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Litigation

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  • A Comprehensive and Accomplished Litigation Practice

    With more than 250 litigators across the firm, Wilson Sonsini represents technology and life sciences companies confronting challenging claims and conflicts—from class actions and commercial disputes to IP and trade secret matters.

  • Our Experienced Litigation Team Represents Clients Through All Stages, Including Trial and Appellate Proceedings

    In addition to accomplished trial attorneys who represent entities before juries and judges, Wilson Sonsini has teams of experienced litigators who excel at representing clients in the early stages of disputes and throughout pre-trial proceedings. The firm also has proven, experienced appellate counsel.

  • Wilson Sonsini Earns "Appellate Hot List" Recognition

    Wilson Sonsini was named an “Appellate Hot List” finalist as part of The National Law Journal’s 2025 Legal Awards, which highlights the top litigation and appellate work from the previous year. Wilson Sonsini has secured landmark decisions in disputes involving social media, online advertising, copyright law, the First Amendment, and privacy issues.

Wilson Sonsini is one of only a few firms that can say, without qualification, it represents the most sophisticated and progressive companies in the world in litigation, regulatory, and transactional matters.

Wilson Sonsini represents clients that achieve success by innovating, venturing beyond boundaries, or disrupting established industries. As a result, the disputes and contentious matters Wilson Sonsini takes on for its clients involve formative and complex technologies, novel issues of law, and substantial amounts in controversy.

Wilson Sonsini has more than 250 litigators across the firm, and continues to expand. The firm represents public companies, private entities, and other organizations in venues across the U.S.: federal and state trial courts; appellate courts; regulatory agencies; and administrative tribunals, including the Patent Trial and Appeal Board.

In addition to accomplished trial attorneys who represent entities before juries and judges, Wilson Sonsini has teams of experienced litigators who excel at representing clients in the early stages of disputes and throughout pre-trial proceedings. The firm also has proven, experienced appellate counsel.

The depth and dimension of Wilson Sonsini’s litigation practice enables the firm to represent clients in disputes that range from bet-the-company claims asserted by competitors to class actions involving multiple parties and multiple states. Our expansive scope of litigation experience covers areas of critical importance to clients, including intellectual property, securities, and complex commercial lawsuits, as well as government investigations and corporate governance matters.

Wilson Sonsini delivers results for its clients, which is just one reason the firm’s litigation department has a well-earned reputation for excellence among its clients, peers, and colleagues.

Overview

Wilson Sonsini is one of only a few firms that can say, without qualification, it represents the most sophisticated and progressive companies in the world in litigation, regulatory, and transactional matters.

Wilson Sonsini represents clients that achieve success by innovating, venturing beyond boundaries, or disrupting established industries. As a result, the disputes and contentious matters Wilson Sonsini takes on for its clients involve formative and complex technologies, novel issues of law, and substantial amounts in controversy.

Wilson Sonsini has more than 250 litigators across the firm, and continues to expand. The firm represents public companies, private entities, and other organizations in venues across the U.S.: federal and state trial courts; appellate courts; regulatory agencies; and administrative tribunals, including the Patent Trial and Appeal Board.

In addition to accomplished trial attorneys who represent entities before juries and judges, Wilson Sonsini has teams of experienced litigators who excel at representing clients in the early stages of disputes and throughout pre-trial proceedings. The firm also has proven, experienced appellate counsel.

The depth and dimension of Wilson Sonsini’s litigation practice enables the firm to represent clients in disputes that range from bet-the-company claims asserted by competitors to class actions involving multiple parties and multiple states. Our expansive scope of litigation experience covers areas of critical importance to clients, including intellectual property, securities, and complex commercial lawsuits, as well as government investigations and corporate governance matters.

Wilson Sonsini delivers results for its clients, which is just one reason the firm’s litigation department has a well-earned reputation for excellence among its clients, peers, and colleagues.

