About Koji

Koji focuses on complex commercial litigation, including the defense of securities class actions, derivative suits, M&A-related class actions and government investigations. He also regularly conducts internal investigations for boards, as well as their audit or special litigation committees. Chambers USA has noted Koji as “practical, business-savvy and strategic,” with “great advocacy skills” and a “wonderful leadership presence.” Koji is a former member of Cooley’s board of directors and a past chair of the firm’s securities litigation practice. He also is a past chair of the American Bar Association’s Litigation Section and an immediate-past member of the ABA’s Board of Governors, along with its Audit and Finance Committee and the Standing Committee on Audit.

Passions

Family

Surfing

Golf

As an active litigator and public speaker, I stay on top of the legal, business and regulatory trends in order to counsel and defend my clients effectively.

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Experience

    Defended 60+ Securities Class or Representative Actions

    January 1, 2021

    Defended 60+ securities class or representative actions for clients such as Qualcomm, GNC Holdings, Stratasys, Horizon Pharma, Sientra, Gemstar-TV Guide, Charlotte-Russe Holdings and Brocade.

    Related contacts

    Koji Fukumura
    Partner, San Diego

    Related Practices & Industries

    Defended 40+ M&A Transactions

    December 31, 2020

    Defended 40+ M&A transactions for clients such as Micromet, Websense, Volcano, Genoptix, Auspex Pharmaceuticals, DivX and Thermo Fisher Scientific.

    Related contacts

    Koji Fukumura
    Partner, San Diego

    Related Practices & Industries

    Defended 75+ SEC and SRO Investigations or Inquiries

    December 31, 2020

    Defended 75+ SEC and SRO investigations or inquiries for clients in a wide range of industries, such as pharmaceutical, life sciences, semiconductor, software, storage and retail.

    Related contacts

    Koji Fukumura
    Partner, San Diego

    Related Practices & Industries

    Activision Blizzard Securities Suit Dismissed

    April 10, 2020

    Cooley successfully defended Activision Blizzard and certain officers in a securities class action filed in the Central District of California alleging the company made false and misleading statements regarding the termination of its partnership with Bungie LLC and its future involvement with the Destiny video game franchise. The court ultimately granted our motion to dismiss and the plaintiff did not appeal the trial court’s ruling.

    Related contacts

    Koji Fukumura
    Partner, San Diego
    Ryan Blair
    Partner, San Diego
    Erin Trenda
    Partner, San Diego
    Craig TenBroeck
    Partner, San Diego
    Heather Speers
    Partner, San Diego
    Cynthia Deatrick
    Paralegal Specialist, San Diego

    Related Practices & Industries

    Complete Victory for Qualcomm

    July 24, 2019

    Cooley obtained a victory for Qualcomm and its executives in a securities class action filed in the Southern District of California. The plaintiffs, relying heavily on “confidential witnesses,” alleged the company misled investors by failing to disclose overheating problems with a high-end chipset and the impending loss of a large customer. Piercing through these allegations, the court granted our motion to dismiss with leave to amend after oral argument. Plaintiffs filed a second amended complaint and we filed and argued another motion to dismiss. The court ultimately granted our second motion to dismiss with prejudice, and the ruling was affirmed on appeal.

    Related contacts

    Koji Fukumura
    Partner, San Diego
    Peter Adams
    Partner, San Diego
    Steve Strauss
    Senior Counsel, San Diego
    Craig TenBroeck
    Partner, San Diego
    Jeanne Detch
    Associate, San Diego

    Related Practices & Industries

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Admissions and credentials

  • California
  • Colorado
  • Pennsylvania

Rankings and accolades

Forbes: America’s Top 250 Lawyers (2025)

Chambers USA: Securities Litigation – California – Band 1 (2016 – 2025)

The Legal 500 US: Leading Lawyer in Securities Litigation – Defense (2016 – 2025)

Best Lawyers in America:Lawyer of the Year for Litigation – Mergers and Acquisitions – San Diego (2024)

Best Lawyers in America: Lawyer of the Year for Bet-the-Company Litigation – San Diego (2023)

Best Lawyers in America: Lawyer of the Year for Securities Litigation – San Diego (2013, 2019 and 2024)

Best Lawyers in America: Lawyer of the Year for Litigation – Mergers and Acquisitions – San Diego (2012 – 2014, 2018, 2019, 2021 and 2023)

Best Lawyers in America: Leading Lawyer for Commercial Litigation (2009 – 2024); Securities Litigation (2009 – 2024); Litigation – Mergers and Acquisitions (2012 – 2024); Litigation –Regulatory Enforcement (2012 – 2024); Mass Tort Litigation/Class Actions (2020 – 2024); and Bet-the-Company Litigation (2023 – 2024)

Benchmark Litigation: California Litigation Star (2010 – 2024); National Litigation Star (2024)

Benchmark Litigation: San Diego Lawyer of the Year (2019 – 2022)

Southern California Super Lawyers: Top 10 Lawyers in San Diego (2016, 2020 – 2024)

Southern California Super Lawyers: Top 50 Lawyers in San Diego (2009 – 2013, 2015 – 2024)

Southern California Super Lawyers: Leading Lawyer for Securities Litigation (2007 – 2024)

Memberships and affiliations

  • American Bar Association (ABA)
  • American Bar Foundation
  • American Business Trial Lawyers Association
  • American Inns of Court
  • Federal Bar Association
  • Japanese American National Museum
  • National Asian Pacific American Bar Association
  • U.S.-Japan Council
  • Pan Asian Lawyers of San Diego
  • San Diego County Bar Association
  • Southwest Center for Asian Pacific American Law
  • Lawyers Committee for Civil Rights Under Law

An in-depth understanding of the legal issues and a practical approach to resolving matters.

Chambers USA

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