# EDGAR Filing Document

**Accession Number:** 0000356349
**File Stem:** 0000912938-23-000225
**Filing Date:** 2023-2
**Character Count:** 34304
**Document Hash:** 1b622c0b717c2e66a56a5edb63d1e873
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-23-000225.hdr.sgml**: 20230209

**ACCESSION NUMBER**: 0000912938-23-000225

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230209

**DATE AS OF CHANGE**: 20230209

**EFFECTIVENESS DATE**: 20230209

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST XIII
- **CENTRAL INDEX KEY:** 0000356349
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-74959
- **FILM NUMBER:** 23601365

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 18006372929

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS GOVERNMENT SECURITIES FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS GOVERNMENT GUARANTEED SECURITIES TRUST
- **DATE OF NAME CHANGE:** 19910522

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WORKING CAPITAL TRUST
- **DATE OF NAME CHANGE:** 19840529

## Series and Classes Contracts Data

### MFS Diversified Income Fund (Series ID: S000012219)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000033358 | A            | DIFAX           |
| C000033359 | C            | DIFCX           |
| C000033360 | I            | DIFIX           |
| C000068409 | R1           | DIFDX           |
| C000068410 | R2           | DIFEX           |
| C000068411 | R3           | DIFFX           |
| C000068412 | R4           | DIFGX           |
| C000117928 | R6           | DIFHX           |

![](image0.jpg)

SUMMARY PROSPECTUS

*June 28, 2022 (As Amended August 1, 2022, January 24, 2023, and February 9, 2023)* 

## MFS<sup>®</sup> Diversified Income Fund

------

**Before you invest**, you may want to review the fund's prospectus, which contains more information about the fund and its risks. You can find the fund's prospectus and other information about the fund, including the fund's reports to shareholders and statement of additional information, online at funds.mfs.com. You can also get this information at no cost by calling 1-800-225-2606 or by sending an e-mail request to orderliterature@mfs.com. The fund's prospectus and statement of additional information, both dated June 28, 2022, as may be amended or supplemented from time to time, are incorporated by reference into this summary prospectus.

---

| | |
|:---|:---|
| &nbsp;&nbsp; **CLASS** | **TICKER SYMBOL** |
| &nbsp;&nbsp; **Class A** | DIFAX |
| &nbsp;&nbsp; **Class C** | DIFCX |
| &nbsp;&nbsp; **Class I** | DIFIX |
| &nbsp;&nbsp; **Class R1** | DIFDX |
| &nbsp;&nbsp; **Class R2** | DIFEX |
| &nbsp;&nbsp; **Class R3** | DIFFX |
| &nbsp;&nbsp; **Class R4** | DIFGX |
| &nbsp;&nbsp; **Class R6** | DIFHX |

---

#### Summary of Key Information

#### Investment Objective
The fund's investment objective is to seek total return with an emphasis on current income, but also considering capital appreciation.

#### Fees and Expenses
This table describes the fees and expenses that you may pay when you buy, hold, and sell shares of the fund. Investors may also pay commissions or other fees to their financial intermediaries when they buy, hold, and sell shares of the fund, which are not reflected below. Expenses have been adjusted to reflect current fee arrangements.

You may qualify for sales charge reductions if, with respect to Class A shares, you and certain members of your family invest, or agree to invest in the future, at least $100,000 in MFS funds. More information about these and other waivers and reductions is available from your financial intermediary and in "Sales Charges and Waivers and Reductions" on page 14 and "Appendix A – Waivers and Reductions of Sales Charges" on page A-1 of the fund's prospectus.

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** | **Shareholder Fees (fees paid directly from your investment):** |
| **Share Class** | **A** | **C** | **I** | **R1** | **R2** | **R3** | **R4** | **R6** |
| **Maximum Sales Charge** (Load)<br> Imposed on Purchases (as a percentage of offering price) | 4.25% |  |  |  |  |  |  |  |
| **Maximum Deferred Sales Charge** (Load)<br> (as a percentage of original purchase price or redemption proceeds, whichever is less) | 1.00%<sup>#</sup> | 1.00% |  |  |  |  |  |  |

---

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** | **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** |
| **Share Class** | **A** | **C** | **I** | **R1** | **R2** | **R3** | **R4** | **R6** |
| Management Fee | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% |
| Distribution and/or Service (12b-1) Fees | 0.25% | 1.00% |  | 1.00% | 0.50% | 0.25% |  |  |
| Other Expenses | <u>0.14%</u> | <u>0.14%</u> | <u>0.14%</u> | <u>0.14%</u> | <u>0.14%</u> | <u>0.14%</u> | <u>0.14%</u> | <u>0.05%</u> |
| Total Annual Fund Operating Expenses | 0.94% | 1.69% | 0.69% | 1.69% | 1.19% | 0.94% | 0.69% | 0.60% |
| Fee Reductions and/or Expense Reimbursements<sup>1</sup> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> | <u>(0.05)%</u> |
| Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements | 0.89% | 1.64% | 0.64% | 1.64% | 1.14% | 0.89% | 0.64% | 0.55% |

---

# This contingent deferred sales charge (CDSC) applies to shares purchased without an initial sales charge and redeemed within 18 months of purchase.

