Unimat Holding said Monday it will purchase a 77.41 percent stake in midsize brokerage Yamamaru Securities Co. from the brokerage's biggest shareholder.

Unimat Holding said it will buy 6.78 million shares in Yamamaru Securities from Shinobu Osako, former president of Zenrin Co.

Unimat Holding has been diversifying its business operations. It has Unimat Offisco Corp., an office coffee service provider, under its umbrella.