Simon Mahony is an exited founder who focuses specifically on B2B SaaS and data companies at Socii Capital, a narrower lane than the healthcare and broader tech remits held by other partners, and he continues to run companies himself, serving as CEO of FDB Systems since 2019 and being tied to Kinalta Group, a holding company owned and operated by his family. Based in London, he anchors part of Socii’s presence on the UK side of the firm’s San Francisco–London footprint, and he’s one of the named partners linked to breakout portfolio companies like Revolut.