This prospectus relates to the offer and resale from time to time by certain selling shareholders named in this prospectus (the “Selling Holders”) of up to 2,069,122 of our ordinary shares, with no par value (the “Ordinary shares”). 1,954,049 of such Ordinary shares (the “Loan Funded Shares”) were issued in connection with certain loan agreements between us and the Selling Holders of the Loan Funded Shares (such Selling Holders, the “LFS Selling Holders”) or persons who nominated the LFS Selling Holders to hold such shares (together, the “Loan Agreements”).

We are not selling any securities under this prospectus and will not receive any proceeds from the sale of the Ordinary shares by the Selling Holders pursuant to this prospectus. However, we may receive all or a portion of the proceeds from the sale of any Loan Funded Shares by the LFS Selling Holders pursuant to this prospectus in connection with the repayment of outstanding borrowings under the Loan Agreements. See “Use of Proceeds” and “Selling Holders” for additional information.

Our registration of the Ordinary shares covered by this prospectus does not mean that the Selling Holders will offer or sell any of the Ordinary shares. The Selling Holders may offer, sell or distribute all or a portion of the Ordinary shares hereby registered publicly or through private transactions at prevailing market prices or at negotiated prices. We provide more information about how the Selling Holders may sell the Ordinary shares in the section entitled “Plan of Distribution.” We will bear all costs and expenses and fees in connection with the registration of these Ordinary shares. We will not be paying any underwriting discounts or commissions in any offerings pursuant to this prospectus.

Our Ordinary shares are listed on the Nasdaq Global Select Market (“Nasdaq”) under the symbol “IREN”. On February 14, 2024, the last reported sale price of our Ordinary shares was $8.30 per Ordinary share.

We are both an “emerging growth company” as that term is used in the Jumpstart Our Business Startups Act of 2012 and a “foreign private issuer” as defined under the U.S. federal securities laws and, as such, have elected to comply with certain reduced public company reporting requirements for this prospectus and future filings. See “Prospectus Summary—Implications of Being an Emerging Growth Company and a Foreign Private Issuer” for additional information.

Investing in our securities involves a high degree of risk. See the “Risk Factors” section beginning on page 7 of this prospectus and, if applicable, any risk factors described in our Securities and Exchange Commission (“SEC”) filings that are incorporated by reference in this prospectus.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, (the “SEC”), using a “shelf” registration process. Under this shelf registration process, the Selling Holders may, from time to time, sell the Ordinary shares offered by them described in this prospectus in one or more offerings or otherwise as described under “Plan of Distribution.” We will not receive any proceeds from the sale by the Selling Holders of the securities offered by them described in this prospectus. However, we may receive all or a portion of the proceeds from the sale of any Ordinary shares by the Selling Holders pursuant to this prospectus in connection with the repayment of outstanding borrowings under the Loan Agreements. See “Use of Proceeds” and “Selling Holders” for additional information.

Before buying any of the securities that are offered by this prospectus, you should carefully read this prospectus with all of the information incorporated by reference in this prospectus, as well as the additional information described under the heading “Where You Can Find Additional Information” and “Information Incorporated by Reference.” These documents contain important information that you should consider when making your investment decision. We have filed or incorporated by reference exhibits to the registration statement of which this prospectus forms a part. You should read the exhibits carefully for provisions that may be important to you.

To the extent there is a conflict between the information contained in this prospectus, on the one hand, and the information contained in any document incorporated by reference in this prospectus, on the other hand, you should rely on the information in this prospectus, provided that if any statement in one of these documents is inconsistent with a statement in another document having a later date—for example, a document incorporated by reference in this prospectus—the statement in the document having the later date modifies or supersedes the earlier statement.

The information contained in this prospectus or any document incorporated by reference in this prospectus is accurate only as of their respective dates, regardless of the time of delivery of this prospectus or the documents incorporated by reference in this prospectus or the sale of any securities. Our business, financial condition, results of operations and prospects may have changed materially since those dates.

Neither we nor the Selling Holders have authorized anyone to provide you with information that is different from that contained in this prospectus, any amendment or supplement to this prospectus, or any free writing prospectus we may authorize to be delivered or made available to you. Neither we nor the Selling Holders take responsibility for, or provide assurance as to the reliability of, any other information that others may give you. This prospectus does not constitute an offer to sell or the solicitation of an offer to buy any securities other than the securities described in this prospectus or an offer to sell or the solicitation of an offer to buy such securities in any circumstances in which such offer or solicitation is unlawful.

For investors outside the United States: Neither we nor the Selling Holders have taken any action that would permit the offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the securities described herein and the distribution of this prospectus outside the United States.

Unless otherwise indicated or the context otherwise requires, all references in this prospectus to “Iris Energy,” the “Company,” “we,” “our,” “ours,” “us” or similar terms refer to Iris Energy Limited and its subsidiaries.

We have unregistered trademarks and service marks, and registered website domain, company and business names that we use in connection with the operation of our business. These include, among others, Iris Energy and www.irisenergy.co. Other trademarks and service marks referenced in this prospectus are, to our knowledge, the property of their respective owners.

All references to “U.S. dollars,” “dollars,” “$,” “USD” or “US$” are to the U.S. dollar. All references to “Australian dollars,” “AUD” or “A$” are to the Australian dollar, the official currency of Australia. All

references to “Canadian dollars,” “CAD” or “C$” are to the Canadian dollar, the official currency of Canada. All references to “IFRS” are to International Financial Reporting Standards, as issued by the International Accounting Standards Board, or the IASB. References to a particular “fiscal year” are to Iris Energy’s fiscal year ended June 30 of that year.

Any discrepancies in any table between totals and sums of the amounts listed are due to rounding. Certain monetary amounts, percentages and other figures included in this prospectus have been subject to rounding adjustments. Accordingly, figures shown as totals in certain tables may not be the arithmetic aggregation of the figures that precede them, and figures expressed as percentages in the text may not total 100% or, as applicable, when aggregated may not be the arithmetic aggregation of the percentages that precede them.

This prospectus includes market, economic, and industry data as well as certain statistics and information relating to our business, markets, and other industry data, which we obtained or extrapolated from various third-party industry and research sources, as well as assumptions that we have made that are based on those data and other similar sources. Industry publications and other third-party surveys and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable, but that the accuracy and completeness of such information is not guaranteed. While we believe that such data is reliable, we have not independently verified such data and cannot guarantee the accuracy or completeness thereof. Additionally, we cannot assure you that any of the assumptions underlying these statements are accurate or correctly reflect our position in the industry, and not all of our internal estimates have been verified by any independent sources. Furthermore, we cannot assure you that a third-party using different methods to assemble, analyze, or compute market data would obtain the same results. There is no precise definition for what constitutes the Bitcoin mining market, the HPC solutions market or any other market or industry referenced in this prospectus. We do not intend, and do not assume any obligations, to update industry or market data set forth in this prospectus. Finally, behavior, preferences, and trends in the marketplace tend to change. As a result, investors and prospective investors should be aware that data in this prospectus and estimates based on such data may not be reliable indicators of future results.

References to “market share” and “market leader” are based on global revenues in the referenced market, and unless otherwise specified herein, are based on certain of the materials referenced above.

Throughout this prospectus, we use a number of industry terms and concepts which are defined as follows:

Investing in our securities involves risk. Before making a decision to invest in our securities, you should carefully consider the risks described in our then most recent Annual Report on Form 20-F, and any updates to those risk factors in our reports on Form 6-K incorporated by reference in this prospectus, together with all of the other information appearing or incorporated by reference in this prospectus, in light of your particular investment objectives and financial circumstances. Although we discuss key risks in our discussion of risk factors, new risks may emerge in the future, which may prove to be significant. We cannot predict future risks or estimate the extent to which they may affect our business, results of operations, financial condition and prospects.

This prospectus and the documents incorporated by reference into this prospectus contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Exchange Act, that involve substantial risks and uncertainties. Forward-looking statements include information concerning possible or assumed future results of operations, including descriptions of our business plan and strategies and trends we expect to affect our business. These statements often include words such as “anticipate,” “expect,” “suggests,” “plan,” “believe,” “intend,” “estimates,” “targets,” “projects,” “should,” “could,” “would,” “may,” “will,” “forecast,” and other similar expressions.

