The combined market cap of Naver and Kakao have fallen by nearly 19 trillion won just in two days amid moves by the financial authorities and ruling Democratic Party to regulate dominant online platform operators. 

According to the KRX, the share price of Kakao, the nation’s largest mobile messenger operator, dropped six-point-14 percent on Thursday to close at 130-thousand won. The nation's No. 1 portal service operator Naver also saw its stock price dive two-point-56 percent on the day to fall below 400-thousand won for the first time in nearly two months. 

This follows the respective tumble of 10-point-06 percent and seven-point-87 percent in the company shares on Wednesday. 

The sharp declines came after the Financial Services Commission said on Tuesday that there is a possibility that Kakao Pay and Naver Financial violated the financial consumer protection act through their online product sales. 

The main ruling DP is also moving to limit the market dominance of such platform operators and seeking to push relevant legislation through parliament.