Arq (ARQ) CAO Hansen has 8,894 shares withheld for RSA tax

Rhea-AI Filing Summary

Arq, Inc. reported that Chief Accounting Officer Stacia Hansen had 8,894 shares of common stock withheld on March 23, 2026 to satisfy tax obligations tied to the vesting of restricted stock awards. These shares were valued at $2.27 per share for the withholding calculation. After this tax-withholding event, Hansen directly holds 64,305 shares of Arq common stock.

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

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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^*

Hansen Stacia

(Last) (First) (Middle)

C/O ARQ, INC.

8051 E. MAPLEWOOD AVE, STE 210

(Street)

GREENWOOD VILLAGE COLORADO 80111

(City) (State) (Zip)

UNITED STATES

(Country)

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 Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/23/2026

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
Common Stock	03/23/2026		F		8,894(1)	D	$2.27	64,305	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. Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on March 23, 2026.

Remarks:

	/s/ Stacia Hansen	03/25/2026
	** 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)

FAQ

What insider transaction did Arq (ARQ) report for Stacia Hansen?

Arq reported that Chief Accounting Officer Stacia Hansen had 8,894 common shares withheld to cover taxes on vested restricted stock awards. This is a non-market tax-withholding event rather than an open-market purchase or sale of Arq shares.

Was the Arq (ARQ) insider transaction an open-market sale of shares?

No. The 8,894 Arq shares were withheld to satisfy tax obligations from vesting restricted stock awards. This type of Form 4 transaction does not involve an open-market sale and reflects routine equity compensation tax treatment.

How many Arq (ARQ) shares does Stacia Hansen hold after the tax withholding?

Following the tax-withholding disposition of 8,894 shares, Chief Accounting Officer Stacia Hansen directly holds 64,305 Arq common shares. This figure reflects her remaining reported ownership after the restricted stock awards vested and related taxes were satisfied.

What price was used for the Arq (ARQ) tax-withholding shares?

The withheld 8,894 Arq common shares were valued at $2.27 per share for tax purposes. This price is used to calculate the value of the shares applied toward Hansen’s tax liability on the vesting restricted stock awards on March 23, 2026.

What triggered the tax-withholding transaction reported by Arq (ARQ)?

The transaction was triggered by the vesting of restricted stock awards on March 23, 2026. To cover related tax obligations, 8,894 Arq common shares were withheld instead of paying cash taxes, a common feature of equity-based compensation programs.