10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the Quarterly Period Ended March 29, 2013

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Commission File No. 000-25826

HARMONIC INC.

(Exact name of registrant as specified in its charter)

Delaware	77-0201147
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

4300 North First Street

San Jose, CA 95134

(408) 542-2500

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

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  ¨

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 during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

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

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	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  ¨    No  x

The number of shares of the registrant’s Common Stock, $.001 par value, outstanding on April 19, 2013 was 113,262,063.

TABLE OF CONTENTS

PART I
ITEM 1. FINANCIAL STATEMENTS (UNAUDITED)	3
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	21
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	28
ITEM 4. CONTROLS AND PROCEDURES	29
PART II
ITEM 1. LEGAL PROCEEDINGS	30
ITEM 1A. RISK FACTORS	30
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	50
ITEM 3. DEFAULTS UPON SENIOR SECURITIES	50
ITEM 4. MINE SAFETY DISCLOSURES	50
ITEM 5. OTHER INFORMATION	50
ITEM 6. EXHIBITS	51
SIGNATURES	52

2

PART I

FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

HARMONIC INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	March 29, 2013			December 31, 2012
	(In thousands, except par value amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	118,464		$	96,670
Short-term investments		109,790			104,506
Accounts receivable, net		95,692			85,920
Inventories		46,385			64,270
Deferred income taxes		20,145			21,870
Prepaid expenses and other current assets		28,977			23,636
Total current assets		419,453			396,872
Property and equipment, net		37,201			38,122
Goodwill		197,820			212,518
Intangibles, net		51,414			58,447
Other assets		9,256			11,572
Total assets	$	715,144		$	717,531
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	22,815		$	25,447
Income taxes payable		—			1,797
Deferred revenue		31,575			33,235
Accrued liabilities		42,294			42,415
Total current liabilities		96,684			102,894
Income taxes payable, long-term		50,669			49,309
Other non-current liabilities		11,732			11,915
Total liabilities		159,085			164,118
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding		—			—
Common stock, $0.001 par value, 150,000 shares authorized; 114,336 and 114,193 shares issued and outstanding at March 29, 2013 and December 31, 2012, respectively		114			114
Additional paid-in capital		2,429,631			2,432,790
Accumulated deficit		(1,872,605	)		(1,879,026	)
Accumulated other comprehensive loss		(1,081	)		(465	)
Total stockholders’ equity		556,059			553,413
Total liabilities and stockholders’ equity	$	715,144		$	717,531

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

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HARMONIC INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except per share amounts)
Product revenue	$	82,475		$	99,498
Service revenue		19,197			16,941
Net revenue		101,672			116,439
Product cost of revenue		45,237			59,176
Service cost of revenue		10,270			6,801
Total cost of revenue		55,507			65,977
Gross profit		46,165			50,462
Operating expenses:
Research and development		25,251			26,763
Selling, general and administrative		33,269			31,403
Amortization of intangibles		2,088			2,179
Restructuring and related charges		424			—
Total operating expenses		61,032			60,345
Loss from operations		(14,867	)		(9,883	)
Interest income, net		64			119
Other income (expense), net		(167	)		403
Loss from continuing operations before income taxes		(14,970	)		(9,361	)
Benefit from income taxes		(5,467	)		(626	)
Loss from continuing operations		(9,503	)		(8,735	)
Income from discontinued operations, net of tax (including gain on disposal of $14,956, net of tax, for the three months ended March 29, 2013)		15,924			1,207
Net Income (loss)	$	6,421		$	(7,528	)
Basic net income (loss) per share from:
Continuing operations	$	(0.08	)	$	(0.07	)
Discontinued operations	$	0.14		$	0.01
Net Income (loss)	$	0.06		$	(0.06	)
Diluted net income (loss) per share from:
Continuing operations	$	(0.08	)	$	(0.07	)
Discontinued operations	$	0.14		$	0.01
Net Income (loss)	$	0.06		$	(0.06	)
Shares used in per share calculation:
Basic		115,219			117,275
Diluted		115,219			117,275

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

4

HARMONIC INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(UNAUDITED)

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands)
Net income (loss)	$	6,421		$	(7,528	)
Other comprehensive income (loss), net of tax:
Changes in cumulative translation adjustments		(624	)		314
Foreign currency translation adjustments		(624	)		314
Changes in unrealized gain (loss) on investment arising during the period		5			39
Gain on investments		5			39
Other comprehensive (loss) income before tax		(619	)		353
Income tax (benefit) provision related to items of other comprehensive income (loss)		(3	)		15
Other comprehensive income (loss), net of tax		(616	)		338
Comprehensive income (loss)	$	5,805		$	(7,190	)

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

5

HARMONIC INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands)
Cash flows from operating activities:
Net income (loss)	$	6,421		$	(7,528	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles		7,033			7,539
Depreciation		4,040			3,798
Stock-based compensation		3,986			4,800
Gain on sale of discontinued operations, net of tax		(14,956	)		—
Loss on impairment of fixed assets		101			—
Deferred income taxes		(204	)		(1,262	)
Provision for inventories		567			784
Allowance for doubtful accounts, returns and discounts		1,116			(180	)
Excess tax benefits from stock-based compensation		—			(73	)
Other non-cash adjustments, net		408			(8	)
Changes in assets and liabilities:
Accounts receivable		(10,888	)		(1,683	)
Inventories		6,832			4,320
Prepaid expenses and other assets		(8,597	)		1,892
Accounts payable		(2,796	)		936
Deferred revenue		2,667			2,740
Income taxes payable		(1,257	)		(929	)
Accrued and other liabilities		(216	)		(7,255	)
Net cash (used in) provided by operating activities		(5,743	)		7,891
Cash flows from investing activities:
Purchases of investments		(25,908	)		(36,654	)
Proceeds from maturities of investments		16,249			18,791
Proceeds from sales of investments		4,000			1,042
Acquisition of property and equipment		(4,274	)		(3,715	)
Proceeds from sale of discontinued operations, net of selling costs		44,336			—
Net cash provided by (used in) investing activities		34,403			(20,536	)
Cash flows from financing activities:
Payments for repurchase of common stock		(9,268	)		—
Proceeds from issuance of common stock, net		2,508			2,479
Excess tax benefits from stock-based compensation		—			73
Net cash (used in) provided by financing activities		(6,760	)		2,552
Effect of exchange rate changes on cash and cash equivalents		(106	)		129
Net increase (decrease) in cash and cash equivalents		21,794			(9,964	)
Cash and cash equivalents at beginning of period		96,670			90,983
Cash and cash equivalents at end of period	$	118,464		$	81,019

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

6

HARMONIC INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1: BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation. The accompanying unaudited condensed consolidated financial statements, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) which Harmonic Inc. (“Harmonic,” or the “Company”) considers necessary for a fair statement of the results of operations for the interim periods covered and the consolidated financial condition of the Company at the date of the balance sheets. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K, which was filed with the Securities and Exchange Commission on March 1, 2013 (“2012 Form 10-K”). The interim results presented herein are not necessarily indicative of the results of operations that may be expected for the full fiscal year ending December 31, 2013, or any other future period. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter which ends on December 31.

The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The year-end condensed balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“US GAAP”).

Discontinued Operations. On March 5, 2013, the Company completed the sale of its cable access HFC business to Aurora Networks (“Aurora”) for $46.0 million in cash. The Consolidated Statements of Operations have been retrospectively adjusted to present the cable access HFC business as discontinued operations, as described in “Note 3 Discontinued Operations”. Unless noted otherwise, all discussions herein with respect to the Company’s unaudited condensed consolidated financial statements relate to the Company’s continuing operations.

Use of Estimates. The preparation of the consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.

Significant Accounting Policies. The Company’s significant accounting policies are described in Note 2 to its audited Consolidated Financial Statements included in its 2012 Form 10-K. There have been no significant changes to these policies during the three months ended March 29, 2013.

Reclassifications. From time to time the Company reclassifies certain prior period balances to conform to the current year presentation. These reclassifications have no material impact on previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.

NOTE 2: RECENT ACCOUNTING PRONOUNCEMENTS

In December 2011, the FASB issued Accounting Standard Update (“ASU”) 2011-11, “Disclosures about offsetting assets and liabilities”. This guidance enhances disclosure requirements about the nature of an entity’s right to offset. The new guidance requires the disclosure of the gross amounts subject to rights of set-off, amounts offset in accordance with the accounting standards followed, and the related net exposure. The new guidance became effective for the Company beginning in the first quarter of fiscal 2013 and it did not have any impact on the Company’s Consolidated Financial Statements.

In July 2012, the FASB issued ASU 2012-2, “Intangibles - Goodwill and Other”, which allows an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived asset is impaired for determining whether it is necessary to perform the quantitative impairment test. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013, and it did not have any impact on the Company’s Consolidated Financial Statements.

7

In February 2013, the FASB issued ASU 2013-2, “Comprehensive Income”, which requires reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. The Company adopted this new guidance in the first quarter of 2013 and included the required disclosures.

In March 2013, the FASB issued ASU 2013-4, “Obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date”. The update provides requirements for the recognition, measurement and disclosure of an entity’s reasonable expectation of its obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. This guidance requires an entity to disclose the nature and amount of any such obligation as well as other information about the obligation. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-04 will have a material impact on its financial position, results of operations or cash flows.

On March 5, 2013, the FASB issued ASU 2013-05, “Parent’s Accounting for the Cumulative Translation Adjustment upon De-recognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity”. The ASU addresses accounting for a cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-05 will have a material impact on its financial position, results of operations or cash flows.

NOTE 3: DISCONTINUED OPERATIONS

On February 18, 2013, the Company entered into an Asset Purchase Agreement with Aurora pursuant to which the Company agreed to sell its cable access HFC business for $46.0 million in cash. On March 5, 2013, the sale transaction closed and the Company received gross proceeds of $46.0 million from the sale and recorded a net gain of $15.0 million in connection with the sale.

In accordance with ASC 205 “Presentation of financial statements – Discontinued Operations”, a business is classified as a discontinued operation when : (i) the operations and cash flows of the business can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the business has either been disposed of or is classified as held for sale; and (iii) the Company will not have any significant continuing involvement in the operations of the business after the disposal transactions.

On March 5, 2013, the Company entered into a transition service agreement (‘TSA”) with Aurora to provide contract manufacturing for up to five months and other various support, including providing order fulfillment, taking warranty calls, attending to product returns from customers, providing cost accounting analysis, receiving payments from customers and remitting such payments to Aurora for up to two months. The TSA fees are a fixed amount per month and were determined based on the Company’s estimated cost of delivering the transition services. In addition, on April 24, 2013, the Company and Aurora signed a sublease agreement for the Company’s Milpitas warehouse for the remaining period of the lease. The Company determined that the cash flows generated from these transactions are both insignificant and are considered indirect cash flows. As a result, the sale of the cable access HFC business is appropriately presented as discontinued operations. The TSA billing to Aurora in the three months ended March 29, 2013 totaled $328,000, and it was recorded in the Consolidated Statements of Operations under income from continuing operations as an offset to the expenses incurred to deliver the transition services. The table below provides details on the income statement caption under which the TSA billing was recorded (in thousands):

	Three months ended
	March 29, 2013
Product cost of revenue	$	175
Research and development		9
Selling, general and administrative		144
Total TSA billing to Aurora	$	328

Included within the “Prepaid expenses and other current assets” ending balance at March 29, 2013 on the Consolidated Balance Sheet is $1.7 million due from Aurora for purchases made on Aurora’s behalf and $3.0 million in receivables from customers invoiced on Aurora’s behalf. Included within the “Accrued liabilities” ending balance at March 29, 2013 is $1.4 million payable to third party vendors for purchases made on Aurora’s behalf and $2.9 million due to Aurora primarily for invoicing to customers made on Aurora’s behalf.

8

The Company recorded a gain of $15.0 million in connection with the sale of the cable access HFC business, calculated as follows (in thousands):

Gross Proceeds				$	46,000
Less : carrying value of net assets
Inventories, net	$	10,487
Prepaid expenses and other current assets		612
Property and equipment, net		1,133
Goodwill de-recognized		14,547
Deferred revenue		(4,499	)
Accrued liabilities		(939	)
Total net assets sold and de-recognized				$	21,341
Less : selling cost				$	2,469
Less : Tax effect				$	7,234
Gain on disposal, net of tax				$	14,956

Since the Company has one reporting unit, upon the sale of the cable access HFC business, approximately $14.5 million of the carrying value of goodwill was allocated to the cable access HFC business based on the relative fair value of the cable access HFC business to the fair value of the Company. The remaining carrying value of goodwill as of March 29, 2013 was tested for impairment, and the Company determined that goodwill was not impaired as of March 29, 2013.

The results of operations associated with the cable access HFC business are presented as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. Revenue and the components of net income related to the discontinued operations for the three months ended March 29, 2013 and March 30, 2012 were as follows:

	Three months ended
	March 29, 2013			March 30, 2012
Revenue	$	9,556		$	11,282
Operating income	$	834		$	1,226
Less: (Benefit from) provision for income taxes		(134	)		19
Add: Gain on disposal, net of tax		14,956			—
Income from discontinued operations, net of taxes	$	15,924		$	1,207

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NOTE 4: SHORT-TERM INVESTMENTS

The following table summarizes the Company’s short-term investments (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of March 29, 2013
Certificates of deposit	$	1,605	$	—	$	—		$	1,605
State, municipal and local government agencies bonds		59,137		56		(2	)		59,191
Corporate bonds		31,062		7		(22	)		31,047
Commercial paper		9,944		—		—			9,944
U.S. federal government bonds		8,003		1		(1	)		8,003
Total short-term investments	$	109,751	$	64	$	(25	)	$	109,790
As of December 31, 2012
Certificates of deposit	$	1,603	$	—	$	—		$	1,603
State, municipal and local government agencies bonds		59,009		45		(4	)		59,050
Corporate bonds		31,568		4		(10	)		31,562
Commercial paper		10,287		1		—			10,288
U.S. federal government bonds		2,003		—		—			2,003
Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506

The following table summarizes the maturities of the Company’s short-term investments (in thousands):

	March 29, 2013		December 31, 2012
Less than one year	$	84,402	$	76,779
Due in 1 - 2 years		25,388		27,727
Total short-term investments	$	109,790	$	104,506

Realized gains and losses from the sale of investments for the three months ended March 29, 2013 and March 30, 2012 were not material.

Impairment of Investments. The Company monitors its investment portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. A decline of fair value below amortized costs of debt securities is considered other-than temporary if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. At the present time, the Company does not intend to sell its investments that have unrealized losses in accumulated other comprehensive loss. In addition, the Company does not believe that it is more likely than not that it will be required to sell its investments that have unrealized losses in accumulated other comprehensive loss before the Company recovers the principal amounts invested. The Company believes that the unrealized losses are temporary and do not require an-other-than-temporary impairment, based on its evaluation of available evidence as of March 29, 2013.

As of March 29, 2013, there were no individual available-for-sale securities in a material unrealized loss position and the amount of unrealized losses on the total investment balance was insignificant.

NOTE 5: FAIR VALUE MEASUREMENTS

The applicable accounting guidance establishes a framework for measuring fair value and requires disclosure about the fair value measurements of assets and liabilities. This guidance requires the Company to classify and disclose assets and liabilities measured at fair value on a recurring basis, as well as fair value measurements of assets and liabilities measured on a nonrecurring basis in periods subsequent to initial measurement, in a three-tier fair value hierarchy as described below.

The guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants on the measurement date.

Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.

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• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company primarily uses broker quotes for valuation of its short-term investments. The forward exchange contracts are classified as Level 2 because they are valued using quoted market prices and other observable data for similar instruments in an active market.

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

The Company uses the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. During the three months ended March 29, 2013, there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value as of March 29, 2013 and December 31, 2012, based on the three-tier fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3		Total
As of March 29, 2013
Cash equivalents
Money market funds	$	62,370	$	—	$	—	$	62,370
U.S. federal government bonds with maturity less than 90 days		2,002		—		—		2,002
Short-term investments
Certificates of deposit		—		1,605		—		1,605
State, municipal and local government agencies bonds		—		59,191		—		59,191
Corporate bonds		—		31,047		—		31,047
Commercial paper		—		9,944		—		9,944
U.S. federal government bonds		8,003		—		—		8,003
Prepaids and other current assets
Foreign exchange forward contracts		—		735		—		735
Total assets measured and recorded at fair value	$	72,375	$	102,522	$	—	$	174,897
Accrued liabilities
Foreign exchange forward contracts	$	—	$	63	$	—	$	63
Total liabilities measured and recorded at fair value	$	—	$	63	$	—	$	63
	Level 1		Level 2		Level 3		Total
As of December 31, 2012
Cash equivalents
Money market funds	$	54,923	$	—	$	—	$	54,923
Corporate bonds with maturity less than 90 days		—		3,614		—		3,614
U.S. federal government bonds with maturity less than 90 days		3,005		—		—		3,005
Short-term investments
Certificates of deposit		—		1,603		—		1,603
State, municipal and local government agencies bonds		—		59,050		—		59,050
Corporate bonds		—		31,562		—		31,562
Commercial paper		—		10,288		—		10,288
U.S. federal government bonds		2,003		—		—		2,003
Prepaids and other current assets
Foreign exchange forward contracts		—		344		—		344
Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
Accrued liabilities
Foreign exchange forward contracts	$	—	$	143	$	—	$	143
Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143

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NOTE 6: BALANCE SHEET COMPONENTS

The following tables provide details of selected balance sheet components (in thousands):

	March 29, 2013			December 31, 2012
Accounts receivable, net
Accounts receivable	$	105,497		$	95,515
Less: allowances for doubtful accounts, returns and discounts		(9,805	)		(9,595	)
	$	95,692		$	85,920
Inventories:
Raw materials	$	4,579		$	10,731
Work-in-process		2,850			4,347
Finished goods		38,956			49,192
	$	46,385		$	64,270
Property and equipment, net:
Furniture and fixtures	$	7,902		$	7,856
Machinery and equipment		105,499			108,262
Leasehold improvements		7,387			7,612
		120,788			123,730
Less: accumulated depreciation and amortization		(83,587	)		(85,608	)
	$	37,201		$	38,122

NOTE 7: GOODWILL AND IDENTIFIED INTANGIBLE ASSETS

The changes in the carrying amount of goodwill for the three months ended March 29, 2013 are as follows (in thousands):

Balance at beginning of period	$	212,518
Reduction in goodwill associated with the sale of the cable access HFC Business		(14,547	)
Foreign currency translation adjustment		(151	)
Balance at end of period	$	197,820

The following is a summary of identified intangible assets (in thousands):

	March 29, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Identifiable intangibles:
Developed core technology	$	136,145	$	(107,394	)	$	28,751	$	136,145	$	(102,449	)	$	33,696
Customer relationships/contracts		67,098		(49,580	)		17,518		67,098		(48,150	)		18,948
Trademarks and tradenames		11,361		(9,500	)		1,861		11,361		(9,145	)		2,216
Maintenance agreements and related relationships		7,100		(3,816	)		3,284		7,100		(3,513	)		3,587
Total identifiable intangibles	$	221,704	$	(170,290	)	$	51,414	$	221,704	$	(163,257	)	$	58,447

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Amortization expense for the identifiable purchased intangible assets for the three months ended March 29, 2013 and March 30, 2012 was allocated as follows (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Included in cost of revenue	$	4,945	$	5,360
Included in operating expenses		2,088		2,179
Total amortization expense	$	7,033	$	7,539

The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):

	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2013 (remaining 9 months)	$	14,288	$	6,008	$	20,296
2014		13,745		6,775		20,520
2105		719		5,783		6,502
2016		—		4,096		4,096
2017		—		—		—
Total future amortization expense	$	28,752	$	22,662	$	51,414

NOTE 8: RESTRUCTURING AND RELATED CHARGES

Omneon Restructuring. The Company has restructuring accruals for excess lease facilities related to the closure of the Omneon headquarters in Sunnyvale, California. The accrual was based on future rent payments, net of expected sublease income, to be made through the end of the lease term in June 2013. The following table summarizes the activity in the Omneon restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Excess Facilities
Balance at December 31, 2012	$	869
Cash payments		(455	)
Accretion		20
Balance at March 29, 2013		434

HFC Restructuring. As a result of the sale of the cable access HFC business in March 2013, the Company recorded a $0.4 million restructuring charge, which was recorded under “Income from discontinued operations”. The restructuring charge was for $0.3 million of severance and benefits related to involuntary termination of nine employees and $0.1 million of contract termination costs. Three of the terminated employees are required to work to the end of the term of the Aurora TSA, and, therefore, the Company records their severance ratably over the service period. The following table summarizes the activity in the HFC restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Contract termination		Total
Balance at December 31, 2012	$	—		$	—	$	—
Restructuring charges in discontinued operations		243			124		367
Cash payments		(165	)		—		(165	)
Balance at March 29, 2013		78			124		202

The Company anticipates that the remaining restructuring accrual balance of $0.2 million will be paid out by the end of its third quarter of fiscal 2013. In addition, if Aurora elects to terminate any of the U.S. employees hired from the Company, on or before September 5, 2013, the Company has agreed to reimburse Aurora for the severance payments payable to such employees.

Harmonic Q1’13 Restructuring. The Company implemented a series of restructuring plans in the first quarter of fiscal 2013 to reduce costs and improve efficiencies. As a result, the Company recorded a restructuring charge of $0.6 million, of which $0.2 million is included in “Product cost of

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revenue” and $0.4 million is included in “Operating expenses-restructuring and related charges” in the Consolidated Statements of Operations. The restructuring charge consisted of severance and benefits of $0.5 million related to the involuntary termination of thirty employees. In addition, the Company wrote–down, to its estimated net realizable value, leasehold improvements related to the Milpitas warehouse by $0.1 million. The following table summarizes the activity in the Harmonic Q1’13 restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Impairment of Leasehold improvement			Total
Balance at December 31, 2012	$	—		$	—		$	—
Restructuring charges in continuing operations		464			101			565
Cash payments		(247	)		—			(247	)
Non-cash write-offs		—			(101	)		(101	)
Balance at March 29, 2013		217			—			217

The Company anticipates that the remaining restructuring accrual balance of $0.2 million will be paid out by the end of its third quarter of fiscal 2013.

NOTE 9: CREDIT FACILITIES

Harmonic has a bank line of credit facility with Silicon Valley Bank, which provides for borrowings of up to $10.0 million and matures on August 23, 2013. As of March 29, 2013, other than standby letters of credit and guarantees (Note 14), there were no amounts outstanding under the line of credit facility, and there were no borrowings during the three months ended March 29, 2013. This facility, which became effective in August 2011 and was amended in August 2012, contains a financial covenant that requires Harmonic to maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00. As of March 29, 2013, the Company’s ratio under that covenant was 4.97 to 1. In the event of noncompliance by Harmonic with the covenants under the facility, including the financial covenant referenced above, Silicon Valley Bank would be entitled to exercise its remedies under the facility, including declaring all obligations immediately due and payable. At March 29, 2013, Harmonic was in compliance with the covenants under the line of credit facility. Borrowings pursuant to the line would bear interest at the bank’s prime rate (3.25% at March 29, 2013) or at LIBOR for the desired borrowing period (an annualized rate of 0.20% for a one month borrowing period at March 29, 2013) plus 1.75%, or 1.95%. Borrowings are not collateralized.

NOTE 10: EMPLOYEE BENEFIT PLANS

Harmonic grants stock options and restricted stock units (“RSUs”) pursuant to stockholder approved equity incentive plans. These equity incentive plans are described in detail in Note 13, Employee Benefit Plans, of Notes to Consolidated Financial Statements in the 2012 Form 10-K

Stock Options and Restricted Stock Units. The following table summarizes the Company’s stock option and RSU unit activity during the three months ended March 29, 2013 (in thousands, except per share amounts):

				Stock Options Outstanding					Restricted Stock Units Outstanding
	Shares Available for Grant			Number of Shares			Weighted Average Exercise Price		Number of Units			Weighted Average Grant Date Fair Value
Balance at December 31, 2012		10,155			8,900		$	6.83		3,938		$	6.44
Authorized		—			—			—		—			—
Granted		(2,914	)		1,251			5.77		1,109			5.75
Options exercised		—			(191	)		2.95		—			—
Shares released		—			—			—		(918	)		6.06
Forfeited or cancelled		944			(630	)		6.18		(213	)		6.82
Balance at March 29, 2013		8,185			9,330		$	6.81		3,916		$	6.32

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The following table summarizes information about stock options outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Vested and expected to vest		9,071	$	6.83		3.4	$	3,053
Exercisable		6,518		7.17		2.4		2,187

The intrinsic value of options vested and expected to vest and exercisable as of March 29, 2013 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of March 29, 2013. The intrinsic value of options exercised during the three months ended March 29, 2013 was $0.5 million and is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of the exercise date.

The following table summarizes information about restricted stock units outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares Underlying Restricted Stock Units		Weighted Average Remaining Vesting Period (Years)		Aggregate Fair Value (1)
Vested and expected to vest		3,622		1.2	$	20,972

(1) Represents the fair value of the Company’s common stock as of March 29, 2013, times the number of restricted stock units vested and expected to vest as of the same date.

401-K Plan. Harmonic has a retirement/savings plan which qualifies as a thrift plan under Section 401(k) of the Internal Revenue Code. This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Prior to 2009, Harmonic made discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Harmonic’s contributions were suspended from 2009 through 2012, but have been renewed, on the same basis, for 2013.

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NOTE 11: STOCK-BASED COMPENSATION

Stock-based compensation expense consists primarily of expenses for stock options and restricted stock units granted to employees and shares issued under the Employee Stock Purchase Plan. The following table summarizes stock-based compensation expense (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Stock-based compensation in:
Cost of revenue	$	611	$	753
Research and development expense		1,203		1,655
Selling, general and administrative expense		2,085		2,259
Total stock-based compensation in operating expense		3,288		3,914
Total stock-based compensation	$	3,899	$	4,667

Stock Options. The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		4.70			4.70
Volatility		52	%		58	%
Risk-free interest rate		0.8	%		1.0	%
Expected dividends		0.0	%		0.0	%

The expected term represents the weighted-average period that the stock options are expected to remain outstanding. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.

