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Top 30 professional services firms in Philadelphia

Tamtam tracks 72 professional services firms headquartered in Philadelphia. This list ranks the 30 largest by number of employees on LinkedIn, led by Aramark, Morgan, Lewis & Bockius LLP and Korn Ferry Hay Group. Their median headcount is 1,395. Half of them were founded in 1954 or later.

馃嚭馃嚫 Philadelphia30 companiesUpdated Nov 12, 2026

This selection of large professional services firms in Philadelphia shows a strong concentration in legal practices, alongside hospitality and specialized consulting. Companies like Aramark offer global hospitality and facilities management, while Morgan, Lewis & Bockius LLP provides comprehensive legal services. Korn Ferry Hay Group specializes in organizational consulting, and Day & Zimmermann focuses on construction, engineering, and staffing solutions. HHM Hotels manages a portfolio of hotels across North America.

A notable pattern among these firms is their long-standing presence, with many founded in the late 19th or early 20th century. Examples include Morgan, Lewis & Bockius LLP (1873), Day & Zimmermann (1901), and Fox Rothschild (1907), indicating a deep-rooted history of professional services in the city.

#CompanyIndustryHeadquarters EmployeesFounded
1
Aramarkaramark.com

Global hospitality service provider delivering food and facilities management to educational institutions, healthcare providers, sports teams, and municipalities across sixteen countries worldwide.

Hospitality 馃嚭馃嚫 Philadelphia 56,723 1939
2
Morgan, Lewis & Bockius LLPmorganlewis.com

Legal professionals providing corporate, transactional, litigation, and regulatory services to diverse industries worldwide, supporting clients' immediate and long-term goals.

Law Practice 馃嚭馃嚫 Philadelphia 5,068 1873
3
Korn Ferry Hay Groupkornferry.com

Global organizational consulting firm helping companies design their structure, roles, compensation, and hire talent to execute strategy in over 50 countries

Management Consulting 馃嚭馃嚫 Philadelphia 4,258 1943
4
Day & Zimmermanndayzim.com

Global company specializing in construction, engineering, operations, maintenance, staffing, and security services with extensive experience and worldwide presence.

Construction 馃嚭馃嚫 Philadelphia 4,211 1901
5
HHM Hotelshhmhotels.com

A leading hotel operator managing a portfolio of 240 hotels in the United States and Canada, known for delivering consistent results and focusing on people, processes, and technology

Hospitality 馃嚭馃嚫 Philadelphia 2,716 n/a
6
Fox Rothschildfoxrothschild.com

A national law firm with 1,000 attorneys providing personalized legal solutions, prioritizing innovation, and building lasting relationships based on trust and success

Law Practice 馃嚭馃嚫 Philadelphia 2,241 1907
7
Cozen O'Connorlinktr.ee

A top-ranked law firm with 825+ attorneys in 31 cities globally, specializing in litigation, business law, and government relations for diverse clients

Law Practice 馃嚭馃嚫 Philadelphia 2,150 1970
8
Dechert LLPdechert.com

Provides legal advice on litigation, transactions, and regulatory matters across financial services, private capital, real estate, life sciences, and technology sectors.

Law Practice 馃嚭馃嚫 Philadelphia 2,145 1875
9
Yoh, A Day & Zimmermann Companyyoh.com

Yoh specializes in fulfilling talent demands across various industries, offering expertise in IT, Fintech, Cybersecurity, Healthcare, and more with a focus on thought leadership and local support

Staffing and Recruiting 馃嚭馃嚫 Philadelphia 2,059 1940
10
Ballard Spahr LLPballardspahr.com

Provides litigation, transactional, and regulatory legal services to diverse clients, leveraging technology for efficiency and strategic counsel.

Law Practice 馃嚭馃嚫 Philadelphia 1,990 1885
11
Duane Morris LLPduanemorris.com

Provides innovative legal solutions globally with over 900 attorneys, emphasizing partnership, inclusiveness, and consensus in addressing client challenges.

