 year
Advertising expense	$ 400,000	500,000	300,000
Impairment of long-lived assets	400,000
Deferred income tax liabilities	$ 2,973,000	2,310,000
New Accounting Pronouncement, Early Adoption, Effect [Member]
Significant Accounting Policies [Line Items]
Deferred income tax liabilities		(700,000)
Deferred tax assets, current		2,200,000
Deferred tax assets, noncurrent		$ 1,500,000
Building [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Equipment and tooling [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Office furntiture and equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Internally developed software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Length of economic benefit to capitalize internal use software development costs	1 year
Minimum [Member] | Manufacturing machinery and equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Minimum [Member] | Computer equipment and software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Minimum [Member] | Leasehold improvements [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Maximum [Member] | Manufacturing machinery and equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Maximum [Member] | Computer equipment and software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Maximum [Member] | Leasehold improvements [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	15 years
Patents and exclusive technology rights [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	3 years
Patents and exclusive technology rights [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	7 years
Trade name [Member]
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	3 years
Customer relationships [Member]
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	4 years
Supplier Concentration Risk [Member] | Cost of Goods, Product Line [Member]
Significant Accounting Policies [Line Items]
Percent of wafers manufactured	25.00%	25.00%
Scenario, Adjustment [Member] | Adjustment on Overstatement of Long-Term Deferred Income Tax Liability and Income Tax Expense [Member]
Significant Accounting Policies [Line Items]
Net loss	$ 172,000	$ 204,000	149,000
Earnings Per Share, Basic and Diluted	$ 0.01
Scenario, Adjustment [Member] | Adjustment on Overstatement of Long-Term Deferred Income Tax Liability and Retained Earnings [Member] [Domain]
Significant Accounting Policies [Line Items]
Deferred income tax liabilities	$ 525,000	353,000	149,000
Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member]
Significant Accounting Policies [Line Items]
Investments in and Advances to Affiliates, at Fair Value	330,000,000
Parent Company [Member]
Significant Accounting Policies [Line Items]
Net loss	$ (2,928,000)	$ (7,763,000)	$ (3,104,000)
Parent Company [Member] | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member]
Significant Accounting Policies [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	51.00%
Chongqing Funds [Member] | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member]
Significant Accounting Policies [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	49.00%

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Net Income (Loss) Per Share - Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net loss	$ (2,928)	$ (7,763)	$ (3,104)
Basic:
Weighted average number of common shares used to compute basic net income per share	22,452	26,429	25,952
Diluted:
Weighted average number of common shares used to compute diluted net income per share	22,452	26,429	25,952
Net income per share attributable to common shareholders:
Basic (in dollars per share)	$ (0.13)	$ (0.29)	$ (0.12)
Diluted (in dollars per share)	$ (0.13)	$ (0.29)	$ (0.12)

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Net Income (Loss) Per Share - Potential Dilutive Shares (Details) - shares shares in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	3,620	4,117	4,541
Employee stock options and RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	3,206	3,737	3,940
ESPP [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	414	380	601

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Balance Sheet Components - Accounts receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 43,324	$ 58,249
Less: Allowance for price adjustments	(16,700)	(19,438)
Less: Allowance for doubtful accounts	(30)	(30)
Less: Allowance for doubtful accounts	$ 26,594	$ 38,781

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Concentration of Credit Risk and Significant Customers (Details)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Minimum [Member]
Concentration Risk
Terms of credit sales, (in days)	30 days
Maximum [Member]
Concentration Risk
Terms of credit sales, (in days)	60 days
Customer A [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	23.80%	25.40%	21.60%
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	21.30%	29.40%
Customer B [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	37.20%	36.10%	43.10%
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	16.70%	27.70%
Customer C [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	12.30%	11.70%	11.60%
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk
Customers greater than 10% of total	27.20%	14.70%

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Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 23,982	$ 19,423
Work in-process	32,446	31,269
Finished goods	12,420	13,483
Inventories	$ 68,848	$ 64,175

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Balance Sheet Components - Property, plant, and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 268,583	$ 242,780
Less accumulated depreciation	(168,687)	(141,883)
Property, plant and equipment excluding equipment and construction in progress, net	99,896	100,897
Equipment and construction in progress	16,188	18,682
Property, plant and equipment, net	116,084	119,579
Depreciation expense	27,300	27,400	$ 27,500
Capitalized software development costs	200	1,000	1,100
Amortization of capitalized software development costs	600	500	$ 400
Unamortized capitalized software development costs	1,400	1,800
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,877	4,877
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,323	4,243
Manufacturing machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	193,164	172,467
Equipment and tooling [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	12,289	11,261
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	23,448	20,602
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	1,822	1,762
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	28,660	27,568
Software [Member]
Property, Plant and Equipment [Line Items]
Gross amount of computer software recorded under capital lease	8,300	5,800
Accumulated depreciation on computer software recorded under capital lease	$ 5,600	$ 4,500

