TMC Stock Drops as NOAA Opens Public Comment on Deep-Sea Mining Exploration Licenses — What Investors Are Watching on Dec. 23, 2025
TMC the metals company Inc. (NASDAQ: TMC) is having another one of its “this is definitely not a sleepy stock” days. Shares of TMC fell sharply in Tuesday trading (Dec. 23, 2025), even as a major regulatory milestone landed on the U.S. government’s public agenda: NOAA is set to publish a Federal Register notice acknowledging receipt of amended exploration license applications from TMC’s U.S. subsidiary and announcing a public comment period and virtual public hearings in January 2026. Federal Register Public Inspection For investors, it’s a familiar mix: big regulatory headlines, big price swings, and a company whose valuation is