The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods.

The weighted-average fair value per share of options granted for the three months ended March 29, 2013 and March 30, 2012 was $2.50 and $2.94 per share, respectively. The fair value of all stock options vested during the three months ended March 29, 2013 and March 30, 2012 was $1.3 million and $2.1 million, respectively.

The total realized tax benefit attributable to stock options exercised during the three months ended March 30, 2012, in jurisdictions where this expense is deductible for tax purposes, was $0.1 million. The Company did not recognize any tax benefit attributable to stock options exercised during the three months ended March 29, 2013.

Restricted Stock Units. The estimated fair value of restricted stock units is based on the market price of the Company’s common stock on the grant date. The fair value of all restricted stock units issued during the three months ended March 29, 2013 and March 30, 2012 was $5.6 million and $5.4 million, respectively.

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Employee Stock Purchase Plan. The value of the stock purchase rights under the Company’s Employee Stock Purchase Plan (“ESPP”) consists of: (1) the 15% discount on the purchase of the stock; (2) 85% of the fair value of the call option; and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		0.49			0.50
Volatility		32	%		53	%
Risk-free interest rate		0.2	%		0.2	%
Expected dividends		0.0	%		0.0	%

The expected term represents the period of time from the beginning of the offering period to the purchase date. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.

The weighted-average fair value per share of stock purchase rights under the ESPP granted for the three months ended March 29, 2013 and March 30, 2012 was $1.20 and $1.50, respectively.

Unrecognized Stock-Based Compensation. As of March 29, 2013, total unamortized stock-based compensation cost related to unvested stock options and restricted stock units was $28.2 million. This amount will be recognized as expense using the straight-line attribution method over the remaining weighted-average amortization period of 2.3 years.

NOTE 12: INCOME TAXES

The income tax provision includes federal, state and local, and foreign income taxes and is based on the application of a forecasted annual income tax rate applied to the current quarter’s year-to-date pre-tax income (loss). In determining the estimated annual effective income tax rate, the Company estimates the annual impact of certain factors, including projections of the Company’s annual earnings, taxing jurisdictions in which the earnings will be generated, state and local income taxes, the Company’s ability to use tax credits and net operating loss carryforwards, and available tax planning alternatives. Discrete items, including the effect of changes in tax laws, tax rates, and certain circumstances with respect to valuation allowances or other unusual or non-recurring tax adjustments, are reflected in the period in which they occur as an addition to, or reduction from, the income tax provision, rather than being included in the estimated annual effective income tax rate.

For the three months ended March 29, 2013, the Company recorded a benefit from income taxes of $5.5 million, compared to a benefit from income taxes of $0.6 million for the same period a year ago, inclusive of discrete items. The increase in the benefit from income taxes in the three months ended March 29, 2013, compared to the same period in 2012, was primarily attributable to the reinstatement of the federal R&D tax credit retroactively from January 1, 2012, and an increase in loss from continuing operations in the three months ended March 29, 2013, compared to the same period in 2012.

For the three months ended March 29, 2013, the difference between the recorded benefit from income taxes and the tax provision, based on the federal statutory rate of 35%, was primarily attributable to the net of various discrete items, the differential in foreign tax rates, non-deductible stock-based compensation expense and non-deductible amortization on foreign intangibles, and federal R&D credits. The discrete items recorded in the first three months of 2013 primarily related to the increase in the valuation allowance on California R&D tax credits, the reinstatement of the federal R&D tax credit, and accrued interest on uncertain tax positions.

For the three months ended March 30, 2012, the difference between the recorded benefit from income taxes and the tax provision, based on the federal statutory rate of 35%, was primarily attributable to the net of various discrete items, the differential in foreign tax rates, non-deductible stock-based compensation expense, and non-deductible amortization on foreign intangibles. The discrete items recorded in the first three months of 2012 related to accrued interest on uncertain tax positions, and foreign currency translation adjustments.

The Company files federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations during which such tax returns may be audited and adjusted by the relevant tax authorities. The 2008 through 2012 tax years generally remain subject to examination by federal and most state tax authorities. In significant foreign jurisdictions, the 2006 through 2012 tax years generally

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remain subject to examination by their respective tax authorities. The Company is under audit by the US Internal Revenue Service for the 2008, 2009 and 2010 tax years. In addition, the statute of limitations on our 2008 and 2009 U.S. corporate income tax return has been extended to September 2013. A subsidiary of the Company is under an audit, which commenced in the first quarter of 2012, by the Israel tax authority for the years 2007 through 2010. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the U.S. or Israel is for an amount in excess of the tax provision we have recorded in the applicable period, our overall tax expense, effective tax rate, operating results and cash flow could be materially and adversely impacted in the period of adjustment.

In compliance with applicable guidance for accounting for uncertainty in income taxes, the Company had gross unrecognized tax benefits, which include interest and penalties, of approximately $59.2 million as of December 31, 2012, and approximately $60.8 million as of March 29, 2013. If all of these unrecognized tax benefits were recognized, the entire amount would impact the provision for income taxes. The unrecognized tax benefits may decrease significantly within the next 12 months if related statutes of limitation that are to expire during that period are not extended.

The Company recognizes interest and possible penalties related to uncertain tax positions in income tax expense. During the three months ended March 29, 2013, the Company recorded a net increase of $0.6 million for interest and possible penalties related to uncertain tax positions, resulting in a balance at March 29, 2013 of $7.7 million.

NOTE 13: INCOME (LOSS) PER SHARE

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts):

	Three months ended
	March 29, 2013			March 30, 2012
Numerator:
Loss from continuing operations	$	(9,503	)	$	(8,735	)
Income from discontinued operations		15,924			1,207
Net income (loss)	$	6,421		$	(7,528	)
Denominator:
Basic and diluted weighted average number of shares outstanding		115,219			117,275
Basic and diluted net income (loss) per share from:
Continuing operations	$	(0.08	)	$	(0.07	)
Discontinued operations		0.14			0.01
Net Income (loss)	$	0.06		$	(0.06	)

The following table sets forth the potentially dilutive shares from stock options, restricted stock units and the ESPP, for the periods presented, that were excluded from the net income (loss) per share computations because their effect was anti-dilutive (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Potentially dilutive equity awards outstanding		13,131		10,209

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NOTE 14: COMMITMENTS AND CONTINGENCIES

Leases

Future minimum lease payments under non-cancelable operating leases at March 29, 2013, after giving effect to $0.6 million of future sublease income from Aurora, are as follows (in thousands):

Years ending December 31,
2013 (remaining nine months)	$	7,616
2014		7,495
2015		7,042
2016		7,235
2017		7,360
Thereafter		20,398
Total	$	57,146

Warranties

The Company accrues for estimated warranty costs at the time of product shipment. Management periodically reviews the estimated fair value of its warranty liability and records adjustments based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims. Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):

	Three months ended
	March 29, 2013			March 30, 2012
Balance at beginning of period	$	4,292		$	5,558
Transfer to Aurora as part of the sale of discontinued operations		(939	)		—
Accrual for current period warranties		1,394			1,619
Warranty costs incurred		(1,477	)		(2,044	)
Balance at end of period	$	3,270		$	5,133

Purchase Commitments with Contract Manufacturers and Other Suppliers

The Company relies on a limited number of contract manufacturers and suppliers to provide manufacturing services for a substantial majority of its products. In addition, some components, sub-assemblies and modules are obtained from a sole supplier or limited group of suppliers. During the normal course of business, in order to reduce manufacturing lead times and ensure adequate component supply, the Company enters into agreements with certain contract manufacturers and suppliers that allow them to procure inventory based upon criteria as defined by the Company. The Company had approximately $19.7 million of non-cancelable purchase commitments with contract manufacturers and other suppliers as of March 29, 2013. This amount does not include $5.5 million of non-cancelable purchase commitments with contract manufacturers and other suppliers on Aurora’s behalf. In the event Aurora were to default on its obligations to reimburse the Company for inventory purchased on its behalf, the Company would continue to be obligated to the vendors from which it purchased the inventory and, accordingly, its operating results, financial condition and cash flow could be materially and adversely affected.

Standby Letters of Credit

As of March 29, 2013, the Company’s financial guarantees consisted of standby letters of credit outstanding, which were principally related to performance bonds and state requirements imposed on employers. The maximum amount of potential future payments under these arrangements was $0.4 million as of March 29, 2013.

Indemnification

Harmonic is obligated to indemnify its officers and the members of its Board of Directors pursuant to its bylaws and contractual indemnity agreements. Harmonic also indemnifies some of its suppliers and most of its customers for specified intellectual property matters pursuant to certain contractual arrangements, subject to certain limitations. The scope of these indemnities varies, but, in some instances, includes indemnification for damages and expenses (including reasonable attorneys’ fees). There have been no amounts accrued in respect of these indemnification provisions through March 29, 2013.

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Guarantees

The Company has $0.5 million of guarantees in Israel, with the majority related to rent for buildings used by its Israeli subsidiaries, as of March 29, 2013.

Legal proceedings

In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages.

On November 14, 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent.

At this time, the Company cannot predict the outcome of the above matters.

An unfavorable outcome on the Avid matters or the FastVDO matter referenced above or any other litigation matter could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of such matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

Harmonic’s industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. From time to time, third parties have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or the Company’s customers. Such assertions arise in the normal course of the Company’s operations. The resolution of any such assertions and claims cannot be predicted with certainty.

NOTE 15: STOCKHOLDERS’ EQUITY

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss were as follows (in thousands):

	March 29, 2013			December 31, 2012
Foreign currency translation adjustments	$	(1,126	)	$	(502	)
Unrealized gain on investments		45			37
Accumulated Other Comprehensive Loss	$	(1,081	)	$	(465	)

Common Stock Repurchases

On January 28, 2013, our Board of Directors approved a $75 million increase to our existing $25 million stock repurchase program. On February 19, 2013, the Board approved a further $35 million increase to the program upon the closing of a sale of the Company’s cable access HFC business, which closed on March 5, 2013. The Board authorized aggregate repurchases under the program of $135 million, approximately $31.9 million of which had been utilized for repurchases as of March 29, 2013. Under the program, we are authorized to repurchase shares of common stock in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing and actual number of shares repurchased, if any, depends on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The program may be suspended or discontinued at any time without prior notice.

During the three months ended March 29, 2013, the Company repurchased and retired approximately 1.6 million shares of common stock at an average price of $5.76 per share, for an aggregate purchase prices of approximately $9.3 million, leaving approximately $103.1 million available for purchases under the program as of March 29, 2013. The Company charges the excess of cost over par value for the repurchase of its common stock to additional paid-in capital.

NOTE 16: SUBSEQUENT EVENTS

On April 22, 2013, the Company announced that it expected to commence a modified “Dutch Auction” tender offer to purchase up to $100.0 million of its common stock at a price per share not less than $5.75 and not greater than $6.25. The tender offer commenced on April 26, 2013, and will expire on May 24, 2013, unless extended. The minimum number of shares that may be purchased in the tender offer represents approximately 14.1% of Harmonic’s currently outstanding common stock. Until the expiration of the tender offer, the Company has suspended its previously announced stock repurchase program.

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

The terms “Harmonic,” the “Company,” “we,” “us,” “its,” and “our,” as used in this Quarterly Report on Form 10-Q (“Form 10-Q”), refer to Harmonic Inc. and its subsidiaries and its predecessors as a combined entity, except where the context requires otherwise.

Some of the statements contained in this Form 10-Q are forward-looking statements that involve risk and uncertainties. The statements contained in this Form 10-Q that are not purely historical are 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, including, without limitation, statements regarding our expectations, beliefs, intentions or strategies regarding the future. In some cases, you can identify forward-looking statements by terminology such as, “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “intends,” “estimates,” “predicts,” “potential,” or “continue” or the negative of these terms or other comparable terminology. These forward-looking statements include, but are not limited to, statements regarding:

• developing trends and demands in the markets we address, particularly emerging markets;

• the potential impact of our announced tender offer;

• new and future products and services;

• capital spending of our customers in 2013;

• our strategic direction, future business plans and growth strategy;

• industry and customer consolidation;

• anticipated changes in economic conditions, particularly in certain geographies, and in financial markets;

• the expected demand for and benefits of our products and services;

• seasonality of revenue and concentration of revenue sources;

• anticipated benefits of acquisitions;

• potential future acquisitions and dispositions;

• anticipated results of potential or actual litigation;

• our competitive environment;

• the impact of governmental regulation;

• the impact of uncertain economic times and markets;

• anticipated revenue and expenses, including the sources of such revenue and expenses;

• expected impacts of changes in accounting rules;

• use of cash, cash needs and ability to raise capital; and

• the condition of our cash investments.

These statements are subject to known and unknown risks, uncertainties and other factors, any of which may cause our actual results to differ materially from those implied by the forward-looking statements. Important factors that may cause actual results to differ from expectations include those discussed in “Risk Factors” beginning on page 30 of this Form 10-Q. All forward-looking statements included in this Form 10-Q are based on information available to us on the date thereof, and we assume no obligation to update any such forward-looking statements.

OVERVIEW

We design, manufacture and sell versatile and high performance video infrastructure products and system solutions. We enable our customers to efficiently create, prepare and deliver a full range of video services to consumer devices, including televisions, personal computers, tablets and mobile phones. Our products generally fall into three principal categories; video production platforms and playout solutions, video processing solutions and cable edge solutions. We also provide technical support services and professional services to our customers worldwide.

The principal markets we serve are cable television, direct broadcast satellite system companies, telecommunications companies, or “telcos”, broadcasters and media companies, as well as, more recently, the emerging streaming media providers, that create video programming or offer video-based infrastructure. Historically, a majority of our revenue has been derived from relatively few customers, due in part to the consolidation of the ownership of cable television and direct broadcast satellite system companies. Sales to our ten largest customers in the three months ended March 29, 2013 accounted for approximately 35% of our revenue, compared to 38% for the same period in 2012.

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Although we are attempting to broaden our customer base by penetrating new markets and further expanding internationally, we expect to see continuing industry consolidation and customer concentration. No customers accounted for more than 10% of net revenue during the three months ended March 29, 2013 and the three months ended March 30, 2012.

In the three months ended March 29, 2013, we recognized revenue of $102 million compared to $116 million in the same period in 2012. Our international sales, which had been growing at a faster pace than our domestic sales in prior periods, represented 58% of our total revenue compared to 52% of our total revenue in the same period in 2012. Domestic sales decreased by 25% in the three months ended March 29, 2013, as compared to the same period in 2012. Notwithstanding the substantially reduced market activity in Europe that we experienced in 2012, as compared to 2011, we expect that international sales will continue to account for a significant portion of our net revenue for the foreseeable future, and expect that, due to sales to emerging markets in particular, our international revenue may increase as a percentage of our total net revenue from year to year.

Historically, our revenue has been dependent upon capital spending in the cable, satellite, telco and broadcast industries. More recently, we also have derived revenue from media companies, including streaming media providers. Industry consolidation has in the past constrained, and may in the future constrain, capital spending by our customers. If our product portfolio and product development plans do not position us well to capture an increased portion of the capital spending of customers in the markets on which we focus, our revenue may decline. As we attempt to further diversify our customer base in these markets, we may need to continue to build alliances with other equipment manufacturers and content providers, adapt our products for new applications, take orders at prices resulting in lower margins, and build internal expertise to handle the particular contractual and technical demands of the media market, which could result in higher operating costs. Implementation issues with our products or those of other vendors have caused in the past, and may cause in the future, delays in project completion for our customers and delay our recognition of revenue.

Our quarterly revenue has been, and may continue to be, affected by seasonal buying patterns. Typically, revenue in the first quarter of the year is seasonally lower than other quarters, as our customers often are still finalizing their annual budget and capital spending projections for the year. Further, we often recognize a substantial portion of our quarterly revenues in the last month of the quarter. We establish our expenditure levels for product development and other operating expenses based on projected revenue levels for a specified period, and expenses are relatively fixed in the short term. Accordingly, even small variations in timing of revenue, particularly from large individual transactions, can cause significant fluctuations in operating results in a particular quarter.

The impact of economic conditions on certain of our customers and changes in our customers’ deployment plans have adversely affected our business in the past. In 2010, economic conditions in many of the countries in which we sell products were very weak, and global economic conditions and financial markets experienced a severe downturn. The downturn stemmed from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Although there was an increase in global economic activity in the second half of 2010 and the first half of 2011, economic growth appears to have become sluggish in some geographies since the middle of 2011, and weak in other geographies, particularly in Europe, since the beginning of 2012. If an economic downturn were to occur in the future, customers may delay or reduce capital expenditures, which, in turn, often results in lower demand for our products.

As part of our business strategy, (1) from time to time we have acquired, and continue to consider acquiring, businesses, technologies, assets and product lines that we believe complement or may expand our existing business, and (2) from time to time we consider divesting a product line that we believe may no longer complement or expand our existing business. In September 2010, we completed the acquisition of Omneon, Inc., a company specializing in file-based infrastructure for the production, preparation and playout of video content typically deployed by broadcasters, satellite operators, content owners and other media companies. Omneon’s business was complementary to Harmonic’s core business, and expanded our customer reach into content providers and extended our product lines into video servers and video-optimized storage for content production and playout. On February 18, 2013, we entered into an agreement to sell our cable access HFC business to Aurora Networks, and the transaction closed on March 5, 2013. See Note 3, “Discontinued Operations” of our Consolidated Financial Statements.

CRITICAL ACCOUNTING POLICIES, JUDGMENTS AND ESTIMATES

There have been no material changes to our critical accounting policies, judgments and estimates during the three months ended March 29, 2013, from those disclosed in our 2012 Form 10-K.

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RESULTS OF OPERATIONS

Net Revenue

Net Revenue by Product Line

Harmonic’s consolidated net revenue, by product line, for the three months ended March 29, 2013, compared to the same period in 2012, are presented in the table below. Also presented are the related dollar and percentage change in consolidated net revenue, by product line, in the three months ended March 29, 2013, as compared to the same period in 2012.

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Revenue by type:
Video processing products	$	42,906		$	52,681
Production and playout products		22,230			20,878
Cable edge products		17,339			25,939
Service and support		19,197			16,941
Net revenue	$	101,672		$	116,439
Increase (Decrease):
Video processing products	$	(9,775	)
Production and playout products		1,352
Cable edge products		(8,600	)
Service and support		2,256
Total decrease	$	(14,767	)
Percent change:
Video processing products		(19	)%
Production and playout products		6
Cable edge products		(33	)
Service and support		13
Total percent change		(13	)%

The decrease in net revenue in the three months ended March 29, 2013, compared to the same period in 2012, was primarily due to a reduction in demand for video processing products and cable edge products, primarily in the U.S., and, to a lesser extent, in the Central Americas and Latin America region (“CALA”) and, the Europe, Middle East and Africa region (“EMEA”), offset, in part, by an increase in demand for production and playout products in EMEA and an increase in service and support revenue.

Net Revenue by Geographic Region

Harmonic’s domestic and international net revenue in the three months ended March 29, 2013, compared with the corresponding period in 2012, are presented in the table below. Also presented are the related dollar and percentage change in domestic and international net revenue in the three months ended March 29, 2013, from the corresponding period in 2012.

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	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Net revenue:
United States	$	42,350		$	56,218
International		59,322			60,221
Total	$	101,672		$	116,439
Decrease:
United States	$	(13,868	)
International		(899	)
Total decrease	$	(14,767	)
Percent change:
United States		(25	)%
International		(1	)
Total percent change		(13	)%

The decrease in U.S. net revenue in the three months ended March 29, 2013, compared to the corresponding period in 2012, was principally due to decreased demand for our video processing products and cable edge products. US PayTV service providers demand continues to be soft, as some providers appear to be looking ahead to new technology cycles.

International net revenue in the three months ended March 29, 2013 decreased, compared to the corresponding period in 2012, primarily due to decreased demand from customers in CALA, offset, in part, by increased demand in Asia Pacific and EMEA. We expect that international sales will continue to account for a significant percentage of our net revenue for the foreseeable future.

Gross Profit

Harmonic’s gross profit and gross profit as a percentage of net revenue in the three months ended March 29, 2013, as compared to the corresponding period in 2012, are presented in the table below. Also presented are the related dollar and percentage changes in gross profit in the three months ended March 29, 2013, from the corresponding period in 2012.

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Gross profit	$	46,165		$	50,462
As a percentage of net revenue		45	%		43	%
Decrease	$	(4,297	)
Percent change		(9	)%

The decrease in gross profit in the three month ended March 29, 2013, as compared to the corresponding period in 2012, was primarily due to a change in product mix and the decrease in net revenue between the two quarters. In the three months ended March 29, 2013, $4.9 million of amortization of intangibles was included in cost of revenue, compared to $5.4 million in the corresponding period in 2012.

Research and Development

Harmonic’s research and development expense and the expense as a percentage of net revenue in the three months ended March 29, 2013, as compared with the corresponding period in 2012, are presented in the table below. Also presented are the related dollar and percentage changes in research and development expense in the three months ended March 29, 2013, from the corresponding period in 2012.

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	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Research and development	$	25,251		$	26,763
As a percentage of net revenue		25	%		23	%
Decrease	$	(1,512	)
Percent change		(6	)%

The decrease of $1.5 million in research and development expense in the three months ended March 29, 2013, compared to the corresponding period in 2012, was primarily the result of decreased employee compensation expense of $0.6 million, mainly due to reduction in headcount, decreased stock-based compensation of $0.5 million, and a decrease of $0.3 million in expenditures on prototype materials.

Selling, General and Administrative

Harmonic’s selling, general and administrative expense, and the expense as a percentage of net revenue in the three months ended March 29, 2013, as compared with the corresponding period in 2012, are presented in the table below. Also presented are the related dollar and percentage change in selling, general and administrative expense in the three months ended March 29, 2013, from the corresponding period in 2012.

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Selling, general and administrative	$	33,269		$	31,403
As a percentage of net revenue		33	%		27	%
Increase	$	1,866
Percent change		6	%

The increase of $1.9 million in selling, general and administrative expenses for the three months ended March 29, 2013, compared to the corresponding period of 2012, was primarily the result of increased professional legal fees of $0.6 million, driven mainly by the legal proceedings with Avid Technology, increased employee compensation expense of $0.5 million due to an increase in headcount, increased sales commission expense of $0.4 million, mainly due to a new commission plan in 2013, and increased tradeshow and related marketing expenses of $0.4 million.

Amortization of Intangibles

Harmonic’s amortization of intangible assets charged to operating expenses, and the amortization of intangible assets as a percentage of net revenue, in the three months ended March 29, 2013, as compared with the corresponding period in 2012, are presented in the table below. Also presented are the related dollar and percentage changes in amortization of intangible assets in the three months ended March 29, 2013, from the corresponding period in 2012.

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Amortization of intangibles	$	2,088		$	2,179
As a percentage of net revenue		2	%		2	%
Decrease	$	(91	)
Percent change		(4	)%

The decrease in amortization of intangibles expense in the three months ended March 29, 2013, compared to the corresponding period in 2012, was primarily due to certain purchased intangible assets becoming fully amortized.

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Restructuring and related charges

The Company implemented a series of restructuring plans in the first quarter of fiscal 2013 to reduce costs and improve efficiencies. As a result, the Company recorded a restructuring charge of $0.6 million, of which $0.2 million is included in “Product cost of revenue” and $0.4 million is included in “Operating expenses-restructuring and related charges” in the Consolidated Statements of Operations. The restructuring charge consisted of severance and benefits of $0.5 million related to the involuntary termination of thirty employees. In addition, the Company wrote-down, to its estimated net realizable value, leasehold improvements related to the Milpitas warehouse by $0.1 million.

Interest Income, Net

Interest income, net in the three months ended March 29, 2013 was relatively flat, as compared to the corresponding period in 2012. The increase in interest income resulting from the higher balance of cash, cash equivalents and short-term investments during the current period was offset by a decrease in the rate of return on such investments, as compared to the corresponding period in 2012.

Other Income (Expense), Net

Other income and expense, net is primarily comprised of foreign exchange gains and losses on cash, accounts receivable and intercompany balances denominated in currencies other than the U.S dollar. In the three months ended March 29, 2013, the other expense, net was $0.2 million, compared to $0.4 million of other income, net in the corresponding period of 2012. The increase in other expense, net was primarily due to higher foreign exchange losses resulting from the strengthening of the USD against the euro, Japanese yen and British pound during the first quarter of 2013. In addition, the first quarter of 2012 included a $0.2 million reimbursement of certain legal and tax claims associated with the acquisition of Omneon for which the Omneon shareholders had provided indemnification.

Income Taxes

Harmonic’s provision for income taxes, and provision for income taxes as a percentage of net revenue, in the three months ended March 29, 2013, are presented in the table below. Also presented are the related dollar and percentage changes in provision for income taxes in the three months ended March 29, 2013, from the corresponding period in 2012.

	Three months ended
	March 29, 2013			March 30, 2012
	(In thousands, except percentages)
Benefit from income taxes	$	(5,467	)	$	(626	)
As a percentage of net revenue		(5	)%		—	%
Increase	$	(4,841	)
Percent change		773	%

The increase in the benefit from income taxes in the three months ended March 29, 2013, compared to the same period in 2012, was primarily attributable to the reinstatement of the federal R&D tax credit retroactively from January 1, 2012, and an increase in loss from continuing operations in the three months ended March 29, 2013, compared to the same period in 2012.

Liquidity and Capital Resources

As of March 29, 2013, our cash and cash equivalents totaled $118.5 million, and our short-term investments totaled $109.8 million. As of March 29, 2013, a substantial majority of the Company’s cash, cash equivalents and short-term investments were held in accounts in the United States. The Company believes that these funds are sufficient to meet the requirements of our U.S. operations for the next twelve months, as well as any stock repurchases under the Company’s tender offer for up to $100.0 million of its common stock that commenced on April 26, 2013 or under its stock repurchase program (which is presently suspended until the termination of the tender offer).

