Not all private tech companies are created equal. You only have to name the first few that pop into your head to realize this: Square [3], ZocDoc [4], Fab [5], and Evernote [6]. But there's one thing they all have in common: They're enormously valuable. And according to a new report [7] titled "The Tech IPO Pipeline," from CB Insights, companies with valuations above $100 million--including all those listed above--can be surprisingly similar. Here are some highlights from the report, which identified trends across 472 tech companies:

• The pipeline companies have raised a combined $40 billion to date.
• The average amount of funding one of these companies raises is $84.7 million.
• Sequoia Capital and Intel Capital lead the top 10 investors, based on the number of companies they've invested in.
• Unsurprisingly, California is home to nearly 50% of these companies. Surprisingly, New York and Massachusetts are in a dead heat for second place, with Texas, Washington, and Florida rounding out the top five.
• Most companies first started raising financing in 2007. But four of the pipeline companies first started financing in 1998.