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 Mar 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:

42,789,828

7.36%

989,434

0.17%

(2)

Cash-settled derivatives:

and/or controlled:

282,208

0.05%

42,533,974

7.32%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

43,072,036

7.41%

43,523,408

7.49%

(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

126,903

1.8840 GBP

3 1/3p ordinary

Purchase

73,999

1.8800 GBP

3 1/3p ordinary

Purchase

45,566

1.8827 GBP

3 1/3p ordinary

Purchase

32,746

1.8780 GBP

3 1/3p ordinary

Purchase

27,709

1.8754 GBP

3 1/3p ordinary

Purchase

25,146

1.8784 GBP

3 1/3p ordinary

Purchase

18,312

1.8763 GBP

3 1/3p ordinary

Purchase

14,443

1.8790 GBP

3 1/3p ordinary

Purchase

12,020

1.8794 GBP

3 1/3p ordinary

Purchase

9,536

1.8829 GBP

3 1/3p ordinary

Purchase

8,348

1.8773 GBP

3 1/3p ordinary

Purchase

6,895

1.8832 GBP

3 1/3p ordinary

Purchase

5,529

1.8806 GBP

3 1/3p ordinary

Purchase

5,029

1.8820 GBP

3 1/3p ordinary

Purchase

4,864

1.8825 GBP

3 1/3p ordinary

Purchase

4,626

1.8803 GBP

3 1/3p ordinary

Purchase

4,505

1.8775 GBP

3 1/3p ordinary

Purchase

3,974

1.8797 GBP

3 1/3p ordinary

Purchase

2,446

1.8810 GBP

3 1/3p ordinary

Purchase

2,244

1.8814 GBP

3 1/3p ordinary

Purchase

1,864

1.8835 GBP

3 1/3p ordinary

Purchase

1,613

1.8789 GBP

3 1/3p ordinary

Purchase

1,216

1.8750 GBP

3 1/3p ordinary

Purchase

1,035

1.8745 GBP

3 1/3p ordinary

Purchase

826

1.8755 GBP

3 1/3p ordinary

Purchase

773

1.8830 GBP

3 1/3p ordinary

Purchase

424

1.8823 GBP

3 1/3p ordinary

Sale

214,906

1.8785 GBP

3 1/3p ordinary

Sale

54,920

1.8824 GBP

3 1/3p ordinary

Sale

54,300

1.8809 GBP

3 1/3p ordinary

Sale

34,259

1.8811 GBP

3 1/3p ordinary

Sale

28,921

1.8797 GBP

3 1/3p ordinary

Sale

18,767

1.8788 GBP

3 1/3p ordinary

Sale

10,485

1.8807 GBP

3 1/3p ordinary

Sale

8,021

1.8758 GBP

3 1/3p ordinary

Sale

7,337

1.8835 GBP

3 1/3p ordinary

Sale

6,801

1.8825 GBP

3 1/3p ordinary

Sale

6,473

1.8794 GBP

3 1/3p ordinary

Sale

4,367

1.8741 GBP

3 1/3p ordinary

Sale

4,036

1.8804 GBP

3 1/3p ordinary

Sale

3,168

1.8800 GBP

3 1/3p ordinary

Sale

3,122

1.8803 GBP

3 1/3p ordinary

Sale

3,059

1.8818 GBP

3 1/3p ordinary

Sale

2,923

1.8777 GBP

3 1/3p ordinary

Sale

2,832

1.8799 GBP

3 1/3p ordinary

Sale

2,682

1.8819 GBP

3 1/3p ordinary

Sale

2,251

1.8750 GBP

3 1/3p ordinary

Sale

2,141

1.8810 GBP

3 1/3p ordinary

Sale

1,613

1.8790 GBP

3 1/3p ordinary

Sale

1,353

1.8838 GBP

3 1/3p ordinary

Sale

773

1.8830 GBP

3 1/3p ordinary

Sale

610

1.8844 GBP

3 1/3p ordinary

Sale

361

1.8880 GBP

3 1/3p ordinary

Sale

103

1.8820 GBP

3 1/3p ordinary

Sale

4

1.8840 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

Increasing Short

16,273

1.8820 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,216

1.8750 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13,263

1.8760 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,633

1.8776 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,923

1.8777 GBP

3 1/3p ordinary

SWAP

Decreasing Short

18,767

1.8788 GBP

3 1/3p ordinary

SWAP

Decreasing Short

28,921

1.8797 GBP

3 1/3p ordinary

SWAP

Decreasing Short

48,700

1.8808 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,679

1.8809 GBP

3 1/3p ordinary

SWAP

Decreasing Short

121

1.8810 GBP

3 1/3p ordinary

SWAP

Decreasing Short

54,373

1.8816 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,038

1.8819 GBP

3 1/3p ordinary

SWAP

Decreasing Short

18,800

1.8822 GBP

3 1/3p ordinary

SWAP

Decreasing Short

300

1.8829 GBP

3 1/3p ordinary

SWAP

Decreasing Short

7,337

1.8835 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,353

1.8838 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,415

1.8840 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,505

1.8775 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,974

1.8797 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,441

1.8819 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,112

1.8820 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,286

1.8821 GBP

3 1/3p ordinary

SWAP

Increasing Short

34,627

1.8822 GBP

3 1/3p ordinary

SWAP

Increasing Short

424

1.8823 GBP

3 1/3p ordinary

SWAP

Increasing Short

24,567

1.8830 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,864

1.8835 GBP

3 1/3p ordinary

SWAP

Increasing Short

88,420

1.8840 GBP

3 1/3p ordinary

CFD

Decreasing Short

9,310

1.8838 GBP

3 1/3p ordinary

CFD

Increasing Short

478

1.8854 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:

28 Mar 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213