The mission of the Friends of Sears Island (FOSI) is to support permanent protection of Sears Island’s environmental and cultural resources; preserve its marine, shoreland, and forest ecosystems; and encourage educational and low impact recreational uses of the island.

In 2009, when then Governor John Baldacci signed into law the Conservation Easement on 601 acres, FOSI agreed to assume the role of volunteer stewards, in partnership with Maine Coast Heritage Trust, holder of the easement.