With clients at greater risk for securities litigation than ever, O’Melveny is a critical source of innovative solutions and trusted counsel. We are a securities and defense bar leader, providing our clients with experienced, creative representation in all aspects of securities litigation.

Our nationally recognized team defends underwriters, corporations, and directors and officers in Securities Act and Exchange Act class actions, institutional investor suits, proxy challenges, derivative lawsuits, customer disputes, high-stakes merger-and-acquisition related litigation, and Antiterrorism Act private suits. Our record is especially strong when it comes to defending the world’s leading financial institutions in their securities litigation matters.

    • Our lawyers are among a select few who have successfully tried securities-related cases to jury verdict. 
    • We were the first firm to form a task force dedicated solely to counseling China-based companies that have US exchange-listed shares on the increased scrutiny by the US Securities and Exchange Commission, Congress, and the plaintiffs’ class-action bar.
    • We have deep experience defending China-based US-listed public companies in securities class actions in US courts.


O’Melveny won a major victory for Actavis PLC (formerly Watson Pharmaceuticals), when the Third Circuit affirmed the dismissal of a securities class action against its client and co-defendant Columbia Laboratories Inc.   Read

Case Study: China Agritech

In a rare accomplishment in securities litigation, we successfully defended China Agritech, a Chinese fertilizer manufacturer, and certain of its officers and directors in three successive class actions, twice defeating motions for class certification and securing dismissal of the third case on statute of limitations grounds. Read

Chief Financial Officer

We achieved a complete victory in an alleged securities fraud case brought by the SEC’s trial unit against our client Thomas C. Tekulve, Jr., the former CFO of Basin Water, Inc. Read

Fannie Mae

After nearly a decade of hard-fought litigation, we led Fannie Mae in settling a consolidated securities class action pending in the District of Columbia, where we had convinced the Judicial Panel on Multidistrict Litigation to create an MDL. Read

Giant Interactive

O’Melveny successfully defended Giant Interactive, one of China’s leading online game developers and operators, in a shareholder class action seeking to enjoin Giant’s proposed going-private transaction, which O’Melveny also successfully handled.   Read


We won dismissal for Credit Suisse, Morgan Stanley, and Goldman Sachs, the lead underwriters in the US$1 billion public offering by YPF Sociedad Anonima, in a putative securities class action in the Southern District of New York. Read

Underwriting Syndicate

An underwriting syndicate led by Morgan Stanley secured an important victory when O’Melveny convinced the plaintiffs to voluntarily dismiss them from a case more than three years after it had been filed and shortly after fact discovery had closed. Read
    • China Agritech, Inc.
    • Credit Suisse
    • Fannie Mae
    • Goldman Sachs
    • Morgan Stanley
    • Powerwave Technologies, Inc.