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Demian Ahn
Partner
Demian Ahn is a member of the firm’s data, privacy, and cybersecurity practice based in Washington, D.C. He leads the firm’s incident response practice and advises companies on compliance, regulatory, and crisis management matters relating to emerging technologies of all kinds.
Josephine Aiello LeBeau
Partner
Josephine focuses on matters related to compliance and enforcement of U.S. export control and sanctions.
Ali R. Alemozafar
Partner
Ali counsels clients on patent strategy, prosecution, and diligence for financings, M&A, and IPOs.
Lester Ang
Partner
Lester Ang is a corporate and securities partner in the Palo Alto office of Wilson Sonsini, where he works with private and public technology and life sciences companies through all stages of their growth, as well as with venture capital firms and private equity firms.
Brian Appel
Partner
Brian Appel is a partner in the Palo Alto office of Wilson Sonsini Goodrich & Rosati, where he practices corporate and securities law. He advises companies on general corporate matters, including formation and operation, corporate governance, debt and equity financings, mergers and acquisitions, and securities-related matters. He has assisted early-stage companies in numerous capital-raising transactions, including venture capital financings.
Matthew A. Argenti
Partner
Matt is an experienced patent litigatior with an focus on post-grant review proceedings before the PTAB.
Hin Au
Partner
Hin Au is a partner in the Palo Alto office of Wilson Sonsini Goodrich & Rosati, where he is a member of the patents and innovations practice. Hin provides IP strategy and counseling services to clients in a wide range of technical fields, including MedTech, digital health, biotech, medical/diagnostic devices, software, robotics, autonomous vehicle technologies, and clean energy. He has assisted many clients with building their patent portfolios and securing key strategic patents. Hin has hands-on engineering industry experience, having previously worked as an R&D engineer for six years at large U.S. semiconductor corporations. A native of Singapore, Hin is also fluent in Mandarin and Cantonese.
Christine K. Au-Yeung
Partner
Christine Au-Yeung is a partner in the San Francisco and Palo Alto offices of Wilson Sonsini Goodrich & Rosati, where she focuses on trademark, copyright, and advertising law. She counsels clients on all aspects of brand protection in the U.S. and throughout the world, including clearance and selection of trademarks, prosecution of trademark applications, licensing, and the resolution of trademark infringement and domain name disputes. She also advises clients on advertising issues, including TCPA compliance related to marketing calls and texts, as well as strategies on promotions such as sweepstakes and contests.
Colleen Bal
Partner
Colleen is a nationally recognized trial lawyer with a proven track record of handling difficult and high-profile cases for leading technology, life sciences, and financial companies.
Services (114)
Insights (5030)
Alerts
10.21.26
California OHCA Finalizes AB 1415 Regulations: Key Takeaways for Private Equity, Venture Capital, and MSO Transactions
California’s Office of Health Care Affordability (OHCA) has finalized regulations implementing Assembly Bill 1415 (AB 1415), providing additional guidance regarding the application of California’s healthcare transaction notice requirements to private equity groups, hedge funds, management services organizations (MSOs), and other entities involved in healthcare transactions. The final regulations become effective November 2, 2026.
Alerts
10.21.26
Subscriptions in the Spotlight: UK CMA Prepares for New Consumer Protection Regime
On October 19, 2026, the UK government published draft guidance on the country’s new consumer subscription contracts regime. This regime, which is set to come into force on January 1, 2027, will introduce new requirements for traders to provide transparent information to consumers, deliver renewal reminders, provide simple cancellation mechanisms, and respect cooling-off rights. The government also previously announced that it will consult on whether certain pricing practices, including “fake” discounts, should be added to the UK’s list of banned commercial practices, with the aim of facilitating effective enforcement action.
Client Highlights
10.21.26
Wilson Sonsini Advises ElevenLabs on $300 Million Employee Tender Offer
On September 30, 2026, ElevenLabs, a voice technology research company, announced the closing of a $300 million employee tender offer that values the company at $22 billion, doubling its valuation at its Series D financing in February 2026. The tender offer was led by Wellington and T. Rowe Price, with participation from new investors BDT & MSD, EQT, GIC, Goldman Sachs, OTPP, and Sapphire Ventures, as well as existing investors including Alkeon, Andreessen Horowitz, D.E. Shaw, DISRUPTIVE, Evantic, ICONIQ, and Lightspeed. Wilson Sonsini Goodrich & Rosati advised Elevenlabs on the transaction.
Client Highlights
10.21.26
Wilson Sonsini Advises Tenstorrent on $1.5 Billion Series E Financing
On October 19, 2026, Tenstorrent, an artificial intelligence (AI) computing company, announced it has closed $1.5 billion in Series E funding at a $6.2 billion post-money valuation. The round was led by Trace Capital and Innovation X, with participation from new and existing investors including Agostinelli Group, ARK Invest, Brett Barna, Cadence Ventures, Eclipse, Fidelity Management & Research Company, Maverick Silicon, Morgan Stanley, Protagonist, Sandisk, T. Rowe Price, Tether Investments, Troluce Capital, Virtu Financial, and XTX Markets. Wilson Sonsini Goodrich & Rosati represented Tenstorrent on the transaction.
