Rule 2.9 Announcement

Big Yellow Group PLC, on October 17, 2025, announced that, in accordance with Rule 2.9 of the City Code on Takeovers and Mergers, the company has 196,767,698 ordinary shares in issue, each with one vote. Each share has a value of 10 pence. The company holds no shares in treasury, therefore the total number of voting rights is 196,767,698. The International Securities Identification Number for the company's ordinary shares is GB0002869419 and the Legal Entity Identifier number is 213800W7Q4V2ZI8LIW31.