Selected prior investments





Milestek corporation
(mil/aero cable assemblies/connectors)



Leading value added distributor of custom cable assemblies and connectors used in MIL-1553B applications, as well as a range of other commercial and industrial connectivity products. Exited 2012.


micorp dealer services
(b2b automotive installation services)



Regional provider of installation services for electronic and luxury automotive accessories, primarily marketed via large auto dealers in New England but also offered direct to consumer at its service locations. Exited 2016.



spoondance creamery
(yogurt and buffalo mozarella)



Manufacturer of branded yogurt and buffalo mozzarella cheese sold to restaurants and retailers nationwide. Exited 2010. ​



Interline brands
(Mro wholesale distribution)



National distributor of plumbing, HVAC, cleaning and electrical products to residential and commercial property managers and operators
Parthenon Capital portfolio company sold to Home Depot Supply



hmt
(Industrial tank installation and repair)



Manufacturer and maintenance repair service provider of above ground storage tanks.
Berkshire Partners portfolio company sold to Tailwind Capital.



restaurant technologies inc
(cooking Oil Value added distribution)



Route based value-added distributor and logistics service provider for cooking oil to fast food and full service restaurant chains in the United States.
Parthenon Capital portfolio company sold to EQT Infrastructure Partners.



Castle Island partners llc



2020 Commonwealth avenue, suite 100 newton ma 02466




Castle Island Partners has been investing in industrial and consumer businesses since our founding in 2006. We are now exclusively focused on industrial manufacturing, distribution and service businesses with EBITDA between $750k and $10 million. At the lower of this size range, we are principally buying for our own accounts, whereas for larger deals we partner with large family offices and institutions, with whom we have collaborated in the past. We typically buy a controlling stake but are open to minority investments in companies where we have a material say and economic stake in the partnership. Our objective is to own businesses for 10-15 years. We have acquired seven platform companies since founding (not including add-on acquisitions) and currently have four active investments: Organic Dyes and Pigments, Omega Technologies, Boston Interiors Furniture, and ADT Pizza.