10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_________________________________

FORM 10-Q

_________________________________

(MARK ONE)

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

For the quarterly period ended September 30, 2015

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)

__________________________________________

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 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

Number of common shares outstanding as of October 31, 2015: 22,200,060.

Alpha and Omega Semiconductor Limited

Form 10-Q

Fiscal First Quarter Ended September 30, 2015

TABLE OF CONTENTS

		Page
Part I.	FINANCIAL INFORMATION
Item 1.	Financial Statements:	1
	Condensed Consolidated Balance Sheets as of September 30, 2015 and June 30, 2015 (Unaudited)	1
	Condensed Consolidated Statements of Operations for the Three Months Ended September 30, 2015 and 2014 (Unaudited)	2
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three Months Ended September 30, 2015 and 2014 (Unaudited)	3
	Condensed Consolidated Statements of Cash Flows for the Three Months Ended September 30, 2015 and 2014 (Unaudited)	4
	Notes to Condensed Consolidated Financial Statements (Unaudited)	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	16
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	25
Item 4.	Controls and Procedures	25
Part II.	OTHER INFORMATION
Item 1.	Legal Proceedings	26
Item 1A.	Risk Factors	26
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	27
Item 3.	Defaults Upon Senior Securities	28
Item 4.	Mine Safety Disclosures	28
Item 5.	Other Information	28
Item 6.	Exhibits	29
	Signatures	30

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

ALPHA AND OMEGA SEMICONDUCTOR LIMITED
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited, in thousands except par value per share)
	September 30, 2015			June 30, 2015
ASSETS
Current assets:
Cash and cash equivalents	$	72,868		$	106,085
Restricted cash	196			368
Accounts receivable, net	37,198			38,781
Inventories	61,958			64,175
Deferred income tax assets	2,424			2,205
Other current assets	4,174			4,279
Total current assets	178,818			215,893
Property, plant and equipment, net	117,431			119,579
Intangible assets, net	16			17
Goodwill	269			269
Deferred income tax assets - long term	10,482			10,848
Other long-term assets	1,522			2,011
Total assets	$	308,538		$	348,617
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	37,689		$	44,083
Accrued liabilities	21,225			19,225
Income taxes payable	1,748			1,372
Deferred margin	714			716
Capital leases	714			941
Total current liabilities	62,090			66,337
Income taxes payable - long term	1,614			1,601
Deferred income tax liabilities	3,972			3,548
Capital leases - long term	64			64
Other long term liabilities	902			953
Total liabilities	68,642			72,503
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares, issued and outstanding: none at September 30, 2015 and June 30, 2015	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares, issued and outstanding: 27,411 shares and 22,483 shares, respectively at September 30, 2015 and 27,314 shares and 26,316 shares, respectively at June 30, 2015	55			55
Treasury shares at cost, 4,928 shares at September 30, 2015 and 998 shares at June 30, 2015	(43,833		)	(8,593		)
Additional paid-in capital	182,203			181,040
Accumulated other comprehensive income	739			905
Retained earnings	100,732			102,707
Total shareholders’ equity	239,896			276,114
Total liabilities and shareholders’ equity	$	308,538		$	348,617

See accompanying notes to these condensed consolidated financial statements.

1

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in thousands except per share data)

	Three Months Ended September 30,
	2015			2014
Revenue	$	81,439		$	88,217
Cost of goods sold	66,378			70,057
Gross profit	15,061			18,160
Operating expenses
Research and development	6,164			6,796
Selling, general and administrative	9,659			9,604
Total operating expenses	15,823			16,400
Operating income (loss)	(762		)	1,760
Interest income and other, net	11			48
Interest expense	(10		)	(73		)
Income (Loss) before income taxes	(761		)	1,735
Income tax expense	1,214			1,171
Net income (loss)	$	(1,975	)	$	564
Net income (loss) per share
Basic	$	(0.09	)	$	0.02
Diluted	$	(0.09	)	$	0.02
Weighted average number of common shares used to compute net income (loss) per share
Basic	22,698			26,385
Diluted	22,698			27,003

See accompanying notes to these condensed consolidated financial statements.

2

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited, in thousands)

	Three Months Ended September 30,
	2015			2014
Net income (loss)	$	(1,975	)	$	564
Foreign currency translation adjustment, net of tax	(166		)	(48		)
Total comprehensive income (loss)	$	(2,141	)	$	516

See accompanying notes to these condensed consolidated financial statements.

3

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in thousands)

	Three Months Ended September 30,
	2015			2014
Cash flows from operating activities
Net income (loss)	$	(1,975	)	$	564
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	6,894			6,955
Amortization	1			91
Share-based compensation expense	789			1,102
Deferred income taxes, net	571			54
Loss on disposal of property and equipment	—			22
Government grant via forgiven loan	—			(250		)
Changes in assets and liabilities:
Accounts receivable	1,583			1,469
Inventories	2,217			(1,849		)
Other current and long-term assets	595			(383		)
Accounts payable	(5,193		)	(515		)
Income taxes payable	389			472
Accrued and other liabilities	1,885			(103		)
Net cash provided by operating activities	7,756			7,629
Cash flows from investing activities
Purchases of property and equipment	(6,002		)	(2,345		)
Restricted cash released (placed)	172			(122		)
Net cash used in investing activities	(5,830		)	(2,467		)
Cash flows from financing activities
Proceeds from exercise of stock options	424			858
Payment for repurchase of common shares	(35,240		)	—
Repayments of borrowings	—			(5,714		)
Principal payments on capital leases	(227		)	(237		)
Net cash used in financing activities	(35,043		)	(5,093		)
Effect of exchange rate changes on cash and cash equivalents	(100		)	(23		)
Net increase (decrease) in cash and cash equivalents	(33,217		)	46
Cash and cash equivalents at beginning of period	106,085			117,788
Cash and cash equivalents at end of period	$	72,868		$	117,834
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	$	4,472		$	5,594

See accompanying notes to these condensed consolidated financial statements.

4

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the period presented have been included in the interim periods. Operating results for the three months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2016. The condensed consolidated balance sheet at June 30, 2015 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015.

Use of Estimates

The preparation of the condensed 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 condensed 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.

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.

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. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

5

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Recent Accounting Pronouncements

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 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. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  In July 2015, the FASB voted to amend ASU 2014-09 by approving a one-year deferral of the effective date as well as providing the option to early adopt the standard on the original effective date. In August 2015 the FASB issued ASU 2015-14, Revenue from Contracts with customers - Deferral of the Effective Date", that defers by one year the effective date of ASU 2014-09.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

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 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 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 ending 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.

6

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

2. Net Income (Loss) Per Share

The following table presents the calculation of basic and diluted net income (loss) per share:

	Three Months Ended September 30,
	2015			2014
	(in thousands, except per share data)
Numerator:
Net income (loss)	$	(1,975	)	$	564
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Diluted:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	—			618
Weighted average number of common shares used to compute diluted net income (loss) per share	22,698			27,003
Net income (loss) per share:
Basic	$	(0.09	)	$	0.02
Diluted	$	(0.09	)	$	0.02

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

	Three Months Ended September 30,
	2015	2014
	(in thousands)
Employee stock options and RSUs	3,617	2,393
ESPP to purchase common shares	188	—
Total potential dilutive securities	3,805	2,393

7

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable 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, when available.