In the event we need or desire to access funds from the short-term investments that we hold, it is possible that we may not be able to do so due to adverse market conditions. Our inability to sell all or a material portion of our short-term investments at par or our cost, or rating downgrades of issuers of these securities, could adversely affect our results of operations or financial condition. Nevertheless, we believe that our existing liquidity sources will satisfy our presently contemplated cash requirements for at least the next twelve months. However, if our expectations are incorrect, we may need to raise additional funds to fund our operations, to take advantage of unanticipated opportunities or to strengthen our financial position.

We have a bank line of credit facility with Silicon Valley Bank, which provides for borrowings of up to $10.0 million and matures on August 23, 2013. As of March 29, 2013, there were no amounts outstanding under the line of credit facility and there were no borrowings during the three months ended March 29, 2013. Future borrowings pursuant to the line would bear interest at the bank’s prime rate (3.25% at March 29, 2013) or at LIBOR for the desired borrowing period (an annualized rate of 0.20% for a one month borrowing period at March 29, 2013) plus 1.75%, or 1.95%. Borrowings are not collateralized. This facility contains a financial

26

covenant that requires us to maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00. As of March 29, 2013, the Company’s ratio under that covenant was 4.97 to 1. In the event of noncompliance by us with the covenants under the facility, including the financial covenant referenced above, Silicon Valley Bank would be entitled to exercise its remedies under the facility, including declaring all obligations immediately due and payable.

From time to time, we consider potential acquisitions that would complement our existing product offerings, enhance our technical capabilities or expand our marketing and sales presence. Any future transaction of this nature could require potentially significant amounts of capital or could require us to issue our stock and dilute existing stockholders. If adequate funds are not available, or are not available on acceptable terms, we may not be able to take advantage of market opportunities, to develop new products or to otherwise respond to competitive pressures.

In addition, our ability to raise funds may be adversely affected by a number of factors relating to Harmonic, as well as factors beyond our control, including any global or regional economic slowdown, market uncertainty surrounding the necessary increases in the U.S. debt limit and its future debt obligations, the impact of increases in oil prices and conditions in financial markets and the industries we serve. There can be no assurance that any financing will be available on terms acceptable to us, if at all.

The table below sets forth selected cash flow data for the periods presented (in thousands):

	Three months ended
	March 29, 2013			March 30, 2012
Net cash provided by (used in):
Operating activities	$	(5,743	)	$	7,891
Investing activities		34,403			(20,536	)
Financing activities		(6,760	)		2,552
Effect of foreign exchange rate changes on cash		(106	)		129
Net increase (decrease) in cash and cash equivalents	$	21,794		$	(9,964	)

Operating Activities

Net cash used in operations in the three months ended March 29, 2013 was $5.7 million, resulting from a net income of $6.4 million, adjusted for $2.1 million in non-cash charges, and a $14.2 million decrease in cash associated with the net change in operating assets and liabilities. The non-cash charges included amortization of intangible assets, stock-based compensation, depreciation, deferred income taxes, provisions for excess and obsolete inventories and doubtful accounts and a $15.0 million gain on disposal of discontinued operations, net of tax. The net change in operating assets and liabilities included increases in accounts receivable and prepaid expenses and other expenses, as well as decreases in accounts payable, income tax payable and accrued and other liabilities, which were offset by decreases in inventories, as well as increases in deferred revenue. The increase in accounts receivable was primarily due to shipments occurring later in the first quarter of 2013 than we experienced in the same period in 2012. The increase in prepaid expenses and other assets was primarily due to the increase in benefit from income taxes for the three months ended March 29, 2013, compared to the same period in 2012, due to the reinstatement of the federal R&D tax credit retroactively from January 1, 2012, and an increase in loss from continuing operations in the three months ended March 29, 2013, compared to the same period in 2012. The decrease in accounts payable was primarily due to the timing of payments and lower inventory purchases, and the decrease in inventory was primarily due to lower purchases resulting from sale of the cable access HFC business.

Net cash provided by operations in the three months ended March 30, 2012 was $7.9 million, resulting from a net loss of $7.5 million, adjusted for $15.3 million in non-cash charges, and a $0.1 million increase in cash associated with the net change in operating assets and liabilities. The non-cash charges included amortization of intangible assets, stock-based compensation, depreciation, deferred income taxes, and provisions for excess and obsolete inventories and doubtful accounts. The net change in operating assets and liabilities included decreases in inventories and prepaid expenses, as well as increases in accounts payable and deferred revenue, which were offset by an increase in accounts receivable, as well as decreases in accrued liabilities and income tax payable. The decrease in inventory was primarily due to better inventory management through reduced inventory purchases and increased consumption of on-hand inventory.

We expect that cash provided by operating activities may fluctuate in future periods as a result of a number of factors, including fluctuations in our operating results, shipment linearity, accounts receivable collections performance, inventory and supply chain management, tax benefits from stock-based compensation, and the timing and amount of compensation and other payments. In addition, we usually pay our annual incentive compensation to employees in the first quarter. Further, effective April 1, 2013, the Company replaced its existing employee paid time off benefit plan with a new program which no longer requires accrual of such benefits for its U.S. exempt employees. The accrued paid time off benefit balance for U.S. exempt employees as of March 29, 2013 was $4.5 million, and it was paid in full to such employees on April 12, 2013.

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Investing Activities

Net cash provided by investing activities was $34.4 million in the three months ended March 29, 2013, resulting from net proceeds from the sale of discontinued operations of $44.3 million and proceeds from the net sale and maturity of investments of $20.3 million, partially offset by the purchase of short-term investments of $25.9 million and capital expenditures of $4.3 million. The Company anticipates that the remaining selling costs of the discontinued operations of $0.8 million will be paid out by the end of its second quarter of fiscal 2013.

Net cash used in investing activities was $20.5 million in the three months ended March 30, 2012, resulting from the purchase of short-term investments of $36.7 million and capital expenditures of $3.7 million, partially offset by proceeds from the net sale and maturity of investments of $19.9 million.

Financing Activities

Net cash used in financing activities was $6.8 million in the three months ended March 29, 2013, resulting from $9.3 million of payments for the repurchase of common stock in connection with our stock repurchase program, offset by $2.5 million of net proceeds from the issuance of common stock related to our equity incentive plans.

Net cash provided by financing activities was $2.6 million in the three months ended March 30, 2012, resulting from the net proceeds from the issuance of common stock related to our equity incentive plans.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements as of March 29, 2013.

Contractual Obligations and Commitments

As of March 29, 2013, we had approximately $19.7 million of non-cancelable purchase order commitments. This amount does not include $5.5 million of non-cancelable purchase commitments with contract manufacturers and other suppliers on Aurora’s behalf. In the event Aurora were to default on its obligations to reimburse the Company for inventory purchased on its behalf, the Company would continue to be obligated to the vendors from which it purchased the inventory and, accordingly, its operating results, financial condition and cash flow could be materially and adversely affected. There were no other significant changes to our contractual obligations and commitments in the three months ended March 29, 2013, from the information presented in our 2012 Form 10-K, other than as a result of the sale of the cable access HFC business to Aurora.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk represents the risk of loss that may impact the operating results, financial position or liquidity of Harmonic due to adverse changes in market prices and rates. Harmonic is exposed to market risk because of changes in interest rates, foreign currency exchange rates, as measured against the U.S. dollar and currencies held by Harmonic’s subsidiaries, and changes in the value of financial instruments held by Harmonic.

Foreign Currency Exchange Risk

Harmonic has a number of international subsidiaries, each of whose sales are generally denominated in U.S. dollars. In addition, Harmonic has various international branch offices that provide sales support and systems integration services. Sales denominated in foreign currencies were approximately 15% and 10% of net revenue in the first three months of 2013 and 2012, respectively. Harmonic enters into foreign currency forward exchange contracts (“forward exchange contracts”) to manage exposure related to foreign accounts receivable and reduce the effects of fluctuating exchange rates on expenses denominated in foreign currencies. Harmonic does not enter into derivative financial instruments for trading purposes. The table below presents the impact on the foreign exchange gain (loss) of a hypothetical 10% appreciation and a 10% depreciation of the USD against the forward exchange contracts as of March 29, 2013 (in thousands):

Currency - forward contracts	Position	USD Value of Net Foreign Exchange Contracts		Foreign Exchange Gain (Loss) From 10% Appreciation of USD			Foreign Exchange Gain (Loss) From 10% Depreciation of USD
EUR	Sell EUR	$	9,141	$	914		$	(914	)
GBP	Sell GBP		4,156		416			(416	)
JPY	Sell JPY		3,932		393			(393	)
GBP	Buy GBP		1,050		(105	)		105
ILS	Buy ILS		3,932		(393	)		393

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Interest rate and credit risk

Exposure to market risk for changes in interest rates relates primarily to Harmonic’s investment portfolio of marketable debt securities of various issuers, types and maturities and to Harmonic’s borrowings, if any, under its bank line of credit facility. Harmonic does not use derivative instruments in its investment portfolio, and its investment portfolio only includes highly liquid instruments. These investments are classified as available for sale and are carried at estimated fair value, with material unrealized gains and losses reported in “accumulated other comprehensive income (loss)”. As of March 29, 2013, gross unrealized gains were nominal. If the credit market deteriorates, we may incur realized losses, which could adversely affect our financial condition and results of operations. There is risk that losses could be incurred if Harmonic were to sell any of its securities prior to stated maturity. As of March 29, 2013, our cash, cash equivalents and short-term investments balance was $228.3 million. In a declining interest rate environment, as short term investments mature, reinvestment occurs at less favorable market rates. Given the short term nature of certain investments, declining interest rates would negatively impact investment income. Based on our estimates, a 10% change in interest rates would have increased or decreased the fair value of our investments by less than $0.1 million as of March 29, 2013.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures

We maintain “disclosure controls and procedures,” as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are designed to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. In designing and evaluating our disclosure controls and procedures, management recognized that disclosure controls and procedures, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the disclosure controls and procedures are met. Additionally, in designing disclosure controls and procedures, our management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible disclosure controls and procedures. The design of any disclosure controls and procedures also is based, in part, upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.

Based on their evaluation as of the end of the period covered by this Quarterly Report on Form 10-Q, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective at a reasonable assurance level.

During the quarterly period covered by this report, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

29

PART II

OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages.

On November 14, 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent.

Harmonic is subject to other litigation incidental to its business that is not believed to be material to the Company.

ITEM 1A. RISK FACTORS

We depend on cable, satellite and telco, and broadcast and media industry capital spending for our revenue and any material decrease or delay in capital spending in any of these industries would negatively impact our operating results, financial condition and cash flows.

Our revenue has been derived from sales to cable television operators, satellite and telco operators and broadcast and media companies, as well as, more recently, emerging streaming media providers. We expect that these markets will provide our revenue for the foreseeable future. Demand for our products will depend on the magnitude and timing of capital spending by customers in each of these markets for the purpose of creating, expanding or upgrading their systems.

These capital spending patterns are dependent on a variety of factors, including:

• impact of general economic conditions, actual and projected;

• access to financing;

• annual capital spending budget cycles of each of the industries we serve;

• impact of industry consolidation;

• customers suspending or reducing capital spending in anticipation of the introduction of announced new products; such as HEVC and CCAP;

• federal, state, local and foreign government regulation of telecommunications, television broadcasting and streaming media;

• overall demand for communication services and consumer acceptance of new video and data services;

• competitive pressures, including pricing pressures; and

• discretionary end-user customer spending patterns;

In the past, specific factors contributing to reduced capital spending have included:

• weak or uncertain economic and financial conditions in domestic or one or more international markets;

• uncertainty related to development of digital video industry standards;

• delays in evaluations of new services, new standards and systems architectures by many operators;

• emphasis by operators on generating revenue from existing customers, rather than from new customers, through construction, expansion or upgrades;

• a reduction in the amount of capital available to finance projects of our customers and potential customers;

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• proposed and completed business combinations and divestitures by our customers and the length of regulatory review of each;

• completion of a new system or significant expansion or upgrade to a system; and

• bankruptcies and financial restructuring of major customers.

In the past, adverse economic conditions in one or more of the geographies in which we offer our products have adversely affected our customers’ capital spending in those geographies and, as a result, our business. In 2008, 2009 and the first half of 2010, economic conditions in many of the geographies in which we offer our products were very weak, and global economic conditions and financial markets experienced a severe downturn. The downturn stemmed from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Although there was an increase in global economic activity in the second half of 2010 and the first half of 2011, economic growth appears to have become sluggish in some geographies since the middle of 2011, and weak in other geographies, particularly in Europe, since the beginning of 2012. Further, economic growth is expected to be sluggish in some geographies during 2013.

The severity or length of time that economic and financial market conditions may be weak or sluggish, whether certain or all of such adverse factors will persist, or whether a severe down turn may occur in the U.S., Europe or in other geographies, is unknown. During challenging or uncertain economic times, and particularly in tight credit markets, many customers may delay or reduce capital expenditures, which often results in lower demand for our products.

Further, we have a number of international customers to whom sales are denominated in U.S. dollars. The value of the U.S. dollar fluctuates significantly against many foreign currencies, including the Euro and other local currencies of many of our international customers. If the U.S. dollar appreciates relative to the local currencies of our customers, then the prices of our products correspondingly increase for such customers. Such an effect could adversely impact sales of our products to such customers and result in longer sales cycles, difficulties in collection of accounts receivable, slower adoption of new technologies and increased price competition in the affected countries. Also, if the U.S. dollar were to weaken against many foreign currencies, there can be no assurance that a weaker dollar would lead to growth in capital spending.

In addition, industry consolidation has in the past constrained, and may in the future constrain, capital spending by our customers. Further, if our product portfolio and product development plans do not position us well to capture an increased portion of the capital spending of customers in the markets on which we focus, our revenue may decline.

As a result of these capital spending issues, we may not be able to maintain or increase our revenue in the future, and our operating results, financial condition and cash flows could be materially and adversely affected.

The markets in which we operate are intensely competitive.

The markets for our products are extremely competitive and have been characterized by rapid technological change and declining average sales prices in the past. Pressure on average sales prices was particularly severe during previous economic downturns, including in 2008 and 2009, as equipment suppliers competed aggressively for customers’ reduced capital spending, and we have experienced similar pressure during the economic slowdown that began in the second half of 2011 and has continued through the first quarter of 2013.

In the digital video solutions market, we compete broadly with products from vertically integrated system suppliers, including Motorola, Cisco Systems, Ericsson, and Thomson Video Networks and, in certain product lines, with a number of smaller companies. Our principal competitors for our production and playout products are Harris (now The Gores Group), Grass Valley, Miranda and Avid. Our principal competitors for edge products are Cisco Systems and Arris.

Many of our competitors are substantially larger, and have greater financial, technical, marketing and other resources than we have. Many of these large enterprises are in a better position to withstand any significant reduction in capital spending by customers in our markets. They often have broader product lines and market focus, and may not be as susceptible to downturns in a particular market. These competitors may also be able to bundle their products together to meet the needs of a particular customer, and may be capable of delivering more complete solutions than we are able to provide. To the extent large enterprises that currently do not compete directly with us choose to enter our markets by acquisition or otherwise, competition would likely intensify.

Further, some of our competitors that have greater financial resources have offered, and in the future may offer, their products at lower prices than we offer for our competing products or on more attractive financing or payment terms, which has in the past caused, and may in the future cause, us to lose sales opportunities and the resulting revenue or to reduce our prices in response to that competition. Reductions in prices for any of our products could materially and adversely affect our operating margins and revenue.

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If any of our competitors’ products or technologies were to become the industry standard, our business would be seriously harmed. If our competitors are successful in bringing their products to market earlier than us, or if these products are more technologically capable than ours, our revenue could be materially and adversely affected. In addition, certain companies that have not had a large presence in the broadband communications equipment market have expanded their presence in this market through mergers and acquisitions. The continued consolidation of our competitors, including, without limitation, the Arris acquisition of Motorola Home from Google’s Motorola Mobility unit, could have a significant negative impact on our business. Further, our competitors, particularly companies that offer products that are competitive with our digital video systems, may bundle their products or incorporate functionality into existing products in a manner that discourages users from purchasing our products or which may require us to lower our selling prices, resulting in lower revenue and decreased gross margins.

If we are unable to compete at the same level as we have in the past, in any of our markets, or are forced to reduce the prices of our products in order to continue to be competitive, our operating results, financial condition and cash flows would be materially and adversely affected.

We need to develop and introduce new and enhanced products in a timely manner to meet the needs of our customers and to remain competitive.

All of the markets we address are characterized by continuing technological advancement, changes in customer requirements and evolving industry standards. To compete successfully, we must continually design, develop, manufacture and sell new or enhanced products that provide increasingly higher levels of performance and reliability and meet our customers changing needs. However, we may not be successful in those efforts if, among other things, our products:

• are not cost effective;

• are not brought to market in a timely manner;

• are not in accordance with evolving industry standards;

• fail to meet market acceptance or customer requirements; or

• are ahead of the needs of their markets.

We are currently developing and marketing products based on established video compression standards, such as MPEG-4 AVC/H.264, which provides significantly greater compression efficiency, thereby making more bandwidth available to operators. We are also involved in research and development efforts with respect to products utilizing new technologies, such as high efficiency video coding, or “HEVC”. At the same time, we need to devote development resources to the existing MPEG-2 standard that many of our customers continue to require. There can be no assurance that these efforts will be successful in the near future, or at all, or that our competitors will not take significant market share in encoding or transcoding.

In order to attempt to meet fast paced, dynamic, evolving standards and customer requirements, we are intensifying our development efforts on products that will facilitate and enhance multi-screen applications, on media (“playout”) servers utilizing integrated channel playout, and on converged cable access platform (“CCAP”) products that are intended to address customers’ cost reduction efforts through the use of IP technology. Many of these products are intended to integrate existing and new features and functions in response to shifts in customer demands in the relevant market. The success of these significant and costly development efforts will be predicated, in substantial part, on the timing of market adoption of the new standards on which the resulting products are based. If any of the new standards are not adopted or such adoption is earlier or later than we are predicting, we risk spending research and development time and dollars on products that may never achieve market acceptance or introducing products that miss the customer demand window and thus do not produce the revenue that a timely introduction would have likely produced.

In order to successfully develop and market certain of our planned products, we may be required to enter into technology development or licensing agreements with third parties. We cannot provide assurances that we will be able to timely enter into any necessary technology development or licensing agreements on reasonable terms, or at all.

If we fail to develop and market new and enhanced products on a timely basis, our operating results, financial condition and cash flows could be materially and adversely affected.

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Conditions and changes in some national and global economic environments may adversely affect our business and financial results.

Adverse economic conditions in geographic markets in which we operate may harm our business. As described in the first risk factor in this section, economic conditions in some countries in which we sell products were weak in 2008, 2009, the first half of 2010, the second half of 2011, and 2012 and continued to be weak in the first quarter of 2013. That weakness was principally the result of global financial markets having experienced a severe downturn, stemming from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Global or regional economic slowdowns have led many of our affected customers to decrease their expenditures and caused certain of our customers to reduce or delay orders for our products. Many of our international customers have been exposed to tight credit markets and depreciating currencies, further restricting their ability to build, expand or upgrade their networks. Some customers have had difficulty in servicing or retiring existing debt, and the financial constraints on certain international customers have, in the past, required us to significantly increase our allowance for doubtful accounts. It is possible that adverse economic conditions may return during 2013, on a regional or global basis, and it appears that weak economic conditions that reoccurred in most countries in Europe in the second half of 2011 and in 2012, principally as a result of the European sovereign debt crisis, may not rebound to early 2011 levels in 2013.

Beginning in the second quarter of 2011, the possible inability of some developed countries, including Greece, Italy, Ireland, Portugal, Spain and Cyprus, or major financial institutions in those countries, to meet their debt payment obligations has put substantial strain, both direct and indirect, on economic conditions in those countries, in Europe and in many other parts of the world, including the U.S. If one or more of the Euro-zone countries were to default on its sovereign debt, or several of their major financial institutions were to fail, the adverse impact on European and other economies, including the U.S., could be severe. Further, the lowering of the U.S. government’s credit rating in 2011 had an adverse affect on U.S. and international financial markets. Any further lowering of that credit rating, whether as a result of the U.S. government failing to timely increase its debt limit or to take steps to reduce its deficit, or the impact of the U.S. government forced reductions in spending due to sequestration, may have a material and adverse affect on the U.S. economy, and possibly the economies of most, if not all, of the other countries in the world. The impact of any of these issues, which appears to have negatively affected Europe, beginning in the second half of 2011 and through 2012, and may continue to negatively affect Europe during the balance of 2013, could have a material adverse effect on our business, operating results, financial condition and cash flows.

During challenging economic times, and in tight credit markets, many customers may delay or reduce capital expenditures. This could result in reductions in revenue of our products, longer sales cycles, difficulties in collection of accounts receivable, slower adoption of new technologies and increased price competition. If global economic and market conditions, or economic conditions in the U.S., Europe or other key markets, deteriorate, we could experience a material and adverse effect on our business, results of operations, financial condition and cash flows.

Our customer base is concentrated and we are regularly involved in relatively large transactions. The loss of one or more of our key customers, a failure to diversify our customer base, or a decrease in the number of such larger transactions could harm our business.

Historically, a majority of our revenue has been derived from relatively few customers, due in part to the consolidation of the ownership of cable television and direct broadcast satellite system companies. Over the last two fiscal years, revenue from our ten largest customers has remained relatively flat as a percentage of revenue. Nevertheless, sales to our ten largest customers in the first quarter of 2013 and the fiscal year ended December 31, 2012 accounted for approximately 35% and 31% of revenue, respectively. Although we are attempting to broaden our customer base by further penetrating new markets and expanding internationally, we expect to see continuing industry consolidation and customer concentration.

In the first quarter of 2013 and in the fiscal year ended December 31, 2012, revenue from Comcast accounted for approximately 9% and 11%, respectively, of our revenue. The loss of Comcast or any other significant customer, any material reduction in orders by Comcast or any significant customer, or our failure to qualify our new products with a significant customer could materially and adversely affect, either long term or in a particular quarter, our operating results, financial condition and cash flows. In addition, we are involved in most quarters in one or more relatively large individual transactions, including, from time to time, projects in which we act much like a systems integrator. A decrease in the number of the relatively larger individual transactions in which we are involved in any quarter could adversely affect our operating results for that quarter.

As a result of these and other factors, we may be unable to increase our revenues from some or all of the markets we address, or to do so profitably, and any failure to increase revenues and profits from these customers could materially and adversely affect our operating results, financial condition and cash flows.

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We depend significantly on our international revenue and are subject to the risks associated with international operations, which may negatively affect our operating results.

Revenue derived from customers outside of the U.S. in the first quarter of 2013 and the fiscal year ended December 31, 2012 represented approximately 58% and 56% of our revenue, respectively. The percentage of our revenue attributable to international operations in the first quarter, compared to the same percentage in 2012, primarily resulted from a decrease in our revenues attributable to U.S. sales in the first quarter. However, although no assurances can be given with respect to international sales growth in any one or more regions, we expect that international revenue is likely to continue to represent, from year to year, a majority, and potentially increasing, percentage of our annual revenue for the foreseeable future. Furthermore, most of our contract manufacturing occurs overseas.

Our international operations, the international operations of our contract manufacturers, and our efforts to maintain and increase revenue in international markets are subject to a number of risks, which are generally greater with respect to emerging market countries, including the impact on our business and operating results, whether direct or indirect, of:

• growth and stability of the economy in one or more international regions;

• fluctuations in currency exchange rates;

• changes in foreign government regulations and telecommunications standards;

• import and export license requirements, tariffs, taxes and other trade barriers;

• a significant reliance on distributors, resellers and others to sell our products and solutions, particularly in emerging market countries;

• availability of credit, particularly in emerging market countries;

• difficulty in collecting accounts receivable, especially from smaller customers and resellers, particularly in emerging market countries;

• compliance with the U.S. Foreign Corrupt Practices Act, or FCPA, and the U.K. Bribery Act, particularly in emerging market countries;

• the burden of complying with a wide variety of foreign laws, treaties and technical standards;

• fulfilling “country of origin” requirements for our products for certain customers;

• difficulty in staffing and managing foreign operations;

• political and economic instability, including risks related to terrorist activity, particularly in emerging market countries;

• changes in economic policies by foreign governments;

• lack of basic infrastructure, particularly in emerging market countries;

• impact of continuing social and political unrest in the Middle East and resulting regime changes; and

• impact of recent “saber rattling” by the North Korean government and the risk of war resulting from such threats and actions.

In the past, certain of our international customers accumulated significant levels of debt and engaged in reorganizations and financial restructurings, including bankruptcy proceedings. Even where these restructurings have been completed, in some cases these customers have not been in a position to purchase new equipment at levels we had seen in the past.

While our international revenue and operating expenses have typically been denominated in U.S. dollars, fluctuations in currency exchange rates could cause our products to become relatively more expensive to customers in a particular country, leading to a reduction in revenue or profitability from sales in that country. A portion of our European business is denominated in Euros, which subjects us to increased foreign currency risk. Gains and losses on the conversion to U.S. dollars of accounts receivable, accounts payable and other monetary assets and liabilities arising from international operations may contribute to fluctuations in our operating results.

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Furthermore, payment cycles for international customers are typically longer than those for customers in the U.S. Unpredictable payment cycles could cause us to fail to meet or exceed the expectations of security analysts and investors for any given period.

Our operations outside the U.S. also require us to comply with a number of U.S. and international regulations. For example, our operations in countries outside the U.S. are subject to the FCPA and similar laws, including the U.K. Bribery Act, which prohibits companies or their agents and employees from providing anything of value to a foreign official for the purposes of influencing any act or decision of these individuals, in their official capacity, to help obtain or retain business, direct business to any person or corporate entity, or obtain any unfair advantage. Our activities in countries outside the U.S., and particularly in emerging market countries, create the inherent risk of unauthorized payments or offers of payments by one of our employees or agents, including those companies to which we outsource certain of our business operations, which could be in violation of the FCPA or similar laws, even though these parties are not always subject to our control. We have internal control policies and procedures with respect to FCPA compliance, have implemented FCPA training and compliance programs for our employees, and include in our agreements with distributors and resellers a requirement that those parties comply with the FCPA. However, we cannot provide assurances that our policies, procedures and programs will prevent violations of the FCPA or similar laws by our employees or agents, particularly in emerging market countries, and as we expand our international operations. Any such violation, even if prohibited by our policies, could result in criminal or civil sanctions against us.