---

| | |
|:---|:---|
| 1 | Massachusetts Financial Services Company has agreed in writing to bear the fund's expenses, excluding interest, taxes, extraordinary expenses, brokerage and transaction costs, certain tax reclaim recovery expenses (including contingency fees and closing agreement expenses), and investment-related expenses (such as interest and borrowing expenses incurred in connection with the fund's investment activity), such that "Total Annual Fund Operating Expenses" do not exceed 0.89% of the class' average daily net assets annually for each of Class A and Class R3 shares, 1.64% of the class' average daily net assets annually for each of Class C and Class R1 shares, 0.64% of the class' average daily net assets annually for each of Class I and Class R4 shares, 1.14% of the class' average daily net assets annually for Class R2 shares, and 0.55% of the class' average daily net assets annually for Class R6 shares. This written agreement will continue until modified by the fund's Board of Trustees, but such agreement will continue until at least June 30, 2024. |

---

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#### MFS Diversified Income Fund

#### Example
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that: you invest $10,000 in the fund for the time periods indicated and you redeem your shares at the end of the time periods (unless otherwise indicated); your investment has a 5% return each year; and the fund's operating expenses remain the same.

Although your actual costs will likely be higher or lower, under these assumptions your costs would be:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **1 YEAR** | **3 YEARS** | **5 YEARS** | **10 YEARS** |
| **Class A** Shares | $512 | $702 | $913 | $1522 |
| **Class C** Shares assuming<sup>1</sup> |  |  |  |  |
| &nbsp;&nbsp;&nbsp; redemption at end of period | $267 | $523 | $908 | $1790 |
| &nbsp;&nbsp;&nbsp; no redemption at end of period | $167 | $523 | $908 | $1790 |
| **Class I** Shares | $65 | $210 | $374 | $849 |
| **Class R1** Shares | $167 | $523 | $908 | $1989 |
| **Class R2** Shares | $116 | $368 | $644 | $1434 |
| **Class R3** Shares | $91 | $289 | $510 | $1145 |
| **Class R4** Shares | $65 | $210 | $374 | $849 |
| **Class R6** Shares | $56 | $182 | $325 | $740 |

---

1 Shares automatically convert to Class A shares approximately eight years after purchase; therefore, the expense examples reflect Class A share expenses after eight years.

#### Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These transaction costs, which are not reflected in "Annual Fund Operating Expenses" or in the "Example," affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 72% of the average value of its portfolio.

#### Principal Investment Strategies
MFS (Massachusetts Financial Services Company, the fund's investment adviser) normally invests the fund's assets primarily in a broad range of debt instruments and equity securities of U.S. and foreign issuers, including real estate-related investments and emerging market securities.

MFS allocates the fund's assets across the following categories based on its interpretation of economic and money market conditions, fiscal and monetary policy and asset class and/or security values. When MFS' assessment of the relative attractiveness of these categories is neutral, the fund's exposure to these categories is expected to be approximately:

---

| | |
|:---|:---|
| **Category** | **Neutral Position** |
| Investment Grade Quality Debt Instruments | 15% |
| Lower Quality Debt Instruments | 25% |
| U.S. Government Securities | 10% |
| Emerging Market Debt Instruments | 15% |
| Dividend-Paying Equity Securities | 20% |
| Real Estate-Related Investments | 15% |

---

These allocations may vary significantly from time to time.

For the debt instrument portion of the fund, MFS normally focuses on investing the fund's assets in investment grade quality corporate bonds, U.S. Government securities, below investment grade quality debt instruments of developed market issuers, and debt instruments of emerging market issuers (including below investment grade quality debt instruments of emerging market issuers). Of the fund's investments in debt instruments, MFS may invest up to 100% of these investments in below investment grade quality debt instruments. MFS may purchase or sell securities for the fund on a when-issued, delayed delivery, or forward commitment basis where payment and delivery take place at a future settlement date, including mortgage-backed securities purchased or sold in the to be announced (TBA) market.