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

	Three Months Ended September 30,
Percentage of revenue	2015		2014
Customer A	23.1	%	24.1	%
Customer B	36.0	%	39.6	%
Customer C	14.3	%	12.9	%

	September 30, 2015		June 30, 2015
Percentage of accounts receivable
Customer A	19.4	%	29.4	%
Customer B	27.3	%	27.7	%
Customer C	25.4	%	14.7	%

4. Balance Sheet Components

Accounts receivable:

	September 30, 2015			June 30, 2015
	(in thousands)
Accounts receivable	$	54,630		$	58,249
Less: Allowance for price adjustments	(17,402		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	37,198		$	38,781

Inventories:

	September 30, 2015		June 30, 2015
	(in thousands)
Raw materials	$	20,242	$	19,423
Work in-process	31,586		31,269
Finished goods	10,130		13,483
	$	61,958	$	64,175

8

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Property, plant and equipment, net:

	September 30, 2015			June 30, 2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,243			4,243
Manufacturing machinery and equipment	183,888			172,467
Equipment and tooling	11,821			11,261
Computer equipment and software	20,739			20,602
Office furniture and equipment	1,798			1,762
Leasehold improvements	27,842			27,568
	255,208			242,780
Less: Accumulated depreciation	(148,628		)	(141,883		)
	106,580			100,897
Equipment and construction in progress	10,851			18,682
Property, plant and equipment, net	$	117,431		$	119,579

Other long-term assets:

	September 30, 2015		June 30, 2015
	(in thousands)
Prepayments for property and equipment	$	76	$	692
Investment in a privately held company	100		100
Office leases deposits	1,343		1,215
Other	3		4
	$	1,522	$	2,011

Accrued liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Accrued compensation and benefit	$	6,419	$	5,600
Accrued vacation	1,828		1,830
Accrued bonuses	1,120		1,152
Warranty accrual	2,203		1,957
Stock rotation accrual	1,910		1,894
Accrued professional fees	1,420		1,402
ESPP payable	827		343
Customer deposits	611		149
Accrued inventory	699		697
Accrued facilities related expenses	1,389		1,367
Other accrued expenses	2,799		2,834
	$	21,225	$	19,225

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ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346
Additions	305			530
Utilization	(59		)	(646		)
Ending balance	$	2,203		$	1,230

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645
Additions	1,510			1,294
Utilization	(1,494		)	(1,332		)
Ending balance	$	1,910		$	1,607

Other Long-term liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Deferred rent	$	902	$	953

5. Shareholders' Equity and Share-based Compensation

Share Repurchase

On May 8, 2014, the Company's Board of Directors reactivated its existing $25.0 million share repurchase program which was originally authorized on October 22, 2010. The Board authorized management to repurchase, subject to oversight by the Board, its common shares up to remaining balance of the program, or $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. 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 Company's trading price, volume and availability of its common shares, applicable legal requirements, its 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. 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.

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

10

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 the three months ended September 30, 2015, the Company repurchased 3,930,106 shares from the open market, including 3,296,703 shares in the Tender Offer, for a total cost of $35.0 million, at an average price of $8.90 per share, excluding fees and related expenses of $0.3 million, under the share repurchase program.  Since the inception of the program in 2010, the Company repurchased an aggregate of 4,957,700 shares from the open market for a total cost of $44.0 million, at an average price of $8.87 per share, excluding fees and related expenses.  No repurchased shares have been retired. Of the 4,957,700 repurchased shares, 29,675 shares with a weighted average repurchase price of $13.84 per share, were reissued at an average price of $2.19 per share for option exercises and vested restricted share units.

Stock Options

The following table summarizes the Company's stock option activities for the three months ended September 30, 2015:

			Weighted
			Average
	Number of		Exercise Price		Aggregate
	Shares		Per Share		Intrinsic Value
Outstanding at June 30, 2015	2,836,217		$	10.77	$	1,410,538
Granted	—		$	—
Exercised	(78,453	)	$	5.41	$	219,159
Canceled or forfeited	(81,283	)	$	7.98
Outstanding at September 30, 2015	2,676,481		$	11.01	$	284,049

Information with respect to stock options outstanding and exercisable at September 30, 2015 is as follows:

	Options Outstanding				Options Vested and Exercisable
	Number Outstanding	Weighted-Average Remaining Contractual Life (years)	Weighted-Average Exercise Price		Number Exercisable	Weighted-Average Exercise Price
Total options outstanding	2,676,481	4.33	$	11.01	2,256,226	$	11.59
Options vested and expected to vest	2,636,712	4.27	$	11.06

Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

The fair value of stock options granted were estimated at the date of grant using the Black-Scholes option valuation model for the three months ended September 30, 2015 with the following weighted average assumptions:

	Three Months Ended September 30,
	2015
Volatility rate	40.13%
Risk-free interest rate	1.7%
Expected term	5.5 years
Dividend yield	0%

Historically, the Company estimates its expected volatility based on that of the publicly traded shares of industry peers over a period equivalent to the expected term of the stock awards granted. Beginning in July 2015, the Company's publicly traded shares history is also included in estimating the volatility rate.

11

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2015:

	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, 2015	873,946		$	8.64	1.77	$	7,638,288
Granted	49,690		$	7.76
Vested	(24,682	)	$	9.32
Forfeited	(53,480	)	$	8.67
Nonvested at September 30, 2015	845,474		$	8.57	1.60	$	6,586,242
RSUs vested and expected to vest	732,498				1.50	$	5,706,155

The fair value of RSU is estimated based on the market price of the Company's share on the date of grant.

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2015
Volatility rate	31.4%
Risk-free interest rate	0.1% - 0.6%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation Expense

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

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Cost of goods sold	$	131	$	154
Research and development	193		206
Selling, general and administrative	465		742
	$	789	$	1,102

Total unrecognized stock-based compensation expense as of September 30, 2015 was $4.0 million, which includes estimated forfeitures and is expected to be recognized over a weighted-average period of 1.5 years.

6. Income Taxes

The Company recognized income tax expense of approximately $1.2 million and $1.2 million for the three months ended September 30, 2015 and 2014, respectively. The estimated effective tax rate for the three months ended September 30, 2015 was (159.5)% compared to 67.5% for the three months ended September 30, 2014. The changes in the effective tax rate and tax expense between the periods resulted primarily from changes in the mix of earnings in various geographic jurisdictions between the current and same period of last year.

12

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2015 remain open to examination by U.S. federal and state tax authorities. The tax years 2009 to 2015 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. As of September 30, 2015, the gross amount of unrecognized tax benefits was approximately $6.4 million, of which $4.3 million, if recognized, would reduce the effective income tax rate in future periods. 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. The Company does not anticipate any material changes to its uncertain tax positions during the next twelve months.

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision has yet to be issued by the Tax Court due to other outstanding issues related to the case. At this time, the U.S. Department of the Treasury has not withdrawn the requirement to include stock-based compensation from its regulations. Due to the uncertainty surrounding the status of the current regulations, questions related to the scope of potential benefits, and the risk of the Tax Court’s decision being overturned upon appeal, the Company has not recorded any benefit as of September 30, 2015. The Company will continue to monitor ongoing developments and potential impacts to its financial statements.

13

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

7. 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 a 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 to which the products were shipped to:

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Hong Kong	$	70,453	$	75,247
China	9,016		10,957
South Korea	658		639
United States	717		683
Other Countries	595		691
	$	81,439	$	88,217

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Power discrete	$	59,912	$	64,891
Power IC	17,514		19,156
Packaging and testing services	4,013		4,170
	$	81,439	$	88,217

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

	September 30, 2015		June 30, 2015
	(in thousands)
China	$	70,774	$	71,618
United States	46,214		47,439
Other Countries	443		522
	$	117,431	$	119,579

14

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

8. Commitments and Contingencies

Purchase Commitments

As of September 30, 2015 and June 30, 2015, the Company had approximately $28.2 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, and approximately $0.7 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 pending material legal proceedings. The Company has 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, the Company could incur significant costs in the defense of such claims and suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it has contracted with various third 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 may be 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 has been made at September 30, 2015 and June 30, 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.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Except for the historical information contained herein, the matters addressed in this Item 2 constitute “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. Such forward-looking statements are subject to a variety of risks and uncertainties, including those discussed below under the heading “Risk Factors” and elsewhere in this Quarterly Report on Form 10-Q, that could cause actual results to differ materially from those anticipated by the Company’s management. The Private Securities Litigation Reform Act of 1995 (the “Act”) provides certain “safe harbor” provisions for forward-looking statements. All forward-looking statements made in this Quarterly Report on Form 10-Q are made pursuant to the Act. The Company undertakes no obligation to publicly release the results of any revisions to its forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unexpected events. Unless the context otherwise requires, the words “AOS,” the “Company,” “we,” “us” and “our” refer to Alpha and Omega Semiconductor Limited and its subsidiaries.

This management’s discussion should be read in conjunction with the management’s discussion included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015, filed with the Securities and Exchange Commission on August 27, 2015.

Overview

We are a designer, developer and global supplier of a broad portfolio of power semiconductors. Our portfolio of power semiconductors includes approximately 1,500 products, and has grown significantly with the introduction of over 100 new products during each of the fiscal years ended June 30, 2015, 2014 and 2013. During the three months ended September 30, 2015, we introduced an additional 24 new products. Our teams of scientists and engineers have developed extensive intellectual properties and technical knowledge that encompass major aspects of power semiconductors, which we believe 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 539 patents and 172 patent applications in the United States as of September 30, 2015. We differentiate ourselves by integrating our expertise in technology, design 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.

