# EDGAR Filing Document

**Accession Number:** 0001806095
**File Stem:** 0001398344-26-000223
**Filing Date:** 2026-1
**Character Count:** 43989
**Document Hash:** 0eed072cffcbf5577ede1a518ed3dd9c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-26-000223.hdr.sgml**: 20260106

**ACCESSION NUMBER**: 0001398344-26-000223

**CONFORMED SUBMISSION TYPE**: POS EX

**PUBLIC DOCUMENT COUNT**: 7

**FILED AS OF DATE**: 20260106

**DATE AS OF CHANGE**: 20260106

**EFFECTIVENESS DATE**: 20260106

**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:** POS EX
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-288636
- **FILM NUMBER:** 26510907

**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

**As filed with the Securities and Exchange Commission on January 6, 2026**

**Securities Act File No. 333-288636**

**U.S. SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM N-14**

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| | |
|:---|:---|
| **Registration Statement** |  |
| ***Under*** |  |
| ***The Securities Act Of 1933*** | [X] |
| **Pre-Effective Amendment No.** | [ ] |
| **Post-Effective Amendment No. 2** | [X] |

---

**DATUM ONE SERIES TRUST**

**(Exact Name of Registrant Specified in Charter)**

**50 S. LaSalle Street**

**Chicago, IL 60603**

**(Address of Principal Executive Offices) (Zip Code)**

**(866) 494-4270**

**(Registrant's Area Code and Telephone Number)**

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| | |
|:---|:---|
| **Name and Address of Agent for Service of Process** | **With copies to:** |
| **Barbara J. Nelligan<br> The Northern Trust Company <br> 50 S. LaSalle Street<br> Chicago, Illinois 60603** | **Jessica Reece**<br> **Ropes & Gray LLP**<br> **Prudential Tower**<br> **800 Boylston Street**<br> **Boston, Massachusetts 02199** |

---

It is proposed that this filing will become effective immediately.

This Post-Effective Amendment No. 2 to the Datum One Series Trust® (the "Trust") Registration Statement on Form N-14 hereby incorporates [Part A and Part B to the Registration Statements on Form N-14 filed pursuant to Rule 485(b) on August 20, 2025](https://www.sec.gov/Archives/edgar/data/1806095/000119312525184025/d64295d485bpos.htm). This Post-Effective Amendment No. 2 is being filed for the purpose of adding the final tax opinions as exhibits to Part C of the Registration Statement.

**PART C** 

**Item 15. Indemnification.** 

Reference is made to Article VIII of the Registrant's Agreement and Declaration of Trust. The application of these provisions is limited by the following undertaking set forth in the rules promulgated by the Securities and Exchange Commission:

Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to trustees, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in such Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a trustee, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such trustee, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in such Act and will be governed by the final adjudication of such issue. The Registrant may maintain a standard mutual fund and investment advisory professional and directors and officers' liability policy. The policy, if maintained, would provide coverage to the Registrant, its Trustees and officers, and could cover its advisers, among others. Coverage under the policy would include losses by reason of any act, error, omission, misstatement, misleading statement, neglect or breach of duty.