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Balance Sheet Components - Impairment of long-lived assets, intangible assets, and goodwill (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]
Impairment of long-lived assets	$ 400,000
Impairment of intangible assets	0	$ 0	$ 0
Impairment of goodwill	$ 0	$ 0	$ 0

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Balance Sheet Components - Intangible assets (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 2,666,000	$ 2,666,000
Less accumulated amortization	(2,651,000)	(2,649,000)
Intangible assets, net	15,000	17,000
Amortization expense	2,000	100,000	$ 400,000
Patents and exclusive technology rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,248,000	1,248,000
Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	268,000	268,000
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 1,150,000	$ 1,150,000

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Balance Sheet Components Future amortization expense of intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 2
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	5
Intangible assets, net	$ 15	$ 17

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Balance Sheet Components - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Goodwill [Roll Forward]
Beginning balance	$ 269	$ 269
Addition:	0	0
Ending balance	$ 269	$ 269

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Balance Sheet Components - Other long term assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]
Prepayments for property and equipment	$ 548	$ 692
Investment in a privately held company	100	100
Office leases deposits	1,427	1,215
Other	0	4
Intangible assets	15	17
Goodwill	269	269	$ 269
Other long-term assets	$ 2,359	$ 2,297

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Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefits	$ 10,211	$ 8,582
Warranty accrual	1,495	1,957	$ 1,346	$ 1,428
Stock rotation accrual	1,988	1,894	$ 1,645	$ 1,572
Accrued professional fees	1,867	1,402
Accrued inventory	918	697
Accrued facilities related expenses	1,544	1,367
Other accrued expenses	4,567	3,326
Accrued liabilities	$ 22,590	$ 19,225

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Balance Sheet Components - Product Warranty Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 1,957	$ 1,346	$ 1,428
Addition	881	2,395	1,267
Utilization	(1,343)	(1,784)	(1,349)
Ending balance	$ 1,495	$ 1,957	$ 1,346

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Balance Sheet Components - Stock Rotation Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Stock Rotation Accrual Increae (Decrease) [Roll Forward]
Beginning balance	$ 1,894	$ 1,645	$ 1,572
Addition	6,578	5,781	5,006
Utilization	(6,484)	(5,532)	4,933
Ending balance	$ 1,988	$ 1,894	$ 1,645

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Balance Sheet Components - Deferred Margin (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Deferred revenue	$ 1,494	$ 1,104
Deferred costs	(497)	(388)
Deferred margin	$ 997	$ 716

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Balance Sheet Components - Capital Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Capital Leased Assets [Line Items]
Capital lease obligations	$ 2,514	$ 1,005
Less current portion	(819)	(941)
Capital leases - long term	1,695	64
Computer software
Capital Leased Assets [Line Items]
Capital lease obligations	2,449	923
Exclusive technology rights
Capital Leased Assets [Line Items]
Capital lease obligations	$ 65	$ 82

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Balance Sheet Components - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 892
2018	892
2019	892
Total minimum lease payments	2,676
Less amount representing interest	(162)
Capital lease obligations	$ 2,514	$ 1,005

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Debt (Details) - USD ($)		3 Months Ended	12 Months Ended
	May 11, 2012	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	May 31, 2013	Jul. 17, 2012
Debt Instrument [Line Items]
Government grant via forgiven loan		$ 300,000	$ 0	$ (250,000)	$ 0
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum limit	$ 10,000,000
Long-term Line of Credit						$ 0
Variable Interest Rate Term Loan Maturing May 2015 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Term loan	$ 20,000,000
State of Oregon Loan [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Term loan							$ 300,000
Debt Instrument, Interest Rate, Stated Percentage							5.00%
Eurodollar [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Eurodollar Additional Margin [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	(0.50%)
Eurodollar Additional Margin [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%

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Joint Venture (Details) - Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member] - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments in and Advances to Affiliates, at Fair Value			$ 330.0
Parent Company [Member]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions			51.00%
Parent Company [Member] | Scenario, Forecast [Member] | Subsequent Event [Member]
Payments to Acquire Interest in Joint Venture		$ 10.0
Chongqing Funds [Member]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions			49.00%
Chongqing Funds [Member] | Subsequent Event [Member]
Payments to Acquire Interest in Joint Venture	$ 33.0

