Exhibit 99.1

TMC Provides Second Quarter 2026 Corporate Update

NEW YORK, August 13, 2026 — TMC the metals company Inc. (Nasdaq: TMC) (“TMC” or “the Company”), a leading developer of the world’s largest resource of critical metals essential to energy, defense, manufacturing and infrastructure, today provided a corporate update and second quarter financial results for the period ended June 30, 2026.

Q2 2026 Financial Highlights

U.S. Government Funding Update

TMC USA’s Applications Continue Progressing Through NOAA Review

Strategic Partnerships Progress Key Offshore and Onshore Developments

U.S. Reaffirms Its Right to Exercise High Seas Freedoms as ITLOS Protects NORI and TOML’s Due Process Rights

ISA Approves NORI’s Exploration Contract Extension

Gerard Barron, Chairman & CEO of TMC, commented: “The regulatory picture is becoming clearer as our applications continue to progress through NOAA’s review process. There has been a delay of a few months in the USA-A consolidated application certification process, but we remain confident that the permit will arrive well in advance of offshore vessel commissioning by the end of 2027, which we believe remains the critical path for production start. The rigor of NOAA’s review is ultimately helpful for the permit’s legal defensibility in the coming decades.

The United States has strongly reiterated through its engagement at the ISA its longstanding position that it is not a party to UNCLOS, and that ‘the United States is not bound by Convention rules dealing with seabed mining through the International Seabed Authority.’ That clarity matters as America moves to develop these critical seabed resources responsibly under U.S. law.

Our planned operations are taking shape offshore and onshore. Allseas is moving from commercial framework to execution, carrying out the engineering, project management and vessel work needed to transform the Hidden Gem from a successful pilot into an integrated commercial production system. We believe our agreement with Eco Minerals gives us greater access to survey vessel and AUV capacity needed to explore effectively, while opening the door to joint projects and potential processing collaboration as those opportunities mature. Onshore, TMC USA is moving forward with Mariana Minerals as part of its owner’s team for a phased program at the Port of Brownsville, beginning with concept development and technical design work to establish plant feasibility, design basis, key trade-offs and targets for the operating agreement. As I’ve said before, our future onshore capital spending domestically is contingent on a majority of the funding coming from U.S. government sources. The momentum is continuing with advanced funding processes in progress with multiple U.S. agencies.

Finally, I was pleased to be invited to Washington, D.C. last week for the President’s American Mining Roundtable, which included significant airtime for seafloor resources and further underscored what the U.S. State Department reiterated in July at the ISA meeting: ‘responsible seabed mineral development is a strategic national security and economic priority.’

A secure U.S. critical seabed minerals supply chain is moving from policy ambition to physical execution, and TMC is proud to play a leading role.”

Operational Highlights

TMC USA Enters into MSA with Mariana Minerals

On July 21, 2026, TMC USA entered into a Master Services Agreement with Mariana Minerals for a phased program to advance a proposed polymetallic nodule processing and refining industry park at the Port of Brownsville, Texas, beginning with mobilization, concept development and technical design work to establish plant feasibility and design basis, as well as a trade-off and opportunity assessment program for Phase 1, Stage 1 of the proposed onshore nodule processing facility in the Port of Brownsville, Texas.

TMC and Eco Minerals Enter Exclusive Offshore Survey and Exploration Services Agreement

On July 22, 2026, TMC and Eco Minerals entered into a Mutual Master Services Agreement under which Eco Minerals will serve, subject to vessel availability, as TMC’s exclusive provider of vessel charter and marine survey services, including advanced seafloor mapping, sampling and autonomous survey capabilities. TMC will provide Eco Minerals with environmental and regulatory advisory services, drawing on its offshore assessment and permitting experience. The companies may jointly pursue third-party survey and exploration services opportunities. The agreement builds on an existing memorandum of understanding identifying TMC as a potential processing partner for Eco Minerals, subject to a standards-compliant prefeasibility study, due diligence, definitive agreements and required regulatory approvals.