We base these forward-looking statements or projections on our current expectations, plans and assumptions that we have made in light of our experience in the industry, as well as our perceptions of historical trends, current conditions, expected future developments and other factors we believe are appropriate under the circumstances and at such time. As you read and consider this prospectus and the documents incorporated by reference into this prospectus, you should understand that these statements are not guarantees of future performance or results. The forward-looking statements and projections are subject to and involve risks, uncertainties and assumptions and you should not place undue reliance on these forward-looking statements or projections. Although we believe that these forward-looking statements and projections are based on reasonable assumptions at the time they are made, you should be aware that many factors could affect our actual financial results or results of operations, and could cause actual results to differ materially from those expressed in the forward-looking statements and projections. Factors that may materially affect such forward-looking statements and projections include, but are not limited to:

Forward-looking statements speak only as of the ‎date on which they were made. Because forward-looking statements are inherently subject to risks and ‎uncertainties, some of which cannot be predicted or quantified and some of which are beyond our control, you ‎should not rely on these forward-looking statements as predictions of future events. Moreover, we operate in an ‎evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for ‎management to predict all risk factors and uncertainties. Except as required by applicable law, we do not plan to ‎publicly update or revise any forward-looking statements, whether as a result of any new information, future ‎events, changed circumstances or otherwise. You should read this prospectus, the documents incorporated by ‎reference in this prospectus and the documents that we have filed as exhibits to the registration statement of which ‎this prospectus is a part completely and with the understanding that our actual future results may be materially ‎different from what we expect.‎

Any Ordinary shares offered by the Selling Holders pursuant to this prospectus will be sold by the Selling Holders for their respective accounts. We are not selling any securities under this prospectus and will not receive any of the proceeds from the sale of the Ordinary shares by the Selling Holders pursuant to this prospectus. However, we may receive all or a portion of the proceedings from the sale of any Loan Funded Shares by the LFS Selling Holders pursuant to this prospectus in connection with the repayment of outstanding borrowings under the Loan Agreements. See “Selling Holders” for additional information. As of January 31, 2024, an aggregate of A$5.4 million of borrowings was outstanding under the Loan Agreements. We currently intend to use any proceeds we receive from repayment of the Loan Agreements for working capital and general corporate purposes.

The Selling Holders will pay any underwriting fees, discounts and selling commissions incurred by such Selling Holders in connection with any sale of their Ordinary shares. The Company will bear all other costs, fees and expenses incurred in effecting the registration of the Ordinary shares covered by this prospectus, including, without limitation, all registration and filing fees, Nasdaq listing fees and fees and expenses of counsel and independent registered public accountants. The Company may also agree to reimburse certain Selling Holders for all or a portion of any underwriting fees, discounts and selling commissions incurred by such Selling Holders in connection with any sale of their Ordinary shares offered by such Selling Holders pursuant to this prospectus.

We cannot currently determine the price or prices at which the Ordinary shares may be sold by the Selling Holders under this prospectus.

Since our incorporation, we have not declared or paid any dividends on our issued share capital. Any determination to pay dividends in the future will be at the discretion of our board and subject to Australian law. If our board of directors elects to pay dividends, the form, frequency and amount will depend upon our future operations and earning, capital requirements and surplus, general financial conditions, contractual restrictions and other factors that our board of directors may deem relevant. B Class shares do not confer on their holders any right to receive dividends.

We are a public company incorporated under the laws of Australia with limited liability. Some or all of our directors may be non-residents of the United States and substantially all of their assets are located outside the United States. As a result, it may not be possible or practicable for you to:

You may also have difficulties enforcing in courts outside the United States judgments that are obtained in U.S. courts against any of our non-U.S. resident directors or us, including actions under the civil liability provisions of the U.S. securities laws. Australia has developed a different body of securities laws as compared to the United States and may provide protections for investors to a lesser extent.

It may be difficult (or impossible in some circumstances) for Australian companies to commence court action or proceedings before the federal courts of the United States or other jurisdiction in which it conducts business or has assets. This may make it difficult for us to recover amounts we are owed and to generally enforce our rights, which may have an adverse impact on our operations and financial standing. Even where we are able to enforce our rights, this may be costly and/or time consuming, risky, and may not guarantee recovery, which in turn may have an adverse impact on our operations and financial standing.

There are no treaties between Australia and the United States that would affect the recognition or enforcement of foreign judgments in Australia. We also note that investors may be able to bring an original action in an Australian court against us to enforce liabilities based in part upon U.S. federal securities laws. The disclosures in this section are not based on the opinion of counsel.

We have appointed Cogency Global Inc. as our agent to receive service of process with respect to any action brought against us under the federal securities laws of the United States.

This prospectus relates to the possible offer and resale by the Selling Holders of up to 2,069,122 of our Ordinary shares, which included 1,954,049 Loan Funded Shares. The Loan Funded Shares were issued in connection with certain Loan Agreements between us and the LFS Selling Holders or persons who nominated the LFS Selling Holders to hold such shares. See “Material Relationships with the Selling Holders—LFS Selling Holders” below for additional information. Except as described under “Material Relationships with the Selling Holders” below, the Selling Holders have not had any material relationship with us or any of our affiliates within the past three years. All Ordinary shares numbers listed in this prospectus reflect the 1-5 reverse split which was effected by the Company on November 4, 2021.

The Selling Holders may from time to time offer and sell any or all of the Ordinary shares set forth below pursuant to this prospectus. When we refer to the “Selling Holders” in this prospectus, we mean the persons listed in the table below, and the pledgees, donees, transferees, assignees, successors and others who later come to hold any of the Selling Holders’ interest in the securities of the Company listed in the table below after the date of this prospectus such that registration rights shall apply to those securities.

The following table is prepared based on information provided to us by the Selling Holders. It sets forth the name and address of the Selling Holders, the aggregate number of Ordinary shares that the Selling Holders may offer pursuant to this prospectus, and the beneficial ownership of the Selling Holders both before and after the offering. Beneficial ownership for the purposes of the following table is determined in accordance with the rules and regulations of the SEC. A person is a “beneficial owner” of a security if that person has or shares “voting power,” which includes the power to vote or to direct the voting of the security, or “investment power”, which includes the power to dispose of or to direct the disposition of the security or has the right to acquire such powers within 60 days of January 31, 2024. We have based percentage ownership prior to this offering on 97,111,112 Ordinary shares as of January 31, 2024.

Unless otherwise indicated below, the address for each beneficial owner is c/o Iris Energy Limited, Level 12, 44 Market Street, Sydney, NSW 2000, Australia.

We cannot advise you as to whether the Selling Holders will in fact sell any or all of the securities set forth in the tables below. In addition, the Selling Holders may sell, transfer or otherwise dispose of, at any time and from time to time, such securities in transactions exempt from the registration requirements of the Securities Act after the date of this prospectus. For purposes of the below tables, unless otherwise indicated below, we have assumed that the Selling Holders will have sold all of the securities covered by this prospectus upon the completion of the offering.

Pursuant to Loan Agreements, we extended credit to the relevant borrower to fund the aggregate purchase price for the Loan Funded Shares covered by this prospectus, and such Loan Funded Shares were pledged to secure the relevant borrower’s obligations under the applicable Loan Agreement. As of January 31, 2024, an aggregate of A$5.4 million of borrowings was outstanding under the Loan Agreements. Each of the Loan Agreements has a final maturity date that is 119 months following the date of issuance of the relevant Loan Funded Shares issued in connection with the applicable Loan Agreement.

The Loan Agreements entered into with employees provide that the relevant loans are required to be repaid on the final maturity date, unless an earlier repayment trigger occurs. There are repayment triggers under such Loan Agreements, including termination of the relevant individual’s employment, and any sale of the Loan Funded Shares issued in connection with such Loan Agreement. The Loan Agreements require that the shares issued in connection with the relevant Loan Agreement be sold upon the occurrence of a repayment trigger in order to fund the repayment of the applicable loan or the loan otherwise be repaid at the final maturity date.

