By-Law

Certificate of Continuance – Canada Business Corporation Act

Audit and Risk Committee Charter

Board of Directors Charter

Environmental and Sustainability Committee Charter

Governance and Nomination Committee Charter

Human Resources Committee Charter

Policy Regarding Tenure on the Board of Directors

Clawback Policy

Code of Ethics

Directors and Officers Investment Policy

Internal Whistle Blowing Policy

Majority Voting Policy

Policy Regarding Diversity in Corporate Talent

Policy Regarding the Diversity of the Board of Directors

Securities Trading Policy

Policy on the Prevention of Psychological or Sexual Harassment in the Workplace and the Handling of Complaints

Disclosure Policy

Environmental Policy

Health and Safety Policy

Protection of Privacy Policy

Securities Ownership Guidelines

Chair of the Board

Chief Executive Officer

Committee Chair

Lead Director

Stock Option Plan

Employee Share Purchase Plan

Deferred Share Unit Plan

Restricted Share Unit Plan

2023 ESTMA Report

2022 ESTMA Report

2021 ESTMA Report

2020 ESTMA Report

2018 ESTMA Report

Report 2023

Within Osisko Development Corp., the following privacy officer is responsible for the protection of personal information:

Audrey Lamothe
Osisko Development Corp.
1100 Avenue des Canadiens-de-Montréal, Suite 300
Montreal, Quebec, H3B 2S2
Privacyofficer@osiskodev.com

THE FOLLOWING TERMS GOVERN THE USE OF THE WEBSITE WWW.OSISKODEV.COM (THIS “SITE” OR OUR “SITE”). BY ACCESSING THIS SITE, YOU AGREE TO THE CONDITIONS THAT FOLLOW:

Terms of use

This Site is purely a public resource of general information about Osisko Development Corp. (“Osisko” or the “Company”). Although we intend that the information on our Site is correct, we do not represent or guarantee the accuracy, adequacy or completeness of any of the information, its fitness for any particular purpose or this Site’s freedom from computer viruses. The facts and information provided on this Site are for informational purposes only. Users should not rely on information on this Site for any purpose other than for gaining general knowledge of Osisko. Material in our Site may be changed or updated from time to time without notice.

Any other websites which you may access through this Site are provided to you for convenience only. These other websites are independent from our Site and we have no control over their availability or content. A hyperlink to these other websites does not mean that we endorse or take any responsibility for the use or content of such other websites.

Accordingly, neither we nor any of our associates nor any other party involved in creating, producing or delivering this Site, shall be liable in any manner whatever for any direct, indirect, incidental, consequential, or punitive damages, losses, liabilities, expenses or costs of whatsoever nature, arising from or attributable to anyone having access to, or using, or not being able to use, this Site or any other website which is hyperlinked to this Site.

Caution Regarding forward-looking Statements

The information contained on this Site should not be construed as a prospectus, a formal support to any capital raising activity or as an invitation to invest or otherwise deal in the shares or other securities or instruments of Osisko or any of its associates.

This Site contains “forward-looking statements” within the meaning of applicable Canadian securities legislation, concerning the business, operations and financial performance and condition of Osisko. All statements on this Site, other than statements of historical fact, that address events or developments that Osisko expects to occur, are “forward-looking statements”. “Forward-looking statements” are generally, but not always, identified by the words “expects”, “plans”, “anticipates”, “believes”, “intends”, “estimates”, “projects”, “potential”, “scheduled” and similar expressions, or that events or conditions “will”, “would”, “may”, “could” or “should” occur and include statements regarding the performance of the assets of Osisko, the potential of Osisko, future price of gold and silver, the timing and amount of estimated future production, costs of production, currency fluctuations, capital expenditures, permitting timelines, the requirements of future capital, drill results and the estimation of mineral resources and reserves.

Osisko believes that the expectations expressed in “forward-looking statements” contained on this Site are based on reasonable assumptions. However, such “forward-looking statements” are not guarantees of future performance and actual results may differ materially from any such “forward-looking statements”. No assurance can be given that these expectations will prove to be correct and “forward-looking statements” contained on this Site should not be relied upon. Factors that could cause the actual results to differ materially from those in “forward-looking statements” include gold prices, Osisko’s interests, performance of the Cariboo Gold Project and other mining assets, access to skilled consultants, results of mining operation, exploration and development activities, with production and development stage mining operations, uninsured risks, regulatory changes, defects in title, availability of personnel, materials and equipment, timeliness of government or court approvals, actual performance of facilities, equipment and processes relative to specifications and expectations, unanticipated environmental impacts on operations market prices, continued availability of capital and financing and general economic, market or business conditions.

Many factors, known and unknown, could cause the actual results to be materially different from those expressed or implied by “forward-looking statements” contained on this Site. For additional information with respect to these and other factors and assumptions underlying the forward-looking statements, see the section entitled “Risk Factors” in the most recent Annual Information Form of Osisko which is filed with the Canadian securities commissions and available electronically under Osisko’s issuer profile on SEDAR at www.sedar.com.

