Citi Ventures and existing backer Slack Fund helped the communications API provider take its overall funding to more than $55m.

US-based communications software provider Nylas secured $25m on Tuesday in a series B round featuring Slack Fund and Citi Ventures, representing messaging platform developer Slack and financial services group Citi respectively.

Venture capital firm 8VC and VC fund Round13 Capital co-led the round, which included Spark Capital and ScaleUp and which boosted the company’s overall funding to about $55m.

Nylas provides application programming interfaces (APIs) that enable app developers to connect their products to any calendar, email or contacts provider…

Robert Lavine

Robert Lavine is special features editor for Global Venturing.