Cathie Wood is always making moves, and the primary decision maker for the Ark Invest family of exchange-traded funds (ETFs) makes it easy to play along. She publishers her firm's purchases and divestitures a couple of hours after the end of the trading day. What is she buying these days?

Wood added to her existing positions in Joby Aviation (NYSE: JOBY), Coinbase Global (NASDAQ: COIN), and Block (NYSE: SQ) on Monday. Let's look at the stocks she bought earlier this week.

You might not realize it, but there are at least three publicly traded companies specializing in air-taxi services. Spoiler alert: Wood happens to own all three of the leading players. Joby Aviation is the largest of the players by market cap, commanding more than double the market cap of its two peers combined. 

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Source Fool.com