The Loan Agreements relating to PodTech Arrangement provide that the relevant loans are required to be repaid on the final maturity date, unless an earlier repayment trigger occurs. Repayment triggers under such Loan Agreements include material breaches and defaults under the Loan Agreement or related agreements and a cessation of the individuals’ relationship as a senior stakeholder in the Company. The Loan Agreements require that the shares issued in connection with the relevant Loan Agreement be sold upon the occurrence of a repayment trigger in order to fund the repayment of the applicable loan or the loan otherwise be repaid at the final maturity date.

All the Loan Funded Shares covered by this prospectus are subject to certain transfer restrictions. The LFS Selling Holders may not transfer the Loan Funded Shares without Company approval, and shares issued under the Revised Employee Share Plan may not be transferred until three years after the date of acquisition. Unless otherwise agreed, if any shares covered by this prospectus that are subject to vesting conditions are transferred when only partially vested, the remainder of such shares will not vest and are required to be transferred back to the Company.

Each of Beomshik Shin, Kent Draper, Glenn Harrison, Jason Date, Aaron Hawkins, Gregoire Mauve, Maxim Yushchenko, Jarrett Chasse, Greg Duerksen and Peter Fry are current or former employees of the Company (including, in certain cases, PDC, which is a wholly-owned subsidiary of the Company. Gregory Leslie Roberts and Janine Maree Roberts are the parents of Daniel Roberts and William Roberts, the co-founders, co-CEOs and directors of the Company.

The following descriptions are summaries of the material terms of our Constitution. Reference is made to the more detailed provisions of the Constitution. Please note that this summary is not intended to be exhaustive. For further information please refer to the full version of our amended and restated Constitution which is included as an exhibit to this registration statement.

Iris Energy was incorporated under the laws of New South Wales, Australia on November 6, 2018, and is an Australian public company (ACN 629 842 799). Our registered address is located at c/o Pitcher Partners, Level 13, 664 Collins Street, Docklands, Victoria, Australia 3008.

We do not have a limit on our authorized share capital and do not recognize the concept of par value under Australian law.

Subject to restrictions on the issue of securities in our Constitution and the Corporations Act and any other applicable law, we may at any time issue shares and grant options or warrants on any terms, with the rights and restrictions and for the consideration that the board determine.

The rights and restrictions attaching to Ordinary shares and B Class shares are derived through a combination of our Constitution, the common law applicable to Australia, the Corporations Act and other applicable law. A general summary of some of the rights and restrictions attaching to Ordinary shares and B Class shares are summarized below. Each ordinary shareholder is entitled to receive notice of and to be present, to vote and to speak at general meetings.

Our Ordinary shares and B Class shares will have the rights and restrictions described in “Key Provisions in our Constitution”.

Our Constitution is similar in nature to the bylaws of a U.S. corporation. It does not provide for or prescribe any specific objectives or purposes for the Company. Our Constitution is subject to the terms of the Corporations Act. It may be amended or repealed and replaced by special resolution of shareholders, which is a resolution passed by at least 75% of the votes cast by shareholders (in person or by proxy) entitled to vote on the resolution.

Under Australian law, a company has the legal capacity and powers of an individual both within and outside Australia. The material provisions of our Constitution are summarized below. This summary is not intended to be complete nor to constitute a definitive statement of the rights and liabilities of our shareholders, and is qualified in its entirety by reference to the complete text of our Constitution, a copy of which is an exhibit to the registration statement of which this prospectus forms a part.

A director or that director’s alternate who has a material personal interest in a matter that is being considered at a directors’ meeting must not be present while the matter is being considered at the meeting or vote in respect of that matter according to our Constitution unless permitted to do so by the Corporations Act, in which case such director may (i) be counted in determining whether or not a quorum is present at any meeting of directors considering that contract or arrangement or proposed contract or arrangement; (ii) sign or countersign any document relating to that contract or arrangement or proposed contract or arrangement; and (iii) vote in respect of, or in respect of any matter arising out of, the contract or arrangement or proposed contract or arrangement.

Unless a relevant exception applies, the Corporations Act requires our directors to provide disclosure of any material personal interest, and prohibits directors from voting on matters in which they have a material personal interest and from being present at the meeting while the matter is being considered, unless directors who do not have a material personal interest in the relevant matter have passed a resolution that identifies the director, the

nature and extent of the director’s interest in the matter and its relation to our affairs and states that those directors are satisfied that the interest should not disqualify the director from voting or being present. In addition, the Corporations Act may require shareholder approval of any provision of related party benefits to our directors, unless a relevant exception applies.

Pursuant to our Constitution, the management and control of our business affairs are vested in our board of directors. Our board has the power to raise or borrow money or obtain other financial accommodation for the purposes of the Company, and may grant security for the repayment of that sum or sums or the payment, performance or fulfilment of any debts, liabilities, contracts or obligations incurred or undertaken by the Company in any manner and upon any terms and conditions as our board deems appropriate.

Under the Constitution, the minimum number of directors that may comprise the board is 3 and the maximum is fixed by the directors but may not be more than 10 (unless otherwise determined by the board of directors). Directors are elected at annual general meetings of the Company. The directors may also appoint a Director to fill a casual vacancy on the Board or in addition to the existing directors, who will then hold office until the next annual general meeting of the Company.

The rights attaching to our Ordinary shares are detailed in our Constitution. Our Constitution provides that, subject to the Corporations Act and our Constitution, our directors may issue shares with preferential, deferred or special rights, privileges or conditions or with any restrictions, whether in relation to dividends, voting, return of share capital, or otherwise as our board of directors may determine. Subject to the Corporations Act and our Constitution (see “Anti-Takeover Effects of Certain Provisions of Our Constitution”), we may issue further shares on such terms and conditions as our board of directors resolve.

We may only issue preference shares if the rights attaching to the preference shares relating to repayment of capital, participation in surplus assets and profits, cumulative and non-cumulative dividends, voting and priority of payment of capital and dividends in respect of other shares (including Ordinary shares) are set out in our constitution or otherwise approved by special resolution passed at a general meeting.

Under the Corporations Act, a company must not pay a dividend unless (a) the company’s assets exceed its liabilities immediately before the dividend is declared and the excess is sufficient for the payment of the dividend; (b) the payment of the dividend is fair and reasonable to the company’s shareholders as a whole; and (c) the payment of the dividend does not materially prejudice the company’s ability to pay its creditors. Subject to this requirement, our board may from time to time determine to pay and declare dividends to shareholders in accordance with the respective rights and restrictions attached to any share or class of share. Each B Class share does not confer on its holder any right to receive dividends.

All dividends unclaimed for one year after the time for payment has passed may be invested or otherwise made use of by our board for our benefit until claimed or until dealt with under any law relating to unclaimed moneys.

Voting rights at a general meeting of the Company’s shareholders will be determined by poll (rather than a show of hands).

On a poll, holders of Ordinary shares are entitled to one vote for each Ordinary share held and a fraction of a vote for each partly paid share held by the shareholder and in respect.

The holders of B Class shares are entitled to vote at general meetings of shareholders. Each B Class shareholder is entitled on a poll, to 15 votes for each Ordinary share held by the holder of a B Class share.

In the case of joint holders of a share, the vote of the joint holder whose name appears first on the register of shareholders in respect of the joint holding shall be accepted to the exclusion of the votes of the other joint holders.

In accordance with the Corporations Act and the provisions of our Constitution, the circumstances in which holders of a class of shares, including holders of Ordinary shares, will be entitled to vote separately as a single class are limited to:

Pursuant to our Constitution, our shareholders are entitled to participate in our profits only by payment of dividends in accordance with the respective rights and restrictions attached to any share or class of share. Our board may from time to time determine to pay dividends to the shareholders. However, any such dividend may only be payable in accordance with the requirements set out in the Corporations Act described above.

If the Company is wound up, then subject to any rights or restrictions attached to a class of shares, any surplus must be divided among the Company’s shareholders in the proportions which the amount paid and payable (including amounts credited) on the shares of a shareholder is of the total amount paid and payable (including amounts credited) on the shares of all shareholders of the Company.

B Class shares shall not confer on their holders any right to participate pro rata in any distribution of profits and assets of, and any proceeds received by, the company in excess of the total amount of capital paid-up by the holders upon issue of such B Class share

There are no redemption provisions in our Constitution in relation to Ordinary shares. Under our Constitution, shares may be issued and allotted, which are liable to be redeemed.

