# EDGAR Filing Document

**Accession Number:** 0000847411
**File Stem:** 0000930413-26-000672
**Filing Date:** 2026-3
**Character Count:** 15083
**Document Hash:** eeb64635c0fe0e0a3938f62c77fe50e9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000930413-26-000672.hdr.sgml**: 20260304

**ACCESSION NUMBER**: 0000930413-26-000672

**CONFORMED SUBMISSION TYPE**: SC TO-C

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260304

**DATE AS OF CHANGE**: 20260304

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS INVESTMENT GRADE MUNICIPAL TRUST
- **CENTRAL INDEX KEY:** 0000847411

**ORGANIZATION NAME:**
- **EIN:** 043046360
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** SC TO-C
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-84342
- **FILM NUMBER:** 26721475

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COLONIAL INVESTMENT GRADE MUNICIPAL TRUST
- **DATE OF NAME CHANGE:** 19920703
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS INVESTMENT GRADE MUNICIPAL TRUST
- **CENTRAL INDEX KEY:** 0000847411

**ORGANIZATION NAME:**
- **EIN:** 043046360
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** SC TO-C

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COLONIAL INVESTMENT GRADE MUNICIPAL TRUST
- **DATE OF NAME CHANGE:** 19920703

**united states<br> SECURITIES AND EXCHANGE COMMISSION<br> WASHINGTON, D.C. 20549**

**SCHEDULE TO**

**TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1)<br> OF THE SECURITIES EXCHANGE ACT OF 1934**

**MFS Investment Grade Municipal Trust**

(Name of Subject Company (Issuer))

MFS Investment Grade Municipal Trust<br> (Name of Filing Person (Issuer))

Common Shares, Without Par<br> (Title of Class of Securities)

59318B108<br> (CUSIP Number of Class of Securities)

Christopher R. Bohane<br> Massachusetts Financial Services Company<br> 111 Huntington Avenue<br> Boston, MA 02199<br> Telephone: (617) 954-5000

(Name, address and telephone number of person authorized to receive notices and communications on behalf of filing persons)

*With a Copy to:*

David C. Sullivan<br> Ropes & Gray LLP<br> Prudential Tower<br> 800 Boylston Street<br> Boston, MA 02199-3600<br> Telephone: (617) 951-7000

**Calculation of Filing Fee**

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| | |
|:---|:---|
| **Transaction Valuation\*** | **Amount of Filing Fee\*** |
| Not Applicable | Not Applicable |

---

\* No filing fee is required because this filing includes only preliminary communications made before the commencement of a tender offer.

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

---

| | |
|:---|:---|
| Amount Previously Paid: Not Applicable | Filing Party: Not Applicable |
| Form or Registration No.: Not Applicable | Date Filed: Not Applicable |

---

&nbsp;&nbsp;&nbsp;&nbsp;☒ Check
 the box if the filing relates solely to preliminary communications made before the commencement
 of a tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

☐ third party tender offer subject to Rule 14d-1.

☒ issuer tender offer subject to Rule 13e-4.

☐ going-private transaction subject to Rule 13e-3.

☐ amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer. ☐

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

☐ Rule 13e-4(i) (Cross-Border Issuer Tender Offer) <br> ☐ Rule 14d-1(d) (Cross-Border Third-Party Tender Offer)

**explanatory note**

This filing relates solely to preliminary communications made before the commencement of a tender offer (the "Offer") by MFS Investment Grade Municipal Trust, a closed-end management investment company (the "Fund"), to purchase for cash up to 50% of the Fund's outstanding common shares (the "Shares") upon the terms and subject to the conditions of the Offer.

**Forward-Looking Statements**

This document contains statements regarding plans and expectations for the future that constitute forward-looking statements within The Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact are forward-looking and can be identified by the use of words such as "may," "will," "expect," "anticipate," "estimate," "believe," "continue," or other similar words. Such forward-looking statements are based on the Fund's current plans and expectations, are not guarantees of future results or performance, and are subject to risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. All forward-looking statements are as of the date of this release only; the Fund undertakes no obligation to update or review any forward-looking statements. You are urged to carefully consider all such factors.

