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NexGen Announces Upsized AUD $600 Million Equity Offering in Australia

Financings

NexGen Announces Upsized AUD $600 Million Equity Offering in Australia

Vancouver, BC, October 2, 2025 – NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG)

(“NexGen” or the “Company”) announced today that it is has entered into an amended and restated

underwriting agreement with Aitken Mount Capital Partners Pty Ltd (the “Australian Underwriter”)

to upsize its previously announced offering and pursuant to which the Australian Underwriter has

agreed to fully underwrite an offering of 45,801,527 common shares in the capital of the Company

(the “Australian Common Shares”), to be settled in the form of Australian CHESS Depositary

Interests, at a price of A$13.10 per share (the “ Offering Price ”), for gross proceeds of

approximately AUD $ 600 million (the “ Australian Offering”). In accordance with a separate

amended and restated appointment letter, Canaccord Genuity (Australia) Limited (the “Australian

JLM”) acted as joint lead manager and bookrunner to the upsized Australian Offering.

The Company confirms that the bookbuild for the upsized Australian Offering has successfully

closed.

As previously announced, concurrent with the Australian Offering, the Company also launched a

bought deal equity offering with a syndicate of underwriters (the “North American Underwriters”)

led by Merrill Lynch Canada Inc. under which the North American Underwriters have agreed to buy

on a bought deal basis 33,112,583 common shares in the capital of the Company (the “ North

American Common Shares”) at a price of C$12.08 per North American Common Share , the

Canadian dollar equivalent to the Offering Price1, for gross proceeds of approximately C$400

million (the “North American Offering”, and together with the Australian Offering, the “Offering”).

The Company intends to use the net proceeds from the Offering to advance engineering of the Rook

I Project, for Rook I Pre-Production Capital Costs and for general corporate purposes.

The North American Common Shares will be offered by way of a short form prospectus (the

“Prospectus”) in all provinces and territories of Canada, other than Quebec, and will be offered in

the United States pursuant to a prospectus filed as part of a registration statement under the

Canada/U.S. multi-jurisdictional disclosure system. A registration statement on Form F-10, including

the U.S. preliminary prospectus (together with any amendments thereto, the “ Registration

Statement”), registering the North Amer ican Common Shares under the U.S. Securities Act of

1933, as amended (the “U.S. Securities Act”) has been filed with the United States Securities and

Exchange Commission (the “SEC”) but has not yet become effective. The preliminary Prospectus

and Registration Statement are subject to completion and amendment. Such documents contain

important information about the North American Offering.

The Australian Common Shares will be issued without disclosure under the Australian Corporations

Act 2001 (Cth) (the “Australian Corporations Act”) to “sophisticated investors” and “professional

investors” (within the meaning of sub -sections 708(8) and 708(11) of the Australian Corporations

Act) and investors in other jurisdictions that may lawfully participate.

This news release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall

there be any sale of the North American Common Shares or the Australian Common Shares

(collectively, the "Offered Common Shares") in any jurisdiction in which such offer, solicitation or

1 Based on the Bloomberg exchange rate as quoted on October 1, 2025 (C$1.00 = A$1.0850).

sale would be unlawful prior to registration or qualification under the securities laws of that

jurisdiction.

The Offering is expected to close on or about October 15, 2025 (EST) and is subject to the Company

receiving all necessary regulatory approvals, including conditional acceptance of the Toronto Stock

Exchange and approval by the New York Stock Exchange (the “NYSE”). The preliminary Prospectus

is available on SEDAR+ at www.sedarplus.ca. The Registration Statement is available on the SEC’s

website at www.sec.gov. The Offered Common Shares to be sold in the Offering described in this

document may not be sold nor may offers to buy be accepted prior to the time the Registration

Statement becomes effective. Before readers invest, they should read the prospectus in th e

Registration Statement and other documents the Company has filed with Canadian regulatory

authorities and the SEC for more complete information about the Company and the Offering.

Potential investors may get any of these documents for free by visiting EDGAR on the SEC website

at www.sec.gov or, when such documents become available, via SEDAR+ at www.sedarplus.ca, or

the Australian Securities Exchange (“ASX”) at www.asx.com.au. Copies of the Prospectus relating

to the North American Offering may be obtained for free upon request in Canada by contacting

Merrill Lynch Canada Inc. , Attention: Doug Butters, 181 Bay Street, Suite 400, Toronto ON M5J

2V8, by telephone at 416-369-3953, and in the United States by contacting BofA Securities,

Attention: Prospectus Department, 201 North Tryon Street, Charlotte, NC 28255-0001, or by email

at [email protected].

The completion of the North American Offering is not conditional upon the completion of the

Australian Offering and the completion of the Australian Offering is not conditional upon the

completion of the North American Offering, and the North American Unde rwriters have no

obligations or liability with respect to the Australian Offering and the Australian Underwriter and the

Australian JLM have no obligations or liability with respect to the North American Offering.

About NexGen

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The

Company's flagship Rook I Project is being optimally developed into the largest low-cost producing

uranium mine globally, incorporating the most elite environmental and social governance standards.

