I Squared Capital

I Squared Capital I Squared Capital is a major global infrastructure PE firm with $50B+ in AUM (November 2025). ISQ Fund III closed at $15.5B (2022). The portfolio spans 90+ companies across 70 countries with 66,000+ employees. Focus areas include energy infrastructure, utilities, transport/logistics, digital infrastructure, and environmental/social infrastructure. Notable deals include Arriva (UK rail from Deutsche Bahn), Viridian (Irish power, €1B), and Lincoln Clean Energy (sold to Ørsted for