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 and new product introduction as well as to improve our financial performance in the long run. To meet the market demand for 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.

During the three months ended September 30, 2015, 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.

In September 2015 we entered into a preliminary agreement with the state authority of Chongqing, China, to form a joint venture for a new state-of-the-art power semiconductor manufacturing facility in the Liangjiang New Area of Chongqing. Under the proposed agreement, the initial capitalization of the joint venture is expected to be approximately $300 million. The Chongqing authority would own 49% of the venture's equity and invest in cash. We would own 51% of the equity and contribute primarily our existing assembly and testing equipment as well as certain intellectual property related to the operation of the facility. We are currently negotiating a definitive joint venture agreement with Chongqing government to provide for the specific terms of the collaboration. The joint venture offers the prospect of creating new competitive advantages that can fuel growth of our business. We expect the joint venture to deliver significant cost savings for us and allow us to reduce our tangible assets as well as drive meaningful improvements in working capital and capital expenditures.

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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 computing ("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 46.0% and 47.3% of our total revenue for the three months ended September 30, 2015 and 2014, respectively. Since the beginning of calendar year 2013, 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 executing and are continuing to execute our strategies to diversify our product portfolio and penetrate into other market segments, including the consumer, communications and industrial market segments, improve gross margin ad 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 own manufacturing facilities, pricing of wafers from other 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 in-house packaging and testing facilities and our Oregon fab.  If we are unable to utilize the capacity of our in-house manufacturing facilities at a desired level, our gross margin may be adversely affected.  For example, we may experience lower capacity utilization at our factories as a result of declining PC markets, which could adversely affect our gross margin and profitability. 

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, in the 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 the 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 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 shares with customers.

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 outlooks 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.

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Principal line items of statements of operations

The following describes the principal line items set forth in our condensed 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 market conditions, our goal is to make such rates less vulnerable to market fluctuations. We believe our market diversification strategy and product growth will drive higher volumes of manufacturing which will improve our factory utilization rates and gross margin in the long run.

Operating expenses

Our operating expenses consist of research and development, selling, general and administrative expenses. 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 markets 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 for research and development personnel. 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 markets.

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

18

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 likely than not to be realized upon settlement with a taxing authority. 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.

Results of Operations

The following tables set forth statements of operations, also expressed as a percentage of revenue, for the three months ended September 30, 2015 and 2014. Our historical results of operations are not necessarily indicative of the results for any future period.

	Three Months Ended September 30,
	2015			2014			2015		2014
	(in thousands)						(% of revenue)
Revenue	$	81,439		$	88,217		100.0	%	100.0	%
Cost of goods sold	66,378			70,057			81.5	%	79.4	%
Gross profit	15,061			18,160			18.5	%	20.6	%
Operating expenses
Research and development	6,164			6,796			7.6	%	7.7	%
Selling, general and administrative	9,659			9,604			11.9	%	10.9	%
Total operating expenses	15,823			16,400			19.5	%	18.6	%
Operating income (loss)	(762		)	1,760			(1.0	)%	2.0	%
Interest income and other, net	11			48			—	%	0.1	%
Interest expense	(10		)	(73		)	—	%	(0.1	)%
Income (Loss) before income taxes	(761		)	1,735			(1.0	)%	2.0	%
Income tax expense	1,214			1,171			1.5	%	1.3	%
Net income (loss)	$	(1,975	)	$	564		(2.5	)%	0.7	%

Share-based compensation expense was allocated as follow:

	Three Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)				(% of revenue)
Cost of goods sold	$	131	$	154	0.2	%	0.2	%
Research and development	193		206		0.2	%	0.2	%
Selling, general and administrative	465		742		0.6	%	0.8	%
Total	$	789	$	1,102	1.0	%	1.2	%

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Revenue

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2015		2014		Change
	(in thousands)				(in thousands)			(in percentage)
Power discrete	$	59,912	$	64,891	$	(4,979	)	(7.7	)%
Power IC	17,514		19,156		(1,642		)	(8.6	)%
Packaging and testing services	4,013		4,170		(157		)	(3.8	)%
	$	81,439	$	88,217	$	(6,778	)	(7.7	)%

Total revenue was $81.4 million for the three months ended September 30, 2015, an decrease of $6.8 million, or 7.7%, as compared to $88.2 million for the same period last year. The decrease primarily consisted of $5.0 million and $1.6 million in sales of power discrete products and power IC products, respectively. The decrease in power discrete and power IC products was primarily due to a 8.3% decrease in unit shipments, partially offset by a 0.6% increase in average selling price as compared to the same period of last year mainly due to a shift in product mix partially offset by selling price erosion in the computing and consumer markets. The revenue of packaging and testing services for the three months ended September 30, 2015 and 2014 remained flat.

Cost of goods sold and gross profit

	Three Months Ended September 30,
	2015			2014			Change
	(in thousands)						(in thousands)			(in percentage)
Cost of goods sold	$	66,378		$	70,057		$	(3,679	)	(5.3	)%
Percentage of revenue	81.5		%	79.4		%
Gross profit	$	15,061		$	18,160		$	(3,099	)	(17.1	)%
Percentage of revenue	18.5		%	20.6		%

Cost of goods sold was $66.4 million for the three months ended September 30, 2015, a decrease of $3.7 million, or 5.3%, as compared to $70.1 million for the same period last year, primarily due to decreased unit shipments. The decrease was partially offset by the overall manufacturing cost increase due to lower factory utilization as compared to the same period last year. Gross margin decreased by 2.1 percentage point to 18.5% for the three months ended September 30, 2015 as compared to 20.6% for the same period last year. The decrease in gross margin was primarily due to lower factory utilization partially offset by increased average selling prices and positive impact of continued cost control during the current period.

Research and development expenses

	Three Months Ended September 30,
	2015		2014		Change
	(in thousands)				(in thousands)			(in percentage)
Research and development	$	6,164	$	6,796	$	(632	)	(9.3	)%

Research and development expenses were $6.2 million for the three months ended September 30, 2015, a decrease of $0.6 million, or 9.3%, as compared to $6.8 million for the same period last year. The decrease was primarily attributable to a $0.3 million decrease in employee compensation expenses and benefits as a result of less headcount, and a $0.1 million decrease in each of facilities expenses, product prototyping engineering expense and employee business expenses as a result of continued operational and cost control effort.

Selling, general and administrative expenses

20

	Three Months Ended September 30,
	2015		2014		Change
	(in thousands)				(in thousands)		(in percentage)
Selling, general and administrative	$	9,659	$	9,604	$	55	0.6	%

Selling, general and administrative expenses were $9.7 million and $9.6 million for the three months ended September 30, 2015 and 2014, respectively. The slight increase was primarily due to a $0.2 million increase in audit and tax consulting fees due to increased related consulting activities, a $0.2 million increase in unrealized foreign exchange losses mainly due to recent appreciation of USD against RMB for current quarter over prior year same quarter, and a $0.1 million increase in employee compensation and benefits mainly due to increased headcount during the current quarter. The increase was partially offset by a $0.2 million decrease in legal expenses due to less legal consulting activities, as well as a $0.3 million decrease in share-based compensation expenses primarily as a result of increased cancellation of stock options and restricted share unit awards related to the resignation of our Vice President of Power Discrete Product Line during the current period.

Interest income and expenses

Interest income was primarily related to interest earned from cash and cash equivalents. The decrease in interest income during the three months ended September 30, 2015 as compared to the same period last year was primarily due to the decrease in average cash balances.

Interest expense was primarily related to bank borrowings. The decrease in interest expenses during the three months ended September 30, 2015 as compared to the same period last year was primarily due the $20 million term loan obtained in May 2012 for our Oregon fab was fully repaid in May 2015.

Income tax expense

	Three Months Ended September 30,
	2015		2014		Change
	(in thousands)				(in thousands)		(in percentage)
Income tax expense	$	1,214	$	1,171	$	43	3.7	%

We recognized income tax expense of approximately $1.2 million and $1.2 million for the three months ended September 30, 2015 and 2014, respectively. The income tax expense for the three months ended September 30, 2015 was slightly higher than that for the same period last year primarily due to the changes in the mix of earnings in various geographic jurisdictions between the current and same period of last year.

