SC 13G

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. )*

Mallinckrodt plc

(Name of Issuer)

Ordinary Shares

(Title of Class of Securities)

G5890A102

(CUSIP Number)

December 31, 2022

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

 [x]Rule 13d-1(b)

 [  ]Rule 13d-1(c)

 [  ]Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.  Beneficial ownership information contained herein is given as of the date listed above.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

1	Names of Reporting Persons. Millstreet Capital Management LLC
2	Check the Appropriate Box if a Member of a Group (See Instructions)
	(a)[ ]
	(b)[ ]
3	SEC Use Only
4	Citizenship or Place of Organization. Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5Sole Voting Power 0 shares
	6Shared Voting Power 1,038,565 shares (See Item 4 below)
	7Sole Dispositive Power 0 shares
	8Shared Dispositive Power 1,038,565 shares (See Item 4 below)

9	Aggregate Amount Beneficially Owned by Each Reporting Person 1,038,565 shares (See Item 4 below)
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)     [ ]
11	Percent of Class Represented by Amount in Row (9) 7.89% (See Item 4 below)
12	Type of Reporting Person (See Instructions) IA

1	Names of Reporting Persons. Brian D. Connolly
2	Check the Appropriate Box if a Member of a Group (See Instructions)
	(a)[ ]
	(b)[ ]
3	SEC Use Only
4	Citizenship or Place of Organization. United States

Number of Shares Beneficially Owned by Each Reporting Person With	5Sole Voting Power 0 shares
	6Shared Voting Power 1,038,565 shares (See Item 4 below)
	7Sole Dispositive Power 0 shares
	8Shared Dispositive Power 1,038,565 shares (See Item 4 below)

9	Aggregate Amount Beneficially Owned by Each Reporting Person 1,038,565 shares (See Item 4 below)
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)     [ ]
11	Percent of Class Represented by Amount in Row (9) 7.89% (See Item 4 below)
12	Type of Reporting Person (See Instructions) HC, IN

1	Names of Reporting Persons. Craig M. Kelleher
2	Check the Appropriate Box if a Member of a Group (See Instructions)
	(a)[ ]
	(b)[ ]
3	SEC Use Only
4	Citizenship or Place of Organization. United States

Number of Shares Beneficially Owned by Each Reporting Person With	5Sole Voting Power 0 shares
	6Shared Voting Power 1,038,565 shares (See Item 4 below)
	7Sole Dispositive Power 0 shares
	8Shared Dispositive Power 1,038,565 shares (See Item 4 below)

9	Aggregate Amount Beneficially Owned by Each Reporting Person 1,038,565 shares (See Item 4 below)
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)     [ ]
11	Percent of Class Represented by Amount in Row (9)  7.89% (See Item 4 below)
12	Type of Reporting Person (See Instructions) HC, IN

SCHEDULE 13G

Item 1
	(a)	Name of Issuer
		Mallinckrodt plc
	(b)	Address of Issuer’s Principal Executive Offices
		College Business & Technology Park, Cruiserath Blanchardstown, Dublin 15, Ireland

Item 2
	(a)	Name of Person Filing
		Millstreet Capital Management LLC Brian D. Connolly Craig M. Kelleher
	(b)	Address of Principal Business Office or, if none, Residence
		Millstreet Capital Management LLC Brian D. Connolly Craig M. Kelleher c/o Millstreet Capital Management LLC 545 Boylston Street, 8th Floor Boston, MA 02116
	(c)	Citizenship
		Millstreet Capital Management LLC – Delaware Brian D. Connolly – United States Craig M. Kelleher – United States
	(d)	Title of Class of Securities
		Ordinary Shares
	(e)	CUSIP Number
		G5890A102

Item 3		If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
	(a)		[ ]	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
	(b)		[ ]	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
	(c)		[ ]	Insurance Company as defined in Section 3(a)(19) of the Act;
	(d)		[ ]	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8);
	(e)		[x]	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
	(f)		[ ]	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
	(g)		[x]	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
	(h)		[ ]	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)		[ ]	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)		[ ]	A non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J);
	(k)		[ ]	Group, in accordance with §240.13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

