GBM Securities Appoints Maria Antsupova as Head of Global Markets Operations

London-based prime broker GBM Securities has appointed Maria Antsupova as Head of Operations for Global Markets, strengthening its senior operational leadership as the firm continues to expand its institutional offering.

Antsupova joins GBM from ITI Capital, where she served as Head of Operations. At ITI, she was responsible for overseeing core operational controls, managing reconciliations, addressing CASS-related issues, and implementing process improvements aligned with regulatory best practices. During her tenure, the firm also strengthened its operations team and achieved a notable improvement in its CASS audit outcome.

Prior to ITI Capital, Antsupova spent nearly nine years at Renaissance Capital. She most recently held the dual role of Head of London Operations and Global Head of Trade Support, overseeing global trade support functions across asset classes. Earlier, she led trade support teams covering equities, derivatives, FX, fixed income and repo products, with responsibility for reconciliations, settlements, reporting and new product implementation.

Her earlier career includes senior operational roles at Alfa Capital, where she served as Head of Global Markets Back Office within its asset management business, as well as Chief Specialist in the Operations Department. Across these roles, Antsupova worked closely with custodians, banks and counterparties, managed settlement and reconciliation processes, supported NAV calculations and led operational risk controls.

GBM Securities is authorised and regulated by the UK Financial Conduct Authority and serves institutional investors and family offices. The firm provides brokerage and prime brokerage services across global markets, including trade execution, clearing and settlement, portfolio optimisation, risk analysis and leverage-related solutions.

The appointment follows recent steps by GBM to strengthen its infrastructure. The firm has expanded its custody arrangements through a collaboration with BNY Pershing EMEA, adopting a Model B, tri-party custody structure that places client assets directly with the custodian rather than on GBM’s balance sheet.

The move reflects GBM’s continued focus on operational resilience, regulatory robustness and institutional-grade market access as it scales its prime brokerage platform.