LEIDOS HOLDINGS, INC.
UNAUDITED BACKLOG BY REPORTABLE SEGMENT
(in millions)

Backlog represents the estimated amount of future revenues to be recognized under negotiated contracts. Backlog value is based on management's estimates about volume of services, availability of customer funding and other factors, and excludes contracts that are under protest. Our estimate of backlog comprises both funded and negotiated unfunded backlog. Backlog estimates are subject to change and may be affected by several factors including modifications of contracts, non-exercise of options, foreign currency movements, etc.

Funded backlog for contracts with the U.S. government represents the value on contracts for which funding is appropriated less revenues previously recognized on these contracts. Funded backlog for contracts with non-U.S. government entities and commercial customers represents the estimated value on contracts, which may cover multiple future years, under which Leidos is obligated to perform, less revenue previously recognized on the contracts.

Negotiated unfunded backlog represents estimated amounts of revenue to be earned in the future from contracts for which funding has not been appropriated and unexercised priced contract options. Negotiated unfunded backlog does not include future potential task orders expected to be awarded under indefinite delivery/indefinite quantity ("IDIQ"), General Services Administration Schedule or other master agreement contract vehicles, with the exception of certain IDIQ contracts where task orders are not competitively awarded or separately priced but instead are used as a funding mechanism, and where there is a basis for estimating future revenues and funding on future task orders is anticipated.

The estimated value of backlog as of the dates presented was as follows: