One tech stock that has absolutely skyrocketed this year is The Trade Desk (NASDAQ: TTD). Year to date, shares of the advertising technology company are up a 66%. This absolutely obliterates the S&P 500's 12% gain during this same period. Have investors in the growth stock become overly exuberant? Or, on the contrary, is there some substance behind this soaring stock?

A close look at the stock and (more importantly) the underlying business, reveals that it may make sense for investors to keep holding the stock -- particularly those sitting on huge capital gains.

But first, some backstory.

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Source Fool.com