Hertha Metals Raises $133.7M Series A Led by Khosla Ventures to Reshore U.S. Steelmaking

Hertha Metals Closes $133.7M Series A

Hertha Metals, a Conroe, Texas-based steel company working to reshore American iron and steel production, has raised a $133.7 million Series A round. The round was led by Khosla Ventures.

What Hertha Metals Does

The company's Flex-HER single-step process converts any grade of iron ore directly into crude steel or high-purity iron in one continuous reactor. The process uses natural gas or hydrogen as the reductant instead of coal-dependent blast furnaces.

According to the company, this approach yields production costs about 25% lower and emissions reductions of 50% with natural gas and up to 98% with hydrogen.

Hertha Metals operates a 360-ton-per-year demonstration plant in Conroe. It supplies high-purity iron to rare-earth magnet manufacturers and is in supplier qualification with major U.S. magnet producers.

The Investor Syndicate

The Series A was led by Khosla Ventures and includes participation from:

• Khosla Ventures
• Gates Frontier
• Pear VC
• Clean Energy Ventures
• Toyota Ventures
• Siemens Financial Services
• Doerr Capital
• U.S. Department of Defense's Industrial Base Analysis and Sustainment (IBAS) program
• Global Brain's Niterra SUISO no MORI Fund

The presence of the U.S. Department of Defense's IBAS program alongside industrial and strategic investors points to the dual commercial and national-security relevance of domestic iron and steel production capacity.

Why This Round Matters

The raise lands at the Series A stage, a point at which capital typically funds the transition from demonstration-scale operations toward commercial deployment. Hertha Metals already has a demonstration plant running in Conroe and is engaged in supplier qualification with major U.S. magnet producers — a signal that its high-purity iron output is being evaluated for real industrial supply chains rather than remaining purely developmental.

The investor list spans venture capital, corporate strategic investors, and government-adjacent funding, reflecting interest from both the energy-transition and defense-industrial sides of the market.

Acquisition Angle

For acquirers and strategic partners, Hertha Metals sits at the intersection of two priorities: reshoring of critical materials and decarbonization of a hard-to-abate industrial sector. The company's Flex-HER process is positioned as a drop-in alternative to coal-dependent blast furnaces, with the flexibility to run on natural gas today and hydrogen as that supply matures.

Its existing relationships with rare-earth magnet manufacturers — and its qualification status with major U.S. magnet producers — make it relevant to supply chains that extend beyond steel into defense and electrification end markets. That combination of process technology, demonstration-scale proof, and strategic supply-chain positioning is the kind of profile that draws both financial and corporate strategic interest.

With $133.7 million in new capital and a syndicate that includes Khosla Ventures, Gates Frontier, Toyota Ventures, Siemens Financial Services, and the DoD's IBAS program, Hertha Metals now has the backing to scale its Conroe operations and deepen its supplier qualifications.

Key Facts at a Glance

• Company: Hertha Metals
• Headquarters: Conroe, Texas
• Round: Series A
• Amount: $133.7 million
• Lead investor: Khosla Ventures
• Technology: Flex-HER single-step process converting any grade of iron ore directly into crude steel or high-purity iron
• Demonstration plant: 360 tons per year in Conroe
• Claimed impact: ~25% lower production costs; 50% emissions reduction with natural gas, up to 98% with hydrogen