EXHIBIT 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13D, including all amendments thereto, with respect to the ordinary shares, par value $0.20 per share, of Mallinckrodt plc, and further agree that this Joint Filing Agreement shall be included as an exhibit to the first such joint filing and may, as required, be included as an exhibit to subsequent amendments thereto.

Each of the undersigned agrees and acknowledges that each party hereto is (i) individually eligible to use such Schedule 13D and (ii) responsible for the timely filing of such Schedule 13D and any and all amendments thereto, and for the completeness and accuracy of the information concerning such party contained therein; provided that no party is responsible for the completeness and accuracy of the information concerning any other party unless such party knows or has reason to believe that such information is inaccurate.

Each of the undersigned hereby constitutes and appoints Alexander E. Parker as their true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments to the statement on Schedule 13D, and to file the same, with exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent, full power and authority to do and perform each and every act and thing necessary or desirable to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

This Joint Filing Agreement may be executed in any number of counterparts, all of which together shall constitute one and the same instrument. A facsimile or other reproduction of this Joint Filing Agreement may be executed by one or more parties hereto, and an executed copy of this Joint Filing Agreement may be delivered by one or more parties hereto by facsimile or similar instantaneous electronic transmission device pursuant to which the signature of or on behalf of such party can be seen, and such execution and delivery shall be considered valid, binding and effective for all purposes as of the date hereof.

Dated: August 2, 2021

[SIGNATURE PAGES FOLLOW]

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the date first written above.

BUXTON HELMSLEY HOLDINGS, INC.
By:	/s/ Alexander E. Parker	August 2, 2021
Name:	Alexander E. Parker
Title:	Director
THE BUXTON HELMSLEY GROUP, INC.
By:	/s/ Alexander E. Parker	August 2, 2021
Name:	Alexander E. Parker
Title:	Senior Managing Director
ALEXANDER E. PARKER
By:	/s/ Alexander E. Parker	August 2, 2021
Name:	Alexander E. Parker
VLADISLAV DIKII
By:	/s/ Vladislav Dikii	August 2, 2021
Name:	Vladislav Dikii
VLADIMIR KOVALENKO
By:	/s/ Vladimir Kovalenko	August 2, 2021
Name:	Vladimir Kovalenko
KHARKOV ALEKSANDR SERGEEVICH
By:	/s/ Kharkov Aleksandr Sergeevich	August 2, 2021
Name:	Kharkov Aleksandr Sergeevich
ELENA TSYGANKOVA
By:	/s/ Elena Tsygankova	August 2, 2021
Name:	Elena Tsygankova

THOMAS GITTER
By:	/s/ Thomas Gitter	August 2, 2021
Name:	Thomas Gitter
DANILIUK KIRILL VLADIMIROVICH
By:	/s/ Daniliuk Kirill Vladimirovich	August 2, 2021
Name:	Daniliuk Kirill Vladimirovich
ROMAN DONTSOV VALENTINOVICH
By:	/s/ Roman Dontsov Valentinovich	August 2, 2021
Name:	Roman Dontsov Valentinovich
ALEXEY ISAEV
By:	/s/ Alexey Isaev	August 2, 2021
Name:	Alexey Isaev
ALEXANDER KOCH
By:	/s/ Alexander Koch	August 2, 2021
Name:	Alexander Koch
JAMES JONATHAN JOSEY
By:	/s/ James Jonathan Josey	August 2, 2021
Name:	James Jonathan Josey
PRADEEP VASUDEVA KADAMBI
By:	/s/ Pradeep Vasudeva Kadambi	August 2, 2021
Name:	Pradeep Vasudeva Kadambi

EDGARD GAFUROV
By:	/s/ Edgard Gafurov	August 2, 2021
Name:	Edgard Gafurov
KIMBERLY TULLY
By:	/s/ Kimberly Tully	August 2, 2021
Name:	Kimberly Tully
JOAN I. BARRY REVOCABLE TRUST (DTD. 12/13/13)
By:	/s/ Janice J. O'Connor	August 2, 2021
Name:	Janice J. O'Connor
Title:	Co-Trustee
JAMES PAUL CAREY
By:	/s/ James Paul Carey	August 2, 2021
Name:	James Paul Carey
JANICE J. O'CONNOR
By:	/s/ Janice J. O'Connor	August 2, 2021
Name:	Janice J. O'Connor
ANDREW GRUBER
By:	/s/ Andrew Gruber	August 2, 2021
Name:	Andrew Gruber
YUSHENKOVA OLGA PETROVNA
By:	/s/ Yushenkova Olga Petrovna	August 2, 2021
Name:	Yushenkova Olga Petrovna

VANIK PETROSIAN
By:	/s/ Vanik Petrosian	August 2, 2021
Name:	Vanik Petrosian
RICHARD BARRY
By:	/s/ Richard Barry	August 2, 2021
Name:	Richard Barry
ZAVOLOZHIN SERGEY VLADIMIROVICH
By:	/s/ Zavolozhin Sergey Vladimirovich	August 2, 2021
Name:	Zavolozhin Sergey Vladimirovich
CHRIS TICHENOR
By:	/s/ Chris Tichenor	August 2, 2021
Name:	Chris Tichenor
VICTOR PARDO
By:	/s/ Victor Pardo	August 2, 2021
Name:	Victor Pardo
ALEX PETER WOUNLUND
By:	/s/ Alex Peter Wounlund	August 2, 2021
Name:	Alex Peter Wounlund
PETR HOFEREK
By:	/s/ Petr Hoferek	August 2, 2021
Name:	Petr Hoferek

JOHN V. BARRY REVOCABLE TRUST (DTD. 12/13/13)
By:	/s/ Janice J. O'Connor	August 2, 2021
Name:	Janice J. O'Connor
Title:	Co-Trustee
NEPIYVODA KIRILL NIKOLAEVICH
By:	/s/ Nepiyvoda Kirill Nikolaevich	August 2, 2021
Name:	Nepiyvoda Kirill Nikolaevich
MARY DUNNE
By:	/s/ Mary Dunne	August 2, 2021
Name:	Mary Dunne
LISRAEL LARRONDO
By:	/s/ Lisrael Larrondo	August 2, 2021
Name:	Lisrael Larrondo
DAVID LAMB
By:	/s/ David Lamb	August 2, 2021
Name:	David Lamb
VALERII MANSUROV
By:	/s/ Valerii Mansurov	August 2, 2021
Name:	Valerii Mansurov