SoftBank, which previously backed ACV's 2016 series A round, returned for a series C that boosted the car auction platform's overall funding to $53m.

ACV Auctions, the US-based operator of an online used vehicle auction platform raised $31m in a series C round yesterday featuring SoftBank NY, a subsidiary of telecommunications and internet group SoftBank.

The round was led by Bessemer Venture Partners and included fellow venture capital firm Tribeca Ventures and VC fund Armory Square Ventures.

Founded in 2014, ACV Auctions operates a platform for car dealers to sell and buy used vehicles through a 20-minute auction process. It is currently active across 35…