# List of consulting firms in Philadelphia

Tamtam tracks 34 consulting firms headquartered in Philadelphia. This list ranks the 30 largest by number of employees on LinkedIn, led by Korn Ferry Hay Group, Yoh, A Day & Zimmermann Company and Pennoni. Their median headcount is 346. Half of them were founded in 1987 or later.

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.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [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 |
| 7 | [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 |
| 8 | [EwingCole](https://www.tamtam.ai/c/ewingcole) (ewingcole.com)<br>A nationally recognized architecture, engineering, interior design, and planning firm with a focus on professional excellence, design quality, collaboration, and client advocacy | Architecture and Planning | 🇺🇸 Philadelphia | 491 | 1961 |
| 9 | [Global Research and Consulting Group](https://www.tamtam.ai/c/global-research-and-consulting-group) (grcglobalgroup.com)<br>A nonprofit organization with students from diverse backgrounds collaborates with NGOs and startups globally to provide pro-bono consulting and research, empowering future leaders | Business Consulting and Services | 🇺🇸 Philadelphia | 475 | 2016 |
| 10 | [Urban Engineers](https://www.tamtam.ai/c/urban-engineers) (urbanengineers.com)<br>A multidisciplinary consulting firm offering design, environmental, planning, and construction support services for various infrastructure projects since 1960 | Civil Engineering | 🇺🇸 Philadelphia | 462 | 1960 |
| 11 | [McCormick Taylor, Inc.](https://www.tamtam.ai/c/mccormick-taylor-inc) (mccormicktaylor.com)<br>Civil engineering firm providing design, planning, and environmental solutions for transportation and energy projects, prioritizing relationships with clients, employees, and communities | Civil Engineering | 🇺🇸 Philadelphia | 438 | 1946 |
| 12 | [Burns Engineering, Inc.](https://www.tamtam.ai/c/burns-engineering-inc) (burns-group.com)<br>A respected provider of specialized engineering services for transportation, infrastructure, and built environment projects, with a focus on outstanding client service | Engineering Services | 🇺🇸 Philadelphia | 402 | 1960 |
| 13 | [Quanam](https://www.tamtam.ai/c/quanam) (quanam.com)<br>A federation of specialized firms offering innovative consulting, management, communication, and change management services with a team of 400 specialists | IT Services and IT Consulting | 🇺🇸 Philadelphia | 378 | 1978 |
| 14 | [Customized Energy Solutions](https://www.tamtam.ai/c/customized-energy-solutions) (ces-ltd.com)<br>Leading energy solutions company empowering clients in competitive markets, promoting economic development through efficient market management, technological advancements, and exceptional service | Utilities | 🇺🇸 Philadelphia | 361 | 1998 |
| 15 | [Security Risk Advisors](https://www.tamtam.ai/c/security-risk-advisors) (sra.io)<br>The company provides cybersecurity services to top companies in various industries, and develops high-quality freeware for the benefit of all | Computer and Network Security | 🇺🇸 Philadelphia | 346 | 2010 |
| 16 | [Tech Impact](https://www.tamtam.ai/c/tech-impact) (techimpact.org)<br>A nonprofit organization providing technology support and training to nonprofits and young adults to help them better serve their communities | Non-profit Organizations | 🇺🇸 Philadelphia | 330 | 2002 |
| 17 | [Crew](https://www.tamtam.ai/c/crew-philadelphia) (turnberrysolutions.com)<br>Innovative talent development program for high-performing junior consultants, delivering sustainable business and IT solutions with a focus on values-centered work | Business Consulting and Services | 🇺🇸 Philadelphia | 312 |  |
| 18 | [Moneywise Financial and Legal services](https://www.tamtam.ai/c/moneywise-financial-and-legal-services) (ww1.mortgagelawyers.us)<br>A multi-service firm specializing in commercial financing, CMBS, CRE investment advisory, debt restructuring, and turnaround management for business and real estate owners | Financial Services | 🇺🇸 Philadelphia | 212 | 2007 |
| 19 | [Colliers International](https://www.tamtam.ai/c/colliers-international) (colliers.com)<br>Specializing in commercial real estate, the company helps clients buy, sell, lease, and manage properties for businesses and investors | Real Estate | 🇺🇸 Philadelphia | 210 | 1976 |
| 20 | [Vynamic](https://www.tamtam.ai/c/vynamic) (inizio.com)<br>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 | Business Consulting and Services | 🇺🇸 Philadelphia | 186 |  |
| 21 | [Bloom Works Public Benefit LLC](https://www.tamtam.ai/c/bloom-works-public-benefit-llc) (bloomworks.digital)<br>A woman-owned public benefit company specializing in digital services to help organizations improve customer experiences and create user-friendly products | IT Services and IT Consulting | 🇺🇸 Philadelphia | 65 | 2018 |
| 22 | [The MandMarblestone Group](https://www.tamtam.ai/c/the-mandmarblestone-group) (mand.com)<br>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 | Financial Services | 🇺🇸 Philadelphia | 46 | 1975 |
| 23 | [Investment Performance Services, LLC](https://www.tamtam.ai/c/investment-performance-services-llc) (ips-net.com)<br>Independent investment consulting firm offering education, proactive advice, and customized solutions for employee benefit plans, focusing on governance, ethics, and professionalism | Financial Services | 🇺🇸 Philadelphia | 41 | 1986 |
| 24 | [Saarthee](https://www.tamtam.ai/c/saarthee) (saarthee.ai)<br>Global analytics consulting firm offering holistic, tool-agnostic solutions for data and analytics, guided by a diverse team towards insights-fueled success | Business Consulting and Services | 🇺🇸 Philadelphia | 39 | 2015 |
| 25 | [Delta Think](https://www.tamtam.ai/c/delta-think) (deltathink.com)<br>This company helps publishers navigate technology and content integration, anticipate and leverage change, and achieve growth and innovation in the industry | Business Consulting and Services | 🇺🇸 Philadelphia | 14 | 2005 |
| 26 | [iGrind Nation LLC](https://www.tamtam.ai/c/igrind-nation-llc) (igrindnation.com)<br>A business consulting firm specializing in optimizing processes and implementing web technology to facilitate growth and innovation on a national level | Advertising Services | 🇺🇸 Philadelphia | 7 | 2013 |
| 27 | [Valid Health](https://www.tamtam.ai/c/valid-health) (adapttechnicalgroup.com)<br>The company specializes in implementing innovative technology solutions to streamline processes, improve delivery, and drive innovation, offering expertise in cloud, data, and healthcare solutions | IT Services and IT Consulting | 🇺🇸 Philadelphia | 5 | 2010 |
| 28 | [Boxplot](https://www.tamtam.ai/c/boxplot) (boxplot.com)<br>A US-based consulting firm offering data, AI, and development services to help organizations make informed decisions, solve problems, and meet business goals | Information Services | 🇺🇸 Philadelphia | 5 | 2017 |
| 29 | [AVV Technologies Inc](https://www.tamtam.ai/c/avv-technologies-inc) (avvtek.com)<br>A digital transformation consultancy and software development company solving complex issues for enterprise clients, serving world-class brands as a visionary partner | IT Services and IT Consulting | 🇺🇸 Philadelphia | 5 |  |
| 30 | [Chatsworth Consulting Group](https://www.tamtam.ai/c/chatsworth-consulting-group) (chatsworthconsulting.com)<br>A leadership development and training company focusing on team building, communication, and organizational change to help clients achieve sustainable growth and success | Business Consulting and Services | 🇺🇸 Philadelphia | 3 | 1995 |

## 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/consulting-firms-philadelphia