**Item 16. Exhibits.** 

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| | |
|:---|:---|
| (1)(a) | [Agreement and Declaration of Trust dated February 28, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated March 10, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520068637/d895705dex99ai.htm) |
| (1)(b) | [Amended and Restated Agreement and Declaration of Trust dated March 3, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated March 10, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520068637/d895705dex99aii.htm) |
| (1)(c) | [First Amendment to the Amended and Restated Agreement and Declaration of Trust dated December 5, 2023 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 9 dated February 15, 2024.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524037741/d755860dex99aiii.htm) |
| (1)(d) | [Second Amendment to the Amended and Restated Agreement and Declaration of Trust dated December 5, 2023 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 10 dated March 15, 2024.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524069239/d758467dex99aiii.htm) |
| (1)(e) | [Third Amendment to the Amended and Restated Agreement and Declaration of Trust dated December 5, 2023 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 17dated November 13, 2024.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524256754/d881038dex99av.htm) |
| (1)(f) | [Fourth Amendment to the Amended and Restated Agreement and Declaration of Trust dated December 5, 2023 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 20 dated May 29, 2025.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525130410/d948358dex99avi.htm) |
| (2) | [By-Laws dated February 28, 2020 which were filed as an Exhibit to the Registrant's Form N-1A dated May 13, 2022 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312522149809/d719315dex99bi.htm) |
| (3) | Not Applicable |
| (4) | Form of Agreement and Plan of Reorganization is included as Appendix A to Part A hereof. |
| (5) | Article III (Shares) and Article V (Shareholders' Voting Powers and Meetings) of the Amended and Restated Agreement and Declaration of Trust |
| (6)(a) | [Amended & Restated Investment Management Agreement between the Registrant and First Sentier Investors (US) LLC, on behalf of the Funds advised by First Sentier Investors (US) LLC, dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 21 dated June 6, 2025.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99dvii.htm) |
| (6)(b) | [Investment Sub-Advisory Agreement between First Sentier Investors (US) LLC and First Sentier Investors (Australia) IM Ltd, on behalf of the Funds sub-advised by First Sentier Investors (Australia) IM Ltd, dated December 4, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99dvii.htm) |

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| | |
|:---|:---|
| (6)(c) | [Amended Schedule A and B to the Investment Sub-Advisory Agreement between First Sentier Investors (US) LLC and First Sentier Investors (Australia) IM Ltd, on behalf of the Funds sub-advised by First Sentier Investors (Australia) IM Ltd, dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post Effective Amendment No. 21 dated June 6, 2025.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99dix.htm) |
| (7)(a) | [Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated March 3, 2020 and Form of Dealer Agreement which was filed as an Exhibit to the Registrant's Form N-1A dated April 15, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000168386320003311/f3560d2.htm) |
| (7)(b) | [First Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated July 2, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated July 16, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520193853/d868540dex99eii.htm) |

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| | |
|:---|:---|
| (7)(c) | [Novation of Distribution Agreement between the Registrant and Foreside Financial Services, LLC was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 7 dated January 31, 2023 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312523020299/d437742dex99eiii.htm) |
| (7)(d) | [First Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated November 8, 2022 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 7 dated January 31, 2023 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312523020299/d437742dex99eiv.htm) |
| (7)(e) | [Second Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated April 8, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 11 dated May 1, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524125745/d805584dex99ev.htm) |
| (7)(f) | [Third Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated May 22, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 13 dated June 28, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524172081/d842870dex99evi.htm) |
| (7)(g) | [Fourth Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated December 4, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99evii.htm) |
| (7)(h) | [Fifth Amendment to the Distribution Agreement between the Registrant and Foreside Financial Services, LLC dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 21 dated June 6, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99eviii.htm) |
| (7)(i) | [Distribution Services Agreement between First Sentier Investors (US) LLC and Foreside Financial Services, LLC dated December 17, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99exi.htm) |
| (8) | Not applicable |
| (9)(a) | [Custody Agreement between the Registrant and The Northern Trust Company dated March 3, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated March 10, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520068637/d895705dex99gi.htm) |
| (9)(b) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated July 2, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated July 16, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520193853/d868540dex99gii.htm) |
| (9)(c) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated November 9, 2022 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 7 dated January 31, 2023 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312523020299/d437742dex99giii.htm) |
| (9)(d) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated March 8, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 10 dated March 15, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524069239/d758467dex99giv.htm) |
| (9)(e) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated June 14, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 13 dated June 28, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524172081/d842870dex99gv.htm) |
| (9)(f) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated December 5, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99gvi.htm) |
| (9)(g) | [Amendment to the Custody Agreement between the Registrant and The Northern Trust Company dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 21 dated June 6, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99gvii.htm) |
| (9)(h) | [Amended and Restated Custody Agreement between the Registrant and The Northern Trust Company dated October 1, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 26 dated November 3, 2025, is hereby incorporated by reference](https://www.sec.gov/Archives/edgar/data/1806095/000119312525262751/d93247dex99gviii.htm)<u>.</u> |
| (10)(a) | [Rule 12b-1 Plan adopted on December 5, 2023, which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 11 dated May 1, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/0001806095/000119312524125745/d805584dex99mi.htm) |
| (10)(b) | [Shareholder Services Plan adopted on December 5, 2023, which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 11 dated May 1, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/0001806095/000119312524125745/d805584dex99mii.htm) |
| (10)(c) | [Amended & Restated Exhibit A to the Shareholder Services Plan dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 20 dated May 29, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525130410/d948358dex99miii.htm) |
| (10)(b) | [Amended & Restated Multiple Class Plan Pursuant to Rule 18f-3 Plan adopted on May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 20 dated May 29, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525130410/d948358dex99ni.htm) |

