Photo of Kathryn Cahoy

Kathryn Cahoy

Kate Cahoy co-chairs the firm’s Class Action Litigation Practice Group and serves on the leadership committee for the firm’s Technology Industry Group. A highly skilled litigator, she defends clients in complex, high-stakes class action disputes, securing significant victories across various industries, including technology, entertainment, consumer products, and financial services. Kate also plays a key role in the firm’s mass arbitration defense practice. She regularly advises companies on the risks associated with mass arbitration and has a proven track record of successfully defending clients against these challenges.

Leveraging her success in class action litigation and arbitration, Kate helps clients develop strategic and innovative solutions to their most challenging legal issues. She has extensive experience litigating cases brought under California’s Section 17200 and other consumer protection, competition, and privacy laws, including the Sherman Act, California Consumer Privacy Act (CCPA), California Invasion of Privacy Act (CIPA), Wiretap Act, Stored Communications Act, Children’s Online Privacy Protection Act (COPPA), Video Privacy Protection Act (VPPA), along with common law and constitutional rights of privacy, among others.

Kate’s exceptional legal work has earned widespread recognition. The Daily Journal named her successful defense of Meta and Microsoft cases described below as among its Top Verdicts, recognizing some of the largest and most impactful verdicts in California.

Recent Successes:

Represented Meta (formerly Facebook) in a putative nationwide advertiser class action alleging violations under the California Unfair Competition Law (UCL) related to charges from allegedly “fake” accounts. Successfully narrowed claims at the pleadings stage, defeated class certification, opposed a Rule 23(f) petition, won summary judgment, and defended the victory on appeal to the Ninth Circuit. (Daily Journal, Top Verdicts of 2021. Law.com recognized Kate with a Litigator of the Week Shoutout.
Defeated a landmark class action lawsuit against Microsoft and OpenAI contending that the defendants scraped data from the internet for training generative AI services and incorporated data from users’ prompts, allegedly in violation of CIPA, the Computer Fraud and Abuse Act (CFAA), and other privacy and consumer protection laws. (Daily Journal, Top Verdicts of 2024.)

Kate regularly contributes to the firm’s blog, Inside Class Actions, and was recently featured in a Litigation Daily interview titled “Where Privacy Laws and Litigation Trends Collide.” In recognition of her achievements in privacy and antitrust class action litigation, the Daily Journal named her as one of their Top Antitrust Lawyers (2024), Top Cyber Lawyers (2022), and Top Women Lawyers in California (2026). Additionally, she received the Women of Influence award from the Silicon Valley Business Journal, was recognized by the Daily Journal as a Top Attorney Under 40, and also was named to Bloomberg Law's They've Got Next: The 40 Under 40 list.

An Illinois federal court has dismissed a proposed class action alleging X Corp. violated the state’s Biometric Information Privacy Act (“BIPA”) through its use of PhotoDNA software to create “hashes” of images to scan for nudity and related content. The court held that Plaintiff failed to allege that the hashes identified photo subjects and therefore failed to allege that the hashes constituted biometric identifiers. Martell v. X Corp., 2024 WL 3011353, at *4 (N.D. Ill. June 13, 2024).

Continue Reading Illinois Federal Court Dismisses BIPA Suit Against X, Holding “Biometric Identifiers” Must Identify Individuals

Likely spurred by plaintiffs’ recent successes in cases under Illinois’s Biometric Information Privacy Act (“BIPA”), a new wave of class actions is emerging under Illinois’s Genetic Information Privacy Act (“GIPA”). While BIPA regulates the collection, use, and disclosure of biometric data, GIPA regulates that of genetic testing information. Each has a private right of action and provides for significant statutory damages, even potentially where plaintiffs allege a violation of the rule without actual damages.[1] From its 1998 enactment until last year, there were few GIPA cases, and they were largely focused on claims related to genetic testing companies.[2] More recently, plaintiffs have brought dozens of cases against employers alleging GIPA violations based on allegations of employers requesting family medical history through pre-employment physical exams. This article explores GIPA’s background, the current landscape and key issues, and considerations for employers.

