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IsoEnergy Completes C$25 Million Concurrent Private Placement with NexGen Energy

Financings

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IsoEnergy Completes C$25 Million

Concurrent Private Placement with NexGen Energy

All monetary amounts are expressed in Canadian Dollars, unless otherwise indicated.

Toronto, ON, January 27, 202 6 – IsoEnergy Ltd. (NYSE American: ISOU; TSX: ISO) (the

“Company” or “ IsoEnergy”) is pleased to announce that, further to its press release dated

January 20, 2026 and in connection with the completion of its bought deal financing (the

“Offering”), the Company has also closed its non-brokered private placement (the “Concurrent

Private Placement”) pursuant to which the Company issued 1,666,667 common shares of the

Company (the “Shares”) at a price of C$15.00 per Share to NexGen Energy Ltd. (“NexGen”) for

aggregate gross proceeds of C$25,000,005.

The proceeds from the Concurrent Private Placement are expected to be used to fund the

continued development and further exploration of the Company's mineral properties, and for

general corporate purposes.

The Concurrent Private Placement was completed to enable NexGen to maintain its pro rata

ownership interest in the Company at approximately 30% after giving effect to the Offering. The

Shares issued pursuant to the Concurrent Private Placement are subject to a statutory hold period

of four months and one day following the closing of the Concurrent Private Placement. No

commission or other fee is p ayable in connection with the sale of Shares pursuant to the

Concurrent Private Placement.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy

nor shall there be any sale of the securities in any state in which such offer, solicitation or

sale would be unlawful. The securities have not been, nor will t hey be, registered under

the United States Securities Act of 1933, as amended (the “U.S. Securities Act”) and may

not be offered or sold in the United States absent registration or an applicable exemption

from the registration requirements of the U.S. Secu rities Act, and applicable state

securities laws.

NexGen's participation in the Concurrent Private Placement constitutes a “related party

transaction” pursuant to Multilateral Instrument 61-101 – Protection of Minority Security Holders

in Special Transactions (“MI 61-101”). The Company is exempt from the requirement to obtain a

formal valuation or minority shareholder approval in connection with the Concurrent Private

Placement under MI 61-101 in reliance on Sections 5.5(a) and 5.7(1)(a) of MI 61-101 due to the

fair market value of the Concurrent Private Placement being below 25% of the Company's market

capitalization for purposes of MI 61 -101. The Company was not able to file a material change

report 21 days prior to the closing date of the Concurrent Private Placement as a result of the

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closing date. The Concurrent Private Placement was approved by the board of directors of the

Company with each of Messrs. Curyer, Patricio and McFadden having disclosed his interest in

the Concurrent Private Placement and abstaining from voting in respect thereof. The Company

has not received, nor has it requested a valuation of its securities or the subject matter of the

Concurrent Private Placement in the 24 months prior to the date hereof.

About IsoEnergy Ltd.

IsoEnergy (NYSE American: ISOU; TSX: ISO) is a leading, globally diversified uranium company

with substantial current and historical mineral resources in top uranium mining jurisdictions of

Canada, the U.S. and Australia at varying stages of development, providing near-, medium- and

long-term leverage to rising uranium prices. IsoEnergy is currently advancing its Larocque East

project in Canada’s Athabasca basin, which is home to the Hurricane deposit, boasting the world’s

highest-grade indicated uranium mineral resource. IsoEnergy also holds a portfolio of permitted

past-producing, conventional uranium and vanadium mines in Utah with a toll milling arrangement

in place with Energy Fuels. These mines are currently on standby, ready for rapid restart as market

conditions permit, positioning IsoEnergy as a near-term uranium producer.

For further information, please contact:

IsoEnergy Ltd.

Philip Williams, CEO and Director

(833) 572-2333

[email protected]

Neither the Toronto Stock Exchange nor its Regulation Services Provider (as that term is

defined in the policies of the Exchange) accepts responsibility for the adequacy or

accuracy of this press release.

Disclosure regarding forward-looking statements

This press release contains “forward-looking statements” within the meaning of the United States

Private Securities Litigation Reform Act of 1995 and “forward -looking information” within the

meaning of applicable Canadian securities legislation (collectively, referred to as “forward-looking

information”). Generally, forward -looking information can be identified by the use of forward -

looking terminology such as “plans”, “expects” or “does not expect”, “is expected”, “budget”,

“scheduled”, “estimates”, “forec asts”, “intends”, “anticipates” or “does not anticipate”, or

“believes”, or variations of such words and phrases or state that certain actions, events or results

“may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved”. This forward -looking

information may relate to the Concurrent Private Placement, including statements with respect to

the anticipated use of the net proceeds from the Concurrent Private Placement ; and any other

activities, events or developments that the Company expects or anticipates will or may occur in

the future.

Forward-looking statements are necessarily based upon a number of assumptions that, while

considered reasonable by management at the time, are inherently subject to business, market

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and economic risks, uncertainties and contingencies that may cause actual results, performance

or achievements to be materially different from those expressed or implied by forward -looking

statements. Such assumptions include, but are not limited to, the p rice of uranium; and that

general business and economic conditions will not change in a materially adverse manner.

Although IsoEnergy has attempted to identify important factors that could cause actual results to

differ materially from those contained in f orward-looking information, there may be other factors

that cause results not to be as anticipated, estimated or intended. There can be no assurance

that such information will prove to be accurate, as actual results and future events could differ

materially from those anticipated in such statements. Accordingly, readers should not place undue

reliance on forward-looking information.

Such statements represent the current views of IsoEnergy with respect to future events and are

necessarily based upon a number of assumptions and estimates that, while considered

reasonable by IsoEnergy, are inherently subject to significant business, economic, competitive,

political and social risks, contingencies and uncertainties. Risks and uncertainties include, but are

not limi ted to the following: regulatory determinations and delays; stock market conditions

generally; demand, supply and pricing for uranium; and general economic and political conditions

in Canada, the United States and other jurisdictions where the applicable p arty conducts

business. Other factors which could materially affect such forward -looking information are

described in the risk factors in IsoEnergy’s most recent annual management’s discussion and

analysis or annual information form and IsoEnergy’s other f ilings with the Canadian securities

regulators which are available under the Company’s profile on SEDAR+ at www.sedarplus.ca.

IsoEnergy does not undertake to update any forward -looking information, except in accordance

with applicable securities laws.