Securities Litigation
-
Wide-Ranging Practice
Wilson Sonsini has defended virtually every conceivable type of securities class action, including, for example, disputes involving alleged financial fraud, financial forecasts, and product-related issues.
-
Substantial Experience Representing Companies in Technology, Life Sciences, and Other Major Industries
In addition to representing clients throughout the technology and life sciences sectors, our securities litigation team has represented companies in other major industries, including aerospace and defense, consumer products, energy, and financial services.
-
Accomplished Securities Litigators
Wilson Sonsini's Securities Litigation practice and its attorneys have been recognized as leading practitioners in legal industry rankings, including Chambers USA.
Wilson Sonsini's Securities Litigation practice is characterized by a unique and sophisticated understanding of our clients' businesses. This understanding allows us to execute creative, aggressive strategies in litigation. We have built a reputation as one of the top securities defense firms in the country, and have defended cases in more than 30 states and in all of the federal courts.
We have also represented companies, their directors, and officers in other closely related types of litigation, including shareholder derivative lawsuits alleging breaches of fiduciary duties, and formal and informal investigations before the Securities and Exchange Commission and other regulatory agencies. We have defended virtually every conceivable type of securities class action, including cases involving alleged financial fraud, new drugs and medical devices, defective products, and financial forecasts.
In addition to representing clients throughout the technology and life sciences sectors, our securities litigation team has represented companies in other major industries, including aerospace and defense, consumer products, energy, and financial services.
Our demonstrated and sustained ability to win cases across the country and in a wide variety of industries places us in a unique position among leading defense firms. In addition, our track record of success provides leverage that enables our clients to obtain favorable settlements.
Overview
Wilson Sonsini's Securities Litigation practice is characterized by a unique and sophisticated understanding of our clients' businesses. This understanding allows us to execute creative, aggressive strategies in litigation. We have built a reputation as one of the top securities defense firms in the country, and have defended cases in more than 30 states and in all of the federal courts.
We have also represented companies, their directors, and officers in other closely related types of litigation, including shareholder derivative lawsuits alleging breaches of fiduciary duties, and formal and informal investigations before the Securities and Exchange Commission and other regulatory agencies. We have defended virtually every conceivable type of securities class action, including cases involving alleged financial fraud, new drugs and medical devices, defective products, and financial forecasts.
In addition to representing clients throughout the technology and life sciences sectors, our securities litigation team has represented companies in other major industries, including aerospace and defense, consumer products, energy, and financial services.
Our demonstrated and sustained ability to win cases across the country and in a wide variety of industries places us in a unique position among leading defense firms. In addition, our track record of success provides leverage that enables our clients to obtain favorable settlements.
Newsletters
Litigation Trends to Watch in 2026
Entering 2026, Wilson Sonsini litigators see a landscape defined by AI driven disputes, continued tightening of patent review standards, renewed securities and governance litigation, stronger consumer and influencer enforcement, and escalating Telephone Consumer Protection Act (TCPA) exposure—trends that require companies to align legal strategy with technical and operational controls.
News Articles
Greg Watts of Wilson Sonsini Releases Definitive Guide on Directors’ and Officers’ Liability
Gregory Watts, a partner at Wilson Sonsini, sheds light on one of corporate law’s most complex areas in his latest book, Directors' and Officers' Liability: Current Law, Recent Developments, Emerging Issues (Fourth Edition), published by the Practising Law Institute. Written for corporate counsel, private practitioners, and directors themselves, the book provides a comprehensive roadmap through the responsibilities, protections, and potential pitfalls facing directors and officers of public companies, combining current law with recent developments and emerging trends.
News Articles
Caz Hashemi Named Among Securities Docket's 2025 Enforcement Elite
On October 30, 2025, Securities Docket named Wilson Sonsini litigation partner Caz Hashemi to its Enforcement Elite, a list of the best securities enforcement defense lawyers in the industry. The honorees hail from the top law firms in the world and have been key players in some of the most significant SEC enforcement matters over the past few decades.
