USA Guide 2026 : USA - Nationwide
Ranked Individuals
Provided by Simpson Thacher & Bartlett LLP
Simpson Thacher’s Government and Internal Investigations Practice advises financial institutions, asset managers, multinational companies, boards and audit committees, senior executives and other professionals in high-stakes investigations and enforcement matters brought by the DOJ, U.S. Attorneys’ Offices, the SEC, the CFTC, the CFPB, state attorneys general, district attorneys, the Federal Reserve Bank, FINRA, Congressional committees and regulators throughout the world. Our team is frequently engaged in matters involving parallel criminal, civil, congressional and regulatory exposure, cross-border investigations, novel enforcement theories and issues carrying significant reputational and business risks. We offer a deep bench of talent, which includes former senior government officials from the SEC, DOJ and FTC; former U.S. federal prosecutors; senior state attorneys general and Congressional investigators; and nationally recognized litigators. We also have extensive experience in investigations relating to the offering and trading of crypto and other digital assets. For the eleventh year in a row, the Firm was recently recognized by Global Investigations Review in the GIR 100. In addition, our practice and lawyers are consistently recognized by The Legal 500, Benchmark Litigation, The American Lawyer, Law360, and The National Law Journal, among others.
Provided by Chambers
Simpson Thacher & Bartlett LLP is a highly rated team that comprises a number of very prominent practitioners with impressive government experience. It demonstrates extensive strength in SEC investigations and enforcement proceedings. The firm acts for major financial institutions, asset managers, and big-name corporations in matters related to disclosure, accounting practices and whistle-blowers.
Provided by Chambers
Simpson Thacher & Bartlett LLP represented Blackstone subsidiaries in an SEC settlement relating to investigations into texting practices.
Provided by Chambers
Simpson provides strategic advice woven together with their SEC knowledge. They are wonderful and super skilled.
Simpson has incredible depth and skill in the investigations space.
The level of knowledge, empathy, willingness to collaborate and setting realistic expectations stood out. Simpson provided a high level of confidence and anticipated each step by the SEC.
Simpson are highly skilled, practical and consistently make time for us. This team has excellent technical knowledge and quickly grasps issues and issue-spots for us. They have wide-ranging expertise producing high quality of work at all levels.
The Simpson team are familiar with complex sectors and never delay a response or their attention.
Provided by Chambers
Mike is the person to call for tricky issues. His excellent mastery of complex products makes him unique.
Mike is a great communicator with skill and gravitas. He is incredible with witnesses.
Mike is an excellent technical lawyer with great expertise in navigating regulatory exams and similar matters.
Adam Aderton attracts high praise for his deep expertise in the asset management industry. He counsels clients facing securities regulation issues relating to registration, pay-to-play, marketing and disclosure.
Adam has true depth of expertise.
Adam has terrific experience concentrated in the asset management space.
Adam is one of the most proactive counsel. His white glove service is incredible and appreciated. He provides commercial advice on discreet issues.
Adam understood the challenges and laid the ground work for a positive outcome. He was straightforward, truthful and showed empathy.
Adam is incredibly smart and he knows the answers that other people don't.
Securities: Regulation: Enforcement
Securities: Regulation: Enforcement
Provided by Simpson Thacher & Bartlett LLP
Adam Aderton
View profile of Adam AdertonMichael Osnato
View profile of Michael Osnato
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