# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0001752724-23-011788
**Filing Date:** 2023-1
**Character Count:** 61666
**Document Hash:** c59b378427a3c469044e6d6382f17e0a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-23-011788.hdr.sgml**: 20230125

**ACCESSION NUMBER**: 0001752724-23-011788

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20221130

**FILED AS OF DATE**: 20230125

**DATE AS OF CHANGE**: 20230125

**PERIOD START**: 20230831

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST IV
- **CENTRAL INDEX KEY:** 0000063068
- **IRS NUMBER:** 046382595
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02594
- **FILM NUMBER:** 23550819

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

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS MUNICIPAL BOND FUND /MA/
- **DATE OF NAME CHANGE:** 19930910

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASSACHUSETTS CASH MANAGEMENT TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS Mid Cap Growth Fund (Series ID: S000002434)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006504 | A            | OTCAX           |
| C000006505 | R4           | OTCJX           |
| C000006509 | B            | OTCBX           |
| C000006510 | C            | OTCCX           |
| C000006511 | I            | OTCIX           |
| C000006513 | R1           | OTCGX           |
| C000006515 | R2           | MCPRX           |
| C000006516 | R3           | OTCHX           |
| C000124428 | R6           | OTCKX           |

## Nport-Ex

![](imgb75473801.gif)

### Quarterly Report
November 30, 2022

MFS<sup>®</sup> Mid Cap Growth Fund

![](img7c6cd9142.gif)

