Director/PDMR Shareholding

1.

Details of PDMR / person closely associated

Name

Eric Hutchinson

2.

Reason for the notification

a)

Position / status

CEO

b)

Initial notification / amendment

Initial notification

3.

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Full name of the entity

Spirent Communications plc

b)

Legal Entity Identifier Code

213800HKCUNWP1916L38

4.

Details of the transaction(s)

a)

Description of the financial instrument

Identification code

Ordinary shares of 3 1/3 pence each

GB0004726096

b)

Nature of the transaction

Purchase of shares under the Spirent UK Employee Share Purchase Plan 2005

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- price

258

GBP0.967500

e)

Date of the transaction

24 August 2017

f)

Place of the transaction

London

1.

Details of PDMR / person closely associated

Name

Nigel Wright

2.

Reason for the notification

a)

Position / status

EVP Global Sales

b)

Initial notification / amendment

Initial notification

3.

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Full name of the entity

Spirent Communications plc

b)

Legal Entity Identifier Code

213800HKCUNWP1916L38

4.

Details of the transaction(s)

a)

Description of the financial instrument

Identification code

Ordinary shares of 3 1/3 pence each

GB0004726096

b)

Nature of the transaction

Purchase of shares under the Spirent US Employee Stock Purchase Plan

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- price

120

GBP0.967500

e)

Date of the transaction

24 August 2017

f)

Place of the transaction

London

PDMR

Total holding

Eric Hutchinson

2,005,929

Nigel Wright

11,736