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Simpson Thacher Adds Leading Asset Management Litigation Partner

03.26.25

Simpson Thacher & Bartlett LLP today announced that Adam Aderton has joined the Firm’s Washington, D.C. office as a Partner in its Government and Internal Investigations Practice and as a member of the Litigation Department.

Adam focuses on regulatory and enforcement matters, with extensive experience advising clients across the asset management industry. He advises on complex regulatory inquiries and litigation matters involving private equity funds, venture capital funds, hedge funds, business development companies, mutual funds and ETFs, as well as separately managed accounts. He also provides asset managers with ongoing compliance advice.

“Adam’s invaluable experience as both a senior SEC official and in private practice gives him incredible insight into the enforcement landscape. We’re thrilled to have him join our global investigations team,” said Nick Goldin and Jeff Knox, the Co-Heads of the Firm’s Global Government and Internal Investigations Practice. “Adam’s onboarding reflects Simpson Thacher’s continued investment in our investigations, enforcement and regulatory practice and builds on the recent addition of partners Zach Hafer, Anne Choe, Justin Browder and Neesa Sood,” Nick and Jeff added.

“Adam is one of the most highly regarded regulatory and enforcement lawyers, and he will be a tremendous asset to clients across the asset management industry,” said Michael Osnato, Head of Simpson Thacher’s Funds Regulatory and Investigations Practice.

Adam spent more than 14 years at the SEC’s Division of Enforcement, including serving from 2019-2022 as the Co-Chief of the Enforcement Asset Management Unit. In that role, he directed the SEC’s investigative teams responsible for investigations and enforcement matters for asset managers across the country. Adam also led Enforcement’s coordination with the Division of Examinations and advised on significant rulemakings involving the asset management industry. Recently named among Securities Docket’s “Enforcement Elite,” Adam joins the Firm from Willkie Farr & Gallagher LLP, where he was Co-Chair of the Securities Enforcement Practice.

Lynn Neuner and Jon Youngwood, Co-Chairs of the Litigation Department, added, “Our litigation and investigations practice is seeing increased demand from clients across the asset management sector, and Adam is an excellent addition to our substantial bench of former senior government officials, federal prosecutors and seasoned trial lawyers.”

“The Firm’s multidisciplinary asset management platform is well-known as being at the vanguard of the industry. I am excited to join this incredibly talented team in advising clients on their most pressing regulatory, investigations and enforcement matters,” said Adam.

Simpson Thacher’s premier global Litigation Department represents a wide range of sophisticated clients, including financial institutions, technology and life sciences corporations, boards, audit and special committees, and senior executives on their most significant matters. The Firm’s global Government and Internal Investigations Practice is consistently recognized as an industry leader by Global Investigations Review, Chambers, The Legal 500 and Benchmark Litigation and others for its guidance to clients navigating their most sensitive matters across industries, sectors and geographies. Complementing this work, the Firm’s Funds Regulatory and Investigation Practice provides sponsor and adviser clients with practical and creative solutions to complex regulatory, compliance and enforcement issues, including on SEC exams, inquiries and investigations, and other enforcement proceedings. Supported by a bench that includes several former federal prosecutors and senior government officials from the SEC and DOJ, the investigations team has extensive experience advising on emerging compliance and regulatory considerations.

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