Senior Regulatory News (SNR)

FORM 8.5 (EPT/NON-RI)

PUBLIC OPENING POSITION DISCLOSURE/DEALING DISCLOSURE BY AN

EXEMPT PRINCIPAL TRADER WITHOUT RECOGNISED INTERMEDIARY ("RI") STATUS

(OR WHERE RI STATUS IS NOT APPLICABLE)

Rule 8.5 of the Takeover Code (the "Code")

1.

KEY INFORMATION

(a)

Name of exempt principal trader:

BARCLAYS CAPITAL SECURITIES LTD

(b)

Name of offeror/offeree in relation to whose

SENIOR PLC

relevant securities this form relates:

(c)

Name of the party to the offer with which exempt

ZEUS UK BIDCO LIMITED (A NEWLY FORMED COMPANY TO BE INDIRECTLY CONTROLLED BY INVESTMENT FUNDS ADVISED BY AFFILIATES OF TINICUM INCORPORATED AND BLACKSTONE INC.)

principal trader is connected

(d)

Date position held/dealing undertaken:

20 May 2026

(e)

In addition to the company in 1(b) above, is the exempt principal

NO

trader making disclosures in respect of any other party to the offer?

2.

POSITIONS OF THE EXEMPT PRINCIPAL TRADER

(a)

Interests and short positions in the relevant securities of the offeror or offeree

to which the disclosure relates following the dealing (if any)

Class of relevant security:

10p ordinary

Interests

Short Positions

Number

(%)

Number

(%)

(1)

Relevant securities owned

and/or controlled:

22,881,642

5.46%

4,275,524

1.02%

(2)

Cash-settled derivatives:

and/or controlled:

4,200,017

1.00%

22,880,069

5.46%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

27,081,659

6.46%

27,155,593

6.47%

(b)

Rights to subscribe for new securities (including directors and other executive

options)

Class of relevant security in relation to

which subscription right exists

Details, including nature of the rights

concerned and relevant percentages:

3.

DEALINGS (IF ANY) BY THE EXEMPT PRINCIPAL TRADER

(a)

Purchases and sales

Class of relevant

Purchase/sale

Total number of

Highest price per unit

Lowest price per unit

security

securities

paid/received

paid/received

10p ordinary

Purchase

1,931,232

2.8650 GBP

2.8498 GBP

10p ordinary

Sale

560,376

2.8552 GBP

2.8500 GBP

(b)

Cash-settled derivative transactions

Class of

Product

Nature of dealing

Number of

Price per

relevant

description

reference

unit

security

securities

10p ordinary

SWAP

Decreasing Short

165,446

2.8500 GBP

10p ordinary

SWAP

Decreasing Short

9,686

2.8502 GBP

10p ordinary

SWAP

Decreasing Short

351

2.8529 GBP

10p ordinary

SWAP

Decreasing Short

200

2.8549 GBP

10p ordinary

SWAP

Decreasing Short

1,981

2.8550 GBP

10p ordinary

SWAP

Decreasing Short

3,400

2.8551 GBP

10p ordinary

SWAP

Decreasing Short

24,706

2.8552 GBP

10p ordinary

SWAP

Increasing Short

422,751

2.8500 GBP

10p ordinary

SWAP

Increasing Short

6,394

2.8502 GBP

10p ordinary

SWAP

Increasing Short

1,000,000

2.8533 GBP

10p ordinary

SWAP

Increasing Short

5,845

2.8550 GBP

10p ordinary

SWAP

Increasing Short

3,856

2.8552 GBP

10p ordinary

SWAP

Increasing Short

25,913

2.8553 GBP

10p ordinary

SWAP

Increasing Short

195

2.8560 GBP

10p ordinary

SWAP

Increasing Short

27,020

2.8575 GBP

10p ordinary

SWAP

Increasing Short

35,320

2.8600 GBP

10p ordinary

SWAP

Increasing Short

88,672

2.8638 GBP

10p ordinary

SWAP

Increasing Short

10,398

2.8650 GBP

10p ordinary

CFD

Increasing Long

65,192

2.8548 GBP

10p ordinary

CFD

Decreasing Long

11,056

2.8601 GBP

(c)

Stock-settled derivative transactions (including options)

(i)

Writing, selling, purchasing or varying

Class

Product

Writing,

Number

Exercise

Type

Expiry

Option

of

description

purchasing,

of

price

date

money

relevant

selling,

securities

per unit

paid/

security

varying etc

to which

received

option

per unit

relates

(ii)

Exercising

Class of relevant

Product description

Exercising/ exercised against

Number of

Exercise price per

security

securities

unit

(d)

Other dealings (including subscribing for new securities)

Class of relevant

Nature of Dealings

Details

Price per unit (if

security

applicable)

4.

OTHER INFORMATION

(a)

Indemnity and other dealings 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 exempt principal trader making the disclosure and any party

to the offer or any person acting in concert with a party to the offer:

NONE

(b)

Agreements, arrangements or understandings relating to options or derivatives

Details of any agreement, arrangement or understanding, formal or informal, between

the exempt principal trader making the disclosure and any other person relating to:

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

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

any derivative is referenced:

NONE

(c)

Attachments

Is a Supplemental Form 8 (Open Positions) attached?

NO

Date of disclosure:

21 May 2026

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213