Arq CTO shares withheld for RSA tax obligations

Arq, Inc. Chief Technology Officer Joseph M. Wong reported a routine share disposition related to taxes, not an open-market trade.

Rhea-AI Filing Summary

Arq, Inc. Chief Technology Officer Joseph M. Wong reported a routine share disposition related to taxes, not an open-market trade. On March 23, 2026, 10,085 shares of common stock were withheld at $2.27 per share to satisfy tax obligations from vesting restricted stock awards. After this tax-withholding transaction, Wong directly held 390,601 shares of Arq common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 10,085 shares

Exercise Price or Tax Liability 1 txn

Insider Wong Joseph M

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	10,085	$2.27	$23K

Holdings After Transaction: Common Stock — 390,601 shares (Direct)

Footnotes (1)

1. F1. 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.

FAQ

What insider transaction did Arq (ARQ) report for Joseph M. Wong?

Arq reported that CTO Joseph M. Wong had 10,085 shares of common stock withheld to cover tax obligations tied to vesting restricted stock awards. This was a Form 4 tax-withholding disposition, not an open-market purchase or sale of shares.

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

No, the transaction was not an open-market sale. Shares were withheld to satisfy tax withholding obligations related to vesting restricted stock awards, classified with code F on Form 4. This reflects a mechanical tax payment rather than a discretionary sale decision.

How many Arq (ARQ) shares were withheld for taxes in this Form 4?

A total of 10,085 shares of Arq common stock were withheld to cover tax obligations. The withholding price was reported as $2.27 per share, and it occurred in connection with the vesting of restricted stock awards on March 23, 2026.

How many Arq (ARQ) shares does CTO Joseph M. Wong hold after the transaction?

After the tax-withholding disposition, Joseph M. Wong directly holds 390,601 shares of Arq common stock. This figure reflects his position following the 10,085 shares withheld to satisfy tax obligations from vesting restricted stock awards on March 23, 2026.

What does transaction code F mean in the Arq (ARQ) Form 4 filing?

Transaction code F designates a payment of exercise price or tax liability by delivering securities. In this case, 10,085 Arq shares were withheld to satisfy tax obligations from vesting restricted stock awards, rather than being sold in the open market by the insider.

What event triggered the share withholding for Arq (ARQ) CTO Joseph M. Wong?

The withholding was triggered by the vesting of restricted stock awards on March 23, 2026. To satisfy related tax withholding obligations, 10,085 shares of Arq common stock were withheld, as disclosed in the Form 4 footnote describing the RSAs and associated tax treatment.

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Accepted by SEC EDGAR 03/25/2026 - 08:00 AM 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).

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^*

Wong Joseph M

(Last) (First) (Middle)

8051 E MAPLEWOOD AVE, STE 210

C/O ARQ, INC.

(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 Technology 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		10,085(1)	D	$2.27	390,601	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/ Joseph M Wong	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)