Continue Reading Employers Beware: New Wave of Illinois Genetic Information Privacy Act Litigation

The Ninth Circuit recently held that the Children’s Online Privacy Protection Act, which gives the Federal Trade Commission  authority to regulate the online collection of personal information from children under the age of 13, does not preempt consistent state law, potentially increasing the risk of class action litigation based on

Continue Reading Ninth Circuit Holds COPPA Does Not Preempt Consistent State Law Claims Premised on COPPA Violations

In a new post on the Inside Class Actions blog, our colleagues discuss a recent Third Circuit decision reinstating the putative class action Clemens v. ExecuPharm Inc., concluding there was sufficient risk of imminent harm after a data breach to confer standing on the named plaintiff when the

Continue Reading Data Breach and the Dark Web: Third Circuit Allows Class Action Standing With Sufficient Risk of Harm

Last week, an Illinois federal district court granted the defendant’s motion to stay in Stegmann v. PetSmart, No. 1:22-cv-01179 (N.D. Ill.).  The case implicates the evolving law surrounding the scope of the Illinois Biometric Information Privacy Act (“BIPA”) and  a pending Illinois Supreme Court case that could provide an important defense to certain BIPA suits.

Continue Reading Federal Court Stays Suit Implicating Accrual of Claims Under the Illinois Biometric Information Privacy Act

Recent months have seen a growing trend of data privacy class actions asserting claims for alleged violations of federal and state video privacy laws.  In this year alone, plaintiffs have filed dozens of new class actions in courts across the country asserting claims under the federal Video Privacy Protection Act (“VPPA”), Michigan’s Preservation of Personal Privacy Act (“MPPPA”), and New York’s Video Consumer Privacy Act (“NYVCPA”).

Continue Reading Emerging Trends: Renewed Wave of Video Privacy Class Actions

An Illinois federal district court recently rejected dismissal of Illinois Biometric Information Privacy Act (“BIPA”) claims in In re Clearview AI, Inc., Consumer Privacy Litigation, No. 21-cv-135 (N.D. Ill.).  The Clearview plaintiffs alleged that Clearview violated their privacy rights without their knowledge and consent by scraping more than three billion photographs of facial images from the internet and using artificial intelligence algorithms on the images to harvest individuals’ unique facial biometric identifiers and corresponding biometric information.  Clearview sought dismissal of the BIPA claims under the First Amendment, extraterritoriality doctrine, dormant commerce clause, and BIPA’s express exemption for  photographs.  The court rejected these grounds, and declined to dismiss the BIPA claims.
Continue Reading Court Rejects Dismissal of Illinois Biometric Information Privacy Act Against Clearview AI in Pending Multidistrict Litigation

A California federal district court recently granted partial dismissal of privacy claims brought by several Google users in Rodriguez v. Google, LLC, No. 20-cv-5688 (N.D. Cal.).  The Rodriguez plaintiffs claimed that Google engaged in unlawful wiretapping under section 631 of the California Invasion of Privacy Act (“CIPA”) by collecting data from third-party apps after users turned off certain data tracking in their Google privacy settings; they also claimed that Google breached a unilateral contract they had formed by selecting those privacy settings.  The court disagreed, and dismissed these two claims without leave to amend.
Continue Reading Court Grants Dismissal of Wiretapping and Contract Claims in Putative Privacy Class Action Involving Google Privacy Settings

In a new post on the Inside Class Actions blog, our colleagues discuss a recent Western District of New York report and recommendation concluding that any risk of identity theft or other injury was too “speculative” to show standing in the putative data breach class action Tassmer et al
Continue Reading No Harm, No Foul: New York Federal Court Recommends Dismissing Sensitive Data Breach Class Action for Lack of Standing

Last week, in a decision that confirms the viability of cy pres settlements in privacy class action cases, the Ninth Circuit affirmed approval of a class action injunctive relief and cy pres-only settlement in In re Google Inc. Street View Electronic Communications Litigation, No. 20-15616, 2021 WL 6111383.  The case featured Wiretap Act claims based on Google Street View vehicles’ collection of “payload data,” including emails, passwords, and documents that Internet users transmitted over unencrypted Wi-Fi networks.
Continue Reading Ninth Circuit Affirms Approval of Injunctive Relief and Cy Pres Settlement of Google Street View Privacy Claims