London Stock Exchange Group
London Stock Exchange Group is a British global financial-markets infrastructure and data group that operates exchanges, clearing houses, index businesses, trading technology and financial information services.
Last updated October 14, 2026
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Overview
London Stock Exchange Group plc, commonly known as LSEG, is a British financial-markets infrastructure and information-services group headquartered in London. The group was created in 2007 when the London Stock Exchange acquired Borsa Italiana, transforming the London exchange from a principally national securities venue into a broader international business spanning trading, post-trade services, indices, market data, analytics and technology. LSEG's best-known asset is the London Stock Exchange, one of Europe's major securities markets. Its wider operations have included the Italian exchange infrastructure inherited from Borsa Italiana, central-counterparty and settlement services, the FTSE Russell index business, LSEG Technology, and a controlling interest in LCH. The group also has a significant interest in Tradeweb, a global electronic marketplace for fixed-income and other financial products. Through these businesses, LSEG serves listed companies, investment banks, asset managers, trading firms, governments, market participants and other financial institutions. The group's development has been shaped by consolidation in global exchanges. Its 2007 Borsa Italiana transaction expanded its geographic reach and product mix. It subsequently invested in trading technology through Millennium Information Technologies, developed its position in clearing through LCH, and acquired Frank Russell Company in 2014–2015. The Russell acquisition was combined with the existing FTSE business to create FTSE Russell, a major provider of equity, fixed-income and multi-asset benchmarks and indexes. LSEG's proposed combination with Deutsche Börse was blocked by the European Commission in 2017 on competition grounds. In 2018, Thomson Reuters and Blackstone created Refinitiv from Thomson Reuters' Financial & Risk business. LSEG agreed to acquire Refinitiv in 2019 in an all-share transaction valued at approximately US$27 billion, subject to regulatory remedies and the divestment of Borsa Italiana. Euronext completed its acquisition of Borsa Italiana in 2021, while Refinitiv became a central part of LSEG's data and analytics strategy. The Refinitiv transaction substantially broadened LSEG's market-data, workflow and analytics capabilities. In 2023, the group announced that it would retire the Refinitiv name across its businesses, including the planned rebranding of Refinitiv Workspace as LSEG Workspace. The group has also explored digital-market infrastructure using distributed-ledger technology, reflecting its interest in applying new technology to the issuance and trading of conventional financial assets. LSEG is therefore positioned less as a single exchange brand than as a diversified financial infrastructure house. Its activities connect primary-market fundraising, secondary-market trading, clearing, settlement, benchmark production, data distribution, analytics and workflow software. The London Stock Exchange remains its historical anchor, but the group's modern identity is built around the integration of venues, post-trade systems, indexes, technology and institutional data services.
History
The institutional roots of LSEG lie in the London Stock Exchange, founded in 1801 in Sweeting's Alley and moved to Capel Court the following year. The exchange later moved to a purpose-built Threadneedle Street building in 1972. The 1986 deregulation known as the Big Bang changed the structure of the British securities industry by permitting external ownership of member firms and accelerating electronic and institutional trading. The Alternative Investment Market launched in 1995, and the exchange moved to Paternoster Square in 2004. In 2006, Nasdaq accumulated a substantial stake in the London Stock Exchange after an informal approach was rejected. Nasdaq later sold its investment. The decisive transformation came in 2007, when the London Stock Exchange acquired Borsa Italiana in an all-share transaction. The enlarged business adopted the London Stock Exchange Group name, combining British and Italian exchange operations and gaining access to clearing, settlement and trading businesses associated with the Italian market. LSEG continued to expand its technology and market-infrastructure capabilities. In 2009 it acquired Millennium Information Technologies, a Sri Lankan developer of trading systems. Its technology platform, later known as Millennium Exchange and LSEG Technology, became an important component of the group's offering to exchanges and other market operators. LSEG also took a majority interest in the pan-European trading venue Turquoise and later increased its role in LCH, one of the world's