For the equity portion of the fund, MFS focuses on investing the fund's assets in dividend-paying stocks of U.S. and foreign issuers. In selecting equity investments for the fund, MFS is not constrained by any particular investment style. MFS may invest the fund's assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies), in the stocks of companies it believes are undervalued compared to their perceived worth (value companies), or in a combination of growth and value companies. While MFS may invest the equity portion of the fund's assets in securities of companies of any size, MFS primarily invests in securities of companies with large capitalizations.

For the real estate-related portion of the fund, MFS invests the fund's assets in real estate investment trusts (REITs) and other companies principally engaged in the real estate industry. MFS generally focuses the fund's real estate-related investments in equity REITs, but may also invest in mortgage REITs and other real estate-related investments. Issuers of real estate-related investments tend to have small-to-medium market capitalizations.

MFS normally invests the fund's assets across different industries, sectors, countries, and regions, but MFS may invest a significant percentage of the fund's assets in issuers in a single industry, sector, country, or region.

While MFS may use derivatives for any investment purpose, to the extent MFS uses derivatives, MFS expects to use derivatives primarily to increase or decrease exposure to a particular market, segment of the market, or security, to increase or decrease interest rate or currency exposure, or as alternatives to direct investments. Derivatives include futures, forward contracts, options, and swaps.

MFS uses an active bottom-up investment approach to buying and selling investments for the fund. For the debt and real estate-related portions of the fund, investments are selected primarily based on fundamental analysis of individual issuers and instruments. For the equity portion of the fund, investments are selected primarily based on blending fundamental and quantitative research and then constructing a portfolio of equity securities while managing various risk factors (e.g., issuer, industry, and sector weightings, market capitalization, and volatility). Quantitative models that systematically evaluate issuers and instruments are used by the fund's equity securities portfolio manager and may also be considered by the fund's other portfolio managers.

MFS may invest the fund's assets in other mutual funds advised by MFS that invest in particular investment types rather than invest directly in such investments.

#### Principal Risks
As with any mutual fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

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MFS Diversified Income Fund

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The principal risks of investing in the fund are:

**Allocation Risk:** MFS' assessment of the risk/return potential of asset classes and the resulting allocation among asset classes may not produce the intended results and/or can lead to an investment focus that results in the fund underperforming other funds with similar investment strategies and/or underperforming the markets in which the fund invests.

**Investment Selection Risk:** MFS' investment analysis, its development and use of quantitative models, and its selection of investments may not produce the intended results and/or can lead to an investment focus that results in the fund underperforming other funds with similar investment strategies and/or underperforming the markets in which the fund invests. The quantitative models used by MFS (both proprietary and third-party) may not produce the intended results for a variety of reasons, including the factors used in the models, the weight placed on each factor in the models, changes from the market factors' historical trends, changing sources of market return or market risk, and technical issues in the design, development, implementation, application, and maintenance of the models (e.g., incomplete, stale, or inaccurate data, programming or other software issues, coding errors, and technology failures).

**Debt Market Risk:** Debt markets can be volatile and can decline significantly in response to, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These conditions can affect a single instrument, issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.

**Interest Rate Risk:** In general, the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest rate risk is generally greater for instruments with longer maturities, or that do not pay current interest.

**Credit Risk:** The price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty, or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument. The price of a debt instrument can decline in response to changes in, or perceptions of, the financial condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets, or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.

Below investment grade quality debt instruments (commonly referred to as "high yield securities" or "junk bonds") can involve a substantially greater risk of default or can already be in default, and their values can decline significantly. Below investment grade quality debt instruments are regarded as having predominantly speculative characteristics. Below investment grade quality debt instruments tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.

**Foreign Risk:** Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These factors can make foreign investments, especially those tied economically to emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market.

**Emerging Markets Risk:** Investments tied economically to emerging markets, especially frontier markets, can involve additional and greater risks than the risks associated with investments in developed markets. Emerging markets can have less developed markets, greater custody and operational risk, less developed legal, regulatory, and accounting systems, greater government involvement in the economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater political, social, geopolitical, and economic instability than developed markets.

**Focus Risk:** Issuers in a single industry, sector, country, or region can react similarly to market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other conditions, and the fund's performance will be affected by the conditions in the industries, sectors, countries and regions to which the fund is exposed.

**Currency Risk:** The value of foreign currencies relative to the U.S. dollar fluctuates in response to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions, and changes in currency exchange rates impact the financial condition of companies or other issuers and may change the value in U.S. dollars of investments denominated in foreign currencies.

**Prepayment/Extension Risk:** Instruments subject to prepayment and/or extension can reduce the potential for gain for the instrument's holders if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is extended.

