Director Declaration

19 June 2025

SThree plc

(the "Company")

Appointment of Senior Independent Director and changes in Directors' Responsibilities

As previously announced on 24 January 2025, having served as a non-executive director for nineyears, Denise Collis will be retiring from the Board on 30 June 2025.

In accordance with UKLR 6.4.6, SThree plc, the global STEM workforce consultancy, todayannounces that, with effect from 1 July 2025, Imogen Joss, who was appointed to the Board in December 2022, will become Senior Independent Director and Chair of the Remuneration Committee and Sanjeevan Bala, who was appointed to the Board in April 2024, will become Employee Engagement NED.

James Bilefield, Chair, said:

"I am immensely grateful to Denise for her significant contribution and dedication since her appointment. In addition to successfully discharging her responsibilities as our Senior Independent Director and Remuneration Committee Chair, Denise fully embraced the role of being our first Employee Engagement NED and has been a champion of and mentor to many of our colleagues in the business. I look forward to working with Imogen and Sanjeevan in their new roles."

Notes to editors

SThree plc brings skilled people together to build the future. We are the global STEM workforce consultancy, placing highly skilled, STEM specialist workers in the industries where they are needed most. We advise businesses, build expert teams, and deliver project solutions for our clients. With more than 38 years of experience in pure-play STEM and a global team with local expertise across 11 countries, we cover high-demand skills across Engineering, Life Sciences and Technology roles.

We provide permanent and flexible contract talent to a diverse base of around 6,000 clients. By combining advanced technology with expertise, we push beyond traditional boundaries to deliver tailored solutions, leveraging data and insight from our world-class operating platform.

Outpace tomorrow, together