Company lists · Data refreshed September 2026

Top 25 Big six law firms based in Philadelphia, United States

Name: Big six law firms based in Philadelphia, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 108 companies tracked

RevenueBase identified 108 big six law firms headquartered in Philadelphia, United States as of September 2026 and tracks 22,264 professional contacts across them, including 12,075 with verified work emails. New York is the largest hub.

This list covers big six law firms headquartered in Philadelphia, 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 23, 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 23, 2026 86% judged on-target in blind review

108Companies

22,264Contacts tracked

12,075Verified emails

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The 25 largest big six law firms based in Philadelphia, United States

Ranked by team size

Top 25 of 108 big six law firms based in Philadelphia, United States, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big six law 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	Morgan, Lewis & Bockius LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	4,832 contacts →
	Partial evidence “From our offices in strategic hubs of commerce, law, and government across North America, Asia, Europe, and the Middle East, we work with clients ranging from established, global…” Source: RevenueBase Database · checked Sep 23, 2026
2	FOX Rothschild	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,139 contacts →
	Indirect evidence “With bold growth, Fox Rothschild brings together attorneys coast to coast.” Source: RevenueBase Database · checked Sep 23, 2026
3	Dechert LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,041 contacts →
	Partial evidence “Dechert is the law firm that helps business leaders lead.” Source: RevenueBase Database · checked Sep 23, 2026
4	Faegre Drinker	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,848 contacts →
	Indirect evidence “Faegre Drinker is a firm designed for clients.” Source: RevenueBase Database · checked Sep 23, 2026
5	Duane Morris LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,843 contacts →
	Partial evidence “Duane Morris LLP, a law firm with more than 900 attorneys in offices across the United States and internationally, is asked by a broad array of clients to provide innovative…” Source: RevenueBase Database · checked Sep 23, 2026
6	Ballard Spahr LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,682 contacts →
	Partial evidence “Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.” Source: RevenueBase Database · checked Sep 23, 2026
7	Saul Ewing LLP	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	501-1,000	916 contacts →
	Indirect evidence “Inspired People.” Source: RevenueBase Database · checked Sep 23, 2026
8	Stradley Ronon	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	447 contacts →
	Indirect evidence “Philadelphia Grown.” Source: RevenueBase Database · checked Sep 23, 2026
9	White And Williams LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	416 contacts →
	Partial evidence “Founded in 1899, White and Williams LLP is a global-reaching, multi-practice law firm with over 200 lawyers in ten offices.” Source: RevenueBase Database · checked Sep 23, 2026
10	Post & Schell, P.C	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	336 contacts →
	Indirect evidence “For over 50 years, Post & Schell’s attorneys have combined the operational knowledge and insight into the industries they represent with creative legal solutions – and helped…” Source: RevenueBase Database · checked Sep 23, 2026
11	Margolis Edelstein	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	277 contacts →
	Indirect evidence “Margolis Edelstein was founded in Philadelphia over 65 years ago.” Source: RevenueBase Database · checked Sep 23, 2026
12	Weber Gallagher	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	264 contacts →
	Indirect evidence “With more than 160 legal professionals, Weber Gallagher provides counsel to local, national and international businesses, insurance companies and financial institutions in…” Source: RevenueBase Database · checked Sep 23, 2026
13	Obermayer Rebmann Maxwell & Hippel LLP	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	242 contacts →
	Indirect evidence “With over 100 attorneys in offices throughout Pennsylvania, New Jersey, New York, Connecticut and Delaware, we provide businesses, organizations, and individuals with legal…” Source: RevenueBase Database · checked Sep 23, 2026
14	Dilworth Paxson LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	240 contacts →
	Partial evidence “Founded in 1933, Dilworth Paxson conducts a broad and diverse regional law practice representing a wide variety of clients ranging from Fortune 500 companies to closely-held…” Source: RevenueBase Database · checked Sep 23, 2026
15	Montgomery Mccracken Walker & Rhoads LLP	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	212 contacts →
	Indirect evidence “Montgomery McCracken’s collaborative approach – in all we do – delivers access to the right people at the right time, efficiencies in our work, and outcomes our clients need and…” Source: RevenueBase Database · checked Sep 23, 2026