The effect of one or more of these international risks could have a material and adverse effect on our business, financial condition, operating results and cash flows.

Our future growth depends on market acceptance of several broadband services, on the adoption of new broadband technologies, and on several other broadband industry trends.

Future demand for many of our products will depend significantly on the growing market acceptance of emerging broadband services, including digital video, VOD, HDTV, IPTV, mobile video services (particularly streaming to tablet computers and other mobile devices), and very high-speed data services. The market demand for such emerging services is rapidly growing, with many de facto or proprietary systems in use, which increases the challenge of delivering interoperable products intended to address the requirements of such services.

The effective delivery of these services will depend, in part, on a variety of new network architectures, standards and devices, such as:

• video compression standards, such as high efficiency video coding (“HEVC”);

• The converged cable access platform (“CCAP”);

• fiber to the premises, or FTTP, networks designed to facilitate the delivery of video services by telcos;

• the greater use of protocols such as IP;

• the further adoption of bandwidth-optimization techniques, such as switched digital video and DOCSIS 3.0; and

• the introduction of new consumer devices, such as advanced set-top boxes, personal video recorders (or PVRs), iPads and other tablet computers, and a variety of smartphone mobile devices.

If adoption of these emerging services and/or technologies is not as widespread or as rapid as we expect, or if we are unable to develop new products based on these technologies on a timely basis, our operating results, financial condition and cash flows could be materially and adversely affected.

Furthermore, other technological, industry and regulatory trends and requirements will affect the growth of our business. These trends and requirements include the following:

• convergence, or the need of network operators to deliver a package of video, voice and data services to consumers, including mobile delivery options;

• the increasing availability of traditional broadcast video content on the Internet;

• adoption of high bandwidth wireless technology, such as 4 G-LTE;

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• the use of digital video by businesses, governments and educational institutions;

• efforts by regulators and governments in the U.S. and abroad to encourage the adoption of broadband and digital technologies;

• consumer interest in Ultra HDTV;

• the need to develop partnerships with other companies involved in the new broadband services;

• the extent and nature of regulatory attitudes towards such issues as network neutrality, competition between operators, access by third parties to networks of other operators, local franchising requirements for telcos to offer video, and other new services, such as mobile video; and

• the outcome of litigation and negotiations between content owners and service providers regarding rights of service providers to store and distribute recorded broadcast content, which outcomes may drive adoption of one technology over another in some cases.

If we fail to recognize and respond to these trends, by timely developing products, features and services required by these trends, we are likely to lose revenue opportunities and our operating results, financial condition and cash flows could be materially and adversely affected.

We purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources, and we are increasingly dependent on contract manufacturers and other subcontractors.

Many components, subassemblies and modules necessary for the manufacture or integration of our products are obtained from a sole supplier or a limited group of suppliers. For example, we depend on a small public company for certain video encoding chips which are incorporated into several products. Our reliance on sole or limited suppliers, particularly foreign suppliers, and our increasing reliance on contractors for manufacturing and installation, involves several risks, including a potential inability to obtain an adequate supply of required components, subassemblies or modules, reduced control over costs, quality and timely delivery of components, subassemblies or modules, and timely installation of products. In particular, certain optical components have in the past been in short supply and are available only from a small number of suppliers, including sole source suppliers.

These risks could be heightened during a substantial economic slowdown, because our suppliers and subcontractors are more likely to experience adverse changes in their financial condition and operations during such a period. Further, these risks could materially and adversely affect our business if one of our sole sources, or a sole source of one of our suppliers or contract manufacturers, is adversely affected by a natural disaster. While we expend resources to qualify additional component sources, consolidation of suppliers and the small number of viable alternatives have limited the results of these efforts. Managing our supplier and contractor relationships is particularly difficult during time periods in which we introduce new products and during time periods in which demand for our products is increasing, especially if demand increases more quickly than we expect.

Plexus Services Corp., which manufactures our products at its facilities in Malaysia, acts as our primary contract manufacturer, and currently provides us with a substantial majority of the products that we purchase from our contract manufacturers. Most of the products manufactured by our Israeli operations are outsourced to a single third party manufacturer located in Israel. From time to time we assess our relationship with our contract manufacturers, and we do not generally maintain long-term agreements with any of our suppliers or contract manufacturers. Our agreement with Plexus has automatic annual renewals, unless prior notice is given by either party, and has been automatically renewed until October 2013.

Difficulties in managing relationships with any of our current contract manufacturers, particularly Plexus, that manufacture our products off-shore, could impede our ability to meet our customers’ requirements and adversely affect our operating results. An inability to obtain adequate and timely deliveries, or any other circumstance that would require us to seek alternative sources of supply, could negatively affect our ability to ship our products on a timely basis, which could damage relationships with current and prospective customers and harm our business and materially and adversely affect our revenue and other operating results. We attempt to limit this risk by maintaining safety stocks of certain components, subassemblies and modules. Increases, from time to time, in demand on our suppliers and subcontractors from other parties have caused sporadic shortages of certain components and products. In response, we have increased our inventories of certain components and products and expedited shipments of our products when necessary, which has increased our costs. As a result of this investment in inventories, we have in the past been, and in the future may be, subject to risk of excessive or obsolete inventories, which, despite our use of a demand order fulfillment model, could materially and adversely affect our business, operating results, financial position and cash flows. In this regard, our gross margins and operating results have, in the past, been adversely affected by significant excess and obsolete inventory charges.

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Our ability to meet customer demand depends significantly on the availability of components and other materials, as well as the ability of our contract manufacturers to scale their production, and because we purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources, the risk of not meeting customer demand is increased. Our ability to meet customer requirements depends in part on our ability to obtain sufficient volumes of these materials in a timely fashion. Increases in demand on our suppliers and subcontractors from other customers may cause sporadic shortages of certain components and products. In order to be able to respond to these issues, we have increased our inventories of certain components and products, particularly for our customers that order significant dollar amounts of our products, and expedited shipments of components, subassemblies and modules when necessary, which has increased our costs and could increase our risk of holding obsolete or excessive inventory. We also employ a demand order fulfillment model which is designed to reduce the effects of increases or decreases in demand for any products. Nevertheless, we may be unable to respond to customer demand that increases more quickly than we expect. If we fail to meet customers’ supply expectations, our revenue would be adversely affected and we may lose business, which could materially and adversely affect our operating results, financial condition and cash flows.

Our operating results are likely to fluctuate significantly and, as a result, may fail to meet or exceed the expectations of securities analysts or investors, causing our stock price to decline.

Our operating results have fluctuated in the past and are likely to continue to fluctuate in the future, on an annual and a quarterly basis, as a result of several factors, many of which are outside of our control. Some of the factors that may cause these fluctuations include:

• the level and timing of capital spending of our customers, in the U.S., Europe and in other foreign markets, due in part to access to financing, including credit, for capital spending;

• economic and financial conditions specific to each of the cable, satellite and telco, and broadcast and media industries;

• changes in market demand for our products or our customers’ services or products;

• the timing and amount of orders, especially from our significant customers;

• general economic and financial markets conditions, whether global or in certain geographic areas;

• the mix of our products sold and the effect it has on gross margins;

• the timing of revenue recognition from solution contracts, which may span several quarters;

• changes in the number and size of relatively large individual transactions and projects in which we are involved from quarter to quarter;

• the timing of revenue recognition on sales arrangements;

• the timing of acquisitions and dispositions by us and the financial impact of such transactions;

• the timing of completion of our customers’ projects;

• the length of each customer product upgrade cycle and the volume of purchases during the cycle;

• competitive market conditions, including pricing actions by our competitors;

• lack of predictability in our revenue cycles;

• the level and mix of our international revenue;

• new product introductions by our competitors or by us;

• changes in domestic and international regulatory environments affecting our business;

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• market acceptance of our products, particularly our new products;

• the evaluation of new services, new standards and system architectures by our customers;

• the cost and timely availability to us of components, subassemblies and modules;

• the mix of our customer base, by industry and size, and sales channels;

• changes in our operating and extraordinary expenses;

• impairment of our goodwill and intangibles;

• the impact of litigation, such as related litigation expenses and settlement costs;

• write-downs of inventory and investments;

• whether the research and development tax is renewed for 2014 and beyond;

• changes in our effective federal tax rate, including as a result of changes in our valuation allowance against our deferred tax assets, and changes in our effective state tax rates, including as a result of apportionment;

• changes in our mix of domestic versus international revenue;

• changes to tax rules related to the deferral of foreign earnings and compliance with foreign tax rules;

• the impact of applicable accounting guidance on accounting for uncertainty in income taxes that requires us to establish reserves for uncertain tax positions and accrue potential tax penalties and interest;

• the impact of applicable accounting guidance on business combinations that requires us to record charges for certain acquisition related costs and expenses and generally to expense restructuring costs associated with a business combination subsequent to the acquisition date; and

• the timing of our development of custom products and software.

The timing of deployment of our products by our customers can be subject to a number of other risks, including the availability of skilled engineering and technical personnel, the availability of third party equipment and services, our customers’ ability to negotiate and enter into rights agreements with video content owners that provide the customers with the right to deliver certain video content, and our customers’ need for local franchise and licensing approvals.

We often recognize a substantial portion of our quarterly revenue in the last month of the quarter. We establish our expenditure levels for product development and other operating expenses based on projected revenue levels for a specified period, and expenses are relatively fixed in the short term. Accordingly, even small variations in the timing of revenue, particularly from relatively large individual transactions, can cause significant fluctuations in operating results in a particular quarter.

As a result of these factors and other factors, our operating results in one or more future periods may fail to meet or exceed the expectations of securities analysts or investors. In that event, the trading price of our common stock would likely decline.

Fluctuations in our future effective tax rates, or the outcome of tax audits, could affect our future operating results, financial condition and cash flows.

We are required to periodically review our deferred tax assets and determine whether, based on available evidence, a valuation allowance is necessary. Accordingly, we have performed such evaluation, from time to time, based on historical evidence, trends in profitability, expectations of future taxable income and implemented tax planning strategies. We continue to maintain a valuation allowance for certain foreign and California deferred tax assets. In the event, in the future, we determine an additional valuation allowance is necessary with respect to our U.S. state or foreign deferred tax assets, we would incur a charge equal to the amount of the valuation allowance, as a discrete item, in the period in which we made such determination and this could have a material and adverse effect on our operating results for such period.

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The calculation of tax liabilities involves dealing with uncertainties in the application of complex global tax regulations. We recognize potential liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on our estimate of whether, and the extent to which, additional taxes will be due. In the event we determine that it is appropriate to create a reserve or increase an existing reserve for any such potential liabilities, the amount of the additional reserve is charged as an expense in the period in which it is determined. If 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 we determine the liabilities are no longer necessary. If the estimate of tax liabilities proves to be less than the ultimate tax assessment for the applicable period, a further charge to expense in the period such short fall is determined would result. Either such charge to expense could have a material and adverse effect on our results of operations for the applicable period.

In addition, recent statements from the Internal Revenue Service have indicated their intent to seek greater disclosure by companies of their reserves for uncertain tax positions.

Our 2008, 2009 and 2010 U.S. corporate income tax returns are presently being audited by the Internal Revenue Service. These audits commenced in the second quarter of 2011. A subsidiary of the Company is under an audit, which commenced in the first quarter of 2012, by the Israel tax authority for the years 2007 through 2010. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the U.S. or Israel is for an amount in excess of the tax provision we have recorded in the applicable period, our overall tax expense, effective tax rate, operating results and cash flow could be materially and adversely impacted in the period of adjustment.

We requested an Advanced Pricing Agreement with the Internal Revenue Service regarding our non-exclusive license of our intellectual property rights to one of our international subsidiaries in 2008 and our sharing of research and development costs with our international subsidiaries. We completed the same non-exclusive license of Omneon intellectual property in the fourth quarter of 2010, upon the closing of the Omneon acquisition. In 2012, we withdrew our request for the Advanced Pricing Agreement with the Internal Revenue Service with respect to our initial non-exclusive license of intellectual property. As noted above, our U.S. corporate tax returns for both 2008 and 2010 are presently being audited by the Internal Revenue Service. If the Internal Revenue Service, in connection with such audit or otherwise, were to disagree with our tax treatment of either of such non-exclusive licenses, we may be required to take a charge to expense related to such disagreement, which could have a material and adverse effect on our operating results in the period in which the charge is taken.

We continue to be in the process of expanding our international operations and staffing to better support our expansion into international markets. This expansion involves the implementation of an international structure that includes, among other things, an international support center in Europe, a research and development cost sharing arrangement, and certain licenses and other contractual arrangements between us and our wholly-owned domestic and foreign subsidiaries. As a result of these changes, we anticipate that our consolidated pre-tax income will be subject to foreign tax at relatively lower tax rates when compared to the U.S. federal statutory tax rate and, as a consequence, our effective income tax rate is expected to be lower than the U.S. federal statutory rate.

Our future effective income tax rates could be adversely affected if tax authorities challenge our international tax structure or if the relative mix of U.S. and international income changes for any reason. Accordingly, there can be no assurance that our income tax rate will be less than the U.S. federal statutory rate in future periods.

We or our customers may face intellectual property infringement claims from third parties.

Our industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. In particular, leading companies in the telecommunications industry have extensive patent portfolios. Also, patent infringement claims and litigation by entities that purchase or control patents, but do not produce goods or services covered by the claims of such patents (so-called “non-practicing entities” or “NPEs”), have increased rapidly over the last decade or so. From time to time, third parties, including NPEs, have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights against us or our customers. Our suppliers and their customers, including us, may have similar claims asserted against them. A number of third parties, including companies with greater financial and other resources than us, have asserted patent rights to technologies that are important to us.

Any intellectual property litigation, regardless of its outcome, could result in substantial expense and significant diversion of the efforts of our management and technical personnel. An adverse determination in any such proceeding could subject us to significant liabilities and temporary or permanent injunctions and require us to seek licenses from third parties or pay royalties that may be substantial. Furthermore, necessary licenses may not be available on terms satisfactory to us, or at all. An unfavorable outcome on any such litigation matter could require that we pay substantial damages, could require that we pay ongoing royalty payments, or could prohibit us from selling certain of our products. Any such outcome could have a material and adverse effect on our business, operating results, financial condition and cash flows.

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In October 2011, Avid Technology, Inc. filed a complaint in the United States District Court for the District of Delaware, alleging that our Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint, alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages. At this time, we cannot predict the outcome of either of these matters. An unfavorable outcome of either of these matters, or any other intellectual property infringement action, could materially and adversely affect our business, operating results, financial position and cash flows.

Our suppliers and customers may have intellectual property claims relating to our products asserted against them. We have agreed to indemnify some of our suppliers and most of our customers for patent infringement relating to our products. The scope of this indemnity varies, but, in some instances, includes indemnification for damages and expenses (including reasonable attorney’s fees) incurred by the supplier or customer in connection with such claims. If a supplier or a customer seeks to enforce a claim for indemnification against us, we could incur significant costs defending such claim, the underlying claim or both. An adverse determination in either such proceeding could subject us to significant liabilities and have a material and adverse effect on our operating results, cash flows and financial condition.

We may be the subject of litigation which, if adversely determined, could harm our business and operating results.

In addition to the litigation discussed elsewhere herein, we may be subject to claims arising in the normal course of business. The costs of defending any litigation, whether in cash expenses or in management time, could harm our business and materially and adversely affect our operating results and cash flows. An unfavorable outcome on any litigation matter could require that we pay substantial damages, or, in connection with any intellectual property infringement claims, could require that we pay ongoing royalty payments or prohibit us from selling certain of our products. In addition, we may decide to settle any litigation, which could cause us to incur significant settlement costs. A settlement or an unfavorable outcome on any litigation matter could have a material and adverse affect on our business, operating results, financial condition and cash flows.

As an example, we have received letters from several of our customers, notifying us that the customer intends to exercise its indemnification rights in agreements between the customer and us with respect to a patent infringement claim brought against the customer that may cover products sold to the customer by Harmonic or its acquired companies. Many of these notices arise out of a spate of patent infringement claims, and related litigation, brought by the Multimedia Patent Trust (“MPT”), an affiliate of Alcatel-Lucent, against end-users of products used in the industries we address. Any such litigation by MPT may be very expensive to defend, and there could be significant financial exposure to each of such customers if MPT is successful in such litigation or in extracting a settlement of such claims. Few of the notices we have received from a customer with respect to its indemnification rights related to the MPT litigation have demanded that we provide a defense for the customer against such claims or litigation or currently reimburse the customer for its costs of such defense. We cannot predict whether the claims by MPT are legitimate or actually cover any of our products, whether the claims are likely to result in a settlement or judgment against a customer defendant (although some such settlements have occurred), or whether we would have liability under our indemnification obligations for defense or settlement costs or damages paid by any customer defendant. In the event one or more of our other customers makes a written indemnification claim against us with respect to a specific amount of defense or settlement costs or damages it suffers as a result of such MPT claims or litigation, we may be obligated to pay amounts to such customer(s) that, either individually or in the aggregate, could materially and adversely affect our operating results, financial condition and cash flows.

We rely on distributors, value-added resellers and systems integrators for a significant portion of our revenue, and disruptions to, or our failure to develop and manage our relationships with these customers and the processes and procedures that support them could adversely affect our business.

We generate a significant percentage of our revenue through sales to distributors, value-added resellers, or VARs, and systems integrators that assist us with fulfillment or installation obligations. We expect that these sales will continue to generate a significant percentage of our revenue in the future. Further, our reliance on VARs and systems integrators that specialize in video delivery solutions, products and services has increased since the completion of our acquisition of Omneon in 2010. Accordingly, our future success is highly dependent upon establishing and maintaining successful relationships with a variety of channel partners.

We generally have no long-term contracts or minimum purchase commitments with any of our distributor, VAR or system integrator customers, and our contracts with these parties do not prohibit them from purchasing or offering products or services that compete with ours. Our competitors may provide incentives to any of our distributor, VAR or systems integrator customers to favor their products or, in effect, to prevent or reduce sales of our products. Any of our distributor, VAR or systems integrator customers may independently choose not to purchase or offer our products. Many of our distributors, VARs and system integrators are small, are based in a variety of international locations, and may have relatively unsophisticated processes and limited financial resources to conduct their business. Any significant disruption of our sales to these customers, including as a result of the inability or unwillingness of these customers to continue purchasing our products, or their failure to properly manage their business with respect to the purchase of and payment for our products, could materially and adversely affect our business, operating results, financial condition and cash flows. In addition, our failure to continue to establish or maintain successful relationships with distributor, VAR and systems integrator customers could likewise materially and adversely affect our business, operating results, financial condition and cash flows.

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Changes in telecommunications legislation and regulations could harm our prospects and future revenue.

Changes in telecommunications legislation and regulations in the U.S. and other countries could affect the revenue from our products. In particular, regulations dealing with access by competitors to the networks of incumbent operators could slow or stop additional construction or expansion by these operators. Increased regulation of our customers’ pricing or service offerings could limit their investments and, consequently, revenue from our products. The impact of new or revised legislation or regulations could have a material adverse effect on our business, operating results, financial condition and cash flows.

Recently adopted Federal laws will likely impact the demand for product features by our customers. These laws include the Commercial Advertisement Loudness Mitigation Act and the Twenty-First Century Communications and Video Accessibility Act of 2010, which deals with accessibility for the hearing and visually impaired. While we have added some features to our products in anticipation of these laws, others (driven by the regulatory process related to the laws) may require feature development on a schedule which may be inflexible and difficult to meet. This could result in our inability to develop other product features necessary for particular transactions at the same time, and thus we could lose some business and the related revenue.

The ongoing threat of terrorism, social and political instability and tensions among countries have created uncertainty and may harm our business.

Conditions in the U.S. and global economies improved from mid-2010 to mid-2011, but have remained uncertain since mid-2011. The terrorist attacks in the U.S. in 2001, subsequent and continuing attempted and accomplished terrorist attacks in other parts of the world, and the threat of future attacks have created many economic and political uncertainties that have adversely impacted the global economy and, as a result, have adversely affected our business. The long-term effects of such attacks, the threat of future attacks, the ongoing war on terrorism, recent increased social and political instability and regime changes, particularly in the Middle East, and tensions among countries, including between Iran and Israel and the U.S., and North Korea and South Korea and the U.S., on our business and the global economy remain uncertain. Such uncertainty has increased the price of certain commodities, particularly oil, which could have an indirect material and adverse impact on the cost of manufacturing and shipping our products. Moreover, the potential for future terrorist attacks, including hacking attacks on government and commercial computer systems, and regional wars, increases in such social and political instability, and such tensions, particularly if Israel or any other country were to attack any of Iran’s nuclear development facilities or North Korea were to attack South Korea or any other country, make it difficult to estimate the long-term stability and strength of the U.S. and other economies, particularly those in certain emerging market countries and certain European countries, and the impact of resulting economic conditions on our business.

We face risks associated with having important facilities and resources located in Israel.

We maintain facilities in two locations in Israel with a total of 219 employees, or approximately 20% of our worldwide workforce, as of March 29, 2013. Our employees in Israel engage in a number of activities, including research and development, the development of, and supply chain management for, one product line, and sales activities.

We are directly influenced by the political, economic and military conditions affecting Israel. Any significant conflict involving Israel could have a direct effect on our business or that of our Israeli contract manufacturers, in the form of physical damage or injury, reluctance to travel within, or to or from, Israel by our Israeli and other employees or those of our subcontractors, or the loss of Israeli employees to active military duty. Most of our employees in Israel are currently obligated to perform annual reserve duty in the Israel Defense Forces, and approximately 15% of those employees were called for active military duty in 2012. In the event that more employees are called to active duty, certain of our research and development activities may be adversely affected, including significantly delayed. In addition, the interruption or curtailment of trade between Israel and its trading partners, as a result of terrorist attacks or hostilities, conflicts between Israel and any other Middle Eastern country, or any other cause, could significantly harm our business. Current or future tensions in the Middle East could materially and adversely affect our business, operating results, financial condition and cash flows.

We have made, and expect to continue to make, acquisitions, and any acquisition could disrupt our operations, cause dilution to our stockholders and materially and adversely affect our business, operating results, cash flows and financial condition.

As part of our business strategy, from time to time we have acquired, and we continue to consider acquiring, businesses, technologies, assets and product lines that we believe complement or expand our existing business. In 2010, we completed the acquisition of Omneon, a privately-held company that provides broadcast video server and storage systems used for video production and play-to-air workflows. It is possible that we will make additional acquisitions, from time to time, in the future.

We may face challenges as a result of these acquisition activities, because such activities entail numerous risks, including:

• the possibility that an acquisition may not close because of, among other things, a failure of a party to satisfy the conditions to closing or an acquisition target entering into an alternative transaction;

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• unanticipated costs or delays associated with the acquisition;

• difficulties in the assimilation and integration of acquired operations, technologies and/or products;

• the diversion of management’s attention from the regular operations of the business during the acquisition process;

• the challenges of managing a larger and more geographically widespread operation and product portfolio after the closing of the acquisition;

• difficulties in integrating acquired companies’ systems, controls, policies and procedures, particularly to comply with the internal control over financial reporting requirements of the Sarbanes-Oxley Act of 2002;

• adverse effects on new and existing business relationships with suppliers, contract manufacturers and customers;

• channel conflicts and disputes between distributors and other partners of ours and the acquired companies;

• potential difficulties in completing projects associated with in-process research and development;

• risks associated with entering markets in which we may have no or limited prior experience;

• the potential loss of key employees of acquired businesses;

• difficulties in the assimilation of different corporate cultures and practices;

• difficulties in bringing acquired products and businesses into compliance with applicable legal requirements in jurisdictions in which we operate and sell products;

• substantial charges for acquisition costs, which are required to be expensed under accounting guidance on business combinations;

• substantial charges for the amortization of certain purchased intangible assets, deferred stock compensation or similar items;

• substantial impairments to goodwill or intangible assets in the event that an acquisition proves to be less valuable than the price we paid for it;

• delays in realizing, or failure to realize, the anticipated benefits of an acquisition or disposal; and

• the possibility that any acquisition or disposal may be viewed negatively by our customers or investors or the financial markets.

Competition within our industry for acquisitions of businesses, technologies, assets and product lines has been, and is likely to continue to be, intense. As such, even if we are able to identify an acquisition that we would like to consummate, we may not be able to complete the acquisition on commercially reasonable terms or because the target chooses to be acquired by another company. Furthermore, in the event that we are able to identify and consummate any future acquisitions, we may, in each of those acquisitions:

• issue equity securities which would dilute current stockholders’ percentage ownership;

• incur substantial debt to finance the acquisition or assume substantial debt in the acquisition;

• incur significant acquisition-related expenses;

• assume substantial liabilities, contingent or otherwise; or

• expend significant cash.

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These financing activities or expenditures could materially and adversely affect our operating results, cash flows and financial condition or the price of our common stock, or both. Alternatively, due to difficulties in the capital or credit markets at the time, we may be unable to secure capital on reasonable terms, or at all, necessary to complete an acquisition.

Moreover, even if we were to obtain benefits from acquisitions in the form of increased revenue and earnings per share, there may be a delay between the time the expenses associated with an acquisition are incurred and the time we recognize such benefits.

As of March 29, 2013, we have approximately $198 million of goodwill recorded on our balance sheet associated with prior acquisitions. In the event we determine that our goodwill is impaired, we would be required to write down all or a portion of such goodwill, which could result in a material non-cash charge to our results of operations in the period in which such write-down occurs.

If we are unable to successfully address one or more of these risks, our business, operating results, financial condition and cash flows could be materially and adversely affected.

We may sell one or more of our product lines, from time to time, as a result of our evaluation of our products and markets, and any such divestiture could adversely affect our expenses, revenues, results of operation, cash flows and financial position.

