Company:  POWER ONE INC
Form Type:  10-K
Filing Date:  3/1/2012 
CIK:  0001042825 
Address:  740 CALLE PLANO 
City, State, Zip:  CAMARILLO, California 93012 
Telephone:  (805) 987-8741 
Fiscal Year:  12/30 
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  FORM 10-K
    PART I
      ITEM 1-BUSINESS
        NAME AND TITLE
      ITEM 1A-RISK FACTORS
      ITEM 1B-UNRESOLVED STAFF COMMENTS
      ITEM 2-PROPERTIES
      ITEM 3-LEGAL PROCEEDINGS
      ITEM 4-MINE SAFETY DISCLOSURES
    PART II
      ITEM 5-MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED ...
      ITEM 6-SELECTED FINANCIAL DATA
      ITEM 7-MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL ...
        Results of Operations
        Liquidity and Capital Resources
      ITEM 7A-QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT ...
      ITEM 8-FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
      ITEM 9-CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ...
      ITEM 9A-CONTROLS AND PROCEDURES
      ITEM 9B-OTHER INFORMATION
    PART III
      ITEM 10-DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
      ITEM 11-EXECUTIVE COMPENSATION
      ITEM 12-SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND ...
      ITEM 13-CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND ...
      ITEM 14-PRINCIPAL ACCOUNTING FEES AND SERVICES
    PART IV
      ITEM 15-EXHIBITS, FINANCIAL STATEMENT SCHEDULES
    (a)(1) FINANCIAL STATEMENTS
    VALUATION AND QUALIFYING ACCOUNTS
    SIGNATURES
    REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
    INCOME STATEMENT
    BALANCE SHEET
    INCOME STATEMENT
    STOCKHOLDERS EQUITY
    CASH FLOW
    INDEX TO EXHIBITS
  EXHIBIT 21
    SUBSIDIARIES
  EXHIBIT 23
    CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
  EXHIBIT 31.1
    CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO
  EXHIBIT 31.2
    CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO
  EXHIBIT 32
    CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER AND
BROKERAGE PARTNERS