B Class shares will be redeemed by the Company for A$1.00 per B Class share in accordance with the Constitution upon the earlier to occur of the following circumstances:

The redemption of B Class shares, whether voluntary or upon a transfer of B Class shares, may have the effect, over time, of increasing the relative voting power of those holders of B Class shares who retain their B Class shares. Under the Corporations Act, redeemable preference shares may only be redeemed if those preference shares are fully paid-up and payment in satisfaction of redemption is out of profits or the proceeds of a new issue of shares made for the purposes of the redemption.

Subject to the Corporations Act and the terms of issue of a class of shares, the rights attaching to any class of shares may be varied or cancelled with the approval of the Board and: (a) the consent in writing of the holders of three-quarters of the issued shares included in that class; or (b) by a special resolution passed at a separate meeting of the holders of those shares.

General meetings of shareholders may be called by our board of directors. Except as permitted under the Corporations Act, shareholders may not convene a meeting. The Corporations Act requires the directors to call and arrange to hold a general meeting on the request of shareholders with at least 5% of the votes that may be cast at a general meeting. Notice of the proposed meeting of our shareholders is required at least 21 days prior to such meeting under the Corporations Act.

Our Constitution does not impose specific limitations on the rights of non-residents to own securities. However, acquisitions and proposed acquisitions of securities in Australian companies may be subject to review and approval by the Australian Federal Treasurer under the Foreign Acquisitions and Takeovers Act 1975 (Cth), or the FATA, which generally applies to acquisitions or proposed acquisitions:

In general terms, for proposals for investment in non-sensitive sectors, no such review or approval under the FATA is required if the foreign acquirer is a U.S. entity and the value of the Australian target is less than A$1,427 million. A lower general A$330 million threshold applies to most other foreign investors.

The Australian Federal Treasurer may prevent a proposed acquisition in the above categories or impose conditions on such acquisition if the Australian Federal Treasurer is satisfied that the acquisition would be contrary to the national interest. If a foreign person acquires shares or an interest in shares in an Australian company in contravention of the FATA, the Australian Federal Treasurer has the power to make a range of orders including an order of the divestiture of such person’s shares or interest in shares in that Australian company.

Subject to the Constitution, shares may be transferred by a proper transfer effected in accordance with the Nasdaq listing rules, by a written instrument of transfer which complies with the Constitution or by any other method permitted by the Corporations Act. The board may refuse to register a transfer of shares where permitted or required to do so under the Corporations Act or Nasdaq listing rules. B Class shares are not transferable by the holder (other than to an affiliate of that holder).

Subject to our Constitution, the Corporations Act and any other applicable law, we may at any time issue shares and give any person a call or option over any shares on any terms, with preferential, deferred or other special rights, privileges or conditions or with restrictions and for the consideration and other terms that the directors determine. We may only issue preference shares if the rights attaching to the preference shares relating to repayment of capital, participation in surplus assets and profits, cumulative and non-cumulative dividends, voting and priority of payment of capital and dividends in respect of other shares (including Ordinary shares) are set out in our Constitution or otherwise approved by special resolution passed at a general meeting of shareholders.

Subject to the requirements of our Constitution, the Corporations Act and any other applicable law, including relevant shareholder approvals, we may consolidate or divide our share capital into a larger or smaller number by resolution, reduce our share capital in any manner (provided that the reduction is fair and reasonable to our shareholders as a whole, does not materially prejudice our ability to pay creditors and obtains the necessary shareholder approval) or buy back our Ordinary shares whether under an equal access buy-back or on a selective basis.

Our Constitution contains provisions for shareholder approval to be required in relation to any proportional takeover bid. These provisions will cease to apply unless renewed by special resolution of the shareholders in general meeting by the third anniversary of the date of the Constitution’s adoption.

The Constitution can only be amended by special resolution passed by at least three-quarters of the votes cast by shareholders present (in person or by proxy) and entitled to vote on the resolution at a general meeting of the Company. The Company must give at least 21 days’ written notice of a general meeting of the Company.

Takeovers of Australian public companies that have more than 50 shareholders are regulated by, amongst other things, the Corporations Act which prohibits the acquisition of a relevant interest in issued voting shares in a public company if the acquisition will lead to that person’s or someone else’s voting power in the company increasing from 20% or below to more than 20% or increasing from a starting point that is above 20% and below 90%, which we refer to as the Takeover Prohibition, subject to a range of exceptions. Generally, and without limitation, a person will have a “relevant interest” in securities if they:

If at a particular time a person has a relevant interest in issued securities and the person (whether before or after acquiring the relevant interest):

There are a number of exceptions to the Takeover Prohibition. In general terms, some of the more significant exceptions include:

Certain breaches of the takeovers provisions of the Corporations Act may give rise to criminal offences. The Australian Securities and Investments Commission and the Australian Takeover Panel have a wide range of powers relating to breaches of takeover provisions including the ability to make orders canceling contracts, freezing transfers of, and rights attached to, securities, and forcing a party to dispose of securities. There are certain defenses to breaches of the takeovers provisions provided in the Corporations Act.

Set forth below is a comparison of certain shareholder rights and corporate governance matters under Delaware law and Australian law:

The transfer agent and registrar for our Ordinary shares is Computershare Trust Company, N.A. The transfer agent and registrar’s address is 150 Royal Street, Canton, MA 02021.

Our Ordinary shares are listed on the Nasdaq Global Select Market under the symbol “IREN”.

The following discussion describes the material U.S. federal income tax consequences to U.S. Holders (as defined below) of an investment in our Ordinary shares. This summary applies only to U.S. Holders that acquire our Ordinary shares in exchange for cash, hold our Ordinary shares as capital assets within the meaning of Section 1221 of the Code (as defined below) and have the U.S. dollar as their functional currency.

This discussion is based on the tax laws of the United States as in effect on the date of this prospectus, including the Internal Revenue Code of 1986, as amended (the “Code”), and U.S. Treasury regulations in effect or, in some cases, proposed, as of the date of this prospectus, as well as judicial and administrative interpretations thereof available on or before such date. All of the preceding authorities are subject to change, and any such change could apply retroactively and affect the U.S. federal income tax consequences described below. The statements in this prospectus are not binding on the U.S. Internal Revenue Service (the “IRS”) or any court. Thus, the Company can provide no assurance that the U.S. federal income tax consequences discussed below will not be challenged by the IRS or will be sustained by a court if challenged by the IRS. Furthermore, this summary does not address any estate or gift tax consequences, state, local or non-U.S. tax consequences, or other tax consequences other than U.S. federal income tax consequences.

The following discussion does not describe all the tax consequences that may be relevant to any particular investor or to persons in special tax situations such as:

PROSPECTIVE PURCHASERS ARE URGED TO CONSULT THEIR TAX ADVISERS ABOUT THE APPLICATION OF THE U.S. FEDERAL TAX RULES TO THEIR PARTICULAR CIRCUMSTANCES AS WELL AS THE STATE, LOCAL AND NON-U.S. TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR ORDINARY SHARES.

As used herein, the term “U.S. Holder” means a person eligible for the benefits of the tax treaty between the United States and Australia (the “Treaty”) that is, for U.S. federal income tax purposes, a beneficial owner of our Ordinary shares and is or is treated as:

The tax treatment of a partner in an entity or arrangement treated as a partnership for U.S. federal income tax purposes that holds our Ordinary shares generally will depend on such partner’s status and the partnership’s activities. Accordingly, a U.S. Holder that is a partner in such a partnership should consult its tax adviser.

Treasury regulations that apply to taxable years beginning on or after December 28, 2021 (the “Foreign Tax Credit Regulations”) may in some circumstances prohibit a U.S. person from claiming a foreign tax credit with respect to certain non-U.S. taxes that are not creditable under applicable income tax treaties. However, the IRS released guidance in the form of notices which provide temporary relief from the requirements of these new regulations for taxable years ending before the date that a notice or other guidance withdrawing or modifying the temporary relief is issued (or any later date specified in such notice or other guidance). The rules governing the calculation and timing of foreign tax credits and the deduction of foreign taxes are complex and depend upon a U.S. Holder’s particular circumstances. Accordingly, U.S. investors that are not eligible for Treaty benefits should consult their tax advisers regarding the creditability or deductibility of any Australian taxes imposed on dividends on, or dispositions of, the Ordinary shares. This discussion does not apply to investors in this special situation.

