Ameresco Shares Acquired by Granahan Investment Management

Granahan Investment Management increases stake in energy efficiency company Ameresco by over 100%

Mar. 16, 2026 at 10:38am

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Granahan Investment Management LLC, a hedge fund, has increased its stake in Ameresco, Inc. (NYSE:AMRC), an energy efficiency and renewable energy solutions provider, by 108.4% during the third quarter. The firm now owns approximately 1.69% of Ameresco's outstanding shares, making it one of the company's largest institutional investors.

Why it matters

Ameresco is a leading player in the growing energy efficiency and renewable energy solutions market, providing services to businesses and governments. The significant increase in Granahan Investment Management's stake suggests the firm sees strong potential in Ameresco's business model and future growth prospects.

The details

According to a 13F filing with the SEC, Granahan Investment Management acquired an additional 462,875 shares of Ameresco during the third quarter, bringing its total holdings to 890,072 shares. This represents a 108.4% increase in the firm's stake in the company. Ameresco provides a range of energy efficiency and renewable energy solutions, including energy efficiency retrofits, infrastructure upgrades, distributed generation systems, and facility-scale renewable projects.

  • Granahan Investment Management increased its stake in Ameresco during the third quarter of 2026.
  • Ameresco's stock price closed at $24.73 on Monday, March 16, 2026.

The players

Granahan Investment Management LLC

A hedge fund that has significantly increased its stake in Ameresco, making it one of the company's largest institutional investors.

Ameresco, Inc.

An American energy efficiency and renewable energy solutions provider, headquartered in Framingham, Massachusetts.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident

The takeaway

Granahan Investment Management's increased stake in Ameresco reflects the firm's confidence in the company's ability to capitalize on the growing demand for energy efficiency and renewable energy solutions, particularly as businesses and governments seek to reduce their environmental impact and operating costs.