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NexGen Announces Doubling of Contracted Sales Volumes with 5 Million pound Uranium Offtake Contract with Major US Utility

Mine Development & Operations Partnerships & JV

NexGen Announces

Doubling

of

Contracted

Sales

Volumes

with

5 Million pound

Uranium

Offtake Contract with Major

US

Utility

C

ontracted volumes

doubl

e

to

more than

10 million pounds

.

Market

r

elated

p

ricing

m

echanisms

providing the most

s

ignificant

leverage

to

f

uture

p

rices

at time of delivery.

Ongoing negotiations with multiple entities for additional offtake contracts.

Vancouver, BC,

August 6

, 2025

–

NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX:

NXE) (NYSE: NXE) (ASX: NXG)

i

s pleased to announce it has secured a new uranium offtake

contract with a

nother

major

US based

utility

for the delivery of 1 million pounds of uranium per

year over a five

-

year period

. C

ommencing in

the first year of

commercial production

,

t

h

is

latest

uranium sales agreement

follows

the Company’s

first

sales contracts

announced in December

2024

(

link

NR December 4, 2024)

. This contract

reflects the significant materiality of NexGen’s

Rook I Project in the future supply of uranium at a time

when

sovereign and technical risk

surrounding current production sources is at unprecedented levels worldwide.

This contract doubles NexGen's existing contracted volume

s

incorporating

significant

leverage

to

the

future

pricing of uranium

.

I

n addition

, NexGen’s Arrow Deposit

current

ly has

229.6M

lbs

of

uncontracted

reserves

to be sold optimally in the future.

Market

-

related pricing mechanisms at the time of delivery

i

s

a key element of NexGen’s offtake

strategy

.

Leigh Curyer,

Founder &

Chief Executive Officer

, commented

: “

NexGen’s

stated

strategy

simply optimize

s

the value

and return on

each pound produced

. It reflects

Rook I’s relative

technical simplicity

and

high

production

volume

certainty,

which provides our

utility

clients

confidence in the delivery of their future fuel requirements. At the same time, it provides NexGen

shareholders unprecedented

industry leading

leverage

to prices

at the time of

those

deliver

ies

.

The team is managing

a

substantial

increase in offtake

activity and

negotiation,

reflecting

NexGen

as

a

future

cornerstone of the global

nuclear

energy

market

.

In an era defined by

the intersection of energy security and national security combined with

surging demand for electrification,

NexGen

's role in enhancing energy security and independence

for its power utility clients

has never been more critical.

”

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 standard

s in environmental and

social governance. The Rook I Project is supported by a 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 minin

g 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 ent

ire mining industry socially, technically and environmentally. The Project and prospective

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 New York Stock Exchange under the ticker

symbol “NXE” and on the Australian Securities Exchange under the ticker symbol “NXG”

providing access to global investors to participate in NexGen’s mission of sol

ving 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.

For additional information and media inquiries:

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

lcuryer@nxe

-

energy.ca

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

tmcpherson@nxe

-

energy.ca

Monica Kras

Vice President, Corporate Development

NexGen Energy Ltd.

+44 (0) 7307 191933

mkras@nxe

-

energy.ca

Fo

rward

-

Looking Information

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. "Forwa

rd

-

looking information" includes, but is not limited to,

statements with respect to setting industry benchmarks with innovative and sustainable mining solutions

and reflecting ongoing commitments to maximizing benefits to partners and stakeholders, the suc

cessful

execution of the shaft sinking contract, the seamless transition to major construction following anticipated

federal Environmental Assessment and licence approvals, the delivery of clean energy fuel for the future,

the development of the largest l

ow cost producing uranium mine globally and incorporating elite standards

in environmental and social governance, delivering a project that leads the entire mining industry socially,

technically and environmentally, providing generational long

-

term economi

c, environmental and social

benefits for Saskatchewan, Canada and the world, planned exploration and development activities and

budgets, the interpretation of drill results and other geological information, mineral reserve and resource

estimates (to the ex

tent they involve estimates of the mineralization that will be encountered if a project is

developed), requirements for additional capital, capital costs, operating costs, cash flow estimates,

production estimates, the future price of uranium and similar s

tatements relating to the economics of a

project, including the Rook I Project. Generally, forward

-

looking information and statements can be

identified by the use of forward

-

looking terminology such as “plans”, “expects”, “is expected”, “budget”,

“schedule

d”, “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.

Forward

-

looking information and statements are based on NexGen’s current expectations, beliefs,

assumptions, estimates and forecasts about its business and the industry and markets in which it operates.

Forward

-

looking information and statements are made b

ased upon numerous assumptions, including,

among others, that, third

-

party contractors, including Thyssen, will perform their contracts as expected and

on time, the results of planned exploration and development activities will be as anticipated and on tim

e;

the price of uranium; the cost of planned exploration and development activities; that, as plans continue to

be refined for the development of the Rook I Project, there will be no changes in costs, engineering details

or specifications that would materi

ally adversely affect its viability; 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 and de

velopment activities will be

available on reasonable terms and in a timely manner; that there will be no revocation of government

approvals; that general business, economic, competitive, social and political conditions will not change in a

material adverse

manner; the assumptions underlying the Company’s mineral reserve and resource

estimates; assumptions made in the interpretation of drill results and other geological information; the ability

to achieve production on the Rook I Project; and other estimate

s, assumptions and forecasts disclosed in

the Feasibility Study for the Rook I Project. Although the assumptions made by the Company in providing

forward

-

looking information or making forward

-

looking statements were considered reasonable by

management at t

he time they were made, there can be no assurance that such assumptions will prove to

be accurate.

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, negative operating cash flow

and dependence on third

-

party financing, uncer

tainty of additional financing, the risk that pending assay

results will not confirm previously announced preliminary results, the imprecision of mineral reserve and

resource estimates, the price and appeal of alternate sources of energy, sustained low ura

nium prices,

aboriginal title and consultation issues, exploration and development risks, climate change, uninsurable

risks, reliance upon key management and other personnel, risks related to title to its properties, information

security and cyber threats,

failure to manage conflicts of interest, failure to obtain or maintain required

permits and licences, changes in laws, regulations and policy, competition for resources, political and

regulatory risks, general inflationary pressures, industry and economic

factors that may affect the business,

and other factors discussed or referred to in the Company’s most recent Annual Information Form under

“Risk Factors” and management’s discussion and analysis under “Other Risks Factors” filed on SEDAR+

at

www.sedarplus.ca

and 40

-

F filed on 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 b

e 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.