IsoEnergy Ltd.

The Board has adopted a written code of ethics entitled, “Code of Ethics” (as amended from time to time, the “Code”), by which it and all officers and employees of the Registrant, including the Registrant’s principal executive officer, principal financial officer and principal accounting officer or controller, abide. There were no waivers granted in respect of the Code during the fiscal year ended December 31, 2025. The Code is posted on the Registrant’s website at www.isoenergy.ca. A copy of the Code may also be obtained by contacting the Vice President, Corporate Development of the Registrant at the address or telephone number indicated on the cover page of this annual report on Form 40-F. If there is an amendment to the Code, or if a waiver of the Code is granted to any of the Registrant’s principal executive officer, principal financial officer, principal accounting officer or controller, the Registrant intends to disclose any such amendment or waiver by posting such information on the Registrant’s website. Unless and to the extent specifically referred to herein, the information on the Registrant’s website shall not be deemed to be incorporated by reference in this annual report on Form 40-F.