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| | |
|:---|:---|
| (11) | [Opinion and Consent of Ropes & Gray LLP regarding the legality of the securities being registered, which was filed as an Exhibit to the Registrant's Registration Statement on Form N-14 dated July 11, 2025, is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525158166/d81395dex9911.htm) |
| (12)(a) | [Opinion of Ropes & Gray LLP with respect to tax matters in connection with the reorganization of the First Sentier American Listed Infrastructure Fund into the First Sentier American Listed Infrastructure Fund is filed herewith.](fp0096790-1_ex991612a.htm) |
| (12)(b) | [Opinion of Ropes & Gray LLP with respect to tax matters in connection with the reorganization of the First Sentier Global Listed Infrastructure Fund into the First Sentier Global Listed Infrastructure Fund is filed herewith.](fp0096790-1_ex991612b.htm) |
| (12)(c) | [Consent of Ropes & Gray LLP as to filing of tax opinions in connection with the reorganizations of the Funds is filed herewith.](fp0096790-1_ex991612c.htm) |
| (13)(a) | [Amended and Restated Transfer Agency and Service Agreement between the Registrant and The Northern Trust Company dated March 8, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 10 dated March 15, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524069239/d758467dex99hiv.htm) |
| (13)(b) | [Amendment to the Amended and Restated Transfer Agency and Service Agreement dated June 14, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 13 dated June 28, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524172081/d842870dex99hv.htm) |
| (13)(c) | [Amendment to the Amended and Restated Transfer Agency and Service Agreement between the Registrant and The Northern Trust Company dated December 5, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99hvi.htm) |
| (13)(d) | [Amendment to the Amended and Restated Transfer Agency and Service Agreement between the Registrant and The Northern Trust Company dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 21 dated June 6, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99hiv.htm) |
| (13)(e) | [Fund Officer Agreement between the Registrant and Foreside Fund Officer Services, LLC dated March 3, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated April 15, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000168386320003311/f3560d4.htm) |
| (13)(f) | [First Amendment to the Fund Officer Agreement between the Registrant and Foreside Fund Officer Services, LLC dated August 5, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 16 dated September 16, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524219244/d829133dex99hvii.htm) |
| (13)(g) | [Amended & Restated Expense Limitation Agreement between Registrant and First Sentier Investors (US) LLC, on behalf of the Funds advised by First Sentier Investors (US) LLC, dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No 21 dated June 6, 2025.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99hxi.htm) |
| (13)(h) | [Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated March 3, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated March 10, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520068637/d895705dex99hiv.htm) |
| (13)(i) | [First Amended Schedule D to the Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated July 2, 2020 which was filed as an Exhibit to the Registrant's Form N-1A dated July 16, 2020 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312520193853/d868540dex99hvii.htm) |
| (13)(j) | [Amendment to the Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated November 9, 2022 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 7 dated January 31, 2023 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312523020299/d437742dex99hxi.htm) |
| (13)(k) | [Amendment to the Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated March 8, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 10 dated March 15, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524069239/d758467dex99hxvi.htm) |
| (13)(l) | [Amendment to the Amended Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated June 14, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 13 dated June 28, 2024 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312524172081/d842870dex99hxvii.htm) |
| (13)(m) | [Amendment to the Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated December 5, 2024 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 18 dated January 27, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525013144/d892275dex99hxxi.htm) |
| (13)(n) | [Amendment to the Fund Administration and Accounting Services Agreement between the Registrant and The Northern Trust Company dated May 20, 2025 which was filed as an Exhibit to the Registrant's Form N-1A Post-Effective Amendment No. 21 dated June 6, 2025 is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525136372/d74101dex99hxviii.htm) |
| (14)(a) | [Consent of Independent Registered Public Accounting Firm which was filed as an Exhibit to Registrant's Registration Statement on Form N-14 dated August 20, 2025 is hereby incorporated by reference.](https://www.sec.gov/Archives/edgar/data/1806095/000119312525184025/d64295dex99i.htm) |
| (15) | Not applicable. |
| (16)(a) | [Power of Attorney for Ryan D. Burns with respect to the filings on Form N-14, which was filed as an Exhibit to the Registrant's Registration Statement on Form N-14 dated July 11, 2025, is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525158166/d81395dex9916a.htm) |

