J.F. Lehman & Company

J.F. Lehman & Company

J.F. Lehman & Company was founded in 1992 by John F. Lehman, who served as Secretary of the Navy under President Reagan and later as a member of the 9/11 Commission. The firm was built to invest exclusively in companies operating across the aerospace, defense, maritime, and environmental services sectors — a thesis anchored less in financial engineering than in the founder's operational and regulatory domain expertise. That lineage shapes the firm's identity: a sector-specialist middle-market investor whose principals spend decades inside a narrow but technically complex orbit of government-facing and national-security-adjacent industries. The firm targets control investments in companies with enterprise values typically between $50 million and $500 million, deploying capital across buyouts, corporate divestitures, and growth recapitalizations. Its portfolio has spanned ship repair, military vehicle components, aerospace aftermarket services, and specialized engineering for U.S. and allied government agencies. Known for rolling up fragmented supply chains that support long-cycle defense platforms, J.F. Lehman has owned businesses such as Atlantic Diving Supply, a distributor of tactical equipment to the U.S. Department of Defense, and Precision Aviation Group, an MRO provider for rotorcraft and fixed-wing aircraft. The firm invests primarily in North America and, increasingly, in allied defense markets including the United Kingdom and Australia. J.F. Lehman operates from its New York headquarters with a partnership that includes Louis Mintz, Alex Harman, and Stephen Brooks — each with tenure spanning multiple fund cycles and a consistent investment committee structure. The firm completed fundraising for JFL Equity Investors V, which closed at its hard cap (per public regulatory filings, 2020), reflecting a disciplined raise timed to its mid-market defense mandate. In February 2025, the firm announced a strategic investment in S&K Aerospace, a provider of supply chain management and logistics services to the U.S. Air Force and foreign military sales clients, reinforcing its niche in defense sustainment (per the firm, 2025). The firm's structural differentiator is the depth of its sector concentration combined with its duration — three decades of pure-play investing in regulated, government-dependent industrial markets has created a repeatable sourcing engine that large generalist firms cannot easily replicate. Senior deal professionals maintain active security clearances and relationships across the Pentagon, NATO, and allied procurement agencies, giving J.F. Lehman access to proprietary transaction opportunities that surface through defense contractor networks rather than broad auction processes.