National Storage Mechanism | Additional information

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FORM 8.3

IRISH TAKEOVER PANEL

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

RULES, 2022 BY PERSONS WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR MORE

1. KEY INFORMATION

(a) Full name of discloser	Citadel Group
(b) Owner or controller of interests and short positions disclosed, if different from 1(a) The naming of nominee or vehicle companies is insufficient. For a trust, the trustee(s), settlor and beneficiaries must be named.	N/A
(c) Name of offeror/offeree in relation to whose relevant securities this form relates Use a separate form for each offeror/offeree	HORIZON THERAPEUTICS PLC
(d) If an exempt fund manager connected with an offeror/offeree, state this and specify identity of offeror/offeree (Note 1)	N/A
(e) Date position held/dealing undertaken For an opening position disclosure, state the latest practicable date prior to the disclosure	26 June 2023
(f) In addition to the company in 1(c) above, is the discloser also making disclosures in respect of any other party to the offer? If it is a cash offer or possible cash offer, state "N/A"	N/A

2. INTERESTS AND SHORT POSITIONS

If there are interests and short positions to disclose in more than one class of relevant securities of the offeror or offeree named in 1(c), copy table 2 for each additional class of relevant security.

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Interests and short positions in the relevant securities of the offeror or offeree to which the disclosure relates following the dealing (if any)

(Note 2)

Class of relevant security (Note 3)	Common Stock ISIN IE00BQPVQZ61
	Interests		Short positions
	Number	%	Number	%
(1) Relevant securities owned and/or controlled	4,461,687	1.95	130,973	0.05
(2) Cash-settled derivatives	0	0.00	0	0.00
(3) Stock-settled derivatives (including options) and agreements to purchase/ sell	1,612,500	0.70	1,479,500	0.64
Total	6,074,187	2.65	1,610,473	0.70

All interests and all short positions should be disclosed.

Details of options including rights to subscribe for new securities and any open stock-settled derivative positions (including traded options), or agreements to purchase or sell relevant securities, should be given on a Supplemental Form 8.

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

Where there have been dealings in more than one class of relevant securities of the offeror or offeree named in 1(c), copy table 3(a), (b), (c) or (d) (as appropriate) for each additional class of relevant security dealt in.

The currency of all prices and other monetary amounts should be stated.

