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

FOR IMMEDIATE RELEASE

17 October 2025

Big Yellow Group PLC (the "Company")

Rule 2.9 Announcement

In accordance with Rule 2.9 of the City Code on Takeovers and Mergers (the "Takeover Code"), the Company confirms that, as at the date and time of this announcement, it had in issue 196,767,698 ordinary shares of 10 pence each, each carrying one vote. The Company does not hold any shares in treasury. The total number of voting rights in the Company is therefore 196,767,698.

The International Securities Identification Number for the Company's ordinary shares is GB0002869419 and the Company's Legal Entity Identifier number is 213800W7Q4V2ZI8LIW31.

Enquiries:

About Big Yellow Group PLC

Big Yellow is the UK's brand leader in self storage and operates from a platform of 110 stores.  We have a pipeline comprising 14 proposed self storage facilities (including one replacement store).  The current maximum lettable area of the existing platform is 6.5 million sq ft.  When fully built out the portfolio will provide approximately 7.5 million sq ft of flexible storage space.  99% of our stores and sites by value are held freehold and long leasehold, with the remaining 1% short leasehold.  Currently by revenue 75% of our stores are in London and its commuter towns, with the balance in larger regional conurbations.

Our stores utilise state of the art technology for our digital and operating platforms including security, and we focus on locating our stores in high profile, accessible, main road locations.  We also focus on providing excellent customer service, a highly engaged employee culture, and with significant and increasing investment in sustainability.

Disclosure requirements of the Code

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) 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. A Dealing Disclosure by a person to whom Rule 8.3(b) 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 purposes of Rule 8.3.

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).

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 Takeover 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.