Catherine T. Zeng (Kate)


Silicon Valley + 1.650.687.4132

Kate Zeng litigates complex cases with a focus on antitrust and unfair competition, class actions, product liability, and commercial disputes. She has represented companies in many industries, including the technology, education, health care, consumer products, nonprofit, and energy sectors. She has a broad range of experience in all aspects of litigation, including large-scale discovery, motion practice, working with experts and consultants, and trial.

Some of Kate's recent matters include securing a complete defense jury verdict after a five-week trial in a landmark health care antitrust class action. She was also part of the team that was recognized for obtaining a "Top Defense Verdict of 2021 in California" for a summary judgment win on behalf of a leading software company in a case that involved antitrust and trade secret claims. Other representations include defending technology and health care companies in multiple antitrust class actions and helping obtain a unanimous defense verdict for an off-road vehicle manufacturer after a three-month product liability trial.

Kate also spent a year in Jones Day's Shanghai Office where she worked extensively on internal investigations, antitrust, and international litigation matters. She also maintains an active pro bono practice.


  • Sutter Health wins complete defense verdict in landmark antitrust class actionJones Day won a complete defense jury verdict for Sutter Health in a landmark antitrust class action seeking $1.2 billion in treble damages.
  • SAP wins summary judgment on Teradata trade secret and antitrust claimsJones Day successfully defended SAP, one of the world's leading producers of software for the management of business processes, against trade secret and antitrust claims in a lawsuit filed in the Northern District of California.
  • Intuit obtains dismissal of antitrust lawsuit surrounding bilateral agreement regarding recruiting practicesJones Day client Intuit Inc. obtained dismissal of a putative class action alleging that Intuit and co-defendant eBay Inc. agreed not to solicit or hire each other's employees in violation of federal and California antitrust laws.
  • Adobe Systems resolves recruiting antitrust litigationJones Day client Adobe Systems Inc. reached a settlement agreement resolving a nationwide antitrust class action brought by current and former employees of Adobe, Apple, Google, Intel, Intuit, Lucasfilm or Pixar alleging conspiracy to fix and suppress employee compensation by entering into non-solicitation agreements.
  • Estate of Former CEO of incubator company defends against claims for breach of fiduciary duty by CEOJones Day successfully defended the estate of the former CEO of a technology incubator company in litigation alleging that, prior to his death, the CEO breached his fiduciary duties to investors.
  • Intuit defends against employee compensation antitrust class actionJones Day client Intuit Inc. successfully settled an antitrust class action brought on behalf of individuals employed by several technology companies alleging conspiracy to fix and suppress employee compensation by entering into non-solicitation agreements.
  • Working with Los Angeles Community Action Network, Jones Day wins appeal for pro bono clientDan Lynch appeared in the Appellate Division of the Los Angeles Superior Court for oral argument on an appeal from a traffic citation issued to a client in connection with Jones Day's support of and work for the Los Angeles Community Action network ("LA CAN").
  • Monolithic Power Systems and directors defeat derivative claims for breach of fiduciary dutyJones Day represented Monolithic Power Systems, Inc. and its directors in the successful defense of derivative claims for breach of fiduciary duty arising out of a negative shareholder vote on the company's "say on pay" proposal.
  • Lam Research defends claims of aiding and abetting breach of fiduciary duty in connection with acquisition of Novellus SystemsJones Day represented Lam Research Corporation in the defense of state and federal court complaints claiming that it aided and abetted alleged breaches of fiduciary duty by the directors of Novellus Systems, Inc. in connection with Lam Research's $3.3 billion acquisition of Novellus.
  • SAP AG and SAP America defend claims of aiding and abetting breach of fiduciary duty in connection with acquisition of SuccessFactorsJones Day represented SAP AG and SAP America, Inc., in defense of claims that SAP aided and abetted breaches of fiduciary duty by the directors of SuccessFactors in connection with SAP's $3.4 billion acquisition of SuccessFactors, Inc.
  • SunPower and Total partner to create new global leader in solar industry with $1.4 billion tender offerJones Day advised SunPower Corporation in the completion of the $1.4 billion tender offer by Total for up to 60% of SunPower's outstanding Class A Common Shares and 60% of SunPower's outstanding Class B Common Shares at a price of $23.25/share for each class.
  • Texas Instruments defends claims of breach of fiduciary duties in connection with $6.5 billion acquisition of National SemiconductorJones Day represented Texas Instruments Incorporated in defense of claims that it had aided and abetted breaches of fiduciary duties by the directors of National Semiconductor Corporation in connection with Texas Instruments' $6.5 billion acquisition of National.
  • Yamaha prevails in jury trial involving Rhino SxS vehicleAfter a three month trial in the Orange County Superior Court, Complex Division, a jury returned a defense verdict on behalf of Jones Day client Yamaha Motor Co. in a "bellwether" case involving the Yamaha Rhino SxS vehicle.
  • TMC HealthCare defends temporary nurses' antitrust class actionJones Day successfully defended TMC HealthCare in connection with an antitrust class action alleging a conspiracy to depress the wages paid to temporary nurses.
  • Banner Health System cleared by FTC to acquire Sun Health in ArizonaJones Day advised Banner Health System, Arizona's largest hospital system, on the antitrust aspects of its proposed acquisition of Sun Health.
  • Indigent tenants in Los Angeles receive assistance through the Bet Tzedek Unlawful Detainer Trial ProjectJones Day Los Angeles is working with Bet Tzedek, the House of Justice, to provide a valuable service to low-income families and individuals in need.