Northwestern Mutual Future Ventures contributed to a series B round that Chime will use to increase the features on its mobile banking app.

US-based mobile banking platform Chime secured $18m on Wednesday in a series B round featuring Northwestern Mutual Future Ventures, the corporate venture capital subsidiary of insurance firm Northwestern Mutual.

Cathay Innovation, a VC fund managed by private equity firm Cathay Capital, led the round, which included Crosslink Capital, Aspect Ventures, Forerunner Ventures, Homebrew and Omidyar Network.

Founded in 2013, Chime provides customers with fee-free banking through a mobile app and a Visa debit card. It makes money through merchant fees…