TMC USA’s USA-A and USA-B Applications Continue Through DSHMRA Review

NOAA’s review of TMC USA’s consolidated USA-A exploration license and commercial recovery permit application and USA-B exploration license application continues under DSHMRA and its implementing regulations. NOAA formally certified the USA-B application on May 26, 2026; certification is an intermediate eligibility determination, not the final issuance of a license or permit. The rigor of NOAA’s review supports the long-term durability and legal defensibility of any licenses or permits issued and reinforces the high standards applicable to all applicants. The USA-A application area covers approximately 65,000 km² of seafloor and contains an estimated 619 million tonnes of polymetallic nodules, with potential upside of approximately 200 million additional tonnes; the USA-B application area covers approximately 122,000 km² of seafloor and hosts an estimated 1.02 billion tonnes of polymetallic nodules based on TMC’s Technical Report Summary for the Initial Assessment published in August 2025.

International Tribunal for the Law of the Sea Unanimously Orders ISA to Respect NORI and TOML’s Due Process Rights. NORI Exploration Contract Renewed

On July 18, 2026, the Seabed Disputes Chamber of ITLOS ordered the prescription of provisional measures to protect the rights of our subsidiaries, NORI and TOML, in their proceedings against the ISA. In the first contentious cases ever decided by the Chamber under Part XI of UNCLOS, the Chamber confirmed its jurisdiction, recognized that NORI and TOML have rights to due process and fair treatment, found a real and imminent risk of irreparable prejudice to those rights, and prescribed provisional measures requiring the ISA to act in accordance with the applicable legal framework, including rules of due process.

Following the ruling, the ISA Council approved by consensus a five-year extension of NORI’s exploration contract in the Clarion-Clipperton Zone. Together, TMC believes these decisions provide greater regulatory certainty for NORI and its Sponsoring State, Naoero (formerly known as Nauru), and demonstrate that ITLOS is a vital part of the institutional machinery established under UNCLOS, ensuring critical oversight and accountability.

NOAA Certifies TMC USA’s USA-B Exploration License Application

On May 26, 2026, NOAA formally certified the USA-B exploration license application submitted by our U.S. subsidiary, TMC USA. Certification is an intermediate determination by NOAA confirming an applicant’s eligibility (based on financial responsibility, technological capability, prior obligations, and plan adequacy) for an exploration license or commercial recovery permit, but it is not the final issuance of that license or permit.

TMC and Allseas Sign Commercial Agreement for the First Offshore Nodule Recovery Operation

On May 11, 2026, we announced that we had signed a Contract for Development Work and Commercial Production with our strategic partner and investor Allseas, a global leader in offshore pipeline installation, heavy lift and subsea construction, for the development, commissioning and operation of the first commercial polymetallic nodule collection system. The agreement establishes the commercial framework for advancing offshore nodule recovery operations and builds on the successful pilot collection test completed in 2022. The commercial system is expected to have a nameplate production capacity of 3.0 million wet tonnes of nodules per annum, with commissioning targeted to begin in Q4 2027, subject to regulatory approvals.

NOAA Determines TMC USA’s Consolidated Deep-Seabed Mining Application for USA-A Area is in Full Compliance

On April 28, 2026, NOAA determined that the consolidated application by our subsidiary, TMC USA, for an exploration license and commercial recovery permit for the USA-A area under DSHMRA is in full compliance with the requirements of the Act and its implementing regulations, marking a key step in the U.S. regulatory and permitting process. The news follows the earlier determination of substantial compliance of the application on March 6, 2026, and represents another step along the path of regulatory milestones.

TMC Subsidiaries Submit Massive Deep-Sea Dataset to Public Database as Company Launches Video Series on Findings of Environmental Research

On April 15, 2026, we announced that our subsidiaries, NORI and TOML, had submitted extensive environmental datasets to the ISA’s DeepData database, covering a decade of exploration activities in the Clarion-Clipperton Zone. The submission includes data from 777 equipment deployments and more than 4,800 environmental samples, generating approximately 76,000 biological records and 69,185 geochemical data points across the full water column and seafloor environment. Key findings are showcased in a new video series demonstrating how the data addresses environmental concerns and how innovation has reduced the impact footprint of TMC’s collection system versus legacy technology.

