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Securities Litigation

For decades, clients have relied on our securities litigators in the most complex, high-profile, high-stakes securities matters of the day. The country’s most respected Fortune 500 corporations and financial institutions turn to us to help defend against headline-making allegations.

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Securities Litigation Nationwide
Chambers USA

Simpson Thacher is go-to counsel for companies, officers, directors, boards and special committees in connection with securities fraud and 10b-5 matters, responding to shareholder demands, handling derivative litigations, and investigations. We advise clients in all aspects of M&A litigation—where we excel at defending challenges to the largest and most complex mergers and acquisitions.

We also represent clients in government investigations that precede or follow on the heels of securities fraud litigation.

“Clients appreciate the firm’s strong trial capability and the breadth of its practice in both litigation and regulatory enforcement matters.”
The Legal 500 United States 2020

News & Events


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      Litigation Leaders: Simpson Thacher’s Jonathan Youngwood on Building a High Talent, Low Ego Litigation Culture
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      Simpson Thacher Recognized with Impact Case Award at Benchmark Litigation Awards 2021
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      Jonathan Youngwood Profiled in Law360 as an “MVP” in Class Actions
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      Simpson Thacher Honored as Securities Litigation Firm of the Year for Third Consecutive Year
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      Securities Law Alert Resource Center