Steffen Hemmerich is a partner in the New York office of Mayer Brown and a member of the Financial Services Regulatory & Enforcement and Broker-Dealer Regulation & Compliance practices. He provides broker-dealer regulatory and transactional advice to domestic and foreign investment banks, financial institutions, investment advisers, hedge funds and private equity funds.

Steffen regularly counsels clients on federal and state broker-dealer regulatory matters and applicable self-regulatory organization (“SRO”) matters; US Securities and Exchange Commission (“SEC”) financial responsibility rules, including SEC Rule 15c3-3 and custody issues arising thereunder; custody arrangements with domestic and foreign custodians, including the negotiation of custody agreements; broker-dealer registration/formation, including structural advice, and SRO membership (FINRA, exchanges and clearing agencies); successor registration; material changes in business operations/business expansions; merger/acquisition/restructuring transactions; business transfers/consolidations; registration and qualification of personnel (state/SRO); foreign broker-dealer/cross-border issues under SEC Rule 15a-6 and “chaperoning” arrangements thereunder; books and records requirements; regulatory reporting and disclosure obligations; vendor/outsourcing relationships; compliance and operational systems/technologies; product development; FINRA advertising issues; SEC risk assessment requirements (Form 17-H filings); and Bank Secrecy Act/Anti-Money Laundering and Office of Foreign Assets Control compliance.

Steffen also advises financial services firms and fintech companies on securities and broker-dealer regulatory matters relating to digital assets and blockchain technology, including business expansion and broker-dealer registration and custody issues.


Benjamin N. Cardozo School of Law, LLM

Goethe-University Frankfurt am Main, Germany, JD


  • Germany
  • New York


  • Member, American Bar Association, Section of Business Law
  • Member, New York City Bar Association
  • Member, American Council on Germany