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Through today, 111 initial public offerings have taken place in the United States this year, making 2014 the busiest year for the IPO market since the "Dot-Com" era of 1999 through 2001.

While the size of the 2014 IPO market is huge, the deals are just getting started.

There are still some big profit opportunities awaiting 2014’s initial public offering investors, including what may be one of the biggest IPOs of all time. Here are some of 2014’s biggest upcoming IPOs…