O’Melveny Worldwide

Rob Plesnarski represents public and private companies, investment banks, private equity funds, hedge funds and other market participants in a full range of regulatory and transactional securities law matters.

Rob provides securities law regulatory advice to issuers, underwriters and institutional investors in US and international public and private offerings of equity, debt and derivative securities, with a particular focus on transactions involving equity derivatives or restricted or control securities. Rob also counsels Fortune 100 corporations, small public companies, investment funds and other clients in connection with federal and state securities law topics, including SEC disclosure best practices, corporate governance, beneficial ownership reporting under Sections 13 and 16 of the Exchange Act, SEC rules related to federal proxy matters, mergers and acquisitions and tender offers, and SEC enforcement matters. Rob regularly provides securities law advice with respect to the Securities Act of 1933, the Securities Exchange Act of 1934, the Trust Indenture Act of 1939, the Investment Company Act of 1940, the Investment Advisors Act of 1940, the Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act, and the JOBS Act.

Rob is consistently selected for inclusion as a top lawyer in Chambers USA, with Chambers noting that Rob “came highly recommended by sources, with several stressing his strength of substantive knowledge and his excellent rapport with clients” and that "on extremely complex issues, he's been phenomenal."

Prior to joining O’Melveny, Rob served as Deputy Chief Counsel for the SEC’s Division of Corporation Finance. Before joining the SEC, Rob practiced corporate and securities law at Arent Fox PLLC in Washington, DC.

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Bar Admissions

  • District of Columbia
  • Pennsylvania


  • Temple University, J.D., 1991: cum laude; Temple Law Foundation Scholarship 
  • Dartmouth College, B.A., 1987: magna cum laude

Honors & Awards

  • Recognized by Best Lawyers® for Securities / Capital Markets Law in Washington, DC (2024)
  • Recognized by Business Today as Top 10 Trailblazing Securities: Regulation: Advisory Lawyers of 2023 in USA
  • Top Ranked Securities Regulation: Nationwide, Chambers USA 
  • SEC Capital Markets Award

Professional Activities

Board of Advisors

  • TheCorporateCounsel.net

Corporate & Government Experience

  • Deputy Chief Counsel, United States Securities & Exchange Commission