South Korean e-commerce giant Coupang, which soared in its Wall Street debut, got early backing from a couple high-profile investors: Stanley Druckenmiller and Bill Ackman.

Coupang, dubbed the Amazon of South Korea, nearly doubled from its initial public offering price of $35 per share shortly after Thursday's midday open on the New York Stock Exchange.

The stock later pared those gains, but it was still up around 50% for a market value of $90 billion.

Druckenmiller, the billionaire CEO of the Duquesne Family Office, has been a longtime, pre-IPO investor in the Seoul-based company, Kevin Warsh, an advisor to Druckenmiller, told CNBC's Becky Quick. Warsh, a former Federal Reserve governor, joined the board of Coupang in 2019. Warsh owns a total 280,662 shares of Coupang, according to a filing with the Securities and Exchange Commission.

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