News Articles
10.21.26
Wilson Sonsini Recognized in the 2026 Law360 Pulse Leaderboard
Wilson Sonsini has been recognized in the 2026 Law360 Pulse Leaderboard, which evaluates law firms across three pillars: prestige, platform strength, and practice footprint. Now in its sixth year, the annual ranking reflects the evolving factors that define success in an increasingly competitive legal market.
Blog Posts
10.20.26
Corp Fin Issues New and Revised CFIs on Use of Form S-8, Rule 701, and Form 4 Deadlines
The SEC’s Division of Corporation Finance recently published six new and two revised Corporation Finance Interpretations (CFIs) addressing the registration of stock underlying equity compensation awards and benefit plans. Collectively, the CFIs ease several longstanding staff positions on the timing of Form S-8 registration for restricted stock and restricted stock units, the treatment of awards assumed from acquired companies, and awards granted prior to an initial public offering.
Client Highlights
10.20.26
Firm Advises Clearway on Agreements with PacifiCorp for Additional 210 MW of Battery Energy Storage in Utah
On October 9, 2026, Clearway Energy Group (Clearway) announced an additional 210 megawatts (MW) of battery energy storage to its Honeycomb Energy Center fleet in southern Utah, supported by long-term contracts with PacifiCorp. The new storage capacity will help balance supply and demand on Utah’s electrical grid. Wilson Sonsini Goodrich & Rosati advised Clearway on the transaction with PacifiCorp.
News Articles
10.19.26
2027 Lawdragon 500 Leading Dealmakers in America Recognizes Wilson Sonsini Attorneys
On October 16, 2026, Lawdragon published the seventh edition of its Leading Dealmakers in America guide, honoring the lawyers who embody excellence in transactional work. The list was compiled through Lawdragon’s time-honed methodology, including independent journalistic research, nominations, and peer review.
Events (1945)
Speaking Engagements
12.08.26
PLI's Tax Strategies for Corporate Acquisitions, Dispositions, Spin-Offs, Joint Ventures, Financings, Reorganizations & Restructurings 2026
Practising Law Institute (PLI) features specialized sessions on tax strategies for financially troubled businesses within its premier annual conference series on Tax Strategies for Corporate Acquisitions, Dispositions, Spin-Offs, Joint Ventures, Financings, Reorganizations & Restructurings. These programs focus on navigating net operating losses (NOLs), debt restructurings, and corporate distress under complex federal tax rules.
Affiliated Programs
12.03.26
Demystifying Biopharma Business Development: Understanding the Process and Thriving as a BD Professional
This full-day workshop will be taught by accomplished business development (BD) professionals with deep experience in both large pharmas and small biotechs, providing perspectives from both sides of the table for biopartnering. If you have ever wondered what BD is, how to work efficiently and effectively with your BD team to advance your company’s strategy and programs, or even how to become a BD professional yourself, this is a good workshop for you (and your colleagues in R&D, regulatory, legal, finance, and even executive positions) to attend. The workshop will include presentations, case studies, and group exercises, and conclude with a panel discussion.
Speaking Engagements
Tuesday, December 1, 2026
Informa Connect's CompLaw: Pharma 2026
Wilson Sonsini Of Counsel Andrew Morrison joins the "Product Bundling: Competition Law Concerns" panel at CompLaw: Pharma, hosted by Informa Connect. Andrew is joined by Luca Arnaudo, Senior Officer at the Italian Competition Authority, and Andrea Bazzotti, European Legal Counsel at Ultragenyx Europe GmbH.
Affiliated Programs
Tuesday, December 1, 2026
The Competition Law & Artificial Intelligence Summit 2026, ThoughtLeaders4
Wilson Sonsini partner Jindrich Kloub is moderating the "Insights from EU Member State Regulators" session at The Competition Law & Artificial Intelligence Summit, hosted by ThoughtLeaders4. Jindrich is joined by Yann Guthmann, Head of the Digital Economy Unit at Autorité de la concurrence.
Speaking Engagements
Monday, November 23, 2026
PLI's Twenty-Fourth Annual Directors' Institute on Corporate Governance
Boards must navigate a fast-changing environment that now spans corporate governance, shareholder activism, fiduciary duties, legal and business risk oversight, privacy, cybersecurity, AI governance, and criminal and regulatory enforcement. At this program, leading corporate governance experts, including directors, government officials, corporate counsel, and consultants, will share practical perspectives on the issues shaping board oversight today: the 2026 proxy season and evolving activist strategies, corporate law developments, emerging technology risks, enforcement priorities, and the topics that keep directors up at night.
Speaking Engagements
Thursday, November 19, 2026
2026 ABA Antitrust Global Seminar Series: Tokyo
Brent Snyder, head of the firm's regulatory and compliance department, is moderating the "Cartel Enforcement Reinvigorated—Leniency, Whistleblowers & Cross Border Coordination" panel at the ABA Antitrust Law Section's Antitrust Global Seminar Series: Tokyo, joined by fellow panelists from private practice across the Asia-Pacific region.
Speaking Engagements
Tuesday, November 17, 2026
Slush 2027 Fringe Roundtable: What Does It Take to Expand in the U.S.?
Founders ask, experts answer! Join our panel at a candid roundtable luncheon where entrepreneurs can bring their questions about raising U.S. capital, data, hiring, and connections, directly to the people who can honestly answer them. No vendor pitches, nor sales decks ... just a community that supports founders on their journey westward.