Exhibit 99.1

LifeLock Announces 2014 Third Quarter Results

Record quarterly revenue of $123.0 million, up 29% year-over-year

Q3 cumulative ending members of approximately 3.52 million, up 23% year-over-year

Q3 monthly average revenue per member of $11.22, up 7% year-over-year

TEMPE, AZ (October 29, 2014) – LifeLock, Inc. (NYSE: LOCK), an industry leader in identity theft protection, today announced financial results for the third quarter ended September 30, 2014.

Third Quarter 2014 Financial Highlights:

“LifeLock produced another strong set of results combining both growth and profitability in the third quarter,” said Todd Davis, LifeLock’s Chairman and CEO. “The launch of our new product portfolio was well received, as we were pleased with the initial enrollment in the new offerings. We believe that consumers are increasingly realizing the superior value and functionality provided by our offerings compared with those from the providers of legacy credit monitoring solutions.”

Please note that the results contained in this earnings release are preliminary, and the final numbers will be reflected in the Form 10-Q for the quarter ended September 30, 2014 that we will file with the Securities and Exchange Commission. The issue involves the accounting for share-based compensation, which we believe that we have been overestimating. At this point, we believe that the dollar amounts involved are approximately $8 million in total for the period beginning January 1, 2013 and ending June 30, 2014, although it may impact prior periods as well. The preliminary estimate from this adjustment has been reflected in our results contained in this earnings release. Accordingly, we have increased our GAAP net income for all periods involved, but this had no impact on our previously reported adjusted EBITDA, adjusted net income, and adjusted net income per share.

A reconciliation of GAAP to non-GAAP financial measures has been provided in the financial statement tables included in this press release. An explanation of these measures is also included below under the heading “Non-GAAP Financial Measures.”

Third Quarter 2014 & Recent Business Highlights:

Guidance:

As of October 29, 2014, we are initiating guidance for our fourth quarter of 2014 as well as updating our guidance for the full year 2014.

Conference Call Details:

About LifeLock

LifeLock, Inc. (NYSE:LOCK) is a leading provider of proactive identity theft protection services for consumers and risk management services for enterprises. LifeLock’s threat detection, proactive identity alerts, and comprehensive remediation services help provide peace of mind for consumers amid the growing threat of identity theft. Leveraging unique data, science and patented technology from ID Analytics, Inc., a wholly owned subsidiary, LifeLock offers identity theft protection that goes significantly beyond credit monitoring. As part of its commitment to help fight identity theft, LifeLock works to train law enforcement and partners with a variety of non-profit organizations to help consumers establish positive habits to combat this threat.

Forward-Looking Statements

This press release contains “forward-looking” statements, as that term is defined under the federal securities laws, including statements regarding the expansion of our product portfolio, and our expected total revenue, adjusted net income per diluted share, adjusted EBITDA, and free cash flow for the fourth quarter of 2014 and for fiscal year 2014. These forward-looking statements are based on our current assumptions, expectations, and beliefs and are subject to substantial risks, uncertainties, assumptions, and changes in circumstances that may cause our actual results, performance, or achievements to differ materially from those expressed or implied in any forward-looking statement.

The risks and uncertainties referred to above include, but are not limited to, risks associated with our ability to maintain profitability on an annual basis; our ability to protect our customers’ confidential information; our ability to maintain and enhance our brand recognition and reputation; the competitive nature of the industries in which we conduct our business; our ability to maintain access to data

sources; our ability to retain our existing customers and attract new customers; our ability to improve our services and develop and introduce new services with broad appeal; our ability to maintain existing and secure new relationships with strategic partners; the effects of laws, regulations, and enforcement; the outcome of any litigation or regulatory proceeding; our ability to protect our intellectual property and not infringe on the intellectual property of others; and other “Risk Factors” set forth in our most recent filings with the Securities and Exchange Commission (the “SEC”).

Further information on these and other factors that could affect our financial results and the forward-looking statements in this press release is included in the filings we make with the SEC from time to time, including our Form 10-K for the year ended December 31, 2013, particularly under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” Copies of these documents may be obtained by visiting our Investor Relations website at http://investor.lifelock.com/ or the SEC’s website at www.sec.gov.

We assume no obligation and do not intend to update these forward-looking statements, except as required by law.