Subject to the passive foreign investment company considerations discussed below, the gross amount of distributions made by the Company with respect to our Ordinary shares (including the amount of any non-U.S. taxes withheld therefrom) generally will be includible as dividend income in a U.S. Holder’s gross income in the year received, to the extent such distributions are paid out of the Company’s current or accumulated earnings and profits, as determined under U.S. federal income tax principles. Because the Company does not maintain its earnings and profits calculations under U.S. federal income tax principles, a U.S. Holder should expect all cash distributions to be reported as dividends for U.S. federal income tax purposes. Such dividends will not be eligible for the dividends-received deduction allowed to U.S. corporations with respect to dividends received from other U.S. corporations. Dividends received by non-corporate U.S. Holders may be “qualified dividend income,” which is taxed at the lower applicable capital gains rate, provided that (1) the Company is eligible for the Treaty benefits or our Ordinary shares are readily tradable on an established securities market in the United States, (2) the Company is not a passive foreign investment company (as discussed below) for either the taxable year in which the dividend was paid or the preceding taxable year, (3) the U.S. Holder satisfies specific holding period requirements and (4) the U.S. Holder is not under an obligation to make related payments with respect to positions in substantially similar or related property. U.S. Holders should consult their tax advisers regarding the availability of the lower rate for dividends paid with respect to our Ordinary shares.

The amount of any distribution paid in a foreign currency will be equal to the U.S. dollar value of such currency, translated at the spot rate of exchange on the date such distribution is received, regardless of whether the payment is in fact converted into U.S. dollars at that time. If the dividend is converted into U.S. dollars on the date of receipt, a U.S. Holder should not be required to recognize foreign currency gain or loss in respect of the dividend income. A U.S. Holder may have foreign currency gain or loss if the dividend is converted into U.S. dollars after the date of receipt. In general, foreign currency gain or loss will be treated as U.S.-source ordinary income or loss.

Dividends on our Ordinary shares generally will constitute foreign source income for foreign tax credit limitation purposes. Subject to certain complex conditions and limitations, any Australian taxes withheld on any distributions on our Ordinary shares may be eligible for credit against a U.S. Holder’s federal income tax liability or, at such holder’s election, may be eligible as a deduction in computing such holder’s U.S. federal taxable income. If a refund of the tax withheld is available under the laws of Australia or under the Treaty, the amount of tax withheld that is refundable will not be eligible for such credit against a U.S. Holder’s U.S. federal income tax liability (and will not qualify for the deduction against U.S. federal taxable income). If the dividends constitute qualified dividend income as discussed above, the amount of the dividend taken into account for purposes of calculating the foreign tax credit limitation will generally be limited to the gross amount of the dividend, multiplied by the reduced rate applicable to the qualified dividend income, divided by the highest rate of tax normally applicable to dividends. The limitation on foreign taxes eligible for the credit is calculated

separately concerning specific classes of income. For this purpose, dividends distributed by the Company with respect to our Ordinary shares will generally constitute “passive category income.” The rules relating to the determination of the U.S. foreign tax credit are complex, and U.S. Holders should consult their tax advisers regarding the availability of a foreign tax credit in their particular circumstances and the possibility of claiming an itemized deduction (in lieu of the foreign tax credit) for any foreign taxes paid or withheld.

Subject to the passive foreign investment company considerations discussed below, upon a sale or other taxable disposition of our Ordinary shares, a U.S. Holder will recognize capital gain or loss in an amount equal to the difference between the amount realized and the U.S. Holder’s adjusted tax basis in such Ordinary shares. A U.S. Holder’s initial tax basis in our Ordinary shares generally will equal the cost of such Ordinary shares. Generally, any such gain or loss will be treated as long-term capital gain or loss if the U.S. Holder’s holding period in our Ordinary shares exceeds one year. Non-corporate U.S. Holders (including individuals) generally will be subject to U.S. federal income tax on long-term capital gain at preferential rates. The deductibility of capital losses is subject to significant limitations.

Gain or loss, if any, realized by a U.S. Holder on the sale or other disposition of our Ordinary shares generally will be treated as U.S. source gain or loss for U.S. foreign tax credit limitation purposes. The use of U.S. foreign tax credits relating to any Australian tax imposed upon the sale or other disposition of our Ordinary shares may be unavailable or limited. U.S. Holders should consult their tax advisers regarding the tax consequences if Australian taxes are imposed on or connected with a sale or other disposition of our Ordinary shares and their ability to credit any Australian tax against their U.S. federal income tax liability.

The Company will be classified as a passive foreign investment company (a “PFIC”) for any taxable year if either: (a) at least 75% of its gross income is “passive income” for purposes of the PFIC rules or (b) at least 50% of the value of its assets (determined on the basis of a quarterly average) is attributable to assets that produce or are held for the production of passive income. For this purpose, passive income includes interest, dividends and other investment income, with certain exceptions. Cash and cash-equivalents generally are passive assets for these purposes, and digital assets are likely to be passive assets for these purposes as well. Goodwill is active to the extent attributable to activities that produce or are intended to produce active income. The PFIC rules also contain a look-through rule whereby the Company will be treated as owning its proportionate share of the gross assets and earning its proportionate share of the gross income of any other corporation in which it owns, directly or indirectly, 25% or more (by value) of the stock.

Under the PFIC rules, if the Company were considered a PFIC at any time that a U.S. Holder holds our Ordinary shares, the Company would continue to be treated as a PFIC with respect to such investment unless (i) the Company ceases to be a PFIC and (ii) the U.S. Holder made a “deemed sale” election under the PFIC rules.

Based on the current and anticipated composition of the income, assets, and operations of the Company and the expected price of our Ordinary shares, the Company does not expect to be treated as a PFIC for its taxable year. However, whether the Company is treated as a PFIC is a factual determination made on an annual basis after the close of each taxable year. This determination will depend on, among other things, the ownership and the composition of the Company’s income and assets, as well as the relative value of the Company’s assets (which may fluctuate with the Company’s market capitalization), at the relevant time. Under circumstances where our cash is not deployed for active purposes, our risk of being a PFIC may increase. Fluctuations in the Company’s market capitalization can also affect our PFIC status because the value of our assets for purposes of the asset test, including the value of our goodwill and unbooked intangibles, may be determined by reference to the market capitalization from time to time (which has been, and may continue to be, volatile). In particular, there is a risk that we may be a PFIC in the current and subsequent taxable years if there is a decline in the market capitalization and the value of our goodwill is determined by reference to our market capitalization. Moreover, the application of the PFIC rules to digital assets and transactions related thereto is subject to uncertainty.

Among other things, the IRS has issued limited guidance on the treatment of income from mining digital assets. The IRS or a court may disagree with the Company’s determinations, including how the Company determines the value of the Company’s assets and the percentage of the Company’s assets that are passive assets under the PFIC rules. Therefore, there can be no assurance that the Company will not be classified as a PFIC for

the current taxable year or for any future taxable year. If the Company is considered a PFIC at any time that a U.S. Holder holds our Ordinary shares, any gain recognized by the U.S. Holder on a sale or other disposition of our Ordinary shares, as well as the amount of any “excess distribution” (defined below) received by the U.S. Holder, would be allocated ratably over the U.S. Holder’s holding period for our Ordinary shares. The amounts allocated to the taxable year of the sale or other disposition (or the taxable year of receipt, in the case of an excess distribution) and to any year before the Company became a PFIC would be taxed as ordinary income. The amount allocated to each other taxable year would be subject to tax at the highest rate in effect for individuals or corporations, as appropriate, for that taxable year, and an interest charge would be imposed. For the purposes of these rules, an excess distribution is the amount by which any distribution received by a U.S. Holder on our Ordinary shares exceeds 125% of the average of the annual distributions on our Ordinary shares received during the preceding three years or the U.S. Holder’s holding period, whichever is shorter. Certain elections may be available that would result in alternative treatments (such as mark-to-market treatment) of our Ordinary shares if the Company is considered a PFIC. Special rules apply for calculating the amount of the foreign tax credit with respect to excess distributions by a PFIC.

