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:

13 Aug 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:

22,397,590

3.85%

1,441,835

0.25%

(2)

Cash-settled derivatives:

1,348,210

0.23%

22,302,468

3.84%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

23,745,800

4.09%

23,744,303

4.09%

(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

944,687

1.9520 GBP

3 1/3p ordinary

Purchase

115,574

1.9573 GBP

3 1/3p ordinary

Purchase

37,750

1.9381 GBP

3 1/3p ordinary

Purchase

20,028

1.9560 GBP

3 1/3p ordinary

Purchase

18,176

1.9484 GBP

3 1/3p ordinary

Purchase

10,424

1.9680 GBP

3 1/3p ordinary

Purchase

9,679

1.9545 GBP

3 1/3p ordinary

Purchase

9,178

1.9553 GBP

3 1/3p ordinary

Purchase

4,294

1.9400 GBP

3 1/3p ordinary

Purchase

3,206

1.9570 GBP

3 1/3p ordinary

Purchase

2,472

1.9420 GBP

3 1/3p ordinary

Purchase

2,190

1.9440 GBP

3 1/3p ordinary

Purchase

1,580

1.9620 GBP

3 1/3p ordinary

Purchase

1,561

1.9460 GBP

3 1/3p ordinary

Purchase

1,454

1.9580 GBP

3 1/3p ordinary

Purchase

1,431

1.9500 GBP

3 1/3p ordinary

Purchase

1,340

1.9371 GBP

3 1/3p ordinary

Purchase

843

1.9380 GBP

3 1/3p ordinary

Purchase

637

1.9600 GBP

3 1/3p ordinary

Purchase

459

1.9480 GBP

3 1/3p ordinary

Purchase

426

1.9660 GBP

3 1/3p ordinary

Purchase

426

1.9700 GBP

3 1/3p ordinary

Purchase

343

1.9540 GBP

3 1/3p ordinary

Purchase

223

1.9640 GBP

3 1/3p ordinary

Purchase

184

1.9360 GBP

3 1/3p ordinary

Purchase

141

1.9590 GBP

3 1/3p ordinary

Purchase

100

1.9594 GBP

3 1/3p ordinary

Purchase

51

1.9515 GBP

3 1/3p ordinary

Sale

173,416

1.9592 GBP

3 1/3p ordinary

Sale

115,574

1.9573 GBP

3 1/3p ordinary

Sale

67,367

1.9562 GBP

3 1/3p ordinary

Sale

45,678

1.9560 GBP

3 1/3p ordinary

Sale

43,500

1.9538 GBP

3 1/3p ordinary

Sale

35,696

1.9544 GBP

3 1/3p ordinary

Sale

19,390

1.9600 GBP

3 1/3p ordinary

Sale

14,792

1.9504 GBP

3 1/3p ordinary

Sale

9,760

1.9511 GBP

3 1/3p ordinary

Sale

5,851

1.9580 GBP

3 1/3p ordinary

Sale

5,000

1.9526 GBP

3 1/3p ordinary

Sale

4,454

1.9455 GBP

3 1/3p ordinary

Sale

4,294

1.9400 GBP

3 1/3p ordinary

Sale

4,048

1.9471 GBP

3 1/3p ordinary

Sale

3,944

1.9477 GBP

3 1/3p ordinary

Sale

3,404

1.9559 GBP

3 1/3p ordinary

Sale

2,472

1.9420 GBP

3 1/3p ordinary

Sale

2,392

1.9460 GBP

3 1/3p ordinary

Sale

1,700

1.9652 GBP

3 1/3p ordinary

Sale

1,580

1.9620 GBP

3 1/3p ordinary

Sale

1,413

1.9380 GBP

3 1/3p ordinary

Sale

904

1.9440 GBP

3 1/3p ordinary

Sale

673

1.9500 GBP

3 1/3p ordinary

Sale

482

1.9497 GBP

3 1/3p ordinary

Sale

459

1.9480 GBP

3 1/3p ordinary

Sale

426

1.9700 GBP

3 1/3p ordinary

Sale

426

1.9660 GBP

3 1/3p ordinary

Sale

424

1.9680 GBP

3 1/3p ordinary

Sale

343

1.9540 GBP

3 1/3p ordinary

Sale

322

1.9520 GBP

3 1/3p ordinary

Sale

223

1.9640 GBP

3 1/3p ordinary

Sale

184

1.9360 GBP

3 1/3p ordinary

Sale

141

1.9590 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

4,445

1.9480 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,171

1.9381 GBP

3 1/3p ordinary

SWAP

Decreasing Short

831

1.9460 GBP

3 1/3p ordinary

SWAP

Decreasing Short

73

1.9499 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,792

1.9504 GBP

3 1/3p ordinary

SWAP

Decreasing Short

137

1.9525 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,000

1.9526 GBP

3 1/3p ordinary

SWAP

Decreasing Short

435

1.9533 GBP

3 1/3p ordinary

SWAP

Decreasing Short

43,500

1.9538 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,404

1.9559 GBP

3 1/3p ordinary

SWAP

Decreasing Short

17,882

1.9560 GBP

3 1/3p ordinary

SWAP

Decreasing Short

43,500

1.9562 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,996

1.9580 GBP

3 1/3p ordinary

SWAP

Decreasing Short

173,416

1.9592 GBP

3 1/3p ordinary

SWAP

Decreasing Short

21,250

1.9602 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,340

1.9371 GBP

3 1/3p ordinary

SWAP

Increasing Short

37,750

1.9381 GBP

3 1/3p ordinary

SWAP

Increasing Short

131

1.9454 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,084

1.9471 GBP

3 1/3p ordinary

SWAP

Increasing Short

613

1.9480 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,312

1.9516 GBP

3 1/3p ordinary

SWAP

Increasing Short

944,365

1.9520 GBP

3 1/3p ordinary

SWAP

Increasing Short

387

1.9529 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,832

1.9560 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,206

1.9570 GBP

3 1/3p ordinary

SWAP

Increasing Short

100

1.9594 GBP

3 1/3p ordinary

SWAP

Increasing Short

213

1.9603 GBP

3 1/3p ordinary

CFD

Decreasing Short

16,012

1.9485 GBP

3 1/3p ordinary

CFD

Increasing Short

7,481

1.9519 GBP

3 1/3p ordinary

CFD

Increasing Short

4,999

1.9561 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:

14 Aug 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213