Form 8.3 Horizon Therapeutics Plc

LONDON, January 18, 2023–(BUSINESS WIRE)–

FORM 8.3

IRISH TAKEOVER PERSONEL

OPENING POSITION DISCLOSURE/DEALING DISCLOSURE UNDER RULE 8.3 IRISH TAKEOVER ACT, 1997, TAKEOVER

RULES 2022 BY PERSONS INTERESTED IN RELEVANT SECURITIES REPRESENTING 1.1% OR MORE

1. KEY INFORMATION

(a) Full name of the discloser

Balyasny Asset Management LP

(b) Owner/controller of interests and short Positions disclosed, if any are different from 1(a).

Names of nominees or vehicle companies are insufficient. Settlor, trustee and settlor are responsible for trust administration. Names of beneficiaries are required

(c) Name of the offeror/offeree with respect to whom This form refers to relevant securities

Each offeror/offeree should have its own form

Horizon Therapeutics plc

(d) An exempt fund manager who is connected to an Offeror/offeree: Please state the identity and provide details Offeror/offeree (Note 1)

(e) Date position held/dealing undertaken

Declare the following for an opening position disclosure Prior to disclosure, the most recent practicable date

17/01/2023

(f) Additional to the company described in 1(c), the following is also applicable: Disclosures made by the discloser in respect of any other party to this offer?

State whether it’s a cash offer or a possible cash offer. “N/A”

N/A

2. SHORT POSITIONS & INTERESTS

If there are interest or short positions that you wish to disclose in more than one type of relevant securities offered by the offeror/offeree listed in 1(c), please copy table 2.

Short positions and interests in the securities of the offeror/offee to whom the disclosure refers following the deal (if applicable)

(Note 2)

Security classification
(Note 3)

$0.0001 Ordinary Shares

ISIN: IE00BQPVQZ61

Interests

Positions for the short term

Number

%

Number

%

(1) Relevant securities that are owned or controlled

1,549,443

0.68

8,243

0.00

(2) Cash-settled derivatives

(3) Stock-settled derivatives (includes options) Agreements to purchase/ Sell

2,974,700

1.31

2,241,800

0.99

Total

4,524,143

1.99

2,250,043

0.99

All short positions and any interests must be disclosed.

On a Supplemental Form 8, you should include details of all options, including the rights to subscribe to new securities and any open stock settled derivative positions (including traded option), as well as agreements to buy or sell relevant securities.

3. DEALINGS (IF ANY) BY THE PERSON MAKING THE DISCLOSURE (Note 4)

Where dealings have taken place in more than one relevant class of securities of the offeror/offeree mentioned in 1(c), copy tableau 3(a), [b], (c), or (d), as appropriate, for each additional class.

It is necessary to indicate the currency used for all prices and other amounts.

(a) Sales and purchases

Type of relevant
Security

Purchase/sale

Number of
Securities

Price per unit
(Note 5)

$0.0001 Ordinary Shares

Sale

1

USD 113.12

$0.0001 Ordinary Shares

Purchase

5,859

USD 113.14

$0.0001 Ordinary Shares

Sale

78

USD 113.12

$0.0001 Ordinary Shares

Purchase

11,673

USD 113.10

$0.0001 Ordinary Shares

Purchase

25,000

USD 113.12

(b) Cash-settled derivative transactions

Type of
Relevant
Security

Product
Description
e.g. CFD

Nature of dealing
e.g. opening/ Close a long/ Position in the short term Increase/ decrease a short/ long position

Number of
Refer to
Securities
(Note 6)

Prices
per unit
(Note 5)

(c) Stock-settled derivatives transactions (including options).

(i) Writing, selling, buying, or varying.

Type of
Relevant
Security

Product
Description e.g. Call
Option

Writing, purchasing, selling, Variable
etc.

Number
This is
Securities
Which
Option
Related
(Note 6)

Exercise
price per
Unit

Type
e.g.
American,
European
etc.

Expiry
Date

Option
Money
paid/
Received per unit

(ii) Exercise

Type of
Relevant
Security

Product
Description
e.g. Call
Option

Exercising/
Exercised
Against

Number of
Securities

Exercise
price per
Unit
(Note 5)

(d) Other transactions (including transactions in relation to new securities). (Note 3)

Type of
Relevant
Security

Nature of dealing
e.g. subscription,
conversion, exercise

Details

Price per unit (if
applicable)
(Note 5)

4. Other Information

(a) Other dealing arrangements and indemnity

Details about any indemnity arrangement or option arrangement or any other agreement Understanding and communication, formal and informal, regarding relevant securities This could be used to incentivize or discourage you from doing business Signed by the person disclosing and any party to Offer or any person acting in concert to a party to it.