Non-GAAP Financial Measures

Our reported results include certain non-GAAP financial measures, including adjusted net income, adjusted net income per diluted share, adjusted EBITDA, and free cash flow. We calculate adjusted net income as net income (loss) excluding amortization of acquired intangible assets, share-based compensation, income tax benefits and expenses resulting from changes in our deferred tax assets, and acquisition related expenses. Historically, in calculating adjusted net income, we also excluded changes in fair value of warrant liabilities and changes in fair value of embedded derivatives in the periods in which those items occurred. We do not currently have any warrant liabilities or embedded derivatives. Accordingly, we will only include those items of income and expense in our reconciliation of adjusted net income for period-over-period comparisons. We calculate adjusted net income per diluted share by dividing our adjusted net income by the weighted-average diluted shares outstanding. We calculate adjusted EBITDA as net income (loss) excluding depreciation and amortization, share-based compensation, interest expense, interest income, other income (expense), income tax (benefit) expense, and acquisition related expenses. Historically, in calculating adjusted EBITDA, we also excluded changes in fair value of warrant liabilities and changes in fair value of embedded derivatives in the periods in which those items occurred. We do not currently have any warrant liabilities or embedded derivatives. Accordingly, we will only include those items of income and expense in our reconciliation of adjusted EBITDA for period-over-period comparisons. We define free cash flow as net cash provided by (used in) operating activities less net cash used in investing activities for acquisitions of property and equipment.

We have included adjusted net income, adjusted net income per diluted share, and adjusted EBITDA in this press release because they are key measures used by us to understand and evaluate our core operating performance and trends, to prepare and approve our annual budget, and to develop short- and long-term operational plans. In particular, the exclusion of certain expenses in calculating adjusted

net income and adjusted EBITDA can provide a useful measure for period-to-period comparisons of our core business. Additionally, adjusted EBITDA is a key financial measure used in determining management’s incentive compensation.

We have included free cash flow in this press release because we believe it typically presents a more conservative measure of cash flow as purchases of property and equipment are necessary components of ongoing operations. We believe that this non-GAAP financial measure is useful in evaluating our business because free cash flow reflects the cash surplus available to fund the expansion of our business after payment of capital expenditures relating to the necessary components of ongoing operations. We also believe that the use of free cash flow provides consistency and comparability with our past financial performance, facilitates period-to-period comparisons of operations, and also facilitates comparisons with other companies, many of which use similar non-GAAP financial measures to supplement their GAAP results.

Although adjusted net income, adjusted EBITDA, and free cash flow are frequently used by investors in their evaluations of companies, these non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation or as a substitute for financial information presented in accordance with GAAP. Because of these limitations, these non-GAAP financial measures should be considered alongside other financial performance measures.

We have not reconciled adjusted net income per diluted share guidance to net income per diluted share guidance or adjusted EBITDA guidance to net income guidance because we do not provide guidance for share-based compensation expense, provision for income taxes, interest income, interest expense, change in fair value of warrant liabilities, change in fair value of embedded derivatives, other income and expenses, depreciation expense, amortization of intangible assets, acquisition expenses, or income tax (benefit) expense, which are reconciling items between net income (loss) and adjusted net income and net income (loss) and adjusted EBITDA. As items that impact net income (loss) are out of our control and/or cannot be reasonably predicted, we are unable to provide such guidance. Accordingly, reconciliation to net income (loss) is not available without unreasonable effort. For a reconciliation of historical non-GAAP financial measures to the nearest comparable GAAP measures, see the reconciliation tables included in this press release.

Media Contact:

Kelley Bonsall

Media@lifelock.com

415-767-7749

Investor Relations Contact:

Greg Kleiner

ICR for LifeLock

Investor.relations@lifelock.com

480-457-5000

LifeLock, Inc.

Condensed Consolidated Statements of Operations

(in thousands, except per share amounts)

(Unaudited)

The results above and the financial tables below have been revised to correct an overstatement of non-cash expense of approximately $8 million for the period January 1, 2013 through June 30, 2014 associated with stock-based compensation expense.

LifeLock, Inc.

Condensed Consolidated Balance Sheets

(in thousands)

(Unaudited)

LifeLock, Inc.

Condensed Consolidated Statements of Cash Flows

(in thousands)

(Unaudited)

Share-Based Compensation

(in thousands)

(Unaudited)

Key Financial and Operating Metrics

(in thousands except percentages and per member data)

(Unaudited)

Reconciliation of GAAP to Adjusted Results

(in thousands, except per share amounts)

(Unaudited)