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Heidi Mayon
 

Heidi Mayon

Partner
 
2475 Hanover Street
Palo Alto, CA 94304 

Heidi Mayon is a Partner in Simpson Thacher’s Palo Alto office and a member of the Capital Markets Practice. She focuses on advising companies, investors and underwriters on a wide range of securities matters, including initial public offerings (IPOs), venture financings, growth equity, follow-on equity, block trades, bought deals, ATM programs, committed lines of equity, spin-offs and transactions by special purpose acquisition companies (SPACs). She has extensive experience across numerous industries including technology, healthcare and life sciences, FinTech and payments, marketplaces and retail, energy and clean technology. Heidi also regularly advises public and private companies on reporting obligations, corporate governance and other general corporate matters.

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Work Highlights

Experience prior to joining Simpson Thacher includes:

Initial Public Offerings (IPOs)

DoorDash, Poshmark, Doximity, Skywater Technologies, Vera Therapeutics, Sonim Technologies, ARMO Biosciences, Despegar, Renewable Energy Group, Arcus Biosciences, Cardlytics, Cloudera, Veracyte, SunPower, Violin Memory, Sonim Technologies, Skywater Technologies, Atheros Communications, Genomic Health and Financial Engines.

Other Complex Securities Transactions

Additional equity and debt offerings representing issuer and underwriters, including in transactions for Penumbra, Axon Enterprises, Natera, Cloudera, Theravance Biopharma, Coldwater Creek, Clearwater Paper, Renewable Energy Group and Evolus.

SPACs

Representation of companies in de-SPAC transactions, including Better Therapeutics, Cano Health and Open Lending. Representation of issuers and sponsors in SPAC IPOs, including Qell Acquisition Corp., Prime Impact and PTK.

Accolades
  • The American Lawyer “Dealmaker of the Year”, 2021
  • Silicon Valley Business Journal “Woman of Influence in Silicon Valley”, 2021
  • Daily Journal “Top 100 Lawyers in California”, 2021
  • Daily Journal “Top 100 Women Lawyers in California”, 2021
Education
  • University of San Francisco, 2002 J.D.
  • University of San Diego, 1999 B.A. Political Science
Admissions
  • California 
Languages Spoken
  • English

Heidi Mayon is a Partner in Simpson Thacher’s Palo Alto office and a member of the Capital Markets Practice. She focuses on advising companies, investors and underwriters on a wide range of securities matters, including initial public offerings (IPOs), venture financings, growth equity, follow-on equity, block trades, bought deals, ATM programs, committed lines of equity, spin-offs and transactions by special purpose acquisition companies (SPACs). She has extensive experience across numerous industries including technology, healthcare and life sciences, FinTech and payments, marketplaces and retail, energy and clean technology. Heidi also regularly advises public and private companies on reporting obligations, corporate governance and other general corporate matters.

Select experience prior to joining Simpson Thacher includes:

Initial Public Offerings (IPOs)

DoorDash, Poshmark, Doximity, Skywater Technologies, Vera Therapeutics, Sonim Technologies, ARMO Biosciences, Despegar, Renewable Energy Group, Arcus Biosciences, Cardlytics, Cloudera, Veracyte, SunPower, Violin Memory, Sonim Technologies, Skywater Technologies, Atheros Communications, Genomic Health and Financial Engines.

Other Complex Securities Transactions

Additional equity and debt offerings representing issuer and underwriters, including in transactions for Penumbra, Axon Enterprises, Natera, Cloudera, Theravance Biopharma, Coldwater Creek, Clearwater Paper, Renewable Energy Group and Evolus.

SPACs

Representation of companies in de-SPAC transactions, including Better Therapeutics, Cano Health and Open Lending. Representation of issuers and sponsors in SPAC IPOs, including Qell Acquisition Corp., Prime Impact and PTK.

Heidi was recognized as a 2021 “Dealmaker of the Year” by The American Lawyer. She has also been recognized as a “Top Lawyer in California” and “Top Women Lawyer in California” by the Daily Journal and a “Silicon Valley Women of Influence” by the  Silicon Valley Business Journal .

Heidi received her J.D. from University of San Francisco School of Law in 2002 and her B.A. from University of San Diego in 1999.

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