Wilson Sonsini

About Wilson Sonsini

Wilson Sonsini Goodrich & Rosati, usually shortened to Wilson Sonsini, is a law firm closely tied to the technology industry. Its headquarters and largest office is at 650 Page Mill Road in Palo Alto, with the main phone number 650-493-9300. Some older map listings place the firm at 601 South California Avenue, so use the Page Mill Road address from the firm's own site. The firm's careers site describes the headquarters as an integral part of the fabric of the tech economy.

The firm says it has represented technology pioneers for more than 60 years. In its own words, its history closely traces the birth and evolution of Silicon Valley. The Palo Alto office describes itself as having been founded before the term "Silicon Valley" existed and as the center of gravity for the firm's teams.

Wilson Sonsini lists 17 offices and more than 1,100 attorneys. Besides Palo Alto, its offices include Austin, Boston, Boulder, Century City, Los Angeles, New York, Salt Lake City, San Diego, San Francisco, Seattle, Washington, D.C. and Wilmington, Delaware, plus Brussels, London, Hong Kong and Shanghai.

This page describes the firm and its Palo Alto office. It is not legal advice. It does not describe or evaluate any case or client result.

Practice focus

The firm lists six core practice areas:

• Corporate
• Intellectual property
• Litigation
• Patents and innovations
• Regulatory
• Technology transactions

Within those, it names more specialized groups such as capital markets; data, privacy and cybersecurity; employee benefits and compensation; mergers and acquisitions; and tax. The Palo Alto office alone lists 44 practice areas, from patent litigation and securities litigation to emerging companies and venture capital. Industry groups include biotech, life sciences, medical devices, semiconductors and software.

That spread runs from the formation and first financing of a startup through to patent fights and securities cases involving public companies. For a sense of how the startup side of that work fits the local scene, see our startups hub.

The Palo Alto office

The firm has been in its Page Mill Road building for a long time. According to The Real Deal, Wilson Sonsini has occupied 650 Page Mill Road since 1994, the year the two-story, 190,000-square-foot building in Stanford Research Park was completed. In 2022 the firm renewed its lease with the owner, CommonWealth Partners, through 2039. The same report described Wilson Sonsini as the Bay Area's largest law firm by headcount.

As of April 1, 2026, the firm says its Palo Alto office had more than 250 attorneys and more than 270 other employees. The office also hosts the firm's Summer Associate Academy, which brings 35 to 40 law student summer associates into its teams each year. Firm wide, Wilson Sonsini reports more than 80,500 pro bono hours in fiscal year 2025.

The firm's story runs alongside the growth of the local technology economy. Our Silicon Valley history page tells that broader story. Our venture capital guide covers the investors on the other side of many startup financings.

Who the firm works with

Wilson Sonsini's practice list points to business clients. Its emerging companies and venture capital practice is aimed at founders and young companies, while its litigation, regulatory and intellectual property groups handle the needs of larger businesses. It is not a firm for personal matters such as wills or family law. For those, look for a local practice that lists the area you need.

Founders preparing to raise money may find our guides to term sheet basics and accelerators and incubators useful before a first meeting with any law firm.

Getting in touch and visiting

Call 650-493-9300 or contact a lawyer through the firm's website. Arrange meetings in advance rather than dropping in. The Page Mill Road office is near the California Avenue district. The California Avenue Caltrain station is within walking distance, which helps visitors coming from San Francisco or San Jose. Drivers should check visitor parking arrangements with their contact at the firm. The restaurants and cafes of the California Avenue district are close by for a meal before or after a meeting. You can confirm any California attorney's license status through the State Bar of California's public attorney search.

Location and getting there

Wilson Sonsini is at 650 Page Mill Road, Palo Alto, CA 94304-1050, in the California Avenue area of Palo Alto. Our California Avenue guide covers what else is around.

The nearest train stop is the California Avenue Caltrain station, about 0.5 miles away. That is roughly a 14 minute walk.

Parking: street spaces and city garages with posted limits (see parking in Palo Alto).

What is nearby

• BMO Palo Alto, service business, 0.2 mi
• Fambrini's Cafe, cafe, 0.2 mi
• First Tech Federal Credit Union, Palo Alto, service business, 0.2 mi
• Chipotle El Camino and Page Mill, quick-service spot, 0.2 mi
• Sleep Number, store, 0.2 mi
• College Terrace Library, 0.2 mi
• Weisshaar Park, 0.4 mi
• Werry Park, 0.5 mi

Other professional services nearby: Haynes Boone (0.2 mi); WilmerHale (0.2 mi); Paul Hastings (0.2 mi); Candice Kistner - State Farm (0.3 mi). Browse the full professional services list.

Before you go

• Most firms meet by appointment only. Call or email before visiting the office.
• Ask about fees, billing and what is included before you sign an engagement letter.
• Check professional licenses through the relevant California board, such as the State Bar or the Department of Real Estate.

About this listing

Checked October 29, 2026 against Official website; Palo Alto office (careers site). How our listings work. Map data © OpenStreetMap contributors.

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