Clare Sibson KC

Clare Sibson KC

Called to the Bar - 1997
Queen's Counsel - 2016 | King's Counsel - 2022

“Incredibly clever and eloquent... has that touch of magic.  You sometimes think that if you worked hard enough you could do it to her standard, but you can’t.”
Chambers and Partners

Clare Sibson is a leading silk and considered one of the brightest legal minds at the Bar. "Fiercely intelligent with a lot of emotional intelligence as well, so clients love her. She really fights her corner for them." She is a prescient tactician and her cross-examinations are renowned.

Over 25 years in practice, Clare has advocated for individuals in the most serious and complex cases within her fields, both at first instance and on appeal. Currently, she represents Richard Howson, former CEO of Carillion PLC, in Disqualification Proceedings before the Chancery Division of the High Court: the case concerns the largest liquidation in UK history. She advises individuals in connection with the SFO’s ongoing corruption investigations of the Rio Tinto Group and of Glencore. Previously, she successfully defended John Varley in the first Barclays-Qatar trial, Colin Bermingham in his first Euribor trial, and Rebekah Brooks in the nine- month phone hacking trial. She advised Sir Cliff Richard in relation to the now closed South Yorkshire Police investigation and she represented Robert Tchenguiz in his successful High Court challenge of search warrants, following the collapse of the Kaupthing Bank. In 2011, she represented David Mabey on charges of UN sanctions violation.

In corporate law, Clare brings unique depth of experience to the intersection between criminal and regulatory risk, commercial obligations and directors’ fiduciary duties. In October 2021, she represented Petrofac Ltd before the Crown Court in relation to a ground-breaking plea agreement for failure to prevent bribery in three jurisdictions. She advised Deloitte in relation to the FRC’s investigation of its audit work for SERCO, which settled in 2019. In 2017, she represented Tesco in DPA proceedings; in 2015 she successfully defended Olympus Corporation on Companies Act charges at first instance and on the prosecution’s appeal. In the noughties, she represented the FSA in relation to the Shell Oil Reserves Scandal, and she defended the Ranbaxy pharmaceutical group - from the Magistrates’ Court to the House of Lords - in the SFO’s failed attempt to prosecute alleged cartel activity under the common law. Very recently she was, as a criminal specialist, the first port of call for the operator of a major government franchise agreement, on discovery of potential irregularities in its accounts.

Clare has a significant advisory practice addressing the criminal and regulatory dimensions of commercial situations involving matters such as insurance arrangements, mergers, securities trading, and trade secrets. Her work has included giving real-time advice on anti-terrorist legislation in the context of live negotiations for the release of hostages.

Clare attended comprehensive state schools in London and the Midlands. She graduated from Cambridge University with a first-class degree, being ranked second out of 269 law finalists in 1996. She contributes to major practitioners’ reference texts, including the primary Chancery guide to company directors’ liabilities. As well as being a barrister, Clare is Executive Director of Together Productions – a community interest company that provides performance arts projects aimed at building bridges between diverse people, who would otherwise be unlikely to meet. She lives in South London with her three children and a highly energetic dog.

Clare Sibson KC The Legal 500 – The Clients Guide to Law Firms