SoftBank Group is considering audacious fundraising plans, including a public offering of its $100bn investment fund and the launch of a second fund of at least that size, as it looks to seize on an exploding startup scene, people familiar with the matter said.

More immediately, SoftBank is negotiating with the sultanate of Oman for an investment of several billion dollars in its existing $100bn Vision Fund, which raised nearly all its cash from Saudi Arabia and Abu Dhabi, the people said.