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:

01 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:

42,961,476

7.39%

1,488,984

0.26%

(2)

Cash-settled derivatives:

and/or controlled:

577,382

0.10%

42,700,637

7.35%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

43,538,858

7.49%

44,189,621

7.60%

(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

283,324

1.8814 GBP

3 1/3p ordinary

Purchase

67,842

1.8836 GBP

3 1/3p ordinary

Purchase

31,085

1.8831 GBP

3 1/3p ordinary

Purchase

24,966

1.8826 GBP

3 1/3p ordinary

Purchase

22,487

1.8821 GBP

3 1/3p ordinary

Purchase

19,883

1.8802 GBP

3 1/3p ordinary

Purchase

10,048

1.8806 GBP

3 1/3p ordinary

Purchase

9,090

1.8811 GBP

3 1/3p ordinary

Purchase

8,261

1.8840 GBP

3 1/3p ordinary

Purchase

6,771

1.8838 GBP

3 1/3p ordinary

Purchase

6,523

1.8817 GBP

3 1/3p ordinary

Purchase

5,315

1.8823 GBP

3 1/3p ordinary

Purchase

2,734

1.8824 GBP

3 1/3p ordinary

Purchase

2,203

1.8813 GBP

3 1/3p ordinary

Purchase

1,099

1.8816 GBP

3 1/3p ordinary

Purchase

795

1.8830 GBP

3 1/3p ordinary

Purchase

752

1.8820 GBP

3 1/3p ordinary

Purchase

699

1.8860 GBP

3 1/3p ordinary

Sale

170,182

1.8790 GBP

3 1/3p ordinary

Sale

115,726

1.8799 GBP

3 1/3p ordinary

Sale

107,064

1.8838 GBP

3 1/3p ordinary

Sale

29,937

1.8810 GBP

3 1/3p ordinary

Sale

29,551

1.8788 GBP

3 1/3p ordinary

Sale

18,084

1.8811 GBP

3 1/3p ordinary

Sale

17,831

1.8800 GBP

3 1/3p ordinary

Sale

15,374

1.8836 GBP

3 1/3p ordinary

Sale

15,250

1.8816 GBP

3 1/3p ordinary

Sale

14,736

1.8825 GBP

3 1/3p ordinary

Sale

4,538

1.8820 GBP

3 1/3p ordinary

Sale

3,771

1.8828 GBP

3 1/3p ordinary

Sale

2,195

1.8829 GBP

3 1/3p ordinary

Sale

2,159

1.8840 GBP

3 1/3p ordinary

Sale

1,694

1.8817 GBP

3 1/3p ordinary

Sale

699

1.8860 GBP

3 1/3p ordinary

Sale

413

1.8819 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

465

1.8778 GBP

3 1/3p ordinary

SWAP

Decreasing Short

170,000

1.8790 GBP

3 1/3p ordinary

SWAP

Decreasing Short

42,146

1.8792 GBP

3 1/3p ordinary

SWAP

Decreasing Short

116,426

1.8799 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,624

1.8800 GBP

3 1/3p ordinary

SWAP

Decreasing Short

11,061

1.8801 GBP

3 1/3p ordinary

SWAP

Decreasing Short

23,790

1.8814 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13,687

1.8815 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,694

1.8817 GBP

3 1/3p ordinary

SWAP

Decreasing Short

7,165

1.8820 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,292

1.8823 GBP

3 1/3p ordinary

SWAP

Decreasing Short

15,374

1.8836 GBP

3 1/3p ordinary

SWAP

Decreasing Short

107,064

1.8838 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,979

1.8840 GBP

3 1/3p ordinary

SWAP

Increasing Short

14,269

1.8801 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,508

1.8807 GBP

3 1/3p ordinary

SWAP

Increasing Short

270,175

1.8814 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,099

1.8816 GBP

3 1/3p ordinary

SWAP

Increasing Short

19,734

1.8820 GBP

3 1/3p ordinary

SWAP

Increasing Short

53,309

1.8821 GBP

3 1/3p ordinary

SWAP

Increasing Short

19,723

1.8823 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,734

1.8824 GBP

3 1/3p ordinary

SWAP

Increasing Short

16,412

1.8826 GBP

3 1/3p ordinary

SWAP

Increasing Short

686

1.8827 GBP

3 1/3p ordinary

SWAP

Increasing Short

9,145

1.8834 GBP

3 1/3p ordinary

SWAP

Increasing Short

67,842

1.8836 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,997

1.8840 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:

02 Apr 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213