Executive Change · Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC  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):  September 29, 2021 Modine Manufacturing Company (Exact name of registrant as specified in its charter) Wisconsin 001-01373 39-0482000 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification Number) 1500 DeKoven Avenue , Racine , Wisconsin   53403 (Address of principal executive offices)   (Zip Code) Registrant's telephone number, including area code:   ( 262 ) 636-1200 (Former name or former address, if changed since last report.)   N/A 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, $0.625 par value   MOD New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230 .40 5 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.  ☐ Information to be Included in the Report Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers Effective September 29, 2021, Joel T. Casterton is no longer serving in the role of Vice President, Heavy Duty Equipment of Modine Manufacturing Company (the “Company”).  Mr. Casterton will be leaving the Company later in October to pursue other opportunities. The terms of any separation arrangement with Mr. Casterton have not been determined as of the time of the filing of this Current Report on Form 8-K, and will be provided, to the extent required under applicable regulations, by amendment to this report within four business days after such information becomes available. Item 8.01 Other Events . On October 5, 2021, the Company issued a press release announcing the separation of Mr. Casterton as described in Item 5.02, above.  A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits.   (d) Exhibits The following exhibit is being furnished herewith: 99.1 Press Release issued October 5, 2021. 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.   Modine Manufacturing Company           By: /s/ Sylvia A. Stein     Sylvia A. Stein   Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer     Date:  October 5, 2021   2