Opinion of the Court
fixtures and related products. In 2016, a hacker impersonating a company official tricked a Lamps Plus employee into disclosing the tax information of approximately 1,300 other employees. Soon after, a fraudulent federal income tax return was filed in the name of Frank Varela, a Lamps Plus employee and respondent here.
Like most Lamps Plus employees, Varela had signed an arbitration agreement when he started work at the company. But after the data breach, he sued Lamps Plus in Federal District Court in California, bringing state and federal claims on behalf of a putative class of employees whose tax information had been compromised. Lamps Plus moved to compel arbitration on an individual rather than classwide basis, and to dismiss the lawsuit. In a single order, the District Court granted the motion to compel arbitration and dismissed Varela’s claims without prejudice. But the court rejected Lamps Plus’s request for individual arbitration, instead authorizing arbitration on a classwide basis. Lamps Plus appealed the order, arguing that the court erred by compelling class arbitration.
The Ninth Circuit affirmed. 701 Fed. Appx. 670 (2017). The court acknowledged that Stolt-Nielsen prohibits forcing a party “to submit to class arbitration unless there is a contractual basis for concluding that the party agreed to do so” and that Varela’s agreement “include[d] no express mention of class proceedings.” 701 Fed. Appx., at 672. But that did not end the inquiry, the court reasoned, because the fact that the agreement “does not expressly refer to class arbitration is not the ‘silence’ contemplated in Stolt-Nielsen.” Ibid. In Stolt-Nielsen, the parties had stipulated that their agreement was silent about class arbitration. Because there was no such stipulation here, the court concluded that Stolt-Nielsen was not controlling.
The Ninth Circuit then determined that the agreement was ambiguous on the issue of class arbitration. On the one hand, as Lamps Plus argued, certain phrases in the
