LAUNCH PRESS RELEASE

THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN ARE RESTRICTED AND NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART, INTO OR IN THE UNITED STATES, CANADA, AUSTRALIA, SOUTH AFRICA, JAPAN OR ANY OTHER JURISDICTION IN WHICH OFFERS OR SALES WOULD BE PROHIBITED BY APPLICABLE LAW. THIS ANNOUNCEMENT IS FOR INFORMATION PURPOSES ONLY AND DOES NOT CONSTITUTE OR FORM AN OFFER FOR SALE OF, OR THE SOLICITATION OF AN OFFER TO BUY, THE SECURITIES REFERRED TO HEREIN IN ANY JURISDICTION, INCLUDING THE UNITED STATES, CANADA, AUSTRALIA, SOUTH AFRICA, JAPAN OR ANY OTHER JURISDICTION IN WHICH OFFERS OR SALES WOULD BE PROHIBITED BY APPLICABLE LAW.

PLEASE SEE THE IMPORTANT NOTICE AT THE END OF THIS ANNOUNCEMENT.

PROPOSED PLACING AND DIRECTED BUYBACK IN RESPECT OF, IN AGGREGATE, APPROXIMATELY 21.5 MILLION SHARES IN LONDON STOCK EXCHANGE GROUP PLC ("LSEG" OR THE "COMPANY").

5 March 2024

York Holdings II Limited ("York Holdings II") and York Holdings III Limited ("York Holdings III" and together with York Holdings II, the "York Entities") (being entities owned by BCP York Holdings (Delaware) L.P. ("BCP York") (an entity owned by a consortium of certain investment funds affiliated with Blackstone Inc. ("Blackstone") and including an affiliate of Canada Pension Plan Investment Board, an affiliate of GIC Special Investments Pte. Ltd. and certain other co-investors), Thomson Reuters and certain other minority holders) (BCP York and the York Entities together, the "Consortium") announce their intention to execute a monetisation in respect of approximately 21.5 million shares in LSEG, to be effected by way of a placing and directed buyback, as set out in further detail below.

The York Entities intend to sell, in aggregate, approximately 15.9 million voting ordinary shares of 679/86 pence each ("Voting Shares") in the capital of the Company (the "Sale Shares") through a placing to institutional investors (the "Placing"). The Sale Shares represent approximately a 2.9% economic interest and a 3.0% voting interest in the Company.

Further to the announcement of its preliminary results for the year ended 31 December 2023, including its plan to execute up to £1 billion of share buybacks during 2024, LSEG has separately notified the York Entities of its intention to make an off-market purchase of, in aggregate, approximately £500 million worth of Voting Shares and limited-voting ordinary shares ("Limited-voting Ordinary Shares") in the capital of LSEG (the "Off-market Purchase"). This will be executed concurrently with the Placing, in accordance with the terms of the directed buyback contract entered into by LSEG and the Consortium in May 2023, and as approved by the shareholders of LSEG at the annual general meeting held on 27 April 2023, subject to the completion of the Placing.

LSEG is not party to the Placing and will not receive any proceeds from the Placing.

The York Entities currently hold, in aggregate, 33.3 million Voting Shares and 20.6 million Limited-voting Ordinary Shares representing, in aggregate, approximately a 9.9% economic interest and a 6.8% voting interest in the Company.

The Placing and the Off-market Purchase are being undertaken in compliance with the Relationship Agreement (as amended and including a limited variation of the lock-up arrangements contained in the Relationship Agreement) (as defined in the Prospectus (see below)), a summary of the terms of which is set out in the prospectus published by LSEG on 9 December 2020 (the "Prospectus"). The amendments to the Relationship Agreement also permit the York Entities to sell call options over, in aggregate, up to 10 million additional Voting Shares (the "Call Option Shares") (the "Call Option Transaction") provided that such Call Option Transaction is entered into no later than 4 April 2024.

Following successful completion of the Placing and the Off-market Purchase the remaining Voting Shares and Limited-voting Ordinary Shares owned by the York Entities will, in addition to the outstanding lock-up arrangements with the Company contained in the amended Relationship Agreement, be subject to a lock-up until after the Company publishes its trading statement for the first quarter of 2024 on a Regulatory Information Service, subject to customary exceptions and waiver by the Joint Global Coordinators (as defined below). The lock-up also contains exceptions for disposals of shares pursuant to share repurchases by the Company and pursuant to the terms of the Call Option Transaction.

The price per Placing Share and the final number of Placing Shares to be placed will be determined by way of an accelerated bookbuilding process to institutional investors. The bookbuilding period will commence immediately following this announcement, and may close at any time on short notice. The results of the Placing will be announced as soon as practicable thereafter.

