FORM 4
☒ Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

PERYAR SIDNEY		 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)
Chief Legal Officer
(Last)          (First)          (Middle)

TWO WESTBROOK CORPORATE CENTER, SUITE 500		 3. Date of Earliest Transaction (MM/DD/YYYY)

3/20/2023
(Street)

WESTCHESTER, IL 60154		 4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)        (State)        (Zip)
Rule 10b5-1(c) Transaction Indication
☐ Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 3/20/2023  A  11851 (1)(2)A (1)(2)40913.9246 D  
Common Stock 3/20/2023  D  40913.9246 (3)D (1)(2)(3)(4)0 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Employee stock option (right to buy) $46.97 3/20/2023  D     20917   (5)7/29/2029 Common Stock 20917  (5)0 D  
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 9,192 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.
(5) This option, which provided for vesting in three equal annual installments beginning on July 29, 2020, was assumed by RBA at the Effective Time and converted into an option to purchase a number of RBA common shares and at an exercise price, in each case determined based on the equity award exchange ratio. The RBA common shares underlying the option will be subject to the same terms and conditions, including vesting, exercise, expiration and forfeiture terms, applicable to the option as of immediately prior to the Effective Time.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
PERYAR SIDNEY
TWO WESTBROOK CORPORATE CENTER
SUITE 500
WESTCHESTER, IL 60154

Chief Legal Officer
Signatures
/s/ Sidney Peryar3/21/2023
**Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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