Udaan, an Indian business-to-business (B2B) online marketplace, has secured $373.5 million from new and existing investors in an ongoing Series D financing round.

Udaan raised the money from Altimeter Capital, GGV Capital and Hillhouse Capital, as well as existing backers, DST Global and Lightspeed Venture Partners.

The new investment round more than doubles the startup’s valuation to $2.3 billion.

In September 2018, Udaan had secured $225 million in a financing round, which valued the startup at $1 billion.