N-CSR

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-03327

MFS SERIES TRUST XIII

(Exact name of registrant as specified in charter)

111 Huntington Avenue, Boston, Massachusetts 02199 (Address of principal executive offices) (Zip code)

Christopher R. Bohane

Massachusetts Financial Services Company

111Huntington Avenue Boston, Massachusetts 02199

(Name and address of agents for service)

Registrant's telephone number, including area code: (617) 954-5000

Date of fiscal year end: August 31*

Date of reporting period: August 31, 2023

*This Form N-CSR pertains only to the following series of the Registrant: MFS Global Real Estate Fund. The remaining series of the Registrant have a fiscal year end other than August 31.

ITEM 1. REPORTS TO STOCKHOLDERS.

Item 1(a):

Annual Report

August 31, 2023

MFS^® Global Real
Estate Fund

GRE-ANN

MFS^® Global Real
Estate Fund

CONTENTS

Portfolio composition	1
Management review	3
Performance summary	6
Expense table	9
Portfolio of investments	11
Statement of assets and liabilities	14
Statement of operations	16
Statements of changes in net assets	17
Financial highlights	18
Notes to financial statements	24
Report of independent registered public accounting firm	34
Trustees and officers	36
Board review of investment advisory agreement	40
Statement regarding liquidity risk management program	44
Proxy voting policies and information	45
Quarterly portfolio disclosure	45
Further information	45
Information about fund contracts and legal claims	45
Federal tax information	45
MFS® privacy notice	46

Contact information back cover

The report is prepared for the general information of shareholders. It is authorized for distribution to prospective investors only when preceded or accompanied by a current prospectus.

NOT FDIC INSURED  •  MAY LOSE VALUE  •  NO BANK GUARANTEE

Portfolio Composition

Portfolio structure

Top ten holdings

Prologis, Inc., REIT	9.6%
Equinix, Inc., REIT	6.0%
Goodman Group, REIT	3.5%
Equity Lifestyle Properties, Inc., REIT	3.0%
Extra Space Storage, Inc., REIT	2.8%
Essex Property Trust, Inc., REIT	2.5%
CapitaLand Investment Ltd.	2.4%
Grainger PLC	2.4%
Sun Communities, Inc., REIT	2.4%
AvalonBay Communities, Inc., REIT	2.3%

GICS equity sectors (g)

Real Estate	91.0%
Health Care	3.6%
Communication Services	2.9%
Financials	0.7%

Issuer country weightings (x)

United States	57.8%
United Kingdom	10.7%
Japan	7.8%
Australia	5.5%
Canada	4.0%
Singapore	3.8%
Mexico	3.0%
Germany	2.0%
Hong Kong	1.7%
Other Countries	3.7%

Currency exposure weightings (y)

United States Dollar	57.8%
British Pound Sterling	10.7%
Japanese Yen	7.8%
Australian Dollar	5.5%
Euro	5.2%
Canadian Dollar	4.0%
Singapore Dollar	3.8%
Mexican Peso	3.0%
Hong Kong Dollar	1.7%
Other Currencies	0.5%

 

(g) The Global Industry Classification Standard (GICS^®) was developed by and/or is the exclusive property of MSCI, Inc. and S&P Global Market Intelligence Inc. (“S&P Global Market Intelligence”). GICS is a service mark of MSCI and S&P Global Market Intelligence and has been licensed for use by MFS. MFS has applied its own internal sector/industry classification methodology for equity securities and non-equity securities that are unclassified by GICS.

(x) Represents the portfolio’s exposure to issuer countries as a percentage of a portfolio’s net assets. For purposes of this presentation, United States includes Cash & Cash Equivalents.

1

Portfolio Composition - continued

(y) Represents the portfolio’s exposure to a particular currency as a percentage of a portfolio's net assets. For purposes of this presentation, United States Dollar includes Cash & Cash Equivalents.

Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. Please see the Statement of Assets and Liabilities for additional information related to the fund’s cash position and other assets and liabilities.

Percentages are based on net assets as of August 31, 2023.

The portfolio is actively managed and current holdings may be different.

2

Management Review

Summary of Results 

For the twelve months ended August 31, 2023, Class A shares of the MFS Global Real Estate Fund (fund) provided a total return of -4.76%, at net asset value. This compares with a return of -5.19% for the fund’s benchmark, the FTSE EPRA Nareit Developed Real Estate Index (net div) (FTSE Index). 

Market Environment

During the reporting period, central banks around the world had to combat the strongest inflationary pressures in four decades, fueled by the global fiscal response to the pandemic, disrupted supply chains and the dislocations to energy markets stemming from the war in Ukraine. Interest rates rose substantially, but the effects of a tighter monetary policy may not have been fully experienced yet, given that monetary policy works with long and variable lags. Strains resulting from the abrupt tightening of monetary policy began to affect some parts of the economy, most acutely among small and regional US banks, which suffered from deposit flight as depositors sought higher yields on their savings. Those shifts exposed an asset-liability mismatch that forced the closure of several institutions by regulators. Given the importance of small and mid-sized lenders to the provision of credit in the US, concerns were raised in the aftermath of the crisis that credit availability could become constrained, leading to slower economic growth, although those effects have been limited thus far. China’s abandonment of its Zero-COVID policy ushered in a brief uptick in economic activity in the world’s second-largest economy in early 2023, although its momentum soon stalled as focus turned to the country’s highly-indebted property development sector. In developed markets, consumer demand for services remained stronger than the demand for goods.

Policymakers found themselves in the difficult position of trying to restrain inflation without tipping economies into recession. Despite the challenging macroeconomic and geopolitical environment, central banks remained focused on controlling price pressures while also confronting increasing financial stability concerns. Central banks had to juggle achieving their inflation mandates while using macroprudential tools to keep banking systems liquid, a potentially difficult balancing act, and one that suggested that we may be nearing a peak in policy rates.

Against an environment of relatively tight labor markets, tighter global financial conditions and volatile materials prices, investor anxiety appeared to have increased over the potential that corporate profit margins may be past peak for this cycle. That said, signs that supply chains have generally normalized, coupled with low levels of unemployment across developed markets and hopes that inflation levels have peaked, were supportive factors for the macroeconomic backdrop.

Contributors to Performance

Relative to the FTSE Index, the fund’s real estate investments within Mexico benefited performance, led by holding shares of real estate property development firm Corporacion Inmobiliaria Vesta(b) (Mexico). The stock price of Corporacion Inmobiliaria Vesta appreciated as the company delivered financial results ahead of expectations, primarily driven by strong occupancy rate and rental revenues, higher-than-anticipated land purchases in Mexico City and a solid construction pipeline.

3

Management Review - continued

Favorable stock selection and, to a lesser extent, an overweight position in real estate investments in Australia also supported relative returns, driven by the fund’s holdings of industrial property and business space management firm Goodman Group(b) (Australia).

Elsewhere, the fund’s holdings of post-acute healthcare services provider Encompass Health(b) contributed to relative returns. The stock price of Encompass Health advanced as the company’s financial results exceeded expectations, primarily driven by volume growth, cost controls and improvement in labor costs. The company also raised its fiscal year guidance, which further supported the stock. The fund’s overweight positions in property developer and manager Simon Property Group, data centers operator Equinix and real estate investment trust Phillips Edison, and not holding shares of storage facility operator Public Storage, real estate companies LinkREIT (Hong Kong) and Realty Income, and real estate investment trust Medical Properties Trust, further benefited relative performance.

During the reporting period, the fund’s relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another contributor to relative performance. All of MFS’ investment decisions are driven by the fundamentals of each individual opportunity and as such, it is common for our funds to have different currency exposure than the benchmark.

Detractors from Performance

Security selection and, to a lesser extent, an underweight position in real estate investments within Japan detracted from relative performance. Within Japan, holding shares of real estate services provider KATITAS(b) (Japan) held back relative results. The stock price of KATITAS declined as the company reported a deterioration in its gross margin due to ongoing higher materials and housing product costs.

Security selection within Hong Kong also hindered relative results, led by the fund’s holdings of industrial and logistics property manager ESR Group(b)(h) (Hong Kong). The stock price of ESR Group fell due to a slowdown in e-commerce sales, lower revenues and rising competition in the management space.

Securities in other countries that detracted from relative returns included the fund's overweight positions in real estate investment trusts, Extra Space Storage and Sun Communities, and the timing of the fund’s ownership in shares of senior housing operator Welltower(h). Additionally, holding shares of real estate investment trust SBA Communications(b), broadcast and communication tower management firm American

4

Management Review - continued

Tower(b)(h), telecommunications tower operator Helios Towers(b) (United Kingdom) and real estate investment trust Rayonier(b), and not holding shares of real estate investment trust Digital Realty Trust, further weakened the fund’s relative performance. 

Respectfully,

Portfolio Manager(s)
Rick Gable and Mark Syn

(b) Security is not a benchmark constituent.

(h) Security was not held in the portfolio at period end.

The views expressed in this report are those of the portfolio manager(s) only through the end of the period of the report as stated on the cover and do not necessarily reflect the views of MFS or any other person in the MFS organization. These views are subject to change at any time based on market or other conditions, and MFS disclaims any responsibility to update such views. These views may not be relied upon as investment advice or an indication of trading intent on behalf of any MFS portfolio. References to specific securities are not recommendations of such securities, and may not be representative of any MFS portfolio’s current or future investments.

5

Performance Summary THROUGH 8/31/23

The following chart illustrates a representative class of the fund’s historical performance in comparison to its benchmark(s). Performance results include the deduction of the maximum applicable sales charge and reflect the percentage change in net asset value, including reinvestment of dividends and capital gains distributions. The performance of other share classes will be greater than or less than that of the class depicted below. Benchmarks are unmanaged and may not be invested in directly. Benchmark returns do not reflect sales charges, commissions or expenses. (See Notes to Performance Summary.)

Performance data shown represents past performance and is no guarantee of future results. Investment return and principal value fluctuate so your shares, when sold, may be worth more or less than the original cost; current performance may be lower or higher than quoted. The performance shown does not reflect the deduction of taxes, if any, that a shareholder would pay on fund distributions or the redemption of fund shares.

Growth of a Hypothetical $10,000 Investment

6

Performance Summary  - continued

Total Returns through 8/31/23

Average annual without sales charge

Share Class	Class Inception Date	1-yr	5-yr	10-yr	Life (t)
A	3/11/09	(4.76)%	2.80%	5.89%	N/A
B	12/19/14	(5.44)%	2.05%	N/A	3.58%
C	12/19/14	(5.45)%	2.05%	N/A	3.58%
I	3/11/09	(4.57)%	3.07%	6.13%	N/A
R1	12/19/14	(5.49)%	2.04%	N/A	3.58%
R2	12/19/14	(5.03)%	2.55%	N/A	4.10%
R3	12/19/14	(4.80)%	2.80%	N/A	4.36%
R4	12/19/14	(4.47)%	3.06%	N/A	4.62%
R6	7/02/12	(4.39)%	3.16%	6.22%	N/A

Comparative benchmark(s)

FTSE EPRA Nareit Developed Real Estate Index (net div) (f) (5.19)% (0.40)% 3.26% N/A

Average annual with sales charge

A With Initial Sales Charge (5.75%)	(10.24)%	1.59%	5.26%	N/A
B With CDSC (Declining over six years from 4% to 0%) (v)	(9.04)%	1.69%	N/A	3.58%
C With CDSC (1% for 12 months) (v)	(6.35)%	2.05%	N/A	3.58%

CDSC – Contingent Deferred Sales Charge.

Class I, R1, R2, R3, R4, and R6 shares do not have a sales charge.

(f)	Source: FactSet Research Systems Inc.
(t)	For the period from the class inception date through the stated period end (for those share classes with less than 10 years of performance history). No comparative benchmark performance information is provided for “life” periods. (See Notes to Performance Summary.)
(v)	Assuming redemption at the end of the applicable period.

Benchmark Definition(s)

FTSE EPRA Nareit Developed Real Estate Index^(c) (net div) – measures the performance of eligible real estate equities worldwide that generate a majority of their revenue and income through the ownership, disposure and development of income-producing real estate.

It is not possible to invest directly in an index.

(c) FTSE International Limited (“FTSE”)^© FTSE 2019. “FTSE^®” is a trademark of the London Stock Exchange Group companies and is used by FTSE International Limited under license. “FT-SE^®”, “FOOTSIE^®” and “FTSE4GOOD^®” are trademarks of the London Stock Exchange Group companies. “Nareit^®” is a trademark of the National Association of Real Estate Investment Trusts (“Nareit”) and “EPRA^®” is a trademark of the European Public Real Estate Association (“EPRA”) and all are used by FTSE under license. The FTSE EPRA Nareit Developed Real Estate

7

Performance Summary  - continued

Index is calculated by FTSE. Neither FTSE, Euronext N.V., Nareit, nor EPRA sponsor, endorse, or promote this product and are not in any way connected to it and do not accept any liability. All intellectual property rights in the index values and constituent list vests in FTSE, Euronext N.V., Nareit, and EPRA. Neither FTSE nor its licensors accept any liability for any errors or omissions in the FTSE indices and/or FTSE ratings or underlying data. No further distribution of FTSE Data is permitted without FTSE's express written consent.

