Forward Guidance

As a result of the Company's year-to-date performance and updated expectations, the Company is updating its fiscal year 2017 guidance as follows:

• Revenues of $10.1 billion to $10.4 billion, no change from prior guidance;
• Adjusted EBITDA margins of 10.2% to 10.4% versus the prior range of 9.8% to 10.2%;
• Non-GAAP diluted earnings per share from continuing operations of $3.60 to $3.75, up from the previous range of $3.45 to $3.60; and
• Cash flows provided by operating activities from continuing operations at or above $490 million, up from previous guidance at or above $475 million.

Non-GAAP diluted earnings per share excludes amortization of acquired intangible assets, asset impairment charges, restructuring expenses, acquisition and integration costs, amortization of equity method investments, gains and losses on sale of assets and businesses and adjustments to the income tax provision to reflect non-GAAP exclusions. See Leidos' non-GAAP financial measures and the related reconciliation included elsewhere in this release.

The Company does not provide a reconciliation of forward-looking adjusted EBITDA margins (non-GAAP) or non-GAAP diluted earnings per share from continuing operations to GAAP net income (loss), due to the inherent difficulty in forecasting and quantifying certain amounts that are necessary for such reconciliation. Because certain deductions for non-GAAP exclusions used to calculate projected net income (loss) may vary significantly based on actual events, the Company is not able to forecast on a GAAP basis with reasonable certainty all deductions needed in order to provide a GAAP calculation of projected net income (loss) at this time. The amounts of these deductions may be material and, therefore, could result in projected GAAP net income (loss) and diluted earnings per share from continuing operations being materially less than projected adjusted EBITDA margins (non-GAAP) and non-GAAP diluted earnings per share from continuing operations.

Conference Call Information

Leidos management will discuss operations and financial results in an earnings conference call beginning at 7:30 A.M. eastern time on November 2, 2017. Analysts and institutional investors may participate by dialing +1 (877) 869-3847 (U.S. dial-in) or +1 (201) 689-8261 (international dial-in).

A live audio broadcast of the conference call along with a supplemental presentation will be available to the public through links on the Leidos Investor Relations website ( http://ir.leidos.com).

After the call concludes, an audio replay can be accessed on the Leidos Investor Relations website or by dialing +1 (877) 660-6853 (toll-free U.S.) or +1 (201) 612-7415 (international) and entering conference ID 13671145.

About Leidos

Leidos is a FORTUNE 500^® science and technology solutions and services leader working to solve the world's toughest challenges in the defense, intelligence, homeland security, civil and health markets. The company's 32,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Virginia, Leidos reported annual revenues of approximately $7.04 billion for the fiscal year ended December 30, 2016.

For more information, visit www.leidos.com.

Forward-Looking Statements

Certain statements in this release contain or are based on "forward-looking" information within the meaning of the Private Securities Litigation Reform Act of 1995. In some cases, you can identify forward-looking statements by words such as "expects," "intends," "plans," "anticipates," "believes," "estimates," "guidance" and similar words or phrases. Forward-looking statements in this release include, among others, estimates of future revenues, EBITDA margins (including on a non-GAAP basis), operating income, earnings, earnings per share (including on a non-GAAP basis), charges, backlog, bookings, contract values, outstanding shares and cash flows, as well as statements about future dividends, share repurchases, acquisitions and dispositions. These statements reflect our belief and assumptions as to future events that may not prove to be accurate.

Actual performance and results may differ materially from the guidance and other forward-looking statements made in this release depending on a variety of factors, including: changes to our reputation and relationships with government agencies, developments in the U.S. Government defense budget, including budget reductions, implementation of spending cuts (sequestration) or changes in budgetary priorities; delays in the U.S. Government budget process; delays in the U.S. Government contract procurement process or the award of contracts; delays or loss of contracts as a result of competitor protests; changes in U.S. Government procurement rules, regulations and practices; changes in interest rates and other market factors out of our control; our compliance with various U.S. Government and other government procurement rules and regulations; governmental reviews, audits and investigations of our Company; our ability to effectively compete for and win contracts with the U.S. Government and other customers; our ability to attract, train and retain skilled employees, including our management team, and to obtain security clearances for our employees; factors relating to the transaction with Lockheed Martin, including, tax treatment; the possibility that we may be unable to achieve expected synergies and operating efficiencies within the expected time-frames or at all, the integration of the acquired Information Systems & Global Solutions business being more difficult, time-consuming or costly than expected; the effect of any changes resulting from the transaction in customer, supplier and other business relationships; general market perception of the transaction and exposure to lawsuits and contingencies associated with the Information Systems & Global Solutions business; the mix of our contracts and our ability to accurately estimate costs associated with our firm-fixed-price and other contracts; our ability to realize as revenues the full amount of our backlog; cybersecurity, data security or other security threats, systems failures or other disruptions of our business; resolution of legal and other disputes with our customers and others or legal or regulatory compliance issues; our ability to effectively acquire businesses and make investments; our ability to maintain relationships with prime contractors, subcontractors and joint venture partners; our ability to manage performance and other risks related to customer contracts, including complex engineering projects; the failure of our inspection or detection systems to detect threats; the adequacy of our insurance programs designed to protect us from significant product or other liability claims; our ability to manage risks associated with our international business; our ability to declare future dividends based on our earnings, financial condition, capital requirements and other factors, including compliance with applicable laws and contractual agreements; and our ability to execute our business plan and long-term management initiatives effectively and to overcome these and other known and unknown risks that we face. These are only some of the factors that may affect the forward-looking statements contained in this release. For further information concerning risks and uncertainties associated with our business, please refer to the filings we make from time to time with the U.S. Securities and Exchange Commission ("SEC"), including the "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Legal Proceedings" sections of our latest Annual Report on Form 10-K and quarterly reports on Form 10-Q, all of which may be viewed or obtained through the Investor Relations section of our website at www.leidos.com.

All information in this release is as of November 2, 2017. The Company expressly disclaims any duty to update the guidance or any other forward-looking statement provided in this release to reflect subsequent events, actual results or changes in the Company's expectations. The Company also disclaims any duty to comment upon or correct information that may be contained in reports published by investment analysts or others.