major clearing houses. The group pursued several large-scale consolidation opportunities. A proposed 2011 combination with TMX Group was terminated after shareholder approval appeared unlikely in the face of a competing Canadian proposal. LSEG acquired a minority interest in the Delhi Stock Exchange in 2012 and joined the United Nations Sustainable Stock Exchanges initiative in 2014. In the same period it agreed to acquire Frank Russell Company. The transaction, completed in 2015, brought Russell's index activities together with FTSE to form FTSE Russell, making indexes a core pillar alongside exchange and post-trade services. In 2016 LSEG agreed with Deutsche Börse to pursue a merger under a new holding company. The planned combination would have joined two of Europe's leading exchange groups, but the European Commission blocked it in March 2017. The regulator determined that the transaction would substantially reduce competition in fixed-income clearing and create a de facto monopoly in relevant markets. LSEG then continued to pursue growth through targeted data, analytics and technology acquisitions, including Mergent and the Yield Book and Citi Fixed Income Indices businesses. A new phase began in 2018, when Thomson Reuters' Financial & Risk business was combined with Blackstone's investment to form Refinitiv. LSEG agreed in 2019 to acquire Refinitiv in an all-share transaction valued at about US$27 billion. The deal attracted extensive regulatory scrutiny and required remedies, including the sale of Borsa Italiana and related Italian assets. Hong Kong Exchanges and Clearing also made an unsolicited proposal for LSEG in 2019, but LSEG rejected it while continuing with the Refinitiv transaction. The Italian divestment was agreed with Euronext in 2020 and completed in 2021. Refinitiv thereby became part of LSEG, greatly increasing the group's presence in market data, analytics, financial-institution workflow and desktop technology. David Craig led Refinitiv through the completion period and left the business at the end of 2021. In 2023 LSEG announced a move to retire the Refinitiv identity and place its products under the LSEG brand, beginning with the change from Refinitiv Workspace to LSEG Workspace. Today, LSEG is organized around a portfolio of financial-market infrastructure and information businesses. Its activities cover the London Stock Exchange, clearing through LCH, indexes through FTSE Russell, trading technology, data and analytics, and electronic markets including its interest in Tradeweb. The group's strategy emphasizes connecting capital formation, trading, clearing, settlement, benchmarking and institutional decision-making through integrated technology and information services. It has also explored a digital-markets business using blockchain-based infrastructure for conventional financial assets.
- 2023
Refinitiv name retirement announced
[1]LSEG announced that Refinitiv products would progressively adopt LSEG branding.
- 2021
Borsa Italiana divestment completed
[1]Euronext completed its acquisition of Borsa Italiana as part of the regulatory remedy process for the Refinitiv transaction.
- 2019
Refinitiv acquisition announced
[1]LSEG announced a major all-share transaction to acquire Refinitiv and expand its data and analytics franchise.
- 2017
Deutsche Börse merger blocked
[1]European competition authorities prohibited the proposed merger on fixed-income clearing grounds.
- 2015
FTSE Russell formed
[1]The FTSE and Russell index businesses were combined following LSEG's acquisition of Frank Russell Company.
- 2009
Millennium Information Technologies acquired
[1]The acquisition added proprietary trading-system development capabilities to the group.
- 2007
LSEG created through Borsa Italiana acquisition
[1]The London Stock Exchange combined with Borsa Italiana, creating the London Stock Exchange Group.
- 1995
Alternative Investment Market launched
[1]The London Stock Exchange introduced AIM for smaller and growing companies.
- 1986
Big Bang deregulation
[1]Deregulation permitted external ownership of member firms and accelerated structural change in the London securities market.
- 1801
London Stock Exchange founded
[1]The institutional predecessor of LSEG was established in Sweeting's Alley in London.
Products and positioning
A global provider of financial-market infrastructure, data, indexes, analytics and technology, combining exchange operations with post-trade and information services.
Stock exchange · 1801
London Stock Exchange
The London Stock Exchange is LSEG's historic exchange business and a major venue for the listing and trading of equities, bonds, exchange-traded products and other securities. It serves issuers seeking access to public capital and investors trading securities in the UK and international markets. Its market structure includes the Main Market and the Alternative Investment Market, with services supporting admission, trading, disclosure and market data.
