Castle Island Partners

Castle Island Partners does not operate with a traditional PE fund structure. The firm invests its principals' own family capital over extended periods, targeting holds of 10-plus years. This permanent capital model removes the fixed investment horizons driven by internal fund dynamics, allowing for a longer-term operational approach to value creation.

The firm acquires controlling stakes in closely-held middle market companies focused on industrial manufacturing, distribution, and services. It targets US-based businesses where the partners' direct operating experience — having run companies from $10 million to $1 billion in revenue — can be applied to help them scale.

Castle Island Partners deploys the capital of its founding principals' families. The firm explicitly states it is not a traditional fund structure and does not manage third-party limited partner capital, which underpins its ability to hold investments for 10 years or longer.

The firm executes buyout, growth, recapitalization, restructuring, and turnaround strategies. Its approach is grounded in the operating experience of its partners and a strategy toolkit derived from their prior experiences at firms including Bain Capital, Parthenon Capital, and Berkshire Partners.

The firm's stated focus is exclusively on US-based businesses within industrial manufacturing, distribution, and services. There is no public indication of an international acquisition strategy.