The round was led by Serendipity Capital, a leading deep tech investor, with participation from 55 North, the world's largest dedicated pure play quantum fund, and Global Innovation Labs. Founded in 2025, Monarch entered 2026 with more than $60 million in customer contracts from leading quantum companies including Quantinuum, Infleqtion and NASA, bringing total capital and customer contracts to more than $115 million within six months of founding.

Monarch Quantum is a U.S.-based quantum photonics company building integrated photonics systems - Quantum Light Engines™ - for quantum computing, sensing, and communications. Monarch Quantum combines best-in-class photonics components with systems engineering and advanced packaging to enable scalable, deployable quantum hardware. The company serves quantum OEMs, national laboratories, defense integrators, and advanced research institutions worldwide.