IBM is a quantum monster
Out of the 67 quantum processors existing in 2023 so far, IBM makes 34 of them, so half of all the model types in existence. It therefore follows that IBM is #1 on the list of quantum companies.
Microsoft is #3 on that list, following Google. The first two have their own quantum processors. Microsoft has none to its name (yet), so that means it's buying from someone - and there's an even chance that that means IBM.
I had no idea that IBM was so into quantum computing. Must explain why I've been feeling like it disappeared from the IT landscape for the past decade . . .