Sony Corp. on Monday established a preparatory company jointly with Oki Matsumoto, a limited partner at Goldman Sachs & Co. of the United States, to enter the Internet securities business, Sony officials said.

Both parties invested 25 million yen apiece to buy 50 percent stakes in Monex Inc.

The purpose of Sony's capital participation is to acquire knowhow for electronic transactions on networks, Sony officials said. The new firm will go into full operation after October, when stock trading commissions are scheduled to be fully liberalized.

Monex has four board directors, two of which are from Sony. Matsumoto serves as chief executive officer.