Three key employees have purchased ownership of Winslow Management Co. from Adams Harkness, an investment-banking firm, for an undisclosed sum.

President and founder Jackson W. Robinson and portfolio managers Elizabeth Cluett Thors and Matthew W. Patsky take the helm as the new owners. Robinson and Patsky also serve as co-managers of the Winslow Green Growth Fund, a green, small-cap growth fund. The fund ended the second quarter with a return of 9.33%, well exceeding the Russell 2000 Growth Index, which finished at 3.48%.

While Adams Harkness' Boston headquarters will continue to be home to Winslow, Robinson feels that "being independent will allow us to focus on growing our business."

Established by Robinson in 1984, Winslow is thought to be the originator of the green-investing firm. In 1999, the merger between Winslow and Adams Harkness took place and today the company has $245 million in assets.

Winslow employs what it calls "negative screens" to avoid investing in companies that are detrimental to the environment, and positive screens to identify companies that are beneficial to the environment.

Together with the Green Growth Fund, Winslow offers portfolio management for high-net-worth clients and institutions.

Robinson acquired his green-investing strategy while he was an officer and director of Garden Way Inc. and while serving as president of the National Gardening Association.

Thors was with Adam Harkness' investment banking division before joining Winslow in 2000. Patsky was director of equity research for Adams Harkness prior to signing on with Winslow in 2002.

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