Exhibit 99.1

Ritchie Bros. and IAA Announce Receipt of Regulatory Clearances for Proposed Merger

VANCOUVER, BC, and WESTCHESTER, Ill. – December 20, 2022 - Ritchie Bros. Auctioneers Incorporated (NYSE: RBA) (TSX: RBA) ("Ritchie Bros.”) and IAA, Inc. (NYSE: IAA) (“IAA”), today announced expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and receipt of a no-action letter from the Canadian Commissioner of Competition with respect to the pending acquisition of IAA by Ritchie Bros. The parties have received all necessary regulatory clearance required pursuant to the previously announced Agreement and Plan of Merger and Reorganization between the parties dated as of November 7, 2022. The transaction is expected to close in the first half of 2023, subject to approval by Ritchie Bros. shareholders of the issuance of Ritchie Bros. common shares in connection with the acquisition, adoption of the merger agreement by IAA stockholders, and other customary closing conditions.

About Ritchie Bros.

Established in 1958, Ritchie Bros. (NYSE and TSX: RBA) is a global asset management and disposition company, offering customers end-to-end solutions for buying and selling used heavy equipment, trucks and other assets. Operating in a number of sectors, including construction, transportation, agriculture, energy, mining, and forestry, the company's selling channels include: Ritchie Bros. Auctioneers, the world's largest industrial auctioneer offering live auction events with online bidding; IronPlanet, an online marketplace with weekly featured auctions and providing the exclusive IronClad Assurance^(R) equipment condition certification; Marketplace-E, a controlled marketplace offering multiple price and timing options; Ritchie List, a self-serve listing service for North America; Mascus, a leading European online equipment listing service; Ritchie Bros. Private Treaty, offering privately negotiated sales; and sector-specific solutions GovPlanet, TruckPlanet, and Ritchie Bros. Energy. The company's suite of solutions also includes Ritchie Bros. Asset Solutions and Rouse Services LLC, which together provides a complete end-to-end asset management, data-driven intelligence and performance benchmarking system; SmartEquip, an innovative technology platform that supports customers' management of the equipment lifecycle and integrates parts procurement with both OEMs and dealers; plus equipment financing and leasing through Ritchie Bros. Financial Services. For more information about Ritchie Bros., visit RitchieBros.com.

Photos and video for embedding in media stories are available at rbauction.com/media.

About IAA

IAA, Inc. (NYSE: IAA) is a leading global digital marketplace connecting vehicle buyers and sellers. Leveraging leading-edge technology and focusing on innovation, IAA’s unique platform facilitates the marketing and sale of total-loss, damaged and low-value vehicles. Headquartered near Chicago in Westchester, Illinois, IAA has nearly 4,500 employees and more than 210 facilities throughout the U.S., Canada and the United Kingdom. IAA serves a global buyer base – located throughout over 170 countries – and a full spectrum of sellers, including insurers, dealerships, fleet lease and rental car companies, and charitable organizations. Buyers have access to multiple digital bidding and buying channels, innovative vehicle merchandising, and efficient evaluation services, enhancing the overall purchasing experience. IAA offers sellers a comprehensive suite of services aimed at maximizing vehicle value, reducing administrative costs, shortening selling cycle time and delivering the highest economic returns. For more information visit IAAI.com, and follow IAA on Facebook, Twitter, Instagram, YouTube and LinkedIn.

Forward-Looking Statements

This communication contains information relating to a proposed business combination transaction between Ritchie Bros. Auctioneers Incorporated (“RBA”) and IAA, Inc. (“IAA”). This communication includes forward-looking information within the meaning of Canadian securities legislation and forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Forward-looking statements may include statements relating to future events and anticipated results of operations, business strategies, the anticipated benefits of the proposed transaction, the anticipated impact of the proposed transaction on the combined company’s business and future financial and operating results, the expected amount and timing of synergies from the proposed transaction, the anticipated closing date for the proposed transaction, other aspects of RBA’s or IAA’s respective businesses, operations, financial condition or operating results and other statements that are not historical facts. There can be no assurance that the proposed transaction will in fact be consummated. These forward-looking statements generally can be identified by phrases such as “will,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “predicts,” “potential,” “continue,” “foresees,” “forecasts,” “estimates” or other words or phrases of similar import.

It is uncertain whether any of the events anticipated by the forward-looking statements will transpire or occur, or if any of them do, what impact they will have on the results of operations and financial condition of the combined companies or the price of RBA’s common shares or IAA’s common stock. Therefore, you should not place undue reliance on any such statements and caution must be exercised in relying on forward-looking statements. While RBA’s and IAA’s management believe the assumptions underlying the forward-looking statements are reasonable, these forward-looking statements involve certain risks and uncertainties, many of which are beyond the parties’ control, that could cause actual results to differ materially from those indicated in such forward-looking statements, including but not limited to: the possibility that shareholders of RBA may not approve the issuance of new common shares of RBA in the transaction or that stockholders of IAA may not approve the adoption of the merger agreement; the risk that a condition to closing of the proposed transaction may not be satisfied (or waived), that either party may terminate the merger agreement or that the closing of the proposed transaction might be delayed or not occur at all; the anticipated tax treatment of the proposed transaction; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the proposed transaction; the diversion of management time on transaction-related issues; the response of competitors to the proposed transaction; the ultimate difficulty, timing, cost and results of integrating the operations of RBA and IAA; the effects of the business combination of RBA and IAA, including the combined company’s future financial condition, results of operations, strategy and plans; the failure (or delay) to receive the required regulatory approval of the transaction; the fact that operating costs and business disruption may be greater than expected following the public announcement or consummation of the proposed transaction; the effect of the announcement, pendency or consummation of the proposed transaction on the trading price of RBA’s common shares or IAA’s common stock; the ability of RBA and/or IAA to retain and hire key personnel and employees; the significant costs associated with the proposed transaction; the outcome of any legal proceedings that could be instituted against RBA, IAA and/or others relating to the proposed transaction; restrictions during the pendency of the proposed transaction that may impact the ability of RBA and/or IAA to pursue non-ordinary course transactions, including certain business opportunities or strategic transactions; the ability of the combined company to realize anticipated synergies in the timeframe expected or at all; changes in capital markets and the ability of the combined company to finance operations in the manner expected; legislative, regulatory and economic developments affecting the business of RBA and IAA; general economic and market developments and conditions; the evolving legal, regulatory and tax regimes under which RBA and IAA operates; unpredictability and severity of catastrophic events, including, but not limited to, pandemics, acts of terrorism or outbreak of war or hostilities, as well as RBA’s or IAA’s response to any of the aforementioned factors. These risks, as well as other risks related to the proposed transaction, are included in the registration statement on Form S-4 and joint proxy statement/prospectus filed with the Securities and Exchange Commission (the “SEC”) on December 14, 2022, and applicable Canadian securities regulatory authorities in connection with the proposed transaction. While the list of factors presented here is, and the list of factors presented in the registration statement on Form S-4 are, considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties.

