
Contacts
- *Only admitted to practice in Illinois. Not admitted to practice in England and Wales.
About Our London Office
Overview
Located in the heart of the City, Sidley’s office in London — our largest in Europe — has served clients in the London market since 1974. Our London office is a key hub for the firm’s cross-border work, and our lawyers represent global businesses on their most complex matters across a variety of industries and areas of law. This includes such areas as antitrust and competition, capital markets, dispute resolution, employment, energy and infrastructure, global finance, insurance, investment funds, life sciences, M&A and private equity, privacy and cybersecurity, regulatory, restructuring, and tax.
Sidley has received 11 practice and 37 lawyer rankings. Client praise includes: “Sidley has exceptional commitment to client service, characterised by responsiveness, clear communication and hands-on advice enabling sophisticated and tailored legal solutions.”
Chambers UK 2026. Read more here.
About Our Team
Our lawyers in London possess a deep understanding of the laws in multiple jurisdictions, providing clients with exceptional legal representation on the full range of litigation, transactional, and regulatory matters. The breadth of our service offerings in London is an important extension of Sidley’s global platform. Our lawyers are familiar with the cultures and fluent in the languages spoken in many of the countries where our clients are based. Harnessing Sidley’s ethos of teamwork and collaboration, the lawyers in our London office work closely with colleagues across the firm to assist clients in myriad legal disciplines.
"Sidley Austin's excellent partners are supported by considerable bench strength across the team and the firm.”
Chambers UK 2025
Committed to Our Community
We are committed to investing in the success of future generations of leaders, as well as the greater London community.
Our ongoing partnership with the charity YMCA London City and North — including the recently opened VYBZ Youth Hub — allows our people to provide London youth with career guidance, as well as work experience opportunities at our London office.
Our office is equally committed to pro bono work. Sidley’s London office was honored to receive the “ESG Initiative of the Year” award at the 2024 Law.com International Women, Influence & Power in Law UK Awards in recognition of our partnership with Not Beyond Redemption, a nonprofit that helps mothers in prison re-establish contact with their children.
News & Insights
Regulation
Sidley Austin LLP is a registered limited liability partnership organised under the laws of Delaware and authorised and regulated by the Solicitors Regulation Authority (SRA No. 79075). A list of the names of the London office partners of Sidley Austin LLP is open to inspection at its principal place of business, 70 St Mary Axe, London EC3A 8BE, and such persons are either solicitors, registered foreign lawyers, European lawyers or managers authorised by the SRA.
Separate partnerships, which are affiliated with one another, are responsible for the operations of Sidley Austin’s offices around the world. Further details about our partnership structure can be found here, under “Collective Designations.”
Complaints
We are committed to providing high-quality legal services to all our clients. If you are a client and have a complaint about our professional behaviour, the services provided to you by the London office of Sidley Austin LLP, including a complaint about an invoice, please contact the partner handling the matter or your client relationship partner. If that does not resolve your complaint, you may use our complaints procedure set out below.
Complaints Procedure
- Please send your complaint in writing to contact-uk@sidley.com.
- We will send you an acknowledgment of your complaint within three working days of receiving it.
- We will review your complaint and may invite you to discuss your complaint with us.
- Once we have reviewed your complaint, we will write to you with our response, including any resolutions that have been agreed with you. Depending on the nature of your complaint, we will endeavour to provide our response within 30 days of our acknowledgement of your complaint.
- If we have not responded within 8 weeks, or if you are still not satisfied after receiving our final written response, and your complaint relates to our invoices or the legal services we provided to you, you may be able to raise your complaint with the Legal Ombudsman (www.legalombudsman.org.uk). The Legal Ombudsman deals with complaints from individuals and from small businesses, charities and associations.
- You have six months to submit your complaint to the Legal Ombudsman after receiving our final written response to your complaint. In the unlikely scenario of not receiving a response from us your complaint must be brought to the Legal Ombudsman within one year of the problem happening or one year from when you found out about it. The contact details for the Legal Ombudsman are: tel. 0300 555 0333 / enquiries@legalombudsman.org.uk.
- If your complaint relates to our professional behaviour, and you feel we have not sufficiently addressed your concerns in our final written response, you can raise a complaint to the Solicitors Regulation Authority, our professional regulator. Please see its website for details (www.sra.org).
Financial Services
Sidley Austin LLP is not authorised under the Financial Services and Markets Act 2000 but we are able to, in certain circumstances, offer a limited range of investment services to clients because we are authorised and regulated by the Solicitors' Regulation Authority, which has complaints and redress procedures.
We can only provide investment services if they are an incidental part of the legal services we have been engaged to provide.
We are not authorised by the Financial Conduct Authority (FCA). However, we are included on the register maintained by the FCA so that we can carry on insurance distribution activity, which is broadly the advising on, selling and administration of insurance contracts. This part of our business, including arrangements for complaints or redress if something goes wrong, is regulated by the Solicitors' Regulation Authority. The register can be accessed via the FCA website.
Sidley Austin LLP act as legal advisers; it is not part of our role to give advice on the merits of investment transactions. Any investment decision is for our clients to make and no communication by us should be treated as an invitation or inducement to our clients to engage in investment activity.
Modern Slavery Act Statement
This statement is made on behalf of the London office of Sidley Austin LLP pursuant to section 54(1) of the Modern Slavery Act 2015 and constitutes our slavery and human trafficking statement.
The Modern Slavery Act 2015 (“the Act”) requires large commercial organisations doing business in the UK to take steps to ensure that slavery and human trafficking are not taking place in their own businesses or in any of their supply chains, and to publish statements on their websites setting out the steps they have taken.
Sidley Austin LLP is committed to the constant improvement of our practices to prevent slavery and human trafficking from occurring within our business and supply chain. We expect the same high standards of our suppliers.
Our Business and Supply Chains
At Sidley, we strive to build and retain the best possible personnel and supply chains to support and help grow our business.
Given the nature of our business and our relatively limited supply chains, we consider the risk of slavery or human trafficking occurring in our business or supply chain to be low.
Our supply chain primarily comprises providers of goods and services, such as stationery and office equipment, that allow our personnel to provide legal advice to our clients. We also work with other sophisticated suppliers of legal services, including law firms in other jurisdictions and barristers.
Our Policies
We expect every member of the Sidley team to act in a manner which promotes the development of a workplace which is free from discrimination or harassment of any kind and which complies with all applicable laws. Our policies reflect that expectation.
It is also our policy to engage with our supply chain to confirm that our suppliers are adhering to the same high standards. In particular, key suppliers must provide details of the corporate and social responsibility policies they have in place, including in respect of issues covered by the UK Modern Slavery Act.
With regard to Sidley personnel, our policy is to provide appropriate and relevant training. In particular, training will be provided for those with procurement responsibilities, so that they are able to assess the risks of modern slavery and human trafficking in our business and supply chains.
This statement, and the steps taken by Sidley Austin LLP to ensure that our business and supply chains are free from slavery and human trafficking and to ensure that we remain in compliance with the Act, are reviewed regularly and updated as necessary.
This statement has been approved by the London partnership, represented by Thomas Thesing, the Managing Partner for the London office of Sidley Austin LLP.
This statement has been reviewed in consideration of Sidley’s activities and business for the previous financial year by Rachpal Thind, Compliance Officer for Legal Practice for the London office of Sidley Austin LLP.
For a signed copy of this statement, relating to the previous financial year please click here.