**Additional Information and Where to Find It**

The Offer referenced in this communication has not yet commenced. This announcement is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer to sell Shares in the Fund, nor is it a solicitation of any proxy. This announcement is not a substitute for any materials that the Fund will file with the SEC.

The Fund plans to file a tender offer statement on Schedule TO, together with other related tender offer documents, including a letter of transmittal, in connection with the Offer. These documents will contain important information about the Fund and the Offer. You are urged to read these documents carefully and in their entirety when they become available before making any decision regarding tendering your Shares. These documents will be made available to the Fund's shareholders at no expense to them and will also be available for free at the SEC's website at <u>www.sec.gov</u>.

This Schedule TO is not a prospectus, circular, or representation intended for use in the purchase or sale of Shares in the Fund. Shares of the Fund are not FDIC-insured and are not deposits or other obligations of, or guaranteed by, any bank. Shares of the Fund involve investment risk, including possible loss of principal. For more complete information about the Fund, including risks, charges, and expenses, please see the Fund's annual and semi-annual shareholder reports. You may read and copy any reports or other such filed information at the SEC public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the public reference room. The Fund's filings with the SEC are also available to the public from commercial document-retrieval services and at the website maintained by the SEC at <u>www.sec.gov</u>.

The Fund is a closed-end fund. Common shares of the Fund are only available for purchase/sale on the New York Stock Exchange at the current market price. Common shares may trade at a discount to net asset value.

**Items 1-11.**

Not applicable.

**Item 12. EXHIBITS.**

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**Exhibit No.** | **Document** |
| &nbsp;&nbsp;&nbsp;99.1 | [Press Release issued by the Issuer dated March 4, 2026](c115730_ex99-1.htm) |

---

**Item 13.**

Not applicable.

## Exhibit 99.1

**Exhibit 99.1**

![](x1_c115730x5x1.jpg)

---

| | |
|:---|:---|
| **For Immediate Release** | **Media contacts: <u>Dan Flaherty,</u> +1 617.954.4256** |
|  | **For shareholders/advisors: <u>Brian Mastrullo,</u> +1 617.954.7940** |

---

**MFS INVESTMENT GRADE MUNICIPAL TRUST ANNOUNCES TENDER OFFER**

**BOSTON, MA (March 4, 2026) –** MFS Investment Management® (MFS®) announced today that the Board of Trustees (the "Board") of MFS Investment Grade Municipal Trust (the "Fund") (NYSE: CXH), a closed-end management investment company, authorized the Fund to conduct a cash tender offer (the "Tender Offer") for up to 50% of the Fund's outstanding common shares (the "Shares") at a price per Share equal to 99% of the Fund's net asset value ("NAV") per Share as of the close of regular trading on the New York Stock Exchange ("NYSE") on the date the Tender Offer expires. The Board approved the Tender Offer to, among other reasons, encourage shareholder support for the Fund's previously announced reorganization with and into the MFS Municipal Income Trust (the "Acquiring Fund") (the "Reorganization"), and to provide shareholders with a source of liquidity ahead of the Reorganization.

As of February 27, 2026, the Fund had 8,199,220 shares of common stock outstanding, 372 shares of preferred stock outstanding, and total net assets of $71.60 million (not including preferred shares).

