EXHIBIT 99.1 Leidos Holdings, Inc. Reports First Quarter Fiscal Year 2024 Results • Revenues of $4.0 billion, up 7% year-over-year • Net income of $283 million or $2.07 per diluted share • Adjusted EBITDA (non-GAAP) of $490 million (12.3% margin) • Non-GAAP Diluted Earnings per Share of $2.29, up 56% year-over-year • Cash Flows from Operations of $63 million; Free Cash Flow (non-GAAP) of $46 million • Net Bookings of $3.7 billion (book-to-bill ratio of 0.9 for the quarter and 1.1 for trailing twelve months) ...