Castle Island Partners

Castle Island Partners is a Boston-area private investment firm founded in 2006 that acquires controlling or meaningful stakes in middle-market industrial, consumer, and service businesses. The firm partners with company management to provide strategic guidance, operational expertise, and long-term capital, typically targeting businesses with established earnings and recurring demand. Its approach emphasizes extended ownership horizons and collaboration with family offices or institutions on larger transactions. Castle Island’s investment activity spans consumer products and retail, distribution and logistics, manufacturing, and business services across the United States and Canada. The firm seeks to support growth, operational improvement, and strategic execution in portfolio companies.