# EDGAR Filing Document

**Accession Number:** 0000924727
**File Stem:** 0001213900-25-056737
**Filing Date:** 2025-6
**Character Count:** 4978
**Document Hash:** 6ef69ef480bd4a5ebc1ee4116f35fb66
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-056737.hdr.sgml**: 20250623

**ACCESSION NUMBER**: 0001213900-25-056737

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250623

**DATE AS OF CHANGE**: 20250623

**EFFECTIVENESS DATE**: 20250623

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-79858
- **FILM NUMBER:** 251065460

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

---

### MANTEIO MULTIALTERNATIVE STRATEGY FUND (Series ID: S000088667)

---

|  |  |  |
|:---|:---|:---|
| Class Name     | Ticker Symbol | Class ID   |
| Class I Shares | CSQIX         | C000255006 |
| Class A Shares | CSQAX         | C000255007 |

---

## 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 MULTIALTERNATIVE STRATEGY FUND (Series ID: S000088667)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000255006 | Class I Shares | CSQIX           |
| C000255007 | Class A Shares | CSQAX           |

**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)

 

*Each a series (together, the "Funds") of Investment Managers Series Trust III*

**Supplement dated June 23, 2025, to the**

**Prospectus and Statement of Additional Information ("SAI")** 

**dated February 28, 2025, as supplemented.**

*Effective immediately, the third paragraph under "Management of the Funds – Investment Advisor" in the Prospectus and under "Fund Expenses" in the SAI is deleted in its entirety and replaced with the following:*

In addition, the Advisor has agreed to voluntarily waive its advisory fees for the Manteio Multialternative Strategy Fund by 0.19% to 0.85% until November 22, 2026. The Advisor will not seek recoupment of the voluntary advisory fees waived.

*Additionally, effective immediately, the second and third paragraphs of the "Trustee Compensation" section in the SAI for the Funds are deleted in their entirety and replaced with the following disclosure:*

Effective January 1, 2025, each Independent Trustee receives a fixed annual retainer of $177,500, payable in equal quarterly increments; $6,000 for each special in-person meeting attended; and $2,500 for each other special meeting attended by videoconference or teleconference at which Board action is taken and/or materials were prepared for review. In addition, Mr. Zader receives an additional annual retainer of $40,000 for serving as Chair of the Board; Ms. Brown receives an additional annual retainer of $20,000 for serving as Chair of the Audit Committee; and Mr. Goldrich receives an additional annual retainer of $20,000 for serving as Chair of the Nominating, Governance and Regulatory Review Committee (the "Nominating Committee").

Effective January 1, 2026, each Independent Trustee will receive a fixed annual retainer of $195,000, payable in equal quarterly increments; $6,000 for each special in-person meeting attended; and $2,500 for each other special meeting attended by videoconference or teleconference at which Board action is taken and/or materials were prepared for review. In addition, Mr. Zader will receive an additional annual retainer of $50,000 for serving as Chair of the Board; Ms. Brown will receive an additional annual retainer of $20,000 for serving as Chair of the Audit Committee; and Mr. Goldrich will receive an additional annual retainer of $20,000 for serving as Chair of the Nominating Committee.

 ****

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