Luke O'Sullivan
Acquiring and managing delayed market data can be complex and costly. Firms often face data quality issues and the burden of complying with changing exchange rules. Historically, many market data teams have managed the acquisition and deployment of this data in-house. However, data quality can be a significant issue, and compliance with changing rules around the timing and use of the data can be costly to resource. More firms are therefore seeking solutions which are not only cost-effective but help them to easily manage delay rules and permission requirements, whilst offering the ability to scale flexibly.
Delayed market data supports a wide range of use cases – from backtesting and risk management to software development, training, and sales enablement – but sourcing and managing it in-house often leads to data quality issues and compliance challenges.
What is delayed market data?
Delayed market data is financial instrument trade information released with a time delay – usually of 10-30 minutes – after an actual transaction. A delayed market data feed often include additional information about security prices, bid and ask prices, trading volumes and related data fields. Delayed market data is available for equities, commodities, currencies, derivatives, fixed income and more.
Usually sources, such as exchanges, that originate this data will have specific policies about how long data must be delayed for. They will also have different cost structures for delayed data. Both timing and cost policies vary over time, which is burdensome for financial firms that capture and deploy market data from these sources.
What is delayed market data used for?
There is a wide range of potential use cases for delayed market data within financial services firms today, including:
- Compliance and reporting: Meeting regulatory requirements and supporting risk oversight without relying on live data
- Analytics and research: Studying historical trends and market behaviour to inform decision-making
- Software development and testing: Building and validating applications in a controlled environment without incurring real-time data costs
- Simulation and strategy testing: Backtesting trading strategies and assessing performance under different market conditions
- Portfolio management: Reviewing prices and valuations across a broad set of instruments
- Sales and client support: Providing indicative pricing for client queries without the expense of real-time feeds
- Training, learning and development: Supporting model development and professional learning with realistic market scenarios
Although firms use delayed data across these and other use cases, often they find that sourcing and managing the data themselves can be problematic.
What are the challenges with delayed market data?
A March 2023 UK Financial Conduct Authority report found that free delayed market data from sources such as exchanges often suffers from quality issues. The report states that about a third of the users reported challenges with the usability of the data, including inconsistency in data formats and fields, and data errors. These quality challenges mean that firms must incur costs on cleaning and maintaining this data when it is sourced directly from exchanges.
In addition, the exchanges and other sources that publish delayed market data have a range of policies that must be complied with, including the timing of the delay. Firms need to have administrative resources in place to identify and implement policy changes, which can be expensive.
Finally, some methods of harvesting free delayed data means that the data is not exchange-compliant, which can lead to decision-making errors.
A simpler way to manage delayed market data
Introducing LSEG Real-Time – Delayed Optimized: a cloud-based feed delivering high-quality, exchange-compliant delayed prices. Each price release is postponed according to the publication policy of the individual content source – ensuring compliance without manual rule management or in-house infrastructure. And because LSEG automatically updates the feed to reflect policy changes, it operates closely to a managed service – removing compliance risk and operational burden. Built on the proven Real-Time – Optimized platform, it simplifies operations, reduces costs, and accelerates time to market.
- Compliance made simple: We automatically update the feed to reflect policy changes, eliminating compliance risk.
- Cost efficiency: No live exchange fees and no need for infrastructure investment.
- Rapid time to market: Easy integration with WebSocket and Real-Time SDKs using the same APIs as Real-Time – Optimized.
- Cloud-native delivery: Connect seamlessly via AWS PrivateLink, internet, or Delivery Direct.
- Scalable pricing: Flexible watchlist-based tiers to adapt to changing needs.
Real-Time – Delayed Optimized delivers the same extensive coverage as Real-Time – Optimized – over 90 million instruments, including exclusive content sets – except where delayed publication is restricted by source policy. Data is cleaned, normalised and aligned to the LSEG data model, eliminating the need for in-house maintenance and ensuring seamless integration with other LSEG datasets like machine-readable news and reference data.
Running natively in AWS, customers can easily connect from any cloud service provider, leveraging the same API technology as Real-Time – Optimized, enabling rapid deployment across the front, middle and back offices. Plus, you’ll benefit from LSEG‘s 24/7 global support and expert consulting teams, guiding you through every step of onboarding and beyond.
Legal Disclaimer
Republication or redistribution of LSE Group content is prohibited without our prior written consent.
The content of this publication is for informational purposes only and has no legal effect, does not form part of any contract, does not, and does not seek to constitute advice of any nature and no reliance should be placed upon statements contained herein. Whilst reasonable efforts have been taken to ensure that the contents of this publication are accurate and reliable, LSE Group does not guarantee that this document is free from errors or omissions; therefore, you may not rely upon the content of this document under any circumstances and you should seek your own independent legal, investment, tax and other advice. Neither We nor our affiliates shall be liable for any errors, inaccuracies or delays in the publication or any other content, or for any actions taken by you in reliance thereon.
Copyright © 2025 London Stock Exchange Group. All rights reserved.
The content of this publication is provided by London Stock Exchange Group plc, its applicable group undertakings and/or its affiliates or licensors (the “LSE Group” or “We”) exclusively.
Neither We nor our affiliates guarantee the accuracy of or endorse the views or opinions given by any third party content provider, advertiser, sponsor or other user. We may link to, reference, or promote websites, applications and/or services from third parties. You agree that We are not responsible for, and do not control such non-LSE Group websites, applications or services.
The content of this publication is for informational purposes only. All information and data contained in this publication is obtained by LSE Group from sources believed by it to be accurate and reliable. Because of the possibility of human and mechanical error as well as other factors, however, such information and data are provided "as is" without warranty of any kind. You understand and agree that this publication does not, and does not seek to, constitute advice of any nature. You may not rely upon the content of this document under any circumstances and should seek your own independent legal, tax or investment advice or opinion regarding the suitability, value or profitability of any particular security, portfolio or investment strategy. Neither We nor our affiliates shall be liable for any errors, inaccuracies or delays in the publication or any other content, or for any actions taken by you in reliance thereon. You expressly agree that your use of the publication and its content is at your sole risk.
To the fullest extent permitted by applicable law, LSE Group, expressly disclaims any representation or warranties, express or implied, including, without limitation, any representations or warranties of performance, merchantability, fitness for a particular purpose, accuracy, completeness, reliability and non-infringement. LSE Group, its subsidiaries, its affiliates and their respective shareholders, directors, officers employees, agents, advertisers, content providers and licensors (collectively referred to as the “LSE Group Parties”) disclaim all responsibility for any loss, liability or damage of any kind resulting from or related to access, use or the unavailability of the publication (or any part of it); and none of the LSE Group Parties will be liable (jointly or severally) to you for any direct, indirect, consequential, special, incidental, punitive or exemplary damages, howsoever arising, even if any member of the LSE Group Parties are advised in advance of the possibility of such damages or could have foreseen any such damages arising or resulting from the use of, or inability to use, the information contained in the publication. For the avoidance of doubt, the LSE Group Parties shall have no liability for any losses, claims, demands, actions, proceedings, damages, costs or expenses arising out of, or in any way connected with, the information contained in this document.
LSE Group is the owner of various intellectual property rights ("IPR”), including but not limited to, numerous trademarks that are used to identify, advertise, and promote LSE Group products, services and activities. Nothing contained herein should be construed as granting any licence or right to use any of the trademarks or any other LSE Group IPR for any purpose whatsoever without the written permission or applicable licence terms.