Ameresco CFO sells 476 shares in tax trade

Ameresco’s CFO reported an automatic Rule 10b5-1 sell-to-cover sale of 476 shares to pay RSU-related withholding taxes.

Rhea-AI Filing Summary

Ameresco, Inc. (AMRC) Executive Vice President, Chief Financial Officer and Chief Accounting Officer Mark Chiplock reported a sale of 476 shares of Class A Common Stock on September 15, 2026 at $22.46 per share. The filing states the shares were sold under an automatic sell-to-cover instruction solely to cover withholding taxes upon vesting of RSUs, pursuant to a Rule 10b5-1 trading plan, leaving 2,815 shares held directly.

Insider Trade Summary 10b5-1

Net Seller: 476 shares

Net Sell 1 txn

Insider Chiplock Mark

Role EVP, CFO & CAO

Sold 476 shs ($11K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1	476	$22.46	$11K

Holdings After Transaction: Class A Common Stock — 2,815 shares (Direct)

Footnotes (1)

1. F1. The shares were sold pursuant to an automatic sell-to-cover instruction signed March 7, 2023 solely to cover applicable withholding taxes in connection with the vesting of RSUs.

Key Figures

Shares sold: 476 shares Sale price per share: $22.46 per share Shares held after transaction: 2,815 shares +1 more

4 metrics

Shares sold 476 shares Class A Common Stock sold by Ameresco’s CFO on September 15, 2026

Sale price per share $22.46 per share Price for the 476 Ameresco shares sold on September 15, 2026

Shares held after transaction 2,815 shares Direct Class A Common Stock holdings of the CFO after the sale

Net shares sold 476 shares Net sell activity reported in the transaction summary

Key Terms

Rule 10b5-1, sell-to-cover, withholding taxes, RSUs

4 terms

Rule 10b5-1 regulatory

"transactions were made pursuant to a Rule 10b5-1 trading plan"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

sell-to-cover financial

"shares were sold pursuant to an automatic sell-to-cover instruction"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

withholding taxes financial

"solely to cover applicable withholding taxes in connection with the vesting"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

RSUs financial

"in connection with the vesting of RSUs"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Ameresco (AMRC) report in this Form 4 for its CFO?

Ameresco reported that EVP, CFO & CAO Mark Chiplock sold 476 shares of Class A Common Stock on September 15, 2026 at $22.46 per share under an automatic sell-to-cover instruction tied to RSU vesting and tax withholding.

Was the AMRC insider sale by the CFO under a Rule 10b5-1 plan?

Yes. The filing indicates the transaction was made pursuant to a Rule 10b5-1 trading plan, with an automatic sell-to-cover instruction signed on March 7, 2023 to cover withholding taxes related to RSU vesting.

How many Ameresco (AMRC) shares did the CFO sell and at what price?

Mark Chiplock sold 476 shares of Ameresco Class A Common Stock at $22.46 per share on September 15, 2026, characterized as a sale in the open market or a private transaction.

How many AMRC shares does the CFO hold after this reported transaction?

After the September 15, 2026 sell-to-cover transaction, the Form 4 reports that Mark Chiplock directly holds 2,815 shares of Ameresco Class A Common Stock.

What is the purpose of the AMRC CFO’s sell-to-cover transaction?

The footnote states the 476 shares were sold pursuant to an automatic sell-to-cover instruction solely to cover applicable withholding taxes in connection with the vesting of restricted stock units (RSUs).

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 04:41 PM Accepted by SEC EDGAR 09/17/2026 - 04:41 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Chiplock Mark

(Last) (First) (Middle)

C/O AMERESCO, INC.

111 SPEEN STREET, SUITE 410

(Street)

FRAMINGHAM MASSACHUSETTS 01701

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Ameresco, Inc. [ AMRC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, CFO & CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	09/15/2026		S		476(1)	D	$22.46	2,815	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares were sold pursuant to an automatic sell-to-cover instruction signed March 7, 2023 solely to cover applicable withholding taxes in connection with the vesting of RSUs.

Remarks:

	/s/ John W. Pickett, attorney-in-fact	09/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)