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:

08 May 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:

42,430,272

7.30%

2,299,579

0.40%

(2)

Cash-settled derivatives:

and/or controlled:

1,612,107

0.28%

42,114,051

7.25%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

44,042,379

7.58%

44,413,630

7.64%

(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

73,635

1.8860 GBP

3 1/3p ordinary

Purchase

63,351

1.8911 GBP

3 1/3p ordinary

Purchase

37,004

1.8869 GBP

3 1/3p ordinary

Purchase

23,744

1.8859 GBP

3 1/3p ordinary

Purchase

18,762

1.8908 GBP

3 1/3p ordinary

Purchase

14,845

1.8913 GBP

3 1/3p ordinary

Purchase

12,651

1.8853 GBP

3 1/3p ordinary

Purchase

12,452

1.8882 GBP

3 1/3p ordinary

Purchase

12,093

1.8919 GBP

3 1/3p ordinary

Purchase

11,226

1.8884 GBP

3 1/3p ordinary

Purchase

10,605

1.8805 GBP

3 1/3p ordinary

Purchase

8,242

1.8951 GBP

3 1/3p ordinary

Purchase

7,530

1.8901 GBP

3 1/3p ordinary

Purchase

7,052

1.8878 GBP

3 1/3p ordinary

Purchase

5,953

1.8895 GBP

3 1/3p ordinary

Purchase

3,689

1.8938 GBP

3 1/3p ordinary

Purchase

2,546

1.8920 GBP

3 1/3p ordinary

Purchase

2,290

1.8880 GBP

3 1/3p ordinary

Purchase

2,107

1.9000 GBP

3 1/3p ordinary

Purchase

1,944

1.8898 GBP

3 1/3p ordinary

Purchase

1,867

1.8840 GBP

3 1/3p ordinary

Purchase

1,723

1.8946 GBP

3 1/3p ordinary

Purchase

1,654

1.8903 GBP

3 1/3p ordinary

Purchase

1,532

1.8870 GBP

3 1/3p ordinary

Purchase

1,490

1.8977 GBP

3 1/3p ordinary

Purchase

1,247

1.8900 GBP

3 1/3p ordinary

Purchase

805

1.9020 GBP

3 1/3p ordinary

Purchase

797

1.8800 GBP

3 1/3p ordinary

Purchase

755

1.8834 GBP

3 1/3p ordinary

Purchase

614

1.8879 GBP

3 1/3p ordinary

Sale

37,040

1.8880 GBP

3 1/3p ordinary

Sale

31,240

1.8860 GBP

3 1/3p ordinary

Sale

13,387

1.8895 GBP

3 1/3p ordinary

Sale

3,910

1.8876 GBP

3 1/3p ordinary

Sale

3,689

1.8940 GBP

3 1/3p ordinary

Sale

3,223

1.8859 GBP

3 1/3p ordinary

Sale

2,826

1.8907 GBP

3 1/3p ordinary

Sale

2,522

1.8820 GBP

3 1/3p ordinary

Sale

907

1.8919 GBP

3 1/3p ordinary

Sale

718

1.8879 GBP

3 1/3p ordinary

Sale

579

1.8914 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

2,879

1.8827 GBP

3 1/3p ordinary

SWAP

Decreasing Short

3,223

1.8859 GBP

3 1/3p ordinary

SWAP

Decreasing Short

16,689

1.8860 GBP

3 1/3p ordinary

SWAP

Decreasing Short

1,195

1.8878 GBP

3 1/3p ordinary

SWAP

Decreasing Short

718

1.8880 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13,387

1.8895 GBP

3 1/3p ordinary

SWAP

Decreasing Short

5,599

1.8902 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13

1.8980 GBP

3 1/3p ordinary

SWAP

Increasing Short

10,605

1.8805 GBP

3 1/3p ordinary

SWAP

Increasing Short

23,744

1.8859 GBP

3 1/3p ordinary

SWAP

Increasing Short

54,631

1.8860 GBP

3 1/3p ordinary

SWAP

Increasing Short

199

1.8861 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,917

1.8897 GBP

3 1/3p ordinary

SWAP

Increasing Short

7,327

1.8898 GBP

3 1/3p ordinary

SWAP

Increasing Short

4,000

1.8902 GBP

3 1/3p ordinary

SWAP

Increasing Short

14,845

1.8913 GBP

3 1/3p ordinary

SWAP

Increasing Short

12,093

1.8919 GBP

3 1/3p ordinary

SWAP

Increasing Short

7,237

1.8945 GBP

3 1/3p ordinary

SWAP

Increasing Short

8,242

1.8951 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,107

1.9000 GBP

3 1/3p ordinary

CFD

Decreasing Short

13,208

1.8860 GBP

3 1/3p ordinary

CFD

Decreasing Short

32,100

1.8920 GBP

3 1/3p ordinary

CFD

Increasing Short

31,400

1.8869 GBP

3 1/3p ordinary

CFD

Increasing Short

32,100

1.8920 GBP

3 1/3p ordinary

CFD

Increasing Short

27,849

1.8923 GBP

3 1/3p ordinary

CFD

Increasing Short

15,360

1.8924 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:

09 May 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213