# EDGAR Filing Document

**Accession Number:** 0000851170
**File Stem:** 0000897101-26-000068
**Filing Date:** 2026-2
**Character Count:** 17736
**Document Hash:** 6f854a37912c6325d21814941592d739
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000897101-26-000068.hdr.sgml**: 20260224

**ACCESSION NUMBER**: 0000897101-26-000068

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 6

**FILED AS OF DATE**: 20260224

**DATE AS OF CHANGE**: 20260224

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS CHARTER INCOME TRUST
- **CENTRAL INDEX KEY:** 0000851170

**ORGANIZATION NAME:**
- **EIN:** 043055815
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-81425
- **FILM NUMBER:** 26672957

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 18006372929

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS PRINCIPAL INCOME TRUST
- **DATE OF NAME CHANGE:** 19890906
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SIT INVESTMENT ASSOCIATES INC
- **CENTRAL INDEX KEY:** 0000769317

**ORGANIZATION NAME:**
- **EIN:** 411404829
- **STATE OF INCORPORATION:** MN
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**BUSINESS ADDRESS:**
- **STREET 1:** 3300 IDS CENTER
- **STREET 2:** 80 SOUTH EIGHTH STREET
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55402
- **BUSINESS PHONE:** 6123323223

**MAIL ADDRESS:**
- **STREET 1:** 3300 IDS CENTER
- **STREET 2:** 80 SOUTH EIGHTH STREET
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55402

## Ex-99.A

EXHIBIT A

Schedule of Transactions in Shares by Sit Entities during the past 60 days:

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;Date of Transaction | &nbsp;&nbsp;Transaction | &nbsp;&nbsp;Shares of Common Stock | &nbsp;&nbsp;Price Per Share ($) |
| &nbsp;&nbsp;12/26/2025 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;18196 | &nbsp;&nbsp;6.35 |
| &nbsp;&nbsp;12/29/2025 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;19363 | &nbsp;&nbsp;6.31 |
| &nbsp;&nbsp;12/30/2025 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;31445 | &nbsp;&nbsp;6.31 |
| &nbsp;&nbsp;12/31/2025 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;86666 | &nbsp;&nbsp;6.28 |
| &nbsp;&nbsp;1/8/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;21100 | &nbsp;&nbsp;6.28 |
| &nbsp;&nbsp;1/13/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;828 | &nbsp;&nbsp;6.32 |
| &nbsp;&nbsp;1/14/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;8153 | &nbsp;&nbsp;6.34 |
| &nbsp;&nbsp;1/16/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;972 | &nbsp;&nbsp;6.33 |
| &nbsp;&nbsp;1/20/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;1701 | &nbsp;&nbsp;6.26 |
| &nbsp;&nbsp;1/21/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;2411 | &nbsp;&nbsp;6.30 |
| &nbsp;&nbsp;1/22/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;356 | &nbsp;&nbsp;6.30 |
| &nbsp;&nbsp;1/23/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;17391 | &nbsp;&nbsp;6.30 |
| &nbsp;&nbsp;1/26/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;13649 | &nbsp;&nbsp;6.29 |
| &nbsp;&nbsp;1/27/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;17000 | &nbsp;&nbsp;6.28 |
| &nbsp;&nbsp;1/30/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;11300 | &nbsp;&nbsp;6.31 |
| &nbsp;&nbsp;2/2/2026 | &nbsp;&nbsp;BUY | &nbsp;&nbsp;10000 | &nbsp;&nbsp;6.28 |

---

## Ex-99.B

EXHIBIT B

**Joint Filing Agreement**

The undersigned agree that the statement on Schedule 13D with respect to the Common Stock of MFS Charter Income Trust, dated as of February 24, 2026, is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of them pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

IN WITNESS WHEREOF, this Agreement has been duly executed by the parties hereto as of the date first written above.

