# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0000912938-23-000310
**Filing Date:** 2023-3
**Character Count:** 3629
**Document Hash:** b6314788a2e776a75c31fcd517ef9a9a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-23-000310.hdr.sgml**: 20230330

**ACCESSION NUMBER**: 0000912938-23-000310

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20230330

**DATE AS OF CHANGE**: 20230330

**EFFECTIVENESS DATE**: 20230330

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-54607
- **FILM NUMBER:** 23777338

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

---

## 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           |

![](image0.jpg)

SUPPLEMENT TO THE PROSPECTUS

*Supplement dated March 30, 2023, to the Prospectus dated December 29, 2022.*

MFS<sup>®</sup> Mid Cap Growth Fund

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**Effective April 3, 2023, the section entitled "Portfolio Manager(s)" under the main heading entitled "Summary of Key Information" is restated in its entirety as follows:**

#### Portfolio Manager(s)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp; **Portfolio Manager** | &nbsp;&nbsp; **Since** | &nbsp;&nbsp; **Title** |
| &nbsp;&nbsp; Eric Braz | &nbsp;&nbsp; 2021 | &nbsp;&nbsp; Investment Officer of MFS |
| &nbsp;&nbsp; Eric Fischman | &nbsp;&nbsp; 2008 | &nbsp;&nbsp; Investment Officer of MFS |

---

**Effective April 3, 2023, the table in the section entitled "Portfolio Manager(s)" under the main heading entitled "Management of the Fund" is restated as follows:**

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp; **Portfolio Manager** | &nbsp;&nbsp; **Primary Role** | **Five Year History** |
| &nbsp;&nbsp; Eric Braz | &nbsp;&nbsp; Portfolio Manager | Employed in the investment area of MFS since 2007 |
| &nbsp;&nbsp; Eric Fischman | &nbsp;&nbsp; Portfolio Manager | Employed in the investment area of MFS since 2000 |

---

1050634 1 &nbsp;&nbsp;&nbsp;&nbsp; OTC-SUP-I-033023

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