Leidos — May 6, 2025 release

The transaction is expected to be completed in the second quarter of 2025, subject to the satisfaction or waiver of customary closing conditions. As of April 4, 2025, Leidos had $842 million in cash and cash equivalents and $5.1 billion of debt. On May 2, 2025, the Leidos Board of Directors declared a cash dividend of $0.40 per share. The dividend will be payable on June 30, 2025, to stockholders of record at the close of business on June 16, 2025. Leidos Holdings, Inc. Exhibit 99.1 2 NEW BUSINESS AWARDS Effective for the first quarter of fiscal 2025, Leidos changed its backlog policy to include estimated future revenue on task orders expected to be awarded under sole source indefinite delivery/indefinite quantity (IDIQ) contracts. Under the new policy, backlog at the end of the quarter was $46.3 billion, of which $7.3 billion was funded. Net bookings totaled $2.1 billion in the quarter, representing a book-to-bill ratio of 0.5. The impact of the new policy on the book-to-bill ratio in the quarter is immaterial. Included in the quarterly bookings were several notable awards: u Defense Threat Reduction Agency (DTRA) Integrated Information Technology Support Services. Leidos was awarded a new five-year task order with a ceiling value of $205 million to modernize and operate enterprise IT services for DTRA. Under the contract, Leidos will leverage experienced personnel, proven processes, and targeted innovation to enable DTRA to improve user experience, enhance Zero Trust cybersecurity compliance, increase operat