There are a couple of different lists. The first is the list of accelerators, which I update as soon as I learn about a new accelerator. (Often I add it before they've funded any companies.)
The next list is the list of startups for each accelerator. This is a pretty manual process, though I do give admin permission to accelerators to go in and add their startups themselves. I suspect for the accelerator you're thinking either a) I don't have their full list of startups and/or b) the startups that have exited aren't marked as such on Crunchbase.
You're correct that for many acquisitions I do have to make guesses about exit value; I clearly mark each exit value on Seed-DB with a H/M/L icon to indicate my level of confidence in the value. (Where people have come to me afterward my guesses have been roughly 50/50 over/under.)
I've got some ideas about calculating a valuation, but even if I put that together I would likely not make it public since it's just guesses multiplied by guesses. Plus, there are companies that just buck trends in trying to guess valuation based on funding signals... my favorite example here is Weebly. They went for 4 years on ~$600k of funding before raising a monster $45million round.
The next list is the list of startups for each accelerator. This is a pretty manual process, though I do give admin permission to accelerators to go in and add their startups themselves. I suspect for the accelerator you're thinking either a) I don't have their full list of startups and/or b) the startups that have exited aren't marked as such on Crunchbase.
You're correct that for many acquisitions I do have to make guesses about exit value; I clearly mark each exit value on Seed-DB with a H/M/L icon to indicate my level of confidence in the value. (Where people have come to me afterward my guesses have been roughly 50/50 over/under.)
I've got some ideas about calculating a valuation, but even if I put that together I would likely not make it public since it's just guesses multiplied by guesses. Plus, there are companies that just buck trends in trying to guess valuation based on funding signals... my favorite example here is Weebly. They went for 4 years on ~$600k of funding before raising a monster $45million round.