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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 financed our operations and capital expenditures through funds generated from operations.

On May 8, 2014, our Board of Directors approved to reactivate our existing $25.0 million share repurchase program which was originally authorized on October 22, 2010. The Board authorized management to repurchase, subject to oversight by the Board, our common shares up to remaining balance of the program, or $22.7 million. 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 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 and 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, we 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, 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.

During the three months ended September 30, 2015, we repurchased, including the Tender Offer, a total of 3,930,106 shares from the open market, including 3,296,703 common shares in the Tender Offer, for a total cost of $35.0 million, at an average price of $8.90 per share, excluding fees and related expenses of $0.3 million, under the share repurchase program.  Since the inception of the program in 2010, the Company repurchased an aggregate of 4,957,700 shares from the open market for a total cost of $44.0 million, at an average price of $8.87 per share, excluding fees and related expenses.  As of September 30, 2015, approximately $13.2 million remained available under the share repurchase program. Shares repurchased are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity.

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. 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 September 30, 2015 and June 30, 2015, we had $72.9 million and $106.1 million of cash and cash equivalents, respectively. Our cash and cash equivalents primarily consisted of cash on hand and short-term bank deposits with original maturities of three months or less.

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

22

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Net cash provided by operating activities	$	7,756		$	7,629
Net cash used in investing activities	(5,830		)	(2,467		)
Net cash used in financing activities	(35,043		)	(5,093		)
Effect of exchange rate changes on cash and cash equivalents	(100		)	(23		)
Net increase (decrease) in cash and cash equivalents	$	(33,217	)	$	46

Cash flows from operating activities

Net cash provided by operating activities of $7.8 million for the three months ended September 30, 2015 resulted primarily from net loss of $2.0 million, non-cash charges of $8.3 million, and net change in assets and liabilities providing net cash of $1.5 million. The non-cash charges of $8.3 million included a $6.9 million of depreciation and amortization expenses, a $0.8 million of share-based compensation expense, and a $0.6 million of deferred income taxes. The net change in assets and liabilities providing net cash of $1.5 million was primarily due to a $1.6 million decrease in accounts receivable due to the timing of billings and collection of payments, a $2.2 million decrease in inventories as we reduced our inventories, a $1.9 million increase in accrued and other liabilities, a $0.6 million decrease in other current and long term assets primarily due to decrease in advance payments to vendors, and a $0.4 million increase in income taxes payable, partially offset by a $5.2 million decrease in accounts payable primarily due to timing of payment.

Net cash provided by operating activities of $7.6 million for the three months ended September 30, 2014 resulted primarily from net income of $0.6 million, non-cash charges of $8.0 million, and net change in assets and liabilities using net cash of $0.9 million. The non-cash charges of $8.0 million included a $7.0 million of depreciation and amortization expenses, a $1.1 million of share-based compensation expense and a $0.1 million of net deferred income taxes, partially offset by a $0.3 million of forgiveness of the loan from the State of Oregon during the period. The net change in assets and liabilities using net cash of $0.9 million was primarily due to a $1.8 million increase in inventories as we increased our inventories to meet market demand, a $0.4 million increase in other current and long term assets primarily due to increase in advance payments to vendors, a $0.5 million decrease in accounts payable primarily due to timing of payment, and a $0.1 million decrease in accrued and other liabilities primarily related to employee contributions to ESPP, partially offset by a $1.5 million decrease in accounts receivable due to the timing of billings and collection of payments, and a $0.5 million increase in income taxes payable.

Cash flows from investing activities

Net cash used in investing activities of $5.8 million for the three months ended September 30, 2015 was primarily attributable to purchase of property and equipment of $6.0 million to increase our in-house production capacity, partially offset by $0.2 million decrease in restricted cash during the period.

Net cash used in investing activities of $2.5 million for the three months ended September 30, 2014 was primarily attributable to purchase of property and equipment of $2.3 million to increase our in-house production capacity, partially offset by $0.1 million increase in restricted cash during the period.

Cash flows from financing activities

Net cash used in financing activities of $35.0 million for the three months ended September 30, 2015 was primarily attributable to $35.2 million for repurchase of common shares, including repurchases in the Dutch tender offer, and $0.2 million in payment of capital lease obligations, partially offset by $0.4 million of proceeds from exercise of stock options.

Net cash used in financing activities of $5.1 million for the three months ended September 30, 2014 was primarily attributable to $5.7 million of repayment of our borrowings and $0.2 million in payment of capital lease obligations, partially offset by $0.9 million of proceeds from exercise of stock options.

Capital expenditures

Capital expenditures were $6.0 million and $2.3 million for the three months ended September 30, 2015 and 2014, respectively. Our capital expenditures primarily consisted of purchases of equipment for our packaging and testing services and for our Oregon fab as well as for upgrading our operational and financial systems. The increase in capital expenditure was

23

primarily due to the additional purchases of equipment and assets to improve our technology and support our new product introductions to fuel business growth.

Commitments

As of September 30, 2015 and June 30, 2015, we had approximately $28.2 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 September 30, 2015 and June 30, 2015, we had approximately $0.7 million and $3.7 million, respectively, of capital commitments for the purchase of property and equipment.

Off-Balance Sheet Arrangements

As of September 30, 2015, we had no material off-balance sheet arrangements as defined in Regulation S-K 303(a)(4)(ii) arrangements.

Recent Accounting Pronouncements

See Note 1 of the Notes to the Condensed Consolidated Financial Statements contained in this Quarterly Report on Form 10-Q for a description of recent accounting pronouncements, including the expected dates of adoption and estimated effects on results of operations and financial condition, which is incorporated herein by reference.

24

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in the market risks previously disclosed in Part II, Item 7A, "Quantitative and Qualitative Disclosures About Market Risk," of our Annual Report on Form 10-K for the year ended June 30, 2015, filed with the SEC on August 27, 2015.

ITEM 4. CONTROLS AND PROCEDURES

Management's 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 September 30, 2015 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.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting during the three months ended September 30, 2015 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Limitation on 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.

25

PART II. OTHER INFORMATION

ITEM 1. 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 its operations.

ITEM 1A. RISK FACTORS

In addition to the risk factors below, Item 1A of Part I of our Annual Report on Form 10-K for the year ended June 30, 2015, filed with the SEC on August 27, 2015, contains risk factors identified by the Company. Except for the risk factors below, there have been no material changes to the risk factors we previously disclosed. Our operations could also be affected by additional factors that are not presently known to us or by factors that we currently consider immaterial to our business.

We may not be able to successfully execute the joint venture agreement with Chongqing government, and even if such agreement is executed, we may not fully realize the anticipated benefits of the proposed joint venture.

In September 2015, we announced a preliminary agreement with the state authority of Chongqing, China, to form a joint venture for a new state-of-the-art power semiconductor manufacturing and assembly/testing facility in the Liangjiang New Area of Chongqing.  We are in the process of negotiating a definitive joint venture agreement with the Chongqing government for the proposed project.  The negotiation of a joint venture agreement requires significant efforts from our management.  There is no guarantee that we will be able to successfully negotiate such an agreement on terms favorable to us, or at all, and we may encounter difficulties and disagreements with the Chongqing government that may delay or prevent us from entering into such an agreement.  Our failure to execute a joint venture agreement in a timely manner, or at all, would adversely affect our business operations, financial performance and the trading price of our shares.

Even if we are able to enter into a definitive execute a joint venture agreement with the Chongqing government, we may not fully realize the anticipated benefits of the project, such as cost savings, improvement in working capital and gross margin, increased revenue and profitability, and enhanced market share for our products.  The joint venture is expected to require a multi-year commitment from us to gradually move our existing assembly and testing equipment from Shanghai, China to the new facility in Chongqing. In addition, at a later date, the joint venture is expected to construct a 12-inch fabrication facility suited for the production of power semiconductors.  The establishment and operation of a new manufacturing facility involves significant risks and challenges, including, but are not limited to, the following: 

• Unexpected costs or delays in transferring our assembly and testing operations to the new facility;

• 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 the 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;

• Failure of Chongqing government to meet its obligations under the joint venture agreement;

• Difficulties in protecting and enforcing our intellectual property rights;

• Inability to take advantage of the expected tax savings;

• Changes or uncertainties in economic, legal, regulatory, social and political conditions in China;

• 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.