Alerts
Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
Alerts
California Attorney General Targets MSO-PC Structures: What the Art Center Holdings Amicus Brief Means for CPOM Compliance
Executive Summary
Alerts
PTAB Again Rules in Favor of Broad in CRISPR-Cas9 Patent Dispute
Key Points
Alerts
Washington State’s Expansive New Non-Compete Ban
On March 23, 2026, Washington State Governor Bob Ferguson signed into law Engrossed Substitute House Bill 1155 (HB 1155), which effectively bans non-compete agreements for all employees and independent contractors in the state. Previously, in 2019 and 2024, Washington prohibited non-compete agreements for lower wage earners and included other requirements for such restrictions.
Client Highlights
Court Denies Plaintiffs Leave to Amend in Replacement Tires Antitrust MDL, Dismissing Alleged Price-Fixing Cases with Prejudice
A Wilson Sonsini team recently obtained a full dismissal with prejudice on behalf of Continental Aktiengesellschaft and Continental Tire the Americas, LLC of alleged price-fixing claims on replacement tires. 
News Articles
Colleen Bal Honored Among Daily Journal’s 2026 Leading Commercial Litigators
On April 1, 2026, litigation partner Colleen Bal was featured in Daily Journal’s special supplement of "Leading Commercial Litigators 2026." The accompanying profile highlights Colleen’s track record of jury trial victories at Wilson Sonsini, spotlighting her recent trial win for Google and victory for Guardian Innovative Solutions (GIS).
View All
Insights
Alerts
Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
Alerts
California Attorney General Targets MSO-PC Structures: What the Art Center Holdings Amicus Brief Means for CPOM Compliance
Executive Summary
Alerts
PTAB Again Rules in Favor of Broad in CRISPR-Cas9 Patent Dispute
Key Points
Alerts
Washington State’s Expansive New Non-Compete Ban
On March 23, 2026, Washington State Governor Bob Ferguson signed into law Engrossed Substitute House Bill 1155 (HB 1155), which effectively bans non-compete agreements for all employees and independent contractors in the state. Previously, in 2019 and 2024, Washington prohibited non-compete agreements for lower wage earners and included other requirements for such restrictions.
Client Highlights
Court Denies Plaintiffs Leave to Amend in Replacement Tires Antitrust MDL, Dismissing Alleged Price-Fixing Cases with Prejudice
A Wilson Sonsini team recently obtained a full dismissal with prejudice on behalf of Continental Aktiengesellschaft and Continental Tire the Americas, LLC of alleged price-fixing claims on replacement tires. 
News Articles
Colleen Bal Honored Among Daily Journal’s 2026 Leading Commercial Litigators
On April 1, 2026, litigation partner Colleen Bal was featured in Daily Journal’s special supplement of "Leading Commercial Litigators 2026." The accompanying profile highlights Colleen’s track record of jury trial victories at Wilson Sonsini, spotlighting her recent trial win for Google and victory for Guardian Innovative Solutions (GIS).
View All
WSGR Events
Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
Affiliated Programs
IPBC Global 2026
Wilson Sonsini is proud to sponsor the IPBC Global 2026 on June 15-17, 2026, at the InterContinental San Diego. Partner Michael Levin will serve as the moderator for this panel, "IP: The Voice of Value" on Wednesday, June 17 at 10:10 a.m.-11:10 a.m. and will be joined by leaders from Burford Capital, Qualcomm Technology Licensing, Dolby Laboratories, BASF and Sisvel International SA.
Affiliated Programs
The L Suite 2026 Legal AI Conference
Wilson Sonsini is proud to be the Ecosystem Partner of The L Suite 2026 Legal AI Conference. Based on this year’s theme—General Counsel in the Age of AI: Frameworks, Risk, and the Future of Legal Leadership—panel discussions will cover pressing topics, including increasing regulatory scrutiny, redefinition of corporate value, and agentic workforce.
WSGR Events
State Attorneys General Series: Current Litigation and Enforcement Risks
Wilson Sonsini's State Attorneys General (AG) webinar series offers a unique opportunity to hear directly from current and former state AG leaders who have led high-profile investigations and state enforcement challenges, and gain insights that can help you safeguard your company's reputation and navigate regulatory scrutiny.
Affiliated Programs
Securities Enforcement Forum West 2026
Wilson Sonsini is proud to sponsor Securities Enforcement Forum West on May 21, 2026, at the Palace Hotel in San Francisco, with an option for attendees to view the event live online. This one-day conference brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel, compliance executives, and other top professionals in the field to discuss the most pressing topics in securities enforcement. Key discussion points will include financial and accounting fraud, the impact of artificial intelligence (AI), advanced litigation and investigation strategies, managing SEC-related criminal matters, cryptocurrency, whistleblowers, insider trading, cybersecurity, and much more.