Indexes and benchmarks · 2015
FTSE Russell
FTSE Russell develops and administers equity, fixed-income, real-asset and multi-asset indexes used for benchmarking, passive investment products, portfolio construction and performance measurement. It was created by combining LSEG's FTSE business with the Russell index activities acquired from Frank Russell Company. Its benchmarks are used by asset owners, fund managers, exchange-traded-product providers and other financial institutions.
Central clearing
LCH
LCH provides central-counterparty clearing for a range of financial markets, including interest-rate, equity, commodity and other derivatives and securities transactions. By interposing itself between trading counterparties and managing collateral and default procedures, the clearing house is designed to reduce bilateral counterparty exposure and support orderly post-trade processing. LSEG holds a controlling interest in LCH.
Market data and workflow · 2023
LSEG Workspace
LSEG Workspace is an institutional market-data and workflow platform developed through the integration of LSEG's information businesses and the former Refinitiv product portfolio. It provides financial professionals with market information, company data, analytics, news and workflow tools. The product name replaced Refinitiv Workspace as part of LSEG's plan to retire the Refinitiv brand.
Trading technology · 2009
LSEG Technology
LSEG Technology supplies exchange and market-infrastructure technology, including the Millennium Exchange trading platform and matching-engine capabilities. The business originated with Millennium Information Technologies, acquired in 2009. Its systems are designed for high-volume electronic markets and have been used by exchanges and other trading venues seeking configurable, low-latency market infrastructure.
Fixed-income analytics · 2017
The Yield Book and Citi Fixed Income Indices
The Yield Book provides fixed-income analytics and valuation tools, while the Citi Fixed Income Indices business supplies benchmarks covering bond markets. LSEG announced the acquisition of these assets in 2017, strengthening its capabilities in fixed-income pricing, risk analysis, portfolio construction and index-based investment.
Marketing campaigns
- 2014Sustainable Stock Exchanges participation
Global
LSEG joined the United Nations Sustainable Stock Exchanges initiative, signaling participation in an international effort to promote sustainability-related practices and responsible investment across exchanges.
Outcome. The group became the tenth stock exchange to join the initiative.
Brand decisions
2023
Retire the Refinitiv nameStrategyBackground
Following the integration of Refinitiv, LSEG sought a more unified group identity across its data, analytics and workflow products.
Action taken
The group announced that it would progressively replace Refinitiv branding, beginning with the change from Refinitiv Workspace to LSEG Workspace.
Aftermath
The move consolidated customer-facing products under the LSEG brand while preserving the underlying data and workflow capabilities.
2020
Sell Borsa Italiana to EuronextM&ABackground
The divestment was considered in response to regulatory concerns arising from the planned Refinitiv acquisition.
Action taken
LSEG agreed to sell Borsa Italiana and related Italian assets to Euronext.
Aftermath
The transaction closed in 2021 and helped satisfy competition-related conditions for the Refinitiv deal.
2019
Acquire RefinitivM&ABackground
LSEG sought to expand beyond exchange operations into global market data, analytics, financial information and institutional workflow services.
Action taken
It agreed to acquire Refinitiv in an all-share transaction and pursued regulatory approval alongside a divestment program.
Aftermath
The transaction substantially expanded LSEG's data and analytics operations and made Refinitiv a core part of its business before the brand was progressively retired.
Transaction value. Approximately US$27 billion (2019 announced valuation)
2017
Abandon Deutsche Börse mergerM&ABackground
The proposed combination was intended to create a large European exchange group but faced competition concerns, particularly in fixed-income clearing.
Action taken
The merger was blocked by the European Commission after LSEG declined to sell the relevant Italian fixed-income trading platform as a remedy.
Aftermath
The planned combination did not proceed, and LSEG continued its independent acquisition and diversification strategy.
2015
Create FTSE RussellM&ABackground
LSEG wanted to strengthen recurring index and benchmark revenues alongside its exchange and post-trade activities.
Action taken
It combined the FTSE business with Russell indexes following the acquisition of Frank Russell Company.
Aftermath
FTSE Russell became a major global index provider serving benchmark, passive-investment and asset-allocation needs.
2011
Terminate proposed TMX Group combinationM&ABackground
LSEG and TMX Group had proposed a combination described by the parties as a merger of equals, but a competing Canadian bid and shareholder opposition threatened approval.
