TMC Shares Plunge 28.2% in H1 2026 Amid Operational Wins
The Metals Company shares dropped 28.2% in the first half of 2026, even as the deep-sea miner secured key regulatory approvals and a major production partnership, highlighting the market's impatience with the sector's long commercialization timeline.
The Metals Company (NASDAQ: TMC) saw its stock decline 28.2% during the first six months of 2026, according to S&P Global Market Intelligence. This drop follows a massive 451% surge in 2025, marking a sharp reversal in investor sentiment toward the deep-sea mining firm.
The sell-off is notable because the company has not encountered any apparent operational or regulatory setbacks during the period. Instead, TMC has spent the first half of 2026 notching concrete milestones that bring commercial deep-sea mining closer to reality.
Last year's explosive rally was largely driven by policy shifts. In April 2025, President Trump issued executive orders aimed at boosting domestic critical mineral production, with a specific emphasis on deep-sea mining. Investors interpreted this as a potential bypass of the bureaucratic and environmental hurdles that had long stalled TMC's plans to extract copper, cobalt, nickel, and manganese from the ocean floor.
Rather than stalling, those regulatory processes have advanced this year. In May 2026, the National Oceanic and Atmospheric Administration (NOAA) determined that TMC's application for an exploration license and commercial recovery permit under the Deep Seabed Hard Mineral Resources Act was in full compliance with the law.
Before the month ended, NOAA further certified TMC's USA B exploration license application. The covered area spans roughly 122,000 square kilometers of seafloor and holds an estimated 1.02 billion metric tons of polymetallic nodules. These deposits contain high grades of nickel, cobalt, copper, and manganese, alongside several rare-earth elements.
On the operational front, TMC also signed an agreement with Allseas, a subsea construction and offshore pipeline specialist. The partnership covers the development, commissioning, and operation of a commercial nodule collection system designed to process 3 million wet metric tons annually.
For market professionals, the divergence between TMC's H1 2026 share price and its fundamental progress underscores the risks of trading on political catalysts in capital-intensive industries. While the 2025 executive orders provided a speculative boost, investors are now grappling with the reality that moving from regulatory compliance to actual mineral extraction and revenue generation remains a multi-year endeavor. The stock's decline suggests the market is currently discounting the time required to monetize these newly secured seabed assets.
