Workday Opposes Class Certification in AI Hiring Bias Suit on November 10, 2026: Notes for HR

Workday asked a U.S. judge on November 10-11, 2026, to reject class certification in the long-running Mobley lawsuit alleging that its AI-powered screening software discriminated against job applicants on the basis of race, sex, age, and disability; HR operators should treat the filing as a reminder to document how their own tools are configured and used.

This is not legal advice. Consult counsel on specific compliance obligations.

What happened in the Workday case?

Mobley v. Workday, Inc. (No. 3:23-cv-00770, N.D. Cal., Judge Rita F. Lin) was filed in February 2023. Plaintiffs allege that Workday’s AI screening tools unlawfully discriminated against applicants on the basis of race, sex, age, and disability. In May 2025 the court preliminarily certified an age-discrimination collective that later grew to more than 15,000 opt-ins. Plaintiffs moved for full Rule 23 class certification on September 14, 2026.

On November 10-11, 2026, Workday filed its opposition and a related motion seeking to decertify the age collective. The company argued that the named plaintiffs have not shown Workday made any hiring decisions on behalf of its customers, so there is no common evidence that would allow the proposed classes to be certified. It also contended that employers configure the software differently, requiring individual review of each claim.

How does Workday’s argument work?

Workday’s core position is that its customers, not the software vendor, make the hiring decisions. The company said the three challenged features were built by different companies, trained on different data, and operate differently across customers, jobs, and time. It challenged the plaintiffs’ statistical analysis and said they have not shown that the AI evaluated or harmed them or caused discriminatory outcomes.

For the age collective, Workday argued that after 18 months of discovery the plaintiffs must now prove by substantial evidence that the more than 15,000 opt-in plaintiffs are similarly situated in ways material to their claims. No court has found Workday liable; the case remains in the class-certification phase.

Why does this matter for HR now?

The case is among the first significant actions aimed directly at an AI hiring vendor rather than solely at the employer that used the tool. Its outcome will influence how courts treat vendor liability for algorithmic screening. HR teams that rely on third-party AI for résumé scoring, ranking, or recommendation should pay attention to the commonality arguments: if configurations differ by customer, each employer’s implementation may be scrutinized separately.

Even without a liability finding, the litigation has already prompted notice to large groups of applicants and sustained discovery. Employers using similar tools should assume that both vendors and their own processes may face parallel scrutiny under Title VII, the ADEA, the ADA, and state analogs.

What should HR operators do this week?

Review contracts with Workday and other AI screening vendors for indemnification, limitation-of-liability, and data-use clauses. Document exactly how the tools are configured for each job family—thresholds, weighting of features, human-in-the-loop requirements, and any overrides. Retain records of disparate-impact monitoring or validation studies performed on the screening process.

Confirm that final hiring decisions remain with humans and that those decisions are documented. Coordinate with legal counsel on any pending applicant inquiries or EEOC charges that reference AI screening. Update internal guidelines so recruiters understand what the tools do and do not decide.

What to watch next?

Plaintiffs’ replies are due December 8, 2026. The class-certification hearing is set for March 9, 2027, at 10:00 a.m. before Judge Lin. A decision on certification (or decertification of the age collective) will be the next major milestone. Any ruling on whether a software vendor can be held liable for customer-configured AI will set an important precedent for other HR technology providers.

Parallel cases involving other AI hiring tools will also be worth monitoring, as will any regulatory guidance from the EEOC or state agencies on algorithmic employment decision tools.

Frequently Asked Questions

Has a court found Workday liable?
No. No court has found Workday liable. The case is still at the class-certification stage.

What is the case number and court?
Mobley v. Workday, Inc., No. 3:23-cv-00770, U.S. District Court for the Northern District of California, Judge Rita F. Lin.

When is the next hearing?
Class-certification hearing is scheduled for March 9, 2027.

Does the filing affect employers that use Workday?
Indirectly. The arguments about customer configuration and who makes the hiring decision mean employers should ensure their own processes and records are defensible.

What claims are alleged?
Disparate-impact claims under Title VII (race and sex), the ADEA (age), the ADA (disability), and California FEHA.

Son Güncelleme / Last Updated: November 13, 2026.

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