OTC-Q1

------

### Portfolio of Investments
11/30/22 (unaudited)

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** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – 97.9% | Common Stocks – 97.9% | Common Stocks – 97.9% |
| Aerospace & Defense – 1.4% | Aerospace & Defense – 1.4% |  |
| Howmet Aerospace, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;4836822 | $182203085 |
| Automotive – 2.6% | Automotive – 2.6% |  |
| Copart, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2925176 | $194699714 |
| LKQ Corp. | &nbsp;&nbsp;&nbsp;&nbsp;2743323 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;149044739 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$343744453 |
| Brokerage & Asset Managers – 2.2% | Brokerage & Asset Managers – 2.2% |  |
| NASDAQ, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;4218615 | $288806383 |
| Business Services – 12.7% | Business Services – 12.7% |  |
| Clarivate PLC (a) | &nbsp;&nbsp;&nbsp;&nbsp;4901118 | $47981945 |
| CoStar Group, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2928207 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;237301895 |
| Endava PLC, ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;274230 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21036183 |
| Equifax, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;947511 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;187010246 |
| Factset Research Systems, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;235580 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;108670698 |
| Morningstar, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;419498 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;102831545 |
| MSCI, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;786225 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;399268642 |
| Thoughtworks Holding, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;1629960 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14865235 |
| TransUnion | &nbsp;&nbsp;&nbsp;&nbsp;1596657 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;100717124 |
| Tyler Technologies, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;486338 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;166687486 |
| Verisk Analytics, Inc., "A" | &nbsp;&nbsp;&nbsp;&nbsp;1648092 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;302770982 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;$1689141981 |
| Computer Software – 11.1% | Computer Software – 11.1% |  |
| Autodesk, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;454297 | $91745279 |
| Black Knight, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2751842 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;170586686 |
| Bumble, Inc., "A" (a) | &nbsp;&nbsp;&nbsp;&nbsp;1516621 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;36944888 |
| Cadence Design Systems, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2507467 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;431384623 |
| CCC Intelligent Holdings, Inc. (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;3130275 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;28798530 |
| CCC Intelligent Holdings, Inc. (PIPE) (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;452972 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4167342 |
| Dun & Bradstreet Holdings, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;7509809 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;101082029 |
| NICE Systems Ltd., ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;1057002 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;205238078 |
| Paylocity Holding Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;846464 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;184385253 |
| Synopsys, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;641048 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;217661438 |
| Topicus.Com, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;224909 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;12506555 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;$1484500701 |
| Computer Software - Systems – 2.5% | Computer Software - Systems – 2.5% |  |
| Constellation Software, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;119671 | $192921947 |
| ServiceNow, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;335597 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;139709031 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$332630978 |
| Construction – 3.6% | Construction – 3.6% |  |
| AZEK Co., Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;3131534 | $60563867 |
| Pool Corp. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;417746 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;137609710 |
| Vulcan Materials Co. | &nbsp;&nbsp;&nbsp;&nbsp;1520821 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;278812114 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$476985691 |
| Consumer Products – 0.9% | Consumer Products – 0.9% |  |
| Church & Dwight Co., Inc. | &nbsp;&nbsp;&nbsp;&nbsp;1532052 | $125429097 |
| Consumer Services – 1.2% | Consumer Services – 1.2% |  |
| Bright Horizons Family Solutions, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2241710 | $166334882 |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – continued | Common Stocks – continued | Common Stocks – continued |
| Containers – 0.4% | Containers – 0.4% |  |
| Ball Corp. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;942233 | $52840427 |
| Electrical Equipment – 3.4% | Electrical Equipment – 3.4% |  |
| AMETEK, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;2374989 | $338245933 |
| Littlefuse, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;450137 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;110958771 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$449204704 |
| Electronics – 4.0% | Electronics – 4.0% |  |
| ASM International N.V. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;416512 | $116913581 |
| Entegris, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;1322156 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;102189437 |
| Monolithic Power Systems, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;832047 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;317808672 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$536911690 |
| Energy - Independent – 2.6% | Energy - Independent – 2.6% |  |
| Chesapeake Energy Corp. | &nbsp;&nbsp;&nbsp;&nbsp;1116797 | $115588490 |
| Diamondback Energy, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;800498 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;118489714 |
| Hess Corp. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;823996 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;118581264 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$352659468 |
| Energy - Renewables – 1.0% | Energy - Renewables – 1.0% |  |
| Enphase Energy, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;421196 | $135031226 |
| Gaming & Lodging – 2.1% | Gaming & Lodging – 2.1% |  |
| Hyatt Hotels Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;1560883 | $156587783 |
| Red Rock Resorts, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;2646106 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;119233536 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$275821319 |
| General Merchandise – 0.8% | General Merchandise – 0.8% |  |
| Five Below, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;650502 | $104639752 |
| Insurance – 3.1% | Insurance – 3.1% |  |
| Arthur J. Gallagher & Co. | &nbsp;&nbsp;&nbsp;&nbsp;2049390 | $408054043 |
| Internet – 2.6% | Internet – 2.6% |  |
| Gartner, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;671410 | $235241921 |
| Match Group, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;2152971 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;108854214 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$344096135 |
| Leisure & Toys – 1.7% | Leisure & Toys – 1.7% |  |
| Electronic Arts, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;457479 | $59829104 |
| Take-Two Interactive Software, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;1532032 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;161920462 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$221749566 |
| Machinery & Tools – 2.5% | Machinery & Tools – 2.5% |  |
| IDEX Corp. | &nbsp;&nbsp;&nbsp;&nbsp;1004464 | $238550156 |
| Wabtec Corp. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;987059 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;99781794 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$338331950 |
| Medical & Health Technology & Services – 4.4% | Medical & Health Technology & Services – 4.4% |  |
| Charles River Laboratories International, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;140398 | $32090771 |
| Guardant Health, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;456108 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;23872693 |
| Henry Schein, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;1489916 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;120564003 |
| ICON PLC (a) | &nbsp;&nbsp;&nbsp;&nbsp;1141554 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;245936394 |
| IDEXX Laboratories, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;243989 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;103907595 |
| Veeva Systems, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;291920 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;55569891 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$581941347 |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – continued | Common Stocks – continued | Common Stocks – continued |
| Medical Equipment – 12.5% | Medical Equipment – 12.5% |  |
| Agilent Technologies, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;1713918 | $265623011 |
| Align Technology, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;251257 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;49412201 |
| Bio-Techne Corp. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;870912 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;74018811 |
| Bruker BioSciences Corp. | &nbsp;&nbsp;&nbsp;&nbsp;2170348 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;146303159 |
| Envista Holdings Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;5297095 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;180736881 |
| Maravai Lifesciences Holdings, Inc., "A" (a) | &nbsp;&nbsp;&nbsp;&nbsp;3239032 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;48196796 |
| Mettler-Toledo International, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;81286 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;119454654 |
| PerkinElmer, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;1912882 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;267287002 |
| Repligen Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;210332 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;37615775 |
| STERIS PLC | &nbsp;&nbsp;&nbsp;&nbsp;1535705 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;285241847 |
| Waters Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;434593 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;150629934 |
| West Pharmaceutical Services, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;187836 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;44077596 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;$1668597667 |
| Other Banks & Diversified Financials – 0.2% | Other Banks & Diversified Financials – 0.2% |  |
| S&P Global, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;68489 | $24162919 |
| Pharmaceuticals – 1.8% | Pharmaceuticals – 1.8% |  |
| Alnylam Pharmaceuticals, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;479211 | $105709154 |
| Ascendis Pharma, ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;1092061 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134389027 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$240098181 |
| Pollution Control – 1.7% | Pollution Control – 1.7% |  |
| Waste Connections, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;1613811 | $233195689 |
| Printing & Publishing – 2.4% | Printing & Publishing – 2.4% |  |
| Warner Music Group Corp. | &nbsp;&nbsp;&nbsp;&nbsp;2043334 | $70025056 |
| Wolters Kluwer N.V. | &nbsp;&nbsp;&nbsp;&nbsp;2239643 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;247380853 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$317405909 |
| Railroad & Shipping – 0.2% | Railroad & Shipping – 0.2% |  |
| Canadian Pacific Railway Ltd. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;290201 | $23770364 |
| Real Estate – 1.6% | Real Estate – 1.6% |  |
| Extra Space Storage, Inc., REIT | &nbsp;&nbsp;&nbsp;&nbsp;1358488 | $218295437 |
| Restaurants – 2.1% | Restaurants – 2.1% |  |
| Chipotle Mexican Grill, Inc., "A" (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;111441 | $181310049 |
| Domino's Pizza, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;265754 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;103306553 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$284616602 |
| Specialty Stores – 7.3% | Specialty Stores – 7.3% |  |
| Burlington Stores, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;383595 | $75061870 |
| Lululemon Athletica, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;495204 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;188331033 |
| O'Reilly Automotive, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;350661 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;303160461 |
| Tractor Supply Co. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;735632 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;166480878 |
| Ulta Beauty, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;508760 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;236491998 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$969526240 |
| Telecommunications - Wireless – 1.3% | Telecommunications - Wireless – 1.3% |  |
| SBA Communications Corp., REIT | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;575964 | $172386025 |
| **Total Common Stocks** |  | &nbsp;&nbsp;**$13043113911** |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Investment Companies (h) – 2.0% | Investment Companies (h) – 2.0% | Investment Companies (h) – 2.0% |
| Money Market Funds – 2.0% | Money Market Funds – 2.0% |  |
| MFS Institutional Money Market Portfolio, 3.67% (v) | 268685324 | &nbsp;&nbsp;&nbsp;$268685324 |
| Other Assets, Less Liabilities – 0.1% |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7707346 |
| **Net Assets – 100.0%** | **Net Assets – 100.0%** | &nbsp;&nbsp;&nbsp;**$13319506581** |