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| | |
|:---|:---|
| (16)(b) | [Power of Attorney for JoAnn S. Lilek with respect to the filings on Form N-14, which was filed as an Exhibit to the Registrant's Registration Statement on Form N-14 dated July 11, 2025, is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525158166/d81395dex9916b.htm) |
| (16)(c) | [Power of Attorney for Patricia A. Weiland with respect to the filings on Form N-14, which was filed as an Exhibit to the Registrant's Registration Statement on Form N-14 dated July 11, 2025, is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525158166/d81395dex9916c.htm) |
| (16)(d) | [Power of Attorney for Lloyd A. Wennlund with respect to the filings on Form N-14, which was filed as an Exhibit to the Registrant's Registration Statement on Form N-14 dated July 11, 2025, is hereby incorporated by reference.](http://www.sec.gov/Archives/edgar/data/1806095/000119312525158166/d81395dex9916d.htm) |
| (17) | Form of Proxy Card is included in Part A hereof. |

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**Item 17.** **Undertakings**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The undersigned Registrant agrees that, prior to any public reoffering
of the securities registered through the use of a prospectus which is a part of this registration statement by any person or party who
is deemed to be an underwriter within the meaning of Rule 145(c) under the Securities Act of 1933, as amended (the "1933 Act"),
the reoffering prospectus will contain the information called for by the applicable registration form for reofferings by persons who
may be deemed underwriters, in addition to the information called for by the other items of the applicable form.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) The undersigned Registrant agrees that every prospectus filed
under paragraph (1) above will be filed as a part of an amendment to this registration statement and will not be used until the
amendment is effective, and that, in determining any liability under the 1933 Act, each post-effective amendment shall be deemed to be
a new registration statement for the securities offered therein, and the offering of the securities at that time shall be deemed to be
the initial bona fide offering of them.

**NOTICE**

A copy of the Amended and Restated Agreement and Declaration of Trust of Datum One Series Trust is on file with the Secretary of The Commonwealth of Massachusetts and notice is hereby given that this instrument is executed on behalf of the Registrant by an officer of the Registrant as an officer and not individually and the obligations of or arising out of this instrument are not binding upon any of the Trustees, officers or shareholders individually but are binding only upon the assets and property of the relevant series of the Registrant.

**SIGNATURES**

As required by the Securities Act of 1933, as amended, this Registration Statement has been signed on behalf of the Registrant, in the City of Chicago in the State of Illinois on the 6th day of January, 2026.

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| | |
|:---|:---|
| Datum One Series Trust | Datum One Series Trust |
| By: | /s/ Barbara J. Nelligan |
|  | Barbara J. Nelligan, President |

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As required by the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the date indicated.

