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Sonya Winner

A litigator with three decades of experience, Sonya Winner handles high-stakes civil cases for clients in a wide range of industries, including banking, pharmaceuticals and professional sports.  She has handled numerous antitrust and consumer disputes, many of them class actions, in state and federal courts across the country.

Sonya’s cases typically involve difficult technical issues and/or complex legal and regulatory schemes. She is regularly able to resolve cases before the trial phase, often through dispositive motions. But when neither summary judgment nor a favorable settlement is an option, she has the confidence of her clients to take the case all the way through trial and on appeal. Her recent successes have included a cutting-edge decision rejecting a “true lender” challenge to National Bank Act preemption in a class action involving interest rates on student loans, as well as the outright dismissal of a putative antitrust claim against the National Football League and its member clubs asserting an unlawful conspiracy to fix cheerleader compensation.

Sonya has been recognized as a leading trial lawyer by publications like Chambers and the Daily Journal. She is chair of the firm’s Class Action Litigation Practice Group.

Contact:Read more about Sonya WinnerEmail

            The Ninth Circuit continues its efforts to give teeth to the predominance requirement of Rule 23 as a potent tool for defendants to defeat class certification. 

            Earlier this year, in Bowerman v. Field Asset Services, Inc., 39 F.4th 652 (9th Cir. 2022), amended, — F.4th —-, 2023 WL 2001967 (9th Cir. Feb. 14, 2023), the Ninth Circuit determined that where individualized inquiries were necessary to determine the existence of damages—as opposed to the question of calculating damages—class certification was inappropriate because the class would fail to meet the predominance requirement of Rule 23. 

Continue Reading Ninth Circuit Sharpens Predominance Requirement:  Looking Behind Plaintiffs’ Fiction in Dismantling Class Certification

In two putative class actions pending in the Eastern District of North Carolina, the Department of Justice has filed statements of interest urging the Court to deny defendants’ motions to compel arbitration of plaintiffs’ claims for violations of the Servicemembers Civil Relief Act.

In Padao v. American Express National Bank…

Continue Reading DOJ Weighs in on Enforceability of Arbitration Agreements Involving Servicemembers

A procedural violation of a state’s privacy statute is not alone enough to establish Article III standing—a plaintiff must suffer a concrete injury, such as an increased risk of identity theft.  The Fourth Circuit’s decision in O’Leary v. TrustedID, Inc., 2023 WL 2125996 (4th Cir. Feb. 21, 2023) confirms this—but also illustrates how Article III standing is a two-edged sword that may allow a plaintiff to defeat a defendant’s attempt to remove a case to federal court. 

The plaintiff in O’Leary filed a class action against TrustedID in South Carolina state court for allegedly violating South Carolina’s Financial Identity Fraud and Identity Theft Protection Act, S.C. Code Ann. § 37-20-180.  The statute prohibits requiring consumers to use six or more digits of their Social Security numbers to access a website without also requiring some other authentication measure.  The plaintiff alleged that TrustedID’s website required him to provide six digits of his Social Security number and did not have any other safety precautions, such as a password requirement.

Continue Reading Fourth Circuit Remands Class Action to State Court After Plaintiff Questions His Own Standing

The Ninth Circuit recently held in Chamber of Commerce v. Bonta that the Federal Arbitration Act preempts a California law that criminalizes employer conduct that requires employees to consent to arbitrate claims arising under the California Fair Employment and Housing Act.  This ruling came after the same panel previously held that the law, Assembly Bill 51, was not preempted because it focused on “pre-agreement” behavior and not the arbitration agreement itself.  In 2021, the panel sua sponte decided to rehear the case, apparently after Judge Fletcher (who was in the majority in both decisions) changed his mind on the law’s validity.  In doing so, the panel eliminated a circuit split it had previously created between itself and the First and Fourth Circuits.

Continue Reading Ninth Circuit Reverses Course on Arbitration

In a one-line order issued last week, the Supreme Court dismissed In Re Grand Jury, No. 21-1397, one of the most significant cases about the attorney-client privilege in decades.  The dismissal came just two weeks after oral argument.  The Court explained that the writ of certiorari had been “improvidently…

Continue Reading SCOTUS Dismisses Case on the Scope of the Attorney-Client Privilege

Under the Ninth Circuit’s 2020 decision in Sonner v. Premier Nutrition Corp., 971 F.3d 834 (9th Cir. 2020), plaintiffs cannot recover equitable relief in federal court if they have an adequate legal remedy.  More than two years later, district courts remain divided on how to apply Sonner at the pleading stage, with some postponing the analysis to later stages and others routinely dismissing equitable claims.  In courts that take the stricter view, Sonner can be a useful tool for narrowing the claims class action defendants must litigate in a federal case, particularly in California, where common consumer protection claims are largely limited to equitable remedies.  That said, a pair of recent Ninth Circuit decisions highlights that defendants should carefully consider the risk that a plaintiff will refile dismissed equitable claims in state court.

Continue Reading A Closer Look: Equitable Jurisdiction in the Ninth Circuit After Sonner

The Supreme Court recently granted certiorari in a case to resolve a circuit split that has serious implications for companies who are unsuccessful in their efforts to enforce arbitration provisions in federal district courts. 

In Coinbase, Inc. v. Bielski, No. 22-105, the defendant moved to compel arbitration in two putative class actions.  The motions to compel were denied, and the defendant sought stays while it appealed the denials—which the Federal Arbitration Act gives defendants an automatic right to do.  See 9 U.S.C. § 16.  Both motions to stay were denied, and the Ninth Circuit affirmed both decisions.

Continue Reading SCOTUS Set to Resolve Circuit Split over Stays Pending Arbitration Appeal

We previously wrote about the rising trend of mass arbitration and how companies and arbitration providers have responded to it thus far, including by adopting new rules and contract terms specifically geared towards coordinated proceedings.  It may be tempting to impose strict controls on how mass arbitrations can proceed.  But…

Continue Reading Mass Arbitration Procedures and Strategies Tested in Litigation

When a class action is filed, defendants often wonder whether tendering a payment to a class representative can defeat the claims.  In a recent decision, the Third Circuit held that a mid-litigation payment to a class representative plaintiff does not moot her claim if the check is not cashed.  Duncan v. Governor of the Virgin Islands, — F.4th —-, 2022 WL 3906213 (3d Cir. Aug. 31, 2022).  But tendering the payment, even if the check is uncashed and even if the plaintiff claims the payment does not cover the full value of her claim, did make the plaintiff an atypical class representative and provided a basis to defeat certification of a damages class.

Continue Reading Post-Litigation Refund Check Does Not Moot Class Representative’s Damages Claim, but It Does Defeat Class Certification

We previously wrote about Chamber of Commerce v. Bonta, 13 F.4th 766 (9th Cir. 2021), in which a split panel of the Ninth Circuit held that the Federal Arbitration Act does not preempt a California Labor Code provision prohibiting employers from requiring applicants or employees “to waive any…

Continue Reading Ninth Circuit Panel To Reconsider Whether FAA Preempts California Labor Law