---

(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 $268,685,324 and $13,043,113,911, respectively.

(l) A portion of this security is on loan. See Note 2 for additional information.

(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: | The following abbreviations are used in this report and are defined: |
| ADR | American Depositary Receipt |
| PIPE | Private Investment in Public Equity |
| REIT | Real Estate Investment Trust |

---

See attached supplemental information. For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

------

### Supplemental Information
11/30/22 (unaudited)

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.

(1) 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 Board. Effective September 8, 2022, and 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.

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 November 30, 2022 in valuing the fund's assets and liabilities:

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Financial Instruments** | &nbsp;&nbsp;&nbsp;**Level 1** | &nbsp;&nbsp;&nbsp;**Level 2** | &nbsp;&nbsp;&nbsp;**Level 3** | &nbsp;&nbsp;&nbsp;**Total** |
| Equity Securities: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;United States | &nbsp;&nbsp;&nbsp;$11851594292 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$4167342 | &nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;$11855761634 |
| &nbsp;&nbsp;&nbsp;Canada | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;462394555 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;462394555 |
| &nbsp;&nbsp;&nbsp;Netherlands | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;364294434 | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;364294434 |
| &nbsp;&nbsp;&nbsp;Israel | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;205238078 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;205238078 |
| &nbsp;&nbsp;&nbsp;Denmark | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134389027 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134389027 |
| &nbsp;&nbsp;&nbsp;United Kingdom | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21036183 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21036183 |
| Mutual Funds | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;268685324 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;268685324 |
| Total | &nbsp;&nbsp;&nbsp;$12943337459 | &nbsp;&nbsp;&nbsp;$368461776 | &nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;$13311799235 |

---

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

------

Supplemental Information (unaudited) – continued

(2) Securities Lending Collateral

At November 30, 2022, the value of securities loaned was $184,000. These loans were collateralized by U.S. Treasury Obligations (held by the lending agent) of $182,717.

(3) 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** | &nbsp;&nbsp;**Beginning<br> Value** | &nbsp;&nbsp;**Purchases** | &nbsp;&nbsp;**Sales<br> Proceeds** | &nbsp;&nbsp;**Realized<br> Gain<br> (Loss)** | &nbsp;&nbsp;**Change in<br> Unrealized<br> Appreciation or<br> Depreciation** | &nbsp;&nbsp;**Ending<br> Value** |
| MFS Institutional Money Market Portfolio | &nbsp;&nbsp;$457382967 | &nbsp;&nbsp;$267404916 | &nbsp;&nbsp;$456100078 | &nbsp;&nbsp;$(8678) | &nbsp;&nbsp;$6197 | &nbsp;&nbsp;$268685324 |

---

---

| | | |
|:---|:---|:---|
| **Affiliated Issuers** | &nbsp;&nbsp;**Dividend<br> Income** | &nbsp;&nbsp;**Capital Gain<br> Distributions** |
| MFS Institutional Money Market Portfolio | &nbsp;&nbsp;$2680152 | &nbsp;&nbsp;$— |

---

(4) Russia and Ukraine Conflict

The market disruptions, which began in late February 2022, associated with geopolitical events related to the conflict between Russia and Ukraine may adversely affect the value of the fund's assets and thus the fund's performance. Management continues to monitor these events and to evaluate the related impacts, if any, to the fund.

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** MFS Series Trust IV

- **b. Investment Company Act file number:** 811-02594

- **c. CIK number of Registrant:** 0000063068

- **d. LEI of Registrant:** 549300SSA281MOJG8J61

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 111 Huntington Avenue

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02199

  - **Telephone number:** 617-954-5000

**Item A.2. Information about the Series.**

- **a. Name of Series:** MFS Mid Cap Growth Fund

- **b. EDGAR series identifier (if any):** S000002434

- **c. LEI of Series:** XPX0WXKIO6CLKBLYF666

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2023-08-31

- **b. Date as of which information is reported:** 2022-11-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $13329188245.59

