SoftBank Group Corp-backed Coupang was valued at around $109 billion in its market debut on Thursday after South Korea’s largest e-commerce company raised around $4.6 billion in the biggest U.S. initial public offering this year.

Coupang’s stock soared 81% to open at $63.50. The company had priced 130 million shares sold in the IPO at $35 per share, higher than the marketing range $32-$34 per share, giving the Seoul-headquartered e-commerce giant a market value of $60 billion.

Founded in 2010 by Korean-American billionaire Bom Suk Kim, Coupang rose to prominence after launching its guaranteed same-day or next-day delivery service in the East Asian country. SoftBank’s $100 billion Vision Fund owns 35.1% of Coupang.

The IPO is the biggest in the United States this year, surpassing the $2.15 billion raised by dating app Bumble Inc. It also marks a jump in Coupang’s valuation, which was pegged at $9 billion in a fundraising round in 2018, according to Pitchbook.

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