Principal Mineral announced that it has acquired Isola Group, a manufacturer of copper-clad laminates and dielectric prepregs used in printed circuit boards.
The transaction closed on June 16, 2026. Principal Mineral also announced approximately $280 million in new funding to support its next phase of strategic growth.
The funding was co-led by Overmatch Ventures and The New Industrial Corporation, with participation from J2 Ventures, Ensemble VC, and other existing and new investors. The financing also included a credit facility from Lane42 Investment Partners.
Principal Mineral said the capital will support integration of the combined company, expansion of advanced manufacturing capacity, continued technology development, and long-term investment in critical supply-chain capabilities across North America, Europe, and Asia.
The acquisition strengthens Principal Mineral’s platform in critical materials and upstream electronics manufacturing. The company said the transaction enhances supply-chain resilience for advanced technology end markets including aerospace, communications and satellites, AI infrastructure, and energy applications.
Isola’s copper-clad laminates and dielectric prepregs are foundational materials used in advanced printed circuit boards. Combined with Camden Copper, which Principal Mineral describes as North America’s only producer of electrodeposited copper foil, the acquisition gives Principal Mineral a broader role across the electronics value chain.
Together, Camden Copper and Isola bring together two essential PCB materials: copper foil and copper-clad laminates. Principal Mineral said the combined offering will expand manufacturing capabilities and improve access to materials used in advanced electronics systems.
Following the acquisition, Principal Mineral will employ about 1,300 people across 10 facilities worldwide. The combined company’s operations will span manufacturing, research and development, technical support, and sales.
Principal Mineral CEO and Co-Founder Adam Johnson will serve as CEO of the combined company, and the company’s existing leadership team will manage the business. Sean Mirshafiei, President of Isola, will lead day-to-day operations at Isola and report to Johnson. Travis Kelly, CEO of Isola, will transition to an advisory role.
The acquisition follows Principal Mineral’s 2025 acquisition and relaunch of Camden Copper in Camden, South Carolina. That deal preserved a U.S. copper foil plant supplying defense-grade electrodeposited copper foil for PCBs used in advanced technology systems.
Principal Mineral said its strategy is focused on rebuilding the industrial “missing midstream” of the critical materials supply chain, which it defines as the layer between upstream metals and finished technologies used in advanced electronics, communications equipment, AI infrastructure, defense, and energy applications.
KEY QUOTES:
“The addition of Isola advances our mission to build resilient supply chains that power the world’s most important technologies. Together with our existing operations, Isola strengthens the manufacturing capabilities that underpin advanced electronics, helping reduce supply-chain vulnerabilities while ensuring customers have reliable access to the materials needed for aerospace, communications and satellites, AI infrastructure, and energy applications.”
Adam Johnson, Chief Executive Officer and Co-Founder of Principal Mineral
“Over the past several years, Isola’s global team has worked hard to transform this company by strengthening our operations, expanding our technologies, and consistently delivering for our customers in a challenging industry environment. I’m very proud of what we have accomplished, and as a result, we are in a position of strength to begin this next chapter with Principal Mineral. I know that their commitment to growing our people, capabilities, and global footprint will help Isola build on its century of excellence and capture the significant opportunities ahead.”
Travis Kelly, Chief Executive Officer of Isola
“This is an investment in continuity for Isola’s employees and customers, and in the operational stability and technical expertise that have defined the company for more than a century. We’re putting long-term capital behind manufacturing capabilities to deliver the high-quality materials that people depend on every day.”
Wes Spurlock, Chief Operating Officer and Co-Founder of Principal Mineral