**Total Liabilities:** $9681754.67

**Net Assets:** $13319506490.92

**Cash Not Reported:** $9.17

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006513 | -8.56%               | 5.51%                | 6.99%                |
| Class ID C000006516 | -8.48%               | 5.56%                | 7.07%                |
| Class ID C000006511 | -8.45%               | 5.54%                | 7.08%                |
| Class ID C000006509 | -8.56%               | 5.48%                | 7.01%                |
| Class ID C000124428 | -8.44%               | 5.57%                | 7.09%                |
| Class ID C000006505 | -8.45%               | 5.54%                | 7.09%                |
| Class ID C000006515 | -8.50%               | 5.54%                | 7.03%                |
| Class ID C000006510 | -8.51%               | 5.48%                | 6.95%                |
| Class ID C000006504 | -8.47%               | 5.57%                | 7.02%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-61506831.41            | $-1052158687.68                            |
| Month 2  | $22027762.59             | $652195768.61                              |
| Month 3  | $-88296580.29            | $963765143.41                              |

### Schedule of Portfolio Investments

| Name                                           | Title                                             | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Entegris, Inc.                                 | Entegris, Inc.                                    | CUSIP: 29362U104<br>LEI: IYX6OWO7BT5DKO3BYG52 | Long             | EC               | CORP              | US        |   1322156 | NS      | $102189437.24 | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| Match Group, Inc.                              | Match Group, Inc.                                 | CUSIP: 57667L107<br>LEI: 15OMOPB0A8K0EFUVD031 | Long             | EC               | CORP              | US        |   2152971 | NS      | $108854213.76 | 0.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Cadence Design Systems, Inc.                   | Cadence Design Systems, Inc.                      | CUSIP: 127387108<br>LEI: GCT7RXJOGLXPV0NXZY22 | Long             | EC               | CORP              | US        |   2507467 | NS      | $431384622.68 | 3.24%             |  |  |  | No            |                  1 | On Loan: No      |
| Pool Corp.                                     | Pool Corp.                                        | CUSIP: 73278L105<br>LEI: 5493005VZK1KMN6CO617 | Long             | EC               | CORP              | US        |    417746 | NS      | $137609709.86 | 1.03%             |  |  |  | No            |                  1 | On Loan: No      |
| Vulcan Materials Co.                           | Vulcan Materials Co.                              | CUSIP: 929160109<br>LEI: 549300Q8LSNHAVWBNI21 | Long             | EC               | CORP              | US        |   1520821 | NS      | $278812113.93 | 2.09%             |  |  |  | No            |                  1 | On Loan: No      |
| AMETEK, Inc.                                   | AMETEK, Inc.                                      | CUSIP: 031100100<br>LEI: 549300WZDEF9KKE40E98 | Long             | EC               | CORP              | US        |   2374989 | NS      | $338245933.38 | 2.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Warner Music Group Corp.                       | Warner Music Group Corp., Class A                 | CUSIP: 934550203<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   2043334 | NS      | $70025056.18  | 0.53%             |  |  |  | No            |                  1 | On Loan: No      |
| CoStar Group, Inc.                             | CoStar Group, Inc.                                | CUSIP: 22160N109<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   2928207 | NS      | $237301895.28 | 1.78%             |  |  |  | No            |                  1 | On Loan: No      |
| Equifax, Inc.                                  | Equifax, Inc.                                     | CUSIP: 294429105<br>LEI: 5493004MCF8JDC86VS77 | Long             | EC               | CORP              | US        |    947511 | NS      | $187010246.07 | 1.40%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio       | MFS Institutional Money Market Portfolio, Class A | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | STIV             | RF                | US        | 267779846 | NS      | $267779846.32 | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Waters Corp.                                   | Waters Corp.                                      | CUSIP: 941848103<br>LEI: 5T547R1474YC9HOD8Q74 | Long             | EC               | CORP              | US        |    434593 | NS      | $150629933.80 | 1.13%             |  |  |  | No            |                  1 | On Loan: No      |
| Howmet Aerospace, Inc.                         | Howmet Aerospace, Inc.                            | CUSIP: 443201108<br>LEI: 549300HO5WFZUT5N2T22 | Long             | EC               | CORP              | US        |   4836822 | NS      | $182203084.74 | 1.37%             |  |  |  | No            |                  1 | On Loan: No      |
| Repligen Corp.                                 | Repligen Corp.                                    | CUSIP: 759916109<br>LEI: 54930006QJ0T5AUO1E71 | Long             | EC               | CORP              | US        |    210332 | NS      | $37615774.88  | 0.28%             |  |  |  | No            |                  1 | On Loan: No      |
| SBA Communications Corp.                       | SBA Communications Corp.                          | CUSIP: 78410G104<br>LEI: 5299001HX8ZN8Y8QIT49 | Long             | EC               | CORP              | US        |    575964 | NS      | $172386025.20 | 1.29%             |  |  |  | No            |                  1 | On Loan: No      |
