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Boston Metal

Woburn, MA, USA Clean Energy & Materials Private

Boston Metal is an MIT spinout developing molten oxide electrolysis (MOE) technology to decarbonize steel and critical metals production. The company's patented electrochemical process produces metals using renewable electricity without carbon emissions, replacing fossil fuels in a one-step process. Boston Metal has commissioned industrial-scale MOE cells in Woburn, MA and operates subsidiaries in Brazil, targeting commercial-scale production in 2026.

Overview

Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.

Founded

2012

Employees

200–250

Total Funding

$403M

7 rounds

Latest Valuation

$0.61B

July 10, 2025

Funding

Total raised $403M across 7 rounds

Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.

Last updated 06-25-2026

Latest Round

Type

Convertible Note

Date

July 10, 2025

Amount

$51M

Valuation

Lead Investors

BHP VenturesBreakthrough Energy VenturesPiva CapitalSiteGround
DateRoundAmount RaisedValuationLead Investors
July 10, 2025 Convertible Note $51M BHP Ventures, Breakthrough Energy Ventures, Piva Capital +1 more
January 30, 2024 Series C2 $20M Marunouchi Innovation Partners
September 6, 2023 Series C (final close) $142M Aramco Ventures, M&G Investments, Baillie Gifford

Prominent Investors

Marunouchi Innovation Partners

Leadership

  • Tadeu Carneiro

    Chief Executive Officer & Chairman

    LinkedIn
  • Donald Sadoway

    Founder & MIT Professor

  • Antoine Allanore

    Founder & MIT Professor

  • James Yurko

    Co-Founder

Competitors

Competitor list is illustrative and may be incomplete, stale, or erroneous.

  • Electra

    Steel production company focused on electrifying and decarbonizing steelmaking using renewable energy with zero carbon dioxide emissions. Develops advanced AE electrolysis technology.

  • H2 Green Steel

    Swedish green steel producer founded in 2020 focused on decarbonization of the steel industry through green steel and green hydrogen production, significantly reducing CO2 emissions compared to traditional steelmaking.

  • Appalachian Iron

    Iron and steel company aiming to establish zero-carbon plants across the United States.

  • HYBRIT (Hydrogen Breakthrough Iron Technology)

    Joint venture focused on hydrogen-based direct reduction of iron ore for zero-carbon steel production with leading technological advantage in the sector.

  • Blastr Green Steel

    Green steel producer utilizing advanced manufacturing processes to reduce carbon emissions in steel production.

  • Midrex

    Global leader in direct reduction technology and equipment for steelmaking industry, focusing on decarbonization through hydrogen and electricity-based processes.

Boston Metal Investment FAQ

Public status and buying access

No. Boston Metal is a private company and does not have a public stock ticker or trade on a public stock exchange. Its shares are generally held by founders, employees, investors, and other private shareholders. Buyers and sellers may be able to transact in Boston Metal shares through private secondary transactions, but any transaction depends on share availability, buyer and seller agreement, transfer restrictions, company approval rights, and any applicable right of first refusal. There is no guarantee that Boston Metal will complete an IPO or other liquidity event.

Yes, it is sometimes possible to buy Boston Metal shares pre-IPO through private secondary transactions. This depends on finding a willing seller, company approval, and satisfying any transfer restrictions or rights of first refusal.

Buyers interested in buying Boston Metal shares on the secondary market typically do so through SetterVC and other secondary-market platforms, subject to eligibility requirements, share availability, transfer restrictions, and issuer approval. Buyers may need to satisfy sophistication, accreditation, institutional, platform, regulatory, or other eligibility requirements before participating. Once eligible, buyers may be able to view listings, make bids, and work with a licensed broker through the transaction process. Buyers should ensure they have appropriate legal and financial advisors guiding them before completing any transaction.

The company's latest round valuation was approximately $610M as of July 10, 2025. The latest round valuation is often used as one reference point in secondary-market pricing, but secondary prices may be above or below that valuation at any given time. Secondary pricing can shift significantly based on post-round conditions, such as changes in company performance, supply-demand dynamics, share class, transaction size, transfer restrictions, or broader market shifts. Any implied valuation from a past round should be confirmed with a broker or through live market listings before relying on it.

Valuation and funding

Boston Metal was most recently valued at approximately $610M as of July 10, 2025. This is a private valuation and may differ from secondary pricing. Secondary shares may trade above or below this mark based on various factors. SetterVC and Setter Capital does not verify the accuracy of these valuations. Buyers and sellers should always confirm current valuations before completing any transaction.

Boston Metal's latest disclosed funding round was a Convertible Note round in July 10, 2025. The round raised approximately $51M, with BHP Ventures, Breakthrough Energy Ventures, Piva Capital and SiteGround listed as disclosed lead or major investors. Primary funding rounds are different from secondary transactions: in a primary round, capital goes to the company, while in a secondary transaction, investors buy existing shares from current shareholders. Funding-round data reflects publicly reported or collected information and may be incomplete.

Boston Metal has raised approximately $403M in disclosed funding across 7 rounds. These figures reflect primary capital raised by the company and do not include every possible secondary transaction, undisclosed round, debt facility, or private transfer. Reported funding totals can change as new rounds are announced or older round details are corrected. Eligible users can use SetterVC to track Boston Metal's funding history alongside private-market activity where available.