26

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On May 8, 2014, our Board of Directors approved to reactivate our existing $25.0 million share repurchase program which was originally authorized on October 22, 2010. The Board authorized management to repurchase, subject to oversight by the Board, our common shares up to remaining balance of the program, or $22.7 million. 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 are 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 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.

The following table sets for the share repurchases under this program during the first fiscal quarter ended September 30, 2015.

Period	Total Number of Shares (or Units) Purchased			Average Price Paid per Share (or Unit)				Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs			Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Be Purchased Under the Plans or Programs
July 1, 2015 to July 31, 2015	3,415,335	(1	)	$	9.06	(1	)	3,415,335	(1	)
August 1, 2015 to August 31, 2015	247,642			$	7.54			247,642
September 1, 2015 to September 30, 2015	267,129			$	8.10			267,129
Total repurchase during the three months ended September 30, 2015	3,930,106			$	8.90			3,930,106			$	13,204,000

(1) Included 3,296,703 shares at a purchase price of $9.10 per share in the Tender Offer, and 118,632 shares at an average purchase price of $8.00 per share under the Repurchase Trading Plan.

27

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

Not applicable.

28

ITEM 6. EXHIBITS

10.1	Consulting Agreement between the Company and Tony Grizelj (incorporated by reference to Exhibit 10.1 to the Form 8-K filed on August 5, 2015.)
31.1	Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
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

29

SIGNATURES

Pursuant to the requirements 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.

November 6, 2015

ALPHA AND OMEGA SEMICONDUCTOR LIMITED
By:	/s/  YIFAN LIANG
	Yifan Liang
	Chief Financial Officer and Corporate Secretary
	(Principal Financial Officer)

30

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alpha and Omega Semiconductor Limited (the "registrant");

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: November 6, 2015

/s/    Mike F. Chang   

Mike F. Chang

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alpha and Omega Semiconductor Limited (the "registrant");

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: November 6, 2015

/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. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, 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 Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended September 30, 2015 (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: November 6, 2015

/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. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, 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 Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended September 30, 2015 (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: November 6, 2015

/s/    Yifan Liang

Yifan Liang

Chief Financial Officer and Corporate Secretary

XML

Segment and Geographic Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 117,431	$ 119,579
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	70,774	71,618
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	46,214	47,439
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 443	$ 522

XML

Shareholders' Equity and Share-based Compensation - Share-based Compensation (Details) - USD ($)	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at June 30, 2015 (in shares)	2,836,217
Granted (in shares)	0
Exercised (in shares)	(78,453)
Canceled or forfeited (in shares)	(81,283)
Outstanding at September 30, 2015 (in shares)	2,676,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at June 30, 2015 (in dollars per share)	$ 10.77
Granted (in dollars per share)	0
Exercised (in dollars per share)	5.41
Canceled or forfeited (in dollars per share)	7.98
Outstanding at September 30, 2015 (in dollars per share)	$ 11.01
Options Outstanding Aggregate Intrinsic Value	$ 284,049	$ 1,410,538
Options Exercised Aggregate Intrinsic Value	$ 219,159
Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility Rate	31.40%
Expected Term	1 year 3 months 18 days
Expected Dividend Rate	0.00%
Employee Share Purchase Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	0.10%
Employee Share Purchase Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	0.60%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility Rate	40.13%
Risk Free Interest Rate	1.70%
Expected Term	5 years 6 months
Expected Dividend Rate	0.00%

XML

Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 20,242	$ 19,423
Work in-process	31,586	31,269
Finished goods	10,130	13,483
Inventory, net	$ 61,958	$ 64,175

XML

Commitments and Contingencies - Guarantees (Details) - USD ($)	Sep. 30, 2015	Jun. 30, 2015
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnifications accrual	$ 0	$ 0

XML

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,214	$ 1,171
Estimated effective income tax rate	(159.50%)	67.50%
Unrecognized tax benefits	$ 6,400
Unrecognized tax benefit that would impact effective tax rate	$ 4,300

XML

Concentration of Credit Risk and Significant Customers

3 Months Ended

Sep. 30, 2015

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 requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable 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, when available.

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

	Three Months Ended September 30,
Percentage of revenue	2015		2014
Customer A	23.1	%	24.1	%
Customer B	36.0	%	39.6	%
Customer C	14.3	%	12.9	%

	September 30, 2015		June 30, 2015
Percentage of accounts receivable
Customer A	19.4	%	29.4	%
Customer B	27.3	%	27.7	%
Customer C	25.4	%	14.7	%

XML

Balance Sheet Components - Product Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 1,957	$ 1,346
Additions	305	530
Utilization	(59)	(646)
Ending balance	$ 2,203	$ 1,230

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Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefit	$ 6,419	$ 5,600
Accrued vacation	1,828	1,830
Accrued bonuses	1,120	1,152
Warranty accrual	2,203	1,957	$ 1,230	$ 1,346
Stock rotation accrual	1,910	1,894	$ 1,607	$ 1,645
Accrued professional fees	1,420	1,402
ESPP payable	827	343
Customer deposits	611	149
Accrued inventory	699	697
Accrued facilities related expenses	1,389	1,367
Other accrued expenses	2,799	2,834
Accrued liabilities	$ 21,225	$ 19,225

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Balance Sheet Components - Other Long Term Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Deferred rent	$ 902	$ 953
Other long term liabilities	$ 902	$ 953

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Balance Sheet Components - Stock Rotation Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Stock Rotation Accrual Increae (Decrease) [Roll Forward]
Beginning balance	$ 1,894	$ 1,645
Additions	1,510	1,294
Utilization	(1,494)	(1,332)
Ending balance	$ 1,910	$ 1,607

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Net Income (Loss) Per Share

3 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (Loss) Per Share

The following table presents the calculation of basic and diluted net income (loss) per share:

	Three Months Ended September 30,
	2015			2014
	(in thousands, except per share data)
Numerator:
Net income (loss)	$	(1,975	)	$	564
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Diluted:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	—			618
Weighted average number of common shares used to compute diluted net income (loss) per share	22,698			27,003
Net income (loss) per share:
Basic	$	(0.09	)	$	0.02
Diluted	$	(0.09	)	$	0.02

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

	Three Months Ended September 30,
	2015	2014
	(in thousands)
Employee stock options and RSUs	3,617	2,393
ESPP to purchase common shares	188	—
Total potential dilutive securities	3,805	2,393

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Shareholders' Equity and Share-based Compensation - Shares Repurchase (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	59 Months Ended
	Jul. 07, 2015	Sep. 30, 2015	Sep. 30, 2015	Jul. 08, 2015	Jun. 30, 2015	Jun. 07, 2015	Apr. 30, 2015	Mar. 31, 2015	May. 08, 2014	Oct. 22, 2010
Class of Stock [Line Items]
Share repurchase program, authorized amount (USD in Millions)										$ 25.0
Shares Repurchase Program Remaining Balance				$ 18.2			$ 50.0	$ 17.8	$ 22.7
Treasury stock acquired, shares repurchased (in shares)		3,930,106	4,957,700
Treasury Stock, Value, Acquired, Cost Method		$ 35.0	$ 44.0
Treasury stock acquired, average price per share (in dollars per share)		$ 8.90	$ 8.87
Treasury stock, Acquired, Fees and related expenses		$ 0.3
Treasury Stock, Shares, Retired			0
Treasury Stock Reissued, Average Price Per Share			$ 2.19
Treasury Stock Reissued
Class of Stock [Line Items]
Treasury stock acquired, average price per share (in dollars per share)			$ 13.84
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)			29,675
Dutch Auction Tender Offer [Member] | Common Stock [Member]
Class of Stock [Line Items]
Share repurchase program, authorized amount (USD in Millions)						$ 30.0
Treasury stock acquired, shares repurchased (in shares)	3,296,703
Treasury Stock, Value, Acquired, Cost Method	$ 30.0
Treasury Stock, Shares, Acquired, Represent Percentage Of The Company's Common Shares Issued And Outstanding					12.53%
Treasury stock acquired, average price per share (in dollars per share)	$ 9.10
Dutch Auction Tender Offer [Member] | Minimum [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Cost Per Share						$ 8.50
Dutch Auction Tender Offer [Member] | Maximum [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Cost Per Share						$ 9.20

