Who Hosts the Y Combinator Startups?

Every couple of months I re-evaluate my hosting choices to ensure they still makes sense in terms of cost, stability and service. Curious as to what choices other technology companies are making, I decided to conduct an independent survey of who hosts the Y Combinator-funded startups. Armed with only this spreadsheet listing the over 300 websites, my terminal and nslookup, I compiled this graph:

In all, I found 289 websites that weren’t dead or merged into another company’s website. Almost 3/4 of all sites were hosted by Amazon, Rackspace, Softlayer or Linode.