1. Details of the person discharging managerial responsibilities / person closely associated

a) Names

Alex Smith

2. Reason for the notification

a) Position/status

CFO

b) Initial notification /Amendment

Initial notification

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

a) Name

SThree plc

b) LEI

2138003NEBX5VRP3EX50

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

Ordinary shares of 1p

GB00B0KM9T71

b) Nature of the transaction

Ongoing non-discretionary purchase of Partnership and Matching shares under the Share Incentive Plan ("SIP")

Purchase of shares under the Dividend Reinvestment Plan for the SIP

c) Price(s) and volume(s)

Purchase of Partnership and Matching shares under the Share Incentive Plan ("SIP")

Purchase of shares under the Dividend Reinvestment Plan for the SIP

Names

Alex Smith

Price(s)

342.50p

358p

Volume(s)

56

157

d) Aggregated information

- Aggregated volume

- Price

N/A

e) Date of the transaction

12/12/2019

f) Place of the transaction

London Stock Exchange