Filed by Mallinckrodt plc (Commission File No.
001-35803)
Pursuant to Rule 425 of the Securities Act of 1933
and deemed filed Pursuant to Rule 14a-12
of the Securities Exchange Act of 1934
Subject Company: Endo, Inc. (Commission File No. 333-280767)
[Name]
[Address]
By email only
RE: Mallinckrodt and Endo to Combine to Create a Global, Scaled,
Diversified Pharmaceuticals Leader
13 March 2025
Dear [Name],
As Global Operations Lead for Mallinckrodt Brands,
which includes our facility in Blanchardstown, Dublin 15, I want to take this opportunity to inform you that today we announced that Mallinckrodt
plc (“Mallinckrodt”) has entered into a definitive agreement with Endo, Inc. (“Endo”), to combine to create a
global, scaled, diversified pharmaceuticals leader.
Strategic and Financial Rationale
This transaction brings together two highly complementary
businesses to broaden patient access and develop new therapies to address unmet patient needs and will accelerate value creation for our
shareholders, customers, employees, the patients we serve and our other stakeholders. We combine durable, on-market products in our branded
portfolios and extensive capabilities across the value chain in our generics businesses.
The combined company will possess a branded business
with the scale, cash flow and balance sheet strength to invest in innovation and both internal and external growth opportunities, including
pursuing commercial-stage assets.
Mallinckrodt and Endo plan to combine their generic
pharmaceuticals businesses and Endo’s sterile injectables business after the close of the transaction and intend to separate that
business from the combined company at a later date.
Leadership and Corporate Headquarters to remain
in College Business & Technology Park, Dublin 15
Following completion of the transaction, Mallinckrodt’s
headquarters in Dublin 15, will serve as the combined company’s global headquarters. The location of the combined company’s
U.S. headquarters, as well as the corporate name, will be announced in due course. Upon completion of the transaction, Siggi Olafsson,
President,CEO and Board member of Mallinckrodt, will become President, CEO and a member of the Board of Directors of the combined company,
and Paul Efron, a member of the Endo Board of Directors, will serve as Board Chair.
Transaction Details
Under the terms of the agreement, Endo shareholders
will receive a total of $80 million in cash (subject to possible adjustment) and Endo shareholders will own 49.9% of the combined company
on a pro forma basis. After cash consideration, Mallinckrodt shareholders will own 50.1% of the combined company on a pro forma basis,
for an implied pro forma enterprise value of $6.7 billion.1

Mallinckrodt in Ireland
Mallinckrodt has a proud history of operating
in Ireland for over 30 years. We are fully committed to our significant local investment, which is more than €150 million to date,
and to our hundreds of colleagues based in Ireland.
As the company’s corporate headquarters
and with responsibility for global functions, including a manufacturing plant, global device engineering and a state-of-the-art research
and development facility, Mallinckrodt’s Blanchardstown, Dublin, facility is central to our mission.
We are also committed to the local community in
Dublin, where we have forged strong relationships over the years through our CSR programme. We have a long record of supporting a broad
range of charitable organisations, local philanthropic initiatives and team volunteering opportunities. In 2024 we announced a €50,000
partnership with SciFest, Ireland’s largest science, technology, engineering, and math (‘STEM’) fair programme for second-level
schools to promote these subjects and inspire young students to pursue future careers in STEM.
We look forward to continuing our local partnerships
in the years ahead.
If you wish to discuss this transaction in greater
detail, please let me know.
Yours sincerely,
Paul O’Neill
EVP, Quality & Operations (Speciality Brands)
Email: Paul.Oneill@mnk.com
About Mallinckrodt
Mallinckrodt is a global business consisting of
multiple wholly owned subsidiaries that develop, manufacture, market and distribute specialty pharmaceutical products and therapies. The
Company's Specialty Brands reportable segment's areas of focus include autoimmune and rare diseases in specialty areas like neurology,
rheumatology, hepatology, nephrology, pulmonology and ophthalmology; neonatal respiratory critical care therapies; and gastrointestinal
products. Its Specialty Generics reportable segment includes specialty generic drugs and active pharmaceutical ingredients. To learn more
about Mallinckrodt, visit www.mallinckrodt.com.
