TOM THESING is the managing partner of Sidley’s office in London and a member of Sidley's Management and Executive Committees. His principal areas of practice are cross-border M&A, corporate finance and strategic counseling/corporate governance. Tom represents both buyers and sellers of public and private corporations and advises boards of directors on acquisitions, corporate and financial restructuring and corporate governance-related matters. He also has experience with private equity/venture capital investments and joint ventures. Tom has significant experience in transactions in regulated industries, such as financial and payment services, healthcare and life sciences, as well as technology and internet-related businesses. Recognized most for his cross-border experience, virtually all of the transactions Tom leads include parties and businesses in multiple jurisdictions and most frequently across continents, whether North or South America, Europe, Asia or Africa.
Tom has been recognized for Corporate/M&A and Private Equity Transactions in a number of leading legal publications, including IFLR 1000, The Legal 500 UK, Chambers Europe, Chambers Global and Chambers UK.
Most recently, Tom was recognized in Chambers UK 2025 as an Eminent Practitioner for Corporate/M&A, sources note “Tom is a very experienced and calm presence who is very focused on practical solutions and making sure the deal doesn't get sidetracked.” He is recognized in Chambers Europe 2024 for Corporate/M&A : High-end Capability, where sources note “Thomas is a strong team leader,” and “Thomas always adds meaningful insight and high value to the matters he represents us on.” Tom was ranked in Chambers UK 2024 for Corporate/M&A: £100-800 million - London (Firms), with sources commenting “Thomas Thesing is exceptionally experienced, wise, and commercially supportive.” In the 2023 edition of Chambers UK, clients stated that “Thomas is extremely helpful on strategic as well as purely legal matters. Sophisticated and worldly, and provided excellent support.” In the 2021 edition, clients commented “his subject matter expertise and holistic understanding of transactions is fantastic.”
In addition, the London Private Equity practice was honored as “Private Equity Team of the Year” in the 2021 Legal Business Awards.
*Only admitted to practice in Illinois. Not admitted to practice in England and Wales.