magnesium
(7)
Alex Grant
Alex Grant is the co-founder and CEO of Magrathea, an Oakland-based startup building a new electrolytic process to make magnesium metal from seawater and brine with near-zero carbon emissions. A chemical engineer who previously founded lithium-extraction company Lilac Solutions and modeled battery supply chains at Minviro, Grant started Magrathea in 2022 to reshore US magnesium production. What began as a climate play turned into a national-security one: after Russia's invasion of Ukraine tightened global magnesium supply, Magrathea won a Defense Production Act partnership with the US Department of Defense. He was a Forbes 30 Under 30 honoree in Energy in 2021.
Duranium
Duranium is a Y Combinator (S25) advanced-materials company reshoring U.S. production of critical metals - titanium, magnesium, aluminum, zirconium and hafnium. It modernizes carbochlorination metallurgy with a novel reactor that recirculates CO and chlorine streams back into feedstock and spins off a saleable co-product (bleaching agents/hypochlorite), aiming to match Chinese-level pricing without subsidies while eliminating direct emissions. Founded in 2025 by CEO Brenden Prins-McKinney and CTO Berkley Noble, the company targets a pilot facility by June 2026 and roughly 12% of the U.S. magnesium market by 2029.
Tidal Metals
Tidal Metals is a Trenton/Hamilton, New Jersey deep-tech company that extracts primary magnesium metal from seawater and desalination brine using nothing but renewable electricity and physical processes - no ore mining, no carbon emissions, and no waste stream. Founded by three plasma-physics PhDs who met at the Princeton Plasma Physics Laboratory, the company aims to rebuild a domestic U.S. magnesium supply chain currently dominated by China, serving aerospace, defense, and next-generation automotive manufacturing.
Brenden Prins-McKinney
Brenden Prins-McKinney is the co-founder and CEO of Duranium (YC S25), an Alameda, California company working to bring critical light metal production - titanium, magnesium, aluminum, zirconium and hafnium - back to American soil. A Stanford Law graduate and Knight-Hennessy Scholar with a research background at McKinsey and a stint as a Goldman Sachs banker, he advised the Department of Defense on reshoring critical chemical production before deciding to build the supply chain himself. He pairs a policy-and-finance brain with chemistry borrowed from the 1950s, modernized so the U.S. can make metals it currently buys almost entirely from China and Russia.
Howard Yuh
Howard Yuh is a plasma physicist turned founder who is trying to break China's grip on magnesium by pulling the metal out of the ocean. As CEO and cofounder of Tidal Metals, the New Jersey deeptech he spun out of his earlier desalination venture GreenBlu, he uses an adsorption temperature-swing vapor pump - a trick borrowed from fusion research - to extract magnesium salt from seawater with only electricity, no mining, and no waste. The company raised $8.5M in seed funding led by DCVC in 2024 and won the World Economic Forum's Sustainable Mining Challenge the same year.
Magrathea
Magrathea is an Oakland, California clean-tech company rebuilding American magnesium production. Using a next-generation electrolytic process, it makes magnesium metal from seawater and brines with near-zero carbon emissions, aiming to break the West's dependence on Chinese supply for a metal critical to aerospace, automotive, and defense.
Vivoo
Vivoo is a San Francisco-based health tech company that makes at-home urine test strips analyzed via smartphone camera. Founded in 2017, the company offers a wellness platform that measures 8+ biomarkers — including hydration, vitamins, minerals, pH, ketones, and oxidative stress — and delivers personalized nutrition and lifestyle recommendations through a free mobile app. Backed by $19.4M in funding led by Tim Draper, Vivoo is sold at Target, Walmart, and Sam's Club, and has expanded to 100+ countries with a focus on making lab-grade health insights accessible to everyday consumers.