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:

24 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:

42,807,796

7.37%

954,746

0.16%

(2)

Cash-settled derivatives:

and/or controlled:

260,282

0.04%

42,544,169

7.32%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

43,068,078

7.41%

43,498,915

7.48%

(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

55,612

1.8927 GBP

3 1/3p ordinary

Purchase

29,122

1.8940 GBP

3 1/3p ordinary

Purchase

17,446

1.8925 GBP

3 1/3p ordinary

Purchase

9,046

1.8904 GBP

3 1/3p ordinary

Purchase

8,412

1.8922 GBP

3 1/3p ordinary

Purchase

8,385

1.8910 GBP

3 1/3p ordinary

Purchase

7,143

1.8870 GBP

3 1/3p ordinary

Purchase

4,969

1.8892 GBP

3 1/3p ordinary

Purchase

4,867

1.8879 GBP

3 1/3p ordinary

Purchase

2,224

1.8936 GBP

3 1/3p ordinary

Purchase

1,776

1.8890 GBP

3 1/3p ordinary

Purchase

1,517

1.8815 GBP

3 1/3p ordinary

Purchase

1,486

1.8835 GBP

3 1/3p ordinary

Purchase

1,468

1.8938 GBP

3 1/3p ordinary

Purchase

1,444

1.8970 GBP

3 1/3p ordinary

Purchase

1,444

1.8969 GBP

3 1/3p ordinary

Purchase

975

1.8920 GBP

3 1/3p ordinary

Purchase

886

1.8917 GBP

3 1/3p ordinary

Purchase

676

1.8945 GBP

3 1/3p ordinary

Purchase

609

1.8840 GBP

3 1/3p ordinary

Purchase

271

1.8960 GBP

3 1/3p ordinary

Purchase

96

1.8900 GBP

3 1/3p ordinary

Sale

169,268

1.8940 GBP

3 1/3p ordinary

Sale

115,314

1.8937 GBP

3 1/3p ordinary

Sale

59,964

1.8804 GBP

3 1/3p ordinary

Sale

8,309

1.8891 GBP

3 1/3p ordinary

Sale

8,239

1.8856 GBP

3 1/3p ordinary

Sale

7,381

1.8933 GBP

3 1/3p ordinary

Sale

6,144

1.8874 GBP

3 1/3p ordinary

Sale

5,887

1.8800 GBP

3 1/3p ordinary

Sale

2,435

1.8880 GBP

3 1/3p ordinary

Sale

1,765

1.8876 GBP

3 1/3p ordinary

Sale

1,444

1.8970 GBP

3 1/3p ordinary

Sale

1,316

1.8885 GBP

3 1/3p ordinary

Sale

1,260

1.8873 GBP

3 1/3p ordinary

Sale

1,182

1.8810 GBP

3 1/3p ordinary

Sale

952

1.8840 GBP

3 1/3p ordinary

Sale

703

1.8805 GBP

3 1/3p ordinary

Sale

663

1.8950 GBP

3 1/3p ordinary

Sale

592

1.8947 GBP

3 1/3p ordinary

Sale

459

1.8820 GBP

3 1/3p ordinary

Sale

452

1.8850 GBP

3 1/3p ordinary

Sale

405

1.8870 GBP

3 1/3p ordinary

Sale

330

1.8889 GBP

3 1/3p ordinary

Sale

271

1.8960 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

12,181

1.8917 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,887

1.8799 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,623

1.8847 GBP

3 1/3p ordinary

SWAP

Decreasing Short

452

1.8850 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,412

1.8864 GBP

3 1/3p ordinary

SWAP

Decreasing Short

6,144

1.8875 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,870

1.8876 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,435

1.8880 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,316

1.8885 GBP

3 1/3p ordinary

SWAP

Decreasing Short

330

1.8889 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,616

1.8890 GBP

3 1/3p ordinary

SWAP

Decreasing Short

8,309

1.8891 GBP

3 1/3p ordinary

SWAP

Decreasing Short

353

1.8924 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,446

1.8933 GBP

3 1/3p ordinary

SWAP

Decreasing Short

108,961

1.8938 GBP

3 1/3p ordinary

SWAP

Decreasing Short

19,066

1.8939 GBP

3 1/3p ordinary

SWAP

Decreasing Short

146,970

1.8940 GBP

3 1/3p ordinary

SWAP

Decreasing Short

15

1.9010 GBP

3 1/3p ordinary

SWAP

Increasing Short

13,219

1.8795 GBP

3 1/3p ordinary

SWAP

Increasing Short

56

1.8801 GBP

3 1/3p ordinary

SWAP

Increasing Short

482

1.8810 GBP

3 1/3p ordinary

SWAP

Increasing Short

967

1.8863 GBP

3 1/3p ordinary

SWAP

Increasing Short

83

1.8875 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,817

1.8877 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,867

1.8879 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,205

1.8890 GBP

3 1/3p ordinary

SWAP

Increasing Short

9,046

1.8904 GBP

3 1/3p ordinary

SWAP

Increasing Short

30,377

1.8915 GBP

3 1/3p ordinary

SWAP

Increasing Short

25,991

1.8918 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,044

1.8919 GBP

3 1/3p ordinary

SWAP

Increasing Short

31,992

1.8940 GBP

3 1/3p ordinary

CFD

Increasing Short

18,125

1.8915 GBP

3 1/3p ordinary

CFD

Increasing Short

7,222

1.8931 GBP

3 1/3p ordinary

SWAP

Closing Short

59,964

1.8804 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:

25 Mar 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213