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| | | |
|:---|:---|:---|
| Signature | Title | Date |
| /s/ Barbara J. Nelligan | President (Principal Executive Officer) | January 6, 2026 |
| Barbara J. Nelligan |  |  |
| Ryan D. Burns | Trustee | January 6, 2026 |
| Ryan D. Burns\* |  |  |
| JoAnn S. Lilek | Trustee | January 6, 2026 |
| JoAnn S. Lilek\* |  |  |
| Patricia A. Weiland | Trustee | January 6, 2026 |
| Patricia A. Weiland\* |  |  |
| Lloyd A. Wennlund | Trustee | January 6, 2026 |
| Lloyd A. Wennlund\* |  |  |
| /s/ Tracy L. Dotolo | Treasurer (Principal Financial Officer) | January 6, 2026 |
| Tracy L. Dotolo |  |  |

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| | |
|:---|:---|
| By: | /s/ Barbara J. Nelligan |
|  | Barbara J. Nelligan, as Attorney-in-Fact |

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\* Pursuant to Power of Attorney

**Exhibit Index**

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| | |
|:---|:---|
| [(12)(a)](fp0096790-1_ex991612a.htm) | [Opinion of Ropes & Gray LLP with respect to tax matters in connection with the reorganization of the First Sentier American Listed Infrastructure Fund into the First Sentier American Listed Infrastructure Fund.](fp0096790-1_ex991612a.htm) |
| [(12)(b)](fp0096790-1_ex991612b.htm) | [Opinion of Ropes & Gray LLP with respect to tax matters in connection with the reorganization of the First Sentier Global Listed Infrastructure Fund into the First Sentier Global Listed Infrastructure Fund.](fp0096790-1_ex991612b.htm) |
| [(12)(c)](fp0096790-1_ex991612c.htm) | [Consent of Ropes & Gray LLP as to filing of tax opinions in connection with the reorganizations of the Funds.](fp0096790-1_ex991612c.htm) |

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## Exhibit 99.16

![](fp0096790-1_01.jpg)

November 3, 2025

First Sentier American Listed Infrastructure Fund

Advisors Series Trust

P.O. Box 701

Milwaukee, WI 53201

First Sentier American Listed Infrastructure Fund

Datum One Series Trust

333 S. Wabash Avenue

Chicago, IL 60604

Ladies and Gentlemen:

We have acted as counsel in connection with the Agreement and Plan of Reorganization (the "Agreement") dated October 27, 2025, by and among (i) Datum One Series Trust, a Massachusetts business trust ("Acquiring Trust"), on behalf of its series First Sentier American Listed Infrastructure Fund ("Acquiring Fund"), (ii) Advisors Series Trust, a Delaware statutory trust ("Acquired Trust"), on behalf of its series First Sentier American Listed Infrastructure Fund ("Acquired Fund"), and (iii) for purposes of Sections 4.3, 5.6, 5.8, 9.2, 10.2 and 11.3 only, First Sentier Investors (US) LLC ("FSI"). The Agreement describes a proposed transaction (the "Reorganization") to occur as of the date of this letter (the "Closing Date"), pursuant to which Acquiring Fund will acquire all of the assets of Acquired Fund in exchange for shares of beneficial interest in Acquiring Fund (the "Acquiring Fund Shares") and the assumption by Acquiring Fund of all of the liabilities of Acquired Fund following which the Acquiring Fund Shares received by Acquired Fund will be distributed by Acquired Fund to its stockholders in liquidation and termination of Acquired Fund. This opinion as to certain U.S. federal income tax consequences of the Reorganization is furnished to you pursuant to Section 8.6 of the Agreement. Capitalized terms not defined herein are used herein as defined in the Agreement.

Acquired Fund is a series of the Acquired Trust, which is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as an open-end management investment company. Shares of Acquired Fund are redeemable at net asset value at each stockholder's option. Acquired Fund has elected to be a regulated investment company for federal income tax purposes under Section 851 of the Internal Revenue Code of 1986, as amended (the "Code").

