NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF SUCH JURISDICTION

THIS IS AN ANNOUNCEMENT FALLING UNDER RULE 2.4 OF THE CITY CODE ON TAKEOVERS AND MERGERS (THE "CODE") AND DOES NOT CONSTITUTE AN ANNOUNCEMENT OF A FIRM INTENTION TO MAKE AN OFFER UNDER RULE 2.7 OF THE CODE. THERE CAN BE NO CERTAINTY THAT AN OFFER WILL BE MADE, NOR AS TO THE TERMS ON WHICH ANY OFFER WILL BE MADE

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION

FOR IMMEDIATE RELEASE

9 September 2026

SThree plc (“SThree” or the “Company”)

Response to media speculation

The Board of SThree notes the recent media speculation and confirms that it has received an unsolicited, preliminary and highly conditional approach from Circle8 Group Inc. (“Circle8”) regarding a possible offer for the entire issued and to be issued ordinary share capital of SThree.

In accordance with Rule 2.6(a) of the Code, Circle8 is required, by not later than 5.00 p.m. on 7 October 2026, to either announce a firm intention to make an offer for the Company in accordance with Rule 2.7 of the Code or announce that it does not intend to make an offer, in which case the announcement will be treated as a statement to which Rule 2.8 of the Code applies. This deadline can be extended with the consent of the Panel on Takeovers and Mergers (the “Panel”) in accordance with Rule 2.6(c) of the Code.

There can be no certainty that any offer will be made nor as to the terms on which any offer might be made. Accordingly, SThree shareholders are advised to take no action at this time. A further announcement will be made when appropriate.

Additional Information

This announcement is not intended to, and does not, constitute or form part of any offer, invitation or the solicitation of an offer to purchase, otherwise acquire, subscribe for, sell or otherwise dispose of, any securities, or the solicitation of any vote or approval in any jurisdiction, pursuant to this announcement or otherwise.

This announcement has been prepared in accordance with English law and information disclosed may not be the same as that which would have been disclosed in accordance with the laws of jurisdictions outside England. The release, publication or distribution of this announcement in whole or in part, directly or indirectly, in, into or from certain jurisdictions may be restricted by law. Therefore, any persons who are subject to the laws of any jurisdiction other than the United Kingdom or shareholders of SThree who are not resident in the United Kingdom will need to inform themselves about, and observe, any applicable requirements. Any failure to comply with the restrictions may constitute a violation of the securities law of any such jurisdiction.

Important Information

Goldman Sachs International, which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority in the United Kingdom, is acting exclusively for SThree and no one else in connection with the matters referred to in this announcement and will not be responsible to anyone other than SThree for providing the protections afforded to clients of Goldman Sachs International, or for providing advice in connection with the matters referred to in this announcement.

Rule 26.1 disclosure

In accordance with Rule 26.1 of the Code, a copy of this announcement will, subject to certain restrictions relating to persons resident in restricted jurisdictions, be available on SThree's website at www.sthree.com/investors, by no later than 12 noon (London time) on the business day following the date of this announcement. For the avoidance of doubt, the content of the website referred to in this announcement is not incorporated into and does not form part of this announcement.

Disclosure requirements of the Code

Following this announcement, SThree is now considered to be in an "offer period" as defined in the Code, and the dealing disclosure requirements as set out below will apply.

Under Rule 8.3(a) of the Code, any person who is interested in 1% or more of any class of relevant securities of an offeree company or of any securities exchange offeror (being any offeror other than an offeror in respect of which it has been announced that its offer is, or is likely to be, solely in cash) must make an Opening Position Disclosure following the commencement of the offer period and, if later, following the announcement in which any securities exchange offeror is first identified.

An Opening Position Disclosure must contain details of the person’s interests and short positions in, and rights to subscribe for, any relevant securities of each of (i) the offeree company and (ii) any securities exchange offeror(s). An Opening Position Disclosure by a person to whom Rule 8.3(a) of the Code applies must be made by no later than 3.30 pm (London time) on the 10th business day following the commencement of the offer period and, if appropriate, by no later than 3.30 pm (London time) on the 10th business day following the announcement in which any securities exchange offeror is first identified. Relevant persons who deal in the relevant securities of the offeree company or of a securities exchange offeror prior to the deadline for making an Opening Position Disclosure must instead make a Dealing Disclosure.

Under Rule 8.3(b) of the Code, any person who is, or becomes, interested in 1% or more of any class of relevant securities of the offeree company or of any securities exchange offeror must make a Dealing Disclosure if the person deals in any relevant securities of the offeree company or of any securities exchange offeror. A Dealing Disclosure must contain details of the dealing concerned and of the person’s interests and short positions in, and rights to subscribe for, any relevant securities of each of (i) the offeree company and (ii) any securities exchange offeror(s), save to the extent that these details have previously been disclosed under Rule 8 of the Code. A Dealing Disclosure by a person to whom Rule 8.3(b) of the Code applies must be made by no later than 3.30 pm (London time) on the business day following the date of the relevant dealing.

If two or more persons act together pursuant to an agreement or understanding, whether formal or informal, to acquire or control an interest in relevant securities of an offeree company or a securities exchange offeror, they will be deemed to be a single person for the purpose of Rule 8.3 of the Code.

Opening Position Disclosures must also be made by the offeree company and by any offeror and Dealing Disclosures must also be made by the offeree company, by any offeror and by any persons acting in concert with any of them (see Rules 8.1, 8.2 and 8.4 of the Code).

Details of the offeree and offeror companies in respect of whose relevant securities Opening Position Disclosures and Dealing Disclosures must be made can be found in the Disclosure Table on the Takeover Panel’s website at www.thetakeoverpanel.org.uk, including details of the number of relevant securities in issue, when the offer period commenced and when any offeror was first identified. You should contact the Panel’s Market Surveillance Unit on +44 (0) 20 7638 0129 if you are in any doubt as to whether you are required to make an Opening Position Disclosure or a Dealing Disclosure.