Arq (ARQ) COO logs PSU vesting, common stock issuance and tax shares

Rhea-AI Filing Summary

Arq, Inc. Chief Operating Officer Jeremy Williamson reported equity compensation activity involving performance share units (PSUs) and common stock. On February 27, 2026, 68,600 PSUs vested based on performance for a three-year period ended December 31, 2025, with each PSU converting into one share of common stock.

The filing shows an exercise or conversion of 51,467 PSUs and an acquisition of 68,600 shares of common stock at a stated price of $0.00 per share. To cover related tax withholding obligations upon vesting, 18,282 shares of common stock were disposed of at $3.51 per share, leaving 185,606 shares of common stock owned directly after these transactions.

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).

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^*

Williamson Jeremy

(Last) (First) (Middle)

C/O ARQ, INC.

8051 E. MAPLEWOOD AVE., SUITE 210

(Street)

GREENWOOD VILLAGE CO 80111

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Arq, Inc. [ ARQ ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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

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

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

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
Common Stock	02/27/2026		M		68,600	A	(1)	203,888	D
Common Stock	02/27/2026		F		18,282(2)	D	$3.51	185,606	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
Performance Share Units	(1)	02/27/2026		M			51,467	(1)	03/10/2026	Common Stock	102,934(3)	$0	0	D

Explanation of Responses:

1. On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 51,467 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 68,600 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

2. Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of PSUs on February 27, 2026.

3. Represents the maximum number of PSUs that were eligible to vest, if at all, which was 200% of the target award.

Remarks:

	/s/ Jeremy Williamson	03/03/2026
	** 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.

FAQ

What insider transactions did Arq (ARQ) report for Jeremy Williamson?

Arq’s Chief Operating Officer Jeremy Williamson reported equity compensation activity on performance share units and common stock. Performance share units converted into common shares, and a portion of those shares was withheld and disposed of to satisfy tax obligations tied to the vesting event.

How many performance share units vested for Arq COO Jeremy Williamson?

Arq disclosed that 68,600 performance share units vested for COO Jeremy Williamson based on specific performance criteria over a three-year period ended December 31, 2025. Each vested unit represented the right to receive one share of Arq’s common stock upon conversion on February 27, 2026.

How many Arq common shares did Jeremy Williamson acquire and hold after these Form 4 transactions?

Jeremy Williamson acquired 68,600 shares of Arq common stock through the conversion of vested performance share units. After accounting for tax-related share withholding and disposition, his direct holdings in Arq common stock totaled 185,606 shares following the transactions reported as of February 27, 2026.

What does the tax withholding disposition in the Arq Form 4 filing represent?

The Form 4 shows 18,282 Arq common shares disposed of at $3.51 per share to satisfy tax withholding obligations. This transaction reflects shares withheld and delivered for taxes arising from the vesting of performance share units, rather than an open-market sale by Jeremy Williamson.

Were the Arq Form 4 transactions open-market buys or sells by Jeremy Williamson?

The Arq Form 4 reflects an exercise or conversion of derivative securities and a tax-withholding disposition, not open-market buys or sells. Performance share units converted into common stock, and some resulting shares were delivered to cover tax liabilities associated with the vesting event on February 27, 2026.

What performance period determined the vesting of Arq performance share units?

The vesting of Arq performance share units for Jeremy Williamson was based on achieving specific performance criteria over a three-year performance period ending December 31, 2025. The Compensation Committee determined vesting outcomes on February 27, 2026, leading to the conversion of vested units into common stock.