# EDGAR Filing Document

**Accession Number:** 0002092344
**File Stem:** 0001829126-25-008948
**Filing Date:** 2025-11
**Character Count:** 7540
**Document Hash:** 89e6952a50b170db884b8aee78d06fcd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001829126-25-008948.hdr.sgml**: 20251110

**ACCESSION NUMBER**: 0001829126-25-008948

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251110

**DATE AS OF CHANGE**: 20251110

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Montauk Renewables, Inc.
- **CENTRAL INDEX KEY:** 0001826600
- **STANDARD INDUSTRIAL CLASSIFICATION:** GAS & OTHER SERVICES COMBINED [4932]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 853189583
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92420
- **FILM NUMBER:** 251464391

**BUSINESS ADDRESS:**
- **STREET 1:** 5313 CAMPBELLS RUN ROAD
- **STREET 2:** SUITE 200
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15205
- **BUSINESS PHONE:** 4127478700

**MAIL ADDRESS:**
- **STREET 1:** 5313 CAMPBELLS RUN ROAD
- **STREET 2:** SUITE 200
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15205

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Montauk Energy, Inc.
- **DATE OF NAME CHANGE:** 20200929
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Aktiv Investment Management (Pty) Ltd
- **CENTRAL INDEX KEY:** 0002092344

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** T3
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 19 AVENUE SAINT BARTHOLOMEW FRESNAYE
- **CITY:** CAPE TOWN
- **NON US STATE TERRITORY:** WESTERN CAPE
- **PROVINCE COUNTRY:** T3
- **ZIP:** 8005
- **BUSINESS PHONE:** 0027 798413465

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 19 AVENUE SAINT BARTHOLOMEW FRESNAYE
- **CITY:** CAPE TOWN
- **NON US STATE TERRITORY:** WESTERN CAPE
- **PROVINCE COUNTRY:** T3
- **ZIP:** 8005

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Montauk Renewables, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**61218C103**

*(CUSIP Number)*

**Adrian Steven Zetler**<br>Aktiv Investment Management (Pty) Ltd<br>19 Avenue Saint Bartholomew Fresnaye<br>Cape Town, Western Cape T3 8005<br>27798413465

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**11/03/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **61218C103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Aktiv Investment Management (Pty) Ltd** | Name of reporting person<br>**Aktiv Investment Management (Pty) Ltd** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**T3** | Citizenship or place of organization<br>**T3** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**22297688.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**22297688.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**22297688.00** | Aggregate amount beneficially owned by each reporting person<br>**22297688.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**15.7%** | Percent of class represented by amount in Row (11)<br>**15.7%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** Aktiv Investment Management (Pty) Ltd is an investment manager organized under the laws of South Africa.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
Montauk Renewables, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
5313 Campbells Run Road, Suite 200, Pittsburgh, PA, 15205

Security: Common Stock, par value $0.01 per share (CUSIP Number: 61218C103, ISIN: US61218C1036) (the "Shares").

**Item 4. Purpose of Transaction**

The Reporting Person holds the Shares for investment purposes

**Item 5. Interest in Securities of the Issuer**

**(a)**
Based on public disclosures filed by the Issuer with the SEC, the Issuer currently has total of 142,256,617 shares of common stock outstanding. As of November 3, 2025, the Reporting Person has been granted, by virtue of the Investment Management Agreement, full and exclusive voting and investment authority over 22,297,588 Shares and is deemed to beneficially own in total an aggregate of 22,297,688 Shares, which represent approximately 15.7% of all of the Issuer's outstanding common stock.

**(b)**
The Reporting Person has sole power to vote and dispose of an aggregate of 22,297,688 Shares, which represents approximately 15.7% of all of the Issuer's outstanding common stock.

To the extent that the Additional Disclosed Person could be deemed to share beneficial ownership of the securities beneficially owned by the Reporting Person, the Additional Disclosed Person fully disclaims beneficial ownership of such securities.

**(c)**
As of November 10, 2025, during the past sixty days, neither the Disclosed Parties nor the Clients have purchased any Shares.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

The Reporting Person is the beneficial owner of 22,297,588 Shares pursuant to the Investment Management Agreement, under which the Reporting Person has been granted full and exclusive voting and investment authority over the Shares.

Except as set forth herein, the Reporting Person has not entered into any contracts, arrangements, understandings or relationships (legal or otherwise) with any person with respect to any securities of the Issuer, including but not limited to any contracts, arrangements, understandings or relationships concerning the transfer or voting of such securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Aktiv Investment Management (Pty) Ltd

**Signature:** /s/ Adrian Steven Zetler

**Name/Title:** Adrian Steven Zetler/Director

**Date:** 11/10/2025