Alerts
SEC Issues Policy Statement Clarifying View on Mandatory Arbitration Provisions
On September 17, 2025, the U.S. Securities and Exchange Commission (SEC or Commission) approved a Policy Statement clarifying the SEC’s position on accelerating the effective date of registration statements for the offer and sale of securities under the Securities Act filed by companies that have mandatory arbitration provisions in their governing documents. The Policy Statement represents a significant development in the SEC’s approach to filings by companies with mandatory arbitration provisions applicable to claims under the federal securities laws—and potentially other governance claims as well. The Policy Statement also comes at a time of growing debate over the proper role of stockholder litigation as a policy matter and the optimal approach to such matters under state corporate law.
News Articles
Securities Docket Names Caz Hashemi Among 2024 “Enforcement Elite”
On November 6, 2024, Wilson Sonsini’s Caz Hashemi was honored among Securities Docket’s “Enforcement Elite” for 2024, an elite list of the best securities enforcement defense lawyers in the business. The 140 lawyers selected to the list are from many of the top law firms in the world and have been key players in some of the most significant SEC enforcement matters over the past few decades.
Insights
Newsletters
Litigation Trends to Watch in 2026
Entering 2026, Wilson Sonsini litigators see a landscape defined by AI driven disputes, continued tightening of patent review standards, renewed securities and governance litigation, stronger consumer and influencer enforcement, and escalating Telephone Consumer Protection Act (TCPA) exposure—trends that require companies to align legal strategy with technical and operational controls.
News Articles
Greg Watts of Wilson Sonsini Releases Definitive Guide on Directors’ and Officers’ Liability
Gregory Watts, a partner at Wilson Sonsini, sheds light on one of corporate law’s most complex areas in his latest book, Directors' and Officers' Liability: Current Law, Recent Developments, Emerging Issues (Fourth Edition), published by the Practising Law Institute. Written for corporate counsel, private practitioners, and directors themselves, the book provides a comprehensive roadmap through the responsibilities, protections, and potential pitfalls facing directors and officers of public companies, combining current law with recent developments and emerging trends.
News Articles
Caz Hashemi Named Among Securities Docket's 2025 Enforcement Elite
On October 30, 2025, Securities Docket named Wilson Sonsini litigation partner Caz Hashemi to its Enforcement Elite, a list of the best securities enforcement defense lawyers in the industry. The honorees hail from the top law firms in the world and have been key players in some of the most significant SEC enforcement matters over the past few decades.
Alerts
SEC Issues Policy Statement Clarifying View on Mandatory Arbitration Provisions
On September 17, 2025, the U.S. Securities and Exchange Commission (SEC or Commission) approved a Policy Statement clarifying the SEC’s position on accelerating the effective date of registration statements for the offer and sale of securities under the Securities Act filed by companies that have mandatory arbitration provisions in their governing documents. The Policy Statement represents a significant development in the SEC’s approach to filings by companies with mandatory arbitration provisions applicable to claims under the federal securities laws—and potentially other governance claims as well. The Policy Statement also comes at a time of growing debate over the proper role of stockholder litigation as a policy matter and the optimal approach to such matters under state corporate law.
News Articles
Securities Docket Names Caz Hashemi Among 2024 “Enforcement Elite”
On November 6, 2024, Wilson Sonsini’s Caz Hashemi was honored among Securities Docket’s “Enforcement Elite” for 2024, an elite list of the best securities enforcement defense lawyers in the business. The 140 lawyers selected to the list are from many of the top law firms in the world and have been key players in some of the most significant SEC enforcement matters over the past few decades.
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.
Affiliated Programs
2026 BYU Winter Deals Conference
Wilson Sonsini is proud to sponsor BYU Law School’s Winter Deals Conference. The conference brings together leading scholars and practitioners to discuss the modern global economy’s most pressing legal issues from mergers and acquisitions to venture capital to corporate governance, and more. Litigation partner Dan Iqbal will serve as a panelist on the Keynote Panel with Justice Karen Valihura (Delaware Supreme Court) on Friday, February 6 at 6:10 p.m. For more details, please visit the event website.
