Investors are a pretty big signal for this. For example startups that raised money from YC is pretty much guaranteed to be successful.
The list only includes companies that have reported, I'm sure many others just silently die, or barely keep operating.
Another reason investment doesn't equal success, look at Pebble, $63m investment, acquired for $23m. How much of that acquisition money do you think went to employees.
Not to pick on Pebble, if your definition of success is shipping a product people love, that defines a new industry, and that you can be proud to have worked on, I'm sure that ticked all the boxes, but from a monetary standpoint, it was not a winner.