We periodically evaluate our various product lines and may, as a result, consider the divestiture of one or more of those product lines. Any such divestiture could adversely affect our expenses, revenues, results of operations, cash flows and financial position.

On February 18, 2013, we entered into an Asset Purchase Agreement with Aurora Networks pursuant to which we agreed to sell our cable access HFC business (the “Business”) for $46 million in cash. This disposition of the Business closed on March 5, 2013. Revenue from this Business in 2012 was approximately $53 million, which represented approximately 10% of our revenue for the year.

Divestitures of product lines have inherent risks, including the expense of selling the product line, the possibility that any anticipated sale will not occur, possible delays in closing any sale, the risk of lower-than-expected proceeds from the sale of the divested business, unexpected costs associated with the separation of the business to be sold from the seller’s information technology and other operating systems, and potential post-closing claims for indemnification or breach of transition services obligations of the seller . Expected cost savings, which are offset by revenue losses from divested businesses, may also be difficult to achieve or maximize due to the seller’s fixed cost structure, and a seller may experience varying success in reducing fixed costs or transferring liabilities previously associated with the divested business.

As part of the transition services the Company provides to Aurora in connection with the sale of the Business, the Company, at Aurora’s request during the five month period after the close of the sale, purchases access inventory from the Company’s vendors on behalf of Aurora. As of March 29, 2013, the Company had $1.4 million of payables to vendors, and purchase commitments of $5.5 million, on Aurora’s behalf. In the event Aurora were to default on its obligations to reimburse the Company for inventory purchased on its behalf, the Company would continue to be obligated to the vendors from which it purchased the inventory and, accordingly, its operating results, financial condition and cash flow could be materially and adversely affected.

The sale of the Business will reduce future annual potential revenue, likely in the range of $50 million to $55 million, future annual expenses, including cost of sales, likely in the range of $45 million to $50 million, and cash flow. With this reduction in revenue and cash flow, the sale could also have an adverse affect on our results of operations and financial position.

Broadband communications markets are characterized by rapid technological change.

Broadband communications markets are subject to rapid changes, making it difficult to accurately predict the markets’ future growth rates, sizes or technological directions. In view of the evolving nature of these markets, it is possible that pay TV service providers, broadcasters, content providers and other video production and delivery companies will decide to adopt alternative architectures, new business models, and/or technologies that are incompatible with our current or future products. In addition, successful new entrants into the media markets, both domestic and international, may impact existing industry business models, resulting in decreased spending by our existing customer base. Finally, decisions by customers to adopt new technologies or products are often delayed by extensive evaluation and qualification processes, which can result in delays in revenue from current and new products. If we are unable to design, develop, manufacture and sell products that incorporate, or are compatible with, these new architectures or technologies, our business, operating results, financial condition and cash flows would be materially and adversely affected.

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Our operating results could be adversely affected by natural disasters affecting the Company or impacting our third-party manufacturers, suppliers, distributors or customers.

Our headquarters and the majority of our operations are located in California, which is prone to earthquakes. In the event that any of our business centers are adversely affected by an earthquake or by any other natural disaster, we may sustain damage to our operations and properties, which could cause a sustained interruption or loss of affected operations, and cause us to suffer significant financial losses.

We rely on third-party manufacturers for the production of most of our products. Any significant disruption in the business or operations of such manufacturers or of our suppliers could adversely impact our business. Our principal third-party manufacturer and several of our suppliers and distributors have operations in locations that are subject to natural disasters, such as severe weather, tsunamis, floods and earthquakes, which could disrupt their operations and, in turn, our operations.

In addition, if there is a major earthquake or other natural disaster in any of the locations in which our significant customers are located, we face the risk that our customers may incur losses or sustained business interruption, or both, which may materially impair their ability to continue their purchase of products from us. Accordingly, a major earthquake or other natural disaster in one of the geographies in which we, or our third-party manufacturers, suppliers or customers, operate could have a material and adverse effect on our business, operating results, cash flows and financial condition.

In order to manage our growth, we must be successful in addressing management succession issues and attracting and retaining qualified personnel.

Our future success will depend, to a significant extent, on the ability of our management to operate effectively, both individually and as a group. We must successfully manage transition and replacement issues that may result from the departure or retirement of members of our executive management, whether in the context of an acquisition or otherwise. We cannot provide assurances that changes of management personnel in the future would not cause disruption to operations or customer relationships or a decline in our operating results.

We are also dependent on our ability to retain and motivate our existing highly qualified personnel, in addition to attracting new highly qualified personnel. Competition for qualified management, technical and other personnel is often intense, and we may not be successful in attracting and retaining such personnel. Competitors and others have in the past attempted, and are likely in the future to attempt, to recruit our employees. While our employees are required to sign standard agreements concerning confidentiality and ownership of inventions, we generally do not have employment contracts or non-competition agreements with any of our personnel. The loss of the services of any of our key personnel, the inability to attract or retain highly qualified personnel in the future or delays in hiring such personnel, particularly senior management and engineers and other technical personnel, could negatively affect our business and operating results.

We could be negatively affected as a result of a possible proxy contest and the actions of activist stockholders.

We recently received a notice from Voce Capital Partners LP and certain of its affiliates that announces their intent to nominate three individuals for election to our Board of Directors. If a proxy contest results from this notice or proposal, or if other activist activities continue, our business could be adversely affected because:

• responding to a proxy contest and other actions by activist stockholders can be costly and time-consuming, disrupting our operations and diverting the attention of management and our employees;

• perceived uncertainties as to our future direction caused by activist activities may result in the loss of potential business opportunities, and may make it more difficult to attract and retain qualified personnel and business partners; and

• if individuals are elected to our Board of Directors with a specific agenda, it may adversely affect our ability to effectively and timely implement our strategic plans.

We may not be able to effectively manage our operations.

In recent years, the Company has grown significantly, principally through acquisitions, and expanded our international operations. Upon the closing of our acquisition of Scopus in 2009, we added 221 employees, most of whom are based in Israel. Upon the closing of the acquisition of Omneon in 2010, we added 286 employees, most of whom are based in the U.S.

As of March 29, 2013, we have 487 employees in our international operations, representing approximately 44% of our worldwide workforce. Our ability to manage our business effectively in the future, including with respect to any future growth, the integration of recent and any future acquisitions, and the breadth of our international operations, will require us to train, motivate and manage our employees successfully, to attract and integrate new employees into our overall operations, to retain key employees and to continue to improve our operational, financial and management systems. There can be no assurances that we will be successful in any of those regards, and our failure to effectively manage our operations could have a material and adverse effect on our business, operating results, cash flows and financial condition.

Our failure to adequately protect our proprietary rights and data may adversely affect us.

At March 29, 2013, we held 49 issued U.S. patents and 14 issued foreign patents (reduced from prior periods as a result of the disposition of our cable access HFC business), and have a number of patent applications pending. Although we attempt to protect our intellectual property rights through patents, trademarks, copyrights, licensing arrangements, maintaining certain technology as trade secrets and other measures, we can give no assurances that any patent, trademark, copyright or other intellectual property rights owned by us will not be invalidated, circumvented or challenged, that such intellectual property rights will provide competitive advantages to us, or that any of our pending or future patent applications will be issued with the scope of the claims sought by us, if at all. We can give no assurances that others will not develop technologies that are similar or superior to our technologies, duplicate our technologies or design around the patents that we own. In addition, effective patent, copyright and trade secret protection may be unavailable or limited in certain foreign countries in which we do business or may do business in the future.

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We believe that patents and patent applications are not currently significant to our business, and we do not rely on our patent portfolio to give us a competitive advantage over others in our industry. We believe that the future success of our business will depend on our ability to translate the technological expertise and innovation of our personnel into new and enhanced products. We generally enter into confidentiality or license agreements with our employees, consultants, and vendors and our customers, as needed, and generally limit access to, and distribution of, our proprietary information. Nevertheless, we cannot provide assurances that the steps taken by us will prevent misappropriation of our technology. In addition, we have taken in the past, and may take in the future, legal action to enforce our patents and other intellectual property rights, to protect our trade secrets, to determine the validity and scope of the proprietary rights of others, or to defend against claims of infringement or invalidity. Such litigation could result in substantial costs and diversion of management time and other resources, and could materially and adversely affect our business, operating results, financial condition and cash flows.

Recently reported hacking attacks on government and commercial computer systems, particularly attacks sponsored by foreign governments or enterprises, raise the risks that such an attack may compromise, in a material respect, one or more of our computer systems and permit hackers access to our proprietary information and data. If such an attack does, in fact, allow access to or theft of our proprietary information or data, our business, operating results, financial condition and cash flows could be materially and adversely affected.

Our products include third-party technology and intellectual property, and our inability to acquire new technologies or use third-party technology in the future could harm our business.

In order to successfully develop and market certain of our planned products, we may be required to enter into technology development or licensing agreements with third parties. Although companies with technology useful to us are often willing to enter into technology development or licensing agreements with respect to such technology, we cannot provide assurances that such agreements may be negotiated on commercially reasonable terms, or at all. The failure to enter into such technology development or licensing agreements, when necessary or desirable, could limit our ability to develop and market new products and could materially and adversely affect our business.

We incorporate certain third-party technologies, including software programs, into our products, and, as noted, intend to utilize additional third-party technologies in the future. In addition, the technologies that we license may not operate properly or as specified, and we may not be able to secure alternatives in a timely manner, either of which could harm our business. We could face delays in product releases until alternative technology can be identified, licensed or developed, and integrated into our products, if we are able to do so at all. These delays, or a failure to secure or develop adequate technology, could materially and adversely affect our business, operating results, financial condition and cash flows.

We cannot assure you that our tender offer or any stock repurchase program will actually result in repurchases of our common stock or enhance long-term stockholder value, and repurchases, if any, could affect our stock price and increase its volatility and will diminish our cash reserves.

On April 18, 2013, our Board of Directors approved a modified “Dutch Auction” tender offer to repurchase up to $100 million of shares of our common stock. The tender offer is scheduled to expire on May 24, 2013, unless extended. Until the tender offer expires, we will not know the amount of shares that have been tendered for repurchase, or the exact per share price (within the $5.75 to $6.25 range offered) that we will be required to pay to stockholders who tender shares. We cannot provide any assurance that we will repurchase a sufficient number of shares of our common stock through the tender offer to accomplish our stated objectives. Accordingly, we may pursue other strategies to return capital to stockholders, including open market repurchases.

Following the termination of our tender offer, we expect to resume our previously announced stock repurchase program, the size of which will be determined based upon the results of the tender offer. Under the program, we are authorized to repurchase shares of our common stock in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing and actual number of shares repurchased, if any, will depend on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The program was suspended prior to the announcement of the tender offer, and may be suspended or discontinued at any time in the future without prior notice.

Repurchases pursuant to our tender offer and our stock repurchase program could affect our stock price and increase its volatility. The successful completion of our tender offer, and continued repurchases under our stock repurchase program, will reduce the market liquidity for our stock. Additionally, repurchases under our tender offer and any renewed stock repurchase program will diminish our cash reserves, which could impact our ability to pursue possible future strategic opportunities and acquisitions and would result in lower overall returns on our cash balances. There can be no assurance that any stock repurchases will, in fact, occur, or, if they occur, that they will enhance stockholder value because the market price of our common stock may decline below the levels at which we repurchased shares of stock. Although our tender offer and our stock repurchase program are intended to enhance long-term stockholder value, short-term stock price fluctuations could reduce the effectiveness of these repurchases.

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We are subject to import and export controls that could subject us to liability or impair our ability to compete in international markets.

Our products are subject to U.S. export controls, and may be exported outside the U.S. only with the required level of export license or through an export license exception, in most cases because we incorporate encryption technology into our products. In addition, various countries regulate the import of certain technology and have enacted laws that could limit our ability to distribute our products, or could limit our customers’ ability to implement our products, in those countries. Changes in our products or changes in export and import regulations may create delays in the introduction of our products in international markets, prevent our customers with international operations from deploying our products throughout their global systems or, in some cases, prevent the export or import of our products to certain countries altogether. Any change in export or import regulations or related legislation, shift in approach to the enforcement or scope of existing regulations, or change in the countries, persons or technologies targeted by such regulations, could result in decreased use of our products by, or in our decreased ability to export or sell our products to, existing or potential international customers.

In addition, we may be subject to customs duties that could have a significant adverse impact on our operating results or, if we are able to pass on the related costs in any particular situation, would increase the cost of the related product to our customers. As a result, the future imposition of significant increases in the level of customs duties or the creation of import quotas on our products in Europe or in other jurisdictions, or any of the limitations on international sales described above, could have a material adverse effect on our business, operating results, financial condition and cash flows. Further, some of our customers in Europe have been, or are being, audited by local governmental authorities regarding the tariff classifications used for importation of our products. Import duties and tariffs vary by country and a different tariff classification for any of our products may result in higher duties or tariffs, which could have an adverse impact on our operating results and potentially increase the cost of the related products to our customers.

We may need additional capital in the future and may not be able to secure adequate funds on terms acceptable to us.

We have been engaged in the design, manufacture and sale of a variety of video products and system solutions since inception, which has required, and will continue to require, significant research and development expenditures.

We believe that our existing cash and short-term investments of approximately $228 million, at March 29, 2013, even as reduced through future repurchases of our common stock under the tender offer and stock repurchase program discussed on page 45, will satisfy our cash requirements for at least the next twelve months. However, we may need to raise additional funds if our expectations are incorrect, to take advantage of presently unanticipated strategic opportunities, to satisfy our other cash requirements from time to time, or to strengthen our financial position. Our ability to raise funds may be adversely affected by a number of factors, including factors beyond our control, such as weakness in the economic conditions in markets in which we sell our products and continued uncertainty in financial, capital and credit markets. There can be no assurance that equity or debt financing will be available to us on reasonable terms, if at all, when and if it is needed.

In addition, we regularly review potential acquisitions that would complement our existing product offerings, enhance our technical capabilities, or expand our marketing and sales presence. Any future transaction of this nature could require potentially significant amounts of capital to finance the acquisition and related expenses, as well as to integrate operations following the acquisition, and could require us to issue our stock and dilute existing stockholders.

We may raise additional financing through public or private equity offerings, debt financings, or corporate partnership or licensing arrangements. To the extent we raise additional capital by issuing equity securities or convertible debt, our stockholders may experience dilution. To the extent that we raise additional funds through collaboration and licensing arrangements, it may be necessary to relinquish some rights to our technologies or products, or grant licenses on terms that are not favorable to us. To the extent we raise capital through debt financing arrangements, we may be required to pledge assets or enter into covenants that could restrict our operations or our ability to incur further indebtedness and the interest on such debt may adversely affect our operating results.

If adequate capital is not available, or is not available on reasonable terms, when needed, we may not be able to take advantage of acquisition or other market opportunities, to timely develop new products, or to otherwise respond to competitive pressures.

Negative conditions in the global credit and financial markets may impair the liquidity or the value of a portion of our investment portfolio.

Negative conditions in the global credit and financial markets have had an adverse impact on the liquidity of certain of our investments in the past. In the event we need or desire to access funds from the short-term investments that we hold, it is possible that we may not be able to do so due to market conditions. If a buyer is found, but is unwilling to purchase the investments at par or our

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cost, we may incur a loss. Further, rating downgrades of the security issuer or the third parties insuring such investments may require us to adjust the carrying value of these investments through an impairment charge. Our inability to sell all or some of our short-term investments at par or our cost, or rating downgrades of issuers or insurers of these securities, could materially and adversely affect our operating results, financial condition and cash flows.

In addition, we invest our cash, cash equivalents and short-term investments in a variety of investment vehicles, in a number of countries, with, and in the custody of, financial institutions with high credit ratings. While our investment policy and strategy attempt to manage interest rate risk, limit credit risk, and ensure we only invest in what we view as very high-quality securities, the outlook for our investment holdings is dependent on general economic conditions, interest rate trends and volatility in the financial marketplace, both internationally and in the U.S., which can all affect, directly and indirectly, the income that we receive, the value of our investments and our ability to sell those investments.

We believe that our investment securities are carried at fair value. However, over time the economic and market environment in which we conduct business may provide us with additional insight regarding the fair value of certain securities in our portfolio that could change our judgment regarding impairment of those securities. This could result in unrealized or realized losses in our securities, relating to other than temporary declines, being charged against income. Given current market conditions, particularly in Europe, there is continuing risk that declines in fair value of our portfolio securities may occur and impairments may be charged to income in future periods.

If demand for our products increases more quickly than we expect, we may be unable to meet our customers’ requirements.

If demand for our products increases, the difficulty of accurately forecasting our customers’ requirements and meeting these requirements will increase. Forecasting to meet customers’ needs and effectively managing our supply chain is particularly difficult in connection with newer products. Our ability to meet customer demand depends significantly on the availability of components and other materials, as well as the ability of our contract manufacturers to scale their production. Furthermore, we purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources. Our ability to meet customer requirements depends in part on our ability to obtain sufficient volumes of these materials in a timely fashion. Increases in demand on our suppliers and subcontractors from other customers may cause sporadic shortages of certain components and products.

In order to be able to respond to these issues, we have increased our inventories of certain components and products, particularly for our customers that order significant dollar amounts of our products, and expedited shipments of our products when necessary, which has increased our costs and could increase our risk of holding obsolete or excessive inventory. We also employ a demand order fulfillment model which is designed to reduce the effects of increases or decreases in demand for any products. Nevertheless, we may be unable to respond to customer demand that increases more quickly than we expect. If we fail to meet customers’ supply expectations, our revenue would be adversely affected and we may lose business, both short and long term, which could materially and adversely affect our operating results, financial condition and cash flows.

We are subject to various laws and regulations related to the environment and potential climate change that could impose substantial costs upon us and may adversely affect our business, operating results, cash flows and financial condition.

Our operations are regulated under various federal, state, local and international laws relating to the environment and potential climate change, including those governing the management, disposal and labeling of hazardous substances and wastes and the cleanup of contaminated sites. We could incur costs and fines, third-party property damage or personal injury claims, or could be required to incur substantial investigation or remediation costs, if we were to violate or become liable under environmental laws. The ultimate costs to us under these laws and the timing of these costs are difficult to predict.

We also face increasing complexity in our product design as we adjust to new and future requirements relating to the presence of certain substances in electronic products and making producers of those products financially responsible for the collection, treatment, recycling, and disposal of certain products. For example, the European Parliament and the Council of the European Union have enacted the Waste Electrical and Electronic Equipment (WEEE) directive, which regulates the collection, recovery and recycling of waste from electrical and electronic products, and the Restriction on the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) directive, which bans the use of certain hazardous materials, including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) that exceed certain specified levels. Legislation similar to RoHS and WEEE has been or may be enacted in other jurisdictions, including in the U.S., Japan and China. Our failure to comply with these laws could result in our being directly or indirectly liable for costs, fines or penalties and third-party claims, and could jeopardize our ability to conduct business in such regions and countries.

We also expect that our operations will be affected by other new environmental laws and regulations on an ongoing basis. Although we cannot predict the ultimate impact of any such new laws and regulations, they will likely result in additional costs, and could require that we redesign or change how we manufacture our products, any of which could have a material and adverse effect on our operating results, financial condition and cash flows.

47

Some anti-takeover provisions contained in our certificate of incorporation and bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

We have provisions in our certificate of incorporation and bylaws that could have the effect of rendering more difficult or discouraging an acquisition deemed undesirable by our Board of Directors. These include provisions:

• authorizing blank check preferred stock, which could be issued with voting, liquidation, dividend and other rights superior to our common stock;

• limiting the liability of, and providing indemnification to, our directors and officers;

• limiting the ability of our stockholders to call, and bring business before, special meetings;

• requiring advance notice of stockholder proposals for business to be conducted at meetings of our stockholders and for nominations of candidates for election to our Board of Directors;

• controlling the procedures for conduct and scheduling of Board of Directors and stockholder meetings; and

• providing the Board of Directors with the express power to postpone previously scheduled annual meetings and to cancel previously scheduled special meetings.

These provisions, alone or together, could delay hostile takeovers, changes in control of the Company or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation law, which prevents some stockholders holding more than 15% of our outstanding common stock from engaging in certain business combinations without approval of the holders of substantially all of our outstanding common stock.

Any provision of our certificate of incorporation or bylaws or Delaware law that has the effect of delaying or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our common stock, and could also affect the price that some investors are willing to pay for our common stock.

Our common stock price may be extremely volatile, and the value of an investment in our stock may decline.

Our common stock price has been highly volatile. We expect that this volatility will continue in the future due to factors such as:

• general market and economic conditions;

• actual or anticipated variations in operating results;

• announcements of technological innovations, new products or new services by us or by our competitors or customers;

• changes in financial estimates or recommendations by stock market analysts regarding us or our competitors;

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

• announcements by our customers regarding end user market conditions and the status of existing and future infrastructure network deployments;

• our recent announcement and commencement of a tender offer to repurchase up to $100 million of shares of our common stock and the expiration of that tender offer;

• additions or departures of key personnel; and

• future equity or debt offerings or our announcements of these offerings.

In addition, in recent years, the stock market in general, and the NASDAQ Stock Market and the securities of technology companies in particular, have experienced extreme price and volume fluctuations. These fluctuations have often been unrelated or

48

disproportionate to the operating performance of individual companies. These broad market fluctuations have in the past, and may in the future, materially and adversely affect our stock price, regardless of our operating results. In these circumstances, investors may be unable to sell their shares of our common stock at or above their purchase price over the short term, or at all.

Our stock price may decline if additional shares are sold in the market or if analysts drop coverage of or downgrade our stock.

Future sales of substantial amounts of shares of our common stock by our existing stockholders in the public market, or the perception that these sales could occur, may cause the market price of our common stock to decline. In addition, we will be required to issue substantial amounts of additional shares upon exercise of stock options, including under our Employee Stock Purchase Agreement, or grants of restricted stock units. Increased sales of our common stock in the market after exercise of outstanding stock options or grants of restricted stock units could exert downward pressure on our stock price. These sales also might make it more difficult for us to sell equity or equity-related securities in the future at a time and price we deem appropriate.

The trading market for our common stock relies in part on the availability of research and reports that third-party industry or securities analysts publish about us. If one or more of the analysts who do cover us downgrade our stock, our stock price may decline. If one or more of these analysts cease coverage of us, we could lose visibility in the market, which in turn could cause the liquidity of our stock and our stock price to decline.

We are exposed to additional costs and risks associated with complying with increasing regulation of corporate governance and disclosure standards.

We have spent, and expect to continue to spend, a substantial amount of management time and costly external resources to comply with changes in laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002, SEC regulations, the NASDAQ Stock Market rules and applicable provisions of the Dodd-Frank Act of 2010. In particular, Section 404 of the Sarbanes-Oxley Act requires management’s annual review and evaluation of our internal control over financial reporting and attestation of the effectiveness of our internal control over financial reporting by our independent registered public accounting firm in connection with the filing of our Form 10-K for each fiscal year. We have documented and tested our internal control systems and procedures and have made improvements in order for us to comply with the requirements of Section 404. This process has required us to hire additional personnel and outside advisory services and has resulted in significant additional expenses.

While our management’s assessment of our internal control over financial reporting resulted in our conclusion that, as of December 31, 2012, our internal control over financial reporting was effective, and our independent registered public accounting firm has attested that our internal control over financial reporting was effective in all material respects as of December 31, 2012, we cannot predict the outcome of our testing and that of our independent registered public accounting firm in future periods. If we conclude in future periods that our internal control over financial reporting is not effective or if our independent registered public accounting firm is unable to provide an unqualified attestation as of future year-ends, we may incur substantial additional costs in an effort to correct such problems and investors may lose confidence in our financial statements, and the price of our stock will likely decrease in the short term, until we correct such problems, and perhaps in the long term, as well.

In addition, we are subject to new requirements under the Dodd-Frank Act of 2010 that will require us to diligence, disclose, and report whether or not our products contain conflict minerals. The implementation of these new requirements could adversely affect the sourcing, availability, and pricing of the materials used in the manufacture of semiconductor devices or other components used in our products. In addition, we will incur additional costs to comply with the disclosure requirements, including costs related to conducting diligence procedures to determine the sources of conflict minerals that may be used or necessary to the production of our products and, if applicable, potential changes to products, processes or sources of supply as a consequence of such verification activities. It is also possible that we may face reputational harm if we determine that certain of our products contain minerals not determined to be conflict free and/or we are unable to alter our products, processes or sources of supply to avoid such materials.

49

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

On April 24, 2012, the Board of Directors approved a stock repurchase program that provides for the repurchase of up to $25 million of the Company’s outstanding common stock during the term of the program, which expires 18 months from Board approval. On January 28, 2013, our Board of Directors approved a $75 million increase to our existing $25 million stock repurchase program. On February 19, 2013, the Board approved a further $35 million increase to the program upon the closing of a sale of the Company’s cable access HFC business. The Board has authorized aggregate repurchases under the program of $135 million, approximately $32 million of which had been utilized for repurchases as of March 29, 2013.

Under the program, we are authorized to repurchase shares of common stock in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing and actual number of shares repurchased, if any, will depend on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The program may be suspended or discontinued at any time without prior notice.

The table below sets forth the stock repurchase activity for the quarter ended March 29, 2013 (in thousands, except per share amounts):

Period	Total Number of Shares Repurchased as Part of the Program		Average Price Paid per Share		Approximate Dollar Value of Shares that May Yet be Purchased Under the Program
January 1, 2013 - January 25, 2013		—		—	$	2,361
January 26, 2013 - February 22, 2013		—		—	$	112,361
February 23, 2013 - March 29, 2013		1,608	$	5.76	$	103,093
		1,608	$	5.76

On April 22, 2013, the Company announced that it expected to commence a modified “Dutch Auction” tender offer to purchase up to $100.0 million of its common stock at a price per share not less than $5.75 and not greater than $6.25. The tender offer commenced on April 26, 2013, and will expire on May 24, 2013, unless extended. The minimum number of shares that may be purchased in the tender offer represents approximately 14.1% of Harmonic’s currently outstanding common stock. Until the expiration of the tender offer, the Company has suspended its previously announced stock repurchase program.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

50

ITEM 6. EXHIBITS

Exhibit Number	Exhibit Index
31.1	Section 302 Certification of Principal Executive Officer
31.2	Section 302 Certification of Principal Financial Officer
32.1	Section 906 Certification of Principal Executive Officer
32.2	Section 906 Certification of Principal Financial Officer
101***	The following materials from Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 29, 2013, formatted in Extensible Business Reporting Language (XBRL) includes:
	(i)Condensed Consolidated Balance Sheets at March 29, 2013 and December 31, 2012, (ii) Condensed Consolidated Statements of Operations for the three months ended March 29, 2013 and March 30, 2012, (iii) Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 29, 2013 and March 30, 2012, (iv) Condensed Consolidated Statements of Cash Flows for the three months ended March 29, 2013 and March 30, 2012, and (v) Notes to Condensed Consolidated Financial Statements.

