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| FORM 10-K/AAmendment No. 1 |

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

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

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| LifeLock, Inc.(Exact name of registrant as specified in its charter) |

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|                                                               |  |  |
| Delaware                                                      |   | 56-2508977 |
| (State or other jurisdiction ofincorporation or organization) |   | (I.R.S. EmployerIdentification No.) |

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| 60 East Rio Salado Parkway, Suite 400Tempe, Arizona 85281(Address of principal executive offices and zip code)(480) 682-5100(Registrant’s telephone number, including area code) |
| Securities registered pursuant to Section 12(b) of the Act:                                                                                                                       |

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| Title of Each Class            |   | Name of Each Exchange on Which Registered |
| Common Stock, $0.001 par value |   | The New York Stock Exchange |

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| Securities registered pursuant to Section 12(g) of the Act:None |

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

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| DOCUMENTS INCORPORATED BY REFERENCE: |

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| ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES |

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| (a) | Documents filed as a part of this Amendment: |

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| 1. | Financial Statements: |

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| • | Financial Statements and Supplementary Data |

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| • | Consolidated Balance Sheets as of December 31, 2014 and 2013 |

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| • | Consolidated Statements of Operations for the fiscal years ended December 31, 2014, 2013, and 2012 |

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| • | Consolidated Statements of Comprehensive Income for the fiscal years ended December 31, 2014, 2013, and 2012 |

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| • | Consolidated Statements of Convertible Redeemable Preferred Stock and Stockholders' Equity (Deficit) for the fiscal years ended December 31, 2014, 2013, and 2012 |

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| • | Consolidated Statements of Cash Flows for the fiscal years ended December 31, 2014, 2013, and 2012 |

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| • |  Notes to the Consolidated Financial Statements |

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| 2. | Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts was previously filed with the SEC on February 20, 2015 as part of our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, which is being hereby amended.  All other schedules have been omitted because the required information is included in the consolidated financial statements or the notes thereto, or is not applicable or required. |

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| 3. | Exhibits: See Item 15(b) below. We have filed, or incorporated into this Annual Report on Form 10-K/A by reference, the exhibits listed on the accompanying Index to Exhibits immediately following the signature page of this Form 10-K/A. |

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| (b) | Exhibits: The exhibit list in the Index to Exhibits immediately following the signature page of this Annual Report on Form 10-K/A is incorporated herein by reference as the list of exhibits required by this Item 15(b). |

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| (c) | Financial Statement Schedules: See Item 15(a) above. |

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|   |   | LIFELOCK, INC. |
| Dated: | February 20, 2015 |  By: |   |  /s/ Todd Davis |
|   |   |   |   | Todd Davis |
|   |   |   |   | Chairman and Chief Executive Officer |

