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Guy Antrobus



Antrobus Guy
Guy Antrobus



Guy was the lead English lawyer advising ISDA on the updated English law Initial Margin Credit Support documentation resulting from the WGMR initiative. Guy also authored all of the ISDA WGMR English law collateral opinions.

Guy was the lead lawyer advising a number of major dealers in the derivatives markets on the implementation of their collateral documentation resulting from WGMR, including on the Prime Services side.

Guy also advised ISDA on the ISDA 2016 Bail-in Article 55 BRRD Protocol.

Guy’s practice has a particular focus on issues relating to the EU 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, including the ISDA English law industry opinions.

On the transactional side, Guy advises on all manner of OTC structured products, including TRS, financial guarantees, credit derivatives and stock lending/repo.

Guy is a member of various FMLC committees and the Secured Transactions Law Reform Project.

News & insights

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News: 14 OCTOBER 2021

A&O advises on c.EUR2.75 billion loan and high yield financing for Brookfield’s acquisition of Modulaire

Allen & Overy’s leveraged finance team has advised Brookfield Business Partners (Brookfield) on a c.EUR2.75 billion loan and high yield financing package comprising a EUR1.26bn sustainability-linked…

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Publications: 12 OCTOBER 2021

EU Securitisation Regulation – The end of tax notification obligation for European investors in Australian securitisations

On 5 October 2021, some good news for the Australian securitisation market came from the EU following a decision by the Council (linked here) to recognise that Australia has implemented all the…

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Publications: 05 OCTOBER 2021

LIBOR transition and loan hedging: basis risk and how to deal with it

Global LIBOR transition efforts continue apace.  However, switching hedged loans to risk free rates is a particularly challenging area.  We discuss what borrowers, lenders and hedge providers really…

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Publications: 22 MAY 2020

UK Insolvency Reforms and Derivatives: Impact of the prohibition on the operation of termination and certain other provisions

The UK Corporate Insolvency and Governance Bill (CIGB) was introduced to Parliament on 20 May 2020 and proposes to support the real economy by introducing certain reforms to give companies increased…

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Allen & Overy LLP
One Bishops Square
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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