Paul Sieben


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Paul Sieben, Head of O’Melveny’s Silicon Valley office, represents all stages of technology companies as well as numerous venture capital firms and investment banks. Paul’s practice is focused on corporate and securities law and has extensive experience with transactions in which he represents companies and investors in venture capital financings, mergers and acquisitions, early liquidity transactions, spin-offs and buyouts, recapitalizations, public equity offerings and private debt transactions.  Paul has served as lead counsel on hundreds of venture capital, angel and private-equity financings, more than a hundred M&A transactions of all sizes, and a significant number of recapitalizations, public offerings and other transactions — many on behalf of, or opposite, major tech companies.

Much of Paul’s practice stems from his startup company practice, where he handles formation, founder-related matters, seed investments and venture capital financings for early-stage companies and then continues to represent them in various matters including later stage financings, M&A and corporate governance matters as they grow into larger private and public companies.


Honors & Awards

  • International Financial Law Review 1000, Leading Lawyers for Private Equity
  • Legal 500 US, Recommended in Venture Capital and Emerging Companies Category
  • Legal 500 US, Recommended in M&A - Middle-Market Category
  • Super Lawyers’ “Rising Stars” Northern California, Mergers & Acquisitions


Bar Admissions

  • California


  • University of California, Los Angeles, J.D., 1998: Order of the Coif; Corpus Juris Secundum Awards in Tort Law and Civil Procedure
  • University of California, Santa Barbara, B.A., 1995:  High Honors; Dean’s List

Professional Activities


  • California Bar Association


  • Emerging Manager Venture Summit, “Managing Partial Liquidity –  A Map through the Minefield”
  • Silicon Valley Association of General Counsel (SVAGC): “Trends in Technology Mergers & Acquisitions”
  • Dow Jones VentureWire Technology Showcase, “Finding an Exit”; VentureBeat, “Downturn Roundtable”
  • Entrepreneurs Forum, North America Chinese Semiconductor Association (NACSA)
  • Formation, financing, and ultimate $260 million sale of cybersecurity company
  • $800 million financing and related tender offer of private social media company
  • $200 million financing of a leading mobile payments company
  • $200 million sale of advanced authentication company
  • Formation, financing and ultimate sales of multiple social media, e-commerce and enterprise software companies to the world’s largest public and private Internet and software companies