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| Exhibit No.         | Description of Exhibit  |
| 2.1                      | Agreement and Plan of Merger, dated as of December 11, 2013, by and among LifeLock, Inc., Lavender Acquisition Corporation, Lemon, Inc., and Shareholder Representative Services LLC, as the Securityholder Representative (1) |
|                     |   |
| 3.1                      | Seventh Amended and Restated Certificate of Incorporation of LifeLock, Inc. (2) |
|                     |   |
| 3.2                      | Amended and Restated Bylaws of LifeLock, Inc. (3) |
|                     |   |
| 4.1                      | Form of Common Stock Certificate (4) |
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| 4.2                      | Fourth Amended and Restated Investors’ Rights Agreement, dated as of March 14, 2012, by and among LifeLock, Inc. and the investors named therein (5) |
|                     |   |
| 10.1†              | Form of Indemnification Agreement by and between LifeLock, Inc. and each of its directors and executive officers (6) |
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| 10.2†              | Second Amended and Restated Employment Agreement, dated as of September 14, 2012, between LifeLock, Inc. and Todd Davis (7) |
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| 10.3†              | Second Amended and Restated Employment Agreement, dated as of September 14, 2012, between LifeLock, Inc. and Chris Power (8) |
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| 10.3A†             | First Amendment to Second Amended and Restated Employment Agreement, dated as of February 15, 2013, between LifeLock, Inc. and Chris Power (9) |
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| 10.4†              | Second Amended and Restated Employment Agreement, dated as of September 14, 2012, between LifeLock, Inc. and Clarissa Cerda (10) |
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| 10.7                     | Credit Agreement, dated as of January 9, 2013, among LifeLock, Inc., the Guarantors named therein, Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer, Silicon Valley Bank, as Syndication Agent, the other Lenders named therein, and Merrill Lynch, Pierce, Fenner & Smith Incorporated as Sole Lead Arranger and Sole Book Manager (11) |
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| 10.8                     | Office Lease, dated as of May 18, 2007, between LifeLock, Inc. and Hayden Ferry Lakeside, LLC (12) |
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| 10.8A                    | First Amendment to Office Lease, dated as of March 7, 2008, between LifeLock, Inc. and Hayden Ferry Lakeside, LLC (13) |
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| 10.8B                    | Second Amendment to Office Lease, dated as of May 17, 2013, between LifeLock, Inc. and PKY Fund II Phoenix II, LLC (14) |
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| 10.8C                    | Third Amendment to Office Lease, dated effective as of September 13, 2013, between LifeLock, Inc. and PKY Fund II Phoenix II, LLC (15) |
|                     |   |
| 10.8D                    | Fourth Amendment to Office Lease, dated effective as of December 5, 2013, between LifeLock, Inc. and PKY Fund II Phoenix II, LLC (16) |
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| 10.9                     | Lease Agreement, dated as of March 1, 2008, by and between LifeLock, Inc. and BoMin2035M LLC (17) |
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| 10.9A                    | First Amendment to Lease Agreement, dated as of March 17, 2008, by and between LifeLock, Inc. and BoMin2035M LLC (18) |
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| 10.9B                    | Second Amendment to Lease Agreement, dated as of May 14, 2010, by and between LifeLock, Inc. and BoMin2035M LLC (19) |
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| 10.10*                   | Identity Protection Service Provider Agreement, dated as of July 29, 2011, by and between LifeLock, Inc. and Early Warning Services, LLC (20) |
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| 10.10A*                  | Fourth Amendment to Identity Protection Service Provider Agreement, dated as of July 3, 2014, by and between LifeLock, Inc. and Early Warning Services, LLC (21) |
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| 10.11A*                  | Technology Services Agreement, dated as of January 16, 2014, by and between LifeLock, Inc. and CSIdentity Corporation (22) |
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| 10.11B**  †† | First Amendment to Technology Services Agreement, dated November 19, 2014, between LifeLock, Inc. and CSIdentity Corporation |
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| 10.12†             | Amended and Restated 2006 Incentive Compensation Plan (23) |
|                     |   |

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| Exhibit No.          | Description of Exhibit  |
| 10.13†              | Form of Stock Option Agreement under Amended and Restated 2006 Incentive Compensation Plan (24) |
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| 10.15†              | Employment Agreement, dated as of September 14, 2012, between LifeLock, Inc. and Hilary A. Schneider (25) |
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| 10.16†              | 2012 Incentive Compensation Plan (26) |
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| 10.17†              | Form of Stock Option Agreement and Restricted Stock Unit Agreement under 2012 Incentive Compensation Plan (27) |
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| 10.18†              | 2012 Employee Stock Purchase Plan (28) |
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| 10.19†              | 2012 Performance Bonus Plan (29) |
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| 10.21†              | Severance Agreement, dated as of July 22, 2013, by and between LifeLock, Inc. and Don Beck |
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| 10.22†              | 2015 Sales Commission Plan Agreement, dated February 17, 2015, by and between LifeLock, Inc. and Don Beck |
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| 21.1††        | List of Subsidiaries |
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| 23.1††        | Consent of Ernst & Young LLP, independent registered public accounting firm |
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| 24.1††        | Power of Attorney (included on the signature page of this Annual Report on Form 10-K) |
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| 31.1                      | Certification of Chief Executive Officer required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |
|                      |   |
| 31.2                      | Certification of Chief Financial Officer required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |
|                      |   |
| 32.1††† | Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |
|                      |   |
| 32.2††† | Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |
|                      |   |
| 101.INS††     | XBRL Instance Document |
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| 101.SCH††     | XBRL Taxonomy Extension Schema Document |
|                      |   |
| 101.CAL††     | XBRL Taxonomy Extension Calculation Linkbase Document |
|                      |   |
| 101.DEF††     | XBRL Taxonomy Extension Definition Linkbase Document |
|                      |   |
| 101.LAB††     | XBRL Taxonomy Extension Label Linkbase Document |
|                      |   |
| 101.PRE††     | XBRL Taxonomy Extension Presentation Linkbase Document |