Notes to Performance Summary

Average annual total return represents the average annual change in value for each share class for the periods presented. Life returns are presented where the share class has less than 10 years of performance history and represent the average annual total return from the class inception date to the stated period end date. As the fund's share classes may have different inception dates, the life returns may represent different time periods and may not be comparable.

Performance results reflect any applicable expense subsidies and waivers in effect during the periods shown. Without such subsidies and waivers the fund's performance results would be less favorable. Please see the prospectus and financial statements for complete details.

Performance results do not include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles and may differ from amounts reported in the financial highlights.

From time to time the fund may receive proceeds from litigation settlements, without which performance would be lower.

8

Expense Table

Fund expenses borne by the shareholders during the period,
March 1, 2023 through August 31, 2023

As a shareholder of the fund, you incur two types of costs: (1) transaction costs, including sales charges (loads) on certain purchase or redemption payments, and (2) ongoing costs, including management fees; distribution and service (12b-1) fees; and other fund expenses. This example is intended to help you understand your ongoing costs (in dollars) of investing in the fund and to compare these costs with the ongoing costs of investing in other mutual funds.

The example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period March 1, 2023 through August 31, 2023.

Actual Expenses

The first line for each share class in the following table provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled “Expenses Paid During Period” to estimate the expenses you paid on your account during this period.

Hypothetical Example for Comparison Purposes

The second line for each share class in the following table provides information about hypothetical account values and hypothetical expenses based on the fund’s actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the fund’s actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as sales charges (loads). Therefore, the second line for each share class in the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds. In addition, if these transactional costs were included, your costs would have been higher.

9

Expense Table - continued

Share Class		Annualized Expense Ratio	Beginning Account Value 3/01/23	Ending Account Value 8/31/23	Expenses Paid During Period (p) 3/01/23-8/31/23
A	Actual	1.18%	$1,000.00	$983.19	$5.90
	Hypothetical (h)	1.18%	$1,000.00	$1,019.26	$6.01
B	Actual	1.93%	$1,000.00	$980.15	$9.63
	Hypothetical (h)	1.93%	$1,000.00	$1,015.48	$9.80
C	Actual	1.93%	$1,000.00	$980.10	$9.63
	Hypothetical (h)	1.93%	$1,000.00	$1,015.48	$9.80
I	Actual	0.93%	$1,000.00	$984.47	$4.65
	Hypothetical (h)	0.93%	$1,000.00	$1,020.52	$4.74
R1	Actual	1.93%	$1,000.00	$979.96	$9.63
	Hypothetical (h)	1.93%	$1,000.00	$1,015.48	$9.80
R2	Actual	1.43%	$1,000.00	$982.64	$7.15
	Hypothetical (h)	1.43%	$1,000.00	$1,018.00	$7.27
R3	Actual	1.18%	$1,000.00	$983.24	$5.90
	Hypothetical (h)	1.18%	$1,000.00	$1,019.26	$6.01
R4	Actual	0.93%	$1,000.00	$985.11	$4.65
	Hypothetical (h)	0.93%	$1,000.00	$1,020.52	$4.74
R6	Actual	0.85%	$1,000.00	$985.75	$4.25
	Hypothetical (h)	0.85%	$1,000.00	$1,020.92	$4.33

(h) 5% class return per year before expenses.

(p) “Expenses Paid During Period” are equal to each class’s annualized expense ratio, as shown above, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period).  Expenses paid do not include any applicable sales charges (loads). If these transaction costs had been included, your costs would have been higher.

10

Portfolio of Investments

8/31/23

The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes.

Issuer	Shares/Par	Value ($)
Common Stocks – 98.2%
Brokerage & Asset Managers – 0.7%
Brookfield Asset Management Ltd.	497,357	$17,185,908
Construction – 6.7%
American Homes 4 Rent, “A”, REIT	1,323,896	$47,713,212
AvalonBay Communities, Inc., REIT	299,909	55,129,272
Essex Property Trust, Inc., REIT	252,844	60,275,481
		$163,117,965
Engineering - Construction – 3.0%
Corporacion Inmobiliaria Vesta S.A.B. de C.V.	12,274,184	$45,510,332
Prologis Property Mexico S.A. de C.V., REIT	8,039,679	28,168,700
		$73,679,032
Forest & Paper Products – 4.2%
Rayonier, Inc., REIT	1,776,574	$53,119,563
Weyerhaeuser Co., REIT	1,496,346	49,005,331
		$102,124,894
Medical & Health Technology & Services – 3.6%
Encompass Health Corp.	612,413	$43,505,820
Universal Health Services, Inc.	327,886	44,166,244
		$87,672,064
Network & Telecom – 6.0%
Equinix, Inc., REIT	186,327	$145,592,191
Printing & Publishing – 0.8%
Lamar Advertising Co., REIT	204,818	$18,683,498
Real Estate – 68.6%
Alexandria Real Estate Equities, Inc., REIT	430,719	$50,109,848
Big Yellow Group PLC, REIT	3,173,616	43,218,598
Brixmor Property Group, Inc., REIT	2,024,017	44,487,894
Canadian Apartment Properties, REIT	841,324	30,179,821
CapitaLand India Trusts IEU, REIT	19,323,063	16,585,707
CapitaLand Investment Ltd.	24,079,200	57,728,076
CubeSmart, REIT	874,881	36,491,286
Douglas Emmett, Inc., REIT	869,352	11,884,042
Embassy Office Parks, REIT	3,277,774	12,082,662
Equity Lifestyle Properties, Inc., REIT	1,088,657	72,896,473
Extra Space Storage, Inc., REIT	527,904	67,930,687
Farmland Partners, Inc., REIT	979,715	10,874,836

11

Portfolio of Investments – continued

Issuer	Shares/Par	Value ($)
Common Stocks – continued
Real Estate – continued
Federal Realty Investment Trust, REIT	432,110	$42,320,853
Goodman Group, REIT	5,685,098	86,050,278
Grainger PLC	19,264,889	57,644,016
Granite REIT	906,627	50,511,309
Heiwa Real Estate Co. Ltd.	563,600	15,146,060
Japan Logistics Fund, Inc., REIT	14,718	30,853,225
Japan Metropolitan Fund Investment Corp., REIT	29,516	19,840,302
KATITAS Co. Ltd.	2,556,700	40,855,888
LEG Immobilien SE (a)	199,471	14,405,346
Mitsui Fudosan Co. Ltd.	2,137,000	46,883,426
National Storage, REIT	25,718,846	38,661,700
NNN REIT, Inc.	1,249,306	49,210,163
Nomura Real Estate Holdings	699,200	17,627,173
Parkway Real Estate LLC, REIT	6,072,400	17,254,072
Phillips Edison & Co., REIT	1,315,158	44,531,250
Prologis, Inc., REIT	1,883,210	233,894,682
Region RE Ltd., REIT	455,204	637,091
Rexford Industrial Realty, Inc., REIT	746,752	39,928,829
Rural Funds Group, REIT	4,105,210	5,745,537
SEGRO PLC, REIT	4,679,971	43,717,380
Shaftesbury Capital PLC, REIT	33,757,236	50,290,046
Shurgard Self Storage Ltd., REIT	867,774	39,850,131
Simon Property Group, Inc., REIT	205,953	23,373,606
Sino Land Co. Ltd.	19,801,635	22,699,408
Star Asia Investment Corp., REIT	42,237	16,808,291
Sun Communities, Inc., REIT	469,235	57,443,749
Swire Properties Ltd.	8,701,800	18,197,290
Unite Group PLC, REIT	2,852,501	33,985,404
Urban Edge Properties, REIT	1,078,850	17,649,986
Vonovia SE, REIT	1,433,710	34,373,184
		$1,664,859,605
Telecommunications - Wireless – 3.3%
Cellnex Telecom S.A.	1,008,113	$38,588,120
SBA Communications Corp., REIT	184,896	41,514,699
		$80,102,819
Telephone Services – 1.3%
Helios Towers PLC (a)	26,880,059	$31,038,071
Total Common Stocks (Identified Cost, $2,300,021,839)		$2,384,056,047

12

Portfolio of Investments – continued

Issuer	Shares/Par	Value ($)
Investment Companies (h) – 1.3%
Money Market Funds – 1.3%
MFS Institutional Money Market Portfolio, 5.3% (v) (Identified Cost, $32,590,020)	32,589,917	$32,593,176
Other Assets, Less Liabilities – 0.5%		10,964,186
Net Assets – 100.0%		$2,427,613,409

(a)	Non-income producing security.
(h)	An affiliated issuer, which may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. At period end, the aggregate values of the fund's investments in affiliated issuers and in unaffiliated issuers were $32,593,176 and $2,384,056,047, respectively.
(v)	Affiliated issuer that is available only to investment companies managed by MFS. The rate quoted for the MFS Institutional Money Market Portfolio is the annualized seven-day yield of the fund at period end.

The following abbreviations are used in this report and are defined:
IEU	International Equity Unit
REIT	Real Estate Investment Trust

See Notes to Financial Statements

13

Financial Statements

Statement of Assets and Liabilities

At 8/31/23

This statement represents your fund’s balance sheet, which details the assets and liabilities comprising the total value of the fund.

Assets
Investments in unaffiliated issuers, at value (identified cost, $2,300,021,839)	$2,384,056,047
Investments in affiliated issuers, at value (identified cost, $32,590,020)	32,593,176
Foreign currency, at value (identified cost, $407,965)	408,069
Receivables for
Investments sold	8,911,437
Fund shares sold	1,293,910
Dividends	4,820,143
Other assets	2,381
Total assets	$2,432,085,163
Liabilities
Payables for
Investments purchased	$1,623,964
Fund shares reacquired	2,075,106
Payable to affiliates
Investment adviser	106,597
Administrative services fee	1,966
Shareholder servicing costs	414,652
Distribution and service fees	1,653
Payable for independent Trustees' compensation	14
Accrued expenses and other liabilities	247,802
Total liabilities	$4,471,754
Net assets	$2,427,613,409
Net assets consist of
Paid-in capital	$2,484,196,840
Total distributable earnings (loss)	(56,583,431)
Net assets	$2,427,613,409
Shares of beneficial interest outstanding	152,882,297

14

Statement of Assets and Liabilities – continued

	Net assets	Shares outstanding	Net asset value per share (a)
Class A	$60,446,227	3,827,175	$15.79
Class B	672,331	42,558	15.80
Class C	10,848,882	688,481	15.76
Class I	1,056,119,848	66,618,136	15.85
Class R1	537,134	34,322	15.65
Class R2	2,813,755	177,510	15.85
Class R3	5,957,414	376,045	15.84
Class R4	1,134,249	71,448	15.88
Class R6	1,289,083,569	81,046,622	15.91

(a) Maximum offering price per share was equal to the net asset value per share for all share classes, except for Class A, for which the maximum offering price per share was $16.75 [100 / 94.25 x $15.79]. On sales of $50,000 or more, the maximum offering price of Class A shares is reduced. A contingent deferred sales charge may be imposed on redemptions of Class A, Class B, and Class C shares. Redemption price per share was equal to the net asset value per share for Classes I, R1, R2, R3, R4, and R6.

See Notes to Financial Statements

15

Financial Statements

Statement of Operations

Year ended 8/31/23

This statement describes how much your fund earned in investment income and accrued in expenses. It also describes any gains and/or losses generated by fund operations.

Net investment income (loss)
Income
Dividends	$72,710,648
Dividends from affiliated issuers	2,214,561
Other	141,096
Interest	331
Foreign taxes withheld	(2,438,011)
Total investment income	$72,628,625
Expenses
Management fee	$19,873,377
Distribution and service fees	327,175
Shareholder servicing costs	1,120,907
Administrative services fee	368,102
Independent Trustees' compensation	40,494
Custodian fee	248,187
Shareholder communications	80,306
Audit and tax fees	105,111
Legal fees	13,499
Miscellaneous	239,179
Total expenses	$22,416,337
Reduction of expenses by investment adviser and distributor	(318,233)
Net expenses	$22,098,104
Net investment income (loss)	$50,530,521
Realized and unrealized gain (loss)
Realized gain (loss) (identified cost basis)
Unaffiliated issuers	$(131,145,026)
Affiliated issuers	16,607
Foreign currency	(56,074)
Net realized gain (loss)	$(131,184,493)
Change in unrealized appreciation or depreciation
Unaffiliated issuers	$(34,201,814)
Affiliated issuers	(1,671)
Translation of assets and liabilities in foreign currencies	(1,645)
Net unrealized gain (loss)	$(34,205,130)
Net realized and unrealized gain (loss)	$(165,389,623)
Change in net assets from operations	$(114,859,102)

See Notes to Financial Statements

16

Financial Statements

Statements of Changes in Net Assets

These statements describe the increases and/or decreases in net assets resulting from operations, any distributions, and any shareholder transactions.

