“Our foremost priority is to continue defending our leadership in Line's dominant markets — Japan, Taiwan, Indonesia and Thailand, where we believe lie great opportunities and growth potential,” Lee told reporters at Naver’s Data Center “GAK” in Chuncheon, Gangwon Province.

Line offers free messaging and voice call services for some 218 million monthly active users, mostly in Asia. It profits by selling digital stickers and games on the app as well as advertising — which led the firm to rack up more than $1 billion in revenue last year.

Using the new capital from the IPO, Line is looking to develop services that can add new value to the app as well as explore appealing technologies that would allow the firm to venture out of its Asian strongholds and into new markets in the West, Lee said.

“As it will be difficult to compete on the mobile messenger business in Europe and the U.S., markets to which we want to expand, we will make bold investment into new technologies to create new business areas to excel in,” Lee said.

Calling the Line IPO a “bold step toward greater change,” Lee said Naver has gained significant leeway to make more aggressive investment into new, promising technologies that can survive the competition and win over users around the world.

“The biggest difficulty is that foreign IT giants possess immense capital which they can use to invest in a wide range industries, while we have significantly less capital to work with and must carefully decide where to focus our investments,” he said.

Naver plans to concentrate on advancing the new technologies being developed by its own engineers, as well as invest in startups that possess standout technologies that can improve its existing services as well as build new ones, Lee said.

“We want to invest in startups with strong technologies and lots of bright engineers,” the Naver chief said. “Naver possesses the right infrastructure, capital and networks in launching such startups to overseas markets.”

Line’s dual listing in Japan and the U.S. has also put the company in a better position to pursue global expansion and strategic M&As abroad, by lifting the company’s brand value on a more global scale, Lee said.

Driven by high investor demand, Line shares on the Tokyo Stock Exchange closed at 4,345 yen ($41) on Friday, up 32 percent from its initial offering price of 3,300 yen, giving the company a market valuation of about 900 billion yen ($8.5 billion).

A day earlier in the U.S., Line’s shares had closed at $41.58 on the New York Stock Exchange, surging 27 percent above the IPO price of $32.84 and raising the firm’s market value to about $8.7 billion.

Line has sold 35 million shares of stock -- split between 22 million American depository receipt shares listed in New York and 13 million shares listed in Tokyo. Following the IPO, Naver now controls approxiately 83.3 percent of Line’s stocks.

By Sohn Ji-young (jys@heraldcorp.com)