Tristel Regulatory News (TSTL)

1.

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Astrid Haeber

2.

Reason for the Notification

a)

Position/status

Subsidiary Director / PDMR

b)

Initial notification/Amendment

3.

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

a)

Name

Tristel plc

b)

LEI

n/a

4.

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the Financial instrument, type of instrument

Identification code

GB00B07RVT99

b)

Nature of the transaction

c)

Price(s) and volume(s)

d)

Aggregated information:

· Aggregated volume

· Price

Sale of 97,500 ordinary shares of 1p pence at 128.2437 pence per ordinary share

e)

Date of the transaction

19 August 2016

f)

Place of the transaction

London Stock Exchange, AIM Market (XLON)