MALLINCKRODT PLC. (NYSE: MNK)

Letters from Buxton Helmsley regarding Mallinckrodt Plc.
(some, released as part of Schedule 13(d) filings), by date:

February 11, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: February 9, 2022, Letter from Mallinckrodt Plc. to The Buxton Helmsley Group, Inc.): https://www.sec.gov/Archives/edgar/data/1567892/000106299322003810/exhibit99-2.htm

January 31, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: Updated Notice of The Buxton Helmsley Group, Inc.'s Significant Interest in the Ordinary Shares of Mallinckrodt Plc..."): https://www.sec.gov/Archives/edgar/data/1567892/000106299322001878/exhibit99-2.htm

January 31, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: Notice of Second Violation Instance of the Companies Act of 2014, § 216..."): https://www.sec.gov/Archives/edgar/data/1567892/000106299322001878/exhibit99-3.htm

January 25, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: The Buxton Helmsley Group, Inc.'s Notice of Significant Ownership of Ordinary Shares - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299322001616/exhibit99-2.htm

January 19, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: Notice of Additional Statutory Breach (Failure to Cooperate with Request for Production of Registers and Meeting Minutes, Pursuant to Companies Act of 2014, § 216)..."): https://www.sec.gov/Archives/edgar/data/1567892/000106299322001483/exhibit99-2.htm

January 15, 2022, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Re: Letter Response - 'Notice under Section 1062 Companies Act 2014'"): https://www.sec.gov/Archives/edgar/data/1567892/000106299322001483/exhibit99-3.htm

November 12, 2021, Letter to Mallinckrodt Plc.'s Resigning Senior Vice President, Ms. Kathleen Schaefer (Subject: "November 3, 2021, Resignation as Senior Vice President, Finance – Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321010696/exhibit99-2.htm

November 12, 2021, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Departure of Ms. Brandi Robinson, SVP and Chief Communications Officer – Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321010696/exhibit99-3.htm

November 5, 2021, Letter to Mallinckrodt Plc. Board of Directors (Subject: "November 3, 2021, Resignation of Ms. Kathy Schaefer, Senior Vice President of Finance - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/0001567892/000106299321010299/exhibit99-2.htm

November 5, 2021, Letter to Mallinckrodt Plc. Irish Counsel (Subject: "November 2, 2021, Response Letter - Mallinckrodt Plc. and The Buxton Helmsley Group, Inc."): https://www.sec.gov/Archives/edgar/data/0001567892/000106299321010299/exhibit99-3.htm

October 22, 2021, Letter to Mallinckrodt Plc. Board of Directors (Subject: "Board of Director E-Mail Account (Rejection of Inbound Correspondence) - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321009816/exhibit99-3.htm

October 20, 2021, Open Letter to U.S. Securities and Exchange Commission (Subject: "Accounting Fraud, Bankruptcy Fraud, Insider Trading, Proxy Fraud, and Electoral Fraud - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321009816/exhibit99-2.htm

October 14, 2021, Letter (Subject: "September 17, 2021, Response Letter - "Mallinckrodt Plc. and The Buxton Helmsley Group, Inc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321009546/exhibit99-2.htm

September 14, 2021, Letter (Subject: "Notice of Whistleblower Report Filed (via U.S. Securities and Exchange Commission) - Securities, Bankruptcy, Accounting, and Electoral Fraud at Mallinckrodt Plc. (OTC: MNKKQ) - Accounting Fraud by..."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321008602/exhibit99-2.htm

August 17, 2021, Letter (Subject: "Unlawful August 13, 2021, Annual General Meeting, Notice of Now-Active Breach of the Companies Act of 2014, § 175, Refusal of Board to Concede to Election Results Dismissing All Directors, and Fraudulent Re-Addition of Just-Dismissed Directors..."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007665/exhibit99-2.htm

August 5, 2021, Letter (Subject: "August 2, 2021, Letter Attempting to Clarify Shareholder Oppression Order - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-2.htm

August 2, 2021, Letter (Subject: "Failure of Response to Critical Integrity Issues/Concerns Raised to Board of Directors - Mallinckrodt Plc."): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-3.htm

July 7, 2021, Letter (Subject: "Notice of Election Rigging by Directors and Management - Mallinckrodt Plc. (2021 Annual General Meeting)"): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-4.htm

June 1, 2021, Letter (Subject: "Re: Mallinckrodt Plc. Reorganization - Notice of Shareholder Oppression in Violation of Companies Act of 2014, § 212"): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-5.htm

May 20, 2021, Letter (Subject: "Mallinckrodt Plc. Reorganization - Notice of Shareholder Oppression in Violation of Companies Act of 2014, § 212"): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-6.htm

March 10, 2021, Letter (Subject: "Mallinckrodt Plc. Shareholder Action - Immediate Response Demanded and Required"): https://www.sec.gov/Archives/edgar/data/1567892/000106299321007089/exhibit99-7.htm