Seasoned financial technology executive brings 25+ years of leadership in enterprise data management and capital markets software to lead Gresham into next phase of growth.
Boston/New York / London, June 30th 2026 – Gresham, a global leader in enterprise data automation for the financial services industry, today announced the appointment of Spiros Giannaros as Chief Executive Officer as the company enters its next phase of growth. Giannaros will succeed Mark Hepsworth, who will transition to a board role.
Giannaros brings more than 25 years of experience building and scaling enterprise software platforms for the global capital markets industry. Most recently, he served as President and CEO of Charles River Development and head of platform strategy for State Street Alpha. At Charles River he led a front-office investment management platform servicing over $59 trillion in assets under management, supported by 2,400 employees globally. Prior to Charles River, Giannaros served as Partner and SVP at Markit (now S&P Global), where he led the global business for Markit EDM, the enterprise data management and portfolio management platforms that Gresham acquired in early 2026. Giannaros has served as an Operating Advisor to Gresham and its owners, STG, since February 2026 and has been instrumental in helping the company shape the product strategy and develop its AI product and operational roadmap.
The appointment follows a period of significant growth and transformation at Gresham, including the acquisition of S&P Global’s Enterprise Data Management business in January 2026, which materially expanded the company’s footprint in enterprise data management for global financial institutions.
“We are thrilled to introduce Spiros as the new CEO of Gresham. Spiros is an exceptional leader with an outstanding track record of driving growth and innovation in capital markets technology businesses.” said Marc Bala, Managing Director at STG, the owners of Gresham. “His prior leadership of the Markit EDM business gives him exceptional familiarity with Gresham’s products, customers, and competitive position. Spiros is the right leader to drive Gresham’s next chapter of growth and product innovation. We would also like to thank Mark for his partnership in building Gresham into the business it is today and are pleased he will continue to support the company going forward."
“Gresham is extremely well positioned to leverage the power of AI within its products and services to provide greater value and expanded benefits to customers. The company occupies a crucially important position in the financial services ecosystem, delivering intelligent business processes and data automation capabilities that global institutions depend on for their critical investment and regulatory operations,” said Spiros Giannaros, CEO of Gresham. “Having delivered for customers across these segments for over 25 years and gained a deep understanding of the financial platform ecosystem, I have conviction and belief in the quality of this platform and the strength of its customer relationships. STG’s significant investment in accelerating our product strategy will allow us to continue to build on our market leading position and deliver the next generation of AI-driven capabilities and products. I am excited to work with this talented team and with STG to realize that potential and deliver increased value and innovation for our customers.”
About STG
STG is a private equity partner to market leading companies in data, software, and analytics. The firm brings experience, flexibility, and resources to build strategic value and unlock the potential of innovative companies. Partnering with a goal to build customer-centric, market winning portfolio companies, STG seeks to create sustainable foundations for growth that bring value to existing and future stakeholders. The firm is dedicated to transforming and building outstanding technology companies in partnership with world class management teams. STG's expansive portfolio has consisted of more than 50 global companies. For more information, please visit www.stg.com.
About Gresham
Gresham is a global leader in enterprise data automation solutions for the financial services industry. Leveraging innovative modern technology and deep industry expertise, we make the complex simple, enabling firms to streamline their processes, manage risk, reduce costs, and ensure compliance. As a trusted partner to the world's leading financial institutions, our cloud and managed services for enterprise data management, data automation, reconciliation and control, and regulatory reporting ensure that business leaders can have complete confidence in their data and day-to-day operations. For more information, please visit www.greshamtech.com.