through his holding company Kokudo Corporation. After gaining control of Seibu, Kokudo developed the Prince Hotels chain, acquired the baseball team now known as the Saitama Seibu Lions, in addition to continuing its core real estate business throughout the Tokyo area. Seibu Railway had its initial public offering on the Tokyo Stock Exchange in 1949 but remained under the control of Tsutsumi through Kokudo. Station numbering was introduced on all Seibu Railway lines during fiscal 2012. Delisting and takeover struggle Tsutsumi registered Seibu Railway shares owned by Kokudo in the names of various affiliated individuals, often without their permission, so that the true ownership of the company was not readily apparent. Following the death of Tsutsumi in 1964, his third son Yoshiaki Tsutsumi inherited control of Kokudo and continued the practice of falsifying shareholder records. His holdings in Kokudo and Seibu led to his being deemed the "world's richest man" by Forbes magazine for four consecutive years from 1987 to 1990, with estimated net worth of $15–20 billion during the height of the Japanese asset bubble. He was arrested on securities fraud charges in March 2005. On December 21, 2005, Seibu Railway was delisted from the Tokyo Stock Exchange. A reorganization of the group, completed in February 2006, created Seibu Holdings to act as a holding company for both the railway and Prince Hotels. Cerberus Capital Management, an American investment fund, became the largest shareholder in Seibu Holdings with a 29.9% share of the new company. In late 2012 and early 2013, Cerberus proposed that Seibu Railway abolish five non-core lines, along with other restructuring measures throughout the Seibu Holdings group, but management refused to implement these changes. Cerberus then executed a tender offer to increase its stake to 35% as of June 2013, giving Cerberus the power to veto shareholder resolutions. Cerberus had aimed to raise its stake to 44%, bringing it closer to an outright majority, but Seibu management engaged in a massive campaign to thwart the tender offer, including advertising within Seibu trains to passengers who owned stock. The East Japan Railway Company and several financial institutions also planned a support scheme to keep Cerberus from acquiring control of Seibu, but it was ultimately not implemented due to a lack of potential financial benefit for the investors. At the June 2013 shareholder meeting, several proposals by Cerberus were voted down, including the election of outside directors and