For long-term investors, the preferred holding period for a company is forever. However, that's not always realistic, and there comes a time when investors must sell a stock (or at least some portion of the holding).

There are multiple reasons to sell a stock, such as a thesis change or business problem, but neither of those are the reasons I decided to sell some shares of The Trade Desk (NASDAQ: TTD) recently. Read on to find out why I sold some shares but still believe in The Trade Desk as a company.

The Trade Desk operates in the advertising market and is a platform advertisers use to bid on ad spaces. It operates in multiple locations: connected TV, podcasts, smartphones, the internet, and just about every other place you'd see a digital ad.

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Source Fool.com