X0306 4 2022-05-03 0 0000949039 DIAMOND OFFSHORE DRILLING, INC. DO 0001313071 Duster Benjamin 15415 KATY FREEWAY SUITE 100 HOUSTON TX 77094 1 0 0 0 Restricted Stock Units 2022-05-03 4 A 0 10135 0.00 A Common Stock 10135 10135 D Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units vest and become non-forfeitable with respect to 30% of the restricted stock units on May 3, 2023 and 70% of the restricted stock units on May 3, 2024. The vested shares of common stock will be delivered to the reporting person following the earliest to occur of (i) the fifth anniversary of the grant date, (ii) the reporting person's separation from service with the issuer and (iii) a change in control (as defined in the award agreement) of the issuer. /s/ Terence W. Waldorf Attorney-in-Fact for Benjamin Duster 2022-05-04