	Year ended
	8/31/23	8/31/22
Change in net assets
From operations
Net investment income (loss)	$50,530,521	$38,439,317
Net realized gain (loss)	(131,184,493)	169,282,748
Net unrealized gain (loss)	(34,205,130)	(756,952,956)
Change in net assets from operations	$(114,859,102)	$(549,230,891)
Total distributions to shareholders	$(138,502,792)	$(66,500,521)
Change in net assets from fund share transactions	$51,807,127	$609,206,028
Total change in net assets	$(201,554,767)	$(6,525,384)
Net assets
At beginning of period	2,629,168,176	2,635,693,560
At end of period	$2,427,613,409	$2,629,168,176

See Notes to Financial Statements

17

Financial Statements

Financial Highlights

The financial highlights table is intended to help you understand the fund's financial performance for the past 5 years. Certain information reflects financial results for a single fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the fund share class (assuming reinvestment of all distributions) held for the entire period.

Class A	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.49	$21.62	$16.38	$17.68	$16.19
Income (loss) from investment operations
Net investment income (loss) (d)	$0.28	$0.21	$0.23	$0.31	$0.34
Net realized and unrealized gain (loss)	(1.10)	(3.92)	5.15	(0.64)	1.56
Total from investment operations	$(0.82)	$(3.71)	$5.38	$(0.33)	$1.90
Less distributions declared to shareholders
From net investment income	$(0.04)	$(0.30)	$(0.14)	$(0.97)	$(0.33)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.88)	$(0.42)	$(0.14)	$(0.97)	$(0.41)
Net asset value, end of period (x)	$15.79	$17.49	$21.62	$16.38	$17.68
Total return (%) (r)(s)(t)(x)	(4.81)	(17.53)	33.02	(2.04)	12.24
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.20	1.18	1.19	1.22	1.26
Expenses after expense reductions	1.19	1.17	1.18	1.21	1.25
Net investment income (loss)	1.78	1.05	1.21	1.89	2.06
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$60,446	$77,694	$112,559	$75,185	$79,083

See Notes to Financial Statements

18

Financial Highlights – continued

Class B (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.57	$21.74	$16.47	$17.78	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.17	$0.06	$0.09	$0.19	$0.22
Net realized and unrealized gain (loss)	(1.10)	(3.96)	5.18	(0.65)	1.59
Total from investment operations	$(0.93)	$(3.90)	$5.27	$(0.46)	$1.81
Less distributions declared to shareholders
From net investment income	$—	$(0.15)	$(0.00)(w)	$(0.85)	$(0.21)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.84)	$(0.27)	$(0.00)(w)	$(0.85)	$(0.29)
Net asset value, end of period (x)	$15.80	$17.57	$21.74	$16.47	$17.78
Total return (%) (r)(s)(t)(x)	(5.44)	(18.19)	32.02	(2.79)	11.46
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.95	1.93	1.94	1.97	2.01
Expenses after expense reductions	1.94	1.92	1.93	1.96	2.00
Net investment income (loss)	1.04	0.32	0.48	1.15	1.33
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$672	$1,126	$1,396	$1,173	$1,247

Class C (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.53	$21.70	$16.45	$17.76	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.17	$0.06	$0.09	$0.19	$0.22
Net realized and unrealized gain (loss)	(1.10)	(3.96)	5.18	(0.66)	1.58
Total from investment operations	$(0.93)	$(3.90)	$5.27	$(0.47)	$1.80
Less distributions declared to shareholders
From net investment income	$—	$(0.15)	$(0.02)	$(0.84)	$(0.22)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.84)	$(0.27)	$(0.02)	$(0.84)	$(0.30)
Net asset value, end of period (x)	$15.76	$17.53	$21.70	$16.45	$17.76
Total return (%) (r)(s)(t)(x)	(5.45)	(18.19)	32.09	(2.81)	11.44
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.95	1.93	1.94	1.97	2.01
Expenses after expense reductions	1.94	1.92	1.93	1.95	2.00
Net investment income (loss)	1.03	0.32	0.47	1.15	1.33
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$10,849	$13,171	$16,414	$11,213	$10,165

See Notes to Financial Statements

19

Financial Highlights – continued

Class I	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.56	$21.71	$16.45	$17.75	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.32	$0.27	$0.27	$0.35	$0.39
Net realized and unrealized gain (loss)	(1.10)	(3.94)	5.17	(0.64)	1.56
Total from investment operations	$(0.78)	$(3.67)	$5.44	$(0.29)	$1.95
Less distributions declared to shareholders
From net investment income	$(0.09)	$(0.36)	$(0.18)	$(1.01)	$(0.38)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.93)	$(0.48)	$(0.18)	$(1.01)	$(0.46)
Net asset value, end of period (x)	$15.85	$17.56	$21.71	$16.45	$17.75
Total return (%) (r)(s)(t)(x)	(4.57)	(17.32)	33.31	(1.80)	12.52
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	0.95	0.93	0.94	0.97	1.01
Expenses after expense reductions	0.94	0.92	0.93	0.96	1.00
Net investment income (loss)	2.03	1.32	1.47	2.14	2.40
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$1,056,120	$1,143,428	$1,070,398	$703,606	$663,977

See Notes to Financial Statements

20

Financial Highlights – continued

Class R1 (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.42	$21.51	$16.32	$17.65	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.16	$0.06	$0.09	$0.19	$0.23
Net realized and unrealized gain (loss)	(1.09)	(3.92)	5.13	(0.65)	1.55
Total from investment operations	$(0.93)	$(3.86)	$5.22	$(0.46)	$1.78
Less distributions declared to shareholders
From net investment income	$—	$(0.11)	$(0.03)	$(0.87)	$(0.31)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.84)	$(0.23)	$(0.03)	$(0.87)	$(0.39)
Net asset value, end of period (x)	$15.65	$17.42	$21.51	$16.32	$17.65
Total return (%) (r)(s)(t)(x)	(5.49)	(18.15)	32.03	(2.80)	11.45
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.95	1.94	1.95	1.97	2.01
Expenses after expense reductions	1.94	1.92	1.93	1.96	2.00
Net investment income (loss)	1.03	0.31	0.48	1.14	1.39
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$537	$501	$485	$411	$333

Class R2 (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.55	$21.71	$16.45	$17.76	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.24	$0.17	$0.18	$0.27	$0.30
Net realized and unrealized gain (loss)	(1.10)	(3.96)	5.18	(0.65)	1.58
Total from investment operations	$(0.86)	$(3.79)	$5.36	$(0.38)	$1.88
Less distributions declared to shareholders
From net investment income	$(0.00)(w)	$(0.25)	$(0.10)	$(0.93)	$(0.30)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.84)	$(0.37)	$(0.10)	$(0.93)	$(0.38)
Net asset value, end of period (x)	$15.85	$17.55	$21.71	$16.45	$17.76
Total return (%) (r)(s)(t)(x)	(5.03)	(17.76)	32.71	(2.32)	12.00
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.45	1.43	1.44	1.47	1.51
Expenses after expense reductions	1.44	1.42	1.43	1.46	1.50
Net investment income (loss)	1.53	0.82	0.97	1.67	1.82
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$2,814	$2,818	$3,504	$2,270	$2,190

See Notes to Financial Statements

21

Financial Highlights – continued

Class R3 (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.55	$21.70	$16.44	$17.76	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.28	$0.21	$0.23	$0.31	$0.34
Net realized and unrealized gain (loss)	(1.10)	(3.94)	5.17	(0.65)	1.57
Total from investment operations	$(0.82)	$(3.73)	$5.40	$(0.34)	$1.91
Less distributions declared to shareholders
From net investment income	$(0.05)	$(0.30)	$(0.14)	$(0.98)	$(0.33)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.89)	$(0.42)	$(0.14)	$(0.98)	$(0.41)
Net asset value, end of period (x)	$15.84	$17.55	$21.70	$16.44	$17.76
Total return (%) (r)(s)(t)(x)	(4.80)	(17.53)	33.04	(2.09)	12.22
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	1.20	1.18	1.20	1.22	1.26
Expenses after expense reductions	1.19	1.17	1.18	1.21	1.25
Net investment income (loss)	1.77	1.05	1.22	1.90	2.05
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$5,957	$6,865	$6,082	$4,255	$3,768

Class R4 (y)	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.56	$21.72	$16.45	$17.75	$16.26
Income (loss) from investment operations
Net investment income (loss) (d)	$0.33	$0.28	$0.27	$0.35	$0.38
Net realized and unrealized gain (loss)	(1.10)	(3.97)	5.18	(0.64)	1.56
Total from investment operations	$(0.77)	$(3.69)	$5.45	$(0.29)	$1.94
Less distributions declared to shareholders
From net investment income	$(0.07)	$(0.35)	$(0.18)	$(1.01)	$(0.37)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.91)	$(0.47)	$(0.18)	$(1.01)	$(0.45)
Net asset value, end of period (x)	$15.88	$17.56	$21.72	$16.45	$17.75
Total return (%) (r)(s)(t)(x)	(4.47)	(17.36)	33.37	(1.79)	12.46
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	0.95	0.92	0.95	0.97	1.01
Expenses after expense reductions	0.94	0.91	0.93	0.96	1.00
Net investment income (loss)	2.04	1.32	1.47	2.13	2.30
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$1,134	$1,242	$5,680	$3,649	$3,893

See Notes to Financial Statements

22

Financial Highlights – continued

Class R6	Year ended
	8/31/23	8/31/22	8/31/21	8/31/20	8/31/19
Net asset value, beginning of period	$17.61	$21.78	$16.49	$17.80	$16.29
Income (loss) from investment operations
Net investment income (loss) (d)	$0.34	$0.28	$0.29	$0.37	$0.40
Net realized and unrealized gain (loss)	(1.09)	(3.96)	5.19	(0.65)	1.58
Total from investment operations	$(0.75)	$(3.68)	$5.48	$(0.28)	$1.98
Less distributions declared to shareholders
From net investment income	$(0.11)	$(0.37)	$(0.19)	$(1.03)	$(0.39)
From net realized gain	(0.84)	(0.12)	—	—	(0.08)
Total distributions declared to shareholders	$(0.95)	$(0.49)	$(0.19)	$(1.03)	$(0.47)
Net asset value, end of period (x)	$15.91	$17.61	$21.78	$16.49	$17.80
Total return (%) (r)(s)(t)(x)	(4.39)	(17.31)	33.49	(1.76)	12.68
Ratios (%) (to average net assets) and Supplemental data:
Expenses before expense reductions	0.86	0.84	0.87	0.89	0.93
Expenses after expense reductions	0.85	0.82	0.85	0.88	0.92
Net investment income (loss)	2.12	1.41	1.55	2.23	2.40
Portfolio turnover	30	29	22	39	55
Net assets at end of period (000 omitted)	$1,289,084	$1,382,324	$1,419,175	$1,068,677	$918,174

(d)	Per share data is based on average shares outstanding.
(r)	Certain expenses have been reduced without which performance would have been lower.
(s)	From time to time the fund may receive proceeds from litigation settlements, without which performance would be lower.
(t)	Total returns do not include any applicable sales charges.
(w)	Per share amount was less than $0.01.
(x)	The net asset values and total returns have been calculated on net assets which include adjustments made in accordance with U.S. generally accepted accounting principles required at period end for financial reporting purposes.
(y)	Per share amounts have been restated on a retroactive basis to reflect a reverse stock split completed at the ratios noted below after the close of business on November 2, 2018. Class B 1 : 0.5437 Class C 1 : 0.5399 Class R1 1 : 0.5487 Class R2 1 : 0.5473 Class R3 1 : 0.5493 Class R4 1 : 0.5504

See Notes to Financial Statements

23

Notes to Financial Statements

(1) Business and Organization

MFS Global Real Estate Fund (the fund) is a diversified series of MFS Series Trust XIII (the trust). The trust is organized as a Massachusetts business trust and is registered under the Investment Company Act of 1940, as amended, as an open-end management investment company.

The fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services - Investment Companies.

(2) Significant Accounting Policies

General — The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates. In the preparation of these financial statements, management has evaluated subsequent events occurring after the date of the fund’s Statement of Assets and Liabilities through the date that the financial statements were issued. The fund invests a significant amount of its net assets in U.S. and foreign real estate related investments and as a result is subject to 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 manager; and other factors. The fund invests in foreign securities. Investments in foreign securities are vulnerable to the effects of changes in the relative values of the local currency and the U.S. dollar and to the effects of changes in each country’s market, economic, industrial, political, regulatory, geopolitical, environmental, public health, and other conditions.

