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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 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. |
56,723 | |||
| 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. |
5,068 | |||
| 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 |
4,258 | |||
| 4 |
Day & Zimmermanndayzim.com
Global company specializing in construction, engineering, operations, maintenance, staffing, and security services with extensive experience and worldwide presence. |
4,211 | |||
| 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 |
2,716 | |||
| 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 |
2,241 | |||
| 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 |
2,150 | |||
| 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. |
2,145 | |||
| 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 |
2,059 | |||
| 10 |
Ballard Spahr LLPballardspahr.com
Provides litigation, transactional, and regulatory legal services to diverse clients, leveraging technology for efficiency and strategic counsel. |
1,990 | |||
| 11 |
Duane Morris LLPduanemorris.com
Provides innovative legal solutions globally with over 900 attorneys, emphasizing partnership, inclusiveness, and consensus in addressing client challenges. |
1,952 | |||
| 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 |
1,749 | |||
| 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 |
1,604 | |||
| 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 |
1,599 | |||
| 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 |
1,395 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Pennonipennoni.com
The firm partners with clients to deliver innovative, sustainable, and resilient engineering solutions, fostering long-term relationships focused on community impact |
1,317 | |||
| 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 |
1,261 | |||
| 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 |
1,090 | |||
| 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. |
913 | |||
| 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 |
867 | |||
| 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 |
867 | |||
| 22 | 823 | ||||
| 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 |
805 | |||
| 24 |
Turnberry Solutionsturnberrysolutions.com
Business and technology consulting firm delivering tailored solutions, premium talent, and innovative platforms for sustainable, meaningful growth and execution. |
784 | |||
| 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 |
714 | |||
| 26 |
DSG Globaldsgco.com
A global executive search firm with diverse, inclusive, and transformational leadership recruitment practices, operating nationwide with deep industry expertise |
652 | |||
| 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 |
591 | |||
| 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 |
582 | |||
| 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 |
561 | |||
| 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 |
559 | |||
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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.
More company lists in Philadelphia
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- Multinational companies in Philadelphia 76
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- Higher Education companies in Philadelphia 35
- Consulting firms in Philadelphia 34
- Hotel and hospitality groups in Philadelphia 28
The same list elsewhere in United States
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- Professional services firms in Florida 375
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- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 173
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- Professional services firms in North Carolina 142
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