Transocean's stock experienced a significant pre-market plunge, dropping 5.52% as trading opened on Tuesday. The sharp decline came amid heightened regulatory scrutiny of the company's planned acquisition.

The price movement follows news that both Transocean and Valaris have received a second request for additional information from the U.S. Department of Justice regarding their proposed merger. This regulatory action, issued on May 4, 2026, represents an escalation in the antitrust review process and requires further submissions before the review can move forward.

The all-share deal, which values each Valaris share at 15.235 Transocean shares, now faces an extended timeline as the review clock is paused until both parties have substantially complied with the DOJ's request. This development introduces increased uncertainty about the merger's approval and closing schedule, likely contributing to the negative investor sentiment reflected in the pre-market sell-off.