The Rook I Project is supported by an NI 43-101 compliant Feasibility Study, which outlines the elite

environmental performance and industry -leading economics. NexGen is led by a team of

experienced uranium and mining industry professionals with expertise across the entire mining life

cycle, including exploration, financing, project engineering and construction, operations and closure.

NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry

socially, technically and environmentally. The Project and prospect ive portfolio in northern

Saskatchewan will provide generational, long-term economic, environmental, and social benefits for

Saskatchewan, Canada, and the world.

NexGen is listed on the Toronto Stock Exchange, the NYSE under the ticker symbol "NXE," and on

the ASX under the ticker symbol "NXG," providing access to global investors to participate in

NexGen's mission of solving three major global challenges in decarbonization, energy security and

access to power. The Company is headquartered in Vancouver, British Columbia, with its primary

operations office in Saskatoon, Saskatchewan.

This news release has been approved by the Board.

For additional information and media inquiries:

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Monica Kras

Vice President, Corporate Development

NexGen Energy Ltd.

+44 (0) 7307 191933

[email protected]

Neither the Toronto Stock Exchange nor the NYSE has reviewed or accepted responsibility for the

accuracy or adequacy of this press release, which has been prepared by management.

Cautionary Note Regarding Forward-Looking Statements

The information contained herein contains "forward -looking statements" within the meaning of

applicable United States securities laws and regulations and "forward-looking information" within

the meaning of applicable Canadian securities legislation. "Forward -looking information" includes,

but is not limited to, statements with respect to anticipate sale and distribution of North American

Common Shares under the North American Offering and Australian Common Shares under the

Australian Offering, the expected use of the net proceeds from any sales of Offered Common

Shares, the filing of the Prospectus, the prospectus relating to the Australian Offering, and the

Registration Statement, the closing of the Offering, and the receipt of all necessary securities

exchange and other regulatory approvals. Generally, but not always, forward -looking information

and statements can be identified by the use of words such as " plans", "expects", "is expected",

"budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or the negative

connotation thereof 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" or the negative

connotation thereof. Statements relating to "mineral resources" are deemed to be forward -looking

information, as they involve the implied assessment that, based on certai n estimates and

assumptions, the mineral resources described can be profitably produced in the future.

Forward-looking information and statements are based on the then current expectations, beliefs,

assumptions, estimates and forecasts about NexGen's business and the industry and markets in

which it operates. Forward -looking information and statements are m ade based upon numerous

assumptions, including among others, that the mineral reserve and resources estimates and the

key assumptions and parameters on which such estimates are based are as set out in this news

release and the technical report for the property, the results of planned exploration activities are as

anticipated, the price and market supply of uranium, the cost of planned exploration activities, that

financing will be available if and when needed and on reasonable terms, that third party contractors,

equipment, supplies and governmental and other approvals required to conduct NexGen's planned

exploration activities will be available on reasonable terms and in a timely manner and that general

business and economic conditions will not change in a material adverse manner. Although the

assumptions made by the Company in providing forward -looking information or making forwar d-

looking statements are considered reasonable by management at the time, there can be no

assurance that such assumptions will prove to be accurate in the future.

Forward-looking information and statements also involve known and unknown risks and

uncertainties and other factors, which may cause actual results, performances and achievements

of NexGen to differ materially from any projections of results, performances and achievements of

NexGen expressed or implied by such forward-looking information or statements, including, among

others, the existence of negative operating cash flow and depen dence on third party financing,

uncertainty of the availability of additional financing, the risk that pending assay results will not

confirm previously announced preliminary results, conclusions of economic valuations, the risk that

actual results of exploration activities will be different than anticipated, the cost of labour, equipment

or materials will increase more than expected, that the future price of uranium will decline or

otherwise not rise to an economic level, the appeal of alternate sources of energy to uranium -

produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that mineral

resources and reserves are not as estimated, that actual costs or actual results of reclamation

activities are greater than expected, that ch anges in project parameters and plans continue to be

refined and may result in increased costs, of unexpected variations in mineral resources and

reserves, grade or recovery rates or other risks generally associated with mining, unanticipated

delays in obtaining governmental, regulatory or First Nations approvals, risks related to First Nations

title and consultation, reliance upon key management and other personnel, deficiencies in the

Company's title to its properties, uninsurable risks, failure to manage conflicts of interest, failure to

obtain or maintain required permits and licences, risks related to changes in laws, regulations, policy

and public perception, as well as those factors or other risks as more fully described in NexGen's

Annual Information Form dated March 3, 2025 filed with the securities commissions of all of the

provinces of Canada except Quebec and in NexGen's 40-F filed with the SEC, which are available

on SEDAR+ at www.sedarplus.ca and Edgar at www.sec.gov.

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

to differ materially from those contained in the forward-looking information or statements or implied

by forward-looking information or statements, there may be other factors that cause results not to

be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on

forward-looking information or statements due to the inherent uncertainty thereof.

There can be no assurance that forward -looking information and statements will prove to be

accurate, as actual results and future events could differ materially from those anticipated, estimated

or intended. Accordingly, readers should not place undue reli ance on forward-looking statements

or information. The Company undertakes no obligation to update or reissue forward -looking

information as a result of new information or events except as required by applicable securities laws.