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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:

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 o

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. o On August 14, 2025, the Board of Directors (the “Board”) of OneWater Marine Inc. (the “Company”) approved a series of leadership adjustments, each effective immediately, as described below.

•P. Austin Singleton, who has served as the Company’s Chief Executive Officer and as a member of the Board since April 2019, is transitioning from his role as Chief Executive Officer to assume the role of Executive Chairman of the Board.

•John F. Schraudenbach, who has served as an independent member of the Board since February 2020, and as Chairman of the Board since February 2023, will transition from his role as Chairman of the Board to assume the role of Lead Independent Director. As Lead Independent Director, Mr. Schraudenbach will continue to serve as a liaison between the non-independent members of the Board and the independent members of the Board and will continue to be responsible for the independent oversight function of the Board.

•Anthony Aisquith, age 58, who has served as the Company’s President and Chief Operating Officer since April 2019, and as a member of the Board since May 2020, was appointed as the Company’s Chief Executive Officer. Mr. Aisquith will continue to serve as a member of the Board. Biographical information regarding Mr. Aisquith is available in the “Directors Nominated for Election” section of the Company’s definitive proxy statement for its 2025 annual meeting of stockholders, filed with the Securities and Exchange Commission on January 10, 2025 (the “Proxy Statement”), beginning on page 7. There are no arrangements or understandings between Mr. Aisquith and any other person pursuant to which he was selected as Chief Executive Officer. Mr. Aisquith does not have any family relationship with any director or executive officer of the Company or with any person nominated or chosen by the Company to become a director or executive officer. There are no transactions in which Mr. Aisquith has an interest requiring disclosure under Item 404(a) of Regulation S-K other than those disclosed in the “Certain Relationships and Related Party Transactions” section of the Proxy Statement, beginning on page 45.

•Jack Ezzell, age 55, who has served as the Company’s Chief Financial Officer and Secretary since April 2019, was appointed to fill the position of Chief Operating Officer. Mr. Ezzell will retain his role as Chief Financial Officer and Secretary and will continue to serve as the Company’s principal financial officer. Biographical information regarding Mr. Ezzell is available in the “Executive Officers” section of the Proxy Statement, beginning on page 19. There are no arrangements or understandings between Mr. Ezzell and any other person pursuant to which he was selected as Chief Operating Officer. Mr. Ezzell does not have any family relationship with any director or executive officer of the Company or with any person nominated or chosen by the Company to become a director or executive officer. There are no transactions in which Mr. Ezzell has an interest requiring disclosure under Item 404(a) of Regulation S-K.

Except as described above, there were no other changes to the composition of the Board or the Company’s executive officers.

On August 19, 2025 the Company issued a press release announcing the foregoing leadership transitions. A copy of the press release is furnished as Exhibit 99.1 to this report and is incorporated into this Item 7.01 by reference.

The information furnished pursuant to this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any filing under the Securities Act of 1933, as amended, unless specifically identified therein as being incorporated therein by reference.

(d) Exhibits.

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.