Sidley has received 11 practice rankings and 37 lawyer rankings in the Chambers UK 2026 guide. Each year, Chambers and Partners conducts in-depth interviews with thousands of lawyers and clients to identify the top lawyers, legal departments, and law firms in the United Kingdom.
Significantly, Tom Thesing has been ranked as an Eminent Practitioner in Corporate/M&A: £100-800 million (London). This recognition is reserved for "highly influential lawyers in a particular practice area," and is an acknowledgement of Tom's ability to balance his active practice with his leadership roles within the firm, including his position as managing partner of Sidley's London office and his roles on Sidley's Management and Executive Committees.
Furthermore, the following lawyers have been ranked in Band 1 in their respective fields, indicating their status as leading lawyers in the market.
- Sara George – Financial Services: Contentious Regulatory (Individuals) (UK-wide)
- Maria Isabel Manley – Life Sciences: Regulatory (UK-wide)
- Jayanthi Sadanandan – Leveraged Finance: Big Ticket (London)
Sidley has been ranked in the following areas:
- Capital Markets: Debt (UK-wide)
- Competition Law (London)
- Corporate/M&A: £100-800 million (London)
- Data Protection & Information Law (UK-wide)
- Financial Services: Non-contentious Regulatory (UK-wide)
- Infrastructure (UK-wide)
- Insurance: Non-contentious (UK-wide)
- Leveraged Finance: Borrowers/Sponsors: Big Ticket (London)
- Life Sciences: Regulatory (UK-wide)
- Private Equity: Buyouts: £500 million and above (UK-wide)
- Tax (London)
