Mallinckrodt Now a Component of the S&P 500 Index

--Company’s Balance Sheet, Cash Generation and Leverage Significantly Strengthened Following Close of Questcor Pharmaceuticals Acquisition--

DUBLIN--()--Mallinckrodt plc (NYSE: MNK), a leading global specialty pharmaceutical company, announced today that it has become a component of the S&P 500 Index. The inclusion comes following the completion of Mallinckrodt’s acquisition of Questcor Pharmaceuticals last week. In addition to increasing the market capitalization of Mallinckrodt, the combination has significantly strengthened the company’s balance sheet, cash generation and leverage position.

“We are extremely honored to be listed on the S&P 500 Index, which comprises companies with some of the most recognizable and enduring brands in the world,” said Matthew Harbaugh, Mallinckrodt’s Chief Financial Officer. “The index is widely recognized as a bellwether of the American equities market. We are also pleased to have significantly improved the net leverage profile of the company from where it was just a few short months ago. This event marks yet another milestone toward our long-term goal of becoming a top-performing specialty pharmaceutical company.”

Mallinckrodt’s total net leverage ratio[1] decreased from 3.8x on June 27, 2014 to approximately 3x following the closing of the transaction. This decrease reflects the strong adjusted EBITDA generation from H.P. Acthar® Gel, Questcor’s primary drug, relative to the debt incurred in the transaction.

About Mallinckrodt

Mallinckrodt is a global specialty pharmaceutical and medical imaging business that develops, manufactures, markets and distributes specialty pharmaceutical products and medical imaging agents. The company's core strengths include the acquisition and management of highly regulated raw materials; deep regulatory expertise; and specialized chemistry, formulation and manufacturing capabilities. The company's Specialty Pharmaceuticals segment includes branded and specialty generic drugs and active pharmaceutical ingredients, and the Global Medical Imaging segment includes contrast media and nuclear imaging agents. Mallinckrodt has more than 5,500 employees worldwide and a commercial presence in roughly 65 countries. The company's fiscal 2013 revenue totaled $2.2 billion. To learn more about Mallinckrodt, visit www.mallinckrodt.com.

Forward-Looking Statements

Statements in this document that are not strictly historical, including statements regarding the Questcor acquisition, future financial and operating results, benefits and synergies of the transaction, future opportunities for the combined businesses and any other statements regarding events or developments that we believe or anticipate will or may occur in the future, may be “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995, and involve a number of risks and uncertainties. There are a number of important factors that could cause actual events to differ materially from those suggested or indicated by such forward-looking statements and you should not place undue reliance on any such forward-looking statements. These factors include risks and uncertainties related to, among other things: general economic conditions and conditions affecting the industries in which Mallinckrodt and Questcor operate; the commercial success of Mallinckrodt's and Questcor's products, including H.P. Acthar® Gel ("Acthar"); Mallinckrodt's and Questcor's ability to protect intellectual property rights; Mallinckrodt's ability to successfully integrate Questcor's operations and employees with Mallinckrodt's existing business; the ability to realize anticipated growth, synergies and cost savings; Questcor's performance and maintenance of important business relationships; the lack of patent protection for Acthar, and the possible United States Food and Drug Administration ("FDA") approval and market introduction of additional competitive products; Questcor's reliance on Acthar for substantially all of its net sales and profits; Questcor's ability to continue to generate revenue from sales of Acthar to treat on-label indications associated with nephrotic syndrome, multiple sclerosis, infantile spasms or rheumatology-related conditions, and Questcor's ability to develop other therapeutic uses for Acthar; volatility in Questcor's Acthar shipments, estimated channel inventory, and end-user demand; an increase in the proportion of Questcor's Acthar unit sales comprised of Medicaid-eligible patients and government entities; Questcor's research and development risks, including risks associated with Questcor's work in the areas of nephrotic syndrome and lupus, and Questcor's efforts to develop and obtain FDA approval of Synacthen™ Depot; Mallinckrodt's ability to receive procurement and production quotas granted by the U.S. Drug Enforcement Administration; Mallinckrodt's ability to obtain and/or timely transport molybdenum-99 to its technetium-99m generator production facilities; customer concentration; cost containment efforts of customers, purchasing groups, third-party payors and governmental organizations; Mallinckrodt's ability to successfully develop or commercialize new products; competition; Mallinckrodt's ability to achieve anticipated benefits of price increases; Mallinckrodt's ability to integrate acquisitions of technology, products and businesses generally; product liability losses and other litigation liability; the reimbursement practices of a small number of large public or private issuers; complex reporting and payment obligations under healthcare rebate programs; changes in laws and regulations; conducting business internationally; foreign exchange rates; material health, safety and environmental liabilities; litigation and violations; information technology infrastructure; and restructuring activities. Additional information regarding the factors that may cause actual results to differ materially from these forward looking statements is available in (i) Mallinckrodt's SEC filings, including its Annual Report on Form 10-K for the fiscal year ended September 27, 2013 and its Quarterly Reports on Form 10-Q for the quarterly periods ended December 27, 2013, March 28, 2014 and June 27, 2014; (ii) the SEC filings of Cadence Pharmaceuticals, Inc., which was acquired by Mallinckrodt on March 19, 2014, including its Annual Report on Form 10-K for the fiscal year ended December 31, 2013; and (iii) Questcor's SEC filings, including its Annual Report on Form 10-K for the year ended December 31, 2013 (and the amendment thereto on Form 10-K/A), its Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2014 and June 30, 2014, and its Current Report on Form 8-K filed with the SEC on July 10, 2014. The forward-looking statements made herein speak only as of the date hereof and none of Mallinckrodt, Questcor or any of their respective affiliates assumes any obligation to update or revise any forward-looking statement, whether as a result of new information, future events and developments or otherwise, except as required by law.

[1] Total net leverage ratio represents total debt less cash and cash equivalents divided by the historical adjusted EBITDA for the trailing twelve months of the combined company. Adjusted EBITDA is defined as net income excluding income tax expense, interest and depreciation and amortization plus certain additional items. These additional items, if applicable, include: discontinued operations; other income, net; separation costs; restructuring charges, net; immediately expensed up-front and milestone payments; acquisition-related costs; share-based compensation; fair value adjustments to contingent consideration; certain environmental charges; non-cash impairment charges; and certain other non-recurring items.

Contacts

Mallinckrodt plc
Investors:
John Moten, 314-654-6650
Vice President, Investor Relations
john.moten@mallinckrodt.com
or
Lynn Phillips, 314-654-3263
Manager, Media Relations
lynn.phillips@mallinckrodt.com
or
Meredith Fischer, 314-654-3318
Senior Vice President, Communications and Public Affairs
meredith.fischer@mallinckrodt.com

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Contacts

Mallinckrodt plc
Investors:
John Moten, 314-654-6650
Vice President, Investor Relations
john.moten@mallinckrodt.com
or
Lynn Phillips, 314-654-3263
Manager, Media Relations
lynn.phillips@mallinckrodt.com
or
Meredith Fischer, 314-654-3318
Senior Vice President, Communications and Public Affairs
meredith.fischer@mallinckrodt.com