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:

30 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:

41,315,750

7.11%

2,400,099

0.41%

(2)

Cash-settled derivatives:

and/or controlled:

1,692,577

0.29%

40,957,537

7.05%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

43,008,327

7.40%

43,357,636

7.46%

(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

170,091

1.8442  GBP

3 1/3p ordinary

Purchase

97,907

1.8444  GBP

3 1/3p ordinary

Purchase

72,363

1.8452  GBP

3 1/3p ordinary

Purchase

32,053

1.8440  GBP

3 1/3p ordinary

Purchase

17,693

1.8432  GBP

3 1/3p ordinary

Purchase

13,893

1.8460  GBP

3 1/3p ordinary

Purchase

8,111

1.8425  GBP

3 1/3p ordinary

Purchase

8,058

1.8405  GBP

3 1/3p ordinary

Purchase

6,770

1.8325  GBP

3 1/3p ordinary

Purchase

5,443

1.8395  GBP

3 1/3p ordinary

Purchase

4,926

1.8386  GBP

3 1/3p ordinary

Purchase

4,800

1.8433  GBP

3 1/3p ordinary

Purchase

3,756

1.8383  GBP

3 1/3p ordinary

Purchase

3,511

1.8380  GBP

3 1/3p ordinary

Purchase

3,034

1.8393  GBP

3 1/3p ordinary

Purchase

3,002

1.8420  GBP

3 1/3p ordinary

Purchase

2,528

1.8397  GBP

3 1/3p ordinary

Purchase

2,499

1.8418  GBP

3 1/3p ordinary

Purchase

2,424

1.8400  GBP

3 1/3p ordinary

Purchase

2,200

1.8410  GBP

3 1/3p ordinary

Purchase

2,150

1.8471  GBP

3 1/3p ordinary

Purchase

1,729

1.8389  GBP

3 1/3p ordinary

Purchase

1,408

1.8376  GBP

3 1/3p ordinary

Purchase

974

1.8470  GBP

3 1/3p ordinary

Purchase

19

1.8334  GBP

3 1/3p ordinary

Sale

237,688

1.8460  GBP

3 1/3p ordinary

Sale

56,935

1.8454  GBP

3 1/3p ordinary

Sale

52,454

1.8437  GBP

3 1/3p ordinary

Sale

7,588

1.8360  GBP

3 1/3p ordinary

Sale

3,034

1.8370  GBP

3 1/3p ordinary

Sale

1,619

1.8525  GBP

3 1/3p ordinary

Sale

1,330

1.8397  GBP

3 1/3p ordinary

Sale

1,139

1.8441  GBP

3 1/3p ordinary

Sale

1,091

1.8368  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

7,588

1.8360  GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,199

1.8368  GBP

3 1/3p ordinary

SWAP

Decreasing Short

16,305

1.8393  GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,997

1.8398  GBP

3 1/3p ordinary

SWAP

Decreasing Short

359

1.8407  GBP

3 1/3p ordinary

SWAP

Decreasing Short

246,009

1.8460  GBP

3 1/3p ordinary

SWAP

Decreasing Short

856

1.8463  GBP

3 1/3p ordinary

SWAP

Increasing Short

6,770

1.8325  GBP

3 1/3p ordinary

SWAP

Increasing Short

4,051

1.8386  GBP

3 1/3p ordinary

SWAP

Increasing Short

30,056

1.8389  GBP

3 1/3p ordinary

SWAP

Increasing Short

8,058

1.8405  GBP

3 1/3p ordinary

SWAP

Increasing Short

1,223

1.8406  GBP

3 1/3p ordinary

SWAP

Increasing Short

8,111

1.8425  GBP

3 1/3p ordinary

SWAP

Increasing Short

17,693

1.8432  GBP

3 1/3p ordinary

SWAP

Increasing Short

4,800

1.8433  GBP

3 1/3p ordinary

SWAP

Increasing Short

10,493

1.8438  GBP

3 1/3p ordinary

SWAP

Increasing Short

24

1.8440  GBP

3 1/3p ordinary

SWAP

Increasing Short

52,373

1.8452  GBP

3 1/3p ordinary

SWAP

Increasing Short

119,812

1.8455  GBP

3 1/3p ordinary

SWAP

Increasing Short

8,507

1.8458  GBP

3 1/3p ordinary

SWAP

Increasing Short

29,734

1.8460  GBP

3 1/3p ordinary

SWAP

Increasing Short

584

1.8501  GBP

3 1/3p ordinary

CFD

Decreasing Short

17,186

1.8458  GBP

3 1/3p ordinary

CFD

Decreasing Short

1,672

1.8498  GBP

3 1/3p ordinary

CFD

Increasing Short

37,610

1.8389  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:

01 May 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213