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:

29 Apr 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:

41,177,293

7.09%

2,370,106

0.41%

(2)

Cash-settled derivatives:

and/or controlled:

1,617,151

0.28%

40,839,383

7.03%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

42,794,444

7.36%

43,209,489

7.44%

(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

196,768

1.8485 GBP

3 1/3p ordinary

Purchase

119,626

1.8492 GBP

3 1/3p ordinary

Purchase

93,711

1.8394 GBP

3 1/3p ordinary

Purchase

51,871

1.8397 GBP

3 1/3p ordinary

Purchase

48,346

1.8462 GBP

3 1/3p ordinary

Purchase

24,954

1.8409 GBP

3 1/3p ordinary

Purchase

21,050

1.8415 GBP

3 1/3p ordinary

Purchase

16,926

1.8444 GBP

3 1/3p ordinary

Purchase

9,413

1.8490 GBP

3 1/3p ordinary

Purchase

8,277

1.8400 GBP

3 1/3p ordinary

Purchase

8,065

1.8489 GBP

3 1/3p ordinary

Purchase

2,768

1.8480 GBP

3 1/3p ordinary

Purchase

2,624

1.8493 GBP

3 1/3p ordinary

Purchase

2,377

1.8487 GBP

3 1/3p ordinary

Purchase

2,107

1.8503 GBP

3 1/3p ordinary

Purchase

1,828

1.8479 GBP

3 1/3p ordinary

Purchase

1,808

1.8506 GBP

3 1/3p ordinary

Purchase

1,197

1.8380 GBP

3 1/3p ordinary

Purchase

1,003

1.8399 GBP

3 1/3p ordinary

Purchase

941

1.8440 GBP

3 1/3p ordinary

Sale

63,486

1.8473 GBP

3 1/3p ordinary

Sale

54,306

1.8412 GBP

3 1/3p ordinary

Sale

30,480

1.8400 GBP

3 1/3p ordinary

Sale

14,992

1.8454 GBP

3 1/3p ordinary

Sale

13,838

1.8337 GBP

3 1/3p ordinary

Sale

9,527

1.8438 GBP

3 1/3p ordinary

Sale

8,766

1.8424 GBP

3 1/3p ordinary

Sale

6,383

1.8336 GBP

3 1/3p ordinary

Sale

6,012

1.8384 GBP

3 1/3p ordinary

Sale

5,067

1.8389 GBP

3 1/3p ordinary

Sale

4,382

1.8425 GBP

3 1/3p ordinary

Sale

4,260

1.8480 GBP

3 1/3p ordinary

Sale

3,704

1.8405 GBP

3 1/3p ordinary

Sale

3,238

1.8434 GBP

3 1/3p ordinary

Sale

3,035

1.8444 GBP

3 1/3p ordinary

Sale

1,713

1.8401 GBP

3 1/3p ordinary

Sale

1,452

1.8320 GBP

3 1/3p ordinary

Sale

30

1.8440 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

28,373

1.8400 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,327

1.8401 GBP

3 1/3p ordinary

SWAP

Decreasing Short

15,451

1.8424 GBP

3 1/3p ordinary

SWAP

Decreasing Short

9,527

1.8438 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,992

1.8454 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,015

1.8471 GBP

3 1/3p ordinary

SWAP

Decreasing Short

57,306

1.8477 GBP

3 1/3p ordinary

SWAP

Decreasing Short

755

1.8480 GBP

3 1/3p ordinary

SWAP

Increasing Short

231

1.8380 GBP

3 1/3p ordinary

SWAP

Increasing Short

51,871

1.8397 GBP

3 1/3p ordinary

SWAP

Increasing Short

20,289

1.8400 GBP

3 1/3p ordinary

SWAP

Increasing Short

10,267

1.8427 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,236

1.8454 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,400

1.8468 GBP

3 1/3p ordinary

SWAP

Increasing Short

196,767

1.8485 GBP

3 1/3p ordinary

SWAP

Increasing Short

9,413

1.8490 GBP

3 1/3p ordinary

SWAP

Increasing Short

113,401

1.8492 GBP

3 1/3p ordinary

SWAP

Increasing Short

1

1.8500 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,808

1.8506 GBP

3 1/3p ordinary

SWAP

Increasing Short

597

1.8601 GBP

3 1/3p ordinary

CFD

Decreasing Short

2,107

1.8500 GBP

3 1/3p ordinary

CFD

Decreasing Short

2,107

1.8502 GBP

3 1/3p ordinary

CFD

Increasing Short

2,490

1.8420 GBP

3 1/3p ordinary

CFD

Increasing Short

37,258

1.8471 GBP

3 1/3p ordinary

CFD

Increasing Short

2,107

1.8500 GBP

3 1/3p ordinary

CFD

Increasing Short

2,107

1.8502 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:

30 Apr 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213