X0306 4 2021-03-15 0 0001069258 KRATOS DEFENSE & SECURITY SOLUTIONS, INC. KTOS 0001080997 MILLS THOMAS E IV 10680 TREENA STREET, SUITE 600 SAN DIEGO CA 92131 0 1 0 0 President, C5ISR Div. Common Stock 2021-03-15 4 F 0 11135 25.09 D 40857 D Shares withheld in a net transaction to satisfy the minimum tax liability, in accordance with Issuer's trading policies, in connection with shares vested March 4, 2021 from performance restricted stock units granted in 2018 as reported on a Form 4 filed March 8, 2021 and released March 15, 2021. Includes approximately 9,388 shares held through Issuer's 401(k) Plan. Thomas E. Mills, by Eva Yee, Attorney-In-Fact 2021-03-17