Pfizer accused an employee of uploading more than 12,000 company files to her personal accounts.
Pfizer has accused a longtime employee of stealing "scores" of confidential documents from the company.
These included documents related to Pfizer's COVID-19 vaccine, the company said in a lawsuit.
Pfizer is suing Chun Xiao Li, who is resigning after 15 years at the company.
Pfizer has sued a longtime employee for allegedly stealing "scores" of confidential documents, including some related to its COVID-19 vaccine, as she prepared to jump to a competitor.
In a complaint filed on Tuesday in San Diego federal court, Pfizer said Chun Xiao Li breached her confidentiality agreement by uploading more than 12,000 files without permission to her personal accounts and devices from her company-issued laptop.
The alleged materials include a September 24 "playbook" containing internal assessments and recommendations about the Pfizer/BioNTech COVID-19 vaccine, Pfizer's relationship with its German vaccine partner, and presentations related to cancer antibodies.
Pfizer said Li, an associate director of statistics, tried repeatedly to cover her tracks, even providing a "decoy" laptop.
Li "has misled Pfizer about what she took, how she took it, when and why she did it, and where those files (and possibly others) can be found," the New York-based drugmaker said.
Pfizer said Li is resigning after 15 years at the company, and appears to have an offer to join Xencor, a California clinical-stage company focusing on treatments for cancer and autoimmune diseases, on November 29.
Li could not immediately be reached for comment through her LinkedIn account. Xencor is not a defendant in the lawsuit, and declined to comment.
Pfizer said competitors have been trying to recruit its employees "relentlessly, especially during 2021."
In an order late on Tuesday, US District Judge Cathy Ann Bencivengo temporarily blocked Li from using Pfizer's trade secrets, and said the company's lawyers can review accounts and devices where she might have stored them.
The judge scheduled a December 9 hearing to consider a longer injunction.
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