Company lists · Data refreshed September 2026

Top 25 International ip firms based in the United States

Name: International ip firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 2,167 companies tracked

RevenueBase identified 2,167 international ip firms headquartered in the United States as of September 2026 and tracks 39,254 professional contacts across them, including 22,223 with verified work emails. New York is the largest hub.

This list covers international ip firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

2,167Companies

39,254Contacts tracked

22,223Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest international ip firms based in the United States

Ranked by team size

Top 25 of 2,167 international ip firms based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to international ip firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Cooley LLP	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,341 contacts →
	Partial evidence “Clients partner with Cooley on transformative deals, complex IP and regulatory matters, and high-stakes litigation.” Source: RevenueBase Database · checked Sep 20, 2026
2	Perkins Coie	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,746 contacts →
	Indirect evidence “Perkins Coie has combined with Ashurst to form Ashurst Perkins Coie.” Source: RevenueBase Database · checked Sep 20, 2026
3	Crowell & Moring	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,602 contacts →
	Partial evidence “Crowell & Moring is an international law firm with operations in the United States, Europe, MENA, and Asia.” Source: RevenueBase Database · checked Sep 20, 2026
4	Fish & Richardson P.C	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,167 contacts →
	Indirect evidence “As the leading intellectual property law firm, we help innovators change the world through our unmatched litigation, prosecution, and post-grant experience across venues and…” Source: RevenueBase Database · checked Sep 20, 2026
5	Finnegan, Henderson, Farabow, Garrett & Dunner, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	501-1,000	936 contacts →
	Indirect evidence “When your most valuable assets are ideas, innovation, and brand-you need the best.” Source: RevenueBase Database · checked Sep 20, 2026
6	Maxval Group, INC	Partial evidence	Los Altos, CA, United StatesHQ checked Sep 20, 2026	501-1,000	754 contacts →
	Partial evidence “Since 2004, MaxVal has helped the world's most innovative organizations capitalize on their intellectual property by being different from the legacy IP solution providers.” Source: RevenueBase Database · checked Sep 20, 2026
7	Anaqua	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	501-1,000	686 contacts →
	Indirect evidence “Anaqua, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
8	Butler Snow LLP	Indirect evidence	Ridgeland, MS, United StatesHQ checked Sep 20, 2026	501-1,000	685 contacts →
	Indirect evidence “With over 400 attorneys in offices in Albuquerque, Ambler (PA), Atlanta, Austin, Baton Rouge, Bethlehem (PA), Birmingham, Boston, Charleston, Dallas, Denver, Gulfport, Huntsville…” Source: RevenueBase Database · checked Sep 20, 2026
9	Honigman LLP	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 20, 2026	501-1,000	669 contacts →
	Indirect evidence “Honigman LLP is an Am Law 200 full-service, general business law firm with more than 400 attorneys counseling clients on complex issues across the country in Chicago, Michigan…” Source: RevenueBase Database · checked Sep 20, 2026
10	Knobbe Martens	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 20, 2026	501-1,000	606 contacts →
	Indirect evidence “Knobbe Martens protects the ideas that drive innovation and propel our world forward.” Source: RevenueBase Database · checked Sep 20, 2026
11	Sagaciouselevate	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	488 contacts →
	Partial evidence “Sagacious IP is the World’s LARGEST IP research firm that reliably supports the worldwide IP community including Large Corporations, Small & Mid-size Corporations, IP law firms…” Source: RevenueBase Database · checked Sep 20, 2026
12	Tucker Ellis LLP	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 20, 2026	201-500	481 contacts →
	Indirect evidence “Tucker Ellis LLP is a full-service law firm of more than 240 lawyers serving clients from “11 Long Hallways” nationwide: Atlanta, Chicago, Cleveland, Columbus, Los Angeles…” Source: RevenueBase Database · checked Sep 20, 2026
13	Sterne, Kessler, Goldstein & FOX	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	468 contacts →
	Indirect evidence “Sterne, Kessler, Goldstein & Fox is a full-service intellectual property law firm that provides innovative solutions tailored to your business and industry.” Source: RevenueBase Database · checked Sep 20, 2026
14	Wolf Greenfield	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	201-500	428 contacts →
	Indirect evidence “Wolf, Greenfield & Sacks, P.C.” Source: RevenueBase Database · checked Sep 20, 2026
15	Sandberg Phoenix	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 20, 2026	201-500	387 contacts →
	Indirect evidence “Over 45 years providing superior legal services to clients of every size throughout the Midwest and across the country, Sandberg Phoenix is consistently rated as one of St.” Source: RevenueBase Database · checked Sep 20, 2026
