Bill Ackman is one of the highest-profile billionaire investors today. When he puts money to work, the market pays attention.

Right now, he's betting $1.4 billion -- roughly 13% of his entire portfolio -- on a single stock. This stock is unknown by most, and misunderstood by many. It takes a little digging into, but there's a reason Ackman is willing to risk a ton of capital on its future.

Ackman's pick has a familiar name, but the vast majority of investors can't say what it does. The company is Howard Hughes Holdings (NYSE: HHH), named after American aerospace engineer and billionaire business magnate Howard Hughes.

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Source Fool.com