WSGR Events
Building Patent Portfolio Value and Strategic Licensing Trends for In-House Counsel
Patent portfolios are under increasing pressure to do more than protect innovation. In today’s market, in-house legal teams are being asked to manage costs, support business growth, and think more strategically about how patent assets can create long-term value. That includes making smart decisions about portfolio development and pruning, while also understanding how licensing structures, acquisitions, and patent pools can help advance business goals and reduce risk. 
View All
Events
WSGR Events
Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
Affiliated Programs
IPBC Global 2026
Wilson Sonsini is proud to sponsor the IPBC Global 2026 on June 15-17, 2026, at the InterContinental San Diego. Partner Michael Levin will serve as the moderator for this panel, "IP: The Voice of Value" on Wednesday, June 17 at 10:10 a.m.-11:10 a.m. and will be joined by leaders from Burford Capital, Qualcomm Technology Licensing, Dolby Laboratories, BASF and Sisvel International SA.
Affiliated Programs
The L Suite 2026 Legal AI Conference
Wilson Sonsini is proud to be the Ecosystem Partner of The L Suite 2026 Legal AI Conference. Based on this year’s theme—General Counsel in the Age of AI: Frameworks, Risk, and the Future of Legal Leadership—panel discussions will cover pressing topics, including increasing regulatory scrutiny, redefinition of corporate value, and agentic workforce.
WSGR Events
State Attorneys General Series: Current Litigation and Enforcement Risks
Wilson Sonsini's State Attorneys General (AG) webinar series offers a unique opportunity to hear directly from current and former state AG leaders who have led high-profile investigations and state enforcement challenges, and gain insights that can help you safeguard your company's reputation and navigate regulatory scrutiny.
Affiliated Programs
Securities Enforcement Forum West 2026
Wilson Sonsini is proud to sponsor Securities Enforcement Forum West on May 21, 2026, at the Palace Hotel in San Francisco, with an option for attendees to view the event live online. This one-day conference brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel, compliance executives, and other top professionals in the field to discuss the most pressing topics in securities enforcement. Key discussion points will include financial and accounting fraud, the impact of artificial intelligence (AI), advanced litigation and investigation strategies, managing SEC-related criminal matters, cryptocurrency, whistleblowers, insider trading, cybersecurity, and much more.
WSGR Events
Building Patent Portfolio Value and Strategic Licensing Trends for In-House Counsel
Patent portfolios are under increasing pressure to do more than protect innovation. In today’s market, in-house legal teams are being asked to manage costs, support business growth, and think more strategically about how patent assets can create long-term value. That includes making smart decisions about portfolio development and pruning, while also understanding how licensing structures, acquisitions, and patent pools can help advance business goals and reduce risk. 
View All
Matthew A. Argenti
Partner
Palo Alto
Matt is an experienced patent litigatior with an focus on post-grant review proceedings before the PTAB.
  • Litigation
View Profile
Christine K. Au-Yeung
Partner
San Francisco
Christine Au-Yeung is a partner in the San Francisco and Palo Alto offices of Wilson Sonsini Goodrich & Rosati, where she specializes in trademark, copyright, and advertising law. She counsels clients on all aspects of brand protection in the U.S. and throughout the world, including clearance and selection of trademarks, prosecution of trademark applications, licensing, and the resolution of trademark infringement and domain name disputes. She also advises clients on advertising issues, including TCPA compliance related to marketing calls and texts as well as strategies on promotions such as sweepstakes and contests.
  • Trademark and Advertising
View Profile
Colleen Bal
Partner
San Francisco
Colleen is a nationally recognized trial lawyer with a proven track record of handling difficult and high-profile cases for leading technology, life sciences, and financial companies.
  • Litigation
View Profile
Joshua A. Baskin
Partner
San Francisco
Joshua Baskin is a partner in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where he maintains a leading trial practice. Josh has significant jury trial experience in state and federal courts across the country, including in trade secret, trademark, and commercial contract trials. In just the past few years, Josh obtained a complete defense verdict in a trade secret jury trial in California state court in which the plaintiff sought over a billion dollars, won a directed verdict in a trademark infringement trial on behalf of the defendant where the parties shared the same name, and obtained a multimillion-dollar verdict from a federal jury in a breach of contract action.