You should not include irrevocable commitments, letters of intent, or other forms of intension. If These agreements, arrangements and understandings are not available to the state “none”

(b) Agreements, arrangements and understandings regarding options or derivatives

Details of any agreement, arrangement, or understanding Between the disclosing person and any other person to the voting rights of any relevant security under any option Referred to on this form or relating the future voting rights Any relevant securities that are acquired or sold Referred to in this form as derivative If none, It is important to mention.

(c) Attachments

Is there a Supplemental 8?

Yes

Date of disclosure

18/01/2023

Contact name

Dina Guirguis

Phone number

+44 207 149 0000

Public disclosures pursuant to Rule 8.3 of these Rules must be made through a Regulatory Information Service.

NOTES ON THE FORM 8.3

1. Refer to Rule 2.2 of Part B of the Rules for the definition of “connected funds manager”.

2. Refer to Rule 2.5 of Part A for the definition of “interest of a relevant security” and Rule 8.6(a), (b) of Section B of the Rules.

3. See Rule 2.1 of Part B of the Rules for the definitions of “relevant securities”.

4. You can find the definition of dealing in Rule 2.1 of Part B of the Rules.

5. Please provide all details if your economic exposure to price changes of securities is reduced, for instance, through a stop loss agreement relating to a spread wager.

6. Refer to Rule 2.5(d), in Part A, of the Rules.

7. Incorrect details should be corrected in any subsequent disclosure. The disclosure should clearly state that it corrects information disclosed previously, identify any disclosures being corrected and give sufficient detail for the reader’s understanding of the nature of the corrections. The Panel should be consulted in case of doubt.

The Rules contain detailed information on disclosure requirements. See Rule 8 for details. Consult the Panel if you are unsure.

These notes refer to “the Rules”, which are the Irish Takeover Panel Act 1997, Takeover Rules 2022.

SUPPLEMENTAL FORM 8

IRISH TAKEOVER PRESENTATION PANEL

DISCLOSE UNDER RULE 8(1), RULE 8.3, and RULE 38.5(b).

RULE 38.6 IRISH TAKEOVER PANEL ACT 1997

TAKEOVER REGULATIONS, 2022

DETAILS ABOUT OPEN STOCK-SETTLED DIIVATIVE (INCLUDING

OPTION) POSITIONS AND AGREEMENTS TO PURCHASE / SELL AND

RIGHTS TO SUBSCRIBE FOR NEW SECURITIES

1. KEY INFORMATION

Full name of person who made the announcement
disclosure:

Balyasny Asset Management LP

Name of offeror/offeree
To whose securities are relevant
Disclosure refers:

Horizon Therapeutics plc

2. STOCK-SETTLED DEIVATIVES (INCLUDING OPTIONS)

Type of
Relevant
Security

Product
Description
e.g. Call
Option

Written or
Purchase

Number of
Securities
Which option?
or derivative
Related

Exercise
Price
per unit

Type
e.g.
American,
European
etc.

Expiry
Date

$0.0001 Ordinary Shares

Call Option

Purchased

2,056,600

USD 115

American

20/01/23

$0.0001 Ordinary Shares

Place Option

Purchased

300,000

USD 110

American

20/01/23

$0.0001 Ordinary Shares

Place Option

Purchased

291,800

USD 70

American

20/01/23

$0.0001 Ordinary Shares

Place Option

Purchased

130,000

USD 75

American

20/01/23

$0.0001 Ordinary Shares

Call Option

Written

770,000

USD 115

American

17/02/23

$0.0001 Ordinary Shares

Call Option

Purchased

2,400

USD 115

American

17/02/23

$0.0001 Ordinary Shares

Call Option

Purchased

165,700

USD 120

American

17/02/23

$0.0001 Ordinary Shares

Place Option

Written

750,000

USD 80

American

19/05/23

$0.0001 Ordinary Shares

Place Option

Purchased

750,000

USD 90

American

19/05/23

3. AGREEMENTS FOR PURCHASE AND SELL

Please give all details so that we can understand the nature of your interest. It is possible to fully understand your position:

4. RIGHTS TO SUBSCRIBE FOR NEW SECURITIES (INCLUDING DIRECTORS’ AND OTHER EMPLOYEE OPTIONS)

In which security category is it relevant? Refer to which subscription right exists:

Details, including the nature and origin of the Rights concerned and pertinent percentages:

You don’t need to fill out a Supplemental form with details about cash-settled derivatives.

It is necessary to indicate the currency used for all prices and other amounts.

The Rules contain detailed information on disclosure requirements. See Rule 8 for details. Consult the Panel if you are unsure.

These notes refer to “the Rules”, which are the Irish Takeover Panel Act 1997, Takeover Rules 2022.

Businesswire.com – View the source version https://www.businesswire.com/news/home/20230118005601/en/

Contacts

Balyasny Asset Management LP

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