Investing in Quantum: Key Public Companies in the US and Europe

This short analytical note frames Investing in Quantum as a question of European strategic autonomy, where a capability becomes strategically and financially relevant through alignment with recognised priorities, not the technology alone. Quantum computing has transitioned from pure research to an emerging industry, with a handful of companies now publicly traded. Many leading quantum players (e.g. Google, IBM, Microsoft) are large tech firms where quantum is a small segment, but direct exposure for investors comes from specialized pure-play quantum companies. Below we analyze the main publicly-listed companies in the quantum computing and related quantum technologies space (focusing on US and Europe), excluding still-private startups. For each company, we provide basic facts, financial metrics, business model, technology approach, partnerships, history, risks, and an investment outlook, enabling a side-by-side comparison. now IonQ (NYSE: IONQ) – Trapped-Ion Quantum Computing Leader Basic Data: IonQ, Inc. (ticker IONQ ) is listed on the NYSE. It was founded in 2015 and went public via SPAC in October 2021. Why this capability becomes strategically and financially relevant is developed in full in the original DFM publication on DFM Analysis.