# EDGAR Filing Document

**Accession Number:** 0001806095
**File Stem:** 0001193125-25-186468
**Filing Date:** 2025-8
**Character Count:** 5363
**Document Hash:** 971c093de7b00bfc7a43918c43720365
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-186468.hdr.sgml**: 20250822

**ACCESSION NUMBER**: 0001193125-25-186468

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250822

**DATE AS OF CHANGE**: 20250822

**EFFECTIVENESS DATE**: 20250822

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Datum One Series Trust
- **CENTRAL INDEX KEY:** 0001806095

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-237048
- **FILM NUMBER:** 251246924

**BUSINESS ADDRESS:**
- **STREET 1:** 333 SOUTH WABASH AVE.
- **STREET 2:** 43RD FLOOR
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60604
- **BUSINESS PHONE:** 866-494-4270

**MAIL ADDRESS:**
- **STREET 1:** 50 S. LASALLE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60603

## Series and Classes Contracts Data

### Stewart Investors Worldwide Leaders Fund (Series ID: S000089901)

---

|  |  |
|:---|:---|
| Class Name      | Class ID   |
| Select Shares   | C000256744 |
| Investor Shares | C000263018 |

---

### Stewart Investors Global Emerging Markets Leaders Fund (Series ID: S000089902)

---

|  |  |
|:---|:---|
| Class Name      | Class ID   |
| Select Shares   | C000256745 |
| Investor Shares | C000263019 |

---

## Series and Classes Contracts Data

### Stewart Investors Worldwide Leaders Fund (Series ID: S000089901)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000256744 | Select Shares   |  |
| C000263018 | Investor Shares |  |

### Stewart Investors Global Emerging Markets Leaders Fund (Series ID: S000089902)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000256745 | Select Shares   |  |
| C000263019 | Investor Shares |  |

Filed pursuant to Rule 497(e)

under the Securities Act of 1933, as amended

Registration File No.: 333-237048

**STEWART INVESTORS WORLDWIDE LEADERS FUND** 

**STEWARD INVESTORS GLOBAL EMERGING MARKETS LEADERS FUND** 

**(each a "Fund", together the "Funds")** 

**A SERIES OF DATUM ONE SERIES TRUST** 

**Supplement dated August 22, 2025** 

**to the Prospectus and Statement of Additional Information dated July 29, 2025** 

Effective immediately, Sashi Reddy is no longer a portfolio manager of the Stewart Investors Worldwide Leaders Fund and will be replaced by Nick Edgerton. The following changes are being made to the Prospectus and Statement of Additional Information ("SAI") of the Funds to reflect the replacement of Mr. Reddy and appointment of Mr. Edgerton as portfolio manager of the Fund:

<u>In the Prospectus, within the Fund Summary relating to the</u> <u>Stewart Investors Worldwide Leaders Fund</u><u>, the subsection</u> <u>"</u><u>Management of the Fund – Portfolio Manager</u><u>"</u> <u>is deleted in its entirety and replaced with the following:</u>

**Portfolio Manager** 

**Nick Edgerton** 

Lead Portfolio Manager

Length of Service: Since August 2025

<u>In the Prospectus, within the Management of the Funds section, the "Portfolio Managers – Stewart Investors Worldwide Leaders Fund" subsection is deleted in its entirety and replaced with the following:</u>

***Stewart Investors Worldwide Leaders Fund***

**Nick Edgerton—Lead Portfolio Manager.** Nick is a Senior Portfolio Manager at Stewart Investors and sits on the Stewart Investors Board. He joined the team in April 2012. Nick is lead manager of the Worldwide All Cap and Worldwide Leaders strategies. Nick has a Bachelor of Economics from Macquarie University, and a Master of Science with Distinction in Ecological Economics from the University of Edinburgh.

<u>In the SAI, within the Portfolio Manager section, the "Other Accounts Managed – Stewart Investors Worldwide Leaders Fund" subsection is deleted in its entirety and replaced with the following:</u>

***Stewart Investors Worldwide Leaders Fund***

**Nick Edgerton\*** 

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **Number of Accounts**  | **Number of Accounts**  | **Assets Under Management**  | **Assets Under Management**  |
| <br>**Account Type** | **Total**  | **Subject to a<br>Performance<br>Fee**  | **Total**  | **Subject to a<br>Performance<br>Fee**  |
|  Registered Investment Companies | 0 | 0 | $0 | $0 |
|  Other Pooled Investment Vehicles | 3 | 0 | $751393010 | $0 |
|  Other Accounts | 1 | 0 | $114447681 | $0 |

---

\*Other Accounts Managed information provided as of June 30, 2025.

------

<u>In the SAI, within the Portfolio Manager section, the "Ownership of Securities" subsection is deleted in its entirety and replaced with the following:</u>

**Ownership of Securities–**The following table indicates for each Fund the dollar range of shares beneficially owned by the Funds' portfolio managers as of July 1, 2025.

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**<u>Fund and Portfolio Manager</u>** | **<u>Investment Range</u>** |
| &nbsp;&nbsp;&nbsp; ***Stewart Investors Worldwide Leaders Fund*** | |
| &nbsp;&nbsp;&nbsp; Nick Edgerton\* |  |
| &nbsp;&nbsp;&nbsp; ***Stewart Investors Global Emerging Markets Leaders Fund*** |  |
| &nbsp;&nbsp;&nbsp; Jack Nelson |  |
| \*Ownership information provided as of June 30, 2025. |  |

---

**This Supplement and the Prospectus and SAI should be retained for future reference.**