# Boston Metal funding: rounds and investors > Boston Metal has raised $146M across 3 rounds since 2019. Investors include National Science Foundation, International Finance Corporation and Breakthrough... Source: https://millionrounds.com/company/boston-metal (Millionrounds; every figure on the page links to its filing or article) United States · [Venture startup](https://millionrounds.com/companies) # Who invested in *Boston Metal* 3 rounds we have observed, with the 7 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Construction Manufacturing Raised 6 months ago Funding summary Updated 26 Oct 2026 **$146M** raised across 3 rounds since 2019, from 3 sources **$20M** Series A **$51M** Round **$75M** Venture - **Latest round:** Venture, $75M May 2026 - **Step-up i:** 1.5× - **Investors:** 7 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2019 2020 2021 2022 2023 2024 2025 2026 **$20M** Series A **$51M** Round **$75M** Venture - **First round:** Series A, $20M - **Biggest round:** $75M - **Usual gap between rounds:** 6.5 years ## The rounds - **May 2026** Venture **$75M** *4 returning* [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [International Finance Corporation](https://millionrounds.com/fund/international-finance-corporation-ifc) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [Energy Impact Partners](https://millionrounds.com/fund/energy-impact-partners) Source recorded - **Jul 2025** Round **$51M** *5 new* [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [International Finance Corporation](https://millionrounds.com/fund/international-finance-corporation-ifc) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [Energy Impact Partners](https://millionrounds.com/fund/energy-impact-partners) [Aramco Ventures](https://millionrounds.com/fund/aramco-ventures) Source recorded - **Jan 2019** Series A **$20M** *2 new* [The Engine](https://millionrounds.com/fund/the-engine) Breakthrough Energy Ventures/ Prelude Reported by FinSMEs ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Series A** 2019 **Round** 2025 **Venture** 2026 [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [International Finance Corporation](https://millionrounds.com/fund/international-finance-corporation-ifc) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [Energy Impact Partners](https://millionrounds.com/fund/energy-impact-partners) [Aramco Ventures](https://millionrounds.com/fund/aramco-ventures) [The Engine](https://millionrounds.com/fund/the-engine) Breakthrough Energy Ventures/ Prelude ## Everyone who backed them [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) Government **2** rounds [International Finance Corporation](https://millionrounds.com/fund/international-finance-corporation-ifc) Government **2** rounds [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) VC firm **2** rounds [Energy Impact Partners](https://millionrounds.com/fund/energy-impact-partners) VC firm **2** rounds [Aramco Ventures](https://millionrounds.com/fund/aramco-ventures) Corporate VC **1** round [The Engine](https://millionrounds.com/fund/the-engine) VC firm **1** round Breakthrough Energy Ventures/ Prelude no record of our own yet **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=boston-metal). ## Also claim to have backed them 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. [BMW i Ventures](https://millionrounds.com/fund/bmw-i-ventures) Corporate VC Per its own site [Climate Investment](https://millionrounds.com/fund/climate-investment-ci) VC firm Per its own site [Fine Structure Ventures](https://millionrounds.com/fund/fine-structure-ventures) VC firm Per its own site [Marunouchi Innovation Partners](https://millionrounds.com/fund/marunouchi-innovation-partners) VC firm Per its own site ## Quick answers about Boston Metal ### Who invested in Boston Metal? Boston Metal's investors include National Science Foundation, International Finance Corporation, Breakthrough Energy, Energy Impact Partners and Aramco Ventures, and 2 more on record. ### How much has Boston Metal raised? Boston Metal has raised $146M across 3 rounds since 2019. ### When did Boston Metal last raise? Boston Metal's most recent round was a Venture of $75M in May 2026. ### What was Boston Metal's biggest round? Its most recent round, $75M in May 2026, is also its largest on record. ### Who backed Boston Metal first? Boston Metal's first round on record, in Jan 2019, was backed by The Engine and Breakthrough Energy Ventures/ Prelude. ### What stage is Boston Metal at? Boston Metal's latest named round is a Venture, in May 2026. ### Where is Boston Metal based? Boston Metal is based in the United States. ## Companies like Boston Metal In the same sector, and raised in the last eighteen months. [**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Apex** $1.1B · Oct 2026](https://millionrounds.com/company/apex)[**ZwitterCo** $58M · Oct 2026](https://millionrounds.com/company/zwitterco)[**Peak Energy** $163M · Oct 2026](https://millionrounds.com/company/peak-energy)[**Pennsylvania American Water** $43M · Oct 2026](https://millionrounds.com/company/pennsylvania-american-water)[**Mach9** $46M · Oct 2026](https://millionrounds.com/company/mach9) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app