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:

07 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:

47,043,552

8.13%

1,402,355

0.24%

(2)

Cash-settled derivatives:

and/or controlled:

227,454

0.04%

46,835,065

8.09%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

47,271,006

8.17%

48,237,420

8.34%

(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

84,494

1.8930 GBP

3 1/3p ordinary

Purchase

20,817

1.8888 GBP

3 1/3p ordinary

Purchase

5,950

1.8860 GBP

3 1/3p ordinary

Purchase

5,541

1.8865 GBP

3 1/3p ordinary

Purchase

5,372

1.8923 GBP

3 1/3p ordinary

Purchase

4,845

1.8903 GBP

3 1/3p ordinary

Purchase

3,869

1.8883 GBP

3 1/3p ordinary

Purchase

3,795

1.8873 GBP

3 1/3p ordinary

Purchase

3,099

1.8919 GBP

3 1/3p ordinary

Purchase

1,336

1.8910 GBP

3 1/3p ordinary

Purchase

1,174

1.8869 GBP

3 1/3p ordinary

Purchase

1,134

1.8925 GBP

3 1/3p ordinary

Purchase

970

1.8907 GBP

3 1/3p ordinary

Purchase

950

1.8926 GBP

3 1/3p ordinary

Purchase

652

1.8840 GBP

3 1/3p ordinary

Purchase

621

1.8904 GBP

3 1/3p ordinary

Purchase

524

1.8920 GBP

3 1/3p ordinary

Purchase

473

1.8900 GBP

3 1/3p ordinary

Purchase

473

1.8880 GBP

3 1/3p ordinary

Purchase

334

1.8870 GBP

3 1/3p ordinary

Sale

117,843

1.8930 GBP

3 1/3p ordinary

Sale

26,729

1.8862 GBP

3 1/3p ordinary

Sale

26,140

1.8898 GBP

3 1/3p ordinary

Sale

22,014

1.8911 GBP

3 1/3p ordinary

Sale

19,284

1.8897 GBP

3 1/3p ordinary

Sale

6,554

1.8883 GBP

3 1/3p ordinary

Sale

5,541

1.8809 GBP

3 1/3p ordinary

Sale

4,412

1.8888 GBP

3 1/3p ordinary

Sale

2,959

1.8896 GBP

3 1/3p ordinary

Sale

1,503

1.8894 GBP

3 1/3p ordinary

Sale

1,451

1.8856 GBP

3 1/3p ordinary

Sale

1,387

1.8923 GBP

3 1/3p ordinary

Sale

707

1.8910 GBP

3 1/3p ordinary

Sale

702

1.8901 GBP

3 1/3p ordinary

Sale

501

1.8915 GBP

3 1/3p ordinary

Sale

473

1.8880 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

5,541

1.8809 GBP

3 1/3p ordinary

SWAP

Decreasing Short

21,327

1.8855 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,525

1.8888 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,402

1.8889 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,503

1.8894 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,244

1.8895 GBP

3 1/3p ordinary

SWAP

Decreasing Short

11,088

1.8897 GBP

3 1/3p ordinary

SWAP

Decreasing Short

26,140

1.8898 GBP

3 1/3p ordinary

SWAP

Decreasing Short

20,740

1.8900 GBP

3 1/3p ordinary

SWAP

Decreasing Short

15,437

1.8902 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,373

1.8906 GBP

3 1/3p ordinary

SWAP

Decreasing Short

17,931

1.8930 GBP

3 1/3p ordinary

SWAP

Increasing Short

554

1.8830 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,837

1.8860 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,541

1.8865 GBP

3 1/3p ordinary

SWAP

Increasing Short

334

1.8870 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,117

1.8880 GBP

3 1/3p ordinary

SWAP

Increasing Short

1

1.8900 GBP

3 1/3p ordinary

SWAP

Increasing Short

27,575

1.8907 GBP

3 1/3p ordinary

SWAP

Increasing Short

147

1.8920 GBP

3 1/3p ordinary

SWAP

Increasing Short

950

1.8926 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,662

1.8930 GBP

3 1/3p ordinary

CFD

Increasing Short

4,585

1.8866 GBP

3 1/3p ordinary

CFD

Increasing Short

5,654

1.8914 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:

10 Mar 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213