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, other investors and market participants. Paul’s practice is focused on M&A, venture capital, private equity, early liquidity transactions, spin-offs, recapitalizations, public equity offerings and private debt transactions.  Paul has served as lead counsel on more than 1,000 venture capital, angel and private-equity financings, more than 200 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, venture capital and private equity firms.

Paul’s practice stems from his relationships with a combination of early and late stage venture capital firms, large public technology companies and 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

  • Recognized by Best Lawyers® for Mergers and Acquisitions Law in Menlo Park, CA (2023-2024)
  • 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


  • Finding Genius Fall Venture Capital Forum
  • JLABS Legal Webinar Series for Life Sciences Entrepreneurs, “Raising Capital: A Legal Primer”
  • 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)
  • $800 million financing and related tender offer of private social media company
  • Over $1.0 billion spinout and sale of mobile gaming company
  • $200 million financing of a leading mobile payments company
  • $200 million acquisition of advanced authentication company
  • Scores of private company tender offer and other “early liquidity” transactions on behalf of both investors and large private technology companies
  • Formation, financing and ultimate sales of multiple social media, cyber-security, e-commerce and enterprise software companies to the world’s largest public and private Internet and software companies

Press Releases

One Hundred O’Melveny Lawyers Recognized by Best Lawyers in America ® 2024

8月 17, 2023

O’Melveny Advises Hammerspace on US$56.7 Million First Institutional Funding

7月 20, 2023

O’Melveny Advises Fielmann Group on Acquisition of SVS Vision

6月 12, 2023

O’Melveny Advises Splashtop on Acquisition of Foxpass

3月 23, 2023

O’Melveny Advises Acceldata in US$50 Million Series C Funding

2月 9, 2023

O’Melveny Advises Alation in US$123 Million Series E Funding

11月 3, 2022

O’Melveny Advises Cepton on US$100 Million Investment from Koito Manufacturing

10月 27, 2022

O’Melveny Represents Halo.Car on US$5 Million Seed Financing

10月 7, 2022

Eighty Five O’Melveny Lawyers Recognized by Best Lawyers in America ® 2023

8月 24, 2022

O’Melveny Advises Ordr in US$40 Million Series C Funding

6月 3, 2022

O’Melveny Advises AutoGrid Systems in Acquisition by Schneider Electric

5月 12, 2022

O’Melveny Advises Analog Bits on Acquisition by SEMIFIVE

3月 24, 2022

O’Melveny Advises Ripple Health Group in Acquisition by Calm

2月 3, 2022

O’Melveny Advises Zum in US$130 Million Series D Funding

10月 7, 2021

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