By bno – Taipei Office The Japanese government is aiming for a substantial valuation of JPY700bn (about $4.7bn) for the Tokyo Metro as preparations for its initial public offering (IPO) ramp up. This move could position Tokyo Metro’s listing as the largest IPO in Japan in nearly six years, with plans to launch as early as late October, according to multiple sources familiar with the matter, Reuters reports. The listing, which would involve selling 50% of Tokyo Metro’s shares, could raise approximately JPY350bn, surpassing the previous record set by Kokusai Electric’s IPO last year and challeng…