Law Practice 馃嚭馃嚫 Philadelphia 1,952 1904
12
Blank Rome LLPblankrome.com

An Am Law 100 firm with 15 offices and 700 attorneys providing legal services worldwide, known for industry expertise and commitment to pro bono work

Law Practice 馃嚭馃嚫 Philadelphia 1,749 1946
13
FCAfcarchitects.com

Full-service architectural and design firm creating resonant spaces for clients, incorporating collaboration, enhancing lives, and promoting environmental responsibility through defined, rigorous processes

Architecture and Planning 馃嚭馃嚫 Philadelphia 1,604 1954
14
CMI Media Groupcmimediagroup.com

A full-service media agency specializing in health, wellness, and pharmaceutical marketing Offering audience strategy, data analytics, buying, and direct response services

Advertising Services 馃嚭馃嚫 Philadelphia 1,599 1989
15
ESIS, Inc.esis.com

Provider of risk management services including claims management, pre- and post-loss services, and integrated absence management, backed by a global insurance leader

Insurance 馃嚭馃嚫 Philadelphia 1,395 1953

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16
Pennonipennoni.com

The firm partners with clients to deliver innovative, sustainable, and resilient engineering solutions, fostering long-term relationships focused on community impact

Engineering Services 馃嚭馃嚫 Philadelphia 1,317 1966
17
Marshall Denneheymarshalldennehey.com

A leading civil defense litigation law firm with 500 attorneys across 19 offices, specializing in various practice areas including professional liability, healthcare, and workers' compensation

Law Practice 馃嚭馃嚫 Philadelphia 1,261 1962
18
Saul Ewing LLPsaul.com

A national law firm with 400 attorneys and top business professionals delivering practical advice, excellent service, and innovative solutions to clients globally

Law Practice 馃嚭馃嚫 Philadelphia 1,090 1921
19
Digitas Healthdigitashealth.com

Global connected health agency specializing in bringing health brands and humans closer through data, instinct, empathy, and creativity within Publicis Healthcare Communications Group.

Advertising Services 馃嚭馃嚫 Philadelphia 913 1990
20
Pacer Groupthepacer.com

Global staffing firm providing customized solutions for Fortune 500 clients, with a focus on diversity and veteran hiring, supported by advanced technology

Staffing and Recruiting 馃嚭馃嚫 Philadelphia 867 2008
21
True Searchtrueplatform.com

Global executive recruitment specializing in board members, c-suite executives, VPs, and directors for investment firms, portfolio companies, and public companies Dedicated to diversity and inclusion

Staffing and Recruiting 馃嚭馃嚫 Philadelphia 867 2012
22
PFMpfm.com

Financial advisors and consultants provide tailored financial advice, creative consultation, and strategic forecasting to empower clients and ensure sustainable outcomes.

Financial Services 馃嚭馃嚫 Philadelphia 823 1975
23
Your Part-Time Controller, LLCyptc.com

A growing company specializing in nonprofit accounting, recognized for its strong relationships, diverse expertise, and commitment to building stronger nonprofits

Accounting 馃嚭馃嚫 Philadelphia 805 1993
24
Turnberry Solutionsturnberrysolutions.com

Business and technology consulting firm delivering tailored solutions, premium talent, and innovative platforms for sustainable, meaningful growth and execution.

Business Consulting and Services 馃嚭馃嚫 Philadelphia 784 2001
25
Drinker Biddle & Reath LLP

The company is a merger between Drinker Biddle & Reath and Faegre Baker Daniels, now operating as Faegre Drinker as of February 1, 2020

Legal Services 馃嚭馃嚫 Philadelphia 714 1849
26
DSG Globaldsgco.com

A global executive search firm with diverse, inclusive, and transformational leadership recruitment practices, operating nationwide with deep industry expertise

Business Consulting and Services 馃嚭馃嚫 Philadelphia 652 1975
27
Magna Legal Servicesmagnals.com

End-to-end legal support services nationwide, offering court reporting, document consulting, E-Discovery solutions, and trial consulting to enhance legal proceedings effectively

Legal Services 馃嚭馃嚫 Philadelphia 591 2007
28
Defender Association of Philadelphiaphillydefenders.org

A nonprofit law firm in Philadelphia providing legal representation, social services, and reentry support to adults and juveniles, advocating for vulnerable populations and fair justice

Law Practice 馃嚭馃嚫 Philadelphia 582 1934
29
Richardson Sales Performancerichardson.com

Empowering sales teams worldwide with adaptable content, useful technology, and actionable metrics to drive real change and achieve better results

Professional Training and Coaching 馃嚭馃嚫 Philadelphia 561 n/a
30
PROSUL - Projetos, Supervis茫o e Planejamento Ltda.prosul.com

Specializing in consultancy engineering services with over 30 years of experience, focusing on infrastructure projects with a commitment to quality, sustainability, health, and safety

Civil Engineering 馃嚭馃嚫 Philadelphia 559 1987

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How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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