FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Expires: December 31, 2014 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person * Carlson Christopher (Last) (First) (Middle) TWO WESTBROOK CORPORATE CENTER, SUITE 500 (Street) WESTCHESTER IL 60154 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol IAA, Inc. [ IAA ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) VP and Corporate Controller
	3. Date of Earliest Transaction (Month/Day/Year) 03/20/2023
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/20/2023		A		1,014 (1) (2)	A	(1) (2)	8,222.8859	D
Common Stock	03/20/2023		D		8,222.8859 (3)	D	(1) (2) (3) (4)	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Pursuant to an Agreement and Plan of Merger and Reorganization, dated as of November 7, 2022, as amended by the Amendment to the Agreement and Plan of Merger and Reorganization, dated as of January 22, 2023 (the "Merger Agreement" and the transactions contemplated thereby, the "Merger"), by and among the Issuer, a Delaware corporation, Ritchie Bros. Auctioneers Incorporated, a company organized under the federal laws of Canada ("RBA"), Ritchie Bros. Holdings Inc., a Washington corporation and a direct and indirect wholly owned subsidiary of RBA ("US Holdings"), Impala Merger Sub I, LLC, a Delaware limited liability company and a direct wholly owned subsidiary of US Holdings, and Impala Merger Sub II, LLC, a Delaware limited liability company and a direct wholly owned subsidiary of US Holdings,

2. (Continued from Footnote 1) awards of restricted stock units previously granted by the Issuer that were subject to performance-based vesting conditions were assumed by RBA at the effective time of the Merger (the "Effective Time") and converted into the right to receive, upon vesting, a number of RBA common shares determined based on an equity award exchange ratio of 0.763139 RBA common shares per share of Issuer stock underlying such award (the "equity award exchange ratio"). The RBA common shares underlying these restricted stock units will be subject to the same terms and conditions, including time-based vesting and forfeiture provisions, but not performance-vesting provisions, as applied to the restricted stock units as of immediately prior to the Effective Time.

3. Pursuant to the Merger Agreement, each share of the Issuer's common stock held by the Reporting Person, automatically and without any required action by the Reporting Person, was converted into the right to receive: (i) 0.5252 of a common share of RBA plus cash in lieu of any fractional RBA common share, and (ii) $12.80 in cash, without interest and less any required withholding taxes.

4. In addition to the restricted stock units described in footnote 1, includes 4,866 shares underlying restricted stock units that were subject to time-based vesting conditions. Pursuant to the terms of the Merger Agreement, these restricted stock units were assumed by RBA at the Effective Time and converted into the right to receive a number of RBA common shares determined based on the equity award exchange ratio. The RBA common shares stock underlying these restricted stock units will be subject to the same terms and conditions, including vesting and forfeiture terms, applicable to the restricted stock units as of immediately prior to the Effective Time.

	Christopher Carlson /s/ Sidney Peryar as attorney-in-fact	03/21/2023
	** Signature of Reporting Person	Date
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