Balance Sheet Offsetting — The fund's accounting policy with respect to balance sheet offsetting is that, absent an event of default by the counterparty or a termination of the agreement, the International Swaps and Derivatives Association (ISDA) Master Agreement, or similar agreement, does not result in an offset of reported amounts of financial assets and financial liabilities in the Statement of Assets and Liabilities across transactions between the fund and the applicable counterparty. The fund's right to setoff may be restricted or prohibited by the bankruptcy or insolvency laws of the particular jurisdiction to which a specific master netting agreement counterparty is subject. Balance sheet offsetting disclosures, to the extent applicable to the fund, have been included in the fund’s Significant Accounting Policies note under the captions for each of the fund’s in-scope financial instruments and transactions.

Investment Valuations — Subject to its oversight, the fund's Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund’s investments to MFS as the fund's adviser, pursuant to the fund’s valuation policy and procedures which have been adopted by the adviser and approved by the

24

Notes to Financial Statements  - continued

Board. In accordance with Rule 2a-5 under the Investment Company Act of 1940, the Board of Trustees designated the adviser as the “valuation designee” of the fund. If the adviser, as valuation designee, determines that reliable market quotations are not readily available for an investment, the investment is valued at fair value as determined in good faith by the adviser in accordance with the adviser’s fair valuation policy and procedures.

Under the fund's valuation policy and procedures, equity securities, including restricted equity securities, are generally valued at the last sale or official closing price on their primary market or exchange as provided by a third-party pricing service. Equity securities, for which there were no sales reported that day, are generally valued at the last quoted daily bid quotation on their primary market or exchange as provided by a third-party pricing service. Short-term instruments with a maturity at issuance of 60 days or less may be valued at amortized cost, which approximates market value.

Open-end investment companies are generally valued at net asset value per share. The values of foreign securities and other assets and liabilities expressed in foreign currencies are converted to U.S. dollars using the mean of bid and asked prices for rates provided by a third-party pricing service.

Under the fund’s valuation policy and procedures, market quotations are not considered to be readily available for debt instruments, floating rate loans, and many types of derivatives. These investments are generally valued at fair value based on information from third-party pricing services or otherwise determined by the adviser in accordance with the adviser’s fair valuation policy and procedures. Securities and other assets generally valued on the basis of information from a third-party pricing service may also be valued at a broker/dealer bid quotation. In determining values, third-party pricing services can utilize both transaction data and market information such as yield, quality, coupon rate, maturity, type of issue, trading characteristics, spreads and other market data. An investment may also be valued at fair value if the adviser determines that the investment’s value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund’s net asset value, or after the halt of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. Events that occur after foreign markets close (such as developments in foreign markets and significant movements in the U.S. markets) and prior to the determination of the fund’s net asset value may be deemed to have a material effect on the value of securities traded in foreign markets. Accordingly, the fund’s foreign equity securities may often be valued at fair value. The adviser generally relies on third-party pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund’s net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of an investment used to determine the fund’s net asset value may differ from quoted or published prices for the same investment. There can be no assurance that the fund could obtain the fair value assigned to an investment if it were to sell the investment at the same time at which the fund determines its net asset value per share.

25

Notes to Financial Statements  - continued

Various inputs are used in determining the value of the fund's assets or liabilities. These inputs are categorized into three broad levels. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The fund's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the investment. Level 1 includes unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 includes other significant observable market-based inputs (including quoted prices for similar securities, interest rates, prepayment speed, and credit risk). Level 3 includes significant unobservable inputs, which may include the adviser's own assumptions in determining the fair value of investments. The following is a summary of the levels used as of August 31, 2023 in valuing the fund's assets and liabilities:

Financial Instruments	Level 1	Level 2	Level 3	Total
Equity Securities	$2,384,056,047	$—	$—	$2,384,056,047
Mutual Funds	32,593,176	—	—	32,593,176
Total	$2,416,649,223	$—	$—	$2,416,649,223

For further information regarding security characteristics, see the Portfolio of Investments.

Foreign Currency Translation — Purchases and sales of foreign investments, income, and expenses are converted into U.S. dollars based upon currency exchange rates prevailing on the respective dates of such transactions or on the reporting date for foreign denominated receivables and payables. Gains and losses attributable to foreign currency exchange rates on sales of securities are recorded for financial statement purposes as net realized gains and losses on investments. Gains and losses attributable to foreign exchange rate movements on receivables, payables, income and expenses are recorded for financial statement purposes as foreign currency transaction gains and losses. That portion of both realized and unrealized gains and losses on investments that results from fluctuations in foreign currency exchange rates is not separately disclosed.

Indemnifications — Under the fund's organizational documents, its officers and Trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the fund. Additionally, in the normal course of business, the fund enters into agreements with service providers that may contain indemnification clauses. The fund's maximum exposure under these agreements is unknown as this would involve future claims that may be made against the fund that have not yet occurred.

Investment Transactions and Income —  Interest income is recorded on the accrual basis. Dividends received in cash are recorded on the ex-dividend date. Certain dividends from foreign securities will be recorded when the fund is informed of the dividend if such information is obtained subsequent to the ex-dividend date. Dividend and interest payments received in additional securities are recorded on the ex-dividend or ex-interest date in an amount equal to the value of the security on such date.

Distributions from REITs may be characterized as ordinary income, net capital gain, or a return of capital to the fund. The proper characterization of REIT distributions is

26

Notes to Financial Statements  - continued

generally not known until after the end of each calendar year. As such, estimates are used in reporting the character of income and distributions for financial statement purposes. The fund receives substantial distributions from holdings in REITs.

The fund may receive proceeds from litigation settlements. Any proceeds received from litigation involving portfolio holdings are reflected in the Statement of Operations in realized gain/loss if the security has been disposed of by the fund or in unrealized gain/loss if the security is still held by the fund. Any other proceeds from litigation not related to portfolio holdings are reflected as other income in the Statement of Operations.

Investment transactions are recorded on the trade date.  In determining the net gain or loss on securities sold, the cost of securities is determined on the identified cost basis.

Tax Matters and Distributions — The fund intends to qualify as a regulated investment company, as defined under Subchapter M of the Internal Revenue Code, and to distribute all of its taxable income, including realized capital gains. As a result, no provision for federal income tax is required. The fund’s federal tax returns, when filed, will remain subject to examination by the Internal Revenue Service for a three year period. Management has analyzed the fund’s tax positions taken on federal and state tax returns for all open tax years and does not believe that there are any uncertain tax positions that require recognition of a tax liability. Foreign taxes, if any, have been accrued by the fund in the accompanying financial statements in accordance with the applicable foreign tax law. Foreign income taxes may be withheld by certain countries in which the fund invests. Additionally, capital gains realized by the fund on securities issued in or by certain foreign countries may be subject to capital gains tax imposed by those countries.

Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from U.S. generally accepted accounting principles. Certain capital accounts in the financial statements are periodically adjusted for permanent differences in order to reflect their tax character. These adjustments have no impact on net assets or net asset value per share. Temporary differences which arise from recognizing certain items of income, expense, gain or loss in different periods for financial statement and tax purposes will reverse at some time in the future.

Book/tax differences primarily relate to passive foreign investment companies and wash sale loss deferrals.

The tax character of distributions declared to shareholders for the last two fiscal years is as follows:

	Year ended 8/31/23	Year ended 8/31/22
Ordinary income (including any short-term capital gains)	$14,500,887	$50,000,023
Long-term capital gains	124,001,905	16,500,498
Total distributions	$138,502,792	$66,500,521

27

Notes to Financial Statements  - continued

The federal tax cost and the tax basis components of distributable earnings were as follows:

As of 8/31/23
Cost of investments	$2,364,680,828
Gross appreciation	295,612,778
Gross depreciation	(243,644,383)
Net unrealized appreciation (depreciation)	$51,968,395
Undistributed ordinary income	32,342,832
Post-October capital loss deferral	(140,830,777)
Other temporary differences	(63,881)
Total distributable earnings (loss)	$(56,583,431)

Multiple Classes of Shares of Beneficial Interest — The fund offers multiple classes of shares, which differ in their respective distribution and service fees. The fund's income, realized and unrealized gain (loss), and common expenses are allocated to shareholders based on the daily net assets of each class. Dividends are declared separately for each class. Differences in per share dividend rates are generally due to differences in separate class expenses. Class B and Class C shares will convert to Class A shares approximately eight years after purchase. The fund’s distributions declared to shareholders as reported in the Statements of Changes in Net Assets are presented by class as follows:

	Year ended 8/31/23	Year ended 8/31/22
Class A	$3,610,022	$1,768,149
Class B	50,081	17,117
Class C	614,058	205,778
Class I	57,962,597	30,224,650
Class R1	23,952	4,427
Class R2	139,097	58,854
Class R3	345,654	126,788
Class R4	65,342	128,149
Class R6	75,691,989	33,966,609
Total	$138,502,792	$66,500,521

(3) Transactions with Affiliates

Investment Adviser — The fund has an investment advisory agreement with MFS to provide overall investment management and related administrative services and facilities to the fund. The management fee is computed daily and paid monthly at the following annual rates based on the fund's average daily net assets:

Up to $1 billion	0.90%
In excess of $1 billion and up to $2.5 billion	0.75%
In excess of $2.5 billion	0.65%

MFS has agreed in writing to reduce its management fee by a specified amount if certain MFS mutual fund assets exceed thresholds agreed to by MFS and the fund's Board of Trustees. MFS has also agreed in writing to waive at least 0.01% of its

28

Notes to Financial Statements  - continued

management fee as part of this agreement. The agreement to waive at least 0.01% of the management fee will continue until modified by the fund's Board of Trustees, but such agreement will continue at least until December 31, 2023. For the year ended August 31, 2023, this management fee reduction amounted to $318,232, which is included in the reduction of total expenses in the Statement of Operations. The management fee incurred for the year ended August 31, 2023 was equivalent to an annual effective rate of 0.80% of the fund's average daily net assets.

The investment adviser has agreed in writing to pay a portion of the fund’s total annual operating 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 that total fund operating expenses do not exceed the following rates annually of each class’s average daily net assets:

				Classes
A	B	C	I	R1	R2	R3	R4	R6
1.35%	2.10%	2.10%	1.10%	2.10%	1.60%	1.35%	1.10%	1.04%

This written agreement will continue until modified by the fund’s Board of Trustees, but such agreement will continue at least until December 31, 2024. For the year ended August 31, 2023, the fund’s actual operating expenses did not exceed the limit and therefore, the investment adviser did not pay any portion of the fund’s expenses related to this agreement.

Distributor — MFS Fund Distributors, Inc. (MFD), a wholly-owned subsidiary of MFS, as distributor, received $10,711 for the year ended August 31, 2023, as its portion of the initial sales charge on sales of Class A shares of the fund.

The Board of Trustees has adopted a distribution plan for certain share classes pursuant to Rule 12b-1 of the Investment Company Act of 1940.

The fund's distribution plan provides that the fund will pay MFD for services provided by MFD and financial intermediaries in connection with the distribution and servicing of certain share classes.  One component of the plan is a distribution fee paid to MFD and another component of the plan is a service fee paid to MFD. MFD may subsequently pay all, or a portion, of the distribution and/or service fees to financial intermediaries. The distribution and service fees are computed daily and paid monthly.

29

Notes to Financial Statements  - continued

Distribution Plan Fee Table:

	Distribution Fee Rate (d)	Service Fee Rate (d)	Total Distribution Plan (d)	Annual Effective Rate (e)	Distribution and Service Fee
Class A	—	0.25%	0.25%	0.25%	$ 165,261
Class B	0.75%	0.25%	1.00%	1.00%	8,825
Class C	0.75%	0.25%	1.00%	1.00%	118,547
Class R1	0.75%	0.25%	1.00%	1.00%	4,998
Class R2	0.25%	0.25%	0.50%	0.50%	13,934
Class R3	—	0.25%	0.25%	0.25%	15,610
Total Distribution and Service Fees					$327,175

(d) In accordance with the distribution plan for certain classes, the fund pays distribution and/or service fees equal to these annual percentage rates of each class’s average daily net assets. The distribution and service fee rates disclosed by class represent the current rates in effect at the end of the reporting period. Any rate changes, if applicable, are detailed below.

(e) The annual effective rates represent actual fees incurred under the distribution plan for the year ended August 31, 2023 based on each class's average daily net assets. MFD has voluntarily agreed to rebate a portion of each class's 0.25% service fee attributable to accounts for which there is no financial intermediary specified on the account except for accounts attributable to MFS or its affiliates' seed money. For the year ended August 31, 2023, this rebate amounted to $1 for Class A shares and is included in the reduction of total expenses in the Statement of Operations.

