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:

04 Sep 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:

19,918,876

3.43%

7,399,722

1.27%

(2)

Cash-settled derivatives:

7,286,562

1.25%

19,842,510

3.41%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

27,205,438

4.68%

27,242,232

4.69%

(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 PERSON MAKING THE DISCLOSURE

(a)

Purchases and sales

Class of relevant

Purchase/sale

Number of

Price per unit

security

securities

3 1/3p ordinary

Purchase

48,001

1.9453 GBP

3 1/3p ordinary

Purchase

48,001

1.9464 GBP

3 1/3p ordinary

Purchase

18,167

1.9466 GBP

3 1/3p ordinary

Purchase

17,160

1.9421 GBP

3 1/3p ordinary

Purchase

16,342

1.9490 GBP

3 1/3p ordinary

Purchase

16,030

1.9439 GBP

3 1/3p ordinary

Purchase

11,331

1.9493 GBP

3 1/3p ordinary

Purchase

8,076

1.9497 GBP

3 1/3p ordinary

Purchase

4,898

1.9564 GBP

3 1/3p ordinary

Purchase

4,872

1.9484 GBP

3 1/3p ordinary

Purchase

4,545

1.9420 GBP

3 1/3p ordinary

Purchase

4,445

1.9461 GBP

3 1/3p ordinary

Purchase

3,213

1.9500 GBP

3 1/3p ordinary

Purchase

2,946

1.9452 GBP

3 1/3p ordinary

Purchase

2,651

1.9580 GBP

3 1/3p ordinary

Purchase

2,583

1.9480 GBP

3 1/3p ordinary

Purchase

1,996

1.9440 GBP

3 1/3p ordinary

Purchase

1,937

1.9300 GBP

3 1/3p ordinary

Purchase

1,629

1.9460 GBP

3 1/3p ordinary

Purchase

1,248

1.9520 GBP

3 1/3p ordinary

Purchase

1,034

1.9470 GBP

3 1/3p ordinary

Purchase

1,004

1.9579 GBP

3 1/3p ordinary

Purchase

617

1.9340 GBP

3 1/3p ordinary

Purchase

548

1.9540 GBP

3 1/3p ordinary

Purchase

71

1.9560 GBP

3 1/3p ordinary

Purchase

3

1.9600 GBP

3 1/3p ordinary

Sale

1,317,623

1.9300 GBP

3 1/3p ordinary

Sale

112,331

1.9566 GBP

3 1/3p ordinary

Sale

92,230

1.9442 GBP

3 1/3p ordinary

Sale

66,158

1.9495 GBP

3 1/3p ordinary

Sale

47,350

1.9458 GBP

3 1/3p ordinary

Sale

40,755

1.9445 GBP

3 1/3p ordinary

Sale

23,430

1.9502 GBP

3 1/3p ordinary

Sale

21,347

1.9461 GBP

3 1/3p ordinary

Sale

10,715

1.9418 GBP

3 1/3p ordinary

Sale

5,058

1.9492 GBP

3 1/3p ordinary

Sale

4,545

1.9420 GBP

3 1/3p ordinary

Sale

4,377

1.9580 GBP

3 1/3p ordinary

Sale

2,538

1.9449 GBP

3 1/3p ordinary

Sale

2,037

1.9500 GBP

3 1/3p ordinary

Sale

1,903

1.9480 GBP

3 1/3p ordinary

Sale

1,860

1.9436 GBP

3 1/3p ordinary

Sale

1,629

1.9460 GBP

3 1/3p ordinary

Sale

1,248

1.9520 GBP

3 1/3p ordinary

Sale

1,127

1.9440 GBP

3 1/3p ordinary

Sale

617

1.9340 GBP

3 1/3p ordinary

Sale

548

1.9540 GBP

3 1/3p ordinary

Sale

145

1.9522 GBP

3 1/3p ordinary

Sale

71

1.9560 GBP

3 1/3p ordinary

Sale

3

1.9600 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

1,315,686

1.9300 GBP

3 1/3p ordinary

SWAP

Decreasing Short

741

1.9356 GBP

3 1/3p ordinary

SWAP

Decreasing Short

10,715

1.9418 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,651

1.9420 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,860

1.9436 GBP

3 1/3p ordinary

SWAP

Decreasing Short

60,128

1.9437 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13,054

1.9442 GBP

3 1/3p ordinary

SWAP

Decreasing Short

38,907

1.9445 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,363

1.9447 GBP

3 1/3p ordinary

SWAP

Decreasing Short

47,522

1.9458 GBP

3 1/3p ordinary

SWAP

Decreasing Short

21,347

1.9461 GBP

3 1/3p ordinary

SWAP

Decreasing Short

12,944

1.9474 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,058

1.9492 GBP

3 1/3p ordinary

SWAP

Decreasing Short

66,158

1.9495 GBP

3 1/3p ordinary

SWAP

Decreasing Short

11,030

1.9498 GBP

3 1/3p ordinary

SWAP

Decreasing Short

12,400

1.9505 GBP

3 1/3p ordinary

SWAP

Decreasing Short

401

1.9507 GBP

3 1/3p ordinary

SWAP

Decreasing Short

826

1.9550 GBP

3 1/3p ordinary

SWAP

Decreasing Short

403,683

1.9566 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,563

1.9420 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,934

1.9421 GBP

3 1/3p ordinary

SWAP

Increasing Short

869

1.9440 GBP

3 1/3p ordinary

SWAP

Increasing Short

48,001

1.9453 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,445

1.9461 GBP

3 1/3p ordinary

SWAP

Increasing Short

48,001

1.9465 GBP

3 1/3p ordinary

SWAP

Increasing Short

13,985

1.9468 GBP

3 1/3p ordinary

SWAP

Increasing Short

34,571

1.9470 GBP

3 1/3p ordinary

SWAP

Increasing Short

680

1.9480 GBP

3 1/3p ordinary

SWAP

Increasing Short

11,331

1.9493 GBP

3 1/3p ordinary

SWAP

Increasing Short

8,076

1.9497 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,467

1.9505 GBP

3 1/3p ordinary

SWAP

Increasing Short

354

1.9541 GBP

3 1/3p ordinary

SWAP

Increasing Short

291,352

1.9560 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,898

1.9564 GBP

3 1/3p ordinary

SWAP

Increasing Short

650

1.9600 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)

Exercise

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:

05 Sep 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213