51

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.

HARMONIC INC.
By:	/s/ Carolyn V. Aver
	Carolyn V. Aver
	Chief Financial Officer
	(Principal Financial and Accounting Officer)
	Date: May 8, 2013

52

EX-31.1

Exhibit 31.1

Harmonic Inc.

Certification of Principal Executive Officer

Pursuant to Section 302 of

The Sarbanes-Oxley Act of 2002

I, Patrick J. Harshman, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Harmonic Inc.;

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: May 8, 2013

By:	/s/ Patrick J. Harshman
	Patrick J. Harshman
	President and Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Harmonic Inc.

Certification of Principal Financial Officer

Pursuant to Section 302 of

The Sarbanes-Oxley Act of 2002

I, Carolyn V. Aver, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Harmonic Inc.;

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: May 8, 2013

By:	/s/ Carolyn V. Aver
	Carolyn V. Aver
	Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

Harmonic Inc.

Certification of Principal Executive Officer

Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

As of the date hereof, I, Patrick J. Harshman, President and Chief Executive Officer of Harmonic Inc. (the “Company”), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Company’s Quarterly Report on Form 10-Q for the quarter ended March 29, 2013, as filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This written statement is being furnished to the Securities and Exchange Commission as an exhibit accompanying such Report and shall not be deemed filed pursuant to the Securities Exchange Act of 1934, as amended.

Date: May 8, 2013

/s/ Patrick J. Harshman

Patrick J. Harshman

President and Chief Executive Officer

(Principal Executive Officer)

EX-32.2

Exhibit 32.2

Harmonic Inc.

Certification of Principal Financial Officer

Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

As of the date hereof, I, Carolyn V. Aver, Chief Financial Officer of Harmonic Inc. (the “Company”), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Company’s Quarterly Report on Form 10-Q for the quarter ended March 29, 2013, as filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This written statement is being furnished to the Securities and Exchange Commission as an exhibit accompanying such Report and shall not be deemed filed pursuant to the Securities Exchange Act of 1934, as amended.

Date: May 8, 2013

/s/ Carolyn V. Aver

Carolyn V. Aver

Chief Financial Officer

(Principal Financial Officer)

XML

Discontinued Operations - Recorded Gain With the Sale of Cable Access HFC Business (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 05, 2013	Mar. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill de-recognized		$ 14,547
Gain on disposal, net of tax		14,956
HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Proceeds	46,000	46,000
Inventories, net		10,487
Prepaid expenses and other current assets		612
Property and equipment, net		1,133
Goodwill de-recognized		14,547
Deferred revenue		(4,499)
Accrued liabilities		(939)
Total net assets sold and de-recognized		21,341
Less : selling cost		2,469
Less : Tax effect		7,234
Gain on disposal, net of tax		$ 14,956

XML

Employee Benefit Plans - Summary of Stock Options Outstanding (Detail) (Stock Options Outstanding [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Stock Options Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Vested and expected to vest	9,071
Weighted Average Exercise Price, Vested and expected to vest	$ 6.83
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest	3 years 4 months 24 days
Aggregate Intrinsic Value, Vested and expected to vest	$ 3,053
Number of Shares, Exercisable	6,518
Weighted Average Exercise Price, Exercisable	$ 7.17
Weighted Average Remaining Contractual Term (Years), Exercisable	2 years 4 months 24 days
Aggregate Intrinsic Value, Exercisable	$ 2,187

XML

Goodwill and Identified Intangible Assets - Amortization Expense for Identifiable Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Schedule Of Goodwill By Segment [Line Items]
Total amortization expense	$ 7,033	$ 7,539
Product cost of revenue [Member]
Schedule Of Goodwill By Segment [Line Items]
Total amortization expense	4,945	5,360
Operating Expenses [Member]
Schedule Of Goodwill By Segment [Line Items]
Total amortization expense	$ 2,088	$ 2,179

XML

Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic value of options exercised	$ 500,000
Discretionary contributions of plan	25.00%
Percentage of contribution by eligible participants	4.00%
Maximum contribution per participant	$ 1,000
Defined contribution plan description	This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Prior to 2009, Harmonic made discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Harmonic's contributions were suspended from 2009 through 2012, but have been renewed, on the same basis, for 2013.

XML

Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Business Combinations [Abstract]
Balance at beginning of period	$ 212,518
Reduction in goodwill associated with the sale of the cable access HFC Business	(14,547)
Foreign currency translation adjustment	(151)
Balance at end of period	$ 197,820

XML

Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 29, 2013

Earnings Per Share [Abstract]

Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Calculations

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts):

	Three months ended
	March 29, 2013			March 30, 2012
Numerator:
Loss from continuing operations	$	(9,503	)	$	(8,735	)
Income from discontinued operations		15,924			1,207
Net income (loss)	$	6,421		$	(7,528	)
Denominator:
Basic and diluted weighted average number of shares outstanding		115,219			117,275
Basic and diluted net income (loss) per share from:
Continuing operations	$	(0.08	)	$	(0.07	)
Discontinued operations		0.14			0.01
Net Income (loss)	$	0.06		$	(0.06	)

Anti-dilutive Securities

The following table sets forth the potentially dilutive shares from stock options, restricted stock units and the ESPP, for the periods presented, that were excluded from the net income (loss) per share computations because their effect was anti-dilutive (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Potentially dilutive equity awards outstanding		13,131		10,209

XML

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,986	$ 4,800
Total stock-based compensation in operating expense	3,288	3,914
Total stock-based compensation	3,899	4,667
Product cost of revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	611	753
Research and development expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,203	1,655
Selling, general and administrative expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 2,085	$ 2,259

XML

Discontinued Operations (Tables)

3 Months Ended

Mar. 29, 2013

Discontinued Operations And Disposal Groups [Abstract]

Schedule of Details on Income Statement Caption on TSA Billing

The table below provides details on the income statement caption under which the TSA billing was recorded (in thousands):

	Three months ended
	March 29, 2013
Product cost of revenue	$	175
Research and development		9
Selling, general and administrative		144
Total TSA billing to Aurora	$	328

Recorded Gain With the Sale of Cable Access HFC Business

The Company recorded a gain of $15.0 million in connection with the sale of the cable access HFC business, calculated as follows (in thousands):

Gross Proceeds				$	46,000
Less : carrying value of net assets
Inventories, net	$	10,487
Prepaid expenses and other current assets		612
Property and equipment, net		1,133
Goodwill de-recognized		14,547
Deferred revenue		(4,499	)
Accrued liabilities		(939	)
Total net assets sold and de-recognized				$	21,341
Less : selling cost				$	2,469
Less : Tax effect				$	7,234
Gain on disposal, net of tax				$	14,956

Revenues and Components of Net Income Related to Discontinued Operations

Revenue and the components of net income related to the discontinued operations for the three months ended March 29, 2013 and March 30, 2012 were as follows:

	Three months ended
	March 29, 2013			March 30, 2012
Revenue	$	9,556		$	11,282
Operating income	$	834		$	1,226
Less: (Benefit from) provision for income taxes		(134	)		19
Add: Gain on disposal, net of tax		14,956			—
Income from discontinued operations, net of taxes	$	15,924		$	1,207

XML

Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in continuing operations	565
Cash payments	(247)
Non-cash write-offs	(101)
Ending balance	217
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in continuing operations	464
Cash payments	(247)
Non-cash write-offs
Ending balance	217
Impairment of Leasehold improvements [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in continuing operations	101
Cash payments
Non-cash write-offs	(101)
Ending balance
Omneon Restructuring [Member] | Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	869
Cash payments	(455)
Accretion	20
Ending balance	434
HFC business [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in discontinued operations	367
Cash payments	(165)
Ending balance	202
HFC business [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in discontinued operations	243
Cash payments	(165)
Ending balance	78
HFC business [Member] | Contract termination [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance
Restructuring charges in discontinued operations	124
Cash payments
Ending balance	$ 124

XML

Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Less than one year	$ 84,402	$ 76,779
Due in 1-2 years	25,388	27,727
Total short-term investments, Estimated Fair Value	$ 109,790	$ 104,506

XML

Discontinued Operations - Additional Information (Detail) (USD $)			3 Months Ended		1 Months Ended
	Mar. 29, 2013	Dec. 31, 2012	Mar. 29, 2013 HFC business [Member]	Mar. 29, 2013 Aurora [Member]	Mar. 05, 2013 Aurora [Member] HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds from sale of cable access HFC business					$ 46,000,000
Net gain from sale of HFC business					15,000,000
TSA billing to Aurora				328,000
Prepaid expenses and other current assets	28,977,000	23,636,000		1,700,000
Receivables from customers				3,000,000
Accrued liabilities				1,400,000
Payable to third party vendors for purchases				2,900,000
Goodwill impairment loss			0
Carrying value of goodwill based on the fair value	$ 14,547,000		$ 14,547,000

XML

Credit Facilities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 29, 2013
Debt Instrument [Line Items]
Maximum borrowing capacity under bank line of credit facility	$ 10,000,000
Bank line of credit facility, maturity date	Aug. 23, 2013
Amounts outstanding under bank line of credit facility	0
Borrowings under bank line of credit facility	$ 0
Unrestricted cash, cash equivalents and short term investments to current liabilities ratio	Maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00.
Line of credit facility financial covenant terms	4.97 to 1
Interest rate	3.25%
Annualized rate of LIBOR	0.20%
LIBOR rate duration	One month borrowing period at March 29, 2013
Credit facility collateral	Borrowings are not collateralized
Covenants under the line of credit facility	At March 29, 2013, Harmonic was in compliance with the covenants under the line of credit facility
Minimum [Member]
Debt Instrument [Line Items]
Percentage added to LIBOR to facilitate line of credit	1.75%
Maximum [Member]
Debt Instrument [Line Items]
Percentage added to LIBOR to facilitate line of credit	1.95%

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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Equity [Abstract]
Foreign currency translation adjustments	$ (1,126)	$ (502)
Unrealized gain on investments	45	37
Accumulated Other Comprehensive Loss	$ (1,081)	$ (465)

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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Benefit from income taxes	$ (5,467,000)	$ (626,000)
Federal statutory income tax rate	35.00%	35.00%
Gross unrecognized tax benefits including interest and penalties	60,800,000		59,200,000
Net increase in interest and penalties related to uncertain tax positions	600,000
Interest and possible penalties related to uncertain tax positions	$ 7,700,000

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Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 221,704	$ 221,704
Accumulated Amortization	(170,290)	(163,257)
Total	51,414	58,447
Developed core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	136,145	136,145
Accumulated Amortization	(107,394)	(102,449)
Total	28,751	33,696
Customer relationships/contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,098	67,098
Accumulated Amortization	(49,580)	(48,150)
Total	17,518	18,948
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,361	11,361
Accumulated Amortization	(9,500)	(9,145)
Total	1,861	2,216
Maintenance agreements and related relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,100	7,100
Accumulated Amortization	(3,816)	(3,513)
Total	$ 3,284	$ 3,587

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Recent Accounting Pronouncements

3 Months Ended

Mar. 29, 2013

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Pronouncements

NOTE 2: RECENT ACCOUNTING PRONOUNCEMENTS

In December 2011, the FASB issued Accounting Standard Update (“ASU”) 2011-11, “Disclosures about offsetting assets and liabilities”. This guidance enhances disclosure requirements about the nature of an entity’s right to offset. The new guidance requires the disclosure of the gross amounts subject to rights of set-off, amounts offset in accordance with the accounting standards followed, and the related net exposure. The new guidance became effective for the Company beginning in the first quarter of fiscal 2013 and it did not have any impact on the Company’s Consolidated Financial Statements.

In July 2012, the FASB issued ASU 2012-2, “Intangibles - Goodwill and Other”, which allows an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived asset is impaired for determining whether it is necessary to perform the quantitative impairment test. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013, and it did not have any impact on the Company’s Consolidated Financial Statements.

In February 2013, the FASB issued ASU 2013-2, “Comprehensive Income”, which requires reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. The Company adopted this new guidance in the first quarter of 2013 and included the required disclosures.

In March 2013, the FASB issued ASU 2013-4, “Obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date”. The update provides requirements for the recognition, measurement and disclosure of an entity’s reasonable expectation of its obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. This guidance requires an entity to disclose the nature and amount of any such obligation as well as other information about the obligation. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-04 will have a material impact on its financial position, results of operations or cash flows.

On March 5, 2013, the FASB issued ASU 2013-05, “Parent’s Accounting for the Cumulative Translation Adjustment upon De-recognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity”. The ASU addresses accounting for a cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-05 will have a material impact on its financial position, results of operations or cash flows.

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Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Numerator:
Loss from continuing operations	$ (9,503)	$ (8,735)
Income from discontinued operations	15,924	1,207
Net Income (loss)	$ 6,421	$ (7,528)
Denominator:
Basic and diluted weighted average number of shares outstanding	115,219	117,275
Basic and diluted net income (loss) per share from:
Continuing operations	$ (0.08)	$ (0.07)
Discontinued operations	$ 0.14	$ 0.01
Net Income (loss)	$ 0.06	$ (0.06)

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Short-Term Investments - Additional Information (Detail) (USD $)	Mar. 29, 2013
Investments Debt And Equity Securities [Abstract]
Available-for-sale securities	$ 0

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Goodwill and Identified Intangible Assets (Tables)

3 Months Ended

Mar. 29, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the three months ended March 29, 2013 are as follows (in thousands):

Balance at beginning of period	$	212,518
Reduction in goodwill associated with the sale of the cable access HFC Business		(14,547	)
Foreign currency translation adjustment		(151	)
Balance at end of period	$	197,820

Summary of Goodwill and Identified Intangible Assets

The following is a summary of identified intangible assets (in thousands):

	March 29, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Identifiable intangibles:
Developed core technology	$	136,145	$	(107,394	)	$	28,751	$	136,145	$	(102,449	)	$	33,696
Customer relationships/contracts		67,098		(49,580	)		17,518		67,098		(48,150	)		18,948
Trademarks and tradenames		11,361		(9,500	)		1,861		11,361		(9,145	)		2,216
Maintenance agreements and related relationships		7,100		(3,816	)		3,284		7,100		(3,513	)		3,587
Total identifiable intangibles	$	221,704	$	(170,290	)	$	51,414	$	221,704	$	(163,257	)	$	58,447

Amortization Expense for Identifiable Purchased Intangible Assets

Amortization expense for the identifiable purchased intangible assets for the three months ended March 29, 2013 and March 30, 2012 was allocated as follows (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Included in cost of revenue	$	4,945	$	5,360
Included in operating expenses		2,088		2,179
Total amortization expense	$	7,033	$	7,539

Estimated Future Amortization Expense of Purchased Intangible Assets

The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):

	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2013 (remaining 9 months)	$	14,288	$	6,008	$	20,296
2014		13,745		6,775		20,520
2105		719		5,783		6,502
2016		—		4,096		4,096
2017		—		—		—
Total future amortization expense	$	28,752	$	22,662	$	51,414

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Balance Sheet Components (Tables)

3 Months Ended

Mar. 29, 2013

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Accounts Receivable, Net

	March 29, 2013			December 31, 2012
Accounts receivable, net
Accounts receivable	$	105,497		$	95,515
Less: allowances for doubtful accounts, returns and discounts		(9,805	)		(9,595	)
	$	95,692		$	85,920

Inventories

Inventories:
Raw materials	$	4,579	$	10,731
Work-in-process		2,850		4,347
Finished goods		38,956		49,192
	$	46,385	$	64,270

Property and Equipment, Net

Property and equipment, net:
Furniture and fixtures	$	7,902		$	7,856
Machinery and equipment		105,499			108,262
Leasehold improvements		7,387			7,612
		120,788			123,730
Less: accumulated depreciation and amortization		(83,587	)		(85,608	)
	$	37,201		$	38,122

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Employee Benefit Plans - Summary of Restricted Stock Units Outstanding (Detail) (Restricted Stock Units Outstanding [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Restricted Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Underlying Restricted Stock Units	3,622
Weighted Average Remaining Vesting Period (Years)	1 year 2 months 12 days
Aggregate Fair Value	$ 20,972

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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	$ 174,897	$ 166,392
Total liabilities measured and recorded at fair value	63	143
Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	72,375	59,931
Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	102,522	106,461
Total liabilities measured and recorded at fair value	63	143
Cash equivalents [Member] | Money market funds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	62,370	54,923
Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	2,002	3,005
Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value		3,614
Cash equivalents [Member] | Level 1 [Member] | Money market funds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	62,370	54,923
Cash equivalents [Member] | Level 1 [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	2,002	3,005
Cash equivalents [Member] | Level 2 [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value		3,614
Short-term investments [Member] | U.S. federal government bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	8,003	2,003
Short-term investments [Member] | Certificates of deposit [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	1,605	1,603
Short-term investments [Member] | State, municipal and local government agencies bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	59,191	59,050
Short-term investments [Member] | Corporate bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	31,047	31,562
Short-term investments [Member] | Commercial paper [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	9,944	10,288
Short-term investments [Member] | Level 1 [Member] | U.S. federal government bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	8,003	2,003
Short-term investments [Member] | Level 2 [Member] | Certificates of deposit [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	1,605	1,603
Short-term investments [Member] | Level 2 [Member] | State, municipal and local government agencies bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	59,191	59,050
Short-term investments [Member] | Level 2 [Member] | Corporate bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	31,047	31,562
Short-term investments [Member] | Level 2 [Member] | Commercial paper [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	9,944	10,288
Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	735	344
Prepaids and other current assets [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total assets measured and recorded at fair value	735	344
Accrued liabilities [Member] | Foreign exchange forward contracts [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total liabilities measured and recorded at fair value	63	143
Accrued liabilities [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total liabilities measured and recorded at fair value	$ 63	$ 143

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Restructuring and Related Charges (Tables)

3 Months Ended

Mar. 29, 2013

Activities in Restructuring Accrual

The following table summarizes the activity in the Harmonic Q1’13 restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Impairment of Leasehold improvement			Total
Balance at December 31, 2012	$	—		$	—		$	—
Restructuring charges in continuing operations		464			101			565
Cash payments		(247	)		—			(247	)
Non-cash write-offs		—			(101	)		(101	)
Balance at March 29, 2013		217			—			217

Omneon Restructuring [Member]

Activities in Restructuring Accrual

The following table summarizes the activity in the Omneon restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Excess Facilities
Balance at December 31, 2012	$	869
Cash payments		(455	)
Accretion		20
Balance at March 29, 2013		434

HFC business [Member]

Activities in Restructuring Accrual

The following table summarizes the activity in the HFC restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Contract termination		Total
Balance at December 31, 2012	$	—		$	—	$	—
Restructuring charges in discontinued operations		243			124		367
Cash payments		(165	)		—		(165	)
Balance at March 29, 2013		78			124		202

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 29, 2013

Compensation And Retirement Disclosure [Abstract]

Summary of Company's Stock Option and Restricted Stock Unit Activity

The following table summarizes the Company’s stock option and RSU unit activity during the three months ended March 29, 2013 (in thousands, except per share amounts):

				Stock Options Outstanding					Restricted Stock Units Outstanding
	Shares Available for Grant			Number of Shares			Weighted Average Exercise Price		Number of Units			Weighted Average Grant Date Fair Value
Balance at December 31, 2012		10,155			8,900		$	6.83		3,938		$	6.44
Authorized		—			—			—		—			—
Granted		(2,914	)		1,251			5.77		1,109			5.75
Options exercised		—			(191	)		2.95		—			—
Shares released		—			—			—		(918	)		6.06
Forfeited or cancelled		944			(630	)		6.18		(213	)		6.82
Balance at March 29, 2013		8,185			9,330		$	6.81		3,916		$	6.32

Summary of Stock Options Outstanding

The following table summarizes information about stock options outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Vested and expected to vest		9,071	$	6.83		3.4	$	3,053
Exercisable		6,518		7.17		2.4		2,187

Summary of Restricted Stock Units Outstanding

The following table summarizes information about restricted stock units outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares Underlying Restricted Stock Units		Weighted Average Remaining Vesting Period (Years)		Aggregate Fair Value (1)
Vested and expected to vest		3,622		1.2	$	20,972

(1) Represents the fair value of the Company’s common stock as of March 29, 2013, times the number of restricted stock units vested and expected to vest as of the same date.

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Basis of Presentation and Significant Accounting Policies

3 Months Ended

Mar. 29, 2013

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

NOTE 1: BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation. The accompanying unaudited condensed consolidated financial statements, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) which Harmonic Inc. (“Harmonic,” or the “Company”) considers necessary for a fair statement of the results of operations for the interim periods covered and the consolidated financial condition of the Company at the date of the balance sheets. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K, which was filed with the Securities and Exchange Commission on March 1, 2013 (“2012 Form 10-K”). The interim results presented herein are not necessarily indicative of the results of operations that may be expected for the full fiscal year ending December 31, 2013, or any other future period. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter which ends on December 31.

The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The year-end condensed balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“US GAAP”).

Discontinued Operations. On March 5, 2013, the Company completed the sale of its cable access HFC business to Aurora Networks (“Aurora”) for $46.0 million in cash. The Consolidated Statements of Operations have been retrospectively adjusted to present the cable access HFC business as discontinued operations, as described in “Note 3 Discontinued Operations”. Unless noted otherwise, all discussions herein with respect to the Company’s unaudited condensed consolidated financial statements relate to the Company’s continuing operations.

Use of Estimates. The preparation of the consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.

Significant Accounting Policies. The Company’s significant accounting policies are described in Note 2 to its audited Consolidated Financial Statements included in its 2012 Form 10-K. There have been no significant changes to these policies during the three months ended March 29, 2013.