For additional information about other factors that could cause actual results to differ materially from those described in the forward-looking statements, please refer to RBA’s and IAA’s respective periodic reports and other filings with the SEC and/or applicable Canadian securities regulatory authorities, including the risk factors identified in RBA’s most recent Quarterly Reports on Form 10-Q and Annual Report on Form 10-K and IAA’s most recent Quarterly Reports on Form 10-Q and Annual Report on Form 10-K. The forward-looking statements included in this communication are made only as of the date hereof. Neither RBA nor IAA undertakes any obligation to update any forward-looking statements to reflect actual results, new information, future events, changes in its expectations or other circumstances that exist after the date as of which the forward-looking statements were made, except as required by law.

No Offer or Solicitation

This communication is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any offer, solicitation or sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended, or pursuant to an exemption from, or in a transaction not subject to, such registration requirements.

Important Additional Information and Where to Find It

In connection with the proposed transaction, RBA filed with the SEC and applicable Canadian securities regulatory authorities a registration statement on Form S-4 to register the common shares of RBA to be issued in connection with the proposed transaction on December 14, 2022. The registration statement includes a joint proxy statement/prospectus which will be sent to the shareholders of RBA and stockholders of IAA seeking their approval of their respective transaction-related proposals. Each of RBA and IAA may also file other relevant documents with the SEC and/or applicable Canadian securities regulatory authorities regarding the proposed transaction. This document is not a substitute for the proxy statement/prospectus or registration statement or any other document that RBA or IAA may file with the SEC and/or applicable Canadian securities regulatory authorities. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE RELATED JOINT PROXY STATEMENT/PROSPECTUS, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS AND ANY OTHER RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC AND APPLICABLE CANADIAN SECURITIES REGULATORY AUTHORITIES IN CONNECTION WITH THE PROPOSED TRANSACTION OR INCORPORATED BY REFERENCE IN THE PROXY STATEMENT/PROSPECTUS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT RBA, IAA AND THE PROPOSED TRANSACTION.

Investors and security holders may obtain copies of these documents (when they are available) free of charge through the website maintained by the SEC at www.sec.gov, SEDAR at www.sedar.com or from RBA at its website, investor.ritchiebros.com, or from IAA at its website, investors.iaai.com. Documents filed with the SEC and applicable Canadian securities regulatory authorities by RBA (when they are available) will be available free of charge by accessing RBA’s website at investor.ritchiebros.com under the heading Financials/SEC Filings, or, alternatively, by directing a request by telephone or mail to RBA at 9500 Glenlyon Parkway, Burnaby, BC, V5J 0C6, Canada, and documents filed with the SEC by IAA (when they are available) will be available free of charge by accessing IAA’s website at investors.iaai.com or by contacting IAA’s Investor Relations at investors@iaai.com.

Participants in the Solicitation

RBA and IAA and certain of their respective directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies from the shareholders of RBA and stockholders of IAA in respect of the proposed transaction under the rules of the SEC. Information about RBA’s directors and executive officers is available in RBA’s definitive proxy statement on Schedule 14A for its 2022 Annual Meeting of Shareholders, which was filed with the SEC and applicable Canadian securities regulatory authorities on March 15, 2022, and certain of its Current Reports on Form 8-K. Information about IAAs directors and executive officers is available in IAA’s definitive proxy statement on Schedule 14A for its 2022 Annual Meeting of Stockholders, which was filed with the SEC on May 2, 2022, and certain of its Current Reports on Form 8-K. Other information regarding persons who may be deemed participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, are contained or will be contained in the joint proxy statement/prospectus and other relevant materials filed or to be filed with the SEC and applicable Canadian securities regulatory authorities regarding the proposed transaction when they become available. Investors should read the joint proxy statement/prospectus carefully before making any voting or investment decisions. You may obtain free copies of these documents from RBA or IAA free of charge using the sources indicated above.

Ritchie Bros. Contacts

Investors

Sameer Rathod
Vice President, Investor Relations & Market Intelligence
(510) 381-7584
srathod@ritchiebros.com

Media

Dan Katcher / Kelly Sullivan / Lucas Pers / Haley Salas

Joele Frank, Wilkinson Brimmer Katcher

(212) 355-4449

IAA Contacts

Investors

Farah Soi / Caitlin Churchill

ICR

(203) 682-8200

IAA_IR@icrinc.com

Media

Jeanene O’Brien

SVP Global Marketing & Communications

(312) 622-4068

jobrien@iaai.com