Stuart O’Brien



Stuart has experience of a broad range of pension related matters, advising employers and trustees alike with a particular emphasis on finance and investment issues.  This includes buy-ins and buy-outs, de-risking and advising on the legal aspects of scheme funding issues, including the use of contingent assets.

Stuart also has a keen interest in environmental, social and corporate governance (ESG) issues, stewardship, responsible and impact investing.

Stuart’s advice includes making changes to pension benefits (including the closure of schemes to future accrual), liability management exercises including pension increase exchange and pre-retirement transfer exercises, as well as scheme mergers, demergers, and solvent and insolvent wind-ups.

He also has significant expertise advising on the pensions aspects of corporate mergers, acquisitions and restructuring, dealing with Pensions Regulator clearance, section 75 debts, and apportionment and withdrawal arrangements.

Stuart is chair of the TCFD guidance working group (Taskforce on Climate-related Financial Disclosures), and a member of the Security of DC Assets Working Party.

Recent experience

  • Assisting clients with the settlement of deferred and pensioner liabilities via buy-in and buy-out bulk annuity transactions totalling more than £2bn in aggregate, including assisting the trustees of the Friends Provident Pension Scheme on their ground breaking collateralised buy-in of pensioner liabilities with Aviva in 2008, as well as numerous other transactions with all major insurers over the last decade
  • Advising Trustees on ESG matters in investment strategy and decision making
  • Advising Trustees on DC investment issues, including the use of platform structures, asset security and the transition of member funds
  • Advising Trustees on the creation of a £300m bespoke contingent funding vehicle with standalone investment management and custody agreements.

Memberships and Qualifications

Membership of professional bodies:
Association of Pension Lawyers
(Full Member and Investment Committee Member)
Pensions Management Institute (Ordinary Member)

Career history

Qualified: 2003, England & Wales

Pensions experience since: 2003

Joined Sackers: 2003, Associate: 2008

Joined partnership/LLP: 2011

Employers: Hammonds (2001-2003)

Academic history


Nottingham Law School (2000-2001)
University of Texas Law School, Austin, USA (1998-1999)
University of Nottingham (1996-2000)

Degree: LLB (with merit in American Law), Nottingham University
Legal Practice Course

Further Information


  • “I have always been impressed by Stuart’s ability to explain complex matters in plain English, and for his pragmatic approach. As a car manufacturer, costs will always be an issue, and Stuart carries out work for us mindful of the need to contain costs, whilst providing an excellent service”.
    Roland Craven, Senior Controller, Pensions Section, Nissan Motor Manufacturing (UK) Ltd
  • He is “pragmatic and does not waffle”. Legal 500 2014 recommended lawyer


Contingent assets

DB Investment

DC Investment

Banking and finance

Buy-ins and buy-outs


Latest News & Media

Stuart O’Brien comments on landmark vegan case and its impact on pension funds

New trustee guidance on climate-related issues to be produced by Pensions Climate Risk Industry Group

Stuart O’Brien outlines the latest changes to SIPs and actions trustees should to for compliance in Pension Funds Insider

Sackers announces results of ESG survey

Stuart O’Brien speaks on ESG and climate change at Pensions Investment Academy

Sackers ESG guide shortlisted in two categories in Pensions for Purpose Content Awards 2019

Sackers ESG guide awarded Best Thought Leadership Paper on Sustainable Investing

Stuart O’Brien chairs TCFD working group

Stuart O’Brien speaks at London Climate Action event for pension funds

Stuart O’Brien warns employers to be aware of SIP updates in Employee Benefits blog

Latest Knowledge

Sackers ESG survey for pension schemes: Summary report – key themes and Sackers views

Buy-ins, buy-outs and longevity transactions – A guide for trustees 2019

ESG and climate change for pension funds – Putting the law into practice

Finance & investment briefing – March 2019

Finance & investment briefing – December 2018

Government response: clarifying and strengthening trustees’ investment duties

Pension trustees: clarifying and strengthening investment duties

Finance & investment briefing – September 2018

Consultation on clarifying and strengthening trustees’ investment duties

Where next for ESG? – An evolving approach for trustees