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:

28 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:

42,314,410

7.28%

993,091

0.17%

(2)

Cash-settled derivatives:

and/or controlled:

288,041

0.05%

42,050,918

7.24%

(3)

Stock-settled derivatives (including options)

and agreements to purchase/sell:

0

0.00%

0

0.00%

TOTAL:

42,602,451

7.33%

43,044,009

7.41%

(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

893,285

1.8923 GBP

3 1/3p ordinary

Purchase

76,674

1.8885 GBP

3 1/3p ordinary

Purchase

36,805

1.8910 GBP

3 1/3p ordinary

Purchase

23,097

1.8878 GBP

3 1/3p ordinary

Purchase

16,008

1.8866 GBP

3 1/3p ordinary

Purchase

12,365

1.8852 GBP

3 1/3p ordinary

Purchase

10,126

1.8834 GBP

3 1/3p ordinary

Purchase

7,423

1.8854 GBP

3 1/3p ordinary

Purchase

6,885

1.8880 GBP

3 1/3p ordinary

Purchase

5,207

1.8901 GBP

3 1/3p ordinary

Purchase

3,724

1.8860 GBP

3 1/3p ordinary

Purchase

3,518

1.8942 GBP

3 1/3p ordinary

Purchase

2,498

1.8886 GBP

3 1/3p ordinary

Purchase

1,870

1.8849 GBP

3 1/3p ordinary

Purchase

1,650

1.8812 GBP

3 1/3p ordinary

Purchase

1,504

1.8867 GBP

3 1/3p ordinary

Purchase

1,500

1.8900 GBP

3 1/3p ordinary

Purchase

1,287

1.8830 GBP

3 1/3p ordinary

Purchase

1,130

1.8836 GBP

3 1/3p ordinary

Purchase

900

1.8833 GBP

3 1/3p ordinary

Purchase

836

1.8950 GBP

3 1/3p ordinary

Purchase

790

1.8940 GBP

3 1/3p ordinary

Purchase

736

1.8945 GBP

3 1/3p ordinary

Purchase

660

1.8850 GBP

3 1/3p ordinary

Purchase

656

1.8840 GBP

3 1/3p ordinary

Purchase

620

1.8815 GBP

3 1/3p ordinary

Purchase

47

1.8870 GBP

3 1/3p ordinary

Sale

149,162

1.8904 GBP

3 1/3p ordinary

Sale

35,359

1.8832 GBP

3 1/3p ordinary

Sale

20,616

1.8910 GBP

3 1/3p ordinary

Sale

18,729

1.8819 GBP

3 1/3p ordinary

Sale

13,882

1.8847 GBP

3 1/3p ordinary

Sale

13,185

1.8881 GBP

3 1/3p ordinary

Sale

11,941

1.8828 GBP

3 1/3p ordinary

Sale

5,952

1.8868 GBP

3 1/3p ordinary

Sale

2,818

1.8857 GBP

3 1/3p ordinary

Sale

1,641

1.8842 GBP

3 1/3p ordinary

Sale

1,002

1.8860 GBP

3 1/3p ordinary

Sale

947

1.8869 GBP

3 1/3p ordinary

Sale

836

1.8950 GBP

3 1/3p ordinary

Sale

681

1.8837 GBP

3 1/3p ordinary

Sale

660

1.8850 GBP

3 1/3p ordinary

Sale

424

1.8899 GBP

3 1/3p ordinary

Sale

57

1.8949 GBP

3 1/3p ordinary

Sale

47

1.8980 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

13,935

1.8890 GBP

3 1/3p ordinary

SWAP

Decreasing Short

226,512

1.8790 GBP

3 1/3p ordinary

SWAP

Decreasing Short

14,236

1.8800 GBP

3 1/3p ordinary

SWAP

Decreasing Short

11,941

1.8828 GBP

3 1/3p ordinary

SWAP

Decreasing Short

35,359

1.8832 GBP

3 1/3p ordinary

SWAP

Decreasing Short

7,934

1.8851 GBP

3 1/3p ordinary

SWAP

Decreasing Short

10,021

1.8853 GBP

3 1/3p ordinary

SWAP

Decreasing Short

438

1.8860 GBP

3 1/3p ordinary

SWAP

Decreasing Short

286

1.8861 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,493

1.8877 GBP

3 1/3p ordinary

SWAP

Decreasing Short

13,185

1.8881 GBP

3 1/3p ordinary

SWAP

Decreasing Short

136,971

1.8908 GBP

3 1/3p ordinary

SWAP

Decreasing Short

4,645

1.8910 GBP

3 1/3p ordinary

SWAP

Decreasing Short

100

1.8938 GBP

3 1/3p ordinary

SWAP

Decreasing Short

57

1.8949 GBP

3 1/3p ordinary

SWAP

Increasing Short

719

1.8832 GBP

3 1/3p ordinary

SWAP

Increasing Short

181

1.8833 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,235

1.8837 GBP

3 1/3p ordinary

SWAP

Increasing Short

73

1.8840 GBP

3 1/3p ordinary

SWAP

Increasing Short

1,333

1.8860 GBP

3 1/3p ordinary

SWAP

Increasing Short

11,816

1.8864 GBP

3 1/3p ordinary

SWAP

Increasing Short

72,397

1.8869 GBP

3 1/3p ordinary

SWAP

Increasing Short

5,342

1.8880 GBP

3 1/3p ordinary

SWAP

Increasing Short

558

1.8883 GBP

3 1/3p ordinary

SWAP

Increasing Short

50,360

1.8888 GBP

3 1/3p ordinary

SWAP

Increasing Short

981

1.8890 GBP

3 1/3p ordinary

SWAP

Increasing Short

2,614

1.8910 GBP

3 1/3p ordinary

SWAP

Increasing Short

893,285

1.8923 GBP

3 1/3p ordinary

CFD

Increasing Short

2,650

1.8861 GBP

3 1/3p ordinary

CFD

Increasing Short

5,235

1.8911 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:

31 Mar 2025

Contact name:

Large Holdings Regulatory Operations

Telephone number:

020 3134 7213