Action taken
LSEG and TMX terminated the proposed transaction after determining that the required shareholder majority was unlikely.
Aftermath
The companies remained separate and TMX became the subject of a competing proposal from the Maple Group.
2007
Acquire Borsa ItalianaM&ABackground
The London Stock Exchange sought greater scale, geographic diversification and a broader product offering in the increasingly consolidated exchange industry.
Action taken
It completed an all-share acquisition of Borsa Italiana and established London Stock Exchange Group.
Aftermath
The enlarged group gained Italian exchange, clearing and settlement operations and a broader European customer base.
Transaction value. Approximately €1.6 billion (2007)
Recent events
LSEG to buy Octus[2]
Reported:
Reuters reported that LSEG is to buy Octus in a $3.5 billion data analytics deal.
Google Cloud launches Gemini Enterprise for Financial Services and Legal[3]
Reported:
Google Cloud announced Gemini Enterprise for Financial Services and Gemini Enterprise for Legal, the first in a planned series of industry-specific solutions built on its Gemini Enterprise platform. The financial-services product includes a Google-managed Financial Research agent, more than 50 specialized skills and 13 data connectors to providers including FactSet, LSEG, Moody's and MSCI, with Deutsche Bank as a design partner and CME Group among early users. The legal product targets contract review, due diligence, regulatory monitoring, legal research and privacy requests, connecting with iManage, NetDocuments, RelativityOne, Thomson Reuters, Harvey and CourtListener, with law firms including Cleary, Freshfields, Weil and Williams & Connolly among launch customers.
- Unconfirmed
LSEG completes acquisition of Refinitiv[4]
Reported:
London Stock Exchange Group (LSEG) announced the successful completion of its all-share acquisition of Refinitiv; the two businesses combined as a financial markets infrastructure and data provider.
Thomson Reuters and Blackstone close sale of Refinitiv to LSEG[5]
Reported:
Thomson Reuters and private equity funds affiliated with Blackstone closed the sale of Refinitiv to London Stock Exchange Group plc in an all-share transaction.
LSEG names Anthony McCarthy as CIO[6]
Reported:
London Stock Exchange Group announced that Anthony McCarthy, then CIO of LCH Group and LCH Ltd., would assume the role of Chief Information Officer, LSEG. The source does not specify when he would take up the role.
LSEG announces David Shalders as COO[6]
Reported:
London Stock Exchange Group announced that David Shalders would assume the role of COO, LSEG, on 1 January 2020, in addition to his Chief Integration Officer responsibilities.
LSEG announces Chris Corrado’s planned departure[6]
Reported:
London Stock Exchange Group announced that Chief Information Officer and Chief Operating Officer Chris Corrado had decided to leave the Group at the end of the first quarter of 2020.
- Unconfirmed
AAX joins London Stock Exchange Group partner platform[7]
Reported:
AAX became the first digital-asset trading platform to join London Stock Exchange Group's partner platform, under their technology cooperation relationship. The platform enables AAX to extend services to Europe, North America and Asia.
Hong Kong Exchanges and Clearing withdraws offer for London Stock Exchange Group[8]
Reported:
Hong Kong Exchanges and Clearing announced that it would not continue its offer to acquire London Stock Exchange Group, ending its proposed combination with the company.
Sources11 sources
- 1London Stock Exchange Groupen.wikipedia.org
- 2伦敦证券交易所集团拟收购 Octusnews.google.com
- 3谷歌云推出面向金融与法律行业的Gemini Enterprise解决方案techmoran.com
- 4LSEG完成对Refinitiv的收购ft.lk
- 5汤森路透与黑石完成向伦敦证券交易所集团出售Refinitivprnewswire.com
- 6LSEG任命安东尼·麦卡锡为首席信息官finanznachrichten.de
- 7AAX加入伦敦证券交易所集团合作伙伴平台world.people.com.cn
- 8香港交易所放弃收购伦敦证券交易所集团的要约finance.sina.com.cn
- 9港交所放弃对伦交所的收购要约finance.sina.com.cn
- 10港交所放弃收购伦交所盘中涨近3% “提亲”细节披露finance.sina.com.cn
- 11港交所宣布放弃收购伦交所finance.sina.com.cn
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