Barclays Bank PLC ("Barclays"), Merrill Lynch International ("BofA Securities"), Citigroup Global Markets Limited ("Citigroup"), Goldman Sachs International ("Goldman Sachs"), J.P. Morgan Securities plc (which conducts its UK investment banking business as J.P. Morgan Cazenove) ("J.P. Morgan Cazenove") and Morgan Stanley & Co. International plc ("Morgan Stanley") (together, in such capacities, the "Joint Global Coordinators"), are acting as Joint Global Coordinators and Joint Bookrunners in connection with the Placing and Blackstone Capital Markets (together with the Joint Global Coordinators, the "Managers") is acting as a Co-Lead Manager in connection with the Placing.

The Placing Shares rank pari passu in all respects with the Company's Voting Shares.

For further information, please contact:

THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS FOR INFORMATION PURPOSES ONLY AND DOES NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY OF THESE SECURITIES IN THE UNITED STATES, CANADA, AUSTRALIA, SOUTH AFRICA, JAPAN OR ANY OTHER JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH JURISDICTION. THE SECURITIES MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES ABSENT REGISTRATION OR AN APPLICABLE EXEMPTION FROM UNITED STATES REGISTRATION REQUIREMENTS. NO PUBLIC OFFER OF SECURITIES IS TO BE MADE IN THE UNITED STATES AND NEITHER THIS ANNOUNCEMENT NOR ANY COPY OF IT MAY BE TAKEN, TRANSMITTED OR DISTRIBUTED, DIRECTLY OR INDIRECTLY, IN OR INTO OR FROM THE UNITED STATES (INCLUDING ITS TERRITORIES AND POSSESSIONS, ANY STATE OF THE UNITED STATES AND THE DISTRICT OF COLUMBIA), CANADA, AUSTRALIA, SOUTH AFRICA, JAPAN OR ANY OTHER JURISDICTION WHERE SUCH TAKING, TRANSMISSION OR DISTRIBUTION WOULD BE UNLAWFUL. ANY FAILURE TO COMPLY WITH THIS RESTRICTION MAY CONSTITUTE A VIOLATION OF UNITED STATES, CANADIAN, AUSTRALIAN, SOUTH AFRICAN OR JAPANESE SECURITIES LAWS.

THIS ANNOUNCEMENT AND ANY OFFER OF SHARES IF MADE SUBSEQUENTLY ARE ONLY ADDRESSED TO AND DIRECTED AT PERSONS (1) IN THE EEA WHO ARE QUALIFIED INVESTORS WITHIN THE MEANING OF ARTICLE 2(E) OF REGULATION (EU) 2017/1129 (THE "PROSPECTUS REGULATION") AND (2) IN THE UNITED KINGDOM WHO ARE QUALIFIED INVESTORS WITHIN THE MEANING OF ARTICLE 2(E) OF THE PROSPECTUS REGULATION AS IT FORMS PART OF UK LAW BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018, AS AMENDED WHO (A) HAVE PROFESSIONAL EXPERIENCE IN MATTERS RELATING TO INVESTMENTS WHO FALL WITHIN ARTICLE 19(5) OF THE FINANCIAL SERVICES AND MARKETS ACT 2000 (FINANCIAL PROMOTION) ORDER 2005, AS AMENDED (THE "ORDER") OR (B) ARE HIGH NET WORTH ENTITIES FALLING WITHIN ARTICLE 49(2)(A) TO (D) OF THE ORDER OR (3) ARE PERSONS TO WHOM AN OFFER OF THE PLACING SHARES MAY OTHERWISE BE LAWFULLY COMMUNICATED (ALL SUCH PERSONS BEING REFERRED TO AS "RELEVANT PERSONS"). PERSONS WHO ARE NOT RELEVANT PERSONS SHOULD NOT TAKE ANY ACTION ON THE BASIS OF THIS ANNOUNCEMENT AND SHOULD NOT ACT OR RELY ON IT.

THE SECURITIES REFERRED TO HEREIN WILL BE OFFERED WITHIN THE UNITED STATES ONLY TO QUALIFIED INSTITUTIONAL BUYERS IN RELIANCE ON RULE 144A UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND OUTSIDE THE UNITED STATES IN RELIANCE ON REGULATION S UNDER THE SECURITIES ACT, SUBJECT TO PREVAILING MARKET AND OTHER CONDITIONS. THERE IS NO ASSURANCE THAT THE PLACING WILL BE COMPLETED, OR IF COMPLETED, AS TO THE TERMS ON WHICH IT IS COMPLETED. THE SECURITIES REFERRED TO HEREIN HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE SECURITIES ACT AND MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES WITHOUT REGISTRATION THEREUNDER OR UNLESS PURSUANT TO AN AVAILABLE EXEMPTION THEREFROM. NEITHER THIS DOCUMENT NOR THE INFORMATION CONTAINED HEREIN CONSTITUTES OR FORMS PART OF AN OFFER TO SELL, OR THE SOLICITATION OF AN OFFER TO BUY, SECURITIES IN THE UNITED STATES. THERE WILL BE NO PUBLIC OFFER OF ANY SECURITIES IN THE UNITED STATES OR ANY OTHER JURISDICTION. THIS PRESS RELEASE DOES NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES, NOR SHALL IT CONSTITUTE AN OFFER, SOLICITATION OR SALE IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL.

