Opendoor, which has already raised billions to buy homes over the internet, just landed another large investor: the SoftBank Vision Fund.

The fund, part of SoftBank Group Corp., is investing $400 million in Opendoor, whose flagship service uses home-pricing algorithms to make rapid, all-cash offers to sellers, charging a fee for simplifying the selling process.

The new investment values the company at more than $2 billion, according to a source with knowledge of the matter, who asked not to be named because it is private.