Form 8 OPD - System1 Group plc

(a) Full name of discloser:

System1 Group plc

(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

System1 Group plc

(d) Is the discloser the offeror or the offeree?

Offeree

(e) Date position held:

The latest practicable date prior to the disclosure

14 July 2026

(f)  In addition to the company in 1(c) above, is the discloser making disclosures in respect of any other party to the offer?

If it is a cash offer or possible cash offer, state "N/A"

No

Class of relevant security:

1p ordinary

Interests

Short positions

Number

%

Number

%

(1) Relevant securities owned and/or controlled:

Nil

0

Nil

0

(2) Cash-settled derivatives:

Nil

0

Nil

0

(3) Stock-settled derivatives (including options) and agreements to purchase/sell:

Nil

0

Nil

0

     TOTAL:

Nil

0

Nil

0

Class of relevant security in relation to which subscription right exists:

Nil

Details, including nature of the rights concerned and relevant percentages:

Nil

Details of any interests, short positions and rights to subscribe (including directors' and other employee options) of any person acting in concert with the party to the offer making the disclosure:

Holdings of ordinary shares by the directors of the Offeree and their close relatives:

¹ Lewis Robinson has an interest in System1 Group plc via Crucible Clarity Fund. Crucible Clarity Fund is managed by Crucible Management Limited and Lewis Robinson is on the Board of Directors that control voting, acceptance and trading decisions.

The following Directors of the Offeree hold rights to subscribe for the following relevant Offeree securities:

*Options awarded by the remuneration committee. The award is not subject to performance criteria but vest subject to Mr Gregory's continued employment in the Offeree.

**Options awarded by remuneration committee. The LTIP award is subject to performance criteria which will be disclosed within the Offeree's 2026 Annual Report.

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 party to the offer making the disclosure or any person acting in concert with it:

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

None

Details of any agreement, arrangement or understanding, formal or informal, between the party to the offer making the disclosure, or any person acting in concert with it, and any other person relating to:

(i)  the voting rights of any relevant securities under any option; or

(ii) the voting rights or future acquisition or disposal of any relevant securities to which any derivative is referenced:

If there are no such agreements, arrangements or understandings, state "none"

None

Supplemental Form 8 (Open Positions)

No

Supplemental Form 8 (SBL)

No

Date of disclosure:

15 July 2026

Contact name:

Chris Willford

Telephone number:

07467 990147