Mallinckrodt uses its website as a channel of
distribution of important company information, such as press releases, investor presentations and other financial information. It also
uses its website to expedite public access to time-critical information regarding the Company in advance of or in lieu of distributing
a press release or a filing with the U.S. Securities and Exchange Commission ("SEC") disclosing the same information.
Therefore, investors should look to the Investor Relations page of the website for important and time-critical information. Visitors to
the website can also register to receive automatic e-mail and other notifications alerting them when new information is made available
on the Investor Relations page of the website.
1 Pro forma net debt
/ 2025E pro forma Adjusted EBITDA per management guidance, including Year 1 synergies of $75 million (50% of expected annual pre-tax
run-rate synergies).

No Offer or Solicitation
This communication is not intended to and shall not constitute an offer
to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there
be any sale of securities in any jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification
under the securities laws of any such jurisdiction. No offering of securities shall be made, except by means of a prospectus meeting the
requirements of Section 10 of the Securities Act of 1933, as amended.
Additional Information about the Combination and Where to Find It
In connection with the proposed transaction, Mallinckrodt intends to
file with the U.S. Securities and Exchange Commission (“SEC”) a registration statement on Form S-4 that will include a joint
proxy statement of Mallinckrodt and Endo and that also constitutes a prospectus of Mallinckrodt ordinary shares. Each of Mallinckrodt
and Endo may also file other relevant documents with the SEC regarding the proposed transaction. This document is not a substitute for
the joint proxy statement/prospectus or registration statement or any other document that Mallinckrodt or Endo may file with the SEC.
The definitive joint proxy statement/prospectus (if and when available) will be mailed to shareholders of Mallinckrodt and Endo. INVESTORS
AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT, JOINT PROXY STATEMENT/PROSPECTUS, AND ANY OTHER RELEVANT DOCUMENTS
THAT MAY BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN
THEY BECOME AVAILABLE, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security
holders will be able to obtain free copies of the registration statement and joint proxy statement/prospectus (if and when available)
and other documents containing important information about Mallinckrodt, Endo, and the proposed transaction, once such documents are filed
with the SEC through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Mallinckrodt
will be available free of charge on Mallinckrodt’s website at https://ir.mallinckrodt.com. Copies of the documents filed with the
SEC by Endo will be available free of charge on Endo’s website at https://investor.endo.com.
Participants in the Solicitation of Proxies
Mallinckrodt, Endo, and certain of their respective directors, executive
officers, and other members of management and employees may be deemed to be participants in the solicitation of proxies in respect of
the proposed transaction. Information about the directors and executive officers of Mallinckrodt, including a description of their direct
or indirect interests, by security holdings or otherwise, is set forth in (i) Mallinckrodt’s proxy statement for its 2024 Annual
Meeting of Shareholders, which was filed with the SEC on April 15, 2024 (and which is available at https://www.sec.gov/Archives/edgar/data/1567892/000110465924046964/tm242936-1_def14a.htm),
including under the headings “Corporate Governance”, “Our Director Nominees,” “Board of Directors and Board
Committees,” “Compensation of Non-Employee Directors,” “Executive Officers” “Compensation of Executive
Officers,” “Pay Versus Performance,” “Security Ownership and Reporting,” “Equity Compensation Plan
Information” and “Proposals 1(A) Through 1(E): Election of Directors”, (ii) Mallinckrodt’s Annual Report on Form
10-K for the fiscal year ended December 29, 2023, which was filed with the SEC on March 26, 2024 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/1567892/000156789224000008/mnk-20231229.htm),
including under the headings “Item 10. Directors, Executive Officers and Corporate Governance”, “Item 11. Executive
Compensation”, “Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters”,
“Item 13. Certain Relationships and Related Transactions and Director Independence”, and (iii) to the extent holdings of Mallinckrodt’s
securities by its directors or executive officers have changed since the amounts set forth in Mallinckrodt’s proxy statement for
its 2024 Annual Meeting of Shareholders, such changes have been or will be reflected on Initial Statement of Beneficial Ownership of Securities
on Form 3, Statement of Changes in Beneficial Ownership on Form 4, or Annual Statement of Changes in Beneficial Ownership on Form 5 filed
with the SEC, which are available at EDGAR Search Results (https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001567892&type=&dateb=&owner=only&count=40&search_text=).
