Baron Koyata Iwasaki was a Japanese industrialist who served as the fourth and last president of the unified Mitsubishi.

[1] He was the last person to hold the office before the Allied Occupation Forces ordered the dissolusion of all major zaibatsu.

He spun off each department into a subsidiary, covering sectors such as mining, shipbuilding, banking, trading, and real estate.

[3] Under his leadership, Mitsubishi enjoyed de facto monopolies or oligopolies in many of these sectors.

To further expand the group, he sold nearly half of the shares of these subsidiaries to the public, while Mitsubishi headquarters, led by him, owned the rest.