Exhibit 99.1

LifeLock Announces 2013 Fourth Quarter and Year-End Results

Record quarterly revenue of $102.3 million, up 30% year-over-year

Q4 cumulative ending members of approximately 3.0 million, up 21% year-over-year

Q4 monthly average revenue per member of $10.72, up 11% year-over-year

TEMPE, AZ (February 19, 2014) – LifeLock, Inc. (NYSE: LOCK), an industry leader in identity theft protection, today announced financial results for the fourth quarter and fiscal year ended December 31, 2013.

Fourth Quarter 2013 Financial Highlights:

“We closed out 2013 on a strong note, posting solid results on both the top and bottom line,” said Todd Davis, LifeLock’s Chairman and CEO. “The combination of our leading brand and unique technology continue to drive our results. Our ongoing business momentum, along with the launch of the LifeLock Wallet mobile application, positions LifeLock well as we begin 2014. We are proud to help over 3 million consumers live freely in a connected world.”

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.”

Fourth Quarter 2013 & Recent Business Highlights:

Fiscal Year 2013 Financial Highlights:

Guidance:

As of February 19, 2014, we are initiating guidance for our first quarter of 2014 as well as 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 fraud and risk solutions for enterprises. LifeLock’s threat detection, proactive identity alerts, and comprehensive remediation services provide peace of mind for consumers amid the growing threat of identity theft. The LifeLock mobile app helps consumers manage their identity and payment cards on the go and enables LifeLock members to receive alerts and services on their digital device. 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 our leading brand and unique technology, the launch of the LifeLock Wallet mobile application, our position heading into 2014, our outlook for 2014, and our expected total revenue, adjusted net income per share, adjusted EBITDA, and free cash flow for the first 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, 2012, 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 share, adjusted EBITDA, and free cash flow. We define adjusted net income as net income (loss) excluding amortization of acquired intangible assets, change in fair value of warrant liabilities, change in fair value of embedded derivatives, share-based compensation, acquisition related expenses, and income tax benefits and expenses resulting from changes in our deferred tax assets. We define adjusted net income per share as adjusted net income per share of stock assuming all preferred stock converted into common stock at the later of the start of the period or the date of issuance and excluding the impact of warrants to purchase Series E and Series E-2 preferred stock. We define adjusted EBITDA as net income (loss) excluding depreciation and amortization, interest expense, interest income, change in fair value of warrant liabilities, change in fair value of embedded derivative, other income (expense), income taxes, acquisition related expenses, and share-based compensation. 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 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.

In the fourth quarter of 2013, we modified our calculation of adjusted EBITDA and adjusted net income to also exclude acquisition related expense. For comparative purposes, we also modified our calculation of adjusted our adjusted EBITDA and adjusted net income for 2012 to exclude the acquisition related expenses incurred during our acquisition of ID Analytics.

We have included free cash flow in this press release because 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 share guidance to net income per 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)

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)