Director/PDMR Shareholding

The Company announces that, on 11 June 2026 (the "Grant Date"), the following Directors were each granted awards under the DSBP over the number of ordinary shares of 15 5/19 pence in the Company set out against their names below, the number of shares being calculated using a market price of 306.64 pence per share:

The above awards were granted as nil cost options and were granted in respect of the deferred bonus for the 2025/26 financial year.

The Notification of Dealing Form for each Director can be found below. This announcement is made in accordance with the UK Market Abuse Regulation (Regulation (EU) 596/2014, as it forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018).

1. Details of PDMR/person closely associated with them ("PCA") a) Name Toby Courtauld 2. Reason for the notification a) Position/status Chief Executive b) Initial notification/amendment Initial notification 3. Details of the issuer, emission allowance market participant, action platform, auctioneer or auction monitor a) Name Great Portland Estates plc b) Legal Entity Identifier 213800JMEDD2Q4N1MC42 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 Ordinary shares of 15 5 / 19 p ISIN: GB00BF5H9P87 b) Nature of the transaction Grant of award over ordinary shares in the form of a nil cost option under the rules of the Great Portland Estates plc Deferred Share Bonus Plan c) Price(s) and volume(s) Price Volume(s) Ordinary shares Nil consideration 120,390 d) Aggregated information - Aggregated volume - Aggregated price - Aggregated total Aggregated volume: 120,390 Aggregated price: 0.0p Aggregated total: 120,390 o rdinary shares e) Date of transaction 11 June 2026 f) Place of the transaction Outside of trading venue 1. Details of PDMR/person closely associated with them ("PCA") a) Name Jayne Cottam 2. Reason for the notification a) Position/status Chief Financial Officer b) Initial notification/amendment Initial notification 3. Details of the issuer, emission allowance market participant, action platform, auctioneer or auction monitor a) Name Great Portland Estates plc b) Legal Entity Identifier 213800JMEDD2Q4N1MC42 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 Ordinary shares of 15 5 / 19 p ISIN: GB00BF5H9P87 b) Nature of the transaction Grant of award over ordinary shares in the form of a nil cost option under the rules of the Great Portland Estates plc Deferred Share Bonus Plan c) Price(s) and volume(s) Price Volume(s) Ordinary shares Nil consideration 3,331 d) Aggregated information - Aggregated volume - Aggregated price - Aggregated total Aggregated volume: 3,331 Aggregated price: 0.0p Aggregated total: 3,331 o rdinary shares e) Date of transaction 11 June 2026 f) Place of the transaction Outside of trading venue 1. Details of PDMR/person closely associated with them ("PCA") a) Name Dan Nicholson 2. Reason for the notification a) Position/status Executive Director b) Initial notification/amendment Initial notification 3. Details of the issuer, emission allowance market participant, action platform, auctioneer or auction monitor a) Name Great Portland Estates plc b) Legal Entity Identifier 213800JMEDD2Q4N1MC42 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 Ordinary shares of 15 5 / 19 p ISIN: GB00BF5H9P87 b) Nature of the transaction Grant of award over ordinary shares in the form of a nil cost option under the rules of the Great Portland Estates plc Deferred Share Bonus Plan c) Price(s) and volume(s) Price Volume(s) Ordinary shares Nil consideration 71,761 d) Aggregated information - Aggregated volume - Aggregated price - Aggregated total Aggregated volume: 71,761 Aggregated price: 0.0p Aggregated total: 71,761 o rdinary shares e) Date of transaction 11 June 2026 f) Place of the transaction Outside of trading venue