I followed the links to each startup's site. If they didn't provide an address on the site, I checked their whois. If that was private, then I didn't add them

I followed the links to each startup's site. If they didn't provide an address on the site, I checked their whois. If that was private, then I didn't add them to the map. So there are definitely a few that didn't make the cut because they're being extra stealthy.