(a) Purchases and sales

Class of relevant security	Purchase/sale	Number of securities	Price per unit (Note 5)
Common	Buy Transaction	105	102.0600 USD
Common	Buy Transaction	202	102.0941 USD
Common	Buy Transaction	889	102.1342 USD
Common	Buy Transaction	280	102.2507 USD
Common	Buy Transaction	181	102.2509 USD
Common	Buy Transaction	39,045	102.4616 USD
Common	Buy Transaction	50,000	102.4981 USD
Common	Sell Transaction	100	102.1200 USD
Common	Sell Transaction	11	102.2000 USD
Common	Sell Transaction	37	102.2251 USD
Common	Sell Transaction	40	102.2387 USD
Common	Sell Transaction	21	102.2443 USD
Common	Sell Transaction	3	102.3033 USD
Common	Sell Transaction	300	102.3367 USD
Common	Sell Transaction	250	102.3480 USD
Common	Sell Transaction	5,665	102.3950 USD
Common	Sell Transaction	1,216	102.3964 USD
Common	Sell Transaction	2,377	102.4033 USD
Common	Sell Transaction	1,113	102.4034 USD
Common	Sell Transaction	237	102.4037 USD
Common	Sell Transaction	468	102.4091 USD
Common	Sell Transaction	89	102.4124 USD
Common	Sell Transaction	420	102.4171 USD
Common	Sell Transaction	1,430	102.4253 USD
Common	Sell Transaction	310	102.4260 USD
Common	Sell Transaction	484	102.4268 USD
Common	Sell Transaction	25	102.4274 USD
Common	Sell Transaction	617	102.4281 USD
Common	Sell Transaction	129	102.4291 USD
Common	Sell Transaction	177	102.4303 USD
Common	Sell Transaction	115	102.4308 USD
Common	Sell Transaction	12	102.4317 USD
Common	Sell Transaction	70	102.4384 USD
Common	Sell Transaction	65	102.4464 USD
Common	Sell Transaction	131	102.4468 USD
Common	Sell Transaction	759	102.4473 USD
Common	Sell Transaction	1,605	102.4479 USD
Common	Sell Transaction	347	102.4480 USD
Common	Sell Transaction	115	102.4488 USD
Common	Sell Transaction	133	102.4495 USD
Common	Sell Transaction	197	102.4499 USD
Common	Sell Transaction	192	102.4500 USD
Common	Sell Transaction	536	102.4502 USD
Common	Sell Transaction	548	102.4505 USD
Common	Sell Transaction	454	102.4508 USD
Common	Sell Transaction	98	102.4513 USD
Common	Sell Transaction	32	102.4519 USD
Common	Sell Transaction	53	102.4543 USD
Common	Sell Transaction	18	102.4569 USD
Common	Sell Transaction	1,136	102.4613 USD
Common	Sell Transaction	349	102.4613 USD
Common	Sell Transaction	248	102.4625 USD
Common	Sell Transaction	60	102.4640 USD
Common	Sell Transaction	172	102.4645 USD
Common	Sell Transaction	143	102.4650 USD
Common	Sell Transaction	37	102.4654 USD
Common	Sell Transaction	63	102.4656 USD
Common	Sell Transaction	267	102.4671 USD
Common	Sell Transaction	661	102.4678 USD
Common	Sell Transaction	778	102.4686 USD
Common	Sell Transaction	143	102.4687 USD
Common	Sell Transaction	286	102.4705 USD
Common	Sell Transaction	171	102.4708 USD
Common	Sell Transaction	6	102.4717 USD
Common	Sell Transaction	15	102.4722 USD
Common	Sell Transaction	223	102.4741 USD
Common	Sell Transaction	1,180	102.4745 USD
Common	Sell Transaction	1,783	102.4746 USD
Common	Sell Transaction	5,419	102.4755 USD
Common	Sell Transaction	32	102.4761 USD
Common	Sell Transaction	644	102.4916 USD
Common	Sell Transaction	477	102.4916 USD
Common	Sell Transaction	99	102.4924 USD
Common	Sell Transaction	163	102.4936 USD
Common	Sell Transaction	272	102.4947 USD
Common	Sell Transaction	47	102.5024 USD
Common	Sell Transaction	216	102.5025 USD
Common	Sell Transaction	137	102.5025 USD
Common	Sell Transaction	6	102.5100 USD
Common	Sell Transaction	105	102.5600 USD

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(b) Cash-settled derivative transactions

Class of
relevant
security

Product
description
e.g. CFD

Nature of dealing
e.g. opening/ closing a long/ short position, increasing/ reducing a long/ short position

Number of
reference
securities
(Note 6)

Price
per unit
(Note 5)

(i) Writing, selling, purchasing or varying

Class of
relevant
security

Product
description e.g. call
option

Writing, purchasing, selling, varying
etc.

Number
of
securities
to which
option
relates
(Note 6)

Exercise
price per
unit

Type
e.g.
American,
European
etc.

Expiry
date

Option
money
paid/
received per unit

(ii) Exercise

Class of
relevant
security

Product
description
e.g. call
option

Exercising/
exercised
against

Number of
securities

Exercise
price per
unit
(Note 5)

(d) Other dealings (including transactions in respect of new securities) (Note 3)

Class of relevant security	Nature of dealing e.g. subscription, conversion, exercise	Details	Price per unit (if applicable) (Note 5)

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4. OTHER INFORMATION

(a) Indemnity and other dealing arrangements

Details of any indemnity or option arrangement, or any agreement or understanding, formal or informal, relating to relevant securities which may be an inducement to deal or refrain from dealing entered into by the person making the disclosure and any party to the offer or any person acting in concert with a party to the offer.

