Sean O’Sullivan, the founder of the global venture outfit SOSV, has slowly but steadily built up a sizable operation over the years.

SOSV started off as a family office, investing the capital of O’Sullivan after he co-founded two companies, including MapInfo, an outfit that went public in 1994 before Pitney Bowes acquired it years later, in 2007. The seed-stage investing outfit has since raised three more funds, including a $277 million early-stage fund that it closed in 2019 and is actively investing from right now.

Now, to complement those funds, the organization has raised $100 million for what it’s calling a “select fund” that’s meant to help SOSV maintain its pro rata stake in some of its breakaway portfolio companies.