Fenwick & West LLP
About Fenwick & West LLP
Fenwick & West LLP, now known as Fenwick, is a law firm. William Fenwick formed it in 1972 with three partners. Its headquarters are in Mountain View, California. It has offices in Silicon Valley, San Francisco, Seattle, New York City, Santa Monica, Washington, DC and Boston.
The firm focuses on technology and life sciences and advises clients from startups to public companies. Its practice areas include venture capital, capital markets, mergers and acquisitions, patents and commercial litigation. Chambers describes its venture capital practice as noted for work in gaming, cryptocurrency, digital health, fintech and artificial intelligence. Fenwick says its clients include more than 1,500 VC-backed companies.
Founders should know this is a firm and not a person. Its investments are made by the firm, usually alongside other investors. The sources reviewed name no individual partner as the decision maker.
CB Insights lists 15 investments by Fenwick, with the most recent dated March 2024. The listed rounds are seed and later-stage rounds in which the firm participated alongside venture funds, angels and other law firms. Fenwick has not published details on how it selects investments or how large its stakes are.
On the Lounge deals desk, Fenwick appears in Advocacy's $3.5M seed round from March 2026. Business Wire reports that Relentless led the round. Relativity, through its innovation arm Rel Labs, also took part, as did legal scholars from T14 law schools and other law firms. Business Wire describes Advocacy as an AI-native, context-first litigation workspace, and the release calls Fenwick an Am Law 100 firm. The company says it will use the funds to expand its product and engineering teams and deepen its partnership with Relativity.
Public information on the firm's investments points to early-stage technology companies, including legal technology and AI. Its published investments are small in number and the firm gives no stage thesis. No check size, fund size or stated investment criteria are public.
Fenwick's venture capital services group also makes introductions between its clients and investors. Before sending introductions, it works with clients to refine their business strategy and investor materials. Founders who are already Fenwick clients may encounter the firm this way.
- Advocacy: AI-native litigation workspace based in San Francisco. Fenwick took part in its $3.5M seed round announced in March 2026.
- SingleFile: listed by CB Insights as a Fenwick investment in a $5.5M seed round dated March 2024.
- Slice: listed by CB Insights as a Fenwick investment in a $7M seed round dated February 2024.
- en.wikipedia.org/wiki/Fenwick_&_West
- cbinsights.com/investor/fenwick-west-1
- businesswire.com/news/home/20260306028182/en/Context-Driven-Litigation
- finsmes.com/2026/03/advocacy-raises-3-5m-in-seed-funding.html
- fenwick.com/services/practices/startup-venture-capital
- chambers.com/department/fenwick-west-llp-venture-capital-usa-5:2813:12
Investing activity
Fenwick & West LLP appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $4M. The most recent is Advocacy (Seed, $3.5M, Mar 2026).
Fenwick & West LLP most often invests alongside Relentless and Relativity, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Fenwick & West LLP
Is Fenwick & West LLP an angel investor?
Fenwick & West is a law firm that has also made investments in startups. CB Insights lists 15 of them. It is not an individual angel, and the sources reviewed name no partner who leads its investing.
What AI companies has Fenwick & West invested in?
Fenwick & West took part in Advocacy's $3.5M seed round in March 2026. Advocacy builds an AI-native litigation workspace. No other AI investments by the firm were confirmed in the sources reviewed.
What check size does Fenwick & West write?
Fenwick has not made its check size public. Round totals in CB Insights data show the size of the whole round, not the firm's own stake.
What stage does Fenwick & West invest in?
The investments it has disclosed are mostly seed rounds, including Advocacy in 2026 and SingleFile and Slice in 2024. CB Insights also lists a Series F in Invoca (2022). The firm has not published a stage focus.
How can founders get introduced to Fenwick & West?
Fenwick runs a Venture Capital Services group that introduces clients to investors. The firm's website describes it as working with clients on strategy and investor materials before making introductions. Founders can reach the firm through fenwick.com.
What AI companies has Fenwick & West LLP invested in?
Fenwick & West LLP's AI investments include Advocacy. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Fenwick & West LLP invest at?
In the rounds tracked on Lounge, Fenwick & West LLP has invested at Seed, with a median round of $4M.
Who does Fenwick & West LLP co-invest with?
Fenwick & West LLP's most frequent co-investors on Lounge are Relentless (1 deal) and Relativity (1 deal).
How can founders reach Fenwick & West LLP?
Founders on Lounge can see Fenwick & West LLP's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with them under Warm Paths, and add Fenwick & West LLP to their Investor Pipeline to track the conversation.