Mallinckrodt (MNKTQ) SC 13G Mallinckrodt / Millstreet Capital Management ownership change

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