Customers of Kakao Pay Securities are now able to purchase Korean and U.S. stocks through KakaoTalk, Korea's most frequently used mobile messenger app. The brokerage subsidiary of Kakao conglomerate announced Tuesday that the stock trading service became available on KakaoTalk earlier that day. The stock brokerage service allows customers to place orders on the Korean stock markets, as well as pre-markets, regular trading sessions and after-markets of the U.S. stock markets.