*Tender Offer Conditions* 

The Tender Offer is being made on the terms and subject to the conditions that will be set forth in the Fund's tender offer statement on Schedule TO (including an offer to purchase, a related letter of transmittal and other offer documents) that will be filed with the U.S. Securities and Exchange Commission (the "SEC") upon the commencement of the Tender Offer. Among other conditions, the Tender Offer is contingent upon the Fund receiving the necessary shareholder vote in favor of the Reorganization. Further details regarding the Reorganization are discussed in a joint prospectus/proxy statement dated January 29, 2026, and mailed to the Fund's shareholders in February 2026. The Reorganization will be voted upon at a special shareholder meeting scheduled for March 11, 2026, which may be subject to one or more adjournments (the "Meeting"). The Tender Offer will commence as soon as practical after the Meeting if the Reorganization is approved and prior to the consummation of the Reorganization, which is currently anticipated to occur on or around June 1, 2026. Further details and timing of the Tender Offer will be announced following the Meeting.

**In the event that the Reorganization is not approved at the Meeting, the Tender Offer will not be conducted.**

Additional terms and conditions of the Tender Offer will be set forth in the Fund's offering materials filed with the SEC. If the number of Shares tendered exceeds the maximum amount of the Tender Offer, the Fund will purchase shares from tendering shareholders on a pro-rata basis. Accordingly, there is no assurance that the Fund will purchase all of a shareholder's tendered

common shares. The Fund may determine not to accept shares tendered in the Tender Offer under various circumstances, as will be set forth in the offering materials.

Further information about the Tender Offer will be announced in future press releases and the Fund's offering materials. This announcement is for informational purposes only and is not a recommendation, an offer to purchase, or a solicitation of an offer to sell shares of the Fund and is not a prospectus, circular or representation intended for use in the purchase or sale of Fund shares. The Fund has not yet commenced the Tender Offer described in this release. A Tender Offer will be made only by an offer to purchase, a related letter of transmittal, and other documents that will be filed with the SEC as exhibits to a tender offer statement on Schedule TO and will be available free of charge at the SEC's website at <u>www.sec.gov</u>. Shareholders should read the applicable offer to purchase and tender offer statement on Schedule TO and related exhibits if and when those documents are filed and become available, as they will contain important information about the particular Tender Offer. The Fund will also make available, without charge, the offer to purchase and the letter of transmittal for the Tender Offer that is conducted.

**<u>Cautionary Statement Regarding Forward-Looking Statements</u>**

This press release may contain statements regarding plans and expectations for the future that constitute forward-looking statements within The Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact are forward-looking and can be identified by the use of words such as "may," "will," "expect," "anticipate," "estimate," "believe," "continue," or other similar words. Such forward-looking statements are based on the Fund's current plans and expectations, are not guarantees of future results or performance, and are subject to risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. All forward-looking statements are as of the date of this release only; the Fund undertakes no obligation to update or review any forward-looking statements. You are urged to carefully consider all such factors.

**<u>About the Fund</u>**

The Fund is a closed-end investment company product advised by MFS Investment Management. Closed end funds, unlike open end funds, are not continuously offered. Except pursuant to a Tender Offer, common shares of the Fund are only available for purchase/sale on the NYSE at the current market price. Shares may trade at a discount to NAV. Shares of the Fund are not FDIC-insured and are not deposits or other obligations of, or guaranteed by, any bank. Shares of the Fund involve investment risk, including possible loss of principal. For more complete information about the Fund, including risks, charges, and expenses, please see the Fund's annual and semi-annual shareholder reports or contact your financial adviser.

**<u>About MFS Investment Management</u>**

In 1924, MFS launched the first U.S. open end mutual fund, opening the door to the markets for millions of everyday investors. Today, as a full-service global investment manager serving financial advisors, intermediaries, and institutional clients, MFS still serves a single purpose: to create long-term value for clients by allocating capital responsibly. That takes our powerful investment approach combining collective expertise, thoughtful risk management and long-term discipline. Supported by our culture of shared values and collaboration, our teams of diverse

thinkers actively debate ideas and assess material risks to uncover what we believe are the best investment opportunities in the market. As of January 31, 2026, MFS managed $661.8 billion in assets on behalf of individual and institutional investors worldwide. Please visit mf**s**.com for more information.

**MFS Investment Management**

**111 Huntington Ave., Boston, MA 02199**

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