TMC Announces Appointment of Liam Mallon, Former President of ExxonMobil Upstream, to its Board of Directors

* Liam Mallon, former President of ExxonMobil Upstream Company, brings over 40 years of global energy and offshore operating experience, including leadership of ExxonMobil’s worldwide upstream business * Mallon oversaw $20–30 billion in annual capital deployment and major U.S. shale and offshore deepwater growth initiatives, including ExxonMobil’s landmark Guyana development and $60 billion Pioneer Natural Resources acquisition * His appointment strengthens TMC’s Board at a pivotal stage as the Company prepares to launch the world’s first commercial-scale deep seabed mineral operations to advance U.S. mineral independence NEW YORK, Sept. 29, 2026 (GLOBE NEWSWIRE) -- TMC the metals company Inc. (Nasdaq: TMC) (“TMC”, “The Metals Company” or the “Company”), a leading developer of the world’s largest resource of critical metals essential to energy, defense, manufacturing, and infrastructure, today announced Liam Mallon’s appointment to its Board of Directors as it advances plans for commercial recovery of polymetallic nodules in international waters under the U.S. Deep Seabed Hard Mineral Resources Act of 1980 and its implementing regulations administered by the National Oceanic and Atmospheric Administration (“NOAA”).