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Shareholders' Equity (Details) $ / shares in Units, $ in Thousands			12 Months Ended			68 Months Ended
	Jul. 07, 2015 USD ($) $ / shares shares	May 04, 2010 shares	Jun. 30, 2016 USD ($) votes $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jul. 08, 2015 USD ($)	Jun. 07, 2015 USD ($) $ / shares	Apr. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	May 08, 2014 USD ($)	Oct. 22, 2010 USD ($)
Common Shares
Common shares, authorized (in shares)			50,000,000	50,000,000		50,000,000
Common shares, par value (in dollars per share) | $ / shares			$ 0.002	$ 0.002		$ 0.002
Common stock, dividends declared per share | $ / shares			$ 0
Number of Votes Per Each Common Share | votes			1
Treasury Shares
Share repurchase program, authorized amount | $												$ 25,000
Share repurchase program, remaining authorized amount | $			$ 6,400			$ 6,400	$ 18,200		$ 50,000	$ 17,800	$ 22,700
Treasury stock acquired, shares repurchased (in shares)			4,695,499	666,230	119,594	5,723,093
Treasury stock acquired less handling fees | $			$ 41,800	$ 5,800	$ 900
Treasury stock acquired | $			$ 42,081	$ 5,816	$ 918	$ 50,800
Treasury stock acquired, average price per share (in dollars per share) | $ / shares			$ 8.90	$ 8.70	$ 7.66	$ 8.87
Treasury stock retired (in shares)			0
Treasury stock reissued average price per share | $ / shares						$ 4.28
Convertible Preferred Shares
Conversion of preferred shares upon the initial public offering (in shares)		10,712,094
Preferred stock, shares authorized (in shares)			10,000,000	10,000,000		10,000,000
Preferred stock, shares outstanding (in shares)			0	0		0
Treasury Stock Reissued [Member]
Treasury Shares
Treasury stock acquired, average price per share (in dollars per share) | $ / shares						$ 12.33
Treasury stock reissued (in shares)						71,803
Series A Preferred Stock [Member]
Convertible Preferred Shares
Preferred stock converted to common stock (in shares)		5,050,000
Series B Preferred Stock [Member]
Convertible Preferred Shares
Preferred stock converted to common stock (in shares)		2,488,094
Series C Preferred Stock [Member]
Convertible Preferred Shares
Preferred stock converted to common stock (in shares)		3,174,000
Dutch Auction Tender Offer [Member] | Common Shares [Member]
Treasury Shares
Share repurchase program, authorized amount | $								$ 30,000
Treasury stock acquired, shares repurchased (in shares)	3,296,703
Treasury stock acquired | $	$ 30,000
Treasury stock acquired, average price per share (in dollars per share) | $ / shares	$ 9.10
Treasury stock acquired, percentage of the Company's common stock issued and outstanding			12.53%			12.53%
Dutch Auction Tender Offer [Member] | Minimum [Member] | Common Shares [Member]
Treasury Shares
Treasury stock acquired, authorized cost (in dollars per share) | $ / shares								$ 8.50
Dutch Auction Tender Offer [Member] | Maximum [Member] | Common Shares [Member]
Treasury Shares
Treasury stock acquired, authorized cost (in dollars per share) | $ / shares								$ 9.20

