Following the trades of large firms can be a smart investing strategy. Not that anyone should blindly follow, but seeing where they think the market could move can provide insights into what you should be doing.

Many people have done this with Warren Buffett's trades at Berkshire Hathaway for years, but they only reveal their trades once every quarter in a 13F document. Cathie Wood and Ark Invest don't follow those same guidelines; they post their daily trades on their website. This allows us to see what they're doing in real time, and they've recently made some big moves in The Trade Desk (NASDAQ: TTD) stock.

Since Nov. 10, Ark Invest (in its various funds) has purchased 1.42 million shares of The Trade Desk. At today's prices, that's worth about $107 million. So, what happened around Nov. 10 that triggered Ark's buying spree? The Trade Desk's earnings report was released on the evening of the Nov. 9.

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Source Fool.com