# EDGAR Filing Document

**Accession Number:** 0001065698
**File Stem:** 0000912938-26-000410
**Filing Date:** 2026-4
**Character Count:** 4141
**Document Hash:** 801daa443bc37fd73036816ef5e93bba
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-26-000410.hdr.sgml**: 20260420

**ACCESSION NUMBER**: 0000912938-26-000410

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260420

**DATE AS OF CHANGE**: 20260420

**EFFECTIVENESS DATE**: 20260420

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS VARIABLE INSURANCE TRUST III
- **CENTRAL INDEX KEY:** 0001065698

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-59093
- **FILM NUMBER:** 26874205

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SUN CAPITAL ADVISERS TRUST
- **DATE OF NAME CHANGE:** 19980709

## Series and Classes Contracts Data

### MFS Blended Research Small Cap Equity Portfolio (Series ID: S000008071)

---

|  |  |
|:---|:---|
| Class Name    | Class ID   |
| Initial Class | C000021905 |
| Service Class | C000021906 |

---

## Series and Classes Contracts Data

### MFS Blended Research Small Cap Equity Portfolio (Series ID: S000008071)

| Class ID   | Class Name    | Ticker Symbol   |
|:---|:---|:---|
| C000021905 | Initial Class |  |
| C000021906 | Service Class |  |

![](img_e76b7f70a8d94f1.jpg)

SUPPLEMENT TO THE PROSPECTUS

*Supplement dated April 20, 2026, to the Prospectus dated April 30, 2025.*

## MFS <sup>®</sup> Blended Research <sup>®</sup> Small Cap Equity Portfolio

#### Effective immediately, the sub-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;&nbsp;**Since** | &nbsp;&nbsp;&nbsp;**Title** |
| &nbsp;&nbsp;Matt Krummell | &nbsp;&nbsp;&nbsp;2012 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |
| &nbsp;&nbsp;Nathan Bryant | &nbsp;&nbsp;&nbsp;January 2026 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |
| &nbsp;&nbsp;Jonathan Sage | &nbsp;&nbsp;&nbsp;2015 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |
| &nbsp;&nbsp;Jed Stocks | &nbsp;&nbsp;&nbsp;2015 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |
| &nbsp;&nbsp;Jenney Zhang | &nbsp;&nbsp;&nbsp;January 2026 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |

---

Matt Krummell has announced his intention to retire effective April 7, 2027, and he will no longer be a portfolio manager of the fund as of that date.

#### Effective immediately, the sub-section entitled "Portfolio Manager(s)" under the main heading entitled "Management of the Fund" is restated in its entirety as follows:

#### Portfolio Manager(s)
Information regarding the portfolio manager(s) of the fund is set forth below. Further information regarding the portfolio manager(s), including other accounts managed, compensation, ownership of fund shares, and possible conflicts of interest, is available in the fund's SAI.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;**Portfolio Manager** | &nbsp;&nbsp;&nbsp;**Primary Role** | &nbsp;&nbsp;&nbsp;**Five Year History** |
| &nbsp;&nbsp;Matt Krummell | &nbsp;&nbsp;Lead Portfolio Manager | &nbsp;&nbsp;Employed in the investment area of MFS since 2001 |
| &nbsp;&nbsp;Nathan Bryant | &nbsp;&nbsp;Portfolio Manager | &nbsp;&nbsp;Employed in the investment area of MFS since 2015 |
| &nbsp;&nbsp;Jonathan Sage | &nbsp;&nbsp;Portfolio Manager | &nbsp;&nbsp;Employed in the investment area of MFS since 2000 |
| &nbsp;&nbsp;Jed Stocks | &nbsp;&nbsp;Portfolio Manager | &nbsp;&nbsp;Employed in the investment area of MFS since 2001 |
| &nbsp;&nbsp;Jenney Zhang | &nbsp;&nbsp;Portfolio Manager | &nbsp;&nbsp;Employed in the investment area of MFS since 2011 |

---

Matt Krummell has announced his intention to retire effective April 7, 2027, and he will no longer be a portfolio manager of the fund as of that date.

VSC-SUP-I-042026

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