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Share-based Compensation (Details)		12 Months Ended				48 Months Ended	49 Months Ended
	Apr. 28, 2010 shares	Jun. 30, 2016 USD ($) programs $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2013 $ / shares shares	Dec. 31, 2013 shares	Jan. 31, 2015 shares	Sep. 18, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options vested and expected to vest | $		$ 5,839,323
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		1,595,992
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares		$ 12.00
Aggregate intrinsic value options exercisable | $		$ 4,296,568
Weighted average remaining contractual term of options exercisable		4 years 2 months 19 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		2,836,217	3,238,784	3,593,854
Granted (in shares)		0	10,000	764,375
Exercised (in shares)		(666,445)	(269,861)	(421,456)
Canceled or forfeited (in shares)		(310,512)	(142,706)	(697,989)
Outstanding (in shares)		1,859,260	2,836,217	3,238,784	3,593,854
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding (in dollars per share) | $ / shares		$ 10.77	$ 10.28	$ 10.24
Granted (in dollars per share) | $ / shares		0.00	9.07	7.49
Exercised (in dollars per share) | $ / shares		8.36	5.22	2.60
Canceled or forfeited (in dollars per share) | $ / shares		12.34	10.08	11.65
Outstanding (in dollars per share) | $ / shares		11.37	10.77	10.28	$ 10.24
Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ / shares		$ 0.00	$ 4.42	$ 3.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		4 years 8 months 16 days	4 years 7 months 21 days	5 years 9 months 15 days	5 years 5 months 16 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | $		$ 1,746,173	$ 1,088,061	$ 2,222,155
Aggregate Intrinsic Value, Outstanding | $		$ 5,959,720
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		1,840,261
Weighted average exercise price per share of options vested and expected to vest | $ / shares		$ 11.41
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term		4 years 8 months 5 days
2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive compensation programs | programs		3
Employee stock options and RSUs [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable term (in years)		10 years
Annual increase in shares authorized, percent (lesser of 3%)							3.00%
Annual increase in shares authorized (in shares)							750,000
Number of additional shares authorized		668,915	750,000	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		2,527,000
Monthly vesting schedule (in months)		48 months
Employee stock options and RSUs [Member] | Maximum [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		5 years
Shares authorized under plan (in shares)								1,250,000
Employee stock options and RSUs [Member] | Minimum [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Stock Options [Member] | 2000 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		5 years
Shares authorized under plan (in shares)								5,425,000
Award vesting period percentage		20.00%
Stock options exercisable term (in years)		10 years
Monthly vesting schedule (in months)		48 months
Performance Shares [Member] | Minimum [Member] | 2000 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant price, percent of fair value of common stock at date of grant		100.00%
Exercise price as percent of fair value of common stock for shareholders with more than 10% of outstanding shares of all share classes		110.00%
Performance Shares [Member] | Minimum [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant price, percent of fair value of common stock at date of grant		100.00%
Exercise price as percent of fair value of common stock for shareholders with more than 10% of outstanding shares of all share classes		110.00%
Nonstatutory Stock Options [Member] | Minimum [Member] | 2000 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant price, percent of fair value of common stock at date of grant		85.00%
Nonstatutory Stock Options [Member] | Minimum [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant price, percent of fair value of common stock at date of grant		85.00%
External Board Members [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	7,500					7,500
External Board Members [Member] | Restricted Stock Units (RSUs) [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, value | $		$ 42,000

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Share-based Compensation - Stock Options Outstanding and Exercisable (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 12.00
Aggregate intrinsic value of options vested and expected to vest	$ 5,839,323
Weighted average remaining contractual term of options exercisable	4 years 2 months 19 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,840,261
Weighted average exercise price per share of options vested and expected to vest	$ 11.41
Price Range $7.21 - 7.21 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	6,875
Weighted-Average Remaining Contractual Life (Years)	7 years 6 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 7.21
Number Exercisable (in shares)	6,875
Weighted-Average Exercise Price (in dollars per share)	$ 7.21
Exercise price, upper range limit (in dollars per share)	7.21
Exercise price, lower range limit (in dollars per share)	$ 7.21
Price Range $7.44 - 7.44 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	436,147
Weighted-Average Remaining Contractual Life (Years)	7 years 8 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 7.44
Number Exercisable (in shares)	226,146
Weighted-Average Exercise Price (in dollars per share)	$ 7.44
Exercise price, upper range limit (in dollars per share)	7.44
Exercise price, lower range limit (in dollars per share)	$ 7.44
Price Range $7.47 - 9.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	399,788
Weighted-Average Remaining Contractual Life (Years)	5 years 8 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 8.84
Number Exercisable (in shares)	346,521
Weighted-Average Exercise Price (in dollars per share)	$ 8.92
Exercise price, upper range limit (in dollars per share)	9.90
Exercise price, lower range limit (in dollars per share)	$ 7.47
Price Range $10.22 - 13.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	646,450
Weighted-Average Remaining Contractual Life (Years)	2 years 6 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 12.31
Number Exercisable (in shares)	646,450
Weighted-Average Exercise Price (in dollars per share)	$ 12.31
Exercise price, upper range limit (in dollars per share)	13.00
Exercise price, lower range limit (in dollars per share)	$ 10.22
Price Range $14.14 - $18.00 (Member)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	370,000
Weighted-Average Remaining Contractual Life (Years)	3 years 9 months 22 days
Weighted-Average Exercise Price (in dollars per share)	$ 17.20
Number Exercisable (in shares)	370,000
Weighted-Average Exercise Price (in dollars per share)	$ 17.20
Exercise price, upper range limit (in dollars per share)	18.00
Exercise price, lower range limit (in dollars per share)	$ 14.14
Price Range $7.21 - 18.00 Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	1,859,260
Weighted-Average Remaining Contractual Life (Years)	4 years 8 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 11.37
Number Exercisable (in shares)	1,595,992
Weighted-Average Exercise Price (in dollars per share)	$ 12.00
Exercise price, upper range limit (in dollars per share)	18.00
Exercise price, lower range limit (in dollars per share)	$ 7.21
Employee stock options and RSUs [Member] | 2009 Option/Share Issuance Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of additional shares authorized	668,915	750,000	750,000