16	Wiggin And Dana LLP	Indirect evidence	New Haven, CT, United StatesHQ checked Sep 20, 2026	201-500	366 contacts →
	Indirect evidence “Wiggin and Dana is a full-service law firm of highly talented, creative and experienced lawyers dedicated to exceeding our clients’ expectations every day.” Source: RevenueBase Database · checked Sep 20, 2026
17	Merchant & Gould P.C	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	201-500	317 contacts →
	Indirect evidence “An intellectual property law firm at the leading edge of patent, trademark and copyright law, licensing agreements, trade secret litigation, and more, expect a unique combination…” Source: RevenueBase Database · checked Sep 20, 2026
18	Howard & Howard Attorneys Pllc	Indirect evidence	Royal Oak, MI, United StatesHQ checked Sep 20, 2026	201-500	307 contacts →
	Indirect evidence “From our founding above a blacksmith shop in 1869 to the full-service law practice we’ve become in the 156 years since, we have consistently sought to earn each client’s trust by…” Source: RevenueBase Database · checked Sep 20, 2026
19	Banner Witcoff	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	288 contacts →
	Indirect evidence “For more than 100 years Banner Witcoff has provided sound protection and inventive intellectual property solutions for some of the world’s most innovative organizations.” Source: RevenueBase Database · checked Sep 20, 2026
20	Lathrop Gage	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 20, 2026	501-1,000	283 contacts →
	Indirect evidence “Lathrop Gage clients are the backbone of our economy.” Source: RevenueBase Database · checked Sep 20, 2026
21	Schwegman Lundberg & Woessner, P.A	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	201-500	275 contacts →
	Indirect evidence “SLW is a boutique law firm dedicated to protecting intellectual property.” Source: RevenueBase Database · checked Sep 20, 2026
22	Harness IP	Partial evidence	Bloomfield Hills, MI, United StatesHQ checked Sep 20, 2026	201-500	266 contacts →
	Partial evidence “Harness IP’s team of patent and trademark attorneys serve clients in all areas of intellectual property law.” Source: RevenueBase Database · checked Sep 20, 2026
23	Irell & Manella LLP	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	201-500	258 contacts →
	Partial evidence “Irell & Manella LLP is a law firm focused on complex commercial and IP litigation.” Source: RevenueBase Database · checked Sep 20, 2026
24	Effectual Services	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	242 contacts →
	Indirect evidence “Effectual Services is a well established and fast growing patent and legal support services company having experience and expertise in providing patent and legal services.” Source: RevenueBase Database · checked Sep 20, 2026
25	Cantor Colburn LLP	Partial evidence	Hartford, CT, United StatesHQ checked Sep 20, 2026	201-500	222 contacts →
	Partial evidence “Cantor Colburn LLP is one of the largest intellectual property specialty law firms in the country, providing clients worldwide with the complete range of IP legal services…” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: international ip firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names international ip firms.
Partial evidence: Its own public description names part of international ip firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name international ip firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 2,167 international ip firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 22,223 reachable decision-makers.

Free signup · no credit card

View the full list →

International ip firms based in the United States at a glance

As of Sep 20, 2026

56.6%Verified-email coverage

18.1Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,464

11-50

520

51-200

134

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,167 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among international ip firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “international ip firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names international ip firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among international ip firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 22,223 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

International ip firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names international ip firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many international ip firms are there based in the United States?

RevenueBase identified 2,167 international ip firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Cooley LLP, headquartered in Palo Alto, tops this list with the largest team on record.

Which city has the most international ip firms?

New York leads with 137 headquartered companies, followed by Washington (88) and Chicago (70).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 22,223 verified decision-maker contacts tracked across these 2,167 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,167 international ip firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

International ip firms by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.