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Gresham appoints Giannaros as CEO
01 July 2026 UK
Image: Gresham
Gresham, an enterprise data automation for the financial services industry, has appointed Spiros Giannaros as CEO, succeeding 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.
Prior to Charles River, Giannaros served as partner and senior vice president 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 firm notes.
Marc Bala, managing director at STG, the owners of Gresham, says: “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.
“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.”
Giannaros adds: “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.
“I am excited to work with this talented team and with STG to realise that potential and deliver increased value and innovation for our customers.”
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.
Prior to Charles River, Giannaros served as partner and senior vice president 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 firm notes.
Marc Bala, managing director at STG, the owners of Gresham, says: “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.
“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.”
Giannaros adds: “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.
“I am excited to work with this talented team and with STG to realise that potential and deliver increased value and innovation for our customers.”
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