Information about the directors and executive officers of Endo, including
a description of their direct or indirect interests, by security holdings or otherwise, is set forth in (i) Endo’s registration
statement on Form S-1, which was filed with the SEC on July 31, 2024 (and which is available at https://www.sec.gov/Archives/edgar/data/2008861/000119312524185328/d15705ds1a.htm),
including under the headings “Management,” “Executive and Director Compensation of Endo International plc,” “Certain
Relationships and Related Party Transactions,” and “Principal and Registering Stockholders” and (ii) to the extent holdings
of Endo’s securities by its directors or executive officers have changed since the amounts set forth in Endo’s S-1 registration
statement, such changes have been or will be reflected on Initial Statement of Beneficial Ownership of Securities on Form 3, Statement
of Changes in Beneficial Ownership on Form 4, or Annual Statement of Changes in Beneficial Ownership on Form 5 filed with the SEC, which
are available at EDGAR Search Results (https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0002008861&type=&dateb=&owner=only&count=40&search_text=).
Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security
holdings or otherwise, will be contained in the definitive joint proxy statement/prospectus and will be contained in other relevant materials
to be filed with the SEC regarding the proposed transaction when such materials become available. Investors should read these materials
carefully before making any voting or investment decisions. You may obtain free copies of these documents from Mallinckrodt or Endo using
the sources indicated above.
1 Pro forma net debt
/ 2025E pro forma Adjusted EBITDA per management guidance, including Year 1 synergies of $75 million (50% of expected annual pre-tax
run-rate synergies).

Information Regarding Forward-Looking Statements
Statements in this communication that are not strictly historical (including,
among other things, statements regarding the proposed business combination transaction between Mallinckrodt and Endo, Mallinckrodt and
Endo’s plans to combine their generics pharmaceuticals businesses and Endo’s sterile injectables business after the close
of the proposed business combination and separate that business from the combined company at a later date, the anticipated benefits of
the proposed transactions, the anticipated impact of the proposed transactions on the combined company’s business and future financial
and operating results, the expected amount and timing of synergies from the proposed transactions, the anticipated closing date for the
proposed business combination transaction and any other statements regarding events or developments Mallinckrodt and Endo 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:
| (i) | transaction-related risks, including the parties’ ability
to successfully integrate our business and Endo’s business and unanticipated costs of such integration, which may result in the
combined company not operating as effectively and efficiently as expected; uncertainties related to a future separation of the combined
generics pharmaceuticals businesses of Mallinckrodt and Endo and Endo’s sterile injectables business; the risk that the expected
benefits and synergies of the proposed transactions may not be fully realized in a timely manner, or at all; the risk associated with
Mallinckrodt’s and Endo’s ability to obtain the approval of their shareholders and stockholders, respectively, required to
consummate the proposed business combination transaction; uncertainty regarding the timing of the closing of the proposed business combination
transaction; the risk that the conditions to the proposed business combination transaction may not be satisfied (or waived to the extent
permitted by law) on a timely basis or at all or the failure of the proposed business combination transaction to close for any other
reason or to close on the anticipated terms, including the intended tax treatment; the risk that any regulatory approval, consent or
authorization that may be required for the proposed business combination transaction may not be obtained or may be obtained subject to
conditions that are not anticipated; the occurrence of any event, change or other circumstance that could give rise to the termination
of the proposed business combination transaction; unanticipated difficulties, liabilities or expenditures relating to the proposed transactions;
the effect of the announcement, pendency or completion of the proposed transactions on the parties’ business relationships and
business operations generally; certain restrictions on the ability of Mallinckrodt and Endo to pursue certain business activities or
strategic transactions during the pendency of the proposed business combination transaction; the effect of the announcement, pendency
or completion of the proposed transactions on the long-term value of Mallinckrodt’s ordinary shares and Endo’s common stock;
risks that the proposed transactions may disrupt current plans and operations of Mallinckrodt and Endo and their respective management
teams and potential difficulties in hiring, retaining and motivating employees as a result of the proposed transactions; risks related
to our increased indebtedness as a result of the proposed business combination transaction; significant transaction costs related to
