It is hard to beat the list present at Quantum computing report: quantumcomputingreport.com/players/.
The much less-complete Wikipedia page is also of interest: en.wikipedia.org/wiki/List_of_companies_involved_in_quantum_computing_or_communication It has the merit of having a few extra columns compared to Quantum computing report.

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One of their learning sites: www.qutube.nl/
The educational/outreach branch of QuTech.

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Not a quantum computing pure-play, they also do sensing.

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Publicly traded in 2007, but only pivoted to quantum computing much later.
The co-founder's name, Toby Cubitt, is the mos awesome thing ever (Cubitt -> qubit). From UCL.

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