Certain Class A shares are subject to a contingent deferred sales charge (CDSC) in the event of a shareholder redemption within 18 months of purchase. Class B shares are subject to a CDSC in the event of a shareholder redemption within six years of purchase. Class C shares are subject to a CDSC in the event of a shareholder redemption within 12 months of purchase.  All contingent deferred sales charges are paid to MFD and during the year ended August 31, 2023, were as follows:

	Amount
Class A	$7,237
Class B	224
Class C	473

Shareholder Servicing Agent — MFS Service Center, Inc. (MFSC), a wholly-owned subsidiary of MFS, receives a fee from the fund for its services as shareholder servicing agent calculated as a percentage of the average daily net assets of the fund as determined periodically under the supervision of the fund's Board of Trustees. For the year ended August 31, 2023, the fee was $35,221, which equated to 0.0014% annually of the fund's average daily net assets. MFSC also receives reimbursement from the fund for out-of-pocket expenses, sub-accounting and other shareholder servicing costs which may be paid to affiliated and unaffiliated service providers. Class R6 shares do not incur sub-accounting fees. For the year ended August 31, 2023, these out-of-pocket expenses, sub-accounting and other shareholder servicing costs amounted to $1,085,686.

Administrator — MFS provides certain financial, legal, shareholder communications, compliance, and other administrative services to the fund.  Under an administrative services agreement, the fund reimburses MFS the costs incurred to provide these

30

Notes to Financial Statements  - continued

services.  The fund is charged an annual fixed amount of $17,500 plus a fee based on average daily net assets. The administrative services fee is computed daily and paid monthly. The administrative services fee incurred for the year ended August 31, 2023 was equivalent to an annual effective rate of 0.0150% of the fund's average daily net assets.

Trustees’ and Officers’ Compensation — The fund pays compensation to independent Trustees in the form of a retainer, attendance fees, and additional compensation to Board and Committee chairpersons. Independent Trustees’ compensation is accrued daily and paid subsequent to each Trustee Board meeting. The fund does not pay compensation directly to Trustees or officers of the fund who are also officers of the investment adviser, all of whom receive remuneration from MFS for their services to the fund. Certain officers and Trustees of the fund are officers or directors of MFS, MFD, and MFSC.

Other — The fund invests in the MFS Institutional Money Market Portfolio which is managed by MFS and seeks current income consistent with preservation of capital and liquidity. This money market fund does not pay a management fee to MFS but does incur investment and operating costs.

The adviser has voluntarily undertaken to reimburse the fund from its own resources on a quarterly basis for the cost of investment research embedded in the cost of the fund’s securities trades. This agreement may be rescinded at any time. For the year ended August 31, 2023, this reimbursement amounted to $140,368, which is included in “Other” income in the Statement of Operations.

(4) Portfolio Securities

For the year ended August 31, 2023, purchases and sales of investments, other than short-term obligations, aggregated $710,873,944 and $726,590,977, respectively.

(5) Shares of Beneficial Interest

The fund's Declaration of Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest. Transactions in fund shares were as follows:

	Year ended 8/31/23		Year ended 8/31/22
	Shares	Amount	Shares	Amount
Shares sold
Class A	564,723	$8,974,409	1,658,755	$34,094,678
Class B	630	9,981	7,671	162,435
Class C	78,098	1,244,482	89,992	1,799,139
Class I	17,943,726	283,923,826	31,890,513	669,812,347
Class R1	5,385	85,073	10,509	199,518
Class R2	54,018	849,655	43,779	895,501
Class R3	107,257	1,700,467	207,687	4,000,372
Class R4	18,003	290,567	131,468	2,814,096
Class R6	15,509,890	246,353,977	21,283,551	439,851,620
	34,281,730	$543,432,437	55,323,925	$1,153,629,706

31

Notes to Financial Statements  - continued

	Year ended 8/31/23		Year ended 8/31/22
	Shares	Amount	Shares	Amount
Shares issued to shareholders in reinvestment of distributions
Class A	223,581	$3,601,891	82,635	$1,762,602
Class B	3,091	50,081	794	17,117
Class C	37,991	613,933	9,472	203,643
Class I	3,451,144	55,701,471	1,370,461	29,300,452
Class R1	1,492	23,952	207	4,427
Class R2	8,591	139,097	2,730	58,561
Class R3	21,389	345,654	5,922	126,788
Class R4	4,043	65,342	5,991	128,149
Class R6	3,711,958	60,059,484	1,125,035	24,120,743
	7,463,280	$120,600,905	2,603,247	$55,722,482
Shares reacquired
Class A	(1,404,542)	$(22,358,816)	(2,503,953)	$(52,071,608)
Class B	(25,237)	(404,219)	(8,618)	(172,907)
Class C	(178,870)	(2,838,215)	(104,695)	(2,067,180)
Class I	(19,908,075)	(317,365,437)	(17,425,159)	(353,779,924)
Class R1	(1,311)	(21,031)	(4,498)	(95,027)
Class R2	(45,671)	(720,744)	(47,365)	(961,400)
Class R3	(143,846)	(2,314,127)	(102,585)	(2,027,801)
Class R4	(21,323)	(336,930)	(328,278)	(6,870,408)
Class R6	(16,651,299)	(265,866,696)	(9,100,375)	(182,099,905)
	(38,380,174)	$(612,226,215)	(29,625,526)	$(600,146,160)
Net change
Class A	(616,238)	$(9,782,516)	(762,563)	$(16,214,328)
Class B	(21,516)	(344,157)	(153)	6,645
Class C	(62,781)	(979,800)	(5,231)	(64,398)
Class I	1,486,795	22,259,860	15,835,815	345,332,875
Class R1	5,566	87,994	6,218	108,918
Class R2	16,938	268,008	(856)	(7,338)
Class R3	(15,200)	(268,006)	111,024	2,099,359
Class R4	723	18,979	(190,819)	(3,928,163)
Class R6	2,570,549	40,546,765	13,308,211	281,872,458
	3,364,836	$51,807,127	28,301,646	$609,206,028

The fund is one of several mutual funds in which certain MFS funds may invest. The MFS funds do not invest in the underlying funds for the purpose of exercising management or control. At the end of the period, the MFS Growth Allocation Fund, the MFS Moderate Allocation Fund, the MFS Aggressive Growth Allocation Fund, the MFS Conservative Allocation Fund, and MFS Lifetime 2040 Fund, were the owners of

32

Notes to Financial Statements  - continued

record of approximately 10%, 8%, 5%, 3%, and 1%, respectively, of the value of outstanding voting shares of the fund. In addition, the MFS Lifetime Income Fund, the MFS Lifetime 2065 Fund, the MFS Lifetime 2060 Fund, the MFS Lifetime 2055 Fund, the MFS Lifetime 2050 Fund, the MFS Lifetime 2045 Fund, the MFS Lifetime 2035 Fund, the MFS Lifetime 2030 Fund, and the MFS Lifetime 2025 Fund were each the owners of record of less than 1% of the value of outstanding voting shares of the
fund.

Effective June 1, 2019, purchases of the fund’s Class B shares were closed to new and existing investors subject to certain exceptions. On March 30, 2023, the fund announced that effective after the close of business on September 29, 2023, purchases of Class R1 and Class R2 shares will be closed to new eligible investors.

(6) Line of Credit

The fund and certain other funds managed by MFS participate in a $1.45 billion unsecured committed line of credit of which $1.2 billion is reserved for use by the fund and certain other MFS U.S. funds. The line of credit is provided by a syndicate of banks under a credit agreement. Borrowings may be made for temporary financing needs. Interest is charged to each fund, based on its borrowings, generally at a rate equal to the highest of 1) Daily Simple SOFR (Secured Overnight Financing Rate) plus 0.10%, 2) the Federal Funds Effective Rate, or 3) the Overnight Bank Funding Rate, each plus an agreed upon spread. A commitment fee, based on the average daily unused portion of the committed line of credit, is allocated among the participating funds. The line of credit expires on March 14, 2024 unless extended or renewed. In addition, the fund and other funds managed by MFS have established unsecured uncommitted borrowing arrangements with certain banks for temporary financing needs. Interest is charged to each fund, based on its borrowings, at rates equal to customary reference rates plus an agreed upon spread. For the year ended August 31, 2023, the fund’s commitment fee and interest expense were $13,254 and $0, respectively, and are included in “Miscellaneous” expense in the Statement of Operations.

(7) Investments in Affiliated Issuers

An affiliated issuer may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. For the purposes of this report, the following were affiliated issuers:

Affiliated Issuers	Beginning Value	Purchases	Sales Proceeds	Realized Gain (Loss)	Change in Unrealized Appreciation or Depreciation	Ending Value
MFS Institutional Money Market Portfolio	$51,572,424	$448,395,295	$467,389,479	$16,607	$(1,671)	$32,593,176

Affiliated Issuers	Dividend Income	Capital Gain Distributions
MFS Institutional Money Market Portfolio	$2,214,561	$—

33

Report of Independent Registered Public Accounting Firm

To the Shareholders of MFS Global Real Estate Fund and the Board of Trustees of MFS Series Trust XIII

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of MFS Global Real Estate Fund (the “Fund”) (one of the funds constituting MFS Series Trust XIII (the “Trust”)), including the portfolio of investments, as of August 31, 2023, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting MFS Series Trust XIII) at August 31, 2023, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and its financial highlights for each of the five years in the period then ended, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Trust’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Trust in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Trust is not required to have, nor were we engaged to perform, an audit of the Trust’s internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion.

34

Report of Independent Registered Public Accounting Firm – continued

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of August 31, 2023, by correspondence with the custodian, brokers and others; when replies were not received from brokers and others, we performed other auditing procedures. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

We have served as the auditor of one or more MFS investment companies since 1993.

Boston, Massachusetts
October 16, 2023

35

Trustees and Officers — Identification and Background

The Trustees and Officers of the Trust, as of October 1, 2023, are listed below, together with their principal occupations during the past five years. (Their titles may have varied during that period.)  The address of each Trustee and Officer is 111 Huntington Avenue, Boston, Massachusetts 02199-7618.

Name, Age	Position(s) Held with Fund	Trustee/Officer Since(h)	Number of MFS Funds overseen by the Trustee	Principal Occupations During the Past Five Years	Other Directorships During the Past Five Years (j)
INTERESTED TRUSTEE
Michael W. Roberge (k) (age 57)	Trustee	January 2021	136	Massachusetts Financial Services Company, Chairman (since January 2021); Chief Executive Officer (since January 2017); Director; Chairman of the Board (since January 2022); President (until December 2018); Chief Investment Officer (until December 2018)	N/A
INDEPENDENT TRUSTEES
John P. Kavanaugh (age 68)	Trustee and Chair of Trustees	January 2009	136	Private investor	N/A
Steven E. Buller (age 72)	Trustee	February 2014	136	Private investor	N/A
John A. Caroselli (age 69)	Trustee	March 2017	136	Private investor; JC Global Advisors, LLC (management consulting), President (since 2015)	N/A
Maureen R. Goldfarb (age 68)	Trustee	January 2009	136	Private investor	N/A
Peter D. Jones (age 68)	Trustee	January 2019	136	Private investor	N/A
James W. Kilman, Jr. (age 62)	Trustee	January 2019	136	Burford Capital Limited (finance and investment management), Senior Advisor (since May 3, 2021), Chief Financial Officer (2019 - May 2, 2021); KielStrand Capital LLC (family office), Chief Executive Officer (since 2016)	Alpha-En Corporation, Director (2016-2019)

36

Trustees and Officers - continued

Name, Age	Position(s) Held with Fund	Trustee/Officer Since(h)	Number of MFS Funds overseen by the Trustee	Principal Occupations During the Past Five Years	Other Directorships During the Past Five Years (j)
Clarence Otis, Jr. (age 67)	Trustee	March 2017	136	Private investor	VF Corporation, Director; Verizon Communications, Inc., Director; The Travelers Companies, Director
Maryanne L. Roepke (age 67)	Trustee	May 2014	136	Private investor	N/A
Laurie J. Thomsen (age 66)	Trustee	March 2005	136	Private investor	The Travelers Companies, Director; Dycom Industries, Inc., Director

Name, Age	Position(s) Held with Fund	Trustee/Officer Since(h)	Number of MFS Funds for which the Person is an Officer	Principal Occupations During the Past Five Years
OFFICERS
Christopher R. Bohane (k) (age 49)	Assistant Secretary and Assistant Clerk	July 2005	136	Massachusetts Financial Services Company, Senior Vice President and Senior Managing Counsel
Kino Clark (k) (age 55)	Assistant Treasurer	January 2012	136	Massachusetts Financial Services Company, Vice President
John W. Clark, Jr. (k) (age 56)	Assistant Treasurer	April 2017	136	Massachusetts Financial Services Company, Vice President
David L. DiLorenzo (k) (age 55)	President	July 2005	136	Massachusetts Financial Services Company, Senior Vice President
Heidi W. Hardin (k) (age 56)	Secretary and Clerk	April 2017	136	Massachusetts Financial Services Company, Executive Vice President and General Counsel
Brian E. Langenfeld (k) (age 50)	Assistant Secretary and Assistant Clerk	June 2006	136	Massachusetts Financial Services Company, Vice President and Managing Counsel

