LAWYER PROFILE
Heidi Mayon

Heidi Mayon

Global 2026

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Ranked in 1 practice area

About

Provided by Simpson Thacher & Bartlett LLP

Practice Areas

Heidi Mayon's practice focuses on all areas of corporate and securities law, with an emphasis on capital markets transactions. Ms. Mayon represents a full range of corporate clients on a wide variety of matters, including public company readiness, initial public offerings, complex capital markets transactions, corporate governance and advising boards of directors. She works with clients across a broad range of industries, including artificial intelligence, e-commerce, consumer goods, biotechnology, software, retail, telecommunications, hardware, and energy and clean technology. Heidi has been named “Dealmaker of the Year” by The American Lawyer, to Lawdragon’s “500 Leading Dealmakers in America,” to The Daily Journal’s “Top Women Lawyers” and “Top California Lawyers” and a “Silicon Valley Women of Influence” by the Silicon Valley Business Journal.

Heidi has represented issuers and underwriters in well over 150 offerings of equity and debt including the IPOs for DoorDash, Poshmark, Doximity, Astera Labs, Vera Therapeutics, ARMO Biosciences, Anaplan, Despegar, Renewable Energy Group, Arcus Biosciences, Cardlytics, Cloudera, Veracyte, SunPower, Violin Memory, Sonim Technologies, Skywater Technologies, Atheros Communications, Genomic Health and Financial Engines.

Career

Joined Firm, 2022.

Personal

B.A., University of San Diego, 1999; J.D., University of San Francisco School of Law, 2002.

Chambers Review

Provided by Chambers

Chambers Global Guide

Capital Markets: Debt & Equity: Western United States - USA

Band 3
Band 3

Individual Editorial
Heidi Mayon boasts notable experience of handling significant IPOs. Her clients stem from a broad range of industries including the technology and energy sectors.

Strengths

Provided by Chambers

  • Heidi is really pragmatic and collaborative.

    Capital Markets: Debt & Equity: Western United StatesChambers Global Guide

Ranked Individuals at Simpson Thacher & Bartlett LLP (111)

Belgium

Brazil

  • Profile image of Grenfel S Calheiros
    Grenfel S Calheiros

    Capital Markets (International Firms)

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  • Profile image of Paulo Fernando de Menezes Cardoso
    Paulo Fernando de Menezes Cardoso

    Capital Markets (International Firms)

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  • Profile image of Grenfel S Calheiros
    Grenfel S Calheiros

    Corporate/M&A (International Firms)

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  • Profile image of Paulo Fernando de Menezes Cardoso
    Paulo Fernando de Menezes Cardoso

    Corporate/M&A (International Firms)

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China

  • Profile image of Makiko Harunari
    Makiko Harunari

    Banking & Finance: Leveraged & Acquisition Finance (International Firms)

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  • Profile image of Anuj Shah
    Anuj Shah

    Banking & Finance: Leveraged & Acquisition Finance (International Firms)

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  • Profile image of Christopher Wong
    Christopher Wong

    Capital Markets: Equity (International Firms)

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  • Profile image of Ian Ho
    Ian Ho

    Corporate/M&A: Hong Kong-based (International Firms)

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  • Profile image of Yang Wang
    Yang Wang

    Corporate/M&A: Mainland China-based (International Firms)

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  • Profile image of Ian Ho
    Ian Ho

    Private Equity: Buyouts & Venture Capital Investment (International Firms)

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  • Profile image of Yang Wang
    Yang Wang

    Private Equity: Buyouts & Venture Capital Investment (International Firms)

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Japan

Latin America - International Counsel

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