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:

27 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:

29,602,293

5.09%

2,126,450

0.37%

(2)

Cash-settled derivatives:

and/or controlled:

1,723,693

0.30%

29,110,892

5.01%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

31,325,986

5.39%

31,237,342

5.38%

(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

153,604

1.9413 GBP

3 1/3p ordinary

Purchase

76,802

1.9363 GBP

3 1/3p ordinary

Purchase

63,031

1.9468 GBP

3 1/3p ordinary

Purchase

61,786

1.9471 GBP

3 1/3p ordinary

Purchase

57,349

1.9480 GBP

3 1/3p ordinary

Purchase

38,716

1.9474 GBP

3 1/3p ordinary

Purchase

31,926

1.9483 GBP

3 1/3p ordinary

Purchase

17,745

1.9482 GBP

3 1/3p ordinary

Purchase

13,902

1.9463 GBP

3 1/3p ordinary

Purchase

5,504

1.9438 GBP

3 1/3p ordinary

Purchase

4,960

1.9486 GBP

3 1/3p ordinary

Purchase

2,977

1.9500 GBP

3 1/3p ordinary

Purchase

1,791

1.9506 GBP

3 1/3p ordinary

Purchase

690

1.9499 GBP

3 1/3p ordinary

Purchase

380

1.9490 GBP

3 1/3p ordinary

Purchase

152

1.9440 GBP

3 1/3p ordinary

Purchase

57

1.9540 GBP

3 1/3p ordinary

Sale

76,802

1.9413 GBP

3 1/3p ordinary

Sale

38,500

1.9446 GBP

3 1/3p ordinary

Sale

37,000

1.9476 GBP

3 1/3p ordinary

Sale

35,863

1.9480 GBP

3 1/3p ordinary

Sale

23,759

1.9481 GBP

3 1/3p ordinary

Sale

17,842

1.9502 GBP

3 1/3p ordinary

Sale

3,249

1.9463 GBP

3 1/3p ordinary

Sale

3,035

1.9470 GBP

3 1/3p ordinary

Sale

2,380

1.9442 GBP

3 1/3p ordinary

Sale

2,032

1.9465 GBP

3 1/3p ordinary

Sale

1,632

1.9443 GBP

3 1/3p ordinary

Sale

765

1.9420 GBP

3 1/3p ordinary

Sale

695

1.9500 GBP

3 1/3p ordinary

Sale

681

1.9461 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

4,934

1.9460 GBP

3 1/3p ordinary

SWAP

Decreasing Short

76,802

1.9413 GBP

3 1/3p ordinary

SWAP

Decreasing Short

765

1.9420 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,632

1.9443 GBP

3 1/3p ordinary

SWAP

Decreasing Short

38,500

1.9446 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,437

1.9460 GBP

3 1/3p ordinary

SWAP

Decreasing Short

681

1.9461 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,249

1.9463 GBP

3 1/3p ordinary

SWAP

Decreasing Short

796

1.9466 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,051

1.9470 GBP

3 1/3p ordinary

SWAP

Decreasing Short

37,000

1.9476 GBP

3 1/3p ordinary

SWAP

Decreasing Short

26,879

1.9480 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,375

1.9486 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5

1.9499 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3

1.9500 GBP

3 1/3p ordinary

SWAP

Decreasing Short

15,526

1.9505 GBP

3 1/3p ordinary

SWAP

Increasing Short

76,802

1.9363 GBP

3 1/3p ordinary

SWAP

Increasing Short

153,604

1.9413 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,889

1.9437 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,504

1.9438 GBP

3 1/3p ordinary

SWAP

Increasing Short

15,452

1.9458 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,100

1.9461 GBP

3 1/3p ordinary

SWAP

Increasing Short

6,165

1.9471 GBP

3 1/3p ordinary

SWAP

Increasing Short

76,682

1.9474 GBP

3 1/3p ordinary

SWAP

Increasing Short

18,050

1.9477 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,343

1.9478 GBP

3 1/3p ordinary

SWAP

Increasing Short

62,439

1.9480 GBP

3 1/3p ordinary

SWAP

Increasing Short

26,001

1.9481 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,374

1.9483 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,353

1.9484 GBP

3 1/3p ordinary

SWAP

Increasing Short

82

1.9485 GBP

3 1/3p ordinary

SWAP

Increasing Short

7,600

1.9492 GBP

3 1/3p ordinary

CFD

Increasing Short

15,769

1.9466 GBP

3 1/3p ordinary

CFD

Increasing Short

25,205

1.9470 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 Jun 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213