the proposed business combination transaction; potential litigation relating to the proposed transactions that could be instituted against
Mallinckrodt, Endo or their respective officers or directors; rating agency actions and Mallinckrodt’s and Endo’s ability
to access short- and long-term debt markets on a timely and affordable basis; and risks related to the financing in connection with the
transaction; |
| (ii) | risks related to Mallinckrodt’s business, including potential changes in Mallinckrodt’s business strategy and performance;
Mallinckrodt’s initiative to explore a variety of potential divestiture, financing and other transactional opportunities; the exercise
of contingent value rights by the Opioid Master Disbursement Trust II (the “Trust”); governmental investigations and inquiries,
regulatory actions, and lawsuits, in each case related to Mallinckrodt or its officers; Mallinckrodt’s contractual and court-ordered
compliance obligations that, if violated, could result in penalties; compliance with and restrictions under the global settlement to resolve
all opioid-related claims; matters related to Acthar Gel, including the settlement with governmental parties to resolve certain disputes
and compliance with and restrictions under the related corporate integrity agreement; the ability to maintain relationships with Mallinckrodt’s
suppliers, customers, employees and other third parties following the emergence from the 2023 bankruptcy proceedings; scrutiny from governments,
legislative bodies and enforcement agencies related to sales, marketing and pricing practices; pricing pressure on certain of Mallinckrodt’s
products due to legal changes or changes in insurers’ or other payers’ reimbursement practices resulting from recent increased
public scrutiny of healthcare and pharmaceutical costs; the reimbursement practices of governmental health administration authorities,
private health coverage insurers and other third-party payers; complex reporting and payment obligations under the Medicare and Medicaid
rebate programs and other governmental purchasing and rebate programs; cost containment efforts of customers, purchasing groups, third-party
payers and governmental organizations; changes in or failure to comply with relevant laws and regulations; any undesirable side effects
caused by Mallinckrodt’s approved and investigational products, which could limit their commercial profile or result in other negative
consequences; Mallinckrodt’s and its partners’ ability to successfully develop, commercialize or launch new products or expand
commercial opportunities of existing products, including Acthar Gel (repository corticotropin injection) SelfJect™ and the INOmax
Evolve DS delivery system; Mallinckrodt’s ability to successfully identify or discover additional products or product candidates;
Mallinckrodt’s ability to navigate price fluctuations and pressures, including the ability to achieve anticipated benefits of price
increases of its products; competition; Mallinckrodt’s ability to protect intellectual property rights, including in relation to
ongoing and future litigation; limited clinical trial data for Acthar Gel; the timing, expense and uncertainty associated with clinical
studies and related regulatory processes; product liability losses and other litigation liability; material health, safety and environmental
laws and related liabilities; business development activities or other strategic transactions; attraction and retention of key personnel;
the effectiveness of information technology infrastructure, including risks of external attacks or failures; customer concentration; Mallinckrodt’s
reliance on certain individual products that are material to its financial performance; Mallinckrodt’s ability to receive sufficient
procurement and production quotas granted by the U.S. Drug Enforcement Administration; complex manufacturing processes; reliance
on third-party manufacturers and supply chain providers and related market disruptions; conducting business internationally; Mallinckrodt’s
significant levels of intangible assets and related impairment testing; natural disasters or other catastrophic events; Mallinckrodt’s
substantial indebtedness and settlement obligation, its ability to generate sufficient cash to reduce its indebtedness and its potential
need and ability to incur further indebtedness; restrictions contained in the agreements governing Mallinckrodt’s indebtedness and
settlement obligation on Mallinckrodt’s operations, future financings and use of proceeds; Mallinckrodt’s variable rate indebtedness;
Mallinckrodt’s tax treatment by the Internal Revenue Service under Section 7874 and Section 382 of the Internal Revenue
Code of 1986, as amended; future changes to applicable tax laws or the impact of disputes with governmental tax authorities; the impact
of Irish laws; the impact on the holders of Mallinckrodt’s ordinary shares if Mallinckrodt were to cease to be a reporting company
in the United States; the comparability of Mallinckrodt’s post-emergence financial results and the projections filed with the Bankruptcy
Court; and the lack of comparability of Mallinckrodt’s historical financial statements and information contained in its financial
statements after the adoption of fresh-start accounting following emergence from the 2023 bankruptcy proceedings; and |
1 Pro forma net debt
/ 2025E pro forma Adjusted EBITDA per management guidance, including Year 1 synergies of $75 million (50% of expected annual pre-tax
run-rate synergies).

