# 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.

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.

🇺🇸 Philadelphia · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Aramark](https://www.tamtam.ai/c/aramark) (aramark.com)<br>Global hospitality service provider delivering food and facilities management to educational institutions, healthcare providers, sports teams, and municipalities across sixteen countries worldwide. | Hospitality | 🇺🇸 Philadelphia | 56,723 | 1939 |
| 2 | [Morgan, Lewis & Bockius LLP](https://www.tamtam.ai/c/morgan-lewis-and-bockius-llp) (morganlewis.com)<br>Legal professionals providing corporate, transactional, litigation, and regulatory services to diverse industries worldwide, supporting clients' immediate and long-term goals. | Law Practice | 🇺🇸 Philadelphia | 5,068 | 1873 |
| 3 | [Korn Ferry Hay Group](https://www.tamtam.ai/c/korn-ferry-hay-group) (kornferry.com)<br>Global organizational consulting firm helping companies design their structure, roles, compensation, and hire talent to execute strategy in over 50 countries | Management Consulting | 🇺🇸 Philadelphia | 4,258 | 1943 |
| 4 | [Day & Zimmermann](https://www.tamtam.ai/c/day-and-zimmermann) (dayzim.com)<br>Global company specializing in construction, engineering, operations, maintenance, staffing, and security services with extensive experience and worldwide presence. | Construction | 🇺🇸 Philadelphia | 4,211 | 1901 |
| 5 | [HHM Hotels](https://www.tamtam.ai/c/hhm-hotels) (hhmhotels.com)<br>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 | 🇺🇸 Philadelphia | 2,716 |  |
| 6 | [Fox Rothschild](https://www.tamtam.ai/c/fox-rothschild) (foxrothschild.com)<br>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 | 🇺🇸 Philadelphia | 2,241 | 1907 |
| 7 | [Cozen O'Connor](https://www.tamtam.ai/c/cozen-o-connor) (linktr.ee)<br>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 | 🇺🇸 Philadelphia | 2,150 | 1970 |
| 8 | [Dechert LLP](https://www.tamtam.ai/c/dechert-llp) (dechert.com)<br>Provides legal advice on litigation, transactions, and regulatory matters across financial services, private capital, real estate, life sciences, and technology sectors. | Law Practice | 🇺🇸 Philadelphia | 2,145 | 1875 |
| 9 | [Yoh, A Day & Zimmermann Company](https://www.tamtam.ai/c/yoh-a-day-and-zimmermann-company) (yoh.com)<br>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 | 🇺🇸 Philadelphia | 2,059 | 1940 |
| 10 | [Ballard Spahr LLP](https://www.tamtam.ai/c/ballard-spahr-llp) (ballardspahr.com)<br>Provides litigation, transactional, and regulatory legal services to diverse clients, leveraging technology for efficiency and strategic counsel. | Law Practice | 🇺🇸 Philadelphia | 1,990 | 1885 |
| 11 | [Duane Morris LLP](https://www.tamtam.ai/c/duane-morris-llp) (duanemorris.com)<br>Provides innovative legal solutions globally with over 900 attorneys, emphasizing partnership, inclusiveness, and consensus in addressing client challenges. | Law Practice | 🇺🇸 Philadelphia | 1,952 | 1904 |
| 12 | [Blank Rome LLP](https://www.tamtam.ai/c/blank-rome-llp) (blankrome.com)<br>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 | 🇺🇸 Philadelphia | 1,749 | 1946 |
| 13 | [FCA](https://www.tamtam.ai/c/fca) (fcarchitects.com)<br>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 | 🇺🇸 Philadelphia | 1,604 | 1954 |
| 14 | [CMI Media Group](https://www.tamtam.ai/c/cmi-media-group) (cmimediagroup.com)<br>A full-service media agency specializing in health, wellness, and pharmaceutical marketing Offering audience strategy, data analytics, buying, and direct response services | Advertising Services | 🇺🇸 Philadelphia | 1,599 | 1989 |
| 15 | [ESIS, Inc.](https://www.tamtam.ai/c/esis-inc) (esis.com)<br>Provider of risk management services including claims management, pre- and post-loss services, and integrated absence management, backed by a global insurance leader | Insurance | 🇺🇸 Philadelphia | 1,395 | 1953 |
