144 0001820381 XXXXXXXX LIVE 0001336920 Leidos Holdings, Inc. 001-33072 1750 PRESIDENTS STREET RESTON VA 20190 571-526-6000 Porter Elizabeth A Officer President, Health and Civil Sector Common Stock Citigroup Global Markets, Inc.

390 Greenwich Street New York NY 10013

3000 544080.00 127855172 12/19/2025 NYSE Common Stock 12/19/2025 Vested Shares Account Leidos Holdings, Inc. N 3000 12/19/2025 Services Rendered Y Under securities to be sold, the date acquired and date of payments are various. 12/19/2025 09/12/2025 Conformed Signature on File