Item 4	Ownership
	Shares reported herein represent 1,038,565 Ordinary Shares, which may be deemed beneficially owned by Millstreet Capital Management LLC (“Millstreet”) in its capacity as investment manager to private investment vehicles.  Mr. Connolly and Mr. Kelleher are Managing Members of Millstreet.  Shares reported herein for Mr. Connolly and Mr. Kelleher represent the above referenced shares reported with respect to Millstreet.  Each of the Reporting Persons disclaims beneficial ownership of the shares reported herein except to the extent of its or his pecuniary interest therein.
Item 4(a)	Amount Beneficially Owned
	Millstreet Capital Management LLC – 1,038,565 shares Brian D. Connolly – 1,038,565 shares Craig M. Kelleher – 1,038,565 shares
Item 4(b)	Percent of Class
	Millstreet Capital Management LLC – 7.89% Brian D. Connolly – 7.89% Craig M. Kelleher – 7.89%
Item 4(c)	Number of shares as to which each such person has voting and dispositive power:
(i)	sole power to vote or to direct the vote
	Millstreet Capital Management LLC – 0 shares Brian D. Connolly – 0 shares Craig M. Kelleher – 0 shares
(ii)	shared power to vote or to direct the vote
	Millstreet Capital Management LLC – 1,038,565 shares Brian D. Connolly – 1,038,565 shares Craig M. Kelleher – 1,038,565 shares
(iii)	sole power to dispose or to direct the disposition of
	Millstreet Capital Management LLC – 0 shares Brian D. Connolly – 0 shares Craig M. Kelleher – 0 shares
(iv)	shared power to dispose or to direct the disposition of
	Millstreet Capital Management LLC – 1,038,565 shares Brian D. Connolly – 1,038,565 shares Craig M. Kelleher – 1,038,565 shares

Item 5	Ownership of Five Percent or Less of a Class
	Not applicable.
Item 6	Ownership of More than Five Percent on Behalf of Another Person
	Not applicable.
Item 7	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company
	Not applicable.
Item 8	Identification and Classification of Members of the Group
	Not applicable.
Item 9	Notice of Dissolution of Group
	Not applicable.
Item 10	Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

Exhibits	Exhibit
99.1	Joint Filing Agreement by and between the Reporting Persons.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 14, 2023

MILLSTREET CAPITAL MANAGEMENT LLC

By: /s/ Brian D. Connolly                                   

            Brian D. Connolly, Managing Member

Brian D. Connolly

 By: /s/ Brian D. Connolly                                  

             Brian D. Connolly

Craig M. Kelleher

 By: /s/ Craig M. Kelleher                                   

             Craig M. Kelleher

EX-99.1

EXHIBIT 99.1

AGREEMENT

JOINT FILING OF SCHEDULE 13G

Each of the undersigned hereby agrees to file jointly the Schedule 13G to which this Agreement is attached, and any amendments to the Schedule 13G (the “Schedule 13G”) filed with respect to the Ordinary Shares of Mallinckrodt plc, which may be deemed necessary, pursuant to Regulation 13D-G under the Securities Exchange Act of 1934, as amended.

It is understood and agreed that each of the parties hereto is responsible for the timely filing of such statement and any future amendments to the Schedule 13G, and for the completeness and accuracy of the information concerning such party contained therein, but such party is not responsible for the completeness or accuracy of information concerning any other party unless such party knows or has reason to believe that such information is inaccurate.

It is understood and agreed that a copy of this Agreement shall be attached as an exhibit to the Schedule 13G, and any future amendments to the Schedule 13G, filed on behalf of each of the parties hereto.

Date: February 14, 2023

MILLSTREET CAPITAL MANAGEMENT LLC

By: /s/ Brian D. Connolly                                   

            Brian D. Connolly, Managing Member

Brian D. Connolly

 By: /s/ Brian D. Connolly                                  

             Brian D. Connolly

Craig M. Kelleher

 By: /s/ Craig M. Kelleher                                   

             Craig M. Kelleher