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But today both Match Group - the IAC-owned parent company that owns Tinder and OkCupid - and mobile payments company Square went public.
Both finished up from their filing prices - Match ended the day up 22%, while Square finished up 45%.
The recent pickup in tech IPO activity got us thinking. If you had invested $10,000 in the biggest tech companies before they went public, how much would your shares be worth now?
We crunched the numbers and figured it out. (Note that this doesn't include dividend payments, which in a lot of cases would have made you even richer.)