Company lists · Data refreshed September 2026

Top 25 Ip portfolio management firms based in New York, United States

RevenueBase identified 65 ip portfolio management firms headquartered in New York, United States as of September 2026 and tracks 1,385 professional contacts across them, including 664 with verified work emails. New York is the largest hub.

This list covers ip portfolio management firms headquartered in New York, 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
65Companies
1,385Contacts tracked
664Verified emails
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The 25 largest ip portfolio management firms based in New York, United States

Ranked by team size
Top 25 of 65 ip portfolio management firms based in New York, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to ip portfolio management 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-200182 contacts →

Partial evidence

“Fross Zelnick is consistently recognized by clients and peers as one of the top IP law firms in the world.”

Source: RevenueBase Database · checked Sep 20, 2026
2Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-200140 contacts →

Indirect evidence

“Desmarais LLP is a leading intellectual property litigation firm with offices in New York, San Francisco, and Washington, D.C.”

Source: RevenueBase Database · checked Sep 20, 2026
3Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-200135 contacts →

Partial evidence

“As an enterprise grows, its need for intellectual property (IP) protection expands.”

Source: RevenueBase Database · checked Sep 20, 2026
4Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 2026n/a117 contacts →

Indirect evidence

“Kenyon & Kenyon LLP is a leading intellectual property law firm whose sophisticated and business-oriented approach helps clients succeed with their intellectual property…”

Source: RevenueBase Database · checked Sep 20, 2026
5Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-200100 contacts →

Indirect evidence

“HG Law LLP (formerly Haley Guiliano LLP) is an international intellectual property law firm specializing in patent law from offices in London, New York and Silicon Valley.”

Source: RevenueBase Database · checked Sep 20, 2026
6Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-20090 contacts →

Partial evidence

“For IP Leaders by IP Professionals: Decades of experience in serving Fortune 500 Corporations & Leading Law Firms.”

Source: RevenueBase Database · checked Sep 20, 2026
7Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-20085 contacts →

Indirect evidence

“Since 1953, Amster, Rothstein & Ebenstein LLP has focused exclusively on representing clients in all facets of intellectual property law both domestically and internationally.”

Source: RevenueBase Database · checked Sep 20, 2026
8Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 2026n/a64 contacts →

Partial evidence

“A trusted partner in IP Value Capture + Creation.”

Source: RevenueBase Database · checked Sep 20, 2026
9Partial evidenceNew York, United StatesHQ checked Sep 20, 202611-5047 contacts →

Partial evidence

“Copperpod IP provides technical analysis services for patent litigation and licensing.”

Source: RevenueBase Database · checked Sep 20, 2026
10Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5034 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 20, 2026
11Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5028 contacts →

Indirect evidence

“Lucas & Mercanti is an intellectual property law firm.”

Source: RevenueBase Database · checked Sep 20, 2026
12Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202651-20026 contacts →

Indirect evidence

“Ostrolenk Faber is a premier intellectual property boutique law firm.”

Source: RevenueBase Database · checked Sep 20, 2026
13Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5023 contacts →

Indirect evidence

“Epstein Drangel LLP is a leading intellectual property law firm.”

Source: RevenueBase Database · checked Sep 20, 2026
14Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5018 contacts →

Indirect evidence

“Hilco Streambank is the leading appraisal and disposition services provider whose exclusive focus is intangible assets.”

Source: RevenueBase Database · checked Sep 20, 2026
15Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5017 contacts →

Partial evidence

“Large publicly traded companies and cutting-edge startups trust Gish PLLC to handle their most intricate IP matters.”

Source: RevenueBase Database · checked Sep 20, 2026
16Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-5012 contacts →

Partial evidence

“Fay Kaplun & Marcin, LLP specializes in Intellectual Property (IP) Law, assisting clients with identifying, analyzing and protecting IP, including patents, trademarks, copyrights…”

Source: RevenueBase Database · checked Sep 20, 2026
17Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-509 contacts →

Indirect evidence

“LGC is a New York City-based boutique law firm specializing in intellectual property litigation, prosecution, and related business and technology matters.”

Source: RevenueBase Database · checked Sep 20, 2026
18Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-108 contacts →

Indirect evidence

“Radulescu LLP is a patent litigation firm that specializes in cases where a deep understanding of the interplay between technology and legal issues is critical to a company’s…”

Source: RevenueBase Database · checked Sep 20, 2026
19Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-107 contacts →

Indirect evidence

“Sisun Law, PLLC offers legal services in the fields of trademark, copyright, and patent law.”

Source: RevenueBase Database · checked Sep 20, 2026
20Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-106 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 20, 2026
21Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 2026501-1,0006 contacts →

Partial evidence

“RWS inovia is the world’s leading expert in IP translations, foreign patent filing and patent search services.”

Source: RevenueBase Database · checked Sep 20, 2026
22Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 202611-505 contacts →

Indirect evidence

“Mauriel Kapouytian Woods LLP (MKW) was a boutique intellectual property law firm operating for nearly 17 years until its 2024 merger with Maschoff Brennan to form Maschoff Brennan…”

Source: RevenueBase Database · checked Sep 20, 2026
23Indirect evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-103 contacts →

Indirect evidence

“Boutique intellectual property litigation and consulting firm with offices in New York City and Seattle.”

Source: RevenueBase Database · checked Sep 20, 2026
24Strong evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-102 contacts →

Strong evidence

“We rigorously protect global trademark portfolios, enforce and defend trademarks and copyrights, and negotiate complex IP agreements for the world’s leading brands, innovators and…”

Source: RevenueBase Database · checked Sep 20, 2026
25Partial evidenceNew York, NY, United StatesHQ checked Sep 20, 20261-102 contacts →

Partial evidence

“Advisory and Capital for IP Owners and Investors”

Source: RevenueBase Database · checked Sep 20, 2026

Showing 25 of 65 ip portfolio management firms based in New York, United States

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Ip portfolio management firms based in New York, United States at a glance

As of Sep 20, 2026
47.9%Verified-email coverage
21.3Average contacts per company
1-10Median size (employees)
100.0%Largest-city concentration · New York
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
40
11-50
14
51-200
10
501-1,000
1

Email recency for this list is measured across the whole United States list rather than for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 65 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 ip portfolio management 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 New York, United States whose own description of what they do matches “ip portfolio management 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 ip portfolio management 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 ip portfolio management firms, and records with no verified work email. Companies headquartered outside New York 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, 664 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.

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 ip portfolio management 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 ip portfolio management firms are there based in New York, United States?

RevenueBase identified 65 ip portfolio management firms headquartered in New York, 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?

Fross Zelnick Lehrman & Zissu, headquartered in New York, tops this list with the largest team on record.

Which city has the most ip portfolio management firms?

New York leads with 65 headquartered companies, followed by Washington (55) and Chicago (49).

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 664 verified decision-maker contacts tracked across these 65 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.

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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.