Acquiring Fund is a series of Acquiring Trust, which is registered under the 1940 Act as an open-end management investment company. Shares of Acquiring Fund are redeemable at net asset value at each shareholder's option.

First Sentier American Listed Infrastructure Fund November 3, 2025

For purposes of this opinion, we have considered the Agreement, the Proxy Statement/Prospectus dated August 20, 2025, and such other items as we have deemed necessary to render this opinion. In addition, each of Acquired Fund and Acquiring Fund has provided us with a letter dated as of the date hereof (collectively, the "Representation Letters") representing as to certain facts, occurrences and information upon which each of Acquired Fund and Acquiring Fund has indicated that we may rely in rendering this opinion (whether or not contained or reflected in the documents and items referred to above).

In reviewing the foregoing materials, we have assumed, with your permission, the authenticity of original documents, the accuracy of copies, the genuineness of signatures, the legal capacity of signatories, and the proper execution of documents. We have further assumed that (i) all parties to the Agreement and any other documents examined by us have acted, and will act, in accordance with the terms of such Agreement and documents, and that the Reorganization will be consummated pursuant to the terms and conditions set forth in the Agreement without the waiver or modification of any such terms and conditions; and (ii) all representations contained in the Agreement, as well as those representations contained in the Representation Letters, are true and complete.

Based on and subject to the foregoing and subject to the final paragraph hereof, we are of the opinion that, for U.S. federal income tax purposes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Reorganization will constitute a "reorganization" within
the meaning of Section 368(a) of the Code, and Acquiring Fund and Acquired Fund each will be "a party to a reorganization"
within the meaning of Section 368(b) of the Code;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) Under Sections 361 and 357(a) of the Code, Acquired Fund will not recognize
gain or loss upon the transfer of Acquired Fund's assets to Acquiring Fund in exchange for Acquiring Fund Shares and the assumption
by Acquiring Fund of all the liabilities of Acquired Fund, or upon the distribution of Acquiring Fund Shares by Acquired Fund to its stockholders
in liquidation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) Under Section 354 of the Code, Acquired Fund stockholders will not recognize
any gain or loss upon the exchange of their Acquired Fund shares for Acquiring Fund Shares in the Reorganization;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) Under Section 358 of the Code, the aggregate tax basis of Acquiring
Fund Shares an Acquired Fund stockholder receives in the Reorganization will be the same as the aggregate tax basis of the Acquired Fund
shares exchanged therefor;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) Under Section 1223(1) of the Code, an Acquired Fund stockholder's
holding period for the Acquiring Fund Shares received in the Reorganization will be determined by including the period during which such
stockholder held or is treated for federal income tax purposes as having held the Acquired Fund shares exchanged therefor, provided that
the stockholder held those Acquired Fund shares as capital assets;

First Sentier American Listed Infrastructure Fund November 3, 2025

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) Under Section 1032 of the Code, Acquiring Fund will not recognize gain
or loss upon the receipt of the assets of Acquired Fund in exchange for Acquiring Fund Shares and the assumption by Acquiring Fund of
all the liabilities of Acquired Fund;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) Under Section 362(b) of the Code, Acquiring Fund's tax basis in
the assets of Acquired Fund transferred to Acquiring Fund in the Reorganization will be the same as Acquired Fund's tax basis immediately
prior to the transfer;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) Under Section 1223(2) of the Code, the holding period in the hands of
Acquiring Fund of each Acquired Fund asset transferred to Acquiring Fund in the Reorganization will include the period during which such
asset was held or treated for federal income tax purposes as held by Acquired Fund; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) Acquiring Fund will succeed to and take into account the items of Acquired
Fund described in Section 381(c) of the Code, subject to the conditions and limitations specified in Sections 381, 382, 383 and 384 of
the Code and the Regulations thereunder.