| Mettler-Toledo International, Inc.             | Mettler-Toledo International, Inc.                | CUSIP: 592688105<br>LEI: 5493000BD5GJNUDIUG10 | Long             | EC               | CORP              | US        |     81286 | NS      | $119454654.16 | 0.90%             |  |  |  | No            |                  1 | On Loan: No      |
| Charles River Laboratories International, Inc. | Charles River Laboratories International, Inc.    | CUSIP: 159864107<br>LEI: 549300BSQ0R4UZ5KX287 | Long             | EC               | CORP              | US        |    140398 | NS      | $32090770.86  | 0.24%             |  |  |  | No            |                  1 | On Loan: No      |
| ICON plc                                       | ICON plc                                          | CUSIP: N/A<br>LEI: 6354008SRQGEMC4XFI67       | Long             | EC               | CORP              | IE        |   1141554 | NS      | $245936393.76 | 1.85%             |  |  |  | No            |                  1 | On Loan: No      |
| Chesapeake Energy Corp.                        | Chesapeake Energy Corp.                           | CUSIP: 165167735<br>LEI: X2MT1W32SPAZ9WSKLE78 | Long             | EC               | CORP              | US        |   1116797 | NS      | $115588489.50 | 0.87%             |  |  |  | No            |                  1 | On Loan: No      |
| Gartner, Inc.                                  | Gartner, Inc.                                     | CUSIP: 366651107<br>LEI: PP55B5R38BFB8O8HH686 | Long             | EC               | CORP              | US        |    671410 | NS      | $235241921.70 | 1.77%             |  |  |  | No            |                  1 | On Loan: No      |
| Bio-Techne Corp.                               | Bio-Techne Corp.                                  | CUSIP: 09073M104<br>LEI: 54930073RLKQ51TILZ35 | Long             | EC               | CORP              | US        |    870912 | NS      | $74018810.88  | 0.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Bright Horizons Family Solutions, Inc.         | Bright Horizons Family Solutions, Inc.            | CUSIP: 109194100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   2241710 | NS      | $166334882.00 | 1.25%             |  |  |  | No            |                  1 | On Loan: No      |
| Lululemon Athletica, Inc.                      | Lululemon Athletica, Inc.                         | CUSIP: 550021109<br>LEI: 549300D9GZ4BMLDW5T40 | Long             | EC               | CORP              | US        |    495204 | NS      | $188331033.24 | 1.41%             |  |  |  | No            |                  1 | On Loan: No      |
| LKQ Corp.                                      | LKQ Corp.                                         | CUSIP: 501889208<br>LEI: DS830JTTZQN6GK0I2E41 | Long             | EC               | CORP              | US        |   2743323 | NS      | $149044738.59 | 1.12%             |  |  |  | No            |                  1 | On Loan: No      |
| Morningstar, Inc.                              | Morningstar, Inc.                                 | CUSIP: 617700109<br>LEI: 529900YGNQPOVAXQ7F29 | Long             | EC               | CORP              | US        |    419498 | NS      | $102831544.74 | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| Topicus.com, Inc.                              | Topicus.com, Inc.                                 | CUSIP: 89072T102<br>LEI: N/A                  | Long             | EC               | CORP              | CA        |    224909 | NS      | $12506555.55  | 0.09%             |  |  |  | No            |                  1 | On Loan: No      |
| Bruker Corp.                                   | Bruker Corp.                                      | CUSIP: 116794108<br>LEI: LEBZ6VLQ6I8XB1NHVY15 | Long             | EC               | CORP              | US        |   2170348 | NS      | $146303158.68 | 1.10%             |  |  |  | No            |                  1 | On Loan: No      |
| Paylocity Holding Corp.                        | Paylocity Holding Corp.                           | CUSIP: 70438V106<br>LEI: 549300VH75FTB4DIEE07 | Long             | EC               | CORP              | US        |    846464 | NS      | $184385253.12 | 1.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Westinghouse Air Brake Technologies Corp.      | Westinghouse Air Brake Technologies Corp.         | CUSIP: 929740108<br>LEI: 06BTX5UWZD0GQ5N5Y745 | Long             | EC               | CORP              | US        |    987059 | NS      | $99781794.31  | 0.75%             |  |  |  | No            |                  1 | On Loan: No      |
| Enphase Energy, Inc.                           | Enphase Energy, Inc.                              | CUSIP: 29355A107<br>LEI: 5493008U7KIGMI59Z314 | Long             | EC               | CORP              | US        |    421196 | NS      | $135031225.64 | 1.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Nice Ltd.                                      | Nice Ltd.                                         | CUSIP: 653656108<br>LEI: 254900YTY4EF5Z4W0A51 | Long             | EC               | CORP              | IL        |   1057002 | NS      | $205238078.34 | 1.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Church & Dwight Co., Inc.                      | Church & Dwight Co., Inc.                         | CUSIP: 171340102<br>LEI: POOXSI30AWAQGYJZC921 | Long             | EC               | CORP              | US        |   1532052 | NS      | $125429097.24 | 0.94%             |  |  |  | No            |                  1 | On Loan: No      |
| Chipotle Mexican Grill, Inc.                   | Chipotle Mexican Grill, Inc.                      | CUSIP: 169656105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    111441 | NS      | $181310049.36 | 1.36%             |  |  |  | No            |                  1 | On Loan: No      |
| Hess Corp.                                     | Hess Corp.                                        | CUSIP: 42809H107<br>LEI: UASVRYNXNK17ULIGK870 | Long             | EC               | CORP              | US        |    823996 | NS      | $118581264.36 | 0.89%             |  |  |  | No            |                  1 | On Loan: No      |
