X0306 4 2020-02-13 0 0000949039 DIAMOND OFFSHORE DRILLING, INC. DO 0001600577 Edwards Marc Gerard Rex 15415 KATY FREEWAY SUITE 100 HOUSTON TX 77094 1 1 0 0 President and C.E.O. Common Stock 2020-02-13 4 A 0 220681 A 315015 D Common Stock 2020-02-13 4 F 0 53751 3.80 D 261264 D The reported shares of common stock represent shares issuable pursuant to performance stock units awarded on April 1, 2017 that vested on February 13, 2020 upon determination of the level of attainment of the performance goals following the performance period and the number of performance stock units eligible to vest. The shares of common stock are deliverable by the company to the reporting person within two and one-half months following the end of the performance period ended December 31, 2019. The shares were received for no consideration upon the satisfaction of performance criteria underlying the award of performance stock units. /s/ Terence W. Waldorf Attorney-in-Fact for Marc Edwards 2020-02-14