SoftBank has made its third investment in X.ai, which is developing an electronic personal assistant that can schedule meetings, bringing its overall funding to almost $35m.

US-based artificial intelligence technology developer X.ai raised $23m on Thursday in a series B round featuring telecommunications and internet company SoftBank, which invested through its SBNY unit.

Two Sigma Ventures, the venture capital arm of investment manager Two Sigma Investments, led the round, which also included DCM Ventures, Work-Bench Ventures, IA Ventures, Firstmark Capital, Lerer Hippeau Ventures, CrunchFund and Pritzker Group Venture Capital.

Founded in 2014, X.ai is working on an AI-based electronic personal assistant called Amy, currently in beta,…