Exhibit 99.1 Oceaneering Reports First Quarter 2024 Results HOUSTON, April 24, 2024 – Oceaneering International, Inc. ("Oceaneering") (NYSE:OII) today reported net income of $15.1 million, or $0.15 per share, on revenue of $599 million for the three months ended March 31, 2024. Adjusted net income was $13.9 million, or $0.14 per share, reflecting the positive impact of $(2.2) million in foreign exchange gains, and the associated $0.8 million of tax effects, along with $0.2 million of expenses related to dis ...