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Share-based Compensation - Fair Value of Stock Options Weighted Average Assumptions (Details) - Stock Options [Member]	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	5 years 6 months	5 years 6 months
Dividend yield	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility rate	40.90%	46.90%
Risk-free interest rate	1.60%	1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility rate	43.50%	49.20%
Risk-free interest rate	1.80%	1.70%

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Share-based Compensation - Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Remaining Recognition Period (Years)	1 year 7 months 6 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested	873,946	656,374	549,553
Granted	466,255	493,622	368,554
Vested	(301,695)	(213,180)	(136,581)
Forfeited	(105,443)	(62,870)	(125,152)
Nonvested	933,063	873,946	656,374	549,553
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested	$ 8.64	$ 8.40	$ 9.50
Granted	11.28	8.92	7.54
Vested	10.97	8.65	9.46
Forfeited	8.85	8.35	9.54
Nonvested	$ 9.18	$ 8.64	$ 8.40	$ 9.50
Weighted Average Remaining Recognition Period (Years)	1 year 8 months 23 days	1 year 9 months 7 days	1 year 9 months 7 days	1 year 10 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 12,997,568	$ 7,638,288	$ 6,084,587	$ 4,198,585

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Share-based Compensation - Employee Share Purchase Plan (Details) - Employee Stock [Member] - USD ($)	12 Months Ended			49 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of offering periods for ESPP (in months)	24 months
Percent of compensation allowed for purchase of options	15.00%
Payroll deduction accumulation period (in months)	6 months
Grant price, percent of fair value of common stock at date of grant	85.00%
Shares authorized under plan (in shares)	600,000
Number of additional shares authorized	167,229	192,000	192,000
Weighted-average grant date fair value	$ 2.85	$ 2.80	$ 2.89
Fair Value Assumptions For ESPP
Volatility rate			50.00%
Expected option life (in years)	1 year 3 months 18 days	1 year 3 months 18 days	1 year 3 months 18 days
Dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Fair Value Assumptions For ESPP
Volatility rate	32.20%	31.40%
Risk-free interest rate	0.30%	0.10%	0.10%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common shares that may be purchased on any purchase date (in shares)	875
Maximum number of common shares that may be purchased per a 24-month offering period (in shares)	3,500
Maximum value of common stock that may be purchased in any one calendar year	$ 25,000
Annual increase in shares authorized, percent				0.75%
Annual increase in shares authorized (in shares)				250,000
Fair Value Assumptions For ESPP
Volatility rate	34.80%	50.00%
Risk-free interest rate	0.90%	0.60%	0.40%

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Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 4,313	$ 4,490	$ 3,375
Unrecognized compensation expense	$ 5,800
Recognition period of share-based compensation expense (in years)	1 year 7 months 6 days
Cost of goods sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 636	669	614
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	1,115	779	786
Selling, general and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 2,562	$ 3,042	$ 1,975
Stock Options [Member] | 2000 Share Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period (in years)	5 years
Employee stock options and RSUs [Member] | 2009 Option/Share Issuance Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of additional shares authorized	668,915	750,000	750,000
Maximum [Member] | Employee stock options and RSUs [Member] | 2009 Option/Share Issuance Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period (in years)	5 years
Minimum [Member] | Employee stock options and RSUs [Member] | 2009 Option/Share Issuance Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting period (in years)	4 years

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Employee Benefit Plans (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2016 USD ($) shares
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	1,595,992
United States
Defined Benefit Plan Disclosure [Line Items]
Mandatory employer contributions according to labor and social security laws and regulations, percent	7.70%
Taiwan [Member]
Defined Benefit Plan Disclosure [Line Items]
Mandatory employer contributions according to labor and social security laws and regulations, percent	6.00%
Minimum [Member] | China
Defined Benefit Plan Disclosure [Line Items]
Mandatory employer contributions according to labor and social security laws and regulations, percent	13.00%
Maximum [Member] | China
Defined Benefit Plan Disclosure [Line Items]
Mandatory employer contributions according to labor and social security laws and regulations, percent	20.00%
United States Postretirement Benefit Plan of US Entity [Member] | Retirement Plan, 401-K [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee maximum salary deferral contribution, percent	100.00%
Company contributions to retirement plan | $	$ 0

