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:

15 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:

39,241,869

6.75%

2,555,998

0.44%

(2)

Cash-settled derivatives:

and/or controlled:

1,645,265

0.28%

38,947,363

6.70%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

40,887,134

7.04%

41,503,361

7.14%

(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

41,579

1.7824 GBP

3 1/3p ordinary

Purchase

28,475

1.7788 GBP

3 1/3p ordinary

Purchase

16,391

1.7880 GBP

3 1/3p ordinary

Purchase

16,365

1.7810 GBP

3 1/3p ordinary

Purchase

12,254

1.7780 GBP

3 1/3p ordinary

Purchase

9,415

1.7931 GBP

3 1/3p ordinary

Purchase

3,309

1.7904 GBP

3 1/3p ordinary

Purchase

2,896

1.7870 GBP

3 1/3p ordinary

Purchase

2,858

1.7862 GBP

3 1/3p ordinary

Purchase

2,765

1.7852 GBP

3 1/3p ordinary

Purchase

1,772

1.7896 GBP

3 1/3p ordinary

Purchase

1,614

1.7922 GBP

3 1/3p ordinary

Purchase

1,533

1.7877 GBP

3 1/3p ordinary

Purchase

1,440

1.7890 GBP

3 1/3p ordinary

Purchase

1,267

1.7895 GBP

3 1/3p ordinary

Purchase

1,200

1.7960 GBP

3 1/3p ordinary

Purchase

631

1.7842 GBP

3 1/3p ordinary

Purchase

562

1.7860 GBP

3 1/3p ordinary

Purchase

345

1.7916 GBP

3 1/3p ordinary

Purchase

17

1.7820 GBP

3 1/3p ordinary

Purchase

9

1.7837 GBP

3 1/3p ordinary

Sale

9,688

1.7795 GBP

3 1/3p ordinary

Sale

7,519

1.7826 GBP

3 1/3p ordinary

Sale

2,488

1.7780 GBP

3 1/3p ordinary

Sale

1,236

1.7910 GBP

3 1/3p ordinary

Sale

341

1.7880 GBP

3 1/3p ordinary

Sale

18

1.7700 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

500,000

1.6668 GBP

3 1/3p ordinary

SWAP

Decreasing Short

18

1.7699 GBP

3 1/3p ordinary

SWAP

Decreasing Short

2,045

1.7780 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,236

1.7910 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,164

1.7779 GBP

3 1/3p ordinary

SWAP

Increasing Short

14,905

1.7780 GBP

3 1/3p ordinary

SWAP

Increasing Short

28,475

1.7788 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,150

1.7825 GBP

3 1/3p ordinary

SWAP

Increasing Short

10,270

1.7827 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,765

1.7852 GBP

3 1/3p ordinary

SWAP

Increasing Short

555

1.7860 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,896

1.7870 GBP

3 1/3p ordinary

SWAP

Increasing Short

16,391

1.7880 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,440

1.7890 GBP

3 1/3p ordinary

SWAP

Increasing Short

3,309

1.7904 GBP

3 1/3p ordinary

SWAP

Increasing Short

324

1.7920 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,670

1.7927 GBP

3 1/3p ordinary

SWAP

Increasing Short

9,415

1.7931 GBP

3 1/3p ordinary

SWAP

Increasing Short

100

1.7940 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,200

1.7960 GBP

3 1/3p ordinary

CFD

Increasing Short

17,677

1.7845 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:

16 Apr 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213