United States · Venture startup
Funding summaryUpdated 26 Oct 2026
$146Mraised across 3 rounds since 2019, from 3 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
National Science Foundation
International Finance Corporation
Breakthrough Energy
Energy Impact PartnersSource recorded
National Science FoundationInternational Finance CorporationBreakthrough EnergyEnergy Impact Partners
Aramco VenturesSource recorded
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
National Science FoundationInternational Finance CorporationBreakthrough EnergyEnergy Impact PartnersAramco Ventures
The EngineBreakthrough Energy Ventures/ PreludeMissing a round, or an investor who was in one? Tell us.
These 4 firms list Boston Metal as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Boston Metal's investors include National Science Foundation, International Finance Corporation, Breakthrough Energy, Energy Impact Partners and Aramco Ventures, and 2 more on record.
Boston Metal has raised $146M across 3 rounds since 2019.
Boston Metal's most recent round was a Venture of $75M in May 2026.
Its most recent round, $75M in May 2026, is also its largest on record.
Boston Metal's first round on record, in Jan 2019, was backed by The Engine and Breakthrough Energy Ventures/ Prelude.
Boston Metal's latest named round is a Venture, in May 2026.
Boston Metal is based in the United States.
In the same sector, and raised in the last eighteen months.
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