Gresham names Spiros Giannaros CEO, succeeding Mark Hepsworth

  • STG Partners said Gresham named Spiros Giannaros CEO, succeeding Mark Hepsworth, who will move to a board role.
  • Giannaros previously served as president and CEO of Charles River Development, leading platform strategy for State Street Alpha.
  • He earlier ran Markit EDM as partner and SVP at Markit, now S&P Global; Gresham acquired the business in January 2026.
  • Gresham has been expanding through acquisitions, including the S&P Global Enterprise Data Management unit, to scale its data automation platform.


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