Is the adtech stock's run-up over?Cathie Wood has become a popular investment manager to watch. She invests in disruptive tech stocks through her company, Ark Invest, and the exchange-traded funds (ETFs) it sells.Last week, Ark sold shares of adtech company The Trade Desk (TTD -0.65%). Should investors follow suit?All about The Trade DeskThe Trade Desk is a digital platform that connects advertisers and media outlets. It's really as simple as that, although it uses artificial intelligence (AI) and top techn ...