U.S. SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 931, 2026

ARQ, INC.

(Name of registrant as specified in its charter)

Delaware

001-37822

27-5472457

(State or other jurisdiction of incorporation)

(Commission File Number)

(I.R.S. Employer Identification Number)


8051 E. Maplewood Avenue, Suite 210, Greenwood Village, CO						80111
(Address of principal executive offices)						(Zip Code)

Registrant's telephone number, including area code: (720) 598-3500

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


☐						Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


☐						Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


☐						Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


☐						Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Class

Trading Symbol

Name of each exchange on which registered

Common stock, par value $0.001 per share

ARQ

Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).


	Emerging growth company	☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.		☐

Item 21.0201 ~~Results~~Entry ofinto ~~Operations~~a ~~and~~Material ~~Financial~~Definitive ~~Condition~~Agreement.

On March 931, 2026, Arq, Inc. (the "~~Arq~~Company") ~~issued~~and acertain ~~press~~of ~~release~~its ~~related~~subsidiaries, toentered into the ~~filing~~fifth ofamendment ~~Arq's~~(the ~~Annual~~"Fifth ~~Report~~Amendment") onto ~~Form~~the ~~10-K~~Credit, ~~for~~Security and Guaranty Agreement (the ~~fourth~~"Revolving ~~quarter~~Credit ~~and~~Agreement"), ~~year~~dated ~~ended~~December 27, 2024, as amended on May 6, 2025, December 31 9, 2025, January 28, 2026, and ~~posted~~February to27, 2026, with MidCap Funding IV Trust, in its ~~website~~capacity anas ~~investor~~agent, ~~presentation~~the ~~related~~lenders from time to ~~Arq's~~time ~~financial~~party ~~results~~thereto, and any entities that become party thereto as Guarantors. The Fifth Amendment provides for, among other things, the ~~fourth~~replacement ~~quarter~~of the existing minimum liquidity covenant with a $2.5 million availability reserve requirement, which will increase to $5 million beginning in January 2027, the addition of certain eligible equipment and ~~year~~Rolling ~~ended~~Stock ~~December 31~~(as defined in the Revolving Credit Agreement) to the borrowing availability calculation included in the Revolving Credit Agreement, ~~2025~~and certain amendments to the definition of Eligible Accounts to allow for higher single customer concentration until August 2026.

AThe ~~copy~~foregoing description of the ~~press~~Fifth ~~release~~Amendment is ~~furnished~~only asa ~~Exhibit~~summary ~~99.1~~of toits ~~this~~material ~~report.~~terms ~~The~~and ~~information~~does ~~furnished~~not ~~pursuant~~purport to ~~this~~be ~~Item~~complete ~~2.02,~~and ~~including~~is ~~the~~qualified ~~attached~~in ~~exhibits,~~its ~~shall~~entirety ~~not~~by bereference ~~deemed~~to ~~"filed"~~the ~~for~~full ~~purposes~~text of the ~~Securities~~Fifth ~~Exchange~~Amendment, ~~Act~~which ofis ~~1934,~~filed as ~~amended~~Exhibit ~~(the~~10.1 ~~"Exchange Act"), or otherwise subject~~ to ~~the~~this ~~liabilities~~Current ofReport ~~such~~on ~~section,~~Form ~~nor~~8-K ~~shall~~and ~~such information or exhibit be deemed~~ incorporated byherein ~~reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth~~ by ~~specific~~ reference ~~in such a filing~~.

Cautionary Note Regarding Forward-Looking Statements. The press release contains forward-looking statements that involve certain risks and uncertainties that could cause actual results to differ materially from those expressed or implied by these statements. Please refer to the cautionary notes at the end of the press release regarding these forward-looking statements.


Item 9.01						Financial Statements and Exhibits.

(d)						Exhibits

Item 9.01						Financial Statements and Exhibits.
(d)						Exhibits
Exhibit No.						Description
99.1						Press Release dated March 9, 2026
10.1						Amendment No. 5, dated as of March 31, 2026, to Credit, Security and Guaranty Agreement, dated as of December 27, 2024, as amended, by and among Arq, Inc., certain subsidiaries of Arq, Inc., MidCap Funding IV Trust as agent, and the lenders from time to time party thereto., **
104						Cover Page Interactive Data File (embedded within the Inline XBRL document).

2* – Schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The Company hereby undertakes to furnish supplemental copies of any of the omitted schedules and exhibits upon request by the SEC.

~~Pursuant~~*** to– ~~the~~Portions ~~requirements~~ of ~~the~~this ~~Securities~~exhibit ~~Exchange~~have ~~Act~~been ofomitted ~~1934,~~pursuant ~~the~~to ~~Registrant~~Item ~~duly~~601(b)(10) ~~caused~~as ~~this~~information ~~report~~that tothe beCompany ~~signed~~customarily onand ~~its~~actually ~~behalf~~treats bythat ~~the~~information ~~undersigned~~as ~~hereunto~~private ~~duly~~or ~~authorized~~confidential and is not material.

~~Date: March 10, 2026~~ 1

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: April 1, 2026


			Arq, Inc.
			Registrant


			/s/ Robert Rasmus
			Robert Rasmus
			Chief Executive Officer

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