Every material Form 8-K Ameresco, Inc. has filed with the SEC since August 19, 2026, read and summarized by AI: what happened, the key figures, whether it reads positive or negative for shareholders, and how big a deal it is (impact 1-5). Newest first; each brief links to its own page and to the filing on SEC.gov.
Ameresco's board named two finance vice presidents to serve as interim principal financial officer and interim principal accounting officer while the company searches for a new chief financial officer. CFO Mark Chiplock, who resigned as previously disclosed in an August 19, 2026 filing, leaves the role effective September 25, 2026.
Julie Bradshaw, Vice President, Finance, designated interim principal financial officer on September 8, 2026
Debbie Angelico, Vice President, Finance, designated interim principal accounting officer on September 8, 2026
Mark Chiplock's resignation as CFO and principal financial and accounting officer is effective September 25, 2026
The company has commenced a search for a new Chief Financial Officer
Ameresco director David J. Corrsin resigned from the board and retired as Executive Vice President and General Counsel, both effective August 17, 2026. He will continue as the Company's Special Legal Advisor, and the filing states the resignation was not due to any disagreement with the Company.
David J. Corrsin, 68, resigned as a Class II director effective August 17, 2026
He also retired as Executive Vice President and General Counsel, effective August 17, 2026
Corrsin will continue to serve as Special Legal Advisor
Corrsin had served as a director since the Company's formation in 2000
Ameresco said its Chief Financial Officer and Chief Accounting Officer, Mark Chiplock, will resign effective September 25, 2026, to take a CFO role at a private equity-owned company in a different industry. The company said the departure was not the result of any disagreement on its operations, policies or practices, and it has started a search for a successor. The company also reiterated its full-year 2026 guidance, which matters to shareholders because it gives no sign of a change in the outlook alongside the leadership change.
Mark A. Chiplock resigned as EVP, CFO and Chief Accounting Officer; the company received notice on August 17, 2026, and the resignation is effective September 25, 2026.
Chiplock will remain CFO through September 25, 2026, to support an orderly transition.
Full-year 2026 guidance reiterated: revenue of $2.0 billion to $2.2 billion, Adjusted EBITDA of $250 million to $270 million, and Non-GAAP EPS of $1.15 to $1.35.
The company has begun a search for its next Chief Financial Officer.
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