If the Company is considered a PFIC, a U.S. Holder will also be subject to annual information reporting requirements. U.S. Holders should consult their tax advisers about the potential application of the PFIC rules to an investment in our Ordinary shares

Dividend payments with respect to our Ordinary shares and proceeds from the sale, exchange, or redemption of our Ordinary shares may be subject to information reporting to the IRS and U.S. backup withholding. A U.S. Holder may be eligible for an exemption from backup withholding if the U.S. Holder furnishes a correct taxpayer identification number and makes any other required certification or is otherwise exempt from backup withholding. U.S. Holders who are required to establish their exempt status may be required to provide such certification on IRS Form W-9. U.S. Holders should consult their tax advisers regarding applying the U.S. information reporting and backup withholding rules.

Backup withholding is not an additional tax. Amounts withheld as backup withholding may be credited against a U.S. Holder’s U.S. federal income tax liability, and such U.S. Holder may obtain a refund of any excess amounts withheld under the backup withholding rules by timely filing an appropriate claim for refund with the IRS and furnishing any required information.

Certain U.S. Holders who are individuals (and certain entities) that hold an interest in “specified foreign financial assets” (which may include our Ordinary shares) are required to report information relating to such assets, subject to certain exceptions (including an exception for our Ordinary shares held in accounts maintained by certain financial institutions). Penalties can apply if U.S. Holders fail to satisfy such reporting requirements. U.S. Holders should consult their tax advisers regarding the applicability of these requirements to their acquisition and ownership of our Ordinary shares.

THE DISCUSSION ABOVE IS A GENERAL SUMMARY. IT DOES NOT COVER ALL TAX MATTERS THAT MAY BE IMPORTANT TO YOU. EACH PROSPECTIVE PURCHASER SHOULD CONSULT ITS OWN TAX ADVISER ABOUT THE TAX CONSEQUENCES OF AN INVESTMENT IN OUR ORDINARY SHARES UNDER ITS CIRCUMSTANCES.

In this section, we provide a general summary of the material Australian income tax, stamp duty, and goods and services tax considerations generally applicable to the acquisition, ownership, and disposal by the absolute beneficial owners of the Ordinary shares issued by Iris Energy.

This section is based upon existing Australian tax law as of the date of this prospectus, which is subject to change, possibly retrospectively. This discussion does not address all aspects of Australian tax law, which may be important to particular investors in light of their investment circumstances, such as shares held by investors subject to special tax rules (for example, financial institutions, insurance companies, or tax-exempt organizations).

It does not purport to address all possible tax situations that may be relevant to a decision to purchase, own, or deposit our Ordinary shares. It is included herein solely for preliminary information purposes and is not intended to be, nor should it be construed to be, legal or tax advice. Iris Energy and their officers, employees, taxation or other advisers do not accept any liability or responsibility in respect of any statement concerning taxation consequences or the taxation consequences.

Prospective purchasers of our Ordinary shares should consult their tax advisers on the applicable tax consequences related to the ownership of our Ordinary shares, based on their particular circumstances.

The comments in this section deal only with the Australian taxation implications of the ownership and disposition of Iris Energy Ordinary shares if you hold your Iris Energy Ordinary shares as investments on a capital account. In addition, this summary does not discuss any non-Australian or state tax considerations, other than stamp duty and goods and services tax.

For this summary, a holder of our Ordinary shares that is not an Australian tax resident and is not carrying on business in Australia at or through a permanent establishment is referred to as a “Non-Australian Holder.”

Conversely, for the purposes of this summary, a holder that is an Australian tax resident or is carrying on business in Australia at or through a permanent establishment is referred to as an “Australian Resident Holder.”

Please be aware that the residence concept used in this section applies for Australian tax assessment purposes only. Any reference in this section to a tax, duty, levy impost, or other charge or withholding of a similar nature refers to Australia’s tax laws and/or concepts only. Also, please note that a reference to Australian income tax encompasses corporate income tax and personal income tax generally.

As the Company is a fully taxable Australian company, its taxable income is subject to corporate income tax in Australia. All Australian companies are subject to a corporate income tax rate of 30%, other than those classified as a “base rate company”, which are businesses with revenue of less than A$50 million that are subject to a reduced corporate income tax rate of 25% for the 2021/2022 income year. The Company is not considered a base rate company for the year ended June 30, 2023.

Dividends paid by us on our Ordinary shares should constitute the assessable income of an Australian Resident Holder. Australia operates a dividend imputation system under which dividends may be declared to be “franked” to the extent they are paid out of company profits that have been subject to income tax.

Australian Resident Holders who are individuals or complying superannuation entities should include the dividend in their assessable income in the year the dividend is paid, together with any franking credit attached to that dividend. Subject to the comments concerning ‘Qualified Persons’ below, such Australian Resident Holders should be entitled to a tax offset equal to the franking credit attached to the dividend.

The tax offset can be applied to reduce the tax payable on the investor’s taxable income. Where the tax offset exceeds the tax payable on the investor’s taxable income, the investor should be entitled to a tax refund equal to the excess. To the extent that the dividend is unfranked, an Australian individual Shareholder will generally be taxed at their prevailing marginal rate on the dividend received (with no tax offset). Complying Australian superannuation entities will generally be taxed at the prevailing rate for complying superannuation entities on the dividend received (with no tax offset).

Australian Resident Holders that are companies are also required to include both the dividend and the associated franking credits (if any) in their assessable income.

Subject to the comments in relation to ‘Qualified Persons’ below, such companies should be entitled to a tax offset up to the amount of the franking credit attached to the dividend. Likewise, the company should generally be entitled to a credit in its own franking account to the extent of the franking credits attached to the distribution received. This will allow the Australian Resident Holders that are companies to pass on the franking credits to its investor(s) on the subsequent payment of franked dividends.

Excess franking credits received by the company shareholder will not give rise to a refund entitlement for a company but may be converted into carry forward tax losses instead. This is subject to specific rules on how the carry forward tax loss is calculated and utilized in future years. For completeness, this tax loss cannot be carried back under the loss carry back tax offset rules introduced in the 2020-21 Federal Budget.

Australian Resident Holders who are trustees (other than trustees of complying superannuation entities, which are dealt with above) or partnerships are also required to include any dividends and any franking credits in calculating the net income of the trust or partnership. Where a fully franked or partially franked dividend is received, the relevant beneficiary or partner may be entitled to a tax offset in respect of any franking credits distributed to the relevant beneficiary or partner as applicable.

To the extent that the dividend is unfranked, an Australian trustee (other than trustees of complying superannuation entities) or partnerships, will be required to include the unfranked dividend in the net income of the trust or partnership. The relevant beneficiary will be taxed at the relevant prevailing tax rate on their share of the net income of the trust or partnership (with no tax offset).

The benefit of franking credits can be denied where an Australian Resident Holder is not a ‘qualified person’ in which case the Holder will not be required to include an amount for the franking credits in their assessable income nor will they be entitled to a tax offset.

Broadly, to be a qualified person, a shareholder must satisfy the holding period rule and, if necessary, the related payment rule. The holding period rule requires a shareholder to hold the shares ‘at risk’ for at least 45 days continuously during the qualification period - starting from the day after acquiring the shares and ending 45 days after the shares become ex-dividend - in order to qualify for franking benefits.

This holding period rule is subject to certain exceptions, including where the total franking offsets of an individual in a year of income do not exceed A$5,000.

Whether you are qualified person is a complex tax issue which requires analysis based on each shareholder’s individual circumstances. Iris Energy ordinary shareholders should obtain their own tax advice to determine if these requirements have been satisfied.

For Australian Resident Holders, who hold their Ordinary shares on capital account, the future disposal of Ordinary shares will give rise to a CGT event at the time which the legal and beneficial ownership of the Ordinary shares are disposed of. Australian Resident Holders will derive a capital gain on the disposal of their Ordinary shares in Iris Energy to the extent that the capital proceeds exceed the cost base of their Ordinary shares.

A capital loss will be made where the capital proceeds are less than the cost base of their Ordinary shares. Where a capital loss is made, capital losses can only be offset against capital gains derived in the same or later incomes years. They cannot be offset against ordinary income nor carried back to offset net capital gains arising in earlier income years. Capital losses may be carried forward to future income years subject to the satisfaction of the Australian loss testing provisions.

The capital proceeds should generally be equal to any consideration received by the Australian Resident Holder in respect to the disposal of their Iris Energy Ordinary share/s.