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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Tax Credit Carryforward [Line Items]
Undistributed earnings of foreign subsidiaries	$ 82,200,000
Unrecognized tax benefits	6,743,000	$ 6,412,000	$ 6,760,000	$ 7,668,000
Unrecognized tax benefit, amount netted against deferred tax assets	5,400,000
Unrecognized tax benefits that would reduce effective income tax rate	4,400,000
Decrease in unrecognized tax benefits is reasonably possible	600,000
Income tax interest and penalties accrued	300,000	200,000
Income tax interest and penalties expense	0	$ (100,000)
Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	3,000,000
State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	4,600,000
Tax credit carryforward, subject to expiration	200,000
Tax credit carryforward, not subject to expiration	4,400,000
Net operating loss carryforwards	0
Long-term Income Tax Payable [Member]
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	$ 1,300,000

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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
U.S. federal taxes:
Current	$ 152	$ 66	$ (65)
Deferred	650	852	1,144
Non-U.S. taxes:
Current	3,382	3,059	2,316
Deferred	(169)	(15)	(608)
State taxes, net of federal benefit:
Current	6	(65)	(38)
Deferred	0	0	20
Total provision for income taxes	$ 4,021	$ 3,897	$ 2,769
Effective income tax rate reconciliation
United States statutory rate	34.00%	34.00%	34.00%
State taxes, net of federal benefit	0.40%	1.20%	2.00%
Stock based compensation	(0.40%)	0.40%	3.20%
Foreign taxes, net	440.30%	(145.70%)	(900.20%)
Research and development credit	(69.30%)	10.00%	45.40%
Non-deductible expenses	1.70%	(0.70%)	(8.70%)
Other	(0.10%)	0.00%	(2.30%)
Effective income tax rate	406.60%	(100.80%)	(826.60%)
Domestic and foreign components of income (loss) before taxes
U.S. operations	$ 4,259	$ 4,614	$ 4,184
Non-U.S. operations	(3,270)	(8,480)	(4,519)
Income (loss) before income taxes	989	(3,866)	(335)
Deferred tax assets:
Accrued compensation	2,267	1,915
Net operating loss carryforwards	67	81
Depreciation	10,345	11,079
Tax credits	6,069	5,171
Accruals and reserves	934	658
Total deferred tax assets	19,682	18,904
Valuation allowance	(2,894)	(2,700)
Total deferred tax assets, net of valuation allowance	16,788	16,204
Deferred tax liabilities:
Depreciation and amortization	(7,388)	(5,651)
Accruals and reserves	(241)	(523)
Total deferred tax liabilities	(7,629)	(6,174)
Net deferred tax assets	9,159	10,030
Current and non-current deferred tax assets and liabilities
Long-term deferred tax assets	12,132	12,340
Long-term deferred tax liabilities	(2,973)	(2,310)
Net deferred tax assets	9,159	10,030
Unrecognized tax benefits rollforward
Balance at beginning of year	6,412	6,760	7,668
Additions based on tax positions related to the current year	388	297	329
Additions (reductions) based on tax positions related to prior years	0		(18)
Additions based on tax positions related to prior years		4
Reductions due to lapse of applicable statute of limitations	(57)	(649)	(1,219)
Balance at end of year	$ 6,743	$ 6,412	$ 6,760

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Segment and Geographic information Segment Narrative (Details)	12 Months Ended
	Jun. 30, 2016 Segment
Segment Reporting [Abstract]
Number of Operating Segments	1

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Segment and Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 335,661	$ 327,935	$ 318,121
Power discrete [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	252,063	248,716	246,033
Power IC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	69,344	63,529	53,993
Packaging and testing services [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	14,254	15,690	18,095
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	290,555	277,825	271,728
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	37,444	42,103	38,740
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,960	2,253	3,033
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,110	2,942	1,976
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,592	$ 2,812	$ 2,644

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Segment and Geographic information Location and Net Book Value of Long-Lived Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 116,084	$ 119,579
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	64,272	71,618
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	51,214	47,439
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 598	$ 522