| PerkinElmer, Inc.                              | PerkinElmer, Inc.                                 | CUSIP: 714046109<br>LEI: 549300IKL1SDPFI7N655 | Long             | EC               | CORP              | US        |   1912882 | NS      | $267287001.86 | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Veeva Systems, Inc.                            | Veeva Systems, Inc., Class A                      | CUSIP: 922475108<br>LEI: 549300YZEXPDB92M2F02 | Long             | EC               | CORP              | US        |    291920 | NS      | $55569891.20  | 0.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Wolters Kluwer NV                              | Wolters Kluwer NV                                 | CUSIP: N/A<br>LEI: 724500TEM53I0U077B74       | Long             | EC               | CORP              | NL        |   2239643 | NS      | $247380853.29 | 1.86%             |  |  |  | No            |                  2 | On Loan: No      |
| Autodesk, Inc.                                 | Autodesk, Inc.                                    | CUSIP: 052769106<br>LEI: FRKKVKAIQEF3FCSTPG55 | Long             | EC               | CORP              | US        |    454297 | NS      | $91745279.15  | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| Endava plc                                     | Endava plc                                        | CUSIP: 29260V105<br>LEI: 213800JJ6CRPCWCQVZ25 | Long             | EC               | CORP              | GB        |    274230 | NS      | $21036183.30  | 0.16%             |  |  |  | No            |                  1 | On Loan: No      |
| Red Rock Resorts, Inc.                         | Red Rock Resorts, Inc., Class A                   | CUSIP: 75700L108<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   2646106 | NS      | $119233536.36 | 0.90%             |  |  |  | No            |                  1 | On Loan: No      |
| MSCI, Inc.                                     | MSCI, Inc.                                        | CUSIP: 55354G100<br>LEI: 549300HTIN2PD78UB763 | Long             | EC               | CORP              | US        |    786225 | NS      | $399268641.75 | 3.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Diamondback Energy, Inc.                       | Diamondback Energy, Inc.                          | CUSIP: 25278X109<br>LEI: 549300R22LSX6OHWEN64 | Long             | EC               | CORP              | US        |    800498 | NS      | $118489713.96 | 0.89%             |  |  |  | No            |                  1 | On Loan: No      |
| CCC Intelligent Solutions Holdings, Inc.       | CCC Intelligent Solutions Holdings, Inc.          | CUSIP: N/A<br>LEI: N/A                        | Long             | EC               | CORP              | US        |    452972 | NS      | $4167342.40   | 0.03%             |  |  |  | No            |                  2 | On Loan: No      |
| ASM International NV                           | ASM International NV                              | CUSIP: N/A<br>LEI: 7245001I22ND6ZFHX623       | Long             | EC               | CORP              | NL        |    416512 | NS      | $116913580.42 | 0.88%             |  |  |  | No            |                  2 | On Loan: No      |
| S&P Global, Inc.                               | S&P Global, Inc.                                  | CUSIP: 78409V104<br>LEI: Y6X4K52KMJMZE7I7MY94 | Long             | EC               | CORP              | US        |     68489 | NS      | $24162919.20  | 0.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Nasdaq, Inc.                                   | Nasdaq, Inc.                                      | CUSIP: 631103108<br>LEI: 549300L8X1Q78ERXFD06 | Long             | EC               | CORP              | US        |   4218615 | NS      | $288806382.90 | 2.17%             |  |  |  | No            |                  1 | On Loan: No      |
| Canadian Pacific Railway Ltd.                  | Canadian Pacific Railway Ltd.                     | CUSIP: 13645T100<br>LEI: N/A                  | Long             | EC               | CORP              | CA        |    290201 | NS      | $23770363.91  | 0.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Littelfuse, Inc.                               | Littelfuse, Inc.                                  | CUSIP: 537008104<br>LEI: 549300MY7HLQFYTPCX75 | Long             | EC               | CORP              | US        |    450137 | NS      | $110958770.50 | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| Five Below, Inc.                               | Five Below, Inc.                                  | CUSIP: 33829M101<br>LEI: 529900AAXP5Z6BGI7418 | Long             | EC               | CORP              | US        |    650502 | NS      | $104639751.72 | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| IDEX Corp.                                     | IDEX Corp.                                        | CUSIP: 45167R104<br>LEI: 549300U5Y5EL6PHYLF13 | Long             | EC               | CORP              | US        |   1004464 | NS      | $238550155.36 | 1.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Alnylam Pharmaceuticals, Inc.                  | Alnylam Pharmaceuticals, Inc.                     | CUSIP: 02043Q107<br>LEI: 529900S3ZI14OWRJII50 | Long             | EC               | CORP              | US        |    479211 | NS      | $105709154.49 | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Ascendis Pharma A/S                            | Ascendis Pharma A/S                               | CUSIP: 04351P101<br>LEI: 549300B66JN3W3J8GH73 | Long             | EC               | CORP              | DK        |   1092061 | NS      | $134389026.66 | 1.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Ulta Beauty, Inc.                              | Ulta Beauty, Inc.                                 | CUSIP: 90384S303<br>LEI: 529900CIV6HN8M28YM82 | Long             | EC               | CORP              | US        |    508760 | NS      | $236491998.40 | 1.78%             |  |  |  | No            |                  1 | On Loan: No      |
