Stanley Druckenmiller and his Duquesne Family Office has been a great hedge fund for investors to track. In the fourth quarter, Druckenmiller opened a new position in Amazon (NASDAQ: AMZN). Prior to the fourth quarter,

Stanley Druckenmiller likes to make big bets. He once said that if you see something really exciting, “bet the ranch on it.” Druckenmiller was formerly George Soros's right-hand man. He helped make the famous bet against the British pound in 1992,

Altogether, Druckenmiller held 74 different U.S. common stocks at year-end, the most ever in a quarter since he began filing on behalf of his family office nearly a decade ago. The common stock portfolio was valued at $3.55 billion at year-end, the highest amount in four quarters.

Of course, copying every move of every billionaire investor is impossible. One particular billionaire to watch is Stanley Druckenmiller, the investor who led Duquesne Capital Management to an average annual return of 30% without any money-losing year over a period of 30 years.

You can say many things about former hedge fund manager Stanley Druckenmiller, including that he is a billionaire, investor, and philanthropist. Druckenmiller has a long history of market success, and with an estimated net worth of around $6.

Billionaire Investor Stanley Druckenmiller is among the best investors of all time. During the fourth quarter, Druckenmiller swapped some of his holdings in the "Magnificent Seven" for other stocks in the elite group.

Warren Buffett once told shareholders,  “The worst sort of business is one that grows rapidly, requires significant capital to engender the growth, and then earns little or no money. Think airlines.” He continued,