Josh is a cutting-edge talent in marshalling complex facts and incorporating them into trial presentations. He has a complete command of modern trial technology and uses it to streamline trial preparation and communicate to courts and juries.

In addition to his trial practice, Josh is deeply committed to pro bono work. He has taken on several high-impact pro bono cases addressing environmental protection issues.
  • Litigation
View Profile
David J. Berger
Partner
Palo Alto
David is an expert in and leader of the corporate governance and shareholder activism practices.
  • Litigation
View Profile
William B. Chandler III
Partner
Wilmington, DE
Mr. Chandler represents clients in governance matters, committee assignments, internal investigations, and transactional matters.
  • Litigation
View Profile
Christopher Chiou
Partner
Los Angeles
Chris Chiou is a litigation partner in the Los Angeles office of Wilson Sonsini Goodrich & Rosati. He represents clients in high-stakes complex commercial litigation and investigations, with an emphasis on business disputes. Chris is experienced in all stages of litigation, from counseling clients before lawsuits are filed through trying cases before juries. He also leads internal investigations on behalf of corporations and advises them on compliance issues, including providing Foreign Corrupt Practices Act training to executives at multinational companies. Chris is certified by the International Association of Privacy Professionals in information privacy and data protection.

Before joining the firm, Chris served as Acting U.S. Attorney for the District of Nevada. As the district’s chief federal law enforcement officer, he oversaw criminal and civil cases brought on behalf of the United States, including financial litigation cases, and prosecuted cybercrime (particularly ransomware and business email compromise), white collar crime, and public corruption. In 2021, Chris served on a nationwide task force to determine how the U.S. Department of Justice can more effectively combat hate crimes and hate incidents.

Chris was previously a partner at Jenner & Block, where he helped start the Los Angeles office in 2009.
  • Litigation
View Profile
Andrew D. Cordo
Partner
Wilmington, DE
Andrew (Andy) Cordo is a partner in the litigation practice at Wilson Sonsini Goodrich & Rosati’s Wilmington, Delaware, office.
  • Litigation
View Profile
Ben Crosson
Partner
Palo Alto
Ben represents clients in complex litigation matters and advises them in conjunction with government and internal investigations.
  • Litigation
View Profile
Leo Cunningham
Partner
Palo Alto
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
  • Litigation
View Profile
View All
People
Matthew A. Argenti
Partner
Palo Alto
Matt is an experienced patent litigatior with an focus on post-grant review proceedings before the PTAB.
  • Litigation
View Profile
Christine K. Au-Yeung
Partner
San Francisco
Christine Au-Yeung is a partner in the San Francisco and Palo Alto offices of Wilson Sonsini Goodrich & Rosati, where she specializes in trademark, copyright, and advertising law. She counsels clients on all aspects of brand protection in the U.S. and throughout the world, including clearance and selection of trademarks, prosecution of trademark applications, licensing, and the resolution of trademark infringement and domain name disputes. She also advises clients on advertising issues, including TCPA compliance related to marketing calls and texts as well as strategies on promotions such as sweepstakes and contests.
  • Trademark and Advertising
View Profile
Colleen Bal
Partner
San Francisco
Colleen is a nationally recognized trial lawyer with a proven track record of handling difficult and high-profile cases for leading technology, life sciences, and financial companies.
  • Litigation
View Profile
Joshua A. Baskin
Partner
San Francisco
Joshua Baskin is a partner in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where he maintains a leading trial practice. Josh has significant jury trial experience in state and federal courts across the country, including in trade secret, trademark, and commercial contract trials. In just the past few years, Josh obtained a complete defense verdict in a trade secret jury trial in California state court in which the plaintiff sought over a billion dollars, won a directed verdict in a trademark infringement trial on behalf of the defendant where the parties shared the same name, and obtained a multimillion-dollar verdict from a federal jury in a breach of contract action.