Investors and others who consider the “forward-looking statements” contained on this Site should carefully review the above factors as well as the uncertainties they represent and the risk they entail. Moreover, these “forward-looking statements” may not be suitable for establishing strategic priorities and objectives, future strategies or actions, financial objectives and projections other than those mentioned above. The “forward-looking statements” contained on this Site are expressly qualified by this cautionary statement. Osisko undertakes no obligation to publicly update or revise any such “forward-looking statements”, whether as a result of new information, future events or otherwise, other than as required by applicable law.

Trademarks and copyright

Certain names, graphics, logos, icons, designs, words, titles or phrases on this website may constitute trade names or trademarks of Osisko. The display of any trade mark does not imply that a license of any kind to use the trade mark has been granted. All information found in the pages of this Site is protected under the copyright laws of Canada and in other countries. Unless otherwise specified, no user has permission to copy, redistribute, reproduce or republish, in any form, any information found in the pages of this Site. Any user who, without authorization, re-transmits, copies or modifies any trademarks may violate federal or common law trade mark and/or copyright law, and may be subject to legal action.

Disclosure of mineral reserves and mineral resources

Site users are advised that under National Instrument 43-101 – Standards of Disclosure for Mineral Projects, Canadian securities law requires that each category of Mineral Reserve and Mineral Resource be reported separately. Users should consult the Company’s public filings in order to obtain this information in detail. These documents are available on SEDAR at www.sedar.com under the issuer profile of Osisko Development Corp..

Disclaimer

The Company regularly updates the information on this Site. However, this information does not constitute a comprehensive picture of the Company’s business and is presented without any form of representation, guarantee or promise, expressed or implied, as to its accuracy, completeness or timely update. In this regard, the Company expressly revokes any responsibility of guarantees, expressed or implied, including and without limitation to, any guarantee of quality or compliance, in respect to any end result.

Material on this Site may contain inaccuracies, omissions or typographical errors, for which Osisko assumes no responsibility. In no event shall Osisko, its directors, officers, employees, representatives and advisers, be held liable or responsible for any claim or damage, direct or indirect, special or consequential, incurred by the user arising out of the interpretation, reliance upon or other use of the information contained in the pages of this Site.

This Site contains links to websites owned or operated by other entities which are not associated or affiliated with Osisko. These links are provided solely as a convenience to you and the inclusion of any link does not imply endorsement, investigation or verification by Osisko of the linked website or information contained therein or of their security or privacy practices. Osisko shall not be responsible for the content of any other linked websites and makes no representation or warranty regarding any other websites or the contents on such websites. If you decide to access other websites, you do so at your own risk and agree to indemnify and hold Osisko harmless from any costs or liabilities incurred. Framing of this Site or any of its content in any form and by any method is strictly prohibited. This Site may display content or pages of third party websites. Osisko undertakes no responsibility to ensure that any third party content or pages on this Site is up-to-date or accurate.

Confidentiality Policy

Osisko considers the care and protection of your personal information to be of utmost importance. With the goal of ensuring that your rights in this area are fully respected, we have designed a policy that clearly outlines our practices regarding how we use information we gather about you.

Browsing Data

When you browse this Site, you do so anonymously. Osisko does not collect personal information. For statistical purposes only, we log your domain and IP address (the Internet address of your computer) automatically when you visit this Site to give the Company an idea of which parts of this Site you visit and how long you spend there. However, this information does not identify you as an individual, but only the computer that you are using to view this Site and your approximate geographic location.

Cookies are small text files placed on your computer by websites that you visit to make websites work, or work more efficiently, as well as to provide information to the owners of the website. This Site uses Google Analytics cookies to collect information about how visitors use our Site. This service has its specific privacy policy, which can be found at the following URL:http://www.google.com/intl/en/privacy/privacy-policy.html. We use this information to compile reports and to help us improve our Site and the user experience. The cookies collect information in an anonymous form, including the number of visitors to this Site, where visitors have come to this Site from and the pages they visited. By accessing and using this Site, you consent to the processing of data about you for the purposes set out above.

Your web browsers may allow some control of cookies through the browser settings. You may learn more about cookies, including how to see what cookies have been set and how to manage and delete them, at www.allaboutcookies.org. To opt out of being tracked by Google Analytics across all websites visit http://tools.google.com/dlpage/gaoptout.

Google Analytics

We use Google Analytics, service provided by Google Inc., to collect anonymous traffic data to help us analyze usage trends on our website. This data, which includes information such as the number of site visits, pages viewed, and session duration, is transmitted and stored by Google on their servers. Google may also transfer this information to third parties. Learn about how Google uses data from Google Analytics and how to opt out from Google Analytics by following the following link: For more information on disabling Google Analytics and its privacy policy click here.