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Segment and Geographic Information - Narratives (Details)	3 Months Ended
	Sep. 30, 2015 Segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Current assets:
Cash and cash equivalents	$ 72,868	$ 106,085
Restricted cash	196	368
Accounts receivable, net	37,198	38,781
Inventories	61,958	64,175
Deferred income tax assets	2,424	2,205
Other current assets	4,174	4,279
Total current assets	178,818	215,893
Property, plant and equipment, net	117,431	119,579
Intangible assets, net	16	17
Goodwill	269	269
Deferred income tax assets - long term	10,482	10,848
Other long-term assets	1,522	2,011
Total assets	308,538	348,617
Current liabilities:
Accounts payable	37,689	44,083
Accrued liabilities	21,225	19,225
Income taxes payable	1,748	1,372
Deferred margin	714	716
Capital leases	714	941
Total current liabilities	62,090	66,337
Income taxes payable - long term	1,614	1,601
Deferred income tax liabilities	3,972	3,548
Capital leases - long term	64	64
Other long term liabilities	902	953
Total liabilities	$ 68,642	$ 72,503
Commitments and contingencies (Note 8)
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares, issued and outstanding: none at September 30, 2015 and June 30, 2015	$ 0	$ 0
Common shares, par value $0.002 per share:
Authorized: 50,000 shares, issued and outstanding: 27,411 shares and 22,483 shares, respectively at September 30, 2015 and 27,314 shares and 26,316 shares, respectively at June 30, 2015	55	55
Treasury shares at cost, 4,928 shares at September 30, 2015 and 998 shares at June 30, 2015	(43,833)	(8,593)
Additional paid-in capital	182,203	181,040
Accumulated other comprehensive income	739	905
Retained earnings	100,732	102,707
Total shareholders’ equity	239,896	276,114
Total liabilities and shareholders’ equity	$ 308,538	$ 348,617

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income (loss)	$ (1,975)	$ 564
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	6,894	6,955
Amortization	1	91
Share-based compensation expense	789	1,102
Deferred income taxes, net	571	54
Loss on disposal of property and equipment	0	22
Government grant via forgiven loan	0	(250)
Changes in assets and liabilities:
Accounts receivable	1,583	1,469
Inventories	2,217	(1,849)
Other current and long-term assets	595	(383)
Accounts payable	(5,193)	(515)
Income taxes payable	389	472
Accrued and other liabilities	1,885	(103)
Net cash provided by operating activities	7,756	7,629
Cash flows from investing activities
Purchases of property and equipment	(6,002)	(2,345)
Restricted cash released (placed)	172	(122)
Net cash used in investing activities	(5,830)	(2,467)
Cash flows from financing activities
Proceeds from exercise of stock options	424	858
Payment for repurchase of common shares	(35,240)	0
Repayments of borrowings	0	(5,714)
Principal payments on capital leases	(227)	(237)
Net cash used in financing activities	(35,043)	(5,093)
Effect of exchange rate changes on cash and cash equivalents	(100)	(23)
Net increase (decrease) in cash and cash equivalents	(33,217)	46
Cash and cash equivalents at beginning of period	106,085	117,788
Cash and cash equivalents at end of period	72,868	117,834
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	$ 4,472	$ 5,594

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Shareholders' Equity and Share-based Compensation - Restricted Stock Activity (Details) - USD ($)	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
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 6 months 4 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at June 30, 2015	873,946
Granted	49,690
Vested	(24,682)
Forfeited	(53,480)
Nonvested at September 30, 2015	845,474	873,946
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at June 30, 2015	$ 8.64
Granted	7.76
Vested	9.32
Forfeited	8.67
Nonvested at September 30, 2015	$ 8.57	$ 8.64
Weighted Average Remaining Recognition Period (Years)	1 year 7 months 6 days	1 year 9 months 7 days
RSUs Nonvested Aggregate Intrinsic Value	$ 6,586,242	$ 7,638,288
RSUs vested and expected to vest, Outstanding (in shares)	732,498
RSUs vested and expected to vest, Weighted Average Remaining Recognition Period (in years)	1 year 6 months
RSUs vested and expected to vest, Aggregate Intrinsic Value	$ 5,706,155

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Net Income (Loss) Per Share - Potential Dilutive Shares (Details) - shares shares in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	3,805	2,393
Employee stock options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	3,617	2,393
ESPP to purchase common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	188	0

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Shareholders' Equity and Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 789	$ 1,102
Unrecognized compensation expense	$ 4,000
Recognition period of share-based compensation expense (in years)	1 year 6 months 4 days
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 131	154
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	193	206
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 465	$ 742

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Balance Sheet Components - Accounts receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 54,630	$ 58,249
Less: Allowance for price adjustments	(17,402)	(19,438)
Less: Allowance for doubtful accounts	(30)	(30)
Accounts receivable, net	$ 37,198	$ 38,781

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The Company and Significant Accounting Policies

3 Months Ended

Sep. 30, 2015

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 accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the period presented have been included in the interim periods. Operating results for the three months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2016. The condensed consolidated balance sheet at June 30, 2015 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015.

Use of Estimates

The preparation of the condensed 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 condensed 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.

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.

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. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

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 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. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  In July 2015, the FASB voted to amend ASU 2014-09 by approving a one-year deferral of the effective date as well as providing the option to early adopt the standard on the original effective date. In August 2015 the FASB issued ASU 2015-14, Revenue from Contracts with customers - Deferral of the Effective Date", that defers by one year the effective date of ASU 2014-09.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

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 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 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 ending 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.

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2015	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)	27,411,000	27,314,000
Common stock, shares outstanding (in shares)	22,483,000	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)	4,928,000	998,000

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Concentration of Credit Risk and Significant Customers (Tables)

3 Months Ended

Sep. 30, 2015

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:

	Three Months Ended September 30,
Percentage of revenue	2015		2014
Customer A	23.1	%	24.1	%
Customer B	36.0	%	39.6	%
Customer C	14.3	%	12.9	%

	September 30, 2015		June 30, 2015
Percentage of accounts receivable
Customer A	19.4	%	29.4	%
Customer B	27.3	%	27.7	%
Customer C	25.4	%	14.7	%

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Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2015	Oct. 31, 2015
Document and Entity Information [Abstract]
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-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		22,200,060

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Balance Sheet Components (Tables)

3 Months Ended

Sep. 30, 2015

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable:

	September 30, 2015			June 30, 2015
	(in thousands)
Accounts receivable	$	54,630		$	58,249
Less: Allowance for price adjustments	(17,402		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	37,198		$	38,781

Schedule of Inventory, Current

Inventories:

	September 30, 2015		June 30, 2015
	(in thousands)
Raw materials	$	20,242	$	19,423
Work in-process	31,586		31,269
Finished goods	10,130		13,483
	$	61,958	$	64,175

Property, Plant and Equipment

Property, plant and equipment, net:

	September 30, 2015			June 30, 2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,243			4,243
Manufacturing machinery and equipment	183,888			172,467
Equipment and tooling	11,821			11,261
Computer equipment and software	20,739			20,602
Office furniture and equipment	1,798			1,762
Leasehold improvements	27,842			27,568
	255,208			242,780
Less: Accumulated depreciation	(148,628		)	(141,883		)
	106,580			100,897
Equipment and construction in progress	10,851			18,682
Property, plant and equipment, net	$	117,431		$	119,579

Schedule of Other Assets, Noncurrent

Other long-term assets:

	September 30, 2015		June 30, 2015
	(in thousands)
Prepayments for property and equipment	$	76	$	692
Investment in a privately held company	100		100
Office leases deposits	1,343		1,215
Other	3		4
	$	1,522	$	2,011

Schedule of Accrued Liabilities

Accrued liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Accrued compensation and benefit	$	6,419	$	5,600
Accrued vacation	1,828		1,830
Accrued bonuses	1,120		1,152
Warranty accrual	2,203		1,957
Stock rotation accrual	1,910		1,894
Accrued professional fees	1,420		1,402
ESPP payable	827		343
Customer deposits	611		149
Accrued inventory	699		697
Accrued facilities related expenses	1,389		1,367
Other accrued expenses	2,799		2,834
	$	21,225	$	19,225

Schedule of Product Warranty Liability

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346
Additions	305			530
Utilization	(59		)	(646		)
Ending balance	$	2,203		$	1,230

