Leidos (LDOS)

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On October 1, 2026, the Board of Directors (the " Board ") of Leidos Holdings, Inc. (the " Company ") increased the size of the Board to 11 members and elected Jeffery S. McElfresh as a Director of the Company, effective October 1, 2026 (the " Effective Date "). A copy of the press release announcing Mr. McElfresh s election is attached to this report as Exhibit 99.1. The Board has determined that Mr. McElfresh is independent and meets the applicable independence requirements of the New York Stock Exchange. Mr. McElfresh will receive compensation for his service as a non-employee member of the Board in accordance with the standard compensatory arrangements for non-employee members of the Board as described in the Company s proxy statement filed on March 19, 2026. Mr. McElfresh has been appointed to serve on the Board's Corporate Governance and Ethics and Technology and Information Security Committees, effective at the Effective Date. There are no arrangements or understandings between Mr. McElfresh and any other person pursuant to which Mr. McElfresh was selected as a director, and there are no transactions in which the Company is a party and in which Mr. McElfresh has a material interest subject to disclosure under Item 404(a) of Regulation S-K.

Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit 99.1 Press Release dated October 1, 2026, issued by Leidos Holdings, Inc. Exhibit 104 The cover page from this Current Report on Form 8-K, formatted in Inline XBRL and contained in Exhibit 101. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. LEIDOS HOLDINGS, INC. Date: October 1, 2026 By: /s/ Henrique B. Canarim Henrique B. Canarim Its: Corporate Secretary