Industry Update

The Metals Royalty Co. (Nasdaq: TMCR) Begins Public Trading

On April 8, 2026, The Metals Royalty Co. began public trading (Nasdaq: TMCR). TMCR has a 2.0% Gross Overriding Royalty on the NORI area from a 2023 transaction which was previously announced. As part of the agreement, TMC was granted an equity stake in TMCR, which currently represents 22.4% of TMCR’s outstanding equity following our additional investment in TMCR in May 2026. TMC retains the right to repurchase up to 75% of the NORI Royalty at an agreed capped return, exercisable in two transactions, between the second and the tenth anniversary of the agreement. If both repurchase transactions are executed, TMCR’s remaining gross overriding royalty on the NORI project revenue will be 0.5%.

U.S. Department of State Commentary at ISA and UN Meetings

The U.S. has once again reminded the world of the strategic opportunity presented by the responsible development of deep seabed minerals, and its clear and longstanding legal right to regulate their exploration and commercial recovery in the high seas. In a statement delivered last month at the ISA, the U.S. State Department commented:

“For the United States, responsible seabed mineral development is a strategic national security and economic priority; we view seabed minerals in the broader context of critical mineral supply chain security. Global demand for critical minerals is rising rapidly, and diversified supply chains are necessary for geopolitical and economic stability. Humankind depends on modern technologies. It is prudent that we acknowledge that ocean resources can meet this demand with impacts significantly lower than many land-based alternatives.”

Financial Results Overview

At June 30, 2026, we held cash of approximately $98.7 million and held no financial debt. We believe that our cash position will be sufficient to meet our working capital and capital expenditure commitments for at least the next twelve months from today.

We reported a net loss of approximately $60.1 million, or $0.14 per share, for the quarter ended June 30, 2026, compared to a net loss of $74.3 million, or $0.20 per share, for the quarter ended June 30, 2025. Exploration and evaluation expenses during the quarter ended June 30, 2026 were $56.1 million compared to $10.5 million for the quarter ended June 30, 2025. The second quarter of 2026 included $37.2 million in settlement of initial costs and other negotiated costs owed to Allseas following the signing of a development and operating agreement, higher share-based compensation expense and an increase in prefeasibility study costs.

General and administrative expenses were $15.6 million for the quarter ended June 30, 2026, compared to $11.5 million for the quarter ended June 30, 2025, reflecting higher share-based compensation and payroll costs.

Conference Call

We will hold a conference call on August 13, 2026, at 4:30 p.m. ET to provide an update on recent corporate developments and second quarter 2026 financial results.

Second Quarter 2026 Conference Call Details

The virtual webcast will be available for replay in the ‘Investors’ tab of the Company’s website under ‘Investors’ > ‘Media’ > ‘Events and Presentations’, approximately two hours after the event.

The Metals Company is a developer of lower-impact critical metals from seafloor polymetallic nodules, on a dual mission: (1) supply metals for energy, defense, manufacturing and infrastructure with net positive impacts compared to conventional production routes and (2) trace, recover and recycle the metals we supply to help create a metal commons that can be used in perpetuity. The Company has conducted more than a decade of research into the environmental and social impacts of offshore nodule collection and onshore processing. More information is available at www.metals.co.

