Guy Antrobus


Guy is UK Co-Head of Global Financial Markets.

On the transactional side, Guy has a particular focus on CRT/SRT risk transfer transactions. More broadly, Guy advises on all manner of structured products, including TRS, fund financing, financial guarantees, credit derivatives, risk retention financings, hedging and stock lending/repo.

On the advisory side, Guy has a particular focus on issues relating to the Financial Collateral regime and regulatory capital. He is the author of a number of industry and client-specific legal opinions on netting, insolvency and collateral enforceability. He has led on numerous matters relating to banks implementation of Initial Margin and was the lead English lawyer advising ISDA on the updated Phase 1 Initial Margin Credit Support documentation resulting from the WGMR initiative.

Leadership Positions And Professional Affiliations

  • Member, Law Society of England and Wales.



Admitted as solicitor, England and Wales, 2003

Registered foreign lawyer, Hong Kong, 2005


BA, Modern & Medieval Languages, Robinson College, Cambridge University, 1999

LPC, Nottingham Law School, 2001

MA, University of Cambridge, 2002


A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.