Nautic Partners has announced it received a strategic investment from Blackstone GP Stakes.

Nautic, based in Providence, R.I., is a middle market private equity firm focused on investments in healthcare and a few other sectors. The firm prefers to make $50 million to $400 million-plus equity commitments in a variety of growth, consolidation and buyout opportunities of North American companies with enterprise values from $100 million to $1 billion and more.

Blackstone GP Stakes pursue long-term, minority investments in the management companies of private equity firms. Two funds comprise Blackstone‘s GP Stakes strategy: Blackstone Strategic Capital Holdings I and II.

Terms of the investment were not disclosed.