**Equity Market Risk/Company Risk:** Equity markets are volatile and can decline significantly in response to, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the equity markets in general. Certain events can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an equity market or a segment of an equity market. The value of an investment held by the fund may decline due to factors directly related to the issuer.

**Real Estate-Related Investment Risk:** The risks of investing in real estate-related securities include certain risks associated with the direct ownership of real estate and the real estate industry in general. These include risks related to general, regional and local economic conditions; difficulties in valuing and disposing of real estate; fluctuations in interest rates and property tax rates; shifts in zoning laws, environmental regulations and other governmental action; cash flow dependency; increased operating expenses; lack of availability of mortgage funds; losses due to natural disasters; overbuilding; losses due to casualty or condemnation; changes in property values and rental rates; the management skill and creditworthiness of the REIT manager; and other factors. The securities of smaller real estate-related issuers can be more volatile and less liquid than securities of larger issuers and their issuers can have more limited financial resources.

**Derivatives Risk:** Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives can be substantially greater than the derivatives' original cost. Derivatives can involve leverage.

**When-Issued, Delayed Delivery, and Forward Commitment Transaction Risk:** The purchaser in a when-issued, delayed delivery or forward commitment transaction assumes the rights and risks of ownership, including the risks of price and yield fluctuations and the risk that the security will not be issued or delivered as anticipated. When-issued, delayed delivery, and forward commitment transactions can involve leverage.

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MFS Diversified Income Fund

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**Leveraging Risk:** Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.

**Counterparty and Third Party Risk:** Transactions involving a counterparty or third party other than the issuer of the instrument are subject to the credit risk of the counterparty or third party, and to the counterparty's or third party's ability or willingness to perform in accordance with the terms of the transaction.

**Liquidity Risk:** It may be difficult to value, and it may not be possible to sell, certain investments, types of investments, and/or investments in certain segments of the market, and the fund may have to sell certain of these investments at prices or times that are not advantageous in order to meet redemptions or other cash needs.

**Large Shareholder Risk:** From time to time, shareholders of the fund (which may include institutional investors, financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund shares. These transactions may cause the fund to sell securities or invest additional cash, as the case may be, at disadvantageous prices. Redemptions of a large number of shares also may increase transaction and other costs or have adverse tax consequences for shareholders of the fund by requiring a sale of portfolio securities. Purchases of a large number of shares may adversely affect the fund's performance to the extent that it takes time to invest new cash and the fund maintains a larger cash position than it ordinarily would.

#### Performance Information
The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund's performance over time and how the fund's performance over time compares with that of a broad measure of market performance and one or more other measures of performance for markets in which the fund may invest.

Performance information prior to June 15, 2021, reflects time periods when the fund did not have an investment strategy of allocating a portion of its assets to investment grade quality debt instruments. The fund's investment strategies changed effective June 15, 2021. The fund's past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. Updated performance is available online at **mfs.com** or by calling 1-800-225-2606.

**Class A Bar Chart.** The bar chart does not take into account any sales charges (loads) that you may be required to pay upon purchase or redemption of the fund's shares. If these sales charges were included, they would reduce the returns shown.

![](image00001.jpg)

The total return for the three-month period ended March 31, 2022, was (4.41)%. During the period(s) shown in the bar chart, the highest quarterly return was 8.65% (for the calendar quarter ended June 30, 2020) and the lowest quarterly return was (13.45)% (for the calendar quarter ended March 31, 2020).

#### Performance Table.

---

| |
|:---|
| **Average Annual Total Returns** |
| (For the Periods Ended December 31, 2021) |

---

---

| | | | |
|:---|:---|:---|:---|
| **Share Class** | **1 YEAR** | **5 YEARS** | **10 YEARS** |
| **Returns Before Taxes** | **Returns Before Taxes** | **Returns Before Taxes** | **Returns Before Taxes** |
| **C Shares** | 7.49% | 5.71% | 6.24% |
| **I Shares** | 9.50% | 6.77% | 7.13% |
| **R1 Shares** | 8.50% | 5.73% | 6.08% |
| **R2 Shares** | 9.03% | 6.24% | 6.61% |
| **R3 Shares** | 9.30% | 6.50% | 6.87% |
| **R4 Shares** | 9.57% | 6.77% | 7.14% |
| **R6 Shares** | 9.67% | 6.88% | 7.23% |
| **A Shares** | 4.66% | 5.60% | 6.41% |
| **Returns After Taxes on Distributions** |  |  |  |
| A Shares | 3.00% | 4.23% | 4.91% |
| **Returns After Taxes on Distributions and Sale of Fund Shares** |  |  |  |
| A Shares | 3.15% | 3.82% | 4.48% |
| **Index Comparisons (Reflects no deduction for fees, expenses, or taxes)** |  |  |  |
| Standard & Poor's 500 Stock Index | 28.71% | 18.47% | 16.55% |
| MFS Diversified Income Fund Blended Index | 10.65% | 6.82% | 6.77% |
| Bloomberg U.S. Corporate High-Yield 2% Issuer Capped Index | 5.26% | 6.28% | 6.82% |
| Bloomberg U.S. Credit Index | (1.08)% | 5.05% | 4.45% |
| Bloomberg U.S. Government/Mortgage Index | (1.77)% | 2.85% | 2.21% |
| JPMorgan Emerging Markets Bond Index Global | (1.51)% | 4.47% | 4.95% |
| MSCI All Country World High Dividend Yield Index (net div) | 14.28% | 9.72% | 8.53% |
| MSCI US REIT Index (net div) | 41.71% | 9.46% | 9.99% |