| 16 | [Pennoni](https://www.tamtam.ai/c/pennoni) (pennoni.com)<br>The firm partners with clients to deliver innovative, sustainable, and resilient engineering solutions, fostering long-term relationships focused on community impact | Engineering Services | 🇺🇸 Philadelphia | 1,317 | 1966 |
| 17 | [Marshall Dennehey](https://www.tamtam.ai/c/marshall-dennehey) (marshalldennehey.com)<br>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 | 🇺🇸 Philadelphia | 1,261 | 1962 |
| 18 | [Saul Ewing LLP](https://www.tamtam.ai/c/saul-ewing-llp) (saul.com)<br>A national law firm with 400 attorneys and top business professionals delivering practical advice, excellent service, and innovative solutions to clients globally | Law Practice | 🇺🇸 Philadelphia | 1,090 | 1921 |
| 19 | [Digitas Health](https://www.tamtam.ai/c/digitas-health) (digitashealth.com)<br>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 | 🇺🇸 Philadelphia | 913 | 1990 |
| 20 | [Pacer Group](https://www.tamtam.ai/c/pacer-group) (thepacer.com)<br>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 | 🇺🇸 Philadelphia | 867 | 2008 |
| 21 | [True Search](https://www.tamtam.ai/c/true-search) (trueplatform.com)<br>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 | 🇺🇸 Philadelphia | 867 | 2012 |
| 22 | [PFM](https://www.tamtam.ai/c/pfm) (pfm.com)<br>Financial advisors and consultants provide tailored financial advice, creative consultation, and strategic forecasting to empower clients and ensure sustainable outcomes. | Financial Services | 🇺🇸 Philadelphia | 823 | 1975 |
| 23 | [Your Part-Time Controller, LLC](https://www.tamtam.ai/c/your-part-time-controller-llc) (yptc.com)<br>A growing company specializing in nonprofit accounting, recognized for its strong relationships, diverse expertise, and commitment to building stronger nonprofits | Accounting | 🇺🇸 Philadelphia | 805 | 1993 |
| 24 | [Turnberry Solutions](https://www.tamtam.ai/c/turnberry-solutions) (turnberrysolutions.com)<br>Business and technology consulting firm delivering tailored solutions, premium talent, and innovative platforms for sustainable, meaningful growth and execution. | Business Consulting and Services | 🇺🇸 Philadelphia | 784 | 2001 |
| 25 | [Drinker Biddle & Reath LLP](https://www.tamtam.ai/c/drinker-biddle-and-reath-llp)<br>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 | 🇺🇸 Philadelphia | 714 | 1849 |
| 26 | [DSG Global](https://www.tamtam.ai/c/dsg-global) (dsgco.com)<br>A global executive search firm with diverse, inclusive, and transformational leadership recruitment practices, operating nationwide with deep industry expertise | Business Consulting and Services | 🇺🇸 Philadelphia | 652 | 1975 |
| 27 | [Magna Legal Services](https://www.tamtam.ai/c/magna-legal-services) (magnals.com)<br>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 | 🇺🇸 Philadelphia | 591 | 2007 |
| 28 | [Defender Association of Philadelphia](https://www.tamtam.ai/c/defender-association-of-philadelphia) (phillydefenders.org)<br>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 | 🇺🇸 Philadelphia | 582 | 1934 |
| 29 | [Richardson Sales Performance](https://www.tamtam.ai/c/richardson-sales-performance) (richardson.com)<br>Empowering sales teams worldwide with adaptable content, useful technology, and actionable metrics to drive real change and achieve better results | Professional Training and Coaching | 🇺🇸 Philadelphia | 561 |  |
| 30 | [PROSUL - Projetos, Supervisão e Planejamento Ltda.](https://www.tamtam.ai/c/prosul-projetos-supervisao-e-planejamento-ltda) (prosul.com)<br>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 | 🇺🇸 Philadelphia | 559 | 1987 |

## 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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Source: https://www.tamtam.ai/l/professional-services-firms-philadelphia