Thank you for the list.

Going quickly through the companies there:

   - Rackspace was sold to private equity and restructured and made public a second time.
   - LogMeIn was sold to private equity
   - Kaplan is part of bigger company
   - Ultimate software merged with Kronos
   - Shutterfly was acquired by private equity
   - Wirecard is a scam.
   - Grubhub is going to be acquired by a bigger competitor
   - Travelport, Expedia and Bookings are 3 very similar companies which bought all the smaller competitors.

Also note that these are internet companies and do no include myriad other software companies, including enterprise tech. So I am not sure if I agree with your concern on tech being reduced to 5-10 big companies.