MSDA MSD Acquisition Corporation

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	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	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 * MSD SPONSOR HOLDINGS, LLC	2. Issuer Name and Ticker or Trading Symbol MSD ACQUISITION CORP. / NEW [ MSDA ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    __X__ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) C/O MSD ACQUISITION CORP., ONE VANDERBILT AVENUE, 26TH FLOOR	3. Date of Earliest Transaction (MM/DD/YYYY) 3/29/2023
(Street) NEW YORK, NY 10017	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ 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

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 Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. 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 Date		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 of Derivative Security: 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
Class B ordinary shares	(1)	3/29/2023		J		14224999		(1)	(1)	Class A ordinary shares	14224999	(1)	1	D (2)

Explanation of Responses:
(1)	On March 17, 2023, the Issuer announced that it will not consummate an initial business combination within the time period required. Pursuant to the Issuer's Amended and Restated Memorandum and Articles of Association (the "Articles") and in connection with the winding up of the Issuer, the Class B ordinary shares, par value $0.0001, held by MSD Sponsor Holdings, LLC (the "Sponsor") were surrendered for no compensation on March 29, 2023.
(2)	This Form 4 is being filed by the Sponsor. The Class B ordinary shares are held in the name of the Sponsor. The Sponsor is managed by a board of managers comprised of Gregg Lemkau, John Phelan and Robert Platek, who control the Sponsor. Accordingly, Messrs. Lemkau, Phelan and Platek have voting and investment discretion with respect to the securities held by the Sponsor, and may be deemed to have beneficial ownership of the securities held directly by the Sponsor. Each of Messrs. Lemkau, Phelan and Platek disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

Remarks: After giving effect to the Issuer's delisting and deregistration, the Reporting Persons will no longer be subject to Section 16 reporting obligations.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MSD SPONSOR HOLDINGS, LLC C/O MSD ACQUISITION CORP. ONE VANDERBILT AVENUE, 26TH FLOOR NEW YORK, NY 10017		X
LEMKAU GREGG C/O MSD ACQUISITION CORP. ONE VANDERBILT AVENUE, 26TH FLOOR NEW YORK, NY 10017	X	X	Chief Executive Officer
PHELAN JOHN C/O MSD ACQUISITION CORP. ONE VANDERBILT AVENUE, 26TH FLOOR NEW YORK, NY 10017	X	X

Signatures
MSD Sponsor Holdings, LLC, By: /s/ Marcello Liguori, Vice President		3/30/2023
**Signature of Reporting Person		Date
/s/ Marcello Liguori as attorney in fact for Gregg Lemkau		3/30/2023
**Signature of Reporting Person		Date
/s/ Marcello Liguori as attorney in fact for John Phelan		3/30/2023
**Signature of Reporting Person		Date

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).
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