Josh is a cutting-edge talent in marshalling complex facts and incorporating them into trial presentations. He has a complete command of modern trial technology and uses it to streamline trial preparation and communicate to courts and juries.

In addition to his trial practice, Josh is deeply committed to pro bono work. He has taken on several high-impact pro bono cases addressing environmental protection issues.
  • Litigation
View Profile
David J. Berger
Partner
Palo Alto
David is an expert in and leader of the corporate governance and shareholder activism practices.
  • Litigation
View Profile
William B. Chandler III
Partner
Wilmington, DE
Mr. Chandler represents clients in governance matters, committee assignments, internal investigations, and transactional matters.
  • Litigation
View Profile
Christopher Chiou
Partner
Los Angeles
Chris Chiou is a litigation partner in the Los Angeles office of Wilson Sonsini Goodrich & Rosati. He represents clients in high-stakes complex commercial litigation and investigations, with an emphasis on business disputes. Chris is experienced in all stages of litigation, from counseling clients before lawsuits are filed through trying cases before juries. He also leads internal investigations on behalf of corporations and advises them on compliance issues, including providing Foreign Corrupt Practices Act training to executives at multinational companies. Chris is certified by the International Association of Privacy Professionals in information privacy and data protection.

Before joining the firm, Chris served as Acting U.S. Attorney for the District of Nevada. As the district’s chief federal law enforcement officer, he oversaw criminal and civil cases brought on behalf of the United States, including financial litigation cases, and prosecuted cybercrime (particularly ransomware and business email compromise), white collar crime, and public corruption. In 2021, Chris served on a nationwide task force to determine how the U.S. Department of Justice can more effectively combat hate crimes and hate incidents.

Chris was previously a partner at Jenner & Block, where he helped start the Los Angeles office in 2009.
  • Litigation
View Profile
Andrew D. Cordo
Partner
Wilmington, DE
Andrew (Andy) Cordo is a partner in the litigation practice at Wilson Sonsini Goodrich & Rosati’s Wilmington, Delaware, office.
  • Litigation
View Profile
Ben Crosson
Partner
Palo Alto
Ben represents clients in complex litigation matters and advises them in conjunction with government and internal investigations.
  • Litigation
View Profile
Leo Cunningham
Partner
Palo Alto
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
  • Litigation
View Profile
View All
Related Practices
  • Antitrust Litigation
  • Arbitration
  • Board and Internal Investigations
  • Class Action Litigation
  • Commercial Litigation
  • Consumer Litigation
  • Corporate Governance Litigation
  • Employment Litigation
  • Government Investigations
  • Internet Strategy and Litigation
  • Patent Litigation
  • Securities Litigation
  • Supreme Court and Appellate
  • Trade Secret Litigation
  • Trademark and Advertising
  • Trademark and Copyright Litigation
  • White Collar Crime
Recent Insights
Alerts
Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
Learn More
Alerts
California Attorney General Targets MSO-PC Structures: What the Art Center Holdings Amicus Brief Means for CPOM Compliance
Executive Summary
Learn More
View All
Recent Events
WSGR Events
Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
Learn More
Affiliated Programs
IPBC Global 2026
Wilson Sonsini is proud to sponsor the IPBC Global 2026 on June 15-17, 2026, at the InterContinental San Diego. Partner Michael Levin will serve as the moderator for this panel, "IP: The Voice of Value" on Wednesday, June 17 at 10:10 a.m.-11:10 a.m. and will be joined by leaders from Burford Capital, Qualcomm Technology Licensing, Dolby Laboratories, BASF and Sisvel International SA.
Learn More
View All
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