Leidos uses and refers to organic revenue, non-GAAP operating income, non-GAAP operating margin, adjusted EBITDA, adjusted EBITDA margin, non-GAAP diluted EPS, non-GAAP free cash flow and non-GAAP free cash flow conversion, which are not measures of financial performance under generally accepted accounting principles in the U.S. and, accordingly, these measures should not be considered in isolation or as a substitute for the comparable GAAP measures and should be read in conjunction with Leidos's consolidated financial statements prepared in accordance with GAAP.

Management believes that these non-GAAP measures provide another representation of the results of operations and financial condition, including its ability to comply with financial covenants. These non-GAAP measures are frequently used by financial analysts covering Leidos and its peers. The computation of non-GAAP measures may not be comparable to similarly titled measures reported by other companies, thus limiting their use for comparability.

Organic revenues capture the revenue that is inherent in the underlying business excluding the impact of acquisitions and divestitures made within the prior year; it is computed as current revenues excluding revenues from acquisitions within the last 12 months and divestitures within the current and year-ago periods.

Non-GAAP operating income is computed by excluding the following discrete items from operating income:

• Acquisition, integration and restructuring costs – Represents acquisition, integration, lease termination, severance and retention costs and asset markdowns related to acquisitions and restructuring activities.
• Amortization of acquired intangible assets – Represents the amortization of the fair value of the acquired intangible assets.
• Gain on sale of intangible assets – Represents the gain on sale of intellectual property not used in operations.
• Asset impairment charges – Represents impairments of long-lived intangible assets, right-of-use assets, and other assets related to our facility rationalization effort.
• Goodwill impairment charges – Represents impairments of goodwill due to changes in actual performance against performance projected when the goodwill was acquired.

Non-GAAP operating margin is computed by dividing non-GAAP operating income by revenues.

Adjusted EBITDA is computed by excluding the following items from income before income taxes: (i) discrete items as identified above; (ii) interest expense; (iii) interest income; (iv) depreciation expense; and (v) amortization of internally developed intangible assets.

Adjusted EBITDA margin is computed by dividing adjusted EBITDA by revenues.

Non-GAAP net income is computed by excluding the discrete items listed under non-GAAP operating income and their related tax impacts.

Non-GAAP diluted EPS is computed by dividing net income attributable to Leidos common stockholders, adjusted for the discrete items as identified above and the related tax impacts, by the diluted weighted average number of common shares outstanding.

Non-GAAP free cash flow is computed by deducting expenditures for property, equipment and software from net cash provided by (used in) operating activities.

Non-GAAP free cash flow conversion is computed by dividing non-GAAP free cash flow by non-GAAP net income attributable to Leidos common stockholders; operating cash flow conversion is computed by dividing net cash provided by (used in) operating activities by net income attributable to Leidos shareholders.

LEIDOS HOLDINGS, INC.
UNAUDITED NON-GAAP FINANCIAL MEASURES [CONTINUED]
(in millions, except growth percentages)

The following table presents the reconciliation of revenues to organic revenues by reportable segment and total operations:

LEIDOS HOLDINGS, INC.