Tokyo prosecutors arrested four executives of Daiwa Securities Co. on Tuesday for allegedly compensating a "sokaiya" corporate extortionist for investment losses in violation of the Commercial Code and the Securities and Exchange Law.

The arrests complete the circle of Big Four brokerage arrests stemming from one sokaiya, Ryuichi Koike. The Daiwa Securities executives are suspected of compensating Koike to the tune of 203 million yen from Jan. 9 to Dec. 21, 1995, through two accounts, one in the name of a firm run by the racketeer's brother and the other under the name of a friend.

Those arrested were identified as former general affairs department managers Yasuo Terashima, 60, Soichi Tada, 51, and Naoyoshi Kito, 60; and 54-year-old Nobuhiro Kaneda, manager of the investment equities department.