Form 8.3 SPIRENT COMMUNICATIONS PLC

FORM 8.3

PUBLIC OPENING POSITION DISCLOSURE/DEALING DISCLOSURE BY

A PERSON WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR

MORE

Rule 8.3 of the Takeover Code (the "Code")

1.

KEY INFORMATION

(a)

Full name of discloser:

Barclays PLC.

(b)

Owner or controller of interest and short

positions disclosed, if different from 1(a):

(c)

Name of offeror/offeree in relation to whose

SPIRENT COMMUNICATIONS PLC

relevant securities this form relates:

(d)

If an exempt fund manager connected with an

offeror/offeree, state this and specify identity of

offeror/offeree:

(e)

Date position held/dealing undertaken:

31 Jul 2025

(f)

In addition to the company in 1(c) above, is the discloser making

NO

disclosures in respect of any other party to the offer?

2.

POSITIONS OF THE PERSON MAKING THE DISCLOSURE

(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:

3 1/3p ordinary

Interests

Short Positions

Number

(%)

Number

(%)

(1)

Relevant securities owned

and/or controlled:

23,095,091

3.97%

1,149,084

0.20%

(2)

Cash-settled derivatives:

and/or controlled:

1,069,771

0.18%

22,816,449

3.93%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

24,164,862

4.16%

23,965,533

4.12%

(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

Number of

Price per unit

security

securities

3 1/3p ordinary

Purchase

1,016,299

1.9560 GBP

3 1/3p ordinary

Purchase

99,495

1.9531 GBP

3 1/3p ordinary

Purchase

63,610

1.9509 GBP

3 1/3p ordinary

Purchase

28,713

1.9530 GBP

3 1/3p ordinary

Purchase

27,854

1.9500 GBP

3 1/3p ordinary

Purchase

19,357

1.9491 GBP

3 1/3p ordinary

Purchase

9,996

1.9544 GBP

3 1/3p ordinary

Purchase

9,468

1.9567 GBP

3 1/3p ordinary

Purchase

7,285

1.9538 GBP

3 1/3p ordinary

Purchase

6,614

1.9480 GBP

3 1/3p ordinary

Purchase

5,042

1.9501 GBP

3 1/3p ordinary

Purchase

4,426

1.9534 GBP

3 1/3p ordinary

Purchase

4,281

1.9515 GBP

3 1/3p ordinary

Purchase

4,201

1.9540 GBP

3 1/3p ordinary

Purchase

4,175

1.9539 GBP

3 1/3p ordinary

Purchase

2,624

1.9520 GBP

3 1/3p ordinary

Purchase

2,591

1.9510 GBP

3 1/3p ordinary

Purchase

2,547

1.9570 GBP

3 1/3p ordinary

Purchase

1,939

1.9580 GBP

3 1/3p ordinary

Purchase

904

1.9541 GBP

3 1/3p ordinary

Purchase

547

1.9559 GBP

3 1/3p ordinary

Sale

125,953

1.9500 GBP

3 1/3p ordinary

Sale

44,477

1.9545 GBP

3 1/3p ordinary

Sale

17,351

1.9493 GBP

3 1/3p ordinary

Sale

10,504

1.9560 GBP

3 1/3p ordinary

Sale

8,912

1.9480 GBP

3 1/3p ordinary

Sale

4,713

1.9547 GBP

3 1/3p ordinary

Sale

3,755

1.9568 GBP

3 1/3p ordinary

Sale

3,706

1.9546 GBP

3 1/3p ordinary

Sale

3,573

1.9519 GBP

3 1/3p ordinary

Sale

3,380

1.9540 GBP

3 1/3p ordinary

Sale

3,281

1.9535 GBP

3 1/3p ordinary

Sale

2,624

1.9520 GBP

3 1/3p ordinary

Sale

2,424

1.9559 GBP

3 1/3p ordinary

Sale

2,115

1.9499 GBP

3 1/3p ordinary

Sale

1,863

1.9580 GBP

3 1/3p ordinary

Sale

387

1.9570 GBP

3 1/3p ordinary

Sale

230

1.9510 GBP

(b)

Cash-settled derivative transactions

Class of

Product

Nature of dealing

Number of

Price per

relevant

description

reference

unit

security

securities

3 1/3p ordinary

SWAP

Decreasing Short

17,351

1.9493 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,115

1.9499 GBP

3 1/3p ordinary

SWAP

Decreasing Short

28,114

1.9500 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,649

1.9511 GBP

3 1/3p ordinary

SWAP

Decreasing Short

25,916

1.9521 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,879

1.9523 GBP

3 1/3p ordinary

SWAP

Decreasing Short

8,209

1.9525 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,161

1.9555 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,424

1.9559 GBP

3 1/3p ordinary

SWAP

Increasing Short

19,357

1.9491 GBP

3 1/3p ordinary

SWAP

Increasing Short

19,357

1.9499 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,132

1.9500 GBP

3 1/3p ordinary

SWAP

Increasing Short

21,147

1.9501 GBP

3 1/3p ordinary

SWAP

Increasing Short

525

1.9515 GBP

3 1/3p ordinary

SWAP

Increasing Short

830

1.9518 GBP

3 1/3p ordinary

SWAP

Increasing Short

7,429

1.9524 GBP

3 1/3p ordinary

SWAP

Increasing Short

26,850

1.9530 GBP

3 1/3p ordinary

SWAP

Increasing Short

19,464

1.9531 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,785

1.9541 GBP

3 1/3p ordinary

SWAP

Increasing Short

17,573

1.9555 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,007,622

1.9560 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,100

1.9561 GBP

3 1/3p ordinary

SWAP

Increasing Short

990

1.9580 GBP

3 1/3p ordinary

CFD

Decreasing Short

2,222

1.9508 GBP

3 1/3p ordinary

CFD

Increasing Short

36,822

1.9550 GBP

3 1/3p ordinary

CFD

Increasing Short

10,756

1.9555 GBP

3 1/3p ordinary

SWAP

Decreasing Short

54,432

1.9536 GBP

3 1/3p ordinary

SWAP

Increasing Short

47,972

1.9553 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 person 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:

01 Aug 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213