# EDGAR Filing Document

**Accession Number:** 0001997377
**File Stem:** 0000912282-25-000717
**Filing Date:** 2025-6
**Character Count:** 6134
**Document Hash:** 2e80845affb46fc626b2c8c24ad1f071
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912282-25-000717.hdr.sgml**: 20250625

**ACCESSION NUMBER**: 0000912282-25-000717

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250625

**DATE AS OF CHANGE**: 20250625

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IsoEnergy Ltd.
- **CENTRAL INDEX KEY:** 0001997377
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS METAL ORES [1090]
- **ORGANIZATION NAME:** International Corp Fin
- **EIN:** 000000000
- **STATE OF INCORPORATION:** A9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95086
- **FILM NUMBER:** 251074818

**BUSINESS ADDRESS:**
- **STREET 1:** 217 QUEEN STREET WEST, SUITE 401
- **CITY:** TORONTO
- **STATE:** A6
- **ZIP:** M5V 0R2
- **BUSINESS PHONE:** (306) 653-6255

**MAIL ADDRESS:**
- **STREET 1:** 217 QUEEN STREET WEST, SUITE 401
- **CITY:** TORONTO
- **STATE:** A6
- **ZIP:** M5V 0R2
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NexGen Energy Ltd.
- **CENTRAL INDEX KEY:** 0001698535
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS METAL ORES [1090]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 840123707
- **STATE OF INCORPORATION:** A1
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 1021 WEST HASTINGS STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 0C3
- **BUSINESS PHONE:** (604) 428-4112

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 1021 WEST HASTINGS STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 0C3

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**IsoEnergy Ltd.**

*(Name of Issuer)*

**Common Shares, no par value**

*(Title of Class of Securities)*

**46500E867**

*(CUSIP Number)*

**Attn:  Benjamin Salter**<br>NexGen Energy Ltd.<br>1021 West Hastings Street, Suite 3150<br>Vancouver A1 V6E 0C3<br>(604) 428-4112

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

**06/24/2025**

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

| **CUSIP No.** | **46500E867** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**NexGen Energy Ltd.** | Name of reporting person<br>**NexGen Energy Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (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>**BRITISH COLUMBIA** | Citizenship or place of organization<br>**BRITISH COLUMBIA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**16478746.00** |
| 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>**16478746.00** |
| 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>**16478746.00** | Aggregate amount beneficially owned by each reporting person<br>**16478746.00** | |
| 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>**30.9%** | Percent of class represented by amount in Row (11)<br>**30.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Prior to the date the Issuer became a reporting issuer, the Reporting Person held 15,278,746 shares (31.8%).  The Issuer became a reporting issuer on April 25, 2025.  On June 24, 2025, the Reporting Person acquired an additional 1,200,000 common shares, in the ordinary course of business, as part of a larger equity offering of 5,121,500 common shares by the Issuer.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Shares, no par value

**(b) Name of Issuer:**
IsoEnergy Ltd.

**(c) Address of Issuer's Principal Executive Offices:**
217 Queen Street West, Suite 401, Toronto, A6, M5V 0R2

**Item 4. Purpose of Transaction**

Reporting Person previously held 15,278,746 common shares of the Issuer, approximately 31.8% of the Issuer's outstanding shares prior to the date the Issuer became a U.S. reporting Issuer.  On June 24, 2025, the Reporting Person purchased an additional 1,200,000 common shares of the Issuer, in the ordinary course of business, at a price of C$10.00 per share, in connection with a larger equity offering of 5,121,500 common shares by the Issuer (which increased the Issuer's total outstanding shares to 53,267,314 common shares).

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

**(a)**
30.9%

**(b)**
16,478,746

**(c)**
Issuer private placement offering

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

None

### 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:** NexGen Energy Ltd.

**Signature:** /s/ Benjamin Salter

**Name/Title:** Benjamin Salter, CFO of NexGen Energy Ltd.

**Date:** 06/25/2025