Irrevocable commitments and letters of intent should not be included. If there are no such agreements, arrangements or understandings, state "none"

None

(b) Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated.

None

Is a Supplemental Form 8 attached?

YES

Date of disclosure	27 June 2023
Contact name	Paula Sharp
Telephone number	020 7645 9700

Public disclosures under Rule 8.3 of the Rules must be made to a Regulatory Information Service.

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SUPPLEMENTAL FORM 8

IRISH TAKEOVER PANEL

DISCLOSURE UNDER RULE 8.1, RULE 8.3, RULE 38.5(b) AND
RULE 38.6 OF THE IRISH TAKEOVER PANEL ACT, 1997,
TAKEOVER RULES, 2022

DETAILS OF OPEN STOCK-SETTLED DERIVATIVE (INCLUDING
OPTION) POSITIONS, AGREEMENTS TO PURCHASE OR SELL AND
RIGHTS TO SUBSCRIBE FOR NEW SECURITIES

1. KEY INFORMATION

Full name of person making disclosure:	Citadel Group
Name of offeror/offeree in relation to whose relevant securities the disclosure relates:	HORIZON THERAPEUTICS PLC

2. STOCK-SETTLED DERIVATIVES (INCLUDING OPTIONS)

Class of relevant security	Product description e.g. call option	Written or purchased	Number of securities to which option or derivative relates	Exercise price per unit	Type e.g. American, European etc.	Expiry date
Common	Put Option	Purchased	-74,700	100.0 USD	American	18/08/2023
Common	Put Option	Purchased	-42,400	85.0 USD	American	18/08/2023
Common	Put Option	Purchased	-18,700	80.0 USD	American	18/08/2023
Common	Put Option	Purchased	-280,000	80.0 USD	American	15/12/2023
Common	Call Option	Purchased	50,000	115.0 USD	American	18/08/2023
Common	Put Option	Purchased	-15,000	90.0 USD	American	18/08/2023
Common	Put Option	Purchased	-62,500	70.0 USD	American	19/01/2024
Common	Call Option	Purchased	11,100	105.0 USD	American	18/08/2023
Common	Call Option	Sold	-5,000	120.0 USD	American	18/08/2023
Common	Put Option	Sold	100	65.0 USD	American	21/07/2023
Common	Put Option	Sold	62,500	90.0 USD	American	19/01/2024
Common	Put Option	Sold	280,000	90.0 USD	American	21/07/2023
Common	Put Option	Sold	779,900	95.0 USD	American	18/08/2023
Common	Put Option	Sold	32,800	55.0 USD	American	17/11/2023
Common	Put Option	Sold	4,400	60.0 USD	American	18/08/2023
Common	Call Option	Sold	-12,000	100.0 USD	American	21/07/2023
Common	Put Option	Sold	52,000	55.0 USD	American	15/09/2023
Common	Put Option	Sold	700	50.0 USD	American	19/01/2024
Common	Put Option	Sold	338,300	100.0 USD	American	21/07/2023
Common	Call Option	Sold	-269,200	105.0 USD	American	21/07/2023
Common	Put Option	Sold	700	60.0 USD	American	17/11/2023
Common	Call Option	Sold	-700,000	110.0 USD	American	18/08/2023

3. AGREEMENTS TO PURCHASE OR SELL

Full details should be given so that the nature of the interest or position can be fully understood:

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

Class of relevant security in relation to which subscription right exists:
Details, including nature of the rights concerned and relevant percentages:

It is not necessary to provide details on a Supplemental Form with regard to cash-settled derivatives.

The currency of all prices and other monetary amounts should be stated.

For full details of disclosure requirements, see Rule 8 of the Rules. If in doubt, consult the Panel.

References in these notes to "the Rules" are to the Irish Takeover Panel Act, 1997, Takeover Rules, 2022.