KDDI will pay 559 yen per Kabu.com share, a 4.68 percent premium over Friday's closing price, the company said, acquiring a minority stake in the online brokerage, a unit of Mitsubishi UFJ Financial Group Inc (MUFG).

KDDI is bolstering its range of financial services, partnering Daiwa Securities Group Inc to provide asset management via smartphones.

KDDI also said it would raise its stake in Jibun Bank, a 50:50 joint venture with MUFG's banking unit, to 63.78 percent.

(Reporting by Chang-Ran Kim; Editing by Muralikumar Anantharaman)