Advisory & Statecraft
Counsel to boards and C-suites navigating the seam between markets and government — energy security, defense industrial policy, and cross-border strategy.
Washington, DC
I. The Firm
A private holding company investing in energy, industry, and the institutions that secure them.
Green Mantel Holdings is a private holding company. We acquire, build, and steward enterprises at the intersection of energy, industry, and national interest — assets whose value compounds across decades, not quarters.
II. Holdings & Platforms
Counsel to boards and C-suites navigating the seam between markets and government — energy security, defense industrial policy, and cross-border strategy.
Washington, DCEarly positions where the next industrial base is being decided — advanced energy, autonomy, and the compute that commands them.
Emerging DomainsThe castings and forgings beneath reactors, turbines, and hulls — melt shop to machined component, held on American ground.
Domestic ManufactureCounsel to boards and C-suites navigating the seam between markets and government.
The decisions that price energy and industry are no longer made in markets alone. Tariff schedules, permitting regimes, export controls, and security reviews now move capital as surely as interest rates — and they move first in Washington.
Green Mantel advises principals directly: positioning companies inside the policy that shapes them, and bringing government the industrial judgment it cannot generate alone. Statecraft is not a service line here. It is the operating environment.
Washington, DCEarly positions where the next industrial base is being decided — advanced energy, autonomy, and the compute that commands them.
Every industrial era begins as a frontier: contested, unpriced, and easy to dismiss. Advanced nuclear, autonomous systems, and industrial-scale compute are at that threshold now — the technologies that will determine which nations set terms in the coming century.
New Frontiers is where Green Mantel moves earliest: backing founders building ahead of consensus, in domains where commercial markets and national missions converge.
Emerging DomainsThe castings and forgings beneath reactors, turbines, and hulls — melt shop to machined component, held on American ground.
America built this capability deliberately and let it go. The presses that forged the first nuclear fleet were scrapped; the melt shops that poured their ingots closed behind them. Today the reactors, turbines, and warships the country has committed to build depend on a handful of foreign forges, and the queue in front of them runs into the next decade.
GmH Heavy Industries is our answer: an integrated American enterprise assembled to melt, forge, cast, treat, and machine the components no domestic supplier can deliver today — built with the customers who need them and the government that requires them.
Domestic Manufacture