Boston Metal's disclosed investors include Marunouchi Innovation Partners. Investor lists are based on public reporting, company announcements, and collected funding-round data, and may be incomplete. Participation in a prior funding round does not mean those investors are currently buying or selling shares. On SetterVC, eligible users can review Boston Metal's funding history, valuation history, and private-market activity alongside other venture-backed companies.

Market context

Boston Metal's most-cited competitors include Electra, H2 Green Steel, Appalachian Iron, HYBRIT (Hydrogen Breakthrough Iron Technology), Blastr Green Steel and Midrex. Investors often compare these companies by sector, product focus, valuation, funding raised, growth signals, investor base, and private-market activity.

Secondary-market demand for Boston Metal shares can be affected by company performance, revenue growth, profitability, funding history, valuation, investor interest, sector momentum, public-market conditions, expected timing of a liquidity event, and the availability of shares for sale. Demand can also be affected by transfer restrictions, company approval rights, right of first refusal processes, limited information, and the price expectations of buyers and sellers. Strong demand does not guarantee strong pricing, liquidity, or investment returns. Weak demand does not necessarily reflect the company's long-term prospects. Demand signals should not be treated as a recommendation or prediction of investment performance. Buyers and sellers should treat demand signals as informational and conduct their own diligence before transacting.

Selling and transaction mechanics

Sellers often rely on intermediaries and platforms, such as SetterVC and other secondary-market platforms, to identify potential buyers. The exact process varies by company and transaction, but sellers often begin by confirming their ownership, desired price, transferability, and any company approval or notice requirements. If the seller agrees with a buyer on acceptable price and terms, the company may need to be notified through a share transfer notice or similar process. If a right of first refusal, company approval right, or other transfer restriction applies, the seller may need to wait until that process is completed. The parties may then execute a purchase and sale agreement, complete required transfer documentation, and close if all required conditions are satisfied. Sellers should always seek proper legal and financial advice before completing the transaction.

Yes, current and former Boston Metal employees, early investors, and other existing shareholders may be able to sell vested shares before an IPO through a private secondary sale. This is not automatic; it depends on whether the shareholder has transferable shares, whether there is buyer demand, and whether the company's governing documents permit the transfer. Many companies require prior notice, company approval, or a right of first refusal before shares can be sold. Sellers should also seek proper legal and financial advice before proceeding.

A Boston Metal secondary transaction usually involves an existing shareholder selling shares to a buyer before a public listing. The buyer and seller typically agree on price, number of shares, share class, and closing conditions. The seller may then need to notify Boston Metal through a share transfer notice or similar process. If Boston Metal or existing investors have approval rights, transfer restrictions, or a right of first refusal, those steps may need to be completed before the transfer can close. The parties typically enter into a purchase and sale agreement, complete any required transfer documentation, and close only if the necessary conditions are satisfied. Timing and certainty can vary by company and transaction.

In most private secondary transactions, parties commonly use a purchase and sale agreement that outlines price, terms, and conditions. They may also use share transfer documentation, often a stock transfer notice, share transfer notice, transfer instruction, or similar document, along with any required company approval or right of first refusal materials. Proof of ownership, such as a cap table entry, share certificate, brokerage statement, issuer confirmation, or administrator confirmation, may also be important. Buyers often request recent company financials, but private companies may limit disclosure. Since every deal varies, buyers and sellers should consult legal and financial advisors to understand which documents are needed.

Risk, diligence, and investor caution

Buying Boston Metal shares pre-IPO is risky. Shares are illiquid, no IPO or liquidity event is guaranteed, valuations can change, transfers may require company approval, and private companies may provide limited financial disclosure. Be prepared for total loss. SetterVC and Setter Capital do not provide due diligence, legal, tax, accounting, valuation, or investment advice. Buyers must conduct their own due diligence, verify information, and seek independent legal and investment advice before proceeding.

Private secondary shares are typically illiquid. Unlike public stocks, there is no active public market, so selling them can be difficult and time-consuming. Sales depend on finding a willing buyer and often require company approval. Investors should be prepared to hold the shares for an extended period, with no guarantee of a future sale. Always assess your need for liquidity before investing.

SetterVC and Setter Capital do not provide due diligence, legal, tax, accounting, valuation, or investment advice. Buyers must conduct their own due diligence, including verifying ownership, transferability, legal structure, company approval, and assessing the company's prospects. SetterVC and Setter Capital do not provide advice on whether an investment is good, what price to pay, or what the best bid or ask is. SetterVC and Setter Capital may share documents in some circumstances, but it does not guarantee their accuracy or completeness. Due diligence is essential. Seek legal and investment advice as needed.

Before buying Boston Metal shares, a buyer should try to review the share class, price per share, implied valuation, transfer restrictions, ROFR process, company approval rights, seller ownership evidence, recent financing or tender-offer information, available financial information, information rights, resale restrictions, tax considerations, and expected liquidity paths. Not all information may be available for a private company. Buyers should confirm available diligence, process details, and information needs with their own legal, tax, and investment advisers.

SPVs carry risks. Examples include the need to confirm the company allows SPV-based transfers, verify that the SPV truly owns the shares or interests it claims to own, and ensure it has not sold more interests than it holds. Due diligence is essential. Seek legal and investment advice as needed.

Forward contracts carry risks. Examples include the seller refusing to transfer the shares at the future date, even if the seller owns them, the seller going bankrupt with creditors claiming the shares, or the seller committing the same shares to multiple parties. Due diligence is essential. Seek legal and investment advice as needed.

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