| Arthur J Gallagher & Co.                       | Arthur J Gallagher & Co.                          | CUSIP: 363576109<br>LEI: 54930049QLLMPART6V29 | Long             | EC               | CORP              | US        |   2049390 | NS      | $408054042.90 | 3.06%             |  |  |  | No            |                  1 | On Loan: No      |
| Ball Corp.                                     | Ball Corp.                                        | CUSIP: 058498106<br>LEI: 0BGI85ALH27ZJP15DY16 | Long             | EC               | CORP              | US        |    942233 | NS      | $52840426.64  | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Thoughtworks Holding, Inc.                     | Thoughtworks Holding, Inc.                        | CUSIP: 88546E105<br>LEI: 984500E705D15F2DF680 | Long             | EC               | CORP              | US        |   1629960 | NS      | $14865235.20  | 0.11%             |  |  |  | No            |                  1 | On Loan: No      |
| Take-Two Interactive Software, Inc.            | Take-Two Interactive Software, Inc.               | CUSIP: 874054109<br>LEI: BOMSTHHJK882EWYX3334 | Long             | EC               | CORP              | US        |   1532032 | NS      | $161920462.08 | 1.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Henry Schein, Inc.                             | Henry Schein, Inc.                                | CUSIP: 806407102<br>LEI: VGO3WGL8H45T73F4RR92 | Long             | EC               | CORP              | US        |   1489916 | NS      | $120564002.72 | 0.91%             |  |  |  | No            |                  1 | On Loan: No      |
| Verisk Analytics, Inc.                         | Verisk Analytics, Inc.                            | CUSIP: 92345Y106<br>LEI: 549300I1YSWNIRKBWP67 | Long             | EC               | CORP              | US        |   1648092 | NS      | $302770981.32 | 2.27%             |  |  |  | No            |                  1 | On Loan: No      |
| IDEXX Laboratories, Inc.                       | IDEXX Laboratories, Inc.                          | CUSIP: 45168D104<br>LEI: OGMTXK0LUU1HKV2P0J84 | Long             | EC               | CORP              | US        |    243989 | NS      | $103907595.43 | 0.78%             |  |  |  | No            |                  1 | On Loan: No      |
| Maravai LifeSciences Holdings, Inc.            | Maravai LifeSciences Holdings, Inc., Class A      | CUSIP: 56600D107<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   3239032 | NS      | $48196796.16  | 0.36%             |  |  |  | No            |                  1 | On Loan: No      |
| West Pharmaceutical Services, Inc.             | West Pharmaceutical Services, Inc.                | CUSIP: 955306105<br>LEI: 5493007NKRGM1RJQ1P16 | Long             | EC               | CORP              | US        |    187836 | NS      | $44077595.76  | 0.33%             |  |  |  | No            |                  1 | On Loan: No      |
| ServiceNow, Inc.                               | ServiceNow, Inc.                                  | CUSIP: 81762P102<br>LEI: 549300HJTQM36M0E1G39 | Long             | EC               | CORP              | US        |    335597 | NS      | $139709031.10 | 1.05%             |  |  |  | No            |                  1 | On Loan: No      |
| Agilent Technologies, Inc.                     | Agilent Technologies, Inc.                        | CUSIP: 00846U101<br>LEI: QUIX8Y7A2WP0XRMW7G29 | Long             | EC               | CORP              | US        |   1713918 | NS      | $265623011.64 | 1.99%             |  |  |  | No            |                  1 | On Loan: No      |
| Domino's Pizza, Inc.                           | Domino's Pizza, Inc.                              | CUSIP: 25754A201<br>LEI: 25490005ZWM1IF9UXU57 | Long             | EC               | CORP              | US        |    265754 | NS      | $103306552.42 | 0.78%             |  |  |  | No            |                  1 | On Loan: No      |
| Black Knight, Inc.                             | Black Knight, Inc.                                | CUSIP: 09215C105<br>LEI: 549300TUSNXS3BFFML48 | Long             | EC               | CORP              | US        |   2751842 | NS      | $170586685.58 | 1.28%             |  |  |  | No            |                  1 | On Loan: No      |
| AZEK Co., Inc. (The)                           | AZEK Co., Inc. (The)                              | CUSIP: 05478C105<br>LEI: 5493002LDDDU1RX46815 | Long             | EC               | CORP              | US        |   3131534 | NS      | $60563867.56  | 0.45%             |  |  |  | No            |                  1 | On Loan: No      |
| FactSet Research Systems, Inc.                 | FactSet Research Systems, Inc.                    | CUSIP: 303075105<br>LEI: 549300ZSJE7NBK6K9P30 | Long             | EC               | CORP              | US        |    235580 | NS      | $108670698.20 | 0.82%             |  |  |  | No            |                  1 | On Loan: No      |
| TransUnion                                     | TransUnion                                        | CUSIP: 89400J107<br>LEI: 549300ZS772LUNUMRB03 | Long             | EC               | CORP              | US        |   1596657 | NS      | $100717123.56 | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Waste Connections, Inc.                        | Waste Connections, Inc.                           | CUSIP: 94106B101<br>LEI: 549300HDLRTPBQU69P29 | Long             | EC               | CORP              | CA        |   1613811 | NS      | $233195689.50 | 1.75%             |  |  |  | No            |                  1 | On Loan: No      |
| STERIS plc                                     | STERIS plc                                        | CUSIP: N/A<br>LEI: N/A                        | Long             | EC               | CORP              | IE        |   1535705 | NS      | $285241846.70 | 2.14%             |  |  |  | No            |                  1 | On Loan: No      |
