Claiborne B. Smith - 27 Feb 2026 Form 4 Insider Report for Arq, Inc. (ARQ)

Role: Gen Counsel, Corp Secretary
Signature: /s/ Claiborne B. Smith
Issuer symbol: ARQ
Transactions as of: 27 Feb 2026
Net transactions value: -$35,718
Form type: 4
Filing time: 03 Mar 2026, 17:09:03 UTC
Previous filing: 06 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Smith Claiborne Benson	Gen Counsel, Corp Secretary	C/O ARQ, INC, 8051 E. MAPLEWOOD AVE, STE 210, GREENWOOD VILLAGE	/s/ Claiborne B. Smith	03 Mar 2026	0002021219

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ARQ	Common Stock	Options Exercise		+28,229	+34%		110,667	27 Feb 2026	Direct	F1
transaction	ARQ	Common Stock	Tax liability	$35,718	-10,176	-9.2%	$3.51	100,491	27 Feb 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ARQ	Performance Share Units	Options Exercise	$0	-21,179	-100%	$0.000000	0	27 Feb 2026	Common Stock	42,358		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 21,179 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, 28,229 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.
F2	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.
F3	Represents the maximum number of PSUs that were eligible to vest, which was 200% of the target award.