HOUSTON, April 27, 2020 /PRNewswire/ — Diamond Offshore Drilling, Inc. (NYSE: DO) (“the Company”) today announced that the Company received notification from the staff of NYSE Regulation, Inc. (“NYSE Regulation”) that it has determined to commence proceedings to delist the Company’s shares of common stock. NYSE Regulation determined that the Company was no longer suitable for listing pursuant to Listed Company Manual Section 802.01D after the Company’s April 27, 2020 disclosure that it and select subsidiaries have filed voluntary petitions for reorganization under chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the Southern District of Texas.

The Company does not presently anticipate exercising its right to appeal NYSE Regulation’s delisting determination.

The Company expects that the Company’s common stock will be quoted on