Shares of small Japanese shippers jumped last week after the historic summit between U.S. President Donald Trump and North Korean leader Kim Jong Un sparked hopes of new business ties with the reclusive country.

Japanese retail investors are snatching up shares of the firms that may benefit from a potential thaw between Tokyo and Pyongyang, even though the Japanese government has been a staunch supporter of "maximum pressure" on North Korea.

Shares of Rinko Corp., a marine transportation company, jumped 17 percent last week with the heaviest trading volume in more than two years.