The combined market cap of the top 10 Korean firms fell by about 11 trillion won ($9.45 billion) during the first five months of 2016.
According to financial information provider FnGuide, the market cap of the country’s top 10 listed conglomerates declined to 633.91 trillion won as of June 3, losing 1.7 percent from the amount it reported at the end of 2015.
Among the leading local companies, Samsung Group lost 1.86 percent of market cap after dropping to 296.92 trillion won from 302.64 trillion won.
Samsung saw the biggest drop among the ten firms, followed by LG, Hyundai Motor, Hanwha, SK, Hanjin and Lotte.
During the period, POSCO gained the most, as its market cap surged 4.95 trillion won. Hyundai Heavy Industries and GS gained 2.29 trillion won and 853 billion won, respectively.
The benchmark KOSPI had risen by 1.25 percent to 1,985.84 on June 3 from 1,961.31 points on Dec. 30 in 2015.