---

As of December 31, 2021, the MFS Diversified Income Fund Blended Index (the Blended Index) consisted of the following indices and weightings: 15% MSCI US REIT Index; 15% JPMorgan Emerging Markets Bond Index Global; 10% Bloomberg U.S. Government/Mortgage Index; 25% Bloomberg U.S. Corporate High-Yield 2% Issuer Capped Index; 20% MSCI All Country World (ACWI) High Dividend Yield Index; and 15% Bloomberg U.S. Credit Index. The components and weightings of the Blended Index may have differed during the periods, and may differ in the future.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. The after-tax returns are shown for only one of the fund's classes of shares, and after-tax returns for the fund's other classes of shares will vary from the

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MFS Diversified Income Fund

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returns shown.

#### Investment Adviser
MFS serves as the investment adviser for the fund.

#### Portfolio Manager(s)

---

| | | |
|:---|:---|:---|
| **&nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager** | **Since** | &nbsp;&nbsp;&nbsp; **Title** |
| &nbsp;&nbsp; Robert Almeida | 2018 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Neeraj Arora | 2019 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; David Cole | 2006 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Rick Gable | 2006 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Alexander Mackey | 2021 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; John Mitchell | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;January 20, 2023 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Matt Ryan | 2006 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Jonathan Sage | 2006 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Geoffrey Schechter | 2006 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Michael Skatrud | 2018 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |

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Effective April 30, 2024, Matt Ryan will no longer be a portfolio manager of the fund.

#### Purchase and Sale of Fund Shares
You may purchase and redeem shares of the fund each day the New York Stock Exchange (the NYSE) is open for trading. You may purchase or redeem shares either by having your financial intermediary process your purchase or redemption, or through MFS Service Center, Inc. (MFSC) by overnight mail (MFSC, Suite 219341, 430 W 7<sup>th</sup> Street, Kansas City, MO 64105-1407), by mail ([Fund Name], P.O. Box 219341, Kansas City, MO 64121-9341), by telephone (1-800-225-2606), or via the Internet at **mfs.com** (MFS Access).

The fund's initial and subsequent investment minimums generally are as follows:

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| | | |
|:---|:---|:---|
| &nbsp;&nbsp; **Class**<br>&nbsp;&nbsp; Class A, Class C | &nbsp;&nbsp;&nbsp; **Initial Minimum**<br>&nbsp;&nbsp;&nbsp;&nbsp; **None** – automatic investment plans and certain asset-based fee programs<br> **$25** – employer-sponsored retirement plans<br> **$250** – Traditional and Roth IRAs<br> **$1,000** – other accounts | &nbsp;&nbsp;&nbsp; **&nbsp;&nbsp;&nbsp;&nbsp;Subsequent Minimum**<br>&nbsp;&nbsp;&nbsp;&nbsp; **$50** – by check and non-systematic written exchange request, and via MFSC telephone representatives<br> **None** – other purchases |
| &nbsp;&nbsp; Class I, Class R1, Class R2, Class R3, Class R4, Class R6 |  |  |

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#### Taxes
If your shares are held in a taxable account, the fund's distributions will be taxed to you as ordinary income and/or capital gains. If your shares are held in a tax-advantaged account, you will generally be taxed only upon withdrawals from the account.

#### Payments to Broker/Dealers and Other Financial Intermediaries
If you purchase shares of the fund through a broker/dealer or other financial intermediary (such as a bank), the fund, MFS, and/or MFS' affiliates may pay the financial intermediary for the sale of shares of the fund and/or the servicing of shareholder accounts. These payments may create a conflict of interest by influencing your broker/dealer or other financial intermediary and your salesperson to recommend the fund over another investment. Ask your financial intermediary or visit your financial intermediary's website for more information.

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