# EDGAR Filing Document

**Accession Number:** 0000924727
**File Stem:** 0001213900-25-126508
**Filing Date:** 2025-12
**Character Count:** 2986
**Document Hash:** 5e144e92914fe6dcab019c1b130ae2ef
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-126508.hdr.sgml**: 20251230

**ACCESSION NUMBER**: 0001213900-25-126508

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251230

**DATE AS OF CHANGE**: 20251230

**EFFECTIVENESS DATE**: 20251230

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Investment Managers Series Trust III
- **CENTRAL INDEX KEY:** 0000924727

**ORGANIZATION NAME:**
- **EIN:** 043236699
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-79858
- **FILM NUMBER:** 251613643

**BUSINESS ADDRESS:**
- **STREET 1:** 235 W. GALENA STREET
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53212
- **BUSINESS PHONE:** 626-385-5777

**MAIL ADDRESS:**
- **STREET 1:** 235 W. GALENA STREET
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53212

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FPA FUNDS TRUST
- **DATE OF NAME CHANGE:** 20021028

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** UAM FUNDS TRUST
- **DATE OF NAME CHANGE:** 19951101

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** REGIS FUND II
- **DATE OF NAME CHANGE:** 19940606

## Series and Classes Contracts Data

### MANTEIO MANAGED FUTURES STRATEGY FUND (Series ID: S000088666)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000255003 | Class I Shares | CSAIX           |
| C000255004 | Class C Shares | CSACX           |
| C000255005 | Class A Shares | CSAAX           |

**Manteio Managed Futures Strategy Fund**

**Class A Shares (CSAAX)**

**Class C Shares (CSACX)**

**Class I Shares (CSAIX)**

**Manteio Multialternative Strategy Fund**

**Class A Shares (CSQAX)**

**Class I Shares (CSQIX)**

***A series of Investment Managers Series Trust III (the "Trust")***

 

**Supplement dated December 30, 2025, to the currently effective** 

**Prospectus, Summary Prospectuses and Statement of Additional Information ("SAI")**

***<u>Important Notice Regarding Changes to Fund Names</u>***

Based upon the recommendation of Manteio Scalable Technologies LLC (which uses the trade name Mast Investments), the investment advisor to the Manteio Managed Futures Strategy Fund and the Manteio Multialternative Strategy Fund (the "Funds"), the Board of Trustees of the Trust has approved the changes to the Funds' names as noted in the table below, effective immediately. As a result, effective immediately, all references to the Funds' names in the Prospectus, respective Summary Prospectus and SAI will be updated accordingly. There will be no change to the Funds' principal investment strategies as a result of the name changes.

---

| | |
|:---|:---|
| **Current Fund Name** | **New Fund Name** |
| Manteio Managed Futures Strategy Fund | Mast Managed Futures Strategy Fund |
| Manteio Multialternative Strategy Fund | Mast Multialternative Strategy Fund |

---

 ****

***Please file this Supplement with your records****.*