Activist short-seller Glaucus Research Group says it's planning to target Japan Inc.

The U.S.-based investor is investigating a couple of Japanese companies and plans to publish reports on them in about four or five weeks, Soren Aandahl, director of research, said in an interview in Tokyo, declining to name them. Glaucus has hired a Japanese analyst to help with its push into the market.

Japan has been calling for more engaged investors under Prime Minister Shinzo Abe, who has instituted codes for shareholders and companies to get them to work more closely together. While that's led to some recent high-profile cases of traditional hedge fund activism,. including by Daniel Loeb, short-sellers who disclose their activities have been thin on the ground.