As of June 2013, Yoshiaki Tsutsumi remains a major investor in Seibu Holdings through his 36% investment in NW Corporation, the second-largest shareholder in the company with a share of around 15%.
Pada bulan Juni 2013, Yoshiaki Tsutsumi tetap menjadi pemegang saham utama di Seibu Holdings dengan investasinya sebesar 36% di NW Corporation, pemegang saham kedua terbesar di perusahaan dengan jumlah sekitar 15%.