HZNP Horizon Therapeutics Public Limited Company

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 27, 2023

Horizon Therapeutics Public Limited Company

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: 011-353-1-772-2100

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Set forth below are the results of the matters submitted for a vote of shareholders at our 2023 Annual General Meeting of Shareholders held on July 27, 2023.

Proposal 1 — Election of directors.

The following directors were elected to serve for three-year terms expiring at the 2026 Annual General Meeting of Shareholders and until their respective successors are duly elected and qualified, or, if sooner, until the respective director’s death, resignation, disqualification or removal.

Proposal 2 — Approval of the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2023 and the authorization of the Audit Committee of our Board of Directors to determine the auditors’ remuneration.

Proposal 3 — Approval, on an advisory basis, of the compensation of our named executive officers.

FURTHER INFORMATION

Statement Required by the Irish Takeover Rules

The directors of Horizon accept responsibility for the information contained in this report. To the best of the knowledge and belief of the directors of Horizon (who have taken all reasonable care to ensure that such is the case), the information contained in this report is in accordance with the facts and does not omit anything likely to affect the import of such information.

Dealing Disclosure Requirements

Under the provisions of Rule 8.3(b) of the Irish Takeover Rules, if any person is, or becomes, ‘interested’ in 1% or more of any class of ‘relevant securities’ of the Company, that person must publicly disclose all ‘dealings’ in any ‘relevant securities’ of the Company during the ‘offer period’, by not later than 3:30 p.m. (E.T.) on the ‘business day’ following the date of the relevant transaction.

If two or more persons co-operate on the basis of any agreement either express or tacit, either oral or written, to acquire an ‘interest’ in ‘relevant securities’ of the Company or any securities exchange offeror, they will be deemed to be a single person for the purpose of Rule 8.3 of the Irish Takeover Rules.

In addition, each of the Company and any offeror must make an ‘opening position disclosure’ by no later than 12:00 noon (E.T.) on the date falling ten ‘business days’ following the commencement of the ‘offer period’ or the announcement that first identifies a securities exchange offeror, as applicable, and disclose details of any ‘dealings’ by it or any person ‘acting in concert’ with it in ‘relevant securities’ during the ‘offer period’, by no later than 12:00 noon (E.T.) on the business day following the date of the transaction (see Rules 8.1, 8.2 and 8.4 of the Irish Takeover Rules).

A disclosure table, giving details of the companies in whose ‘relevant securities’ ‘opening position’ and ‘dealings’ should be disclosed can be found on the Irish Takeover Panel’s website at www.irishtakeoverpanel.ie.

‘Interests’ in securities arise, in summary, when a person has long economic exposure, whether conditional or absolute, to changes in the price of securities. In particular, a person will be treated as having an ‘interest’ by virtue of the ownership or control of securities, or by virtue of any option in respect of, or derivative referenced to, securities.

Terms in quotation marks are defined in the Irish Takeover Rules, which can be found on the Irish Takeover Panel’s website. If you are in any doubt as to whether or not you are required to disclose an ‘opening position’ or ‘dealing’ under Rule 8 of the Irish Takeover Rules, please consult the Irish Takeover Panel’s website at www.irishtakeoverpanel.ie or contact the Irish Takeover Panel on telephone number +353 1 678 9020.

Rounding

Certain figures included in this report have been subjected to rounding adjustments. Accordingly, any figures shown for the same category presented in different tables may vary slightly and figures shown as totals in certain tables may not be an arithmetic aggregation of the figures that precede them.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.