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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

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Washington, D.C. 20549

FORM 8-K

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CURRENT REPORT

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Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): April 1, 2024

CALUMET SPECIALTY PRODUCTS PARTNERS, L.P.

(Exact name of registrant as specified in its charter)

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Delaware		000-51734		35-1811116
(State or other jurisdiction of incorporation)	​	(Commission File Number)	​	(IRS Employer Identification No.)

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2780 Waterfront Pkwy E. Drive

Suite 200

Indianapolis, Indiana 46214

(Address of principal executive offices) (Zip Code)

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Registrant’s telephone number, including area code (317) 328-5660

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

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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:

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☐ 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:

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Title of each class		Trading symbol(s)		Name of each exchange on which registered
Common units representing limited partner interests	​	CLMT	​	The Nasdaq Stock Market LLC

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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).

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Emerging growth company ☐

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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. ☐

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Item 5.02

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On April 1, 2024, Ryan A. Willman notified Calumet GP, LLC (the “Company”), the general partner of Calumet Specialty Products Partners, L.P., of his resignation as the Company’s Chief Accounting Officer and principal accounting officer, effective April 26, 2024 (the “Effective Date”).

On April 4, 2024, the Board of Directors of the Company appointed Vincent Donargo as the Company’s Chief Accounting Officer and principal accounting officer effective upon Mr. Willman’s departure on the Effective Date. Mr. Willman will continue to serve as the Company’s Chief Accounting Officer and principal accounting officer until the Effective Date.

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SIGNATURES

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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.

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​	CALUMET SPECIALTY PRODUCTS PARTNERS, L.P.
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​	By:	CALUMET GP, LLC, its General Partner
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April 5, 2024	By:	/s/ Todd Borgmann
​	​	Name: Todd Borgmann
​	​	Title: Chief Executive Officer

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