Lucy Yen

Lucy Yen

Partner

Broad Litigation Practice

Lucy's practice focuses on intellectual property, antitrust, and complex commercial litigation.
Trial Experience

Lucy has extensive experience taking cases to trial, including complex cases for semiconductor, technology, and life sciences companies.

Lucy Yen is a partner in the New York office of Wilson Sonsini Goodrich & Rosati, where her practice focuses on intellectual property, antitrust, and complex commercial litigation. Lucy also advises clients on internet-related legal issues.

Lucy has extensive experience managing cases and taking them to trial, including complex cases for semiconductor, technology, and life sciences companies. She has played an active role in many jury and bench trials for the firm's clients. She has drafted pretrial submissions, argued pretrial motions, participated in jury studies and mock trials, prepared witnesses to testify, and cross-examined witnesses at trial. Lucy has obtained successful outcomes for numerous clients in both trials and arbitrations. For example, she recently participated in multiple arbitrations in the telecommunications sector, resulting in awards for her client of over $100 million.

Lucy sits on the board of directors of the Wilson Sonsini Foundation, and is a member of the firm's Associate Career Development Committee and Diversity and Inclusion Committee.

Born in Taipei, Taiwan, Lucy speaks fluent Mandarin Chinese.

Experience

Lucy sits on the board of directors of the Wilson Sonsini Foundation, and is a member of the firm's Associate Career Development Committee and Diversity and Inclusion Committee.

Born in Taipei, Taiwan, Lucy speaks fluent Mandarin Chinese.

Education

J.D., Boston College Law School, 2002Magna Cum Laude, Presidential Scholar
B.A., English and American Literature and Language, Harvard University, 1999Cum Laude

Honors

Named to New York Super Lawyers' "Rising Stars" list in 2011, 2012, and 2013

Admissions

Bar of the District of Columbia
State Bar of California
State Bar of New York
U.S. District Court for the Central District of California
U.S. District Court for the Northern District of California
U.S. District Court for the Southern District of New York

Credentials

Education

J.D., Boston College Law School, 2002Magna Cum Laude, Presidential Scholar
B.A., English and American Literature and Language, Harvard University, 1999Cum Laude

Honors

Named to New York Super Lawyers' "Rising Stars" list in 2011, 2012, and 2013

Admissions

Bar of the District of Columbia
State Bar of California
State Bar of New York
U.S. District Court for the Central District of California
U.S. District Court for the Northern District of California
U.S. District Court for the Southern District of New York

Recent Insights

Client Highlights

On March 5, 2026, Wilson Sonsini Goodrich & Rosati secured a complete jury victory in a patent invalidity trial in the U.S. District Court for the Northern District of California on behalf of firm client Cyntec Company, Ltd. Rejecting defendant Chilisin’s arguments on obviousness, the jury found that all asserted claims of Cyntec’s U.S. Patent Nos. 8,922,312 and 9,481,037 were valid. Wilson Sonsini also represented Cyntec in a previous jury trial which had found that Chilisin willfully infringed both patents and imposed a 5 percent royalty.

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Client Highlights

On June 10, 2025, Wilson Sonsini secured a complete defense verdict from a Los Angeles jury in ReactX LLC v. Google LLC. ReactX sought $1.3 billion in damages, alleging that Google breached a series of contracts by misusing ReactX’s confidential technology to build two of Google’s most successful digital advertising products. ReactX originally brought the case as one for trade secret misappropriation, but just two weeks before trial, it voluntarily dismissed its trade secret cause of action. The court further trimmed ReactX’s lawsuit in response to nonsuit motions brought by Wilson Sonsini, ruling that Google was bound by only one of the contracts asserted by ReactX and dismissing ReactX’s cause of action for breach of the implied covenant of good faith and fair dealing. After a six-week trial featuring 17 witnesses, the jury completely vindicated Google on ReactX’s remaining cause of action for breach of contract.

The Wilson Sonsini team representing Google in the matter was led by partners Colleen Bal, John Flynn, Tait Graves, Josh Baskin, and Lucy Yen, and included Andrew Alderette, Stephanie Cheng, Kayla Dessel, Katherine Ericson, Celine Liu, Sachli Nayeri, Courtney Reed, Matt Donohue, Doug Brockmeier, Sissel Browder, Shannon Hill, and Pamela Sandillo.

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