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Restricted Net Assets (Details) - China - Subsidiaries [Member] - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Restricted Statutory Reserves [Line Items]
Foreign subsidiaries, restricted statutory reserves	$ 84.2	$ 86.8
Foreign subsidiaries, restricted statutory reserves percent of parent consolidated net assets	34.80%	31.40%
Minimum [Member]
Restricted Statutory Reserves [Line Items]
Foreign subsidiaries, minimum percent of after-tax profit required annually in statutory reserves	10.00%
Maximum [Member]
Restricted Statutory Reserves [Line Items]
Foreign subsidiaries, statutory reserves maximum cumulative amount as a percent of registered capital	50.00%

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Commitments and Contingencies - Operating Leases Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 3,500	$ 3,500	$ 3,400
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	3,200
2018	2,249
2019	1,849
2020	1,484
2021	554
Thereafter	574
Future minimum payments due	$ 9,910

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Commitments and Contingencies - Purchase Commitments (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Raw materials, wafers, and packaging and testing services purchase commitments [Member]
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 39.6	$ 29.2
Property and equipment purchase commitments [Member]
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 6.6	$ 3.7

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Commitments and Contingencies - Contingencies and Indemnities (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification accrual	$ 0	$ 0

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Commitments and Contingencies Other Investments (Details) - Subsequent Event [Member] - Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member] - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2016	Jun. 30, 2017
Chongqing Funds [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments to Acquire Interest in Joint Venture	$ 33.0
Scenario, Forecast [Member] | Parent Company [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments to Acquire Interest in Joint Venture		$ 10.0

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Schedule I - Condensed Unconsolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Current assets:
Cash and cash equivalents	$ 87,774	$ 106,085	$ 117,788	$ 92,406
Other current assets	4,526	4,279
Total current assets	187,930	213,688
Property, plant and equipment, net	116,084	119,579
Other long-term assets	2,359	2,297
Total assets	318,505	347,904
Current liabilities:
Total liabilities	76,466	71,265
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	0	0
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57	55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199)	(8,593)
Additional paid-in capital	191,444	181,040
Accumulated other comprehensive income	769	905
Retained earnings	100,071	103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142	276,639
Noncontrolling interest	(103)	0
Total equity	242,039	276,639	283,388	281,600
Total liabilities and equity	318,505	347,904
Parent Company [Member]
Current assets:
Cash and cash equivalents	8,051	17,397	$ 5,187	$ 7,143
Accounts receivable - Intercompany	13,385	39,004
Other current assets	268	291
Total current assets	21,704	56,692
Property, plant and equipment, net	1,308	1,786
Other long-term assets	100	100
Investment in subsidiaries	219,594	218,552
Total assets	242,706	277,130
Current liabilities:
Accounts payable and accrued liabilities	667	491
Total liabilities	667	491
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2016 and 2015	0	0
Common shares, par value $0.002 per share:
Authorized: 50,000 shares; Issued and outstanding: 28,405 shares and 22,754 shares at June 30, 2016 and 27,314 shares and 26,316 shares at June 30, 2015	57	55
Treasury shares at cost; 5,651 shares at June 30, 2016 and 998 shares at June 30, 2015	(50,199)	(8,593)
Additional paid-in capital	191,444	181,040
Accumulated other comprehensive income	769	905
Retained earnings	100,071	103,232
Total Alpha and Omega Semiconductor Limited shareholder's equity	242,142	276,639
Noncontrolling interest	(103)	0
Total equity	242,039	276,639
Total liabilities and equity	$ 242,706	$ 277,130

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Schedule I - Condensed Unconsolidated Balance Sheets (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Noncontrolling interest	$ (103)	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.002	$ 0.002
Common shares, authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	28,405,000	27,314,000
Common stock, shares outstanding (in shares)	22,754,000	26,316,000
Preferred stock, par value (in dollars per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury Stock, Shares	5,651,000	998,000
Parent Company [Member]
Noncontrolling interest	$ (103)	$ 0

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Schedule I - Condensed Unconsolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Gross profit	$ 65,822	$ 60,482	$ 59,071
Operating expenses:
Selling, general and administrative	37,874	37,625	34,554
Total operating expenses	64,312	64,700	58,963
Operating loss	1,510	(4,218)	108
Interest expense	(23)	(181)	(266)
Net loss including noncontrolling interest	(3,032)	(7,763)	(3,104)
Net loss attributable to noncontrolling interest	(104)	0	0
Net loss attributable to Alpha and Omega Semiconductor Limited	(2,928)	(7,763)	(3,104)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	3,345	3,332	3,074
Cost of revenue	0	0	0
Gross profit	3,345	3,332	3,074
Operating expenses:
Selling, general and administrative	3,438	3,477	3,171
Total operating expenses	3,438	3,477	3,171
Operating loss	(93)	(145)	(97)
Interest income	7	7	6
Interest expense	0	(2)	(11)
Loss on equity investment in subsidiaries	(2,946)	(7,623)	(3,002)
Net loss including noncontrolling interest	(3,032)	(7,763)	(3,104)
Net loss attributable to noncontrolling interest	(104)	0	0
Net loss attributable to Alpha and Omega Semiconductor Limited	$ (2,928)	$ (7,763)	$ (3,104)