Reclassifications. From time to time the Company reclassifies certain prior period balances to conform to the current year presentation. These reclassifications have no material impact on previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 29, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Stock-based compensation in:
Cost of revenue	$	611	$	753
Research and development expense		1,203		1,655
Selling, general and administrative expense		2,085		2,259
Total stock-based compensation in operating expense		3,288		3,914
Total stock-based compensation	$	3,899	$	4,667

Valuation Assumptions for Stock Options

The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		4.70			4.70
Volatility		52	%		58	%
Risk-free interest rate		0.8	%		1.0	%
Expected dividends		0.0	%		0.0	%

Employee Stock Purchase Plan

The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		0.49			0.50
Volatility		32	%		53	%
Risk-free interest rate		0.2	%		0.2	%
Expected dividends		0.0	%		0.0	%

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Discontinued Operations - Revenues and Components of Net Income Related to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Add: Gain on disposal, net of tax	$ 14,956
Income from discontinued operations, net of taxes	15,924	1,207
HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	9,556	11,282
Operating income	834	1,226
Less: (Benefit from) provision for income taxes	(134)	19
Add: Gain on disposal, net of tax	14,956
Income from discontinued operations, net of taxes	$ 15,924	$ 1,207

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Employee Benefit Plans - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Shares Available for Grant, Beginning balance	10,155
Shares Available for Grant, Authorized
Shares Available for Grant, Granted	(2,914)
Shares Available for Grant, Options exercised
Shares Available for Grant, Shares released
Shares Available for Grant, Forfeited or cancelled	944
Shares Available for Grant, Ending balance	8,185
Restricted Stock Units Outstanding [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Number of Units, Beginning balance	3,938
Number of Shares, Authorized
Number of Units, Granted	1,109
Number of Units, Shares released	(918)
Number of Units, Forfeited or cancelled	(213)
Number of Units, Ending balance	3,916
Weighted Average Grant Date Fair Value, Beginning balance	6.44
Weighted Average Grant Date Fair Value, Authorized
Weighted Average Grant Date Fair Value, Granted	5.75
Weighted Average Grant Date Fair Value, Shares released	6.06
Weighted Average Grant Date Fair Value, Forfeited or cancelled	6.82
Weighted Average Grant Date Fair Value, Ending balance	6.32
Stock Options Outstanding [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Number of Shares, Beginning balance	8,900
Number of Shares, Authorized
Number of Shares, Granted	1,251
Number of Shares, Options exercised	(191)
Number of Shares, Forfeited or cancelled	(630)
Number of Shares, Ending balance	9,330
Weighted Average Exercise Price, Beginning balance	6.83
Weighted Average Exercise Price, Authorized
Weighted Average Exercise Price, Granted	5.77
Weighted Average Exercise Price, Options exercised	2.95
Weighted Average Exercise Price, Forfeited or cancelled	6.18
Weighted Average Exercise Price, Ending balance	6.81

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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 118,464	$ 96,670
Short-term investments	109,790	104,506
Accounts receivable, net	95,692	85,920
Inventories	46,385	64,270
Deferred income taxes	20,145	21,870
Prepaid expenses and other current assets	28,977	23,636
Total current assets	419,453	396,872
Property and equipment, net	37,201	38,122
Goodwill	197,820	212,518
Intangibles, net	51,414	58,447
Other assets	9,256	11,572
Total assets	715,144	717,531
Current liabilities:
Accounts payable	22,815	25,447
Income taxes payable		1,797
Deferred revenue	31,575	33,235
Accrued liabilities	42,294	42,415
Total current liabilities	96,684	102,894
Income taxes payable, long-term	50,669	49,309
Other non-current liabilities	11,732	11,915
Total liabilities	159,085	164,118
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value, 150,000 shares authorized; 114,336 and 114,193 shares issued and outstanding at March 29, 2013 and December 31, 2012, respectively	114	114
Additional paid-in capital	2,429,631	2,432,790
Accumulated deficit	(1,872,605)	(1,879,026)
Accumulated other comprehensive loss	(1,081)	(465)
Total stockholders' equity	556,059	553,413
Total liabilities and stockholders' equity	$ 715,144	$ 717,531

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Balance Sheet Components - Accounts Receivable, Net, Inventories, Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Accounts receivable, net
Accounts receivable	$ 105,497	$ 95,515
Less: allowances for doubtful accounts, returns and discounts	(9,805)	(9,595)
Accounts receivable, net	95,692	85,920
Inventories:
Raw materials	4,579	10,731
Work-in-process	2,850	4,347
Finished goods	38,956	49,192
Total inventories, net	46,385	64,270
Property and equipment, net:
Furniture and fixtures	7,902	7,856
Machinery and equipment	105,499	108,262
Leasehold improvements	7,387	7,612
Property, Plant and Equipment Gross, Total	120,788	123,730
Less: accumulated depreciation and amortization	(83,587)	(85,608)
Property and equipment, net	$ 37,201	$ 38,122

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Statement Of Partners Capital [Abstract]
Net income (loss)	$ 6,421	$ (7,528)
Other comprehensive income (loss), net of tax:
Changes in cumulative translation adjustments	(624)	314
Foreign currency translation adjustments	(624)	314
Changes in unrealized gain (loss) on investment arising during the period	5	39
Gain on investments	5	39
Other comprehensive (loss) income before tax	(619)	353
Income tax (benefit) provision related to items of other comprehensive income (loss)	(3)	15
Other comprehensive income (loss), net of tax	(616)	338
Comprehensive income (loss)	$ 5,805	$ (7,190)

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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%
Weighted-average fair value per share of options granted	$ 2.50	$ 2.94
Fair value of options vested	$ 1.3	$ 2.1
Total realized tax benefit		0.1
Total unamortized stock-based compensation cost related to unvested stock options and restricted stock units	28.2
Remaining weighted-average amortization period	2 years 3 months 18 days
Restricted Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stocks fair value	$ 5.6	$ 5.4
Weighted-average fair value per share other than option granted	$ 5.75
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Discount percentage on purchase of stock	15.00%
Value of stock purchase rights percentage of call option	85.00%
Value of stock purchase rights percentage of put option	15.00%
Weighted-average fair value per share other than option granted	$ 1.20	$ 1.50

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Stockholders' Equity (Tables)

3 Months Ended

Mar. 29, 2013

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss were as follows (in thousands):

	March 29, 2013			December 31, 2012
Foreign currency translation adjustments	$	(1,126	)	$	(502	)
Unrealized gain on investments		45			37
Accumulated Other Comprehensive Loss	$	(1,081	)	$	(465	)

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Commitments and Contingencies - Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013
Commitments And Contingencies Disclosure [Abstract]
2013 (remaining nine months)	$ 7,616
2014	7,495
2015	7,042
2016	7,235
2017	7,360
Thereafter	20,398
Total	$ 57,146

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Stockholders' Equity

3 Months Ended

Mar. 29, 2013

Equity [Abstract]

Stockholders' Equity

NOTE 15: STOCKHOLDERS’ EQUITY

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss were as follows (in thousands):

	March 29, 2013			December 31, 2012
Foreign currency translation adjustments	$	(1,126	)	$	(502	)
Unrealized gain on investments		45			37
Accumulated Other Comprehensive Loss	$	(1,081	)	$	(465	)

Common Stock Repurchases

On January 28, 2013, our Board of Directors approved a $75 million increase to our existing $25 million stock repurchase program. On February 19, 2013, the Board approved a further $35 million increase to the program upon the closing of a sale of the Company’s cable access HFC business, which closed on March 5, 2013. The Board authorized aggregate repurchases under the program of $135 million, approximately $31.9 million of which had been utilized for repurchases as of March 29, 2013. Under the program, we are authorized to repurchase shares of common stock in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing and actual number of shares repurchased, if any, depends on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The program may be suspended or discontinued at any time without prior notice.

During the three months ended March 29, 2013, the Company repurchased and retired approximately 1.6 million shares of common stock at an average price of $5.76 per share, for an aggregate purchase prices of approximately $9.3 million, leaving approximately $103.1 million available for purchases under the program as of March 29, 2013. The Company charges the excess of cost over par value for the repurchase of its common stock to additional paid-in capital.

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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (HFC business [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 05, 2013	Mar. 29, 2013
HFC business [Member]
Summary Of Significant Accounting Policies [Line Items]
Business sold for cash agreed by the company	$ 46,000	$ 46,000

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Basis of Presentation and Significant Accounting Policies (Policies)

3 Months Ended

Mar. 29, 2013

Basis of Presentation

Basis of Presentation. The accompanying unaudited condensed consolidated financial statements, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) which Harmonic Inc. (“Harmonic,” or the “Company”) considers necessary for a fair statement of the results of operations for the interim periods covered and the consolidated financial condition of the Company at the date of the balance sheets. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K, which was filed with the Securities and Exchange Commission on March 1, 2013 (“2012 Form 10-K”). The interim results presented herein are not necessarily indicative of the results of operations that may be expected for the full fiscal year ending December 31, 2013, or any other future period. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter which ends on December 31.

The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The year-end condensed balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“US GAAP”).

Discontinued Operations

Discontinued Operations. On March 5, 2013, the Company completed the sale of its cable access HFC business to Aurora Networks (“Aurora”) for $46.0 million in cash. The Consolidated Statements of Operations have been retrospectively adjusted to present the cable access HFC business as discontinued operations, as described in “Note 3 Discontinued Operations”. Unless noted otherwise, all discussions herein with respect to the Company’s unaudited condensed consolidated financial statements relate to the Company’s continuing operations.

Use of Estimates

Use of Estimates. The preparation of the consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.

Significant Accounting Policies

Significant Accounting Policies. The Company’s significant accounting policies are described in Note 2 to its audited Consolidated Financial Statements included in its 2012 Form 10-K. There have been no significant changes to these policies during the three months ended March 29, 2013.

Reclassifications

Reclassifications. From time to time the Company reclassifies certain prior period balances to conform to the current year presentation. These reclassifications have no material impact on previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.

Recent Accounting Pronouncements

RECENT ACCOUNTING PRONOUNCEMENTS

In December 2011, the FASB issued Accounting Standard Update (“ASU”) 2011-11, “Disclosures about offsetting assets and liabilities”. This guidance enhances disclosure requirements about the nature of an entity’s right to offset. The new guidance requires the disclosure of the gross amounts subject to rights of set-off, amounts offset in accordance with the accounting standards followed, and the related net exposure. The new guidance became effective for the Company beginning in the first quarter of fiscal 2013 and it did not have any impact on the Company’s Consolidated Financial Statements.

In July 2012, the FASB issued ASU 2012-2, “Intangibles - Goodwill and Other”, which allows an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived asset is impaired for determining whether it is necessary to perform the quantitative impairment test. The guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013, and it did not have any impact on the Company’s Consolidated Financial Statements.

In February 2013, the FASB issued ASU 2013-2, “Comprehensive Income”, which requires reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. The Company adopted this new guidance in the first quarter of 2013 and included the required disclosures.

In March 2013, the FASB issued ASU 2013-4, “Obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date”. The update provides requirements for the recognition, measurement and disclosure of an entity’s reasonable expectation of its obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. This guidance requires an entity to disclose the nature and amount of any such obligation as well as other information about the obligation. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-04 will have a material impact on its financial position, results of operations or cash flows.

On March 5, 2013, the FASB issued ASU 2013-05, “Parent’s Accounting for the Cumulative Translation Adjustment upon De-recognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity”. The ASU addresses accounting for a cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for the Company beginning in the first quarter of fiscal 2014 and should be applied prospectively. The Company does not expect the adoption of ASU 2013-05 will have a material impact on its financial position, results of operations or cash flows.

Impairment of Investments

Impairment of Investments

The Company monitors its investment portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. A decline of fair value below amortized costs of debt securities is considered other-than temporary if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. At the present time, the Company does not intend to sell its investments that have unrealized losses in accumulated other comprehensive loss. In addition, the Company does not believe that it is more likely than not that it will be required to sell its investments that have unrealized losses in accumulated other comprehensive loss before the Company recovers the principal amounts invested. The Company believes that the unrealized losses are temporary and do not require an-other-than-temporary impairment, based on its evaluation of available evidence as of March 29, 2013.

As of March 29, 2013, there were no individual available-for-sale securities in a material unrealized loss position and the amount of unrealized losses on the total investment balance was insignificant.

Fair Value of Financial Instruments

Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.

• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company primarily uses broker quotes for valuation of its short-term investments. The forward exchange contracts are classified as Level 2 because they are valued using quoted market prices and other observable data for similar instruments in an active market.

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

The Company uses the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. During the three months ended March 29, 2013, there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.

Share-based Compensation Expense

The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		4.70			4.70
Volatility		52	%		58	%
Risk-free interest rate		0.8	%		1.0	%
Expected dividends		0.0	%		0.0	%

The expected term represents the weighted-average period that the stock options are expected to remain outstanding. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.

The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods.

The value of the stock purchase rights under the Company’s Employee Stock Purchase Plan (“ESPP”) consists of: (1) the 15% discount on the purchase of the stock; (2) 85% of the fair value of the call option; and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		0.49			0.50
Volatility		32	%		53	%
Risk-free interest rate		0.2	%		0.2	%
Expected dividends		0.0	%		0.0	%

The expected term represents the period of time from the beginning of the offering period to the purchase date. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model

Income Tax

The income tax provision includes federal, state and local, and foreign income taxes and is based on the application of a forecasted annual income tax rate applied to the current quarter’s year-to-date pre-tax income (loss). In determining the estimated annual effective income tax rate, the Company estimates the annual impact of certain factors, including projections of the Company’s annual earnings, taxing jurisdictions in which the earnings will be generated, state and local income taxes, the Company’s ability to use tax credits and net operating loss carryforwards, and available tax planning alternatives. Discrete items, including the effect of changes in tax laws, tax rates, and certain circumstances with respect to valuation allowances or other unusual or non-recurring tax adjustments, are reflected in the period in which they occur as an addition to, or reduction from, the income tax provision, rather than being included in the estimated annual effective income tax rate.

In compliance with applicable guidance for accounting for uncertainty in income taxes, the Company had gross unrecognized tax benefits, which include interest and penalties, of approximately $59.2 million as of December 31, 2012, and approximately $60.8 million as of March 29, 2013. If all of these unrecognized tax benefits were recognized, the entire amount would impact the provision for income taxes. The unrecognized tax benefits may decrease significantly within the next 12 months if related statutes of limitation that are to expire during that period are not extended.

The Company recognizes interest and possible penalties related to uncertain tax positions in income tax expense. During the three months ended March 29, 2013, the Company recorded a net increase of $0.6 million for interest and possible penalties related to uncertain tax positions, resulting in a balance at March 29, 2013 of $7.7 million.

Discontinued Operations [Member]

Discontinued Operations

In accordance with ASC 205 “Presentation of financial statements – Discontinued Operations”, a business is classified as a discontinued operation when : (i) the operations and cash flows of the business can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the business has either been disposed of or is classified as held for sale; and (iii) the Company will not have any significant continuing involvement in the operations of the business after the disposal transactions.

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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	Feb. 19, 2013	Jan. 28, 2013	Mar. 29, 2013
Stock Repurchase Program [Line Items]
Authorized stock repurchase value		$ 25	$ 135
Common stock repurchased and retired, shares			1.6
Common stock repurchased and retired, per shares value			$ 5.76
Common stock repurchased and retired, aggregate value			9.3
Common stock repurchase program, authorized amount remaining			103.1
Common Stock [Member]
Stock Repurchase Program [Line Items]
Increase in stock repurchase program	$ 35.0	$ 75.0	$ 31.9

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 6,421	$ (7,528)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	7,033	7,539
Depreciation	4,040	3,798
Stock-based compensation	3,986	4,800
Gain on sale of discontinued operations, net of tax	(14,956)
Loss on impairment of fixed assets	101
Deferred income taxes	(204)	(1,262)
Provision for inventories	567	784
Allowance for doubtful accounts, returns and discounts	1,116	(180)
Excess tax benefits from stock-based compensation		(73)
Other non-cash adjustments, net	408	(8)
Changes in assets and liabilities:
Accounts receivable	(10,888)	(1,683)
Inventories	6,832	4,320
Prepaid expenses and other assets	(8,597)	1,892
Accounts payable	(2,796)	936
Deferred revenue	2,667	2,740
Income taxes payable	(1,257)	(929)
Accrued and other liabilities	(216)	(7,255)
Net cash (used in) provided by operating activities	(5,743)	7,891
Cash flows from investing activities:
Purchases of investments	(25,908)	(36,654)
Proceeds from maturities of investments	16,249	18,791
Proceeds from sales of investments	4,000	1,042
Acquisition of property and equipment	(4,274)	(3,715)
Proceeds from sale of discontinued operations, net of selling costs	44,336
Net cash provided by (used in) investing activities	34,403	(20,536)
Cash flows from financing activities:
Payments for repurchase of common stock	(9,268)
Proceeds from issuance of common stock, net	2,508	2,479
Excess tax benefits from stock-based compensation		73
Net cash (used in) provided by financing activities	(6,760)	2,552
Effect of exchange rate changes on cash and cash equivalents	(106)	129
Net increase (decrease) in cash and cash equivalents	21,794	(9,964)
Cash and cash equivalents at beginning of period	96,670	90,983
Cash and cash equivalents at end of period	$ 118,464	$ 81,019

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	114,336	114,193
Common stock, shares outstanding	114,336	114,193

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Employee Benefit Plans

3 Months Ended

Mar. 29, 2013

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

NOTE 10: EMPLOYEE BENEFIT PLANS

Harmonic grants stock options and restricted stock units (“RSUs”) pursuant to stockholder approved equity incentive plans. These equity incentive plans are described in detail in Note 13, Employee Benefit Plans, of Notes to Consolidated Financial Statements in the 2012 Form 10-K

Stock Options and Restricted Stock Units. The following table summarizes the Company’s stock option and RSU unit activity during the three months ended March 29, 2013 (in thousands, except per share amounts):

				Stock Options Outstanding					Restricted Stock Units Outstanding
	Shares Available for Grant			Number of Shares			Weighted Average Exercise Price		Number of Units			Weighted Average Grant Date Fair Value
Balance at December 31, 2012		10,155			8,900		$	6.83		3,938		$	6.44
Authorized		—			—			—		—			—
Granted		(2,914	)		1,251			5.77		1,109			5.75
Options exercised		—			(191	)		2.95		—			—
Shares released		—			—			—		(918	)		6.06
Forfeited or cancelled		944			(630	)		6.18		(213	)		6.82
Balance at March 29, 2013		8,185			9,330		$	6.81		3,916		$	6.32

The following table summarizes information about stock options outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Vested and expected to vest		9,071	$	6.83		3.4	$	3,053
Exercisable		6,518		7.17		2.4		2,187

The intrinsic value of options vested and expected to vest and exercisable as of March 29, 2013 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of March 29, 2013. The intrinsic value of options exercised during the three months ended March 29, 2013 was $0.5 million and is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of the exercise date.

The following table summarizes information about restricted stock units outstanding as of March 29, 2013 (in thousands, except per share amounts):

	Number of Shares Underlying Restricted Stock Units		Weighted Average Remaining Vesting Period (Years)		Aggregate Fair Value (1)
Vested and expected to vest		3,622		1.2	$	20,972

(1) Represents the fair value of the Company’s common stock as of March 29, 2013, times the number of restricted stock units vested and expected to vest as of the same date.

401-K Plan. Harmonic has a retirement/savings plan which qualifies as a thrift plan under Section 401(k) of the Internal Revenue Code. This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Prior to 2009, Harmonic made discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Harmonic’s contributions were suspended from 2009 through 2012, but have been renewed, on the same basis, for 2013.

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Document and Entity Information	3 Months Ended
	Mar. 29, 2013	Apr. 19, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 29, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	HLIT
Entity Registrant Name	HARMONIC INC
Entity Central Index Key	0000851310
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		113,262,063

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Stock-Based Compensation

3 Months Ended

Mar. 29, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE 11: STOCK-BASED COMPENSATION

Stock-based compensation expense consists primarily of expenses for stock options and restricted stock units granted to employees and shares issued under the Employee Stock Purchase Plan. The following table summarizes stock-based compensation expense (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Stock-based compensation in:
Cost of revenue	$	611	$	753
Research and development expense		1,203		1,655
Selling, general and administrative expense		2,085		2,259
Total stock-based compensation in operating expense		3,288		3,914
Total stock-based compensation	$	3,899	$	4,667

Stock Options

The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		4.70			4.70
Volatility		52	%		58	%
Risk-free interest rate		0.8	%		1.0	%
Expected dividends		0.0	%		0.0	%

The expected term represents the weighted-average period that the stock options are expected to remain outstanding. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.

The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods.

The weighted-average fair value per share of options granted for the three months ended March 29, 2013 and March 30, 2012 was $2.50 and $2.94 per share, respectively. The fair value of all stock options vested during the three months ended March 29, 2013 and March 30, 2012 was $1.3 million and $2.1 million, respectively.

The total realized tax benefit attributable to stock options exercised during the three months ended March 30, 2012, in jurisdictions where this expense is deductible for tax purposes, was $0.1 million. The Company did not recognize any tax benefit attributable to stock options exercised during the three months ended March 29, 2013.

Restricted Stock Units

The estimated fair value of restricted stock units is based on the market price of the Company’s common stock on the grant date. The fair value of all restricted stock units issued during the three months ended March 29, 2013 and March 30, 2012 was $5.6 million and $5.4 million, respectively.

Employee Stock Purchase Plan

The value of the stock purchase rights under the Company’s Employee Stock Purchase Plan (“ESPP”) consists of: (1) the 15% discount on the purchase of the stock; (2) 85% of the fair value of the call option; and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:

	Three months ended
	March 29, 2013			March 30, 2012
Expected term (years)		0.49			0.50
Volatility		32	%		53	%
Risk-free interest rate		0.2	%		0.2	%
Expected dividends		0.0	%		0.0	%

The expected term represents the period of time from the beginning of the offering period to the purchase date. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.

The weighted-average fair value per share of stock purchase rights under the ESPP granted for the three months ended March 29, 2013 and March 30, 2012 was $1.20 and $1.50, respectively.

Unrecognized Stock-Based Compensation

As of March 29, 2013, total unamortized stock-based compensation cost related to unvested stock options and restricted stock units was $28.2 million. This amount will be recognized as expense using the straight-line attribution method over the remaining weighted-average amortization period of 2.3 years.

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Income Statement [Abstract]
Product revenue	$ 82,475	$ 99,498
Service revenue	19,197	16,941
Net revenue	101,672	116,439
Product cost of revenue	45,237	59,176
Service cost of revenue	10,270	6,801
Total cost of revenue	55,507	65,977
Gross profit	46,165	50,462
Operating expenses:
Research and development	25,251	26,763
Selling, general and administrative	33,269	31,403
Amortization of intangibles	2,088	2,179
Restructuring and related charges	424
Total operating expenses	61,032	60,345
Loss from operations	(14,867)	(9,883)
Interest income, net	64	119
Other income (expense), net	(167)	403
Loss from continuing operations before income taxes	(14,970)	(9,361)
Benefit from income taxes	(5,467)	(626)
Loss from continuing operations	(9,503)	(8,735)
Income from discontinued operations, net of tax (including gain on disposal of $14,956, net of tax, for the three months ended March 29, 2013)	15,924	1,207
Net Income (loss)	$ 6,421	$ (7,528)
Basic net income (loss) per share from:
Continuing operations	$ (0.08)	$ (0.07)
Discontinued operations	$ 0.14	$ 0.01
Net Income (loss)	$ 0.06	$ (0.06)
Diluted net income (loss) per share from:
Continuing operations	$ (0.08)	$ (0.07)
Discontinued operations	$ 0.14	$ 0.01
Net Income (loss)	$ 0.06	$ (0.06)
Shares used in per share calculation:
Basic	115,219	117,275
Diluted	115,219	117,275

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Fair Value Measurements

3 Months Ended

Mar. 29, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

NOTE 5: FAIR VALUE MEASUREMENTS

The applicable accounting guidance establishes a framework for measuring fair value and requires disclosure about the fair value measurements of assets and liabilities. This guidance requires the Company to classify and disclose assets and liabilities measured at fair value on a recurring basis, as well as fair value measurements of assets and liabilities measured on a nonrecurring basis in periods subsequent to initial measurement, in a three-tier fair value hierarchy as described below.

The guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants on the measurement date.

Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.

• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company primarily uses broker quotes for valuation of its short-term investments. The forward exchange contracts are classified as Level 2 because they are valued using quoted market prices and other observable data for similar instruments in an active market.

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

The Company uses the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. During the three months ended March 29, 2013, there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value as of March 29, 2013 and December 31, 2012, based on the three-tier fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3		Total
As of March 29, 2013
Cash equivalents
Money market funds	$	62,370	$	—	$	—	$	62,370
U.S. federal government bonds with maturity less than 90 days		2,002		—		—		2,002
Short-term investments
Certificates of deposit		—		1,605		—		1,605
State, municipal and local government agencies bonds		—		59,191		—		59,191
Corporate bonds		—		31,047		—		31,047
Commercial paper		—		9,944		—		9,944
U.S. federal government bonds		8,003		—		—		8,003
Prepaids and other current assets
Foreign exchange forward contracts		—		735		—		735
Total assets measured and recorded at fair value	$	72,375	$	102,522	$	—	$	174,897
Accrued liabilities
Foreign exchange forward contracts	$	—	$	63	$	—	$	63
Total liabilities measured and recorded at fair value	$	—	$	63	$	—	$	63
	Level 1		Level 2		Level 3		Total
As of December 31, 2012
Cash equivalents
Money market funds	$	54,923	$	—	$	—	$	54,923
Corporate bonds with maturity less than 90 days		—		3,614		—		3,614
U.S. federal government bonds with maturity less than 90 days		3,005		—		—		3,005
Short-term investments
Certificates of deposit		—		1,603		—		1,603
State, municipal and local government agencies bonds		—		59,050		—		59,050
Corporate bonds		—		31,562		—		31,562
Commercial paper		—		10,288		—		10,288
U.S. federal government bonds		2,003		—		—		2,003
Prepaids and other current assets
Foreign exchange forward contracts		—		344		—		344
Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
Accrued liabilities
Foreign exchange forward contracts	$	—	$	143	$	—	$	143
Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143

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Short-Term Investments

3 Months Ended

Mar. 29, 2013

Cash And Cash Equivalents [Abstract]

Short-Term Investments

NOTE 4: SHORT-TERM INVESTMENTS

The following table summarizes the Company’s short-term investments (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of March 29, 2013
Certificates of deposit	$	1,605	$	—	$	—		$	1,605
State, municipal and local government agencies bonds		59,137		56		(2	)		59,191
Corporate bonds		31,062		7		(22	)		31,047
Commercial paper		9,944		—		—			9,944
U.S. federal government bonds		8,003		1		(1	)		8,003
Total short-term investments	$	109,751	$	64	$	(25	)	$	109,790
As of December 31, 2012
Certificates of deposit	$	1,603	$	—	$	—		$	1,603
State, municipal and local government agencies bonds		59,009		45		(4	)		59,050
Corporate bonds		31,568		4		(10	)		31,562
Commercial paper		10,287		1		—			10,288
U.S. federal government bonds		2,003		—		—			2,003
Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506

The following table summarizes the maturities of the Company’s short-term investments (in thousands):

	March 29, 2013		December 31, 2012
Less than one year	$	84,402	$	76,779
Due in 1 - 2 years		25,388		27,727
Total short-term investments	$	109,790	$	104,506

Realized gains and losses from the sale of investments for the three months ended March 29, 2013 and March 30, 2012 were not material.

Impairment of Investments. The Company monitors its investment portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. A decline of fair value below amortized costs of debt securities is considered other-than temporary if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. At the present time, the Company does not intend to sell its investments that have unrealized losses in accumulated other comprehensive loss. In addition, the Company does not believe that it is more likely than not that it will be required to sell its investments that have unrealized losses in accumulated other comprehensive loss before the Company recovers the principal amounts invested. The Company believes that the unrealized losses are temporary and do not require an-other-than-temporary impairment, based on its evaluation of available evidence as of March 29, 2013.

As of March 29, 2013, there were no individual available-for-sale securities in a material unrealized loss position and the amount of unrealized losses on the total investment balance was insignificant.

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Subsequent Events

3 Months Ended

Mar. 29, 2013

Subsequent Events [Abstract]

Subsequent Events

NOTE 16: SUBSEQUENT EVENTS

On April 22, 2013, the Company announced that it expected to commence a modified “Dutch Auction” tender offer to purchase up to $100.0 million of its common stock at a price per share not less than $5.75 and not greater than $6.25. The tender offer commenced on April 26, 2013, and will expire on May 24, 2013, unless extended. The minimum number of shares that may be purchased in the tender offer represents approximately 14.1% of Harmonic’s currently outstanding common stock. Until the expiration of the tender offer, the Company has suspended its previously announced stock repurchase program.

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Income Taxes

3 Months Ended

Mar. 29, 2013

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 12: INCOME TAXES

The income tax provision includes federal, state and local, and foreign income taxes and is based on the application of a forecasted annual income tax rate applied to the current quarter’s year-to-date pre-tax income (loss). In determining the estimated annual effective income tax rate, the Company estimates the annual impact of certain factors, including projections of the Company’s annual earnings, taxing jurisdictions in which the earnings will be generated, state and local income taxes, the Company’s ability to use tax credits and net operating loss carryforwards, and available tax planning alternatives. Discrete items, including the effect of changes in tax laws, tax rates, and certain circumstances with respect to valuation allowances or other unusual or non-recurring tax adjustments, are reflected in the period in which they occur as an addition to, or reduction from, the income tax provision, rather than being included in the estimated annual effective income tax rate.