Stock Rotation Accrual

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645
Additions	1,510			1,294
Utilization	(1,494		)	(1,332		)
Ending balance	$	1,910		$	1,607

Schedule of Other Noncurrent Liabilities

Other Long-term liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Deferred rent	$	902	$	953

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Revenue	$ 81,439	$ 88,217
Cost of goods sold	66,378	70,057
Gross profit	15,061	18,160
Operating expenses
Research and development	6,164	6,796
Selling, general and administrative	9,659	9,604
Total operating expenses	15,823	16,400
Operating income (loss)	(762)	1,760
Interest income and other, net	11	48
Interest expense	(10)	(73)
Income (Loss) before income taxes	(761)	1,735
Income tax expense	1,214	1,171
Net income (loss)	$ (1,975)	$ 564
Net income (loss) per share
Basic (in dollars per share)	$ (0.09)	$ 0.02
Diluted (in dollars per share)	$ (0.09)	$ 0.02
Weighted average number of common shares used to compute net income (loss) per share
Basic (in shares)	22,698	26,385
Diluted (in shares)	22,698	27,003

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Income Taxes

3 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company recognized income tax expense of approximately $1.2 million and $1.2 million for the three months ended September 30, 2015 and 2014, respectively. The estimated effective tax rate for the three months ended September 30, 2015 was (159.5)% compared to 67.5% for the three months ended September 30, 2014. The changes in the effective tax rate and tax expense between the periods resulted primarily from changes in the mix of earnings in various geographic jurisdictions between the current and same period of last year.

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2015 remain open to examination by U.S. federal and state tax authorities. The tax years 2009 to 2015 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. As of September 30, 2015, the gross amount of unrecognized tax benefits was approximately $6.4 million, of which $4.3 million, if recognized, would reduce the effective income tax rate in future periods. 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. The Company does not anticipate any material changes to its uncertain tax positions during the next twelve months.

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision has yet to be issued by the Tax Court due to other outstanding issues related to the case. At this time, the U.S. Department of the Treasury has not withdrawn the requirement to include stock-based compensation from its regulations. Due to the uncertainty surrounding the status of the current regulations, questions related to the scope of potential benefits, and the risk of the Tax Court’s decision being overturned upon appeal, the Company has not recorded any benefit as of September 30, 2015. The Company will continue to monitor ongoing developments and potential impacts to its financial statements.

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Shareholders' Equity and Share-based Compensation

3 Months Ended

Sep. 30, 2015

Share-based Compensation [Abstract]

Shareholders' Equity and Share-based Compensation

Shareholders' Equity and Share-based Compensation

Share Repurchase

On May 8, 2014, the Company's Board of Directors reactivated its existing $25.0 million share repurchase program which was originally authorized on October 22, 2010. The Board authorized management to repurchase, subject to oversight by the Board, its common shares up to remaining balance of the program, or $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. 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 Company's trading price, volume and availability of its common shares, applicable legal requirements, its 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. 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.

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 the three months ended September 30, 2015, the Company repurchased 3,930,106 shares from the open market, including 3,296,703 shares in the Tender Offer, for a total cost of $35.0 million, at an average price of $8.90 per share, excluding fees and related expenses of $0.3 million, under the share repurchase program.  Since the inception of the program in 2010, the Company repurchased an aggregate of 4,957,700 shares from the open market for a total cost of $44.0 million, at an average price of $8.87 per share, excluding fees and related expenses.  No repurchased shares have been retired. Of the 4,957,700 repurchased shares, 29,675 shares with a weighted average repurchase price of $13.84 per share, were reissued at an average price of $2.19 per share for option exercises and vested restricted share units.

Stock Options

The following table summarizes the Company's stock option activities for the three months ended September 30, 2015:

			Weighted
			Average
	Number of		Exercise Price		Aggregate
	Shares		Per Share		Intrinsic Value
Outstanding at June 30, 2015	2,836,217		$	10.77	$	1,410,538
Granted	—		$	—
Exercised	(78,453	)	$	5.41	$	219,159
Canceled or forfeited	(81,283	)	$	7.98
Outstanding at September 30, 2015	2,676,481		$	11.01	$	284,049

Information with respect to stock options outstanding and exercisable at September 30, 2015 is as follows:

	Options Outstanding				Options Vested and Exercisable
	Number Outstanding	Weighted-Average Remaining Contractual Life (years)	Weighted-Average Exercise Price		Number Exercisable	Weighted-Average Exercise Price
Total options outstanding	2,676,481	4.33	$	11.01	2,256,226	$	11.59
Options vested and expected to vest	2,636,712	4.27	$	11.06

Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

The fair value of stock options granted were estimated at the date of grant using the Black-Scholes option valuation model for the three months ended September 30, 2015 with the following weighted average assumptions:

	Three Months Ended September 30,
	2015
Volatility rate	40.13%
Risk-free interest rate	1.7%
Expected term	5.5 years
Dividend yield	0%

Historically, the Company estimates its expected volatility based on that of the publicly traded shares of industry peers over a period equivalent to the expected term of the stock awards granted. Beginning in July 2015, the Company's publicly traded shares history is also included in estimating the volatility rate.

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2015:

	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, 2015	873,946		$	8.64	1.77	$	7,638,288
Granted	49,690		$	7.76
Vested	(24,682	)	$	9.32
Forfeited	(53,480	)	$	8.67
Nonvested at September 30, 2015	845,474		$	8.57	1.60	$	6,586,242
RSUs vested and expected to vest	732,498				1.50	$	5,706,155

The fair value of RSU is estimated based on the market price of the Company's share on the date of grant.

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2015
Volatility rate	31.4%
Risk-free interest rate	0.1% - 0.6%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation Expense

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

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Cost of goods sold	$	131	$	154
Research and development	193		206
Selling, general and administrative	465		742
	$	789	$	1,102

Total unrecognized stock-based compensation expense as of September 30, 2015 was $4.0 million, which includes estimated forfeitures and is expected to be recognized over a weighted-average period of 1.5 years.

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Concentration of Credit Risk and Significant Customers - (Details)	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 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 | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	23.10%		24.10%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	19.40%	29.40%
Customer B | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	36.00%		39.60%
Customer B | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	27.30%	27.70%
Customer C | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	14.30%		12.90%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	25.40%	14.70%

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Shareholders' Equity and Share-based Compensation (Tables)

3 Months Ended

Sep. 30, 2015

Share-based Compensation [Abstract]

Summary of Stock Option Activities

Stock Options

The following table summarizes the Company's stock option activities for the three months ended September 30, 2015:

			Weighted
			Average
	Number of		Exercise Price		Aggregate
	Shares		Per Share		Intrinsic Value
Outstanding at June 30, 2015	2,836,217		$	10.77	$	1,410,538
Granted	—		$	—
Exercised	(78,453	)	$	5.41	$	219,159
Canceled or forfeited	(81,283	)	$	7.98
Outstanding at September 30, 2015	2,676,481		$	11.01	$	284,049

Information with respect to stock options outstanding and exercisable at September 30, 2015 is as follows:

	Options Outstanding				Options Vested and Exercisable
	Number Outstanding	Weighted-Average Remaining Contractual Life (years)	Weighted-Average Exercise Price		Number Exercisable	Weighted-Average Exercise Price
Total options outstanding	2,676,481	4.33	$	11.01	2,256,226	$	11.59
Options vested and expected to vest	2,636,712	4.27	$	11.06

Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of stock options granted were estimated at the date of grant using the Black-Scholes option valuation model for the three months ended September 30, 2015 with the following weighted average assumptions:

	Three Months Ended September 30,
	2015
Volatility rate	40.13%
Risk-free interest rate	1.7%
Expected term	5.5 years
Dividend yield	0%

Restricted Stock Units Activity

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2015:

	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, 2015	873,946		$	8.64	1.77	$	7,638,288
Granted	49,690		$	7.76
Vested	(24,682	)	$	9.32
Forfeited	(53,480	)	$	8.67
Nonvested at September 30, 2015	845,474		$	8.57	1.60	$	6,586,242
RSUs vested and expected to vest	732,498				1.50	$	5,706,155

The fair value of RSU is estimated based on the market price of the Company's share on the date of grant.