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| (1) | Filed as Exhibit 2.1 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on December 12, 2013, and incorporated herein by reference. |

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| (2) | Filed as Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on October 9, 2012, and incorporated herein by reference. |

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| (3) | Filed as Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on October 9, 2012, and incorporated herein by reference. |

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| (4) | Filed as Exhibit 4.1 to Amendment No. 2 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 19, 2012, and incorporated herein by reference. |

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| (5) | Filed as Exhibit 4.2 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (6) | Filed as Exhibit 10.1 to Amendment No. 2 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 19, 2012, and incorporated herein by reference. |

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| (7) | Filed as Exhibit 10.2 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (8) | Filed as Exhibit 10.3 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (9) | Filed as Exhibit 10.3A to the Registrant’s Current Report on Form 8-K filed within the Securities and Exchange Commission on February 22, 2013, and incorporated herein by reference. |

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| (10) | Filed as Exhibit 10.4 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference.Filed as Exhibit 10.7 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on January 15, 2013, and incorporated herein by reference. |

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| (11) | Filed as Exhibit 10.7 to the Registrant’s Registration Statement on Form 8-K filed with the Securities and Exchange Commission on January 15, 2013, and incorporated herein by reference. |

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| (12) | Filed as Exhibit 10.8 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (13) | Filed as Exhibit 10.8A to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (14) | Filed as Exhibit 10.8B to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 21, 2013, and incorporated herein by reference. |

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| (15) | Filed as Exhibit 10.8C to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 16, 2013, and incorporated herein by reference. |

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| (16) | Filed as Exhibit 10.8D to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on December 10, 2013, and incorporated herein by reference. |

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| (17) | Filed as Exhibit 10.9 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (18) | Filed as Exhibit 10.9A to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (19) | Filed as Exhibit 10.9B to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (20) | Filed as Exhibit 10.10 to Amendment No. 3 the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 27, 2012, and incorporated herein by reference. |

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| (21) | Filed as Exhibit 10.10A to the Registrant’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 10, 2014, and incorporated herein by reference. |

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| (22) | Filed as Exhibit 10.11A to the Registrant’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 2, 2014, and incorporated herein by reference. |

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| (23) | Filed as Exhibit 10.12 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (24) | Filed as Exhibit 10.13 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on August 28, 2012, and incorporated herein by reference. |

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| (25) | Filed as Exhibit 10.15 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (26) | Filed as Exhibit 10.16 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (27) | Filed as Exhibit 10.17 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (28) | Filed as Exhibit 10.18 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| (29) | Filed as Exhibit 10.19 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 14, 2012, and incorporated herein by reference. |

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| † | Indicates management contract or compensatory plan or arrangement. |

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| †† | Previously filed with our Annual Report on Form 10-K filed with the SEC on February 20, 2015. |

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| ††† | Previously furnished with our Annual Report on Form 10-K filed with the SEC on February 20, 2015. |

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| * | Confidential treatment has been granted by the SEC for portions of this exhibit. |

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| ** | Certain information in this exhibit has been omitted and filed separately with the Securities and Exchange Commission.  Confidential treatment has been requested with respect to the omitted portions. |