THIS ANNOUNCEMENT DOES NOT, AND SHALL NOT, IN ANY CIRCUMSTANCES CONSTITUTE A PUBLIC OFFERING, NOR AN OFFER TO SELL OR TO SUBSCRIBE, NOR A SOLICITATION TO OFFER TO PURCHASE OR TO SUBSCRIBE SECURITIES IN ANY JURISDICTION. THE DISTRIBUTION OF THIS ANNOUNCEMENT AND THE OFFERING OR SALE OF THE SECURITIES IN CERTAIN JURISDICTIONS MAY BE RESTRICTED BY LAW. NO ACTION HAS BEEN TAKEN BY YORK HOLDINGS II, YORK HOLDINGS III, THE MANAGERS, OR ANY OF THEIR RESPECTIVE AFFILIATES THAT WOULD, OR WHICH IS INTENDED TO, PERMIT A PUBLIC OFFER OF THE SECURITIES IN ANY JURISDICTION OR POSSESSION OR DISTRIBUTION OF THIS ANNOUNCEMENT OR ANY OTHER OFFERING OR PUBLICITY MATERIAL RELATING TO THE SECURITIES IN ANY JURISDICTION WHERE ACTION FOR THAT PURPOSE IS REQUIRED. PERSONS INTO WHOSE POSSESSION THIS ANNOUNCEMENT COMES ARE REQUIRED BY YORK HOLDINGS II, YORK HOLDINGS III AND THE MANAGERS TO INFORM THEMSELVES ABOUT AND TO OBSERVE ANY APPLICABLE RESTRICTIONS.

NO PROSPECTUS OR OFFERING DOCUMENT HAS BEEN OR WILL BE PREPARED IN CONNECTION WITH THE PLACING. ANY INVESTMENT DECISION IN CONNECTION WITH THE PLACING MUST BE MADE SOLELY ON THE BASIS OF PUBLICLY AVAILABLE INFORMATION RELATING TO THE COMPANY AND ITS SHARES. SUCH INFORMATION HAS NOT BEEN INDEPENDENTLY VERIFIED AND BLACKSTONE, THOMSON REUTERS, YORK HOLDINGS II, YORK HOLDINGS III, BCP YORK AND THE MANAGERS ARE NOT RESPONSIBLE, AND EXPRESSLY DISCLAIM ANY LIABILITY, FOR SUCH INFORMATION. THE INFORMATION CONTAINED IN THIS ANNOUNCEMENT IS FOR BACKGROUND PURPOSES ONLY AND DOES NOT PURPORT TO BE FULL OR COMPLETE. NO RELIANCE MAY BE PLACED FOR ANY PURPOSES WHATSOEVER ON THE INFORMATION CONTAINED IN THIS ANNOUNCEMENT OR ON ITS ACCURACY OR COMPLETENESS.

IN CONNECTION WITH THE PLACING, THE MANAGERS AND ANY OF THEIR AFFILIATES ACTING AS INVESTORS FOR THEIR OWN ACCOUNT MAY TAKE UP AS A PROPRIETARY POSITION ANY VOTING SHARES AND IN THAT CAPACITY MAY RETAIN, PURCHASE OR SELL FOR THEIR OWN ACCOUNT SUCH VOTING SHARES. IN ADDITION, THE MANAGERS OR THEIR AFFILIATES MAY ENTER INTO FINANCING ARRANGEMENTS AND SWAPS WITH INVESTORS IN CONNECTION WITH WHICH THE MANAGERS (OR THEIR AFFILIATES) MAY FROM TIME TO TIME ACQUIRE, HOLD OR DISPOSE OF VOTING SHARES. CERTAIN OF THE MANAGERS AND ANY OF THEIR AFFILIATES HAVE ENTERED INTO, AND MAY ALSO IN THE FUTURE ENTER INTO, FOR THEIR OWN ACCOUNT, FINANCING ARRANGEMENTS WITH BCP YORK AND/OR ITS AFFILIATES. BCP YORK AND/OR ITS AFFILIATES MAY USE ALL OR PART OF THEIR SHARE OF THE PROCEEDS OF THE PLACING TO REPAY ANY INDEBTEDNESS UNDER SUCH FINANCING ARRANGEMENTS. THE MANAGERS DO NOT INTEND TO DISCLOSE THE EXTENT OF ANY SUCH INVESTMENT OR TRANSACTIONS OTHERWISE THAN IN ACCORDANCE WITH ANY LEGAL OR REGULATORY OBLIGATION TO DO SO.

