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:

20 Jun 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:

28,969,487

4.98%

1,915,879

0.33%

(2)

Cash-settled derivatives:

and/or controlled:

1,823,340

0.31%

28,816,933

4.96%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

30,792,827

5.30%

30,732,812

5.29%

(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

250,000

1.9188 GBP

3 1/3p ordinary

Purchase

235,272

1.9257 GBP

3 1/3p ordinary

Purchase

145,036

1.9260 GBP

3 1/3p ordinary

Purchase

50,000

1.9221 GBP

3 1/3p ordinary

Purchase

48,001

1.9183 GBP

3 1/3p ordinary

Purchase

35,094

1.9223 GBP

3 1/3p ordinary

Purchase

34,560

1.9258 GBP

3 1/3p ordinary

Purchase

20,591

1.9206 GBP

3 1/3p ordinary

Purchase

19,153

1.9215 GBP

3 1/3p ordinary

Purchase

12,752

1.9261 GBP

3 1/3p ordinary

Purchase

11,978

1.9305 GBP

3 1/3p ordinary

Purchase

7,648

1.9237 GBP

3 1/3p ordinary

Purchase

3,343

1.9189 GBP

3 1/3p ordinary

Purchase

2,499

1.9179 GBP

3 1/3p ordinary

Purchase

1,916

1.9210 GBP

3 1/3p ordinary

Purchase

1,000

1.9180 GBP

3 1/3p ordinary

Purchase

850

1.9160 GBP

3 1/3p ordinary

Purchase

532

1.9181 GBP

3 1/3p ordinary

Sale

500,000

1.9168 GBP

3 1/3p ordinary

Sale

251,288

1.9199 GBP

3 1/3p ordinary

Sale

250,000

1.9188 GBP

3 1/3p ordinary

Sale

200,000

1.9181 GBP

3 1/3p ordinary

Sale

164,086

1.9254 GBP

3 1/3p ordinary

Sale

122,916

1.9253 GBP

3 1/3p ordinary

Sale

59,411

1.9260 GBP

3 1/3p ordinary

Sale

14,515

1.9167 GBP

3 1/3p ordinary

Sale

8,855

1.9184 GBP

3 1/3p ordinary

Sale

3,973

1.9179 GBP

3 1/3p ordinary

Sale

943

1.9170 GBP

3 1/3p ordinary

Sale

926

1.9217 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

250,000

1.9119 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,515

1.9167 GBP

3 1/3p ordinary

SWAP

Decreasing Short

500,000

1.9168 GBP

3 1/3p ordinary

SWAP

Decreasing Short

943

1.9170 GBP

3 1/3p ordinary

SWAP

Decreasing Short

203

1.9178 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,973

1.9179 GBP

3 1/3p ordinary

SWAP

Decreasing Short

8,855

1.9184 GBP

3 1/3p ordinary

SWAP

Decreasing Short

250,000

1.9188 GBP

3 1/3p ordinary

SWAP

Decreasing Short

251,288

1.9199 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,121

1.9200 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,142

1.9207 GBP

3 1/3p ordinary

SWAP

Decreasing Short

7,666

1.9259 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,428

1.9260 GBP

3 1/3p ordinary

SWAP

Increasing Short

250,000

1.9108 GBP

3 1/3p ordinary

SWAP

Increasing Short

20

1.9160 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,599

1.9180 GBP

3 1/3p ordinary

SWAP

Increasing Short

512

1.9182 GBP

3 1/3p ordinary

SWAP

Increasing Short

48,001

1.9183 GBP

3 1/3p ordinary

SWAP

Increasing Short

250,000

1.9188 GBP

3 1/3p ordinary

SWAP

Increasing Short

20,591

1.9206 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,916

1.9210 GBP

3 1/3p ordinary

SWAP

Increasing Short

15,432

1.9212 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,825

1.9219 GBP

3 1/3p ordinary

SWAP

Increasing Short

50,000

1.9221 GBP

3 1/3p ordinary

SWAP

Increasing Short

133,215

1.9252 GBP

3 1/3p ordinary

SWAP

Increasing Short

17,046

1.9260 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,752

1.9261 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,823

1.9267 GBP

3 1/3p ordinary

CFD

Decreasing Short

9,583

1.9200 GBP

3 1/3p ordinary

CFD

Decreasing Short

13,011

1.9258 GBP

3 1/3p ordinary

CFD

Increasing Short

8,262

1.9252 GBP

3 1/3p ordinary

SWAP

Increasing Long

200,000

1.9182 GBP

3 1/3p ordinary

SWAP

Decreasing Long

11,978

1.9306 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:

23 Jun 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213