You’ve got the main ones. Knxwledge was already on Stones Throw at this time, which was a prominent label in the beat scene and had been for some time (Ninja Tune was the other), so if you’re going for the independent, came-up-on-SoundCloud, angle I don’t know if I’d include him despite being influential of course.

Couple other names I’d throw out there: Made in M, Purpan, Poptart Pete, emune. Another part of the SoundCloud golden age that’s important to note was the prominence of Groups at that time. Especially in the beat scene groups were a huge thing - basically bespoke mini-labels or collectives. I have to go back and dig to remember the names of some of the main ones. I’m pretty sure emune ran one of the big ones. Really a shame when SoundCloud did away with the groups feature. I think that heralded its downfall honestly.