# MFS Mid Cap Growth Fund — new fund registration

MFS SERIES TRUST IV registered fund series on Form 485APOS, filed 2025-10-08. Featured series: MFS Mid Cap Growth Fund.

## Registration

- Registrant / trust: MFS SERIES TRUST IV
- CIK: 0000063068
- Form: 485APOS
- Filed: 2025-10-08
- State of incorporation: MA
- Accession: 0000912938-25-000191
- Reported net assets: $13.8B

## Series & classes (9)

| Series | Class | Ticker | New |
| --- | --- | --- | --- |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | A | OTCAX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | R4 | OTCJX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | B | OTCBX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | C | OTCCX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | I | OTCIX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | R1 | OTCGX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | R2 | MCPRX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | R3 | OTCHX | — |
| [MFS Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000002434) | R6 | OTCKX | — |

## Fees (from the effective prospectus)

- 12b-1 fee: 0.25%
- Gross expense ratio: 1.03%
- Management fee: 0.64%
- Net expense ratio: 1.02%
- Other expenses: 0.14%

## Investment objective

The funds investment objective is to seek capital appreciation.

## Advisers

- [Massachusetts Financial Services Company (Advisor)](https://search.stillhousedata.com/firm/110045)

## Other filings by this registrant (8)

- [485APOS — 2016-10-27](https://search.stillhousedata.com/launch/0001104659-16-152435)
- [485APOS — 2015-10-29](https://search.stillhousedata.com/launch/0001104659-15-073922)
- [485APOS — 2015-06-29 (27 new series)](https://search.stillhousedata.com/launch/0001104659-15-048286)
- [485APOS — 2014-10-29](https://search.stillhousedata.com/launch/0001104659-14-074631)
- [485APOS — 2011-09-30 (8 new series)](https://search.stillhousedata.com/launch/0001104659-11-054163)
- [485APOS — 2009-10-13](https://search.stillhousedata.com/launch/0001193125-09-206870)
- [485APOS — 2007-03-30](https://search.stillhousedata.com/launch/0001047469-07-002353)
- [485APOS — 2006-10-27](https://search.stillhousedata.com/launch/0001047469-06-013200)

## More

- [Registrant profile: MFS SERIES TRUST IV](https://search.stillhousedata.com/registrant/63068)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/launch/0000912938-25-000191.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.