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Calumet, Inc. /DE_February 27, 2026 Calumet, Inc. /DE0002013745false00020137452026-02-272026-02-27 ​ ​

UNITED STATES 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): February 27, 2026

CALUMET, INC.

(Exact name of registrant as specified in its charter)

​ Delaware ​ ​ ​ 001-42172 ​ ​ ​ 36-5098520

(State or other jurisdiction of incorporation) ​ (Commission File Number) ​ (IRS Employer Identification No.)

​ 1060 N Capitol Ave Suite 6-401 Indianapolis, Indiana 46204 (Address of principal executive offices) (Zip Code) ​ Registrant’s telephone number, including area code (317) 328-5660 ​ (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:

Title of each class ​ ​ ​ Trading symbol(s) ​ ​ ​ Name of each exchange on which registered

Common Stock, par value $0.01 per share ​

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​ The Nasdaq Stock Market LLC ​

​ 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 2.02 Results of Operations and Financial Condition. On February 27, 2026, Calumet, Inc. reported results of operations for the quarter and year ended December 31, 2025, pursuant to a press release. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. In accordance with General Instruction B.2 of Form 8-K, the information contained in this report shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section, nor shall such information and Exhibit be deemed incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except as shall be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. ​ Exhibit No. ​ ​ ​ Description

99.1 ​ Press release dated February 27, 2026.

104 ​ Cover Page Interactive Data File- the cover page XBRL tags are embedded within the Inline XBRL document.

​ ​ ​

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. ​ ​

​

​ ​

​

CALUMET, INC.

​ ​

​ ​ ​

February 27, 2026 By: /s/ David Lunin

​ ​ Name: David Lunin

​ ​ Title: Executive Vice President and Chief Financial Officer

​ ​ ​

8-K

Calumet, Inc. /DE false 0002013745 0002013745 2026-01-05 2026-01-05

UNITED STATES

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): January 5, 2026

CALUMET, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-42172

36-5098520

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

1060 N Capitol Ave Suite 6-401 Indianapolis, Indiana 46204 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code (317) 328-5660

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:

Title of each class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.01 per share

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The Nasdaq Stock Market LLC 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 2.02 Results of Operations and Financial Condition.

On January 5, 2026, Calumet, Inc. (the “Company”) issued a press release announcing preliminary unaudited information related to the Company’s liquidity and select fiscal year 2025 financial results. A copy of the press release is furnished as Exhibit 99.1 hereto and incorporated by reference herein. In accordance with General Instruction B.2 of Form 8-K, the information contained in this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall such information and Exhibit 99.1 be deemed incorporated by 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 filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Exhibit Title or Description

99.1

Press Release, dated January 5, 2026, announcing preliminary unaudited information.

104

Cover Page Interactive Data File- the cover page XBRL tags are embedded within the Inline XBRL document.

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.

CALUMET, INC.

Date: January 5, 2026

By:

/s/ David Lunin

Name:

David Lunin

Title:

Executive Vice President and Chief Financial Officer