37

Trustees and Officers - continued

Name, Age	Position(s) Held with Fund	Trustee/Officer Since(h)	Number of MFS Funds for which the Person is an Officer	Principal Occupations During the Past Five Years
Rosa E. Licea-Mailloux (k) (age 47)	Chief Compliance Officer	March 2022	136	Massachusetts Financial Services Company, Vice President (since 2018); Director of Corporate Compliance (2018-2021), Senior Director Compliance (2021-2022), Senior Managing Director of North American Compliance & Chief Compliance Officer (since March 2022); Natixis Investment Managers (investment management), Funds Chief Compliance Officer, Deputy General Counsel & Senior Vice President (until 2018)
Amanda S. Mooradian (k) (age 44)	Assistant Secretary and Assistant Clerk	September 2018	136	Massachusetts Financial Services Company, Assistant Vice President and Senior Counsel
Susan A. Pereira (k) (age 52)	Assistant Secretary and Assistant Clerk	July 2005	136	Massachusetts Financial Services Company, Vice President and Managing Counsel
Kasey L. Phillips (k) (age 52)	Assistant Treasurer	September 2012	136	Massachusetts Financial Services Company, Vice President
Matthew A. Stowe (k) (age 48)	Assistant Secretary and Assistant Clerk	October 2014	136	Massachusetts Financial Services Company, Vice President and Senior Managing Counsel
William B. Wilson (k) (age 41)	Assistant Secretary and Assistant Clerk	October 2022	136	Massachusetts Financial Services Company, Assistant Vice President and Senior Counsel
James O. Yost (k) (age 63)	Treasurer	September 1990	136	Massachusetts Financial Services Company, Senior Vice President

(h) Date first appointed to serve as Trustee/Officer of an MFS Fund. Each Trustee has served continuously since appointment unless indicated otherwise. From January 2012 through December 2016, Messrs. DiLorenzo and Yost served as Treasurer and Deputy Treasurer of the Funds, respectively.

(j) Directorships or trusteeships of companies required to report to the Securities and Exchange Commission (i.e., “public companies”).

(k) “Interested person” of the Trust within the meaning of the Investment Company Act of 1940 (referred to as the 1940 Act), which is the principal federal law governing investment companies like the fund, as a result of a position with MFS. The address of MFS is 111 Huntington Avenue, Boston, Massachusetts 02199-7618.

38

Trustees and Officers - continued

Each Trustee (other than Messrs. Jones, Kilman and Roberge) has been elected by shareholders and each Trustee and Officer holds office until his or her successor is chosen and qualified or until his or her earlier death, resignation, retirement or removal. Mr. Roberge became a Trustee of the Funds on January 1, 2021 and Messrs. Jones and Kilman became Trustees of the Funds on January 1, 2019. The Trust does not hold annual meetings for the purpose of electing Trustees, and Trustees are not elected for fixed terms. Under the terms of the Board's retirement policy, an Independent Trustee shall retire at the end of the calendar year in which he or she reaches the earlier of 75 years of age or 15 years of service on the Board (or, in the case of any Independent Trustee who joined the Board prior to 2015, 20 years of service on the Board).

Messrs. Buller, Kilman and Otis and Ms. Roepke are members of the Trust’s Audit Committee.

Each of the Interested Trustees and certain Officers hold comparable officer positions with certain affiliates of MFS.

The Statement of Additional Information for a Fund includes further information about the Trustees and is available without charge upon request by calling 1-800-225-2606.

Investment Adviser	Custodian
Massachusetts Financial Services Company 111 Huntington Avenue Boston, MA 02199-7618	State Street Bank and Trust Company 1 Congress Street, Suite 1 Boston, MA 02114-2016

Distributor	Independent Registered Public Accounting Firm
MFS Fund Distributors, Inc. 111 Huntington Avenue Boston, MA 02199-7618	Ernst & Young LLP 200 Clarendon Street Boston, MA 02116

Portfolio Manager(s)

Rick Gable
Mark Syn

39

Board Review of Investment Advisory Agreement

MFS Global Real Estate Fund

The Investment Company Act of 1940 requires that both the full Board of Trustees and a majority of the non-interested (“independent”) Trustees, voting separately, annually approve the continuation of the Fund’s investment advisory agreement with MFS.  The Trustees consider matters bearing on the Fund and its advisory arrangements at their meetings throughout the year, including a review of performance data at each regular meeting.  In addition, the independent Trustees met several times over the course of three months beginning in May and ending in July, 2023 (“contract review meetings”) for the specific purpose of considering whether to approve the continuation of the investment advisory agreement for the Fund and the other investment companies that the Board oversees (the “MFS Funds”).  The independent Trustees were assisted in their evaluation of the Fund’s investment advisory agreement by independent legal counsel, from whom they received separate legal advice and with whom they met separately from MFS during various contract review meetings.  The independent Trustees were also assisted in this process by an independent consultant who was retained by and reported to the independent Trustees.

In connection with their deliberations regarding the continuation of the investment advisory agreement, the Trustees, including the independent Trustees, considered such information and factors as they believed, in light of the legal advice furnished to them and their own business judgment, to be relevant.  The investment advisory agreement for the Fund was considered separately, although the Trustees also took into account the common interests of all MFS Funds in their review.  As described below, the Trustees considered the nature, quality, and extent of the various investment advisory, administrative, and shareholder services performed by MFS under the existing investment advisory agreement and other arrangements with the Fund.

In connection with their contract review meetings, the Trustees received and relied upon materials that included, among other items: (i) information provided by Broadridge Financial Solutions, Inc. (“Broadridge”), an independent third party, on the investment performance of the Fund for various time periods ended December 31, 2022 and the investment performance of a group of funds with substantially similar investment classifications/objectives (the “Broadridge performance universe”), (ii) information provided by Broadridge on the Fund’s advisory fees and other expenses and the advisory fees and other expenses of comparable funds identified by Broadridge as well as all other funds in the same investment classification/category (the “Broadridge expense group and universe”), (iii) information provided by MFS on the advisory fees of portfolios of other clients of MFS, including institutional separate accounts and other clients, (iv) information as to whether and to what extent applicable expense waivers, reimbursements or fee “breakpoints” are observed for the Fund, (v) information regarding MFS’ financial results and financial condition, including MFS’ and certain of its affiliates’ estimated profitability from services performed for the Fund and the MFS Funds as a whole, and compared to MFS’ institutional business, (vi) MFS’ views regarding the outlook for the mutual fund industry and the strategic business plans of MFS, (vii) descriptions of various functions performed by MFS for the Funds, such as compliance monitoring and portfolio trading practices, and (viii) information regarding the overall organization of MFS, including information about

40

Board Review of Investment Advisory Agreement - continued

MFS’ senior management and other personnel providing investment advisory, administrative and other services to the Fund and the other MFS Funds.  The comparative performance, fee and expense information prepared and provided by Broadridge was not independently verified and the independent Trustees did not independently verify any information provided to them by MFS.

The Trustees’ conclusion as to the continuation of the investment advisory agreement was based on a comprehensive consideration of all information provided to the Trustees and not the result of any single factor.  Some of the factors that figured particularly in the Trustees’ deliberations are described below, although individual Trustees may have evaluated the information presented differently from one another, giving different weights to various factors.  It is also important to recognize that the fee arrangements for the Fund and other MFS Funds are the result of years of review and discussion between the independent Trustees and MFS, that certain aspects of such arrangements may receive greater scrutiny in some years than in others, and that the Trustees’ conclusions may be based, in part, on their consideration of these same arrangements during the course of the year and in prior years.

Based on information provided by Broadridge and MFS, the Trustees reviewed the Fund’s total return investment performance as well as the Broadridge performance universe over various time periods.  The Trustees placed particular emphasis on the total return performance of the Fund’s Class I shares in comparison to the performance of funds in its Broadridge performance universe over the five-year period ended December 31, 2022, which the Trustees believed was a long enough period to reflect differing market conditions.  The total return performance of the Fund’s Class I shares was in the 1st quintile relative to the other funds in the universe for this five-year period (the 1st quintile being the best performers and the 5th quintile being the worst performers).  The total return performance of the Fund’s Class I shares was in the 5th quintile for the one-year period and the 1st quintile for the three-year period ended December 31, 2022 relative to the Broadridge performance universe.  Because of the passage of time, these performance results may differ from the performance results for more recent periods, including those shown elsewhere in this report.

In the course of their deliberations, the Trustees took into account information provided by MFS in connection with the contract review meetings, as well as during investment review meetings conducted with portfolio management personnel during the course of the year regarding the Fund’s performance.  After reviewing these and related factors, the Trustees concluded, within the context of their overall conclusions regarding the investment advisory agreement, that they were satisfied with MFS’ responses and efforts relating to investment performance.

In assessing the reasonableness of the Fund’s advisory fee, the Trustees considered, among other information, the Fund’s advisory fee and the total expense ratio of the Fund’s Class I shares as a percentage of average daily net assets and the advisory fee and total expense ratios of the Broadridge expense group based on information provided by Broadridge.  The Trustees considered that MFS currently observes an expense limitation for the Fund, which may not be changed without the Trustees’ approval.  The Trustees also considered that, according to the data provided by

41

Board Review of Investment Advisory Agreement - continued

Broadridge (which takes into account any fee reductions or expense limitations that were in effect during the Fund’s last fiscal year), the Fund’s effective advisory fee rate and total expense ratio were each approximately at the Broadridge expense group median.

The Trustees also considered the advisory fees charged by MFS to any institutional separate accounts advised by MFS (“separate accounts”) and unaffiliated investment companies for which MFS serves as subadviser (“subadvised funds”) that have comparable investment strategies to the Fund, if any.  In comparing these fees, the Trustees considered information provided by MFS as to the generally broader scope of services provided by MFS to the Fund, as well as the more extensive regulatory burdens imposed on MFS in managing the Fund, in comparison to separate accounts and subadvised funds.  The Trustees also considered the higher demands placed on MFS’ investment personnel and trading infrastructure as a result of the daily cash in-flows and out-flows of the Fund in comparison to separate accounts.

The Trustees also considered whether the Fund may benefit from any economies of scale in the management of the Fund in the event of growth in assets of the Fund and/or growth in assets of the MFS Funds as a whole.  They noted that the Fund’s advisory fee rate schedule is subject to contractual breakpoints that reduce the Fund’s advisory fee rate on average daily net assets over $1 billion and $2.5 billion.  The Trustees also noted that MFS has agreed in writing to waive a portion of the management fees of certain MFS Funds, including the Fund, if the total combined assets of certain funds within the MFS Funds’ complex increase above agreed upon thresholds (the “group fee waiver”), enabling the Fund’s shareholders to share in the benefits from any economies of scale at the complex level.  The group fee waiver is reviewed and renewed annually between the Board and MFS.  The Trustees concluded that the breakpoints and the group fee waiver were sufficient to allow the Fund to benefit from economies of scale as its assets and overall complex assets grow.

The Trustees also considered information prepared by MFS relating to MFS’ costs and profits with respect to the Fund, the MFS Funds considered as a group, and other investment companies and accounts advised by MFS, as well as MFS’ methodologies used to determine and allocate its costs to the MFS Funds, the Fund and other accounts and products for purposes of estimating profitability.

After reviewing these and other factors described herein, the Trustees concluded, within the context of their overall conclusions regarding the investment advisory agreement, that the advisory fees charged to the Fund represent reasonable compensation in light of the services being provided by MFS to the Fund.

In addition, the Trustees considered MFS’ resources and related efforts to continue to retain, attract and motivate capable personnel to serve the Fund.  The Trustees also considered current and developing conditions in the financial services industry, including the presence of large and well-capitalized companies which are spending, and appear to be prepared to continue to spend, substantial sums to engage personnel and to provide services to competing investment companies.  In this regard, the Trustees also considered the financial resources of MFS and its ultimate parent, Sun Life Financial Inc.  The Trustees also considered the advantages and possible disadvantages to the Fund of having an adviser that also serves other investment companies as well as other accounts.

42

Board Review of Investment Advisory Agreement - continued

The Trustees also considered the nature, quality, cost, and extent of administrative, transfer agency, and distribution services provided to the Fund by MFS and its affiliates under agreements and plans other than the investment advisory agreement, including any 12b-1 fees the Fund pays to MFS Fund Distributors, Inc., an affiliate of MFS.  The Trustees also considered the nature, extent and quality of certain other services MFS performs or arranges for on the Fund’s behalf, which may include securities lending programs, directed expense payment programs, class action recovery programs, and MFS’ interaction with third-party service providers, principally custodians and sub-custodians.  The Trustees concluded that the various non-advisory services provided by MFS and its affiliates on behalf of the Fund were satisfactory.