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Schedule I - Condensed Unconsolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss including noncontrolling interest	$ (3,032)	$ (7,763)	$ (3,104)
Net Income (Loss) Attributable to Parent	(2,928)	(7,763)	(3,104)
Other comprehensive income, net of tax, foreign currency translation adjustment	(135)	(128)	76
Comprehensive loss	(3,167)	(7,891)	(3,028)
Noncontrolling interest	(103)	0	0
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	(3,064)	(7,891)	(3,028)
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss including noncontrolling interest	(3,032)	(7,763)	(3,104)
Net Income (Loss) Attributable to Parent	(2,928)	(7,763)	(3,104)
Other comprehensive income, net of tax, foreign currency translation adjustment	(135)	(128)	76
Comprehensive loss	(3,167)	(7,891)	(3,028)
Noncontrolling interest	(103)	0	0
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$ (3,064)	$ (7,891)	$ (3,028)

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Schedule I - Condensed Unconsolidated Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss including noncontrolling interest	$ (3,032)	$ (7,763)	$ (3,104)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	27,300	27,400	27,500
Share-based compensation expense	4,313	4,490	3,375
Changes in working capital, net of impact of acquisition:
Net cash provided by operating activities	40,182	27,669	37,960
Cash flows from investing activities
Purchase of property and equipment	(21,901)	(21,492)	(9,395)
Net cash used in investing activities	(21,721)	(21,345)	(9,191)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036)	(539)	(316)
Proceeds from exercise of stock options and ESPP	7,371	3,007	2,675
Payment for repurchase of common shares	(42,081)	(5,816)	(918)
Principal payments on capital leases	(940)	(1,061)	(1,267)
Net cash used in financing activities	(36,686)	(17,980)	(3,397)
Net increase (decrease) in cash and cash equivalents	(18,311)	(11,703)	25,382
Cash and cash equivalents at beginning of year	106,085	117,788	92,406
Cash and cash equivalents at end of year	87,774	106,085	117,788
Parent Company [Member]
Cash flows from operating activities
Net loss including noncontrolling interest	(3,032)	(7,763)	(3,104)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	545	587	366
Share-based compensation expense	190	242	187
Equity in net loss of subsidiaries	2,946	7,623	3,002
Changes in working capital, net of impact of acquisition:
Accounts receivable - intercompany	25,620	15,664	(2,333)
Other current assets	23	26	(124)
Accounts payable and accrued liabilities	174	(101)	(191)
Net cash provided by operating activities	26,466	16,278	(2,197)
Cash flows from investing activities
Purchase of property and equipment	(67)	(625)	(919)
Net cash used in investing activities	(67)	(625)	(919)
Cash flows from financing activities
Withholding tax on restricted stock units	(1,036)	(539)	(316)
Proceeds from exercise of stock options and ESPP	7,371	3,007	2,675
Payment for repurchase of common shares	(42,080)	(5,816)	(918)
Principal payments on capital leases	0	(95)	(281)
Net cash used in financing activities	(35,745)	(3,443)	1,160
Net increase (decrease) in cash and cash equivalents	(9,346)	12,210	(1,956)
Cash and cash equivalents at beginning of year	17,397	5,187	7,143
Cash and cash equivalents at end of year	$ 8,051	$ 17,397	$ 5,187

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Schedule I - Condensed Financial Information of Parent Company (Details)	12 Months Ended
	Jun. 30, 2016
Schedule I - Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Restricted Net Assets Threshold for Condensed Parent Company Financial Statements, Percent Requirement	25.00%

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	$ 30	$ 30	$ 752
Additions	0	0	0
Reductions	0	0	(722)
Balance	30	30	30
Allowance for Price Adjustments [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	19,438	14,563	13,152
Additions	90,967	87,189	64,987
Reductions	(93,705)	(82,314)	(63,576)
Balance	16,700	19,438	14,563
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	2,700	2,395	2,127
Additions	194	305	268
Reductions	0	0	0
Balance	$ 2,894	$ 2,700	$ 2,395