The cost base of an Ordinary share should generally be equal to the cost of acquiring the Ordinary share, holding the Ordinary share, plus any incidental costs of acquisition and disposal (e.g. brokerage costs and legal fees).

The CGT discount may apply to Australian Resident Holders that are individuals complying Australian superannuation funds or trusts, who have held, or are taken to have held, their Ordinary shares for at least 12 months (not including the date of acquisition or date of disposal) at the time of the disposal of their Ordinary shares.

The CGT discount is:

One-half if the Australian Resident Holder is an individual or trustee: meaning generally only 50% of the capital gain will be included in the Australian Resident Holder’s assessable income; and

One-third if the Australian Resident Holder is a trustee of a complying superannuation entity: meaning generally only two-thirds of the capital gain will be included in the Australian Resident Holder’s assessable income.

The CGT discount is not available to Australian Resident Holders that are companies. If an Australian Resident Holder makes a discounted capital gain, any current year and/or carried-forward capital losses will be applied to reduce the undiscounted capital gain before the relevant CGT discount is applied. The resulting amount forms the Australian Resident Holder’s net capital gain for the income year and is included in its assessable income.

The CGT discount rules relating to trusts are complex. Subject to certain requirements being satisfied, the capital gain may flow through to the beneficiaries in that trust, who will assess the eligibility for the CGT discount in their own right. Accordingly, we recommend trustees seek their own independent advice on how the CGT discount applies to the trust and its beneficiaries.

Non-Australian Holders who do not have a permanent establishment in Australia should not be subject to Australian income tax but may be subject to Australian dividend withholding tax on their Iris Energy dividends.

As outlined above, Australia has a franking system wherein dividends can be franked, and Australian resident shareholders receive a franking credit which effectively represents the corporate tax paid by the underlying company (i.e. Iris Energy).

Dividends received by Non-Australian Holders which are franked should not be subject to Australian dividend withholding tax to the extent of the franking (i.e. if the dividend is fully franked, it should not be subject to Australian dividend withholding tax at all). However, refunds of franking credits are not available to non-Australian resident shareholders.

Non-Australian Holders should not be subject to Australian dividend withholding tax on unfranked dividends to the extent that the dividend is declared to be conduit foreign income (CFI).

CFI generally includes amounts received by Iris Energy that have been derived from a non-Australian source, for example dividends received from foreign subsidiaries which are treated as non-assessable non-exempt income for Australian tax purposes.

Non-Australian Holders should generally be subject to Australian dividend withholding tax to the extent the unfranked component of any dividends are not declared to by CFI. Australian dividend withholding tax will be imposed at 30% of the amount of the unfranked dividend, unless a shareholder is a resident of a country with

which Australia has a double taxation treaty (DTT) and qualifies for the benefits of the treaty. In the event the Non-Australian Holder is otherwise able to rely on a DTT with Australia, the rate of Australian dividend withholding tax may be reduced (typically to 15%), depending on the terms of the DTT.

Under the provisions of the current Double Taxation Convention between Australia and the United States, the Australian tax withheld on unfranked dividends that are not declared to be CFI paid by us to a resident of the United States is beneficially entitled is limited to 15%.

Under the Double Taxation Convention between Australia and the United States, if a company that is a Non-Australian Holder directly owns a 10% or more interest in an Australian company (i.e. Iris Energy), the Australian tax withheld on unfranked dividends that are not declared to be CFI paid by us to which a resident of the United States is beneficially entitled is limited to 5%.

Non-Australian Holders who are treated as the owners of the underlying shares on the basis that they are absolutely entitled to those Ordinary shares will not be subject to Australian capital gains tax on the gain made on a sale or other disposal of Ordinary shares unless:

Australian capital gains tax applies to net capital gains at a taxpayer’s marginal tax rates. Net capital gains are calculated after reduction for capital losses, which may only be offset against capital gains.

The capital gains tax discount is not available to Non-Australian Holders on gains in respect of Iris Energy Ordinary shares, where they were non-Australian residents during the entire holding period. Where Non-Australian Holders were Australian tax residents for some of the holding period, the capital gains tax discount percentage is reduced to account for the period of foreign residency during the entire holding period. Companies are not entitled to a capital gains tax discount.

Broadly, where there is a disposal of certain taxable Australian property by a Non-Australian Holder, the purchaser will be required to withhold and remit to the Australian Taxation Office, or the ATO, 12.5% of the proceeds from the sale. A transaction is excluded from the withholding requirements in certain circumstances, including where the transaction is an on-market transaction conducted on an approved stock exchange, a securities lending, or the transaction is conducted using a broker operated crossing system. There may also be an exception to the requirement to withhold where a Non-Australian Holder provides a declaration that their Ordinary shares are not ‘indirect Australian real property interests’. The Non-Australian Holder may be entitled to receive a tax credit for the tax withheld by the purchaser which they may claim in their Australian income tax return.

If a holder of Ordinary shares is a resident of both Australia and the United States under those countries’ domestic taxation laws, that holder may be subject to tax as an Australian resident.

The below comments apply to both Australian Resident Holders and Non-Australian Holders.

No Australian stamp duty is payable on the issue, transfer and/or surrender of the Ordinary shares, on the basis that Iris Energy is admitted to the official list of Nasdaq and all of its shares (and all shares of any other class of shares) are and remain quoted on that exchange and the issue/transfer/surrender of Ordinary shares does

not result in a person, whether alone or together with associated/related persons or with otherwise unassociated persons as part of substantially one arrangement or acting in concert with other persons, having a 90% or more interest in Iris Energy (by reference to their entitlement to a distribution of property of Iris Energy on a winding up or otherwise).

No Australian GST will be payable on the supply of the Ordinary shares.

Subject to certain requirements, there may be a restriction on the entitlement of Iris Energy ordinary shareholders to claim an input tax credit for any GST incurred on costs associated with the acquisition or disposal of Iris Energy Ordinary shares (e.g. lawyer’s and accountants’ fees).

THE DISCUSSION ABOVE IS A SUMMARY OF THE AUSTRALIAN TAX CONSEQUENCES OF AN INVESTMENT IN OUR ORDINARY SHARES AND IS BASED UPON LAWS AND RELEVANT INTERPRETATIONS THEREOF IN EFFECT AS OF THE DATE OF THIS PROSPECTUS, ALL OF WHICH ARE SUBJECT TO CHANGE, POSSIBLY WITH RETROACTIVE EFFECT. EACH PROSPECTIVE INVESTOR IS URGED TO CONSULT ITS OWN TAX ADVISOR.

Each Selling Holder of the securities and any of their pledgees, donees, assignees, transferees, and successors-in-interest may, from time to time, sell any or all of their securities or interests in any securities covered hereby on the Nasdaq Stock Market LLC or any other stock exchange, market or trading facility on which the securities are traded or in private transactions. These sales or dispositions may be at fixed or negotiated prices. A Selling Holder may use any one or more of the following methods when selling securities:

The Selling Holders may also sell securities under Rule 144 or any other exemptions from registration under the Securities Act of 1933, as amended (the “Securities Act”), if available, rather than under this prospectus.

Broker-dealers engaged by the Selling Holders may arrange for other broker-dealers to participate in sales. Broker-dealers may receive commissions or discounts from the Selling Holders (or, if any broker-dealer acts as agent for the purchaser of securities, from the purchaser) in amounts to be negotiated, but, except as set forth in a supplement to this prospectus, in the case of an agency transaction not in excess of a customary brokerage commission in compliance with Financial Industry Regulatory Authority, Inc. (“FINRA”) Rule 2121; and in the case of a principal transaction a markup or markdown in compliance with FINRA Rule 2121.

In connection with the sale of the securities or interests therein, the Selling Holders may enter into hedging transactions with broker-dealers or other financial institutions, which may in turn engage in short sales of the securities in the course of hedging the positions they assume. The Selling Holders may also sell securities short and deliver these securities to close out their short positions, or loan or pledge the securities to broker-dealers that in turn may sell these securities. The Selling Holders may also enter into option or other transactions with broker-dealers or other financial institutions or create one or more derivative securities which require the delivery to such broker-dealer or other financial institution of securities offered by this prospectus, which securities such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction).