The Trustees considered so-called “fall-out benefits” to MFS such as reputational value derived from serving as investment manager to the MFS Funds.  The Trustees also considered that MFS discontinued its historic practice of obtaining investment research from portfolio brokerage commissions paid by certain MFS Funds effective January 2018, and directly pays or voluntarily reimburses a Fund, if applicable, for the costs of external research acquired through the use of the Fund’s portfolio brokerage commissions.

Based on their evaluation of factors that they deemed to be material, including those factors described above, the Board of Trustees, including the independent Trustees, concluded that the Fund’s investment advisory agreement with MFS should be continued for an additional one-year period, commencing August 1, 2023.

43

Statement Regarding Liquidity Risk Management Program

The fund has adopted and implemented a liquidity risk management program (the “Program”) as required by Rule 22e-4 under the Investment Company Act of 1940, as amended. The fund’s Board of Trustees (the “Board”) has designated MFS as the administrator of the Program. The Program is reasonably designed to assess and manage the liquidity risk of the fund. Liquidity risk is the risk that the fund could not meet requests to redeem shares issued by the fund without significant dilution of remaining investors' interests.

MFS provided a written report to the Board for consideration at its March 2023 meeting that addressed the operation of the Program and provided an assessment of the adequacy and effectiveness of the Program during the period from January 1, 2022 to December 31, 2022 (the “Covered Period”). The report concluded that during the Covered Period the Program had operated effectively in all material respects and had adequately and effectively been implemented to assess and manage the fund’s liquidity risk. MFS also reported that there were no liquidity events that impacted the fund or its ability to timely meet redemptions without dilution to existing shareholders during the Covered Period.

There can be no assurance that the Program will achieve its objectives in the future. Further information on liquidity risk, and other principal risks to which an investment in the fund may be subject, can be found in the prospectus.

44

Proxy Voting Policies and Information

MFS votes proxies on behalf of the fund pursuant to proxy voting policies and procedures that are available without charge, upon request, by calling 1-800-225-2606, by visiting mfs.com/proxyvoting, or by visiting the SEC’s Web site at http://www.sec.gov.

Information regarding how the fund voted proxies relating to portfolio securities during the most recent twelve-month period ended June 30 is available by August 31 of each year without charge by visiting mfs.com/proxyvoting, or by visiting the SEC’s Web site at http://www.sec.gov.

Quarterly Portfolio Disclosure

The fund files a complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The fund's Form N-PORT reports are available on the SEC's Web site at  http://www.sec.gov. A shareholder can obtain the portfolio holdings report for the first and third quarters of the fund's fiscal year at mfs.com/openendfunds by choosing the fund's name and then scrolling to the “Resources” section and clicking on the “Prospectus and Reports” tab.

Further Information

From time to time, MFS may post important information about the fund or the MFS Funds on the MFS Web site (mfs.com). This information is available at https://www.mfs.com/announcements or at mfs.com/openendfunds by choosing the fund’s name and then scrolling to the “Resources” section and clicking on the “Announcements” tab, if any.

Information About Fund Contracts and Legal Claims

The fund has entered into contractual arrangements with an investment adviser, administrator, distributor, shareholder servicing agent, and custodian who each provide services to the fund. Unless expressly stated otherwise, shareholders are not parties to, or intended beneficiaries of these contractual arrangements, and these contractual arrangements are not intended to create any shareholder right to enforce them against the service providers or to seek any remedy under them against the service providers, either directly or on behalf of the fund.

Under the Trust’s By-Laws and Declaration of Trust, any claims asserted against or on behalf of the MFS Funds, including claims against Trustees and Officers, must be brought in state and federal courts located within the Commonwealth of Massachusetts.

Federal Tax Information (unaudited)

The fund will notify shareholders of amounts for use in preparing 2023 income tax forms in January 2024. The following information is provided pursuant to provisions of the Internal Revenue Code.

The fund designates the maximum amount allowable as qualified dividend income eligible to be taxed at the same rate as long-term capital gain.

The fund designates $137,086,000 as capital gain dividends paid during the fiscal year.

The fund designates the maximum amount allowable as Section 199A dividends as defined in Proposed Treasury Regulation §1.199A-3(d).

45

rev. 3/16

FACTS WHAT DOES MFS DO WITH YOUR PERSONAL INFORMATION?

Why? Financial companies choose how they share your personal information. Federal law gives consumers the right to limit some but not all sharing. Federal law also requires us to tell you how we collect, share, and protect your personal information. Please read this notice carefully to understand what we do.

What?	The types of personal information we collect and share depend on the product or service you have with us. This information can include:
	• Social Security number and account balances
	• Account transactions and transaction history
	• Checking account information and wire transfer instructions
	When you are no longer our customer, we continue to share your information as described in this notice.

How? All financial companies need to share customers' personal information to run their everyday business. In the section below, we list the reasons financial companies can share their customers' personal information; the reasons MFS chooses to share; and whether you can limit this sharing.

Reasons we can share your personal information	Does MFS share?	Can you limit this sharing?
For our everyday business purposes – such as to process your transactions, maintain your account(s), respond to court orders and legal investigations, or report to credit bureaus	Yes	No
For our marketing purposes – to offer our products and services to you	No	We don't share
For joint marketing with other financial companies	No	We don't share
For our affiliates' everyday business purposes – information about your transactions and experiences	No	We don't share
For our affiliates' everyday business purposes – information about your creditworthiness	No	We don't share
For nonaffiliates to market to you	No	We don't share

Questions? Call 800-225-2606 or go to mfs.com.

46

Page 2

Who we are
Who is providing this notice?	MFS Funds, MFS Investment Management, MFS Institutional Advisors, Inc., and MFS Heritage Trust Company.

What we do
How does MFS protect my personal information?	To protect your personal information from unauthorized access and use, we use security measures that comply with federal law. These measures include procedural, electronic, and physical safeguards for the protection of the personal information we collect about you.
How does MFS collect my personal information?	We collect your personal information, for example, when you
	• open an account or provide account information
	• direct us to buy securities or direct us to sell your securities
	• make a wire transfer
	We also collect your personal information from others, such as credit bureaus, affiliates, or other companies.
Why can't I limit all sharing?	Federal law gives you the right to limit only
	• sharing for affiliates' everyday business purposes – information about your creditworthiness
	• affiliates from using your information to market to you
	• sharing for nonaffiliates to market to you
	State laws and individual companies may give you additional rights to limit sharing.

Definitions
Affiliates	Companies related by common ownership or control. They can be financial and nonfinancial companies.
	• MFS does not share personal information with affiliates, except for everyday business purposes as described on page one of this notice.
Nonaffiliates	Companies not related by common ownership or control. They can be financial and nonfinancial companies.
	• MFS does not share with nonaffiliates so they can market to you.
Joint marketing	A formal agreement between nonaffiliated financial companies that together market financial products or services to you.
	• MFS doesn't jointly market.

Other important information

If you own an MFS product or receive an MFS service in the name of a third party such as a bank or broker-dealer, their privacy policy may apply to you instead of ours.

47

Save paper with eDelivery.

MFS^® will send you prospectuses, reports, and proxies directly via e-mail so you will get information faster with less mailbox clutter.

To sign up:

1. Go to mfs.com.

2. Log in via MFS^® Access.

3. Select eDelivery.

If you own your MFS fund shares through a financial institution or a retirement plan, MFS^® TALK, MFS^® Access, or eDelivery may not be available to you.

CONTACT

WEB SITE

mfs.com

MFS TALK

1-800-637-8255

24 hours a day

ACCOUNT SERVICE AND LITERATURE

Shareholders

1-800-225-2606

Financial advisors

1-800-343-2829

Retirement plan services

1-800-637-1255

MAILING ADDRESS

MFS Service Center, Inc.

P.O. Box 219341

Kansas City, MO 64121-9341

OVERNIGHT MAIL

MFS Service Center, Inc.

Suite 219341

430 W 7th Street

Kansas City, MO 64105-1407

Item 1(b):

Not applicable.

ITEM 2. CODE OF ETHICS.

The Registrant has adopted a Code of Ethics (the "Code") pursuant to Section 406 of the Sarbanes-Oxley Act and as defined in Form N-CSR that applies to the Registrant's principal executive officer and principal financial and accounting officer. During the period covered by this report, the Registrant has not amended any provision in the Code that relates to an element of the Code's definition enumerated in paragraph

(b)of Item 2 of this Form N-CSR. During the period covered by this report, the Registrant did not grant a waiver, including an implicit waiver, from any provision of the Code.

A copy of the Code is attached hereto as EX-99.COE.

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

Messrs. Steven E. Buller, James Kilman, and Clarence Otis, Jr. and Ms. Maryanne L. Roepke, members of the Audit Committee, have been determined by the Board of Trustees in their reasonable business judgment to meet the definition of "audit committee financial expert" as such term is defined in Form N-CSR. In addition, Messrs. Buller, Kilman, and Otis and Ms. Roepke are "independent" members of the Audit Committee (as such term has been defined by the Securities and Exchange Commission in regulations implementing Section 407 of the Sarbanes-Oxley Act of 2002). The Securities and Exchange Commission has stated that the designation of a person as an audit committee financial expert pursuant to this Item 3 on the Form N-CSR does not impose on such a person any duties, obligations or liability that are greater than the duties, obligations or liability imposed on such person as a member of the Audit Committee and the Board of Trustees in the absence of such designation or identification.

ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Items 4(a) through 4(d) and 4(g):

The Board of Trustees has appointed Ernst & Young LLP ("E&Y") to serve as independent accountants to each series of the Registrant. The tables below set forth the audit fees billed to the series of the Registrant with a fiscal year end of August 31, 2022 (the "Fund") as well as fees for non-audit services provided to the Fund and/or to the Fund's investment adviser, Massachusetts Financial Services Company ("MFS"), and to various entities either controlling, controlled by, or under common control with MFS that provide ongoing services to the Fund ("MFS Related Entities").

For the fiscal years ended August 31, 2023 and 2022, audit fees billed to the Fund by E&Y were as follows:

Fees Billed by E&Y:		Audit Fees
	2023		2022
MFS Global Real Estate Fund	60,764		56,220

For the fiscal years ended August 31, 2023 and 2022, fees billed by E&Y for audit-related, tax and other services provided to the Fund and for audit-related, tax and other services provided to MFS and MFS Related Entities were as follows:

Fees Billed by E&Y	Audit-Related Fees1				Tax Fees2		All Other Fees3
	2023	2022			2023	2022	2023	2022
To MFS Global	0	0			636	644	0	383
Real Estate Fund
Fees Billed by E&Y	Audit-Related Fees1				Tax Fees2		All Other Fees3
	2023	2022			2023	2022	2023	2022
To MFS and MFS	0	662,511			0	0	3,600	111,415
Related Entities of MFS
Global Real Estate Fund*
Fees Billed by E&Y				Aggregate Fees for Non-audit Services
				2023			2022
To MFS Global Real Estate Fund,			228,986				955,383
MFS and MFS Related Entities #

*This amount reflects the fees billed to MFS and MFS Related Entities for non-audit services relating directly to the operations and financial reporting of the Funds (portions of which services also related to the operations and financial reporting of other funds within the MFS Funds complex).

# This amount reflects the aggregate fees billed by E&Y for non-audit services rendered to the Funds and for non-audit services rendered to MFS and the MFS Related Entities.

1 The fees included under "Audit-Related Fees" are fees related to assurance and related services that are reasonably related to the performance of the audit or review of financial statements, but not reported under ''Audit Fees,'' including accounting consultations, agreed- upon procedure reports, attestation reports, comfort letters and internal control reviews.

2 The fees included under "Tax Fees" are fees associated with tax compliance, tax advice and tax planning, including services relating to the filing or amendment of federal, state or local income tax returns, regulated investment company qualification reviews and tax distribution and analysis.

3 The fees under "All Other Fees" are fees for products and services provided by E&Y other than those reported under "Audit Fees," "Audit- Related Fees" and "Tax Fees", including fees for services related to reviews of internal controls and Rule 38a-1 compliance program.

Item 4(e)(1):

Set forth below are the policies and procedures established by the Audit Committee of the Board of Trustees relating to the pre-approval of audit and non-audit related services:

To the extent required by applicable law, pre-approval by the Audit Committee of the Board is needed for all audit and permissible non-audit services rendered to the Fund and all permissible non-audit services rendered to MFS or MFS Related Entities if the services relate directly to the operations and financial reporting of the Registrant. Pre-approval is currently on an engagement-by-engagement basis. In the event pre- approval of such services is necessary between regular meetings of the Audit Committee and it is not practical to wait to seek pre-approval at the next regular meeting of the Audit Committee, pre-approval of such services may be referred to the Chair of the Audit Committee for approval; provided that the Chair may not pre-approve any individual engagement for such services exceeding $50,000 or multiple engagements for such services in the aggregate exceeding $100,000 in each period between regular meetings of the Audit Committee. Any engagement pre-approved by the Chair between regular meetings of the Audit Committee shall be presented for ratification by the entire Audit Committee at its next regularly scheduled meeting.

