The two companies have found strong potential demand for securities transactions among Credit Saison's 16 million customers, the paper said. The project is likely to start this year.
Credit Saison plans to focus on offering investments that are paid for in monthly instalments, the article said.
Monex Inc, in the red for four years after its 1999 start-up, reported a record quarterly profit earlier this month, thanks to solid market turnover and Japanese investors' growing enthusiasm for doing deals over the Internet.