For the three months ended March 29, 2013, the Company recorded a benefit from income taxes of $5.5 million, compared to a benefit from income taxes of $0.6 million for the same period a year ago, inclusive of discrete items. The increase in the benefit from income taxes in the three months ended March 29, 2013, compared to the same period in 2012, was primarily attributable to the reinstatement of the federal R&D tax credit retroactively from January 1, 2012, and an increase in loss from continuing operations in the three months ended March 29, 2013, compared to the same period in 2012.

For the three months ended March 29, 2013, the difference between the recorded benefit from income taxes and the tax provision, based on the federal statutory rate of 35%, was primarily attributable to the net of various discrete items, the differential in foreign tax rates, non-deductible stock-based compensation expense and non-deductible amortization on foreign intangibles, and federal R&D credits. The discrete items recorded in the first three months of 2013 primarily related to the increase in the valuation allowance on California R&D tax credits, the reinstatement of the federal R&D tax credit, and accrued interest on uncertain tax positions.

For the three months ended March 30, 2012, the difference between the recorded benefit from income taxes and the tax provision, based on the federal statutory rate of 35%, was primarily attributable to the net of various discrete items, the differential in foreign tax rates, non-deductible stock-based compensation expense, and non-deductible amortization on foreign intangibles. The discrete items recorded in the first three months of 2012 related to accrued interest on uncertain tax positions, and foreign currency translation adjustments.

The Company files federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations during which such tax returns may be audited and adjusted by the relevant tax authorities. The 2008 through 2012 tax years generally remain subject to examination by federal and most state tax authorities. In significant foreign jurisdictions, the 2006 through 2012 tax years generally remain subject to examination by their respective tax authorities. The Company is under audit by the US Internal Revenue Service for the 2008, 2009 and 2010 tax years. In addition, the statute of limitations on our 2008 and 2009 U.S. corporate income tax return has been extended to September 2013. A subsidiary of the Company is under an audit, which commenced in the first quarter of 2012, by the Israel tax authority for the years 2007 through 2010. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the U.S. or Israel is for an amount in excess of the tax provision we have recorded in the applicable period, our overall tax expense, effective tax rate, operating results and cash flow could be materially and adversely impacted in the period of adjustment.

In compliance with applicable guidance for accounting for uncertainty in income taxes, the Company had gross unrecognized tax benefits, which include interest and penalties, of approximately $59.2 million as of December 31, 2012, and approximately $60.8 million as of March 29, 2013. If all of these unrecognized tax benefits were recognized, the entire amount would impact the provision for income taxes. The unrecognized tax benefits may decrease significantly within the next 12 months if related statutes of limitation that are to expire during that period are not extended.

The Company recognizes interest and possible penalties related to uncertain tax positions in income tax expense. During the three months ended March 29, 2013, the Company recorded a net increase of $0.6 million for interest and possible penalties related to uncertain tax positions, resulting in a balance at March 29, 2013 of $7.7 million.

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Restructuring and Related Charges

3 Months Ended

Mar. 29, 2013

Restructuring And Related Activities [Abstract]

Restructuring and Related Charges

NOTE 8: RESTRUCTURING AND RELATED CHARGES

Omneon Restructuring. The Company has restructuring accruals for excess lease facilities related to the closure of the Omneon headquarters in Sunnyvale, California. The accrual was based on future rent payments, net of expected sublease income, to be made through the end of the lease term in June 2013. The following table summarizes the activity in the Omneon restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Excess Facilities
Balance at December 31, 2012	$	869
Cash payments		(455	)
Accretion		20
Balance at March 29, 2013		434

HFC Restructuring. As a result of the sale of the cable access HFC business in March 2013, the Company recorded a $0.4 million restructuring charge, which was recorded under “Income from discontinued operations”. The restructuring charge was for $0.3 million of severance and benefits related to involuntary termination of nine employees and $0.1 million of contract termination costs. Three of the terminated employees are required to work to the end of the term of the Aurora TSA, and, therefore, the Company records their severance ratably over the service period. The following table summarizes the activity in the HFC restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Contract termination		Total
Balance at December 31, 2012	$	—		$	—	$	—
Restructuring charges in discontinued operations		243			124		367
Cash payments		(165	)		—		(165	)
Balance at March 29, 2013		78			124		202

The Company anticipates that the remaining restructuring accrual balance of $0.2 million will be paid out by the end of its third quarter of fiscal 2013. In addition, if Aurora elects to terminate any of the U.S. employees hired from the Company, on or before September 5, 2013, the Company has agreed to reimburse Aurora for the severance payments payable to such employees.

Harmonic Q1’13 Restructuring. The Company implemented a series of restructuring plans in the first quarter of fiscal 2013 to reduce costs and improve efficiencies. As a result, the Company recorded a restructuring charge of $0.6 million, of which $0.2 million is included in “Product cost of

revenue” and $0.4 million is included in “Operating expenses-restructuring and related charges” in the Consolidated Statements of Operations. The restructuring charge consisted of severance and benefits of $0.5 million related to the involuntary termination of thirty employees. In addition, the Company wrote–down, to its estimated net realizable value, leasehold improvements related to the Milpitas warehouse by $0.1 million. The following table summarizes the activity in the Harmonic Q1’13 restructuring accrual during the three months ended March 29, 2013 (in thousands):

	Severance			Impairment of Leasehold improvement			Total
Balance at December 31, 2012	$	—		$	—		$	—
Restructuring charges in continuing operations		464			101			565
Cash payments		(247	)		—			(247	)
Non-cash write-offs		—			(101	)		(101	)
Balance at March 29, 2013		217			—			217

The Company anticipates that the remaining restructuring accrual balance of $0.2 million will be paid out by the end of its third quarter of fiscal 2013.

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Stock-Based Compensation - Employee Stock Purchase Plan (Detail)	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	0.00%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	5 months 27 days	6 months
Volatility	32.00%	53.00%
Risk-free interest rate	0.20%	0.20%
Expected dividends	0.00%	0.00%

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Balance Sheet Components

3 Months Ended

Mar. 29, 2013

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Balance Sheet Components

NOTE 6: BALANCE SHEET COMPONENTS

The following tables provide details of selected balance sheet components (in thousands):

	March 29, 2013			December 31, 2012
Accounts receivable, net
Accounts receivable	$	105,497		$	95,515
Less: allowances for doubtful accounts, returns and discounts		(9,805	)		(9,595	)
	$	95,692		$	85,920
Inventories:
Raw materials	$	4,579		$	10,731
Work-in-process		2,850			4,347
Finished goods		38,956			49,192
	$	46,385		$	64,270
Property and equipment, net:
Furniture and fixtures	$	7,902		$	7,856
Machinery and equipment		105,499			108,262
Leasehold improvements		7,387			7,612
		120,788			123,730
Less: accumulated depreciation and amortization		(83,587	)		(85,608	)
	$	37,201		$	38,122

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Goodwill and Identified Intangible Assets

3 Months Ended

Mar. 29, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Identified Intangible Assets

NOTE 7: GOODWILL AND IDENTIFIED INTANGIBLE ASSETS

The changes in the carrying amount of goodwill for the three months ended March 29, 2013 are as follows (in thousands):

Balance at beginning of period	$	212,518
Reduction in goodwill associated with the sale of the cable access HFC Business		(14,547	)
Foreign currency translation adjustment		(151	)
Balance at end of period	$	197,820

The following is a summary of identified intangible assets (in thousands):

	March 29, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Identifiable intangibles:
Developed core technology	$	136,145	$	(107,394	)	$	28,751	$	136,145	$	(102,449	)	$	33,696
Customer relationships/contracts		67,098		(49,580	)		17,518		67,098		(48,150	)		18,948
Trademarks and tradenames		11,361		(9,500	)		1,861		11,361		(9,145	)		2,216
Maintenance agreements and related relationships		7,100		(3,816	)		3,284		7,100		(3,513	)		3,587
Total identifiable intangibles	$	221,704	$	(170,290	)	$	51,414	$	221,704	$	(163,257	)	$	58,447

Amortization expense for the identifiable purchased intangible assets for the three months ended March 29, 2013 and March 30, 2012 was allocated as follows (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Included in cost of revenue	$	4,945	$	5,360
Included in operating expenses		2,088		2,179
Total amortization expense	$	7,033	$	7,539

The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):

	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2013 (remaining 9 months)	$	14,288	$	6,008	$	20,296
2014		13,745		6,775		20,520
2105		719		5,783		6,502
2016		—		4,096		4,096
2017		—		—		—
Total future amortization expense	$	28,752	$	22,662	$	51,414

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Credit Facilities

3 Months Ended

Mar. 29, 2013

Debt Disclosure [Abstract]

Credit Facilities

NOTE 9: CREDIT FACILITIES

Harmonic has a bank line of credit facility with Silicon Valley Bank, which provides for borrowings of up to $10.0 million and matures on August 23, 2013. As of March 29, 2013, other than standby letters of credit and guarantees (Note 14), there were no amounts outstanding under the line of credit facility, and there were no borrowings during the three months ended March 29, 2013. This facility, which became effective in August 2011 and was amended in August 2012, contains a financial covenant that requires Harmonic to maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00. As of March 29, 2013, the Company’s ratio under that covenant was 4.97 to 1. In the event of noncompliance by Harmonic with the covenants under the facility, including the financial covenant referenced above, Silicon Valley Bank would be entitled to exercise its remedies under the facility, including declaring all obligations immediately due and payable. At March 29, 2013, Harmonic was in compliance with the covenants under the line of credit facility. Borrowings pursuant to the line would bear interest at the bank’s prime rate (3.25% at March 29, 2013) or at LIBOR for the desired borrowing period (an annualized rate of 0.20% for a one month borrowing period at March 29, 2013) plus 1.75%, or 1.95%. Borrowings are not collateralized.

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Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 29, 2013	Jun. 29, 2012 Patents	Oct. 31, 2011 Patents
Contingencies And Commitments [Line Items]
Future sublease income from Aurora	$ 600,000
Non-cancelable purchase commitments	19,700,000
Maximum amount of potential future payments under the company's financial guarantees	400,000
Infringements of number of patents held		1	2
Israel [Member]
Contingencies And Commitments [Line Items]
Guarantees which major related to rent	500,000
Aurora [Member]
Contingencies And Commitments [Line Items]
Non-cancelable purchase commitments	5,500,000
Indemnification [Member]
Contingencies And Commitments [Line Items]
Accrual for indemnification provisions	$ 0

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Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 4,292	$ 5,558
Transfer to Aurora as part of the sale of discontinued operations	(939)
Accrual for current period warranties	1,394	1,619
Warranty costs incurred	(1,477)	(2,044)
Balance at end of period	$ 3,270	$ 5,133

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Income (Loss) Per Share - Anti-dilutive Securities (Detail) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Earnings Per Share [Abstract]
Potentially dilutive equity awards outstanding	13,131	10,209

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 29, 2013

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under Non-cancelable Operating Leases

Future minimum lease payments under non-cancelable operating leases at March 29, 2013, after giving effect to $0.6 million of future sublease income from Aurora, are as follows (in thousands):

Years ending December 31,
2013 (remaining nine months)	$	7,616
2014		7,495
2015		7,042
2016		7,235
2017		7,360
Thereafter		20,398
Total	$	57,146

Summary of Warranty Accrual Included in Accrued Liabilities

Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):

	Three months ended
	March 29, 2013			March 30, 2012
Balance at beginning of period	$	4,292		$	5,558
Transfer to Aurora as part of the sale of discontinued operations		(939	)		—
Accrual for current period warranties		1,394			1,619
Warranty costs incurred		(1,477	)		(2,044	)
Balance at end of period	$	3,270		$	5,133

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Restructuring and Related Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013 Employees
Restructuring Cost and Reserve [Line Items]
Number of involuntary termination of employees	30
Restructuring accrual costs	$ 247
Restructuring charges	424
Restructuring charges in continued operations	565
Estimated leasehold improvements related restructuring	101
Operating expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	400
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accrual costs	247
Restructuring charges in continued operations	464
Estimated leasehold improvements related restructuring
Product cost of revenue [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	200
Product cost of revenue [Member] | Operating expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	600
Severance and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges in continued operations	464
HFC business [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges in discontinued operations	367
Number of involuntary termination of employees	9
Number of terminated employees required to work end of Aurora TSA Period	3
Restructuring accrual costs	165
HFC business [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges in discontinued operations	243
Restructuring accrual costs	165
HFC business [Member] | Contract termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges in discontinued operations	124
Restructuring accrual costs

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Commitments and Contingencies

3 Months Ended

Mar. 29, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 14: COMMITMENTS AND CONTINGENCIES

Leases

Future minimum lease payments under non-cancelable operating leases at March 29, 2013, after giving effect to $0.6 million of future sublease income from Aurora, are as follows (in thousands):

Years ending December 31,
2013 (remaining nine months)	$	7,616
2014		7,495
2015		7,042
2016		7,235
2017		7,360
Thereafter		20,398
Total	$	57,146

Warranties

The Company accrues for estimated warranty costs at the time of product shipment. Management periodically reviews the estimated fair value of its warranty liability and records adjustments based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims. Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):

	Three months ended
	March 29, 2013			March 30, 2012
Balance at beginning of period	$	4,292		$	5,558
Transfer to Aurora as part of the sale of discontinued operations		(939	)		—
Accrual for current period warranties		1,394			1,619
Warranty costs incurred		(1,477	)		(2,044	)
Balance at end of period	$	3,270		$	5,133

Purchase Commitments with Contract Manufacturers and Other Suppliers

The Company relies on a limited number of contract manufacturers and suppliers to provide manufacturing services for a substantial majority of its products. In addition, some components, sub-assemblies and modules are obtained from a sole supplier or limited group of suppliers. During the normal course of business, in order to reduce manufacturing lead times and ensure adequate component supply, the Company enters into agreements with certain contract manufacturers and suppliers that allow them to procure inventory based upon criteria as defined by the Company. The Company had approximately $19.7 million of non-cancelable purchase commitments with contract manufacturers and other suppliers as of March 29, 2013. This amount does not include $5.5 million of non-cancelable purchase commitments with contract manufacturers and other suppliers on Aurora’s behalf. In the event Aurora were to default on its obligations to reimburse the Company for inventory purchased on its behalf, the Company would continue to be obligated to the vendors from which it purchased the inventory and, accordingly, its operating results, financial condition and cash flow could be materially and adversely affected.

Standby Letters of Credit

As of March 29, 2013, the Company’s financial guarantees consisted of standby letters of credit outstanding, which were principally related to performance bonds and state requirements imposed on employers. The maximum amount of potential future payments under these arrangements was $0.4 million as of March 29, 2013.

Indemnification

Harmonic is obligated to indemnify its officers and the members of its Board of Directors pursuant to its bylaws and contractual indemnity agreements. Harmonic also indemnifies some of its suppliers and most of its customers for specified intellectual property matters pursuant to certain contractual arrangements, subject to certain limitations. The scope of these indemnities varies, but, in some instances, includes indemnification for damages and expenses (including reasonable attorneys’ fees). There have been no amounts accrued in respect of these indemnification provisions through March 29, 2013.

Guarantees

The Company has $0.5 million of guarantees in Israel, with the majority related to rent for buildings used by its Israeli subsidiaries, as of March 29, 2013.

Legal proceedings

In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages.

On November 14, 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent.

At this time, the Company cannot predict the outcome of the above matters.

An unfavorable outcome on the Avid matters or the FastVDO matter referenced above or any other litigation matter could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of such matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

Harmonic’s industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. From time to time, third parties have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or the Company’s customers. Such assertions arise in the normal course of the Company’s operations. The resolution of any such assertions and claims cannot be predicted with certainty.

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Short-Term Investments (Tables)

3 Months Ended

Mar. 29, 2013

Cash And Cash Equivalents [Abstract]

Summary of Short-Term Investments

The following table summarizes the Company’s short-term investments (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of March 29, 2013
Certificates of deposit	$	1,605	$	—	$	—		$	1,605
State, municipal and local government agencies bonds		59,137		56		(2	)		59,191
Corporate bonds		31,062		7		(22	)		31,047
Commercial paper		9,944		—		—			9,944
U.S. federal government bonds		8,003		1		(1	)		8,003
Total short-term investments	$	109,751	$	64	$	(25	)	$	109,790
As of December 31, 2012
Certificates of deposit	$	1,603	$	—	$	—		$	1,603
State, municipal and local government agencies bonds		59,009		45		(4	)		59,050
Corporate bonds		31,568		4		(10	)		31,562
Commercial paper		10,287		1		—			10,288
U.S. federal government bonds		2,003		—		—			2,003
Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506

Maturities of Short-Term Investments

The following table summarizes the maturities of the Company’s short-term investments (in thousands):

	March 29, 2013		December 31, 2012
Less than one year	$	84,402	$	76,779
Due in 1 - 2 years		25,388		27,727
Total short-term investments	$	109,790	$	104,506

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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
2013 (remaining 9 months)	$ 20,296
2014	20,520
2015	6,502
2016	4,096
2017
Total	51,414	58,447
Product cost of revenue [Member]
Finite-Lived Intangible Assets [Line Items]
2013 (remaining 9 months)	14,288
2014	13,745
2015	719
2016
2017
Total	28,752
Operating Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
2013 (remaining 9 months)	6,008
2014	6,775
2015	5,783
2016	4,096
2017
Total	$ 22,662

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Short-Term Investments - Summary of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 109,751	$ 104,470
Gross Unrealized Gains	64	50
Gross Unrealized Losses	(25)	(14)
Total short-term investments, Estimated Fair Value	109,790	104,506
Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	1,605	1,603
Gross Unrealized Gains
Gross Unrealized Losses
Total short-term investments, Estimated Fair Value	1,605	1,603
State, municipal and local government agencies bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	59,137	59,009
Gross Unrealized Gains	56	45
Gross Unrealized Losses	(2)	(4)
Total short-term investments, Estimated Fair Value	59,191	59,050
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	31,062	31,568
Gross Unrealized Gains	7	4
Gross Unrealized Losses	(22)	(10)
Total short-term investments, Estimated Fair Value	31,047	31,562
Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	9,944	10,287
Gross Unrealized Gains		1
Gross Unrealized Losses
Total short-term investments, Estimated Fair Value	9,944	10,288
U.S. federal government bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	8,003	2,003
Gross Unrealized Gains	1
Gross Unrealized Losses	(1)
Total short-term investments, Estimated Fair Value	$ 8,003	$ 2,003

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Income Statement [Abstract]
Gain on disposal of discontinued operations	$ 14,956

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Discontinued Operations

3 Months Ended

Mar. 29, 2013

Discontinued Operations And Disposal Groups [Abstract]

Discontinued Operations

NOTE 3: DISCONTINUED OPERATIONS

On February 18, 2013, the Company entered into an Asset Purchase Agreement with Aurora pursuant to which the Company agreed to sell its cable access HFC business for $46.0 million in cash. On March 5, 2013, the sale transaction closed and the Company received gross proceeds of $46.0 million from the sale and recorded a net gain of $15.0 million in connection with the sale.

In accordance with ASC 205 “Presentation of financial statements – Discontinued Operations”, a business is classified as a discontinued operation when : (i) the operations and cash flows of the business can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the business has either been disposed of or is classified as held for sale; and (iii) the Company will not have any significant continuing involvement in the operations of the business after the disposal transactions.

On March 5, 2013, the Company entered into a transition service agreement (‘TSA”) with Aurora to provide contract manufacturing for up to five months and other various support, including providing order fulfillment, taking warranty calls, attending to product returns from customers, providing cost accounting analysis, receiving payments from customers and remitting such payments to Aurora for up to two months. The TSA fees are a fixed amount per month and were determined based on the Company’s estimated cost of delivering the transition services. In addition, on April 24, 2013, the Company and Aurora signed a sublease agreement for the Company’s Milpitas warehouse for the remaining period of the lease. The Company determined that the cash flows generated from these transactions are both insignificant and are considered indirect cash flows. As a result, the sale of the cable access HFC business is appropriately presented as discontinued operations. The TSA billing to Aurora in the three months ended March 29, 2013 totaled $328,000, and it was recorded in the Consolidated Statements of Operations under income from continuing operations as an offset to the expenses incurred to deliver the transition services. The table below provides details on the income statement caption under which the TSA billing was recorded (in thousands):

	Three months ended
	March 29, 2013
Product cost of revenue	$	175
Research and development		9
Selling, general and administrative		144
Total TSA billing to Aurora	$	328

Included within the “Prepaid expenses and other current assets” ending balance at March 29, 2013 on the Consolidated Balance Sheet is $1.7 million due from Aurora for purchases made on Aurora’s behalf and $3.0 million in receivables from customers invoiced on Aurora’s behalf. Included within the “Accrued liabilities” ending balance at March 29, 2013 is $1.4 million payable to third party vendors for purchases made on Aurora’s behalf and $2.9 million due to Aurora primarily for invoicing to customers made on Aurora’s behalf.

The Company recorded a gain of $15.0 million in connection with the sale of the cable access HFC business, calculated as follows (in thousands):

Gross Proceeds				$	46,000
Less : carrying value of net assets
Inventories, net	$	10,487
Prepaid expenses and other current assets		612
Property and equipment, net		1,133
Goodwill de-recognized		14,547
Deferred revenue		(4,499	)
Accrued liabilities		(939	)
Total net assets sold and de-recognized				$	21,341
Less : selling cost				$	2,469
Less : Tax effect				$	7,234
Gain on disposal, net of tax				$	14,956

Since the Company has one reporting unit, upon the sale of the cable access HFC business, approximately $14.5 million of the carrying value of goodwill was allocated to the cable access HFC business based on the relative fair value of the cable access HFC business to the fair value of the Company. The remaining carrying value of goodwill as of March 29, 2013 was tested for impairment, and the Company determined that goodwill was not impaired as of March 29, 2013.

The results of operations associated with the cable access HFC business are presented as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. Revenue and the components of net income related to the discontinued operations for the three months ended March 29, 2013 and March 30, 2012 were as follows:

	Three months ended
	March 29, 2013			March 30, 2012
Revenue	$	9,556		$	11,282
Operating income	$	834		$	1,226
Less: (Benefit from) provision for income taxes		(134	)		19
Add: Gain on disposal, net of tax		14,956			—
Income from discontinued operations, net of taxes	$	15,924		$	1,207

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Stock-Based Compensation - Valuation Assumptions for Stock Options (Detail)	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	0.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	4 years 8 months 12 days	4 years 8 months 12 days
Volatility	52.00%	58.00%
Risk-free interest rate	0.80%	1.00%
Expected dividends	0.00%	0.00%

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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], Dutch Auction [Member], USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Apr. 22, 2013
Subsequent Event [Line Items]
Tender offer to purchase common stock	$ 100
Commencement date of tender offer	April 26, 2013
Expiry date of tender offer	May 24, 2013
Percentage of common shares outstanding	14.10%
Minimum [Member]
Subsequent Event [Line Items]
Sale of common stock price per share	$ 5.75
Maximum [Member]
Subsequent Event [Line Items]
Sale of common stock price per share	$ 6.25

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 29, 2013

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value as of March 29, 2013 and December 31, 2012, based on the three-tier fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3		Total
As of March 29, 2013
Cash equivalents
Money market funds	$	62,370	$	—	$	—	$	62,370
U.S. federal government bonds with maturity less than 90 days		2,002		—		—		2,002
Short-term investments
Certificates of deposit		—		1,605		—		1,605
State, municipal and local government agencies bonds		—		59,191		—		59,191
Corporate bonds		—		31,047		—		31,047
Commercial paper		—		9,944		—		9,944
U.S. federal government bonds		8,003		—		—		8,003
Prepaids and other current assets
Foreign exchange forward contracts		—		735		—		735
Total assets measured and recorded at fair value	$	72,375	$	102,522	$	—	$	174,897
Accrued liabilities
Foreign exchange forward contracts	$	—	$	63	$	—	$	63
Total liabilities measured and recorded at fair value	$	—	$	63	$	—	$	63
	Level 1		Level 2		Level 3		Total
As of December 31, 2012
Cash equivalents
Money market funds	$	54,923	$	—	$	—	$	54,923
Corporate bonds with maturity less than 90 days		—		3,614		—		3,614
U.S. federal government bonds with maturity less than 90 days		3,005		—		—		3,005
Short-term investments
Certificates of deposit		—		1,603		—		1,603
State, municipal and local government agencies bonds		—		59,050		—		59,050
Corporate bonds		—		31,562		—		31,562
Commercial paper		—		10,288		—		10,288
U.S. federal government bonds		2,003		—		—		2,003
Prepaids and other current assets
Foreign exchange forward contracts		—		344		—		344
Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
Accrued liabilities
Foreign exchange forward contracts	$	—	$	143	$	—	$	143
Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143

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Discontinued Operations - Schedule of Details on Income Statement Caption on TSA Billing (Detail) (Aurora [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total TSA billing to Aurora	$ 328
Product cost of revenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total TSA billing to Aurora	175
Research and development expense [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total TSA billing to Aurora	9
Selling, general and administrative expenses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total TSA billing to Aurora	$ 144

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Income (Loss) Per Share

3 Months Ended

Mar. 29, 2013

Earnings Per Share [Abstract]

Income (Loss) Per Share

NOTE 13: INCOME (LOSS) PER SHARE

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts):

	Three months ended
	March 29, 2013			March 30, 2012
Numerator:
Loss from continuing operations	$	(9,503	)	$	(8,735	)
Income from discontinued operations		15,924			1,207
Net income (loss)	$	6,421		$	(7,528	)
Denominator:
Basic and diluted weighted average number of shares outstanding		115,219			117,275
Basic and diluted net income (loss) per share from:
Continuing operations	$	(0.08	)	$	(0.07	)
Discontinued operations		0.14			0.01
Net Income (loss)	$	0.06		$	(0.06	)

The following table sets forth the potentially dilutive shares from stock options, restricted stock units and the ESPP, for the periods presented, that were excluded from the net income (loss) per share computations because their effect was anti-dilutive (in thousands):

	Three months ended
	March 29, 2013		March 30, 2012
Potentially dilutive equity awards outstanding		13,131		10,209