Speaking Engagements
Securities Enforcement Forum West 2025
Securities Enforcement Forum West brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel and compliance executives, and other top professionals in the field. This year’s conference will be held on Thursday, May 15, 2025, and will also be available for attendees to view live online.
Speaking Engagements
Delaware Law Developments 2025: What All Business Lawyers Need to Know
Wilson Sonsini Litigation Partner Brad Sorrels and Corporate Partner Amy Simmerman will speak at PLI’s upcoming program titled “Delaware Law Developments 2025: What All Business Lawyers Need to Know.” The program will focus on significant developments in Delaware corporate law over the past year, examining the latest case law and practical trends while offering insights and advice on the most pressing issues facing the corporate and securities legal community.
Affiliated Programs
Association of Corporate Counsel San Francisco Bay Area — Deal or No Deal
Wilson Sonsini is proud to sponsor the Association of Corporate Counsel San Francisco Bay Area’s biggest event of the year — Deal or No Deal. The day includes 6 hours of CLE programs on topics focused on contracts, transactions, and related case law, as well as numerous networking opportunities. All in-house counsel are welcome to attend.
Events
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.
Affiliated Programs
2026 BYU Winter Deals Conference
Wilson Sonsini is proud to sponsor BYU Law School’s Winter Deals Conference. The conference brings together leading scholars and practitioners to discuss the modern global economy’s most pressing legal issues from mergers and acquisitions to venture capital to corporate governance, and more. Litigation partner Dan Iqbal will serve as a panelist on the Keynote Panel with Justice Karen Valihura (Delaware Supreme Court) on Friday, February 6 at 6:10 p.m. For more details, please visit the event website.
Speaking Engagements
Securities Enforcement Forum West 2025
Securities Enforcement Forum West brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel and compliance executives, and other top professionals in the field. This year’s conference will be held on Thursday, May 15, 2025, and will also be available for attendees to view live online.
Speaking Engagements
Delaware Law Developments 2025: What All Business Lawyers Need to Know
Wilson Sonsini Litigation Partner Brad Sorrels and Corporate Partner Amy Simmerman will speak at PLI’s upcoming program titled “Delaware Law Developments 2025: What All Business Lawyers Need to Know.” The program will focus on significant developments in Delaware corporate law over the past year, examining the latest case law and practical trends while offering insights and advice on the most pressing issues facing the corporate and securities legal community.
Affiliated Programs
Association of Corporate Counsel San Francisco Bay Area — Deal or No Deal
Wilson Sonsini is proud to sponsor the Association of Corporate Counsel San Francisco Bay Area’s biggest event of the year — Deal or No Deal. The day includes 6 hours of CLE programs on topics focused on contracts, transactions, and related case law, as well as numerous networking opportunities. All in-house counsel are welcome to attend.
Lester Ang
Partner
Lester Ang is a corporate and securities partner in the Palo Alto office of Wilson Sonsini, where he works with private and public technology and life sciences companies through all stages of their growth, as well as with venture capital firms and private equity firms.
David J. Berger
Partner
David is an expert in and leader of the corporate governance and shareholder activism practices.
William B. Chandler III
Partner
Mr. Chandler represents clients in governance matters, committee assignments, internal investigations, and transactional matters.
Andrew D. Cordo
Partner
Andrew (Andy) Cordo is a partner in the litigation practice at Wilson Sonsini Goodrich & Rosati’s Wilmington, Delaware, office.
Ben Crosson
Partner
Ben represents clients in complex litigation matters and advises them in conjunction with government and internal investigations.
Leo Cunningham
Partner
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
John P. Flynn
Partner
John is a veteran trial lawyer with 30 years of experience in high-stakes, enterprise-threatening corporate and commercial litigation.