| (iii) | risks related to Endo’s business, including future capital
expenditures, expenses, revenues, economic performance, financial conditions, market growth and future prospects; Endo changes in competitive,
market or regulatory conditions; changes in legislation or regulations; global political changes, including those related to the new
U.S. presidential administration; Endo’s use of artificial intelligence and data science; the ability to obtain and maintain adequate
protection for intellectual property rights; the impacts of competition such as those related to XIAFLEX®; the timing
and uncertainty of the results of both the research and development and regulatory processes; health care and cost containment reforms,
including government pricing, tax and reimbursement policies; litigation; the performance including the approval, introduction and consumer
and physician acceptance of current and new products; the performance of third parties upon whom Endo relies for goods and services;
issues associated with Endo’s supply chain; Endo’s ability to develop and expand its product pipeline and to launch new products
and to continue to develop the market for XIAFLEX® and other branded, sterile injectable or generic products; the effectiveness
of advertising and other promotional campaigns; and the timely and successful implementation of business development opportunities and/or
any other strategic priorities. |
The registration statement on Form S-4 and proxy statement/prospectus
that will be filed with the Securities and Exchange Commission (the “SEC”) will describe additional risks in connection with
the proposed transaction. While the list of factors presented here is, and the list of factors to be presented in the registration statement
on Form S-4 and proxy statement/prospectus are, considered representative, no such list should be considered to be a complete statement
of all potential risks and uncertainties. For additional information about other factors that could cause actual results to differ materially
from those described in the forward-looking statements, please refer to Mallinckrodt’s most recent Annual Report on Form 10-K and
subsequent Quarterly Reports on Form 10-Q, and other filings with the SEC, which are available from the SEC’s website
(www.sec.gov) and Mallinckrodt’s website (www.mallinckrodt.com) and Endo’s most recent Annual Report on Form 10-K and subsequent
Quarterly Reports on Form 10-Q and other filings with the SEC, which are available from the SEC’s website (www.sec.gov)
and Endo’s website (www.endo.com). There may be other risks and uncertainties that we are unable to predict at this time or that
we currently do not expect to have a material adverse effect on our business.
The forward-looking statements made herein speak only as of the date
hereof and Mallinckrodt and Endo do not assume 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. Given these uncertainties, one should not put
undue reliance on any forward-looking statements.
Non-GAAP Financial Measures
To supplement the financial measures prepared in accordance with U.S.
generally accepted accounting principles (GAAP), this communication includes certain financial information of the combined company in
this release that are not prescribed by or prepared in accordance with GAAP. We utilize these non-GAAP financial measures as supplements
to financial measures determined in accordance with GAAP when evaluating operating performance and we believe that these measures will
be used by certain investors to evaluate operating results. We believe that presenting these non-GAAP financial measures provides useful
information about performance across reporting periods on a consistent basis by excluding certain items, which may be favorable or unfavorable.
Despite the importance of these measures to management in goal setting
and performance measurement, these are non-GAAP financial measures that have no standardized meaning prescribed by GAAP and, therefore,
have limits in their usefulness to investors. Because of the non-standardized definitions, non-GAAP adjusted EBITDA (unlike GAAP net income
and its components) may differ from, and may not be comparable to, the calculation of similar measures of other companies. These non-GAAP
financial measures are presented solely to permit investors to more fully understand how management assesses performance.
These non-GAAP financial measures should not be viewed in isolation
or as substitutes for, or superior to, financial measures calculated in accordance with GAAP. We are not providing reconciliations of
projected non-GAAP financial measures to GAAP financial measures, nor are we providing comparable projected GAAP financial measures for
such projected non-GAAP financial measures. We are unable to provide such reconciliations without unreasonable efforts due to the inherent
difficulty in forecasting and quantifying certain amounts that are necessary for such reconciliations, including adjustments that could
be made for asset impairments, contingent consideration adjustments, legal settlements, gain / loss on extinguishment of debt, adjustments
to inventory and other charges reflected in the reconciliation of historic numbers, the amounts of which could be significant.
1 Pro forma net debt
/ 2025E pro forma Adjusted EBITDA per management guidance, including Year 1 synergies of $75 million (50% of expected annual pre-tax
run-rate synergies).
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