---

| | |
|:---|:---|
| By: Sit Investment Associates, Inc. | By: Sit Fixed Income Advisors II, LLC |
| /s/Roger J. Sit | /s/Roger J. Sit |
| Roger J. Sit | Roger J. Sit |
| Its: CEO | Its: CEO |

---

## Ex-99.C

EXHIBIT C

![](image_001.jpg)

February 24, 2026

Rosa E. Licea-Mailloux, Chief Compliance Officer Via FedEx

and

Heidi W. Hardin, Secretary and Clerk

Massachusetts Financial Services Company

111 Huntington Ave

Boston, MA 02199-7618

Re: MFS Charter Income Trust (MCR),

MFS Intermediate Income Trust (MIN),

MFS Multimarket Income Trust (MMT, "Acquiring Fund"),

MFS Government Markets Income Trust (MGF),

MFS Intermediate High Income Fund (CIF) (collectively the "Funds")

Dear Ms. Licea-Mailloux and Ms. Hardin:

Sit Investment Associates, Inc. and Sit Fixed Income Advisors II, LLC ("Sit" or "we" or "our") are each registered as an investment adviser with the Securities and Exchange Commission (the "Commission") under the Investment Advisers Act of 1940, as amended and act pursuant to investment management agreements as the discretionary investment manager to certain clients who are shareholders of closed-end funds ("CEFs"). Sit has been investing in CEFs on behalf of its clients for more than 25 years. Sit's clients include individuals and institutions, such as foundations, pension funds, insurance companies, and corporations. Our investment approach to CEFs is long-term orientated with an emphasis on the income component of total return. Sit utilizes CEFs across several client types and composites, each with differing objectives, guidelines, restrictions, and risk tolerances.

We are writing to notify the Funds' Board of Trustees (the "Board") that we intend to vote AGAINST the reorganization proposal announced on December 11, 2025 which would merge MCR, MIN, MGF, and CIF (the "Acquired Funds") into MMT, the Acquiring Fund.

Sit has been investing in the Funds on behalf of its clients continuously for more than 25 years. As of December 31, 2025, Sit's clients held the following positions in the Funds:

---

| | | | |
|:---|:---|:---|:---|
| | Shares | % of Share | |
| Fund | Owned by Sit Clients | Outstanding\* | Market Value |
| MGF | 8788620 | 27.0% | $26585576 |
| MIN | 29167975 | 25.6% | 76128415 |
| MCR | 3993082 | 9.6% | 25036624 |
| CIF | 1452035 | 8.1% | 2468460 |
| MMT | 642159 | 1.2% | 2986039 |

---

\*Source of Shares Outstanding: MGF, MCR, and CIF Annual Report, 11/30/2025; MIN and MMT Annual Report, 10/31/2025.

We do not support the proposed reorganization because the Acquiring Fund?s investment strategy and risk profile is materially different than the investment strategies and risk profiles of the Acquired Funds. Specifically, and most importantly, MGF and MIN are currently required to maintain significant allocations to high-quality securities. In fact, MGF is required to invest at least 80% of its net assets in government securities. In contrast, the Acquiring Fund may invest 100% of its assets in junk bonds. If approved, the proposed reorganization will significantly increase the risk for investors in MGF and MIN. Our clients cannot accept this level of increased risk. The stark contrast in risk profiles among the Funds can be seen here:

Fund Holdings as a Percentage of Net Assets

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| <u>Security Type</u> | <u>MGF</u> | <u>MIN</u> | <u>MCR</u> | <u>CIF</u> | <u>MMT</u> |
| U.S.Treasury Bond | 47.3% | 19.8% | 23.3% | 0.0% | 5.0% |
| U.S. Agency Guaranteed | 30.1% | 5.2% | 2.1% | 0.0% | 0.0% |
| Total U.S. Government | 77.4% | 25.0% | 25.4% | 0.0% | 5.0% |

---

Source: MGF, MCR, and CIF Annual Report, 11/30/2025; MIN and MMT Annual Report, 10/31/2025.

We believe that the proposed reorganization is not in the best interest of the Acquired Funds shareholders and only benefits the Funds' sponsor. We ask that the Board cancel the proposed reorganization. We

believe that the proposed reorganization is a bait and switch scheme by Massachusetts Financial Services Company. Please call me with any questions.

Sincerely,

![](image_002.jpg)

Bryce A. Doty

Senior Portfolio Manager

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**MFS CHARTER INCOME TRUST**

*(Name of Issuer)*

**Common Stock**

*(Title of Class of Securities)*

**552727109**

*(CUSIP Number)*

**Paul E. Rasmussen**<br>80 South Eighth Street<br>Suite 3300<br>Minneapolis MN 55402<br>612-332-3223

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**02/24/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **552727109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SIT INVESTMENT ASSOCIATES INC** | Name of reporting person<br>**SIT INVESTMENT ASSOCIATES INC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**MINNESOTA** | Citizenship or place of organization<br>**MINNESOTA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**4097943.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**4097943.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4097943.00** | Aggregate amount beneficially owned by each reporting person<br>**4097943.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**9.8%** | Percent of class represented by amount in Row (11)<br>**9.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **552727109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SIT FIXED INCOME ADVISORS II LLC /ADV** | Name of reporting person<br>**SIT FIXED INCOME ADVISORS II LLC /ADV** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**4097943.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**4097943.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4097943.00** | Aggregate amount beneficially owned by each reporting person<br>**4097943.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**9.8%** | Percent of class represented by amount in Row (11)<br>**9.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock

