Christian Weedbrook, the founder of quantum computing startup Xanadu Quantum Technologies Ltd., became a billionaire this week after a steep run-up in the company's stock price. Over a span of six trading sessions, Xanadu's shares rose from below $8 to about $40, a move that placed the company's market capitalization above $11 billion in early trading on Friday.
The recent surge in Xanadu's stock occurred after Nvidia Corp. released open-source artificial intelligence models on Tuesday that were described as designed to support quantum computing research. Market reaction to that release coincided with the sharp appreciation in Xanadu's share price.
According to a filing with the Securities and Exchange Commission dated March 26, Weedbrook holds a 15.6% ownership stake in Xanadu. Based on the recent share price, his holding is valued at more than $1.6 billion.
Toronto-based Xanadu is developing quantum computing infrastructure with an aspiration to build one of the first quantum data centers by 2030. The company’s technical approach involves quantum machines that route photons through fiber-optic connections.
Financially, Xanadu reported $4.6 million in revenues last year. In 2025, the company recorded $55.2 million in research and development expenses. The company does not expect to generate profits in the near term.
The rapid move in Xanadu's share price and the resultant revaluation underscore the market's sensitivity to developments at the intersection of artificial intelligence and quantum computing. The immediate valuation change also had a direct impact on the net worth of the company's founder given his disclosed stake.
Summary
- Over six trading sessions, Xanadu's stock climbed from under $8 to roughly $40, pushing the company's market cap above $11 billion.
- The rally followed Nvidia's release of open-source AI models on Tuesday aimed at supporting quantum computing research.
- Founder Christian Weedbrook owns 15.6% of Xanadu per a March 26 SEC filing; his stake is now valued at more than $1.6 billion.
Context and company position
Xanadu, headquartered in Toronto, is pursuing a strategy to establish quantum data center capability by 2030 using photonic quantum computers that transmit photons through fiber-optic links. The company generated $4.6 million in revenue last year and incurred substantial research and development costs, recording $55.2 million in R&D expenses in 2025. Management does not expect profitability in the near term.
Market reaction
The timing of Nvidia's open-source AI model release and the ensuing investor response coincided with the six-session stock advance, which materially increased Xanadu's market valuation and the paper wealth tied to large shareholders' holdings.