F.L. Putnam Investment Management Company, a Wellesley, Mass.-based firm with an office in New Hampshire, has acquired Atrato Advisors LLC, an alternative investment research and advisory firm.

The acquisition combines the firm’s existing capabilities in traditional and impact investments with Atrato’s expertise in alternative strategies, the company said. Financial terms of the deal were not disclosed.

“Expanding the opportunity set for our clients has been a strategic focus for F.L. Putnam since our founding more than three decades ago. Atrato is one of the premier alternative investment advisory boutiques and will significantly enhance our sourcing, diligence and reporting capabilities across all asset classes, from private equity to impact-related investments,” said Putnam CEO Tom Manning.

The combined practice will be known as Atrato Consulting and will deliver investment consulting solutions to F.L. Putnam’s individual and institutional clients, he said.

The combined firm has 63 employees and more than $5 billion in assets under advisory.