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:

28 May 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:

45,757,365

7.87%

2,019,372

0.35%

(2)

Cash-settled derivatives:

and/or controlled:

1,880,136

0.32%

45,437,575

7.82%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

47,637,501

8.20%

47,456,947

8.17%

(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

20,131

1.9300 GBP

3 1/3p ordinary

Purchase

16,458

1.9302 GBP

3 1/3p ordinary

Purchase

12,339

1.9287 GBP

3 1/3p ordinary

Purchase

9,307

1.9297 GBP

3 1/3p ordinary

Purchase

5,788

1.9324 GBP

3 1/3p ordinary

Purchase

2,475

1.9370 GBP

3 1/3p ordinary

Purchase

1,553

1.9342 GBP

3 1/3p ordinary

Purchase

1,484

1.9295 GBP

3 1/3p ordinary

Purchase

1,359

1.9380 GBP

3 1/3p ordinary

Purchase

1,349

1.9320 GBP

3 1/3p ordinary

Purchase

1,330

1.9310 GBP

3 1/3p ordinary

Purchase

1,255

1.9240 GBP

3 1/3p ordinary

Purchase

1,187

1.9400 GBP

3 1/3p ordinary

Purchase

777

1.9323 GBP

3 1/3p ordinary

Purchase

625

1.9372 GBP

3 1/3p ordinary

Purchase

483

1.9260 GBP

3 1/3p ordinary

Purchase

390

1.9360 GBP

3 1/3p ordinary

Purchase

290

1.9340 GBP

3 1/3p ordinary

Purchase

189

1.9356 GBP

3 1/3p ordinary

Sale

21,239

1.9298 GBP

3 1/3p ordinary

Sale

5,477

1.9300 GBP

3 1/3p ordinary

Sale

2,277

1.9320 GBP

3 1/3p ordinary

Sale

2,093

1.9333 GBP

3 1/3p ordinary

Sale

1,219

1.9239 GBP

3 1/3p ordinary

Sale

1,073

1.9400 GBP

3 1/3p ordinary

Sale

868

1.9270 GBP

3 1/3p ordinary

Sale

779

1.9370 GBP

3 1/3p ordinary

Sale

770

1.9280 GBP

3 1/3p ordinary

Sale

396

1.9380 GBP

3 1/3p ordinary

Sale

325

1.9283 GBP

3 1/3p ordinary

Sale

243

1.9317 GBP

3 1/3p ordinary

Sale

190

1.9340 GBP

3 1/3p ordinary

Sale

189

1.9360 GBP

3 1/3p ordinary

Sale

22

1.9250 GBP

3 1/3p ordinary

Sale

10

1.9350 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

6,126

1.9300 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,219

1.9239 GBP

3 1/3p ordinary

SWAP

Decreasing Short

325

1.9283 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,343

1.9299 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,318

1.9306 GBP

3 1/3p ordinary

SWAP

Increasing Short

700

1.9257 GBP

3 1/3p ordinary

SWAP

Increasing Short

150

1.9280 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,719

1.9295 GBP

3 1/3p ordinary

SWAP

Increasing Short

11,714

1.9300 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,521

1.9307 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,180

1.9314 GBP

3 1/3p ordinary

SWAP

Increasing Short

777

1.9323 GBP

3 1/3p ordinary

SWAP

Increasing Short

100

1.9340 GBP

3 1/3p ordinary

SWAP

Increasing Short

625

1.9372 GBP

3 1/3p ordinary

CFD

Decreasing Short

1

1.9300 GBP

3 1/3p ordinary

CFD

Increasing Short

2,088

1.9241 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:

29 May 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213