[Cthulhu_]

Look for the phrase "scale-up" instead of "start-up", these are usually well-funded, up-and-running companies that still have some of the start-up mentality but without the financial worries.

Of course, some of these are already a decade old and may employ hundreds or thousands of people already, so YMMV; they might just be like older, boring enterprises, just not as formal or fixed in their ways.

[solarmist]

Those are companies that believe they have product market fit though. At that point they are starting to transform from a startup into an established company.

So most of the early stage learnings can no longer happen.