The Mitsui and Qihoo 360-backed nanosatellite company took its overall funding past $80m with a Promus Ventures-led series B round.

Spire, a US-based nanosatellite developer backed by cybersecurity company Qihoo 360 and diversified conglomerate Mitsui, has raised $40m in a series B round led by Promus Ventures.

Promus was joined by Bessemer Venture Partners, Jump Capital, RRE Ventures and Lemnos Labs. Spire will use the round to fund the mass production of its nanosatellites, which are filled with software-radio technology that can produce reams of data by listening instead of looking.

Spire raised $25m in a July 2014 series…