X0306 4 2020-05-14 0 0000949039 DIAMOND OFFSHORE DRILLING, INC. DOFSQ 0001600577 Edwards Marc Gerard Rex 15415 KATY FREEWAY SUITE 100 HOUSTON TX 77094 1 1 0 0 President and C.E.O. Common Stock 2020-05-14 4 S 0 50000 0.2268 D 211264 D Common Stock 2020-05-15 4 S 0 211264 0.2128 D 0 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.211 to $0.22, inclusive. The reporting person undertakes to provide to Diamond Offshore Drilling, Inc., any security holder of Diamond Offshore Drilling, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4. /s/ Terence W. Waldorf Attorney-in-Fact for Marc Edwards 2020-05-18