The Selling Holders and any broker-dealers or agents that are involved in selling the securities may be deemed to be “underwriters” within the meaning of the Securities Act in connection with such sales. In such event, any commissions received by such broker-dealers or agents and any profit on the resale of the securities purchased by them may be deemed to be underwriting commissions or discounts under the Securities Act.

We are required to pay certain fees and expenses incurred by us incident to the registration of the securities. The Company may also agree to reimburse certain Selling Holders for all or a portion of any underwriting fees, discounts and selling commissions incurred by such Selling Holders in connection with any sale of their Ordinary shares offered by such Selling Holders pursuant to this prospectus.

Selling Holders will be subject to the prospectus delivery requirements of the Securities Act, including Rule 172 thereunder. In addition, any securities covered by this prospectus which qualify for sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144 rather than under this prospectus or any other exemptions from registration under the Securities Act.

We expect to keep this prospectus effective until the date on which all securities are sold or the date on which the shares may be immediately sold to the public without registration or restriction pursuant to Rule 144 under the Securities Act. The resale securities will be sold only through registered or licensed brokers or dealers if required under applicable state securities laws. In addition, in certain states, the resale securities covered hereby may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with.

Under applicable rules and regulations under the Exchange Act, any person engaged in the distribution of the resale securities may not simultaneously engage in market making activities with respect to the common stock for the applicable restricted period, as defined in Regulation M, prior to the commencement of the distribution. In addition, the Selling Holders will be subject to applicable provisions of the Exchange Act and the rules and regulations thereunder, including Regulation M, which may limit the timing of purchases and sales of securities of the common stock by the Selling Holders or any other person. We will make copies of this prospectus available to the Selling Holders and have informed them of the need to deliver a copy of this prospectus to each purchaser at or prior to the time of the sale (including by compliance with Rule 172 under the Securities Act).

Set forth below is an itemization of the total expenses (excluding the underwriting discounts and commissions), which are expected to be incurred in connection with this offering:

The validity of certain securities and certain other matters with respect to Australian law have been passed upon for us by Clifford Chance LLP, located at Level 24, 10 Carrington Street, Sydney NSW 2000, Australia. The validity of certain securities and certain matters with respect to U.S. federal and New York State law have been passed upon for us by Davis Polk & Wardwell LLP, located at 450 Lexington Avenue, New York, New York 10017.

The audited consolidated financial statements for the fiscal year ended June 30, 2023 ‎incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance on the report of Raymond Chabot Grant Thornton LLP, independent registered ‎public accountants, upon the authority of said firm as experts in accounting and auditing.

The consolidated financial statements in respect of the fiscal years ended June 30, 2022 and 2021 ‎incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance on the report of Armanino LLP, independent registered ‎public accountants, upon the authority of said firm as experts in accounting and auditing.

We have filed with the SEC a “shelf” registration statement (including amendments and exhibits to the registration statement) on Form F-3 under the Securities Act. This prospectus does not contain all of the information set forth in the registration statement and the exhibits and schedules to the registration statement. For further information, we refer you to the registration statement and the exhibits and schedules filed as part of the registration statement. If a document has been filed as an exhibit to the registration statement, we refer you to the copy of the document that has been filed. Each statement in this prospectus relating to a document filed as an exhibit is qualified in all respects by the filed exhibit.

In addition, we file reports, including annual reports on Form 20-F, and other information with the SEC. We are allowed four months following the end of our fiscal year to file our annual report with the SEC instead of approximately three, and we are not required to disclose certain detailed information regarding executive compensation that is required from U.S. domestic issuers. In addition, we will not be required under the Exchange Act to file periodic reports and financial statements with the SEC as frequently as companies that are not foreign private issuers whose securities are registered under the Exchange Act. Also, as a foreign private issuer, we are exempt from the rules of the Exchange Act prescribing the furnishing of proxy statements to shareholders, and our senior management, directors and principal shareholders are exempt from the reporting and “short-swing” profit recovery provisions contained in Section 16 of the Exchange Act.

As a foreign private issuer, we also are exempt from the requirements of Regulation FD (Fair Disclosure) which, generally, are meant to ensure that select groups of investors are not privy to specific information about an issuer before other investors. We are still subject to the anti-fraud and anti-manipulation rules of the SEC, such as Rule 10b-5. Since many of the disclosure obligations required of us as a foreign private issuer are different than those required by other U.S. domestic reporting companies, our shareholders, potential shareholders and the investing public in general should not expect to receive information about us in the same amount, and at the same time, as information is received from, or provided by, other U.S. domestic reporting companies. We are liable for violations of the rules and regulations of the SEC which do apply to us as a foreign private issuer.

Our SEC filings, including the registration statement, are available to you on the SEC’s website at http://www.sec.gov. This site contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. We also maintain a website at https://irisenergy.co. Through our website, we make available, free of charge, our annual reports and other information as soon as reasonably practicable after they are electronically filed with, or furnished to, the SEC. The information contained on, or that may be accessed through, our website is not part of, and is not incorporated by reference into, this prospectus.

The rules of the SEC allow us to incorporate information into this prospectus by reference, which means that we disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be part of this prospectus. This prospectus incorporates by reference the documents listed below:

Any statement made in this prospectus or in a document incorporated by reference into this prospectus will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute part of this prospectus.

All subsequent annual reports on Form 20-F, Form 40-F or Form 10-K that we file with the SEC and all subsequent filings on Forms 10-Q and 8-K filed by us with the SEC pursuant to the Exchange Act (excluding, in each case, any information or documents deemed to be furnished and not filed with the SEC), after the date hereof and prior to the termination or expiration of the registration statement of which this prospectus forms a part, shall be incorporated by reference. We may incorporate by reference any reports on Form 6-K that we furnish to the SEC that we specifically identify in such form or in any applicable prospectus supplement as being incorporated by reference into this prospectus or such prospectus supplement (i) after the filing of the registration statement of which this prospectus forms a part and prior to the effectiveness of such registration statement and (ii) after the date of this prospectus and prior to the completion of an offering of securities under this prospectus.

You can obtain any of the filings incorporated by reference into this prospectus through us or from the SEC through the SEC’s website at https://www.sec.gov. We will provide, without charge, to each person, including any beneficial owner, to whom a copy of this prospectus is delivered, upon written or oral request of such person, a copy of any or all of the reports or documents referred to above which have been or may be incorporated by reference into this prospectus. You should direct all requests for those documents to:

We maintain a website at https://irisenergy.co. The information contained on, or that may be accessed through, our website is not part of, and is not incorporated by reference into, this prospectus.

Our Constitution, which is filed as an exhibit to this registration statement, provides for indemnification of the officers and directors to the full extent permitted by applicable law.

In addition, we have entered into agreements to indemnify our directors and executive officers containing provisions, which are in some respects broader than the specific indemnification provisions contained in our Constitution. The indemnification agreements require us, among other things, to indemnify such persons against expenses, including attorneys’ fees, judgments, liabilities, fines and settlement amounts incurred by any such person in actions or proceedings, including actions by us or in our right, that may arise by reason of their status or service as our director or executive officer and to advance expenses incurred by them in connection with any such proceedings.

Insofar as indemnification for liabilities arising under the Securities Act of 1933, as amended (the “Securities Act”) may be permitted to directors, officers and controlling persons of the Company, the Company has been advised that, in the opinion of the U.S. Securities and Exchange Commission (the “SEC”), such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.

The exhibit index attached hereto is incorporated herein by reference.

The undersigned registrant hereby undertakes:

The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers, and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission, such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer, or controlling person of the registrant in the successful defense of any action, suit, or proceeding) is asserted by such director, officer, or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question of whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form F-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Sydney, Australia on February 15, 2024.

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Daniel Roberts and William Roberts and each of them, individually, as his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him and in his name, place and stead in any and all capacities, in connection with this registration statement, including to sign in the name and on behalf of the undersigned, this registration statement and any and all amendments thereto, including post-effective amendments and registrations filed pursuant to Rule 462 under the Securities Act, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the U.S. Securities and Exchange Commission, granting unto such attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or his substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and as of the dates indicated.

Pursuant to the requirements of the Securities Act of 1933, as amended, the undersigned, the duly authorized representative in the United States of Iris Energy Limited has signed this registration statement on February 15, 2024.