What features of democracy are you concerned with? It’s not hard to find employee-owned and/or cooperatives.

CHS, Inc up here in St. Paul does almost 40 billion in revenue as a cooperative.

CHS Inc is about as democratic as McDonalds. The farmers can vote, just as McDonald's shareholders can, but I'd bet that the Hispanic laborers they rely on have less of a say over their working conditions than McDonald's workers.

There are many worker coops that operate as a democracy, some of them quite large. From manufacturing to food service to coding to agriculture, they are in nearly every sector.

Maybe this is news to you, but the arrangement isn't that uncommon.

Not the person to whom you were responding but lets refine the question: can you name one at the size and scale of Telsa or SpaceX?

Mondragon has tens of billions in revenue and nearly a hundred thousand workers. https://en.m.wikipedia.org/wiki/Mondragon_Corporation

Is that Tesla or SpaceX scale? Seems like it's in the ballpark.

John Lewis [1] springs to mind, although I don't know how deep that runs.

[1] - https://www.johnlewispartnership.co.uk/about.html