**(b) Name of Issuer:**
MFS CHARTER INCOME TRUST

**(c) Address of Issuer's Principal Executive Offices:**
111 Huntington Avenue, 24th Floor, Boston, MA, 02199

**Item 4. Purpose of Transaction**

The Sit Entities have acquired the Issuer's Shares for investment purposes, and such purchases have been made in the ordinary course of business.  The Issuer's Shares have been acquired on behalf of SIA's and SFI's clients.

In pursuing such investment purposes, the Sit Entities purchased the Shares based on the Sit Entities' belief that the Shares represented an attractive investment opportunity, and the Sit Entities may further purchase, hold, vote, trade, sell or otherwise deal in the Shares at the time, and in such manner, as they deem advisable to benefit from, among many things, changes in market prices of such Shares, the market prices of such Shares relative to the value of the Issuer's assets, changes in the Issuer's investment strategy, and composition of the Issuer's portfolio.

None of Sit Entities have any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein.

The Sit Entities intend to review their investment in the Issuer's Shares on a continuing basis and may also propose or take one or more of the actions described in subsections (a) through (j) of Item 4 of Schedule 13D, including engaging in discussions with management, the Board of Trustees and shareholders concerning, among other things, proposals of the Board of Trustees seeking approval of a reorganization, the Issuer's performance, the market prices of the Issuer's Shares relative to the value of the Issuer's assets, the Issuer's distribution rate, the Issuer's capitalization, the Issuer's investment strategy, and the Issuer's portfolio holdings.  The Sit Entities may make binding and non-binding shareholder proposals or may nominate one or more individuals as nominees for election to the Board of Trustees.

On December 11, 2025 the Board of Trustees of the Issuer and MFS Intermediate High Income Fund ("CIF"), MFS Government Markets Income Trust ("MGF") and MFS Intermediate Income Trust ("MIN") and collectively with Issuer, CIF, MGF, and MIN the "Target Funds," and each, a "Target Fund") approved a plan of reorganization between the Target Fund and MFS Multimarket Income Trust (the "Acquiring Fund"), pursuant to which if approved by shareholders the Target Fund would transfer substantially all of its assets to the Acquiring Fund, and the Acquiring Fund would assume all stated liabilities of the Target Fund, in exchange solely for newly issued shares of beneficial interest in the Acquiring Fund, which would be distributed by the Target Fund to the shareholders of the Target Fund in the form of a liquidating distribution, and the Target Fund would be liquidated, terminated and dissolved (the "Reorganization").

On February 24, 2026 the Sit Entities sent a letter to the Board of Trustees stating the Sit Entities' opposition to the proposed Reorganization, a copy of which is attached as Exhibit C and is incorporated by reference herein.

**Item 5. Interest in Securities of the Issuer**

**(a)**
See responses on each cover page of this Schedule 13D for the aggregate number of Shares and percentages of the Shares beneficially owned by each of the Reporting Persons.  The aggregate percentage of Shares reported owned by Sit Entities herein is based upon 41,688,435 Shares outstanding as of November 30, 2025, which is the total number of Shares outstanding as reported in the Issuer's Form N-CSR.

**(b)**
See responses on each cover page of this Schedule 13D for the number of Shares as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole of shared power to dispose or to direct the disposition.  Each of the Sit Entities may be deemed to have shared power to vote and dispose of such Shares. However, none of SIA's or SFI's client accounts own more than 5% of the shares outstanding, and none of SIA's or SFI's directors or executive officers own shares directly.

**(c)**
Transactions in Shares effected during the past 60 days by the Sit Entities  are set forth in Exhibit A.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Not applicable.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SIT INVESTMENT ASSOCIATES INC

**Signature:** /s/ Roger J. Sit

**Name/Title:** Roger J. Sit, Chairman & CEO

**Date:** 02/24/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SIT FIXED INCOME ADVISORS II LLC /ADV

**Signature:** /s/ Roger J. Sit

**Name/Title:** Roger J. Sit, Chairman & CEO

**Date:** 02/24/2026