Item 4(e)(2):

None, or 0%, of the services relating to the Audit-Related Fees, Tax Fees and All Other Fees paid by the Fund and MFS and MFS Related Entities relating directly to the operations and financial reporting of the Registrant disclosed above were approved by the audit committee

pursuant to paragraphs (c)(7)(i)(C) of Rule 2-01 of Regulation S-X (which permits audit committee approval after the start of the engagement with respect to services other than audit, review or attest services, if certain conditions are satisfied).

Item 4(f):

Not applicable.

Item 4(h):

The Registrant's Audit Committee has considered whether the provision by a Registrant's independent registered public accounting firm of non-audit services to MFS and MFS Related Entities that were not pre-approved by the Committee (because such services did not relate directly to the operations and financial reporting of the Registrant) was compatible with maintaining the independence of the independent registered public accounting firm as the Registrant's principal auditors.

Item 4(i):

Not applicable.

Item 4(j):

Not applicable.

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS.

Not applicable to the Registrant.

ITEM 6. INVESTMENTS

A schedule of investments for each series covered by this Form N-CSR is included as part of the report to shareholders of such series under Item 1(a) of this Form N-CSR.

ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS.

Not applicable to the Registrant.

ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

There were no material changes to the procedures by which shareholders may send recommendations to the Board for nominees to the Registrant's Board since the Registrant last provided disclosure as to such procedures in response to the requirements of Item 407 (c)(2)(iv) of Regulation S-K or this Item.

ITEM 11. CONTROLS AND PROCEDURES.

(a)Based upon their evaluation of the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the "Act")) as conducted within 90 days of the filing date of this report on Form N-CSR, the Registrant's principal financial officer and principal executive officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the Registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms.

(b)There were no changes in the Registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred during the period covered by the report that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting.

ITEM 12. DISCLOSURE OF SECURITIES LENDING ACTIVITIES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 13. EXHIBITS.

(a)(1) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit: Attached hereto as EX-99.COE.

(2)A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Act (17 CFR 270.30a-2): Attached hereto as EX-99.302CERT.

(3)Any written solicitation to purchase securities under Rule 23c-1 under the Act (17 CFR 270.23c-1) sent or given during the period covered by the report by or on behalf of the registrant to 10 or more persons. Not applicable.

(4)Change in the registrant's independent public accountant. Not applicable.

(b)If the report is filed under Section 13(a) or 15(d) of the Exchange Act, provide the certifications required by Rule 30a-2(b) under the Act (17 CFR 270.30a-2(b)), Rule 13a-14(b) or Rule 15d-14(b) under the Exchange Act (17 CFR 240.13a-14(b) or 240.15d-14(b)) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as an exhibit. A certification furnished pursuant to this paragraph will not be deemed "filed" for the purposes of Section 18 of the Exchange Act (15 U.S.C. 78r), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference. Attached hereto as EX-99.906CERT.

Notice

A copy of the Amended and Restated Declaration of Trust, as amended, of the Registrant is on file with the Secretary of State of The Commonwealth of Massachusetts and notice is hereby given that this instrument is executed on behalf of the Registrant by an officer of the Registrant as an officer and not individually and the obligations of or arising out of this instrument are not binding upon any of the Trustees or shareholders individually, but are binding only upon the assets and property of the respective constituent series of the Registrant.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) MFS SERIES TRUST XIII

By (Signature and Title)*

/S/ DAVID L. DILORENZO

David L. DiLorenzo, President

Date: October 16, 2023

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title)*

/S/ DAVID L. DILORENZO

David L. DiLorenzo, President (Principal Executive Officer)

Date: October 16, 2023

By (Signature and Title)*

/S/ JAMES O. YOST

James O. Yost, Treasurer (Principal Financial Officer and Accounting Officer) Date: October 16, 2023

* Print name and title of each signing officer under his or her signature.

EX-99.CODE ETH

EX-99.COE

Code of Ethics for Principal Executive and Principal Financial Officers

Effective February 13, 2018

I.Policy Purpose and Summary

Section 406 of the Sarbanes-Oxley Act requires that each MFS Fund registered under the Investment Company Act of 1940 disclose whether or not it has adopted a code of ethics for senior financial officers, applicable to its principal financial officer and principal accounting officer.

II.Overview

A. Covered Officers/Purpose of the Code

This code of ethics (this "Code") has been adopted by the funds (collectively, "Funds" and each, "Fund") under supervision of the MFS Funds Board (the "Board") and applies to the Funds' Principal Executive Officer and Principal Financial Officer (the "Covered Officers" each of whom is set forth in Exhibit A) for the purpose of promoting:

∙honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

∙full, fair, accurate, timely and understandable disclosure in reports and documents that the Funds file with, or submit to, the Securities and Exchange Commission ("SEC") and in other public communications made by the Funds;

∙compliance by the Funds with applicable laws and governmental rules and regulations;

∙the prompt internal reporting of violations of the Code to an appropriate person or persons identified in the Code; and

∙accountability for adherence to the Code.

B. Conduct Guidelines

Each Covered Officer should adhere to a high standard of business ethics and should be sensitive to situations that may give rise to actual as well as apparent conflicts of interest. In addition, each Covered Officer should not place his or her personal interests ahead of the Funds' interests and should endeavor to act honestly and ethically. In furtherance of the foregoing, each Covered Officer must:

∙not use his or her personal influence or personal relationships improperly to influence investment decisions or financial reporting for any Fund whereby the Covered Officer would benefit personally to the detriment of the Fund; and

∙not cause a Fund to take action, or fail to take action, for the individual personal benefit of the Covered Officer rather than the benefit the Fund.

The following activities, which could create the appearance of a conflict of interest, are permitted only with the approval of the Funds' Chief Legal Officer ("CLO"):

∙service as a director on the board of any "for profit" company other than the board of the Funds' investment adviser or its subsidiaries or board of a pooled investment vehicle sponsored by the Funds' investment adviser or its subsidiaries;

∙running for political office;

∙the receipt of any Fund business-related gift or any entertainment from any company with which a Fund has current or prospective business dealings unless such gift or entertainment is permitted by the gifts and entertainment policy of the Funds' investment adviser;

∙any material ownership interest in, or any consulting or employment relationship with, any Fund service providers (e.g., custodian banks, audit firms), other than the Funds' investment adviser, principal underwriter, administrator or any affiliated person thereof;

∙a direct or indirect financial interest in commissions, transaction charges or spreads paid by a Fund for effecting portfolio transactions or for selling or redeeming shares, other than an interest arising from the Covered Officer's employment or securities ownership.

C.Disclosure and Compliance

∙Each Covered Officer should familiarize himself or herself with the disclosure requirements generally applicable to the Funds;

∙each Covered Officer should not knowingly misrepresent, or cause others to misrepresent, facts about a Fund to others, whether within or outside the Fund, including to the Fund's trustees and auditors, and to governmental regulators and self-regulatory organizations;

∙each Covered Officer should, to the extent appropriate within his or her area of Fund responsibility, consult with other officers and employees of the Funds and the adviser with the goal of promoting full, fair, accurate, timely and understandable disclosure in the reports and documents the Funds file with, or submit to, the SEC and in other public communications made by the Funds; and

∙it is the responsibility of each Covered Officer to promote compliance within his or her area of Fund responsibility with the standards and restrictions imposed by applicable laws, rules and regulations.

D. Reporting and Accountability

Each Covered Officer must:

∙upon adoption of the Code (or thereafter as applicable, upon becoming a Covered Officer), affirm in writing to the Board that he or she has received, read, and understands the Code;

∙annually thereafter affirm to the Board that he or she has complied with the requirements of the Code;

∙annually report to the CLO affiliations and relationships which are or may raise the appearance of a conflict of interest with the Covered Officer's duties to the Funds, as identified in the annual Trustee and Officer Questionnaire;

∙not retaliate against any other Covered Officer or any officer or employee of the Funds or their affiliated persons for reports of potential violations that are made in good faith; and

∙notify the CLO promptly if he or she knows of any violation of this Code. Failure to do so is itself a violation of this Code.

The CLO is responsible for applying this Code to specific situations in which questions are presented under it, granting waivers upon consultation with the Board or its designee, investigating violations, and has the authority to interpret this Code in any particular situation. The CLO will report requests for waivers to the Board (or a designee thereof) promptly upon receipt of a waiver request and will periodically report to the Board any approvals granted since the last report.

The CLO will take all appropriate action to investigate any potential violations reported to him or her and to report any violations to the Board. If the Board concurs that a violation has occurred, it will consider appropriate action, which may include review of, and appropriate modifications to, applicable policies and procedures; notification to appropriate personnel of the investment adviser or its board; or a recommendation to dismiss the Covered Officer.

Any changes to or waivers of this Code will, to the extent required, be disclosed as provided by SEC rules.

E. Confidentiality

All reports and records prepared or maintained pursuant to this Code and under the direction of the CLO will be considered confidential and shall be maintained and protected accordingly. Except as otherwise required by law or this Code, such matters shall not be disclosed to anyone other than the Funds' Board, its counsel, counsel to the Board's independent trustees and senior management and the board of directors of the Fund's investment adviser and its counsel.

F. Internal Use

The Code is intended solely for the internal use by the Funds and does not constitute an admission, by or on behalf of any Fund, as to any fact, circumstance, or legal conclusion.

III.Supervision

The Board of Trustees of the Funds, including a majority of the Trustees who are not "interested persons" (as defined in the 1940 Act) of the Funds, shall review no less frequently than annually, a report from the CLO regarding the affirmations of the principal executive officer and the principal financial officer as to compliance with this Code.

IV.	Interpretation and Escalation
	Breaches of the Code are reviewed by the CLO and communicated to the Board of
	Trustees of the affected Fund(s). Interpretations of this Policy shall be made from time
	to time by the CLO, as needed, and questions regarding the application of this Policy to
	a specific set of facts are escalated to the CLO.

V.Authority

Section 406 of the Sarbanes-Oxley Act.

VI. Monitoring

Adherence to this policy is monitored by the CLO.

VII. Related Policies

This Code shall be the sole code of ethics adopted by the Funds for purposes of Section 406 of the Sarbanes-Oxley Act and the rules and forms applicable to registered investment companies thereunder. Insofar as other policies or procedures of the Funds, the Funds' adviser, principal underwriter, or other service providers govern or purport to govern the behavior or activities of the Covered Officers who are subject to this Code, they are superseded by this Code to the extent that they overlap or conflict with the provisions of this Code. The Funds' and their investment adviser's codes of ethics under Rule 17j-1 under the Investment Company Act and any other codes or policies or procedures adopted by the Funds or their investment adviser or other service providers are separate requirements and are not part of this Code.

VIII. Amendment

Any amendments to this Code, other than amendments to Exhibit A, must be approved or ratified by a majority vote of the Board, including a majority of independent trustees.

IX. Recordkeeping

All required books, records and other documentation shall be retained in accordance with MFS' related record retention policy.

Additional procedures may need to be implemented by departments to properly comply with this policy.

Exhibit A

As of January 1, 2017

Persons Covered by this Code of Ethics

Funds' Principal Executive Officer: David L. DiLorenzo

Funds' Principal Financial Officer: James O. Yost

EX-99.302 CERT

EX-99.302CERT

MFS SERIES TRUST XIII

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act

I, James O. Yost, certify that:

1.I have reviewed this report on Form N-CSR of MFS Series Trust XIII;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the period covered by the report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 16, 2023

/S/ JAMES O. YOST

James O. Yost

Treasurer (Principal Financial Officer and Accounting Officer)

EX-99.302CERT

MFS SERIES TRUST XIII

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act

I, David L. DiLorenzo, certify that:

1.I have reviewed this report on Form N-CSR of MFS Series Trust XIII;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the period covered by the report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 16, 2023

/S/ DAVID L. DILORENZO

David L. DiLorenzo

President (Principal Executive Officer)

EX-99.906 CERT

EX-99.906CERT

MFS SERIES TRUST XIII

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act

I, James O. Yost, certify that, to my knowledge:

1.The Form N-CSR (the "Report") of MFS Series Trust XIII (the "Registrant") fully complies for the period covered by the Report with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: October 16, 2023

/S/ JAMES O. YOST

James O. Yost

Treasurer (Principal Financial Officer and Accounting Officer)

A signed original of this written statement required by Section 906 has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-99.906CERT

MFS SERIES TRUST XIII

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act

I, David L. DiLorenzo, certify that, to my knowledge:

1.The Form N-CSR (the "Report") of MFS Series Trust XIII (the "Registrant") fully complies for the period covered by the Report with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: October 16, 2023

/S/ DAVID L. DILORENZO

David L. DiLorenzo

President (Principal Executive Officer)

A signed original of this written statement required by Section 906 has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.