Contacts

Media | media@metals.co

Investors | investors@metals.co

Forward-Looking Statements

This press release contains forward-looking statements and information within the meaning of the Private Securities Litigation Reform Act of 1995. These statements may be identified by words such as anticipates, believes, could, estimates, expects, intends, may, plans, possible, potential, should, will, would and variations of these words or similar expressions, although not all forward-looking statements contain these words. Forward-looking statements in this press release include, but are not limited to, statements with respect to: the Company's strategy to pursue exploration and commercial recovery of seafloor polymetallic nodules under the U.S. regulatory regime; the anticipated certification, public notice, public comment, environmental review, including the EIS process, and final determination process for the consolidated application submitted to NOAA under DSHMRA and for the USA-B exploration license application, including the scoping and EIS process initiated by the Notice of Intent; the anticipated scope, timing and outcome of NOAA's review of the consolidated application and the USA-B exploration license application; the Company's expectation that the NOAA process will conclude in advance of offshore vessel commissioning; the expected development, commissioning and operation of the first commercial nodule collection system under the Agreement with Allseas, including the nameplate production capacity of 3.0 million wet tonnes per annum and the expected timing of system commissioning in Q4 2027; the phased program with Mariana Minerals to advance a proposed U.S.-based nodule processing and refining industry park at the Port of Brownsville, Texas, including the establishment of plant feasibility and design basis; the Company's expectation that future onshore capital spending will be contingent on a majority of the funding coming from U.S. government sources, and the status and outcome of funding processes with multiple U.S. government agencies; the Company's belief that its total liquidity will be sufficient to meet its working capital and capital expenditure commitments for at least the next twelve months; the Company's expectation that its first-mover positioning will enable it to help accelerate the development of a broader U.S.-led nodule industry, including the potential to process third-party nodules in the future; the anticipated benefits of the Mutual Master Services Agreement with Eco Minerals, including exclusive vessel charter access and survey capabilities, the joint pursuit of third-party opportunities and potential processing collaboration, in each case subject to vessel availability, definitive agreements, government financing and required approvals; the estimated resource potential of the USA-A and USA-B areas, including estimated nodule tonnages and potential exploration upside, and the resource estimates described in the Company's technical reports; the anticipated effect of the provisional measures prescribed by the Seabed Disputes Chamber of ITLOS and of the ISA Council's approval of the five-year extension of NORI's exploration contract, including the expectation that these decisions provide greater regulatory certainty. The Company may not actually achieve the plans, intentions or expectations disclosed in these forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result of various factors, including, among other things: the scope, timing and outcome of NOAA's review of the consolidated application and the USA-B exploration license application, including the conduct of the environmental review under the National Environmental Policy Act, the nature and volume of public comments received, the absence of any mandatory statutory deadline under DSHMRA and the risk of further delay; the terms of any exploration license or commercial recovery permit ultimately granted, including the risk that the terms, conditions and restrictions imposed are more restrictive than anticipated; potential legal challenges in U.S. courts by third parties claiming to be adversely affected or aggrieved by NOAA's actions; the need for continued U.S. policy support and the effect of shifts in political priorities, legal interpretations or agency leadership, and opposition to deep-seabed mining from governments, non-governmental organizations and other third parties; the ability to obtain an exploitation contract from the International Seabed Authority or permits from the U.S. government, risks related to the Company's dual-path permitting strategy, the ISA's response to the provisional measures prescribed by the Seabed Disputes Chamber of ITLOS and the outcome of the proceedings brought by NORI and TOML against the ISA; the successful continuation of the Company's alliance with Allseas, including under the commercial agreement described in this press release, and Allseas' ability to perform as expected; the development, testing, integration, scaling, commissioning and operation of the offshore collection system and its key components; the performance of other contractors and counterparties, including the risks that the Mariana Minerals phased program does not proceed beyond its initial stage or does not establish plant feasibility on acceptable terms and that the definitive agreements contemplated with Eco Minerals are not entered into; changes in environmental, mining and other applicable laws and regulations; the availability of and access to capital on acceptable terms and the sufficiency of the Company's cash, including for amounts needed to fund its share of costs under the commercial agreement described in this press release, and the Company's dependence on U.S. government funding for a majority of onshore capital spending and the risk that U.S. government funding processes do not result in awards with terms, conditions or contingencies favorable to the Company; risks related to strategic partnerships and technology sharing; uncertainties relating to processing nodules at commercial scale and to the accuracy of resource estimates; metals price volatility; the outcome of any pending or future litigation; and other risks and uncertainties described in greater detail in the section entitled Risk Factors in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, filed with the U.S. Securities and Exchange Commission on March 31, 2026, in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed on May 14, 2026, and in the Company's subsequent Quarterly Reports on Form 10-Q and Current Reports on Form 8-K filed with the SEC. Any forward-looking statements contained in this press release speak only as of the date hereof, and the Company expressly disclaims any obligation to update any forward-looking statements contained herein, whether because of any new information, future events, changed circumstances or otherwise, except as otherwise required by law.

TMC the metals company Inc.

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