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

Reporting relationship: Gen Counsel, Corp Secretary
Issuer ticker: ARQ
Reported as of: 27 Feb 2026
Net transaction value: -$35,718
SEC form: 4
Accepted by SEC: 03 Mar 2026, 17:09:03 UTC
Prior SEC filing: 06 Aug 2025
Next SEC filing: 16 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Claiborne B. Smith

Key filing fact

Claiborne B. Smith filed Form 4 for Arq, Inc. (ARQ) on 03 Mar 2026.

Key facts

This page summarizes Claiborne B. Smith's Form 4 filing for Arq, Inc. (ARQ).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 03 Mar 2026, 17:09.

Change

Previous filing in this sequence was filed on 06 Aug 2025.
Current net transaction value: -$35,718.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002021219 Primary reporting owner

Smith Claiborne Benson

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ARQ transaction

Common Stock

Options Exercise

Transaction value
Shares: +28,229
Change %: +34%
Price
Shares after: 110,667
Date: 27 Feb 2026
Ownership: Direct
Footnotes: F1

ARQ transaction

Common Stock

Tax liability

Transaction value: $35,718
Shares: -10,176
Change %: -9.2%
Price: $3.51
Shares after: 100,491
Date: 27 Feb 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ARQ transaction Derivative

Performance Share Units

Options Exercise

Transaction value: $0
Shares: -21,179
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 27 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 42,358
Exercise price
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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.

Footnote 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.

Footnote F3

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