New Delhi, July 11 -- Shares of South Korean memory chipmaker SK Hynix rose 12.8% as they made their debut on Wall Street on Friday.

The company is already one of the largest in South Korea, along with Samsung Electronics, and is a member of the Kospi index. Even with a recent pullback, the country's Kospi index is up 77% so far this year and SK Hynix shares have more than tripled.

SK Hynix priced its American depositary receipts, or ADRs, at $149 each Thursday. They opened Friday at $170 and closed at $168.01. The offering of 177.9 million ADRs raised proceeds of $26.5 billion, making it the biggest-ever initial share sale in the U.S. by a foreign company. (An ADR is issued by a bank or broker and is a simplified way for US investors t...