Shannon E. German
Partner
Shannon German is a partner in the Wilmington office of Wilson Sonsini Goodrich & Rosati. Her practice focuses on corporate governance litigation and counseling, navigation of corporate fiduciary duties, and representation of companies and their officers and directors in stockholder class actions, derivative suits, and complex commercial litigation in the Delaware Court of Chancery and the Delaware Supreme Court. She also represents clients in stockholder class actions, derivative suits, and securities actions in the state and federal courts throughout the country.
Caz Hashemi
Partner
Caz is head of Wilson Sonsini’s litigation department and a member of the firm’s board of directors. He is nationally recognized as one of the top attorneys in his field of practice, regularly representing clients in high stakes securities litigation and government investigation matters.
Katherine L. Henderson
Partner
Katherine represents companies and their officers and directors in stockholder class actions, derivative suits, and complex commercial litigation.
People
Lester Ang
Partner
Lester Ang is a corporate and securities partner in the Palo Alto office of Wilson Sonsini, where he works with private and public technology and life sciences companies through all stages of their growth, as well as with venture capital firms and private equity firms.
David J. Berger
Partner
David is an expert in and leader of the corporate governance and shareholder activism practices.
William B. Chandler III
Partner
Mr. Chandler represents clients in governance matters, committee assignments, internal investigations, and transactional matters.
Andrew D. Cordo
Partner
Andrew (Andy) Cordo is a partner in the litigation practice at Wilson Sonsini Goodrich & Rosati’s Wilmington, Delaware, office.
Ben Crosson
Partner
Ben represents clients in complex litigation matters and advises them in conjunction with government and internal investigations.
Leo Cunningham
Partner
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
John P. Flynn
Partner
John is a veteran trial lawyer with 30 years of experience in high-stakes, enterprise-threatening corporate and commercial litigation.
Shannon E. German
Partner
Shannon German is a partner in the Wilmington office of Wilson Sonsini Goodrich & Rosati. Her practice focuses on corporate governance litigation and counseling, navigation of corporate fiduciary duties, and representation of companies and their officers and directors in stockholder class actions, derivative suits, and complex commercial litigation in the Delaware Court of Chancery and the Delaware Supreme Court. She also represents clients in stockholder class actions, derivative suits, and securities actions in the state and federal courts throughout the country.
Caz Hashemi
Partner
Caz is head of Wilson Sonsini’s litigation department and a member of the firm’s board of directors. He is nationally recognized as one of the top attorneys in his field of practice, regularly representing clients in high stakes securities litigation and government investigation matters.
Katherine L. Henderson
Partner
Katherine represents companies and their officers and directors in stockholder class actions, derivative suits, and complex commercial litigation.
Recent Insights
Newsletters
Litigation Trends to Watch in 2026
Entering 2026, Wilson Sonsini litigators see a landscape defined by AI driven disputes, continued tightening of patent review standards, renewed securities and governance litigation, stronger consumer and influencer enforcement, and escalating Telephone Consumer Protection Act (TCPA) exposure—trends that require companies to align legal strategy with technical and operational controls.
Learn More
News Articles
Greg Watts of Wilson Sonsini Releases Definitive Guide on Directors’ and Officers’ Liability
Gregory Watts, a partner at Wilson Sonsini, sheds light on one of corporate law’s most complex areas in his latest book, Directors' and Officers' Liability: Current Law, Recent Developments, Emerging Issues (Fourth Edition), published by the Practising Law Institute. Written for corporate counsel, private practitioners, and directors themselves, the book provides a comprehensive roadmap through the responsibilities, protections, and potential pitfalls facing directors and officers of public companies, combining current law with recent developments and emerging trends.
Learn More
Recent Events
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.
Learn More
Speaking Engagements
2026 PLUS D&O Symposium
Wilson Sonsini is proud to sponsor the 2026 PLUS D&O Symposium on March 3-4, 2026, at the Marriott Marquis in New York City. Partner Greg Watts will serve as a panelist for this program, "D&O Session: Worst Day Claims Scenario." Topics include:
Learn More
- Privacy Policy
- Terms of Use
- Accessibility
Copyright © 2026 Wilson Sonsini Goodrich & Rosati. All Rights Reserved.