| Dun & Bradstreet Holdings, Inc.                | Dun & Bradstreet Holdings, Inc.                   | CUSIP: 26484T106<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   7509809 | NS      | $101082029.14 | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Tractor Supply Co.                             | Tractor Supply Co.                                | CUSIP: 892356106<br>LEI: 549300OJ9VZHZRO6I137 | Long             | EC               | CORP              | US        |    735632 | NS      | $166480877.92 | 1.25%             |  |  |  | No            |                  1 | On Loan: No      |
| Tyler Technologies, Inc.                       | Tyler Technologies, Inc.                          | CUSIP: 902252105<br>LEI: 25490040SMU4Z8LBCW70 | Long             | EC               | CORP              | US        |    486338 | NS      | $166687486.12 | 1.25%             |  |  |  | No            |                  1 | On Loan: No      |
| Copart, Inc.                                   | Copart, Inc.                                      | CUSIP: 217204106<br>LEI: 549300KVYX3JWMYEHU61 | Long             | EC               | CORP              | US        |   2925176 | NS      | $194699714.56 | 1.46%             |  |  |  | No            |                  1 | On Loan: No      |
| Bumble, Inc.                                   | Bumble, Inc., Class A                             | CUSIP: 12047B105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1516621 | NS      | $36944887.56  | 0.28%             |  |  |  | No            |                  1 | On Loan: No      |
| Guardant Health, Inc.                          | Guardant Health, Inc.                             | CUSIP: 40131M109<br>LEI: 254900M8C3E5VC8BR186 | Long             | EC               | CORP              | US        |    456108 | NS      | $23872692.72  | 0.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Synopsys, Inc.                                 | Synopsys, Inc.                                    | CUSIP: 871607107<br>LEI: QG7T915N9S0NY5UKNE63 | Long             | EC               | CORP              | US        |    641048 | NS      | $217661437.92 | 1.63%             |  |  |  | No            |                  1 | On Loan: No      |
| O'Reilly Automotive, Inc.                      | O'Reilly Automotive, Inc.                         | CUSIP: 67103H107<br>LEI: 549300K2RLMQL149Q332 | Long             | EC               | CORP              | US        |    350661 | NS      | $303160460.94 | 2.28%             |  |  |  | No            |                  1 | On Loan: No      |
| Constellation Software, Inc.                   | Constellation Software, Inc.                      | CUSIP: 21037X100<br>LEI: 549300B6PYHMCTDWQV29 | Long             | EC               | CORP              | CA        |    119671 | NS      | $192921946.94 | 1.45%             |  |  |  | No            |                  1 | On Loan: No      |
| Hyatt Hotels Corp.                             | Hyatt Hotels Corp., Class A                       | CUSIP: 448579102<br>LEI: T27JQIMTYSH41TCD5186 | Long             | EC               | CORP              | US        |   1560883 | NS      | $156587782.56 | 1.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Electronic Arts, Inc.                          | Electronic Arts, Inc.                             | CUSIP: 285512109<br>LEI: 549300O7A67PUEYKDL45 | Long             | EC               | CORP              | US        |    457479 | NS      | $59829103.62  | 0.45%             |  |  |  | No            |                  1 | On Loan: No      |
| Burlington Stores, Inc.                        | Burlington Stores, Inc.                           | CUSIP: 122017106<br>LEI: 5299003Z37DVGKKC1W09 | Long             | EC               | CORP              | US        |    383595 | NS      | $75061869.60  | 0.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Clarivate plc                                  | Clarivate plc                                     | CUSIP: N/A<br>LEI: 549300WDHIIODXFO0R55       | Long             | EC               | CORP              | JE        |   4901118 | NS      | $47981945.22  | 0.36%             |  |  |  | No            |                  1 | On Loan: No      |
| Extra Space Storage, Inc.                      | Extra Space Storage, Inc.                         | CUSIP: 30225T102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1358488 | NS      | $218295436.72 | 1.64%             |  |  |  | No            |                  1 | On Loan: No      |
| Align Technology, Inc.                         | Align Technology, Inc.                            | CUSIP: 016255101<br>LEI: 549300N5YSE0U3LCP840 | Long             | EC               | CORP              | US        |    251257 | NS      | $49412201.62  | 0.37%             |  |  |  | No            |                  1 | On Loan: No      |
| CCC Intelligent Solutions Holdings, Inc.       | CCC Intelligent Solutions Holdings, Inc.          | CUSIP: 12510Q100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   3130275 | NS      | $28798530.00  | 0.22%             |  |  |  | No            |                  1 | On Loan: —       |
| Envista Holdings Corp.                         | Envista Holdings Corp.                            | CUSIP: 29415F104<br>LEI: 549300BX623VURJZ5269 | Long             | EC               | CORP              | US        |   5297095 | NS      | $180736881.40 | 1.36%             |  |  |  | No            |                  1 | On Loan: No      |
| Monolithic Power Systems, Inc.                 | Monolithic Power Systems, Inc.                    | CUSIP: 609839105<br>LEI: 529900TB7O85LSZ1XU31 | Long             | EC               | CORP              | US        |    832047 | NS      | $317808672.12 | 2.39%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2022-12-30

**Name of Applicant:** MFS Series Trust IV

**Signature:** Kasey Phillips

**Name of Signer:** Kasey Phillips

**Title:** Assistant Treasurer