UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.  )

Filed by the Registrant ☒          Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

CALUMET SPECIALTY PRODUCTS PARTNERS, L.P.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒ No fee required.

☐ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1) Title of each class of securities to which transaction applies:

(2) Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4) Proposed maximum aggregate value of transaction:

(5) Total fee paid:

☐ Fee paid previously with preliminary materials.

☐ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1) Amount Previously Paid:

(2) Form, Schedule or Registration Statement No.:

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(4)  Date Filed:

+ The Sample Company Online Go to www.envisionreports.com/CLMT or scan the QR code — login details are located in the shaded bar below. Votes submitted electronically must be received by 11:59 pm (Eastern Time), on February 15, 2022 Special Unitholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the Calumet Specialty Products Partners, L.P. Special Meeting of Unitholders to be Held on February 16, 2022 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the special unitholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the special meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The proxy statement is available at: www.envisionreports.com/CLMT Easy Online Access — View your proxy materials and vote. Step 1: Go to www.envisionreports.com/CLMT. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Paper or Email Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before January 30, 2022 to facilitate timely delivery. 03K1ND 2 N O T + Special Unitholder Meeting Notice The Calumet Specialty Products Partners, L.P. Special Meeting of Unitholders will be held on February 16, 2022 at the Courtyard by Marriott, 6315 Crawfordsville Rd., Indianapolis, IN 46224, at 2:00 p.m. Eastern Time. If you plan to attend the special meeting, please refer to the instructions in the proxy statement. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommend a vote FOR Proposals 1 and 2 1. Proposal to approve an amendment to the Calumet GP, LLC Amended and Restated Long-Term Incentive Plan to increase the number of common units that may be delivered pursuant to awards under such plan by 1,400,000 common units to an aggregate of 5,283,960 common units 2. Proposal to approve the adjournment of the special meeting to a later date or dates, if deemed necessary or appropriate to solicit additional proxies if there are not sufficient votes at the time of the special meeting to approve Proposal 1 PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — Internet – Go to www.envisionreports.com/CLMT. Click Cast Your Vote or Request Materials. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with “Proxy Materials Calumet Special Products” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, all requests for a paper copy of proxy materials must be received by January 30, 2022.