This selection of consulting firms in Philadelphia highlights a diverse range of specialized services, predominantly from established, mid-sized companies. Key players include Korn Ferry Hay Group, a global organizational consulting firm; Yoh, A Day & Zimmermann Company, specializing in staffing and talent demands; Pennoni, delivering engineering solutions; and PFM, offering financial advisory and consulting services. These firms demonstrate a strong presence in professional services critical to various industries.
The companies listed show a significant concentration in engineering and civil engineering, alongside broader business and management consulting. Many of these firms, such as Urban Engineers and McCormick Taylor, Inc., have been established for several decades, indicating a mature and well-rooted consulting sector in Philadelphia, with a strong focus on infrastructure and organizational development.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
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 | |||
| 2 |
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 | |||
| 3 |
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 | |||
| 4 | 823 | ||||
| 5 |
Turnberry Solutionsturnberrysolutions.com
Business and technology consulting firm delivering tailored solutions, premium talent, and innovative platforms for sustainable, meaningful growth and execution. |
784 | |||
| 6 |
DSG Globaldsgco.com
A global executive search firm with diverse, inclusive, and transformational leadership recruitment practices, operating nationwide with deep industry expertise |
652 | |||
| 7 |
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 | |||
| 8 |
EwingColeewingcole.com
A nationally recognized architecture, engineering, interior design, and planning firm with a focus on professional excellence, design quality, collaboration, and client advocacy |
491 | |||
| 9 |
Global Research and Consulting Groupgrcglobalgroup.com
A nonprofit organization with students from diverse backgrounds collaborates with NGOs and startups globally to provide pro-bono consulting and research, empowering future leaders |
475 | |||
| 10 |
Urban Engineersurbanengineers.com
A multidisciplinary consulting firm offering design, environmental, planning, and construction support services for various infrastructure projects since 1960 |
462 | |||
| 11 |
McCormick Taylor, Inc.mccormicktaylor.com
Civil engineering firm providing design, planning, and environmental solutions for transportation and energy projects, prioritizing relationships with clients, employees, and communities |
438 | |||
| 12 |
Burns Engineering, Inc.burns-group.com
A respected provider of specialized engineering services for transportation, infrastructure, and built environment projects, with a focus on outstanding client service |
402 | |||
| 13 |
Quanamquanam.com
A federation of specialized firms offering innovative consulting, management, communication, and change management services with a team of 400 specialists |
378 | |||
| 14 |
Customized Energy Solutionsces-ltd.com
Leading energy solutions company empowering clients in competitive markets, promoting economic development through efficient market management, technological advancements, and exceptional service |
361 | |||
| 15 |
Security Risk Advisorssra.io
The company provides cybersecurity services to top companies in various industries, and develops high-quality freeware for the benefit of all |
346 | |||
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 |
Tech Impacttechimpact.org
A nonprofit organization providing technology support and training to nonprofits and young adults to help them better serve their communities |
330 | |||
| 17 |
Crewturnberrysolutions.com
Innovative talent development program for high-performing junior consultants, delivering sustainable business and IT solutions with a focus on values-centered work |
312 | |||
| 18 | 
Moneywise Financial and Legal servicesww1.mortgagelawyers.us
A multi-service firm specializing in commercial financing, CMBS, CRE investment advisory, debt restructuring, and turnaround management for business and real estate owners |
212 | |||
| 19 |
Colliers Internationalcolliers.com
Specializing in commercial real estate, the company helps clients buy, sell, lease, and manage properties for businesses and investors |
210 | |||
| 20 |
Vynamicinizio.com
Global health management consulting firm specializing in Life Sciences, Health Services, and Health Technology, driving transformation and innovation through strategic guidance and hands-on support |
186 | |||
| 21 |
Bloom Works Public Benefit LLCbloomworks.digital
A woman-owned public benefit company specializing in digital services to help organizations improve customer experiences and create user-friendly products |
65 | |||
| 22 |
The MandMarblestone Groupmand.com
A leading tax law consulting firm specializing in designing, administering, and consulting on qualified retirement plans with experienced ERISA attorneys and in-house actuarial services |
46 | |||
| 23 |
Investment Performance Services, LLCips-net.com
Independent investment consulting firm offering education, proactive advice, and customized solutions for employee benefit plans, focusing on governance, ethics, and professionalism |
41 | |||
| 24 |
Saartheesaarthee.ai
Global analytics consulting firm offering holistic, tool-agnostic solutions for data and analytics, guided by a diverse team towards insights-fueled success |
39 | |||
| 25 |
Delta Thinkdeltathink.com
This company helps publishers navigate technology and content integration, anticipate and leverage change, and achieve growth and innovation in the industry |
14 | |||
| 26 |
iGrind Nation LLCigrindnation.com
A business consulting firm specializing in optimizing processes and implementing web technology to facilitate growth and innovation on a national level |
7 | |||
| 27 |
Valid Healthadapttechnicalgroup.com
The company specializes in implementing innovative technology solutions to streamline processes, improve delivery, and drive innovation, offering expertise in cloud, data, and healthcare solutions |
5 | |||
| 28 |
Boxplotboxplot.com
A US-based consulting firm offering data, AI, and development services to help organizations make informed decisions, solve problems, and meet business goals |
5 | |||
| 29 |
AVV Technologies Incavvtek.com
A digital transformation consultancy and software development company solving complex issues for enterprise clients, serving world-class brands as a visionary partner |
5 | |||
| 30 |
Chatsworth Consulting Groupchatsworthconsulting.com
A leadership development and training company focusing on team building, communication, and organizational change to help clients achieve sustainable growth and success |
3 | |||
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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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- Healthcare providers in Philadelphia 60
- Retail chains in Philadelphia 51
- Critical infrastructure operators in Philadelphia 41
- Financial services firms in Philadelphia 38
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- Companies with in-house R&D in Philadelphia 35
- Higher Education companies in Philadelphia 35
- Hotel and hospitality groups in Philadelphia 28
The same list elsewhere in United States
- Consulting firms in the United States 4,382
- Consulting firms in California 551
- Consulting firms in New York State 474
- Consulting firms in Texas 453
- Consulting firms in Virginia 283
- Consulting firms in Illinois 238
- Consulting firms in New Jersey 215
- Consulting firms in Florida 186
- Consulting firms in Georgia 167
- Consulting firms in Massachusetts 153
- Consulting firms in Pennsylvania 144
- Consulting firms in Ohio 115
- Consulting firms in Maryland 112
- Consulting firms in Washington State 106
- Consulting firms in Michigan 103
- Consulting firms in North Carolina 85
- Consulting firms in Alabama 78
- Consulting firms in Colorado 77
- Consulting firms in New York 368
- Consulting firms in Chicago 127
- Consulting firms in Houston 99
- Consulting firms in San Francisco 88
- Consulting firms in Atlanta 84
- Consulting firms in Washington 70