The share price of Transocean Ltd. (NYSE:RIG) fell by 8.67% between September 18 and September 25, 2025, putting it among the Energy Stocks that Lost the Most This Week. Transocean Ltd. (RIG) Falls Following Public Offering Announcement Transocean Ltd. (NYSE:RIG) is a leading international provider of offshore contract drilling services for oil and gas wells. Transocean Ltd. (NYSE:RIG) fell after the company announced that it intends to offer and sell 125 million shares in an underwritten public offerin ...