Seibu Railway had its initial public offering on the Tokyo Stock Exchange in 1957 but remained under the control of Tsutsumi and Kokudo; following the death of Tsutsumi in 1964, his third son Yoshiaki Tsutsumi became head of the Seibu group.
Seibu Railway had its initial public offering on the Tokyo Stock Exchange in 1957. Seibu Railway remained under the control of Tsutsumi and Kokudo. His third son Yoshiaki Tsutsumi became head of the Seibu group. This was following the death of Tsutsumi in 1964.