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:

23 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:

44,708,518

7.69%

2,043,431

0.35%

(2)

Cash-settled derivatives:

and/or controlled:

1,883,755

0.32%

44,396,763

7.64%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

46,592,273

8.02%

46,440,194

7.99%

(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

74,625

1.9283 GBP

3 1/3p ordinary

Purchase

69,521

1.9343 GBP

3 1/3p ordinary

Purchase

62,187

1.9281 GBP

3 1/3p ordinary

Purchase

19,498

1.9380 GBP

3 1/3p ordinary

Purchase

19,302

1.9274 GBP

3 1/3p ordinary

Purchase

17,193

1.9306 GBP

3 1/3p ordinary

Purchase

14,802

1.9247 GBP

3 1/3p ordinary

Purchase

1,682

1.9381 GBP

3 1/3p ordinary

Purchase

1,590

1.9350 GBP

3 1/3p ordinary

Purchase

1,399

1.9284 GBP

3 1/3p ordinary

Purchase

836

1.9400 GBP

3 1/3p ordinary

Purchase

657

1.9300 GBP

3 1/3p ordinary

Purchase

657

1.9320 GBP

3 1/3p ordinary

Purchase

587

1.9329 GBP

3 1/3p ordinary

Purchase

108

1.9205 GBP

3 1/3p ordinary

Purchase

6

1.9359 GBP

3 1/3p ordinary

Purchase

6

1.9360 GBP

3 1/3p ordinary

Sale

1,000,000

1.9199 GBP

3 1/3p ordinary

Sale

1,000,000

1.9188 GBP

3 1/3p ordinary

Sale

33,633

1.9243 GBP

3 1/3p ordinary

Sale

10,515

1.9380 GBP

3 1/3p ordinary

Sale

9,967

1.9322 GBP

3 1/3p ordinary

Sale

6,009

1.9379 GBP

3 1/3p ordinary

Sale

3,777

1.9337 GBP

3 1/3p ordinary

Sale

3,111

1.9225 GBP

3 1/3p ordinary

Sale

2,662

1.9385 GBP

3 1/3p ordinary

Sale

1,434

1.9355 GBP

3 1/3p ordinary

Sale

1,294

1.9382 GBP

3 1/3p ordinary

Sale

1,076

1.9240 GBP

3 1/3p ordinary

Sale

1,040

1.9347 GBP

3 1/3p ordinary

Sale

763

1.9160 GBP

3 1/3p ordinary

Sale

723

1.9400 GBP

3 1/3p ordinary

Sale

433

1.9360 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

6,242

1.9328 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,000,000

1.9188 GBP

3 1/3p ordinary

SWAP

Decreasing Short

16,073

1.9194 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,000,000

1.9199 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,111

1.9225 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,949

1.9239 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,000,000

1.9299 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,551

1.9305 GBP

3 1/3p ordinary

SWAP

Decreasing Short

9,967

1.9322 GBP

3 1/3p ordinary

SWAP

Decreasing Short

234

1.9342 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,467

1.9351 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,760

1.9380 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,662

1.9385 GBP

3 1/3p ordinary

SWAP

Increasing Short

22

1.9203 GBP

3 1/3p ordinary

SWAP

Increasing Short

86

1.9206 GBP

3 1/3p ordinary

SWAP

Increasing Short

14,802

1.9247 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,694

1.9280 GBP

3 1/3p ordinary

SWAP

Increasing Short

62,187

1.9281 GBP

3 1/3p ordinary

SWAP

Increasing Short

74,625

1.9283 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,000,000

1.9288 GBP

3 1/3p ordinary

SWAP

Increasing Short

384

1.9300 GBP

3 1/3p ordinary

SWAP

Increasing Short

604

1.9308 GBP

3 1/3p ordinary

SWAP

Increasing Short

23,537

1.9318 GBP

3 1/3p ordinary

SWAP

Increasing Short

69,521

1.9343 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,841

1.9347 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,590

1.9350 GBP

3 1/3p ordinary

SWAP

Increasing Short

15

1.9360 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,018

1.9361 GBP

3 1/3p ordinary

SWAP

Increasing Short

346

1.9380 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,682

1.9381 GBP

3 1/3p ordinary

CFD

Decreasing Short

1,300

1.9258 GBP

3 1/3p ordinary

CFD

Increasing Short

3,975

1.9345 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:

27 May 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213