The stock of Coupang, a start-up in South Korea that is sometimes called the Amazon of South Korea, drifted after trading publicly for the first time in New York on Thursday.

Coupang — the company’s name is a mix of the English word “coupon” and “pang,” the Korean sound for hitting the jackpot — was founded by a Harvard Business School dropout and has shaken up shopping in South Korea, an industry long dominated by huge, button-down conglomerates.

The initial public offering raised $4.6 billion and valued Coupang at about $85 billion, the second-largest American tally for an Asian company after Alibaba Group of China in 2014. Coupang’s shares rose 6.6 percent on Friday as trading began, but fluctuated throughout the morning.

Coupang is South Korea’s biggest e-commerce retailer, its status further cemented by people stuck at home during the pandemic and those in the country who crave faster delivery. In a country where people are obsessed with “ppalli ppalli,” or getting things done quickly, Coupang has become a household name by offering “next-day” and even “same-day” and “dawn” delivery of groceries and millions of other items at no extra charge.