THIS ANNOUNCEMENT DOES NOT CONSTITUTE A RECOMMENDATION CONCERNING THE PLACING. THE PRICE AND VALUE OF SECURITIES AND ANY INCOME FROM THEM CAN GO DOWN AS WELL AS UP. PAST PERFORMANCE IS NOT A GUIDE TO FUTURE PERFORMANCE. ACQUIRING SHARES TO WHICH THIS ANNOUNCEMENT RELATES MAY EXPOSE AN INVESTOR TO A SIGNIFICANT RISK OF LOSING ALL OF THE AMOUNT INVESTED. POTENTIAL INVESTORS SHOULD CONSULT A PROFESSIONAL ADVISOR AS TO THE SUITABILITY OF THE PLACING FOR THE ENTITY OR PERSON CONCERNED. THIS ANNOUNCEMENT DOES NOT REPRESENT THE ANNOUNCEMENT OF A DEFINITIVE AGREEMENT TO PROCEED WITH THE PLACING AND, ACCORDINGLY, THERE CAN BE NO CERTAINTY THAT THE PLACING WILL PROCEED. YORK HOLDINGS II, YORK HOLDINGS III AND THE MANAGERS RESERVE THE RIGHT NOT TO PROCEED WITH THE PLACING OR TO VARY THE TERMS OF THE PLACING IN ANY WAY.

CERTAIN FIGURES CONTAINED IN THIS ANNOUNCEMENT HAVE BEEN SUBJECT TO ROUNDING ADJUSTMENTS. ACCORDINGLY, IN CERTAIN INSTANCES, THE SUM OR PERCENTAGE CHANGE OF THE NUMBERS CONTAINED IN THIS ANNOUNCEMENT MAY NOT CONFORM EXACTLY WITH THE TOTAL FIGURE GIVEN.

EACH OF BARCLAYS, BOFA SECURITIES, CITIGROUP, GOLDMAN SACHS, J.P. MORGAN CAZENOVE, AND MORGAN STANLEY IS AUTHORISED BY THE PRUDENTIAL REGULATION AUTHORITY ("PRA") AND REGULATED IN THE UNITED KINGDOM BY THE FINANCIAL CONDUCT AUTHORITY ("FCA") AND THE PRA.

THE MANAGERS ARE ACTING ONLY FOR YORK HOLDINGS II AND YORK HOLDINGS III IN CONNECTION WITH THE PLACING AND NO ONE ELSE, AND WILL NEITHER BE RESPONSIBLE TO ANYONE OTHER THAN YORK HOLDINGS II AND YORK HOLDINGS III FOR PROVIDING THE PROTECTIONS OFFERED TO CLIENTS NOR FOR PROVIDING ADVICE IN RELATION TO THE SALE SHARES OR THE PLACING, THE CONTENTS OF THIS ANNOUNCEMENT OR ANY TRANSACTION, ARRANGEMENT OR OTHER MATTER REFERRED TO IN THIS ANNOUNCEMENT.

BLACKSTONE CAPITAL MARKETS, A CO-LEAD MANAGER, IS ALSO AN AFFILIATE OF INVESTMENT FUNDS MANAGED BY BLACKSTONE THAT ARE INDIRECTLY INVESTED IN THE CONSORTIUM.

THIS ANNOUNCEMENT INCLUDES STATEMENTS THAT ARE, OR MAY BE DEEMED TO BE, FORWARD-LOOKING STATEMENTS. THESE FORWARD-LOOKING STATEMENTS MAY BE IDENTIFIED BY THE USE OF FORWARD-LOOKING TERMINOLOGY, INCLUDING THE TERMS "INTENDS", "EXPECTS", "WILL", OR "MAY", OR, IN EACH CASE, THEIR NEGATIVE OR OTHER VARIATIONS OR COMPARABLE TERMINOLOGY, OR BY DISCUSSIONS OF STRATEGY, PLANS, OBJECTIVES, GOALS, FUTURE EVENTS OR INTENTIONS. THESE FORWARD-LOOKING STATEMENTS INCLUDE ALL MATTERS THAT ARE NOT HISTORICAL FACTS AND INCLUDE STATEMENTS REGARDING INTENTIONS, BELIEFS OR CURRENT EXPECTATIONS. NO ASSURANCES CAN BE GIVEN THAT THE FORWARD-LOOKING STATEMENTS IN THIS ANNOUNCEMENT WILL BE REALISED. AS A RESULT, NO UNDUE RELIANCE SHOULD BE PLACED ON THESE FORWARD-LOOKING STATEMENTS AS A PREDICTION OF ACTUAL EVENTS OR OTHERWISE.