16	Rawle & Henderson LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	204 contacts →
	Partial evidence “Rawle & Henderson, LLP, is a Mid-Atlantic regional law firm whose attorneys engage in civil trial litigation.” Source: RevenueBase Database · checked Sep 23, 2026
17	Klehr Harrison Harvey Branzburg LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	193 contacts →
	Partial evidence “Klehr Harrison Harvey Branzburg LLP is a dynamic law firm known in the business, financial and legal communities for its aggressive and creative problem-solving skills.” Source: RevenueBase Database · checked Sep 23, 2026
18	Zarwin Baum	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	133 contacts →
	Indirect evidence “Zarwin Baum DeVito Kaplan Schaer, P.C.” Source: RevenueBase Database · checked Sep 23, 2026
19	Mintzer Sarowitz Zeris & Willis Pllc	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	201-500	127 contacts →
	Indirect evidence “Mintzer Sarowitz Zeris & Willis PLLC is a partnership of experienced defense counsel committed to providing our clients with the highest level of representation and service.” Source: RevenueBase Database · checked Sep 23, 2026
20	Reger Rizzo & Darnall LLP	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	124 contacts →
	Indirect evidence “Reger Rizzo & Darnall LLP is a firm with a proven track record of success.” Source: RevenueBase Database · checked Sep 23, 2026
21	Volpe Koenig	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	103 contacts →
	Partial evidence “Volpe Koenig is a full-service intellectual property law firm providing worldwide client counseling on patents, trademarks, copyrights, trade secrets, technology transfers, due…” Source: RevenueBase Database · checked Sep 23, 2026
22	Hangley Aronchick Segal Pudlin & Schiller	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	102 contacts →
	Indirect evidence “When our firm was founded in 1994, our idea was to build a firm of lawyers with superior academic credentials and professional capabilities who wanted to develop their practices…” Source: RevenueBase Database · checked Sep 23, 2026
23	Spector Gadon Rosen Vinci P.C	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	102 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 23, 2026
24	Kleinbard LLC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	11-50	65 contacts →
	Indirect evidence “For over 75 years, Kleinbard attorneys have served as trusted advisors and advocates for clients to help them achieve their goals.” Source: RevenueBase Database · checked Sep 23, 2026
25	Panitch Schwarze Belisario & Nadel LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 23, 2026	51-200	57 contacts →
	Partial evidence “Panitch Schwarze Belisario & Nadel, LLP is an intellectual property boutique law firm that services clients internationally, with offices in Philadelphia, Wilmington, DE, and…” Source: RevenueBase Database · checked Sep 23, 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: big six law 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 big six law firms.
Partial evidence: Its own public description names part of big six law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big six law 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 108 big six law firms based in Philadelphia, United States

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Big six law firms based in Philadelphia, United States at a glance

As of Sep 23, 2026

54.2%Verified-email coverage

206.1Average contacts per company

11-50Median size (employees)

618.5%Largest-city concentration · New York

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Philadelphia, so it is reported there. Company counts and contact totals on this page are exact for Philadelphia, over 108 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 big six law 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 Philadelphia, United States whose own description of what they do matches “big six law 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 big six law 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 big six law firms, and records with no verified work email. Companies headquartered outside Philadelphia 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, 12,075 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 23, 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.

Big six law firms by metro in the United States

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 big six law 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 big six law firms are there based in Philadelphia, United States?

RevenueBase identified 108 big six law firms headquartered in Philadelphia, 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?

Morgan, Lewis & Bockius LLP, headquartered in Philadelphia, tops this list with the largest team on record.

Which city has the most big six law firms?

New York leads with 668 headquartered companies, followed by Chicago (344) and Los Angeles (340).

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 12,075 verified decision-maker contacts tracked across these 108 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 23, 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.