No ruling has been or will be obtained from the IRS as to the subject matter of this opinion and there can be no assurance that the IRS or a court of law will concur with the opinion set forth above. Our opinion is based on the Code, Treasury Regulations, IRS rulings, judicial decisions, and other applicable authority, all as in effect on the date of this opinion. The legal authorities on which this opinion is based may be changed at any time. Any such changes may be retroactively applied and could modify the opinions expressed above.

---

| |
|:---|
| Very truly yours, |
| /s/ Ropes & Gray LLP |
| Ropes & Gray LLP |

---

## Exhibit 99.16

![](fp0096790-1_02.jpg)

November 3, 2025

First Sentier Global Listed Infrastructure Fund

Advisors Series Trust

P.O. Box 701

Milwaukee, WI 53201

First Sentier Global Listed Infrastructure Fund

Datum One Series Trust

333 S. Wabash Avenue

Chicago, IL 60604

Ladies and Gentlemen:

We have acted as counsel in connection with the Agreement and Plan of Reorganization (the "Agreement") dated October 27, 2025, by and among (i) Datum One Series Trust, a Massachusetts business trust ("Acquiring Trust"), on behalf of its series First Sentier Global Listed Infrastructure Fund ("Acquiring Fund"), (ii) Advisors Series Trust, a Delaware statutory trust ("Acquired Trust"), on behalf of its series First Sentier Global Listed Infrastructure Fund ("Acquired Fund"), and (iii) for purposes of Sections 4.3, 5.6, 5.8, 9.2, 10.2 and 11.3 only, First Sentier Investors (US) LLC ("FSI"). The Agreement describes a proposed transaction (the "Reorganization") to occur as of the date of this letter (the "Closing Date"), pursuant to which Acquiring Fund will acquire all of the assets of Acquired Fund in exchange for shares of beneficial interest in Acquiring Fund (the "Acquiring Fund Shares") and the assumption by Acquiring Fund of all of the liabilities of Acquired Fund following which the Acquiring Fund Shares received by Acquired Fund will be distributed by Acquired Fund to its stockholders in liquidation and termination of Acquired Fund. This opinion as to certain U.S. federal income tax consequences of the Reorganization is furnished to you pursuant to Section 8.6 of the Agreement. Capitalized terms not defined herein are used herein as defined in the Agreement.

Acquired Fund is a series of the Acquired Trust, which is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as an open-end management investment company. Shares of Acquired Fund are redeemable at net asset value at each stockholder's option. Acquired Fund has elected to be a regulated investment company for federal income tax purposes under Section 851 of the Internal Revenue Code of 1986, as amended (the "Code").

Acquiring Fund is a series of Acquiring Trust, which is registered under the 1940 Act as an open-end management investment company. Shares of Acquiring Fund are redeemable at net asset value at each shareholder's option.

First Sentier Global Listed Infrastructure Fund November 3, 2025

For purposes of this opinion, we have considered the Agreement, the Proxy Statement/Prospectus dated August 20, 2025, and such other items as we have deemed necessary to render this opinion. In addition, each of Acquired Fund and Acquiring Fund has provided us with a letter dated as of the date hereof (collectively, the "Representation Letters") representing as to certain facts, occurrences and information upon which each of Acquired Fund and Acquiring Fund has indicated that we may rely in rendering this opinion (whether or not contained or reflected in the documents and items referred to above).

In reviewing the foregoing materials, we have assumed, with your permission, the authenticity of original documents, the accuracy of copies, the genuineness of signatures, the legal capacity of signatories, and the proper execution of documents. We have further assumed that (i) all parties to the Agreement and any other documents examined by us have acted, and will act, in accordance with the terms of such Agreement and documents, and that the Reorganization will be consummated pursuant to the terms and conditions set forth in the Agreement without the waiver or modification of any such terms and conditions; and (ii) all representations contained in the Agreement, as well as those representations contained in the Representation Letters, are true and complete.