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2015
Volatility rate	31.4%
Risk-free interest rate	0.1% - 0.6%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation, Allocation of Recognized Period Costs

Share-based Compensation Expense

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

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Cost of goods sold	$	131	$	154
Research and development	193		206
Selling, general and administrative	465		742
	$	789	$	1,102

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The Company and Significant Accounting Policies (Policies)

3 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Concentration Risk, Credit Risk, Policy [Policy Text Block]

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 requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable 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, when available.

Basis of Preparation

Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the period presented have been included in the interim periods. Operating results for the three months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2016. The condensed consolidated balance sheet at June 30, 2015 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2015.

Use of Estimates

Use of Estimates

The preparation of the condensed 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 condensed 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.

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.

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. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

Recent Accounting Pronouncements

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 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. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  In July 2015, the FASB voted to amend ASU 2014-09 by approving a one-year deferral of the effective date as well as providing the option to early adopt the standard on the original effective date. In August 2015 the FASB issued ASU 2015-14, Revenue from Contracts with customers - Deferral of the Effective Date", that defers by one year the effective date of ASU 2014-09.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period.  The Company is in the process of evaluating the timing of its adoption and the impact of adoption on its consolidated financial statements.

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 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 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 ending 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.

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Segment and Geographic Information

3 Months Ended

Sep. 30, 2015

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 a 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 to which the products were shipped to:

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Hong Kong	$	70,453	$	75,247
China	9,016		10,957
South Korea	658		639
United States	717		683
Other Countries	595		691
	$	81,439	$	88,217

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Power discrete	$	59,912	$	64,891
Power IC	17,514		19,156
Packaging and testing services	4,013		4,170
	$	81,439	$	88,217

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

	September 30, 2015		June 30, 2015
	(in thousands)
China	$	70,774	$	71,618
United States	46,214		47,439
Other Countries	443		522
	$	117,431	$	119,579

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Commitments and Contingencies

3 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Purchase Commitments

As of September 30, 2015 and June 30, 2015, the Company had approximately $28.2 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, and approximately $0.7 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 pending material legal proceedings. The Company has 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, the Company could incur significant costs in the defense of such claims and suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it has contracted with various third 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 may be 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 has been made at September 30, 2015 and June 30, 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.

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Net Income (Loss) Per Share (Tables)

3 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted net income (loss) per share:

	Three Months Ended September 30,
	2015			2014
	(in thousands, except per share data)
Numerator:
Net income (loss)	$	(1,975	)	$	564
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Diluted:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698			26,385
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	—			618
Weighted average number of common shares used to compute diluted net income (loss) per share	22,698			27,003
Net income (loss) per share:
Basic	$	(0.09	)	$	0.02
Diluted	$	(0.09	)	$	0.02

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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

	Three Months Ended September 30,
	2015	2014
	(in thousands)
Employee stock options and RSUs	3,617	2,393
ESPP to purchase common shares	188	—
Total potential dilutive securities	3,805	2,393

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Shareholders' Equity and Share-based Compensation - Stock Options Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Share-based Compensation [Abstract]
Options, Number Outstanding (in shares)	2,676,481	2,836,217
Options, Weighted-Average Remaining Contractual Life (in years)	4 years 3 months 29 days
Options, Weighted-Average Exercise Price (in dollars per share)	$ 11.01	$ 10.77
Options, Number Exercisable (in shares)	2,256,226
Options, Weighted-Average Exercise Price (in dollars per share)	$ 11.59
Options vested and expected to vest, Number Outstanding (in shares)	2,636,712
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	4 years 3 months 7 days
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 11.06

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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	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income (loss)	$ (1,975)	$ 564
Basic:
Weighted average number of common shares used to compute basic net income (loss) per share	22,698	26,385
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	618
Effect of potentially dilutive securities:
Weighted average number of common shares used to compute diluted net income (loss) per share	22,698	27,003
Net income (loss) per share:
Basic (in dollars per share)	$ (0.09)	$ 0.02
Diluted (in dollars per share)	$ (0.09)	$ 0.02

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Balance Sheet Components - Property, plant, and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 255,208	$ 242,780
Less: Accumulated depreciation	(148,628)	(141,883)
Property, plant and equipment excluding equipment and construction in progress, net	106,580	100,897
Equipment and construction in progress	10,851	18,682
Property, plant and equipment, net	117,431	119,579
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,877	4,877
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,243	4,243
Manufacturing machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	183,888	172,467
Equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	11,821	11,261
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	20,739	20,602
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	1,798	1,762
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 27,842	$ 27,568

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Commitments and Contingencies - Purchase Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Raw materials, wafers, and packaging and testing services puchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 28.2	$ 29.2
Property and equipment purchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 0.7	$ 3.7

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net income (loss)	$ (1,975)	$ 564
Foreign currency translation adjustment, net of tax	(166)	(48)
Total comprehensive income (loss)	$ (2,141)	$ 516

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Balance Sheet Components

3 Months Ended

Sep. 30, 2015

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Balance Sheet Components

Accounts receivable:

	September 30, 2015			June 30, 2015
	(in thousands)
Accounts receivable	$	54,630		$	58,249
Less: Allowance for price adjustments	(17,402		)	(19,438		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	37,198		$	38,781

Inventories:

	September 30, 2015		June 30, 2015
	(in thousands)
Raw materials	$	20,242	$	19,423
Work in-process	31,586		31,269
Finished goods	10,130		13,483
	$	61,958	$	64,175

Property, plant and equipment, net:

	September 30, 2015			June 30, 2015
	(in thousands)
Land	$	4,877		$	4,877
Building	4,243			4,243
Manufacturing machinery and equipment	183,888			172,467
Equipment and tooling	11,821			11,261
Computer equipment and software	20,739			20,602
Office furniture and equipment	1,798			1,762
Leasehold improvements	27,842			27,568
	255,208			242,780
Less: Accumulated depreciation	(148,628		)	(141,883		)
	106,580			100,897
Equipment and construction in progress	10,851			18,682
Property, plant and equipment, net	$	117,431		$	119,579

Other long-term assets:

	September 30, 2015		June 30, 2015
	(in thousands)
Prepayments for property and equipment	$	76	$	692
Investment in a privately held company	100		100
Office leases deposits	1,343		1,215
Other	3		4
	$	1,522	$	2,011

Accrued liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Accrued compensation and benefit	$	6,419	$	5,600
Accrued vacation	1,828		1,830
Accrued bonuses	1,120		1,152
Warranty accrual	2,203		1,957
Stock rotation accrual	1,910		1,894
Accrued professional fees	1,420		1,402
ESPP payable	827		343
Customer deposits	611		149
Accrued inventory	699		697
Accrued facilities related expenses	1,389		1,367
Other accrued expenses	2,799		2,834
	$	21,225	$	19,225

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,957		$	1,346
Additions	305			530
Utilization	(59		)	(646		)
Ending balance	$	2,203		$	1,230

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2015			2014
	(in thousands)
Beginning balance	$	1,894		$	1,645
Additions	1,510			1,294
Utilization	(1,494		)	(1,332		)
Ending balance	$	1,910		$	1,607

Other Long-term liabilities:

	September 30, 2015		June 30, 2015
	(in thousands)
Deferred rent	$	902	$	953

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Balance Sheet Components - Other long term assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Balance Sheet Related Disclosures [Abstract]
Prepayments for property and equipment	$ 76	$ 692
Investment in a privately held company	100	100
Office leases deposits	1,343	1,215
Other Assets, Miscellaneous, Noncurrent	3	4
Other long-term assets	$ 1,522	$ 2,011

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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 81,439	$ 88,217
Power discrete
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	59,912	64,891
Power IC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,514	19,156
Packaging and testing services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,013	4,170
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	70,453	75,247
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	9,016	10,957
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	658	639
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	717	683
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 595	$ 691

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Segment and Geographic Information (Tables)

3 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

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

	September 30, 2015		June 30, 2015
	(in thousands)
China	$	70,774	$	71,618
United States	46,214		47,439
Other Countries	443		522
	$	117,431	$	119,579

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

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Hong Kong	$	70,453	$	75,247
China	9,016		10,957
South Korea	658		639
United States	717		683
Other Countries	595		691
	$	81,439	$	88,217

Revenue from External Customers by Products and Services

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2015		2014
	(in thousands)
Power discrete	$	59,912	$	64,891
Power IC	17,514		19,156
Packaging and testing services	4,013		4,170
	$	81,439	$	88,217