Mitsubishi UFJ Financial Group Inc. and Nomura Holdings Inc. are among Japanese financial companies being forced to tighten marketing of mutual funds as a law to protect individual investors comes into effect next week.

Regulators in the world's second-biggest securities market will require clearer disclosure of risks when selling funds to protect individual investors. The law is Japan's first effort at integrating regulations of all types of financial investments, including those by hedge funds.

The Financial Instruments and Exchange Law takes effect on Sunday, and is part of the government's drive to offer greater investor protection after several financial scandals. It comes as Nomura, Japan's biggest securities firm, and Daiwa Securities Group Inc. posted better than expected first quarter earnings on higher sales of funds.