What do the world's most successful investors do when their favorite stocks get beaten down? If your name's Cathie Wood and Zoom Video Communications (NASDAQ: ZM) is the stock getting hammered, you buy a lot more.

On Tuesday, Aug. 23, while Zoom's stock price was tanking, ARK Invest added a combined 839,000 shares to the ARK Innovation ETF and ARK Next Generation Internet ETF. Now Zoom is ARK Invest's third-largest holding. 

Just looking at the headline numbers, it's easy to see why the stock slid more than 16% in a day. Below the surface, though, there were some signs of success that encouraged Wood to buy heaps more shares to hold for the long run.

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Source Fool.com