- Accurate Software
 - Specializes in reconciliation software, exception management software, workflow and business intelligence, and operational risk management solutions. - ACE Software Solutions
- Provides straight through processing software solutions.
- Albion Business Machines Limited
- Offers packaged and bespoke software for direct debit, electronic funds transfer (BACS), and automated batch fax applications.
- Alphametrics Ltd
- Provides software and consultancy solutions for business with particular expertise in financial trading and economics.
- Aperta Limited
- Provides payment processing solutions and applications for the banking and financial marketplace.
- Demica plc.
- Offers Citadel wholesale banking systems, treasury systems, and capital market systems.
- Eiger Systems Limited (1)
- Financial Objects (1)
- Forbis
- Designs software for the banking sector.
- Future State Technology Limited
- Provides reconciliation software packages for investment banks, fund managers, and stockbrokers.
- Lynx Financial Systems
- Orbigo Solutions Ltd.
- Specializes in designing, developing, and deploying banking software solutions based on the J2EE platform.
- RAFT International
- Supplies component-based solutions to the financial services industry, specialising in credit risk, collateral, wealth, and risk management.
- SyMTec Solutions Ltd.
- Specializing in financial messaging software.
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