Based on and subject to the foregoing and subject to the final paragraph hereof, we are of the opinion that, for U.S. federal income tax purposes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Reorganization will constitute a "reorganization" within
the meaning of Section 368(a) of the Code, and Acquiring Fund and Acquired Fund each will be "a party to a reorganization"
within the meaning of Section 368(b) of the Code;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) Under Sections 361 and 357(a) of the Code, Acquired Fund will not recognize
gain or loss upon the transfer of Acquired Fund's assets to Acquiring Fund in exchange for Acquiring Fund Shares and the assumption
by Acquiring Fund of all the liabilities of Acquired Fund, or upon the distribution of Acquiring Fund Shares by Acquired Fund to its stockholders
in liquidation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) Under Section 354 of the Code, Acquired Fund stockholders will not recognize
any gain or loss upon the exchange of their Acquired Fund shares for Acquiring Fund Shares in the Reorganization;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) Under Section 358 of the Code, the aggregate tax basis of Acquiring
Fund Shares an Acquired Fund stockholder receives in the Reorganization will be the same as the aggregate tax basis of the Acquired Fund
shares exchanged therefor;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) Under Section 1223(1) of the Code, an Acquired Fund stockholder's
holding period for the Acquiring Fund Shares received in the Reorganization will be determined by including the period during which such
stockholder held or is treated for federal income tax purposes as having held the Acquired Fund shares exchanged therefor, provided that
the stockholder held those Acquired Fund shares as capital assets;

First Sentier Global Listed Infrastructure Fund November 3, 2025

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) Under Section 1032 of the Code, Acquiring Fund will not recognize gain
or loss upon the receipt of the assets of Acquired Fund in exchange for Acquiring Fund Shares and the assumption by Acquiring Fund of
all the liabilities of Acquired Fund;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) Under Section 362(b) of the Code, Acquiring Fund's tax basis in
the assets of Acquired Fund transferred to Acquiring Fund in the Reorganization will be the same as Acquired Fund's tax basis immediately
prior to the transfer;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) Under Section 1223(2) of the Code, the holding period in the hands of
Acquiring Fund of each Acquired Fund asset transferred to Acquiring Fund in the Reorganization will include the period during which such
asset was held or treated for federal income tax purposes as held by Acquired Fund; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) Acquiring Fund will succeed to and take into account the items of Acquired
Fund described in Section 381(c) of the Code, subject to the conditions and limitations specified in Sections 381, 382, 383 and 384 of
the Code and the Regulations thereunder.

No ruling has been or will be obtained from the IRS as to the subject matter of this opinion and there can be no assurance that the IRS or a court of law will concur with the opinion set forth above. Our opinion is based on the Code, Treasury Regulations, IRS rulings, judicial decisions, and other applicable authority, all as in effect on the date of this opinion. The legal authorities on which this opinion is based may be changed at any time. Any such changes may be retroactively applied and could modify the opinions expressed above.

---

| |
|:---|
| Very truly yours, |
| /s/ Ropes & Gray LLP |
| Ropes & Gray LLP |

---

## Exhibit 99.16

January 6, 2026

**First Sentier American Listed Infrastructure Fund**

**First Sentier Global Listed Infrastructure Fund**

Advisors Series Trust

P.O. Box 701

Milwaukee, WI 53201

**First Sentier American Listed Infrastructure Fund**

**First Sentier Global Listed Infrastructure Fund**

Datum One Series Trust

333 S. Wabash Avenue

Chicago, IL 60604

Ladies and Gentlemen:

We hereby consent to the filing, as an exhibit to Post Effective Amendment No. 2 to your Registration Statement on Form N-14 (File No. 333-288636), of our opinions, dated November 3, 2025, addressed to you as to certain tax matters related to the acquisition of the assets of (i) First Sentier American Listed Infrastructure Fund, a series of Advisors Series Trust, by First Sentier American Listed Infrastructure Fund, a series of Datum One Series Trust, and (ii) First Sentier Global Listed Infrastructure Fund, a series of Advisors Series Trust, by First Sentier Global Listed Infrastructure Fund, a series of Datum One Series Trust.

Very truly yours,

/s/ Ropes & Gray LLP

Ropes & Gray LLP