Mizuho Capital Partners Co. plans to make its first investment for a fund that invests in mezzanine securities by the end of September as it targets Japanese pension funds looking to boost returns.

Mizuho Capital, a unit of Mizuho Holdings Inc., started a ¥12.1 billion fund last month and aims to eventually raise as much as ¥30 billion, Managing Director Tadashi Miyazaki said. It's currently looking at mezzanine debt by a sports-related company and a temporary staff service provider as potential investments, Miyazaki said, declining to name the firms.

The fund is Mizuho Capital's second to invest in Japanese companies' mezzanine debt, which is a type of leveraged loan repaid after senior loans in a default.