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): ~~October~~August 109, ~~2024~~2025

EATON VANCE MUNICIPAL BOND FUND

(Exact name of registrant as specified in its charter)

Massachusetts

(State or other jurisdiction

of incorporation)

811-21142

(Commission File Number)

54-2064459

(IRS Employer

Identification No.)

One Post Office Square

Boston, Massachusetts

(Address of principal executive offices)

02109

(Zip Code)

(617) 482-8260
(Registrant’s telephone number, including area code)

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:

Titles of Each Class	Trading Symbol	Name of exchange on which registered
Common Shares of Beneficial Interest, $0.01 par value	EIM	NYSE American 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 58.0301 ~~Amendments~~Other ~~to Articles of Incorporation or Bylaws; Change in Fiscal Year.~~Events

OnMr. ~~January~~Mark ~~26,~~R. ~~2023~~Fetting, who served as Chairperson of the Board of Trustees of the ~~Fund~~registrant (the “Board”), ~~voted~~unexpectedly topassed ~~exempt,~~away on aAugust ~~going~~9, ~~forward~~2025. ~~basis,~~Ms. ~~all~~Susan ~~prior~~J. ~~and,~~Sutherland ~~until~~is ~~further~~serving ~~notice,~~as ~~new~~acting ~~acquisitions~~Chairperson of ~~Fund shares that otherwise might be deemed “Control Share Acquisitions” under~~ the ~~Fund’s~~Board. ~~Amended~~Effective ~~and Restated~~as ~~By-Laws (the “By-Laws”) from the provisions~~ of ~~the~~August ~~By-Laws addressing “Control Share Acquisitions” (the “Control Share Provisions”). On October 10~~12, ~~2024~~2025, the Board ~~adopted~~has ~~Amendment~~reduced ~~No. 1 to~~ the ~~By-Laws~~size toof ~~formally eliminate~~ the ~~Control~~ ~~Share~~Board ~~Provisions~~from ~~and~~ten to ~~make~~nine ~~certain related conforming changes~~members.

~~A copy of Amendment No. 1 to the By-Laws is attached hereto as Exhibit 5.03 and incorporated by reference herein.~~SIGNATURE

~~Item~~Pursuant to ~~9.01~~the ~~Financial~~requirements ~~Statements~~of ~~and~~the ~~Exhibits~~Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

~~(d) Exhibits.~~EATON VANCE MUNICIPAL BOND FUND

Exhibit Number	Description
5.03	Amendment No. 1 to the Amended and Restated Bylaws of the Fund, effective as of October 10, 2024

By: /s/ Deidre E. Walsh

~~SIGNATURE~~Name: Deidre E. Walsh

~~Pursuant to~~Title: Vice ~~the~~President ~~requirements~~& ~~of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the~~Chief ~~undersigned~~Legal ~~hereunto duly authorized.~~Officer

~~EATON~~Date: August ~~VANCE~~14, ~~MUNICIPAL BOND FUND~~2025

By: /s/ Deidre E. Walsh

Name: Deidre E. Walsh

Title: Vice President & Chief Legal Officer

Date: October 10, 2024

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