# The 35 largest professional services firms in Delaware
Tamtam tracks 35 professional services firms headquartered in Delaware. This list ranks all of them by number of employees on LinkedIn, led by CSC, Integrity Staffing Solutions and The Siegfried Group. Their median headcount is 318. Half of them were founded in 2013 or later. The most common headquarters are Wilmington (18), Dover (5) and Lewes (2).
These companies in Delaware are primarily professional services firms, ranging from large global business administration providers to specialized IT and HR services. They include CSC, which offers global business administration and compliance solutions, and Integrity Staffing Solutions, connecting talent with companies. Other examples are The Siegfried Group, providing financial executives with leadership advisory, and zeb, a digital transformation strategy company.
The data shows a strong concentration of headquarters in Wilmington, with most of the listed companies based there. The firms also represent a mix of established companies like The Siegfried Group, founded in 1988, and newer entities such as Allied Market Research, founded in 2013, indicating a diverse founding era.
๐บ๐ธ Delaware ยท 35 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CSC](https://www.tamtam.ai/c/csc) (cscglobal.com)
Global business administration and compliance solutions for alternative asset managers, capital markets, digital brand protection, domain management, and corporate tax software services. | Financial Services | ๐บ๐ธ Wilmington | 8,233 | |
| 2 | [Integrity Staffing Solutions](https://www.tamtam.ai/c/integrity-staffing-solutions) (integritystaffing.com)
Connecting great talent with companies, generating opportunities for success, and driving the workforce forward with thousands of job opportunities available nationwide | Staffing and Recruiting | ๐บ๐ธ Newark | 1,642 | 1997 |
| 3 | [The Siegfried Group](https://www.tamtam.ai/c/the-siegfried-group) (siegfriedgroup.com)
An entrepreneurial leadership organization providing financial executives with leadership advisory, talent delivery, and financial advisory services to help them succeed | Business Consulting and Services | ๐บ๐ธ Wilmington | 1,595 | 1988 |
| 4 | [zeb](https://www.tamtam.ai/c/zeb-wilmington) (zeb.co)
A digital transformation strategy company using AI-powered methodology to drive innovation and maximize ROI for global clients in various industries | Software Development | ๐บ๐ธ Wilmington | 768 | |
| 5 | [PalTech](https://www.tamtam.ai/c/paltech) (pal.tech)
Specializing in digital transformation services, we provide expertise in product engineering across various industries with a focus on innovation and customer success | IT Services and IT Consulting | ๐บ๐ธ Delaware | 725 | 2000 |
| 6 | [EC Innovations, Inc.](https://www.tamtam.ai/c/ec-innovations-inc) (ecinnovations.com)
Deliver bespoke localization services combining technology, linguistics, and expertise to create authentic local versions of key assets worldwide. | Translation and Localization | ๐บ๐ธ Wilmington | 717 | 1997 |
| 7 | [TekisHub Consulting Services](https://www.tamtam.ai/c/tekishub-consulting-services) (tekishub.com)
Staff augmentation, software development, and recruitment process outsourcing company providing multi-platform application solutions globally from USA and India Specializing in high-quality service and cost-effective solutions | IT Services and IT Consulting | ๐บ๐ธ Wilmington | 658 | 2008 |
| 8 | [Careerminds](https://www.tamtam.ai/c/careerminds) (careerminds.com)
This company offers outplacement, executive coaching, and career development services globally in multiple languages using technology and personalized coaching | Human Resources Services | ๐บ๐ธ Wilmington | 552 | 2007 |
| 9 | [Allied Market Research](https://www.tamtam.ai/c/allied-market-research) (alliedmarketresearch.com)
A market research and business consulting firm based in Portland, Oregon, offering valuable insights to clients through qualitative and quantitative research across industries | Market Research | ๐บ๐ธ Wilmington | 433 | 2013 |
| 10 | [PATTERNS LLC](https://www.tamtam.ai/c/patterns-llc) (patternshiring.com)
A leading Business Process Outsourcing company specializing in staffing solutions, focused on providing top talent efficiently and transparently through innovative technology and personalized service | Staffing and Recruiting | ๐บ๐ธ Claymont | 421 | 2016 |
| 11 | [Medical Billers and Coders (MBC)](https://www.tamtam.ai/c/medical-billers-and-coders-mbc) (medicalbillersandcoders.com)
A nationwide consortium of Medical Billers and Coders providing customized billing solutions to physicians with a focus on local expertise and technology | Hospitals and Health Care | ๐บ๐ธ Wilmington | 399 | 1999 |
| 12 | [Escalon Services](https://www.tamtam.ai/c/escalon-services) (escalon.services)
Outsourced finance, accounting, tax, HR, and insurance services for startups, SMBs, and non-profits to simplify back-office operations. | Accounting | ๐บ๐ธ Dover | 358 | 2006 |
| 13 | [Vizva Consultancy Services](https://www.tamtam.ai/c/vizva-consultancy-services) (vizvaconsultancyservices.com)
Connecting people with opportunities to help businesses succeed and careers flourish, promoting united growth without inequity Stand for "entire world" in Sanskrit | IT Services and IT Consulting | ๐บ๐ธ Dover | 355 | 2021 |
| 14 | [TT Consultants](https://www.tamtam.ai/c/tt-consultants) (ttconsultants.com)
A global leader in IP, technology intelligence, business research, and innovation support blending AI and human expertise for clients worldwide | Business Consulting and Services | ๐บ๐ธ Wilmington | 348 | 2006 |
| 15 | [CSC Global Financial Markets](https://www.tamtam.ai/c/csc-global-financial-markets) (cscgfm.com)
Global provider of business administration, compliance, alternative asset management services, capital markets transactions, DNS management, digital fraud protection, and corporate tax software solutions | Financial Services | ๐บ๐ธ Delaware | 340 | |
| 16 | [SD Solutions](https://www.tamtam.ai/c/sd-solutions) (sdsolutions.tech)
Scaling Partner providing talent management, consulting, and staffing services for tech companies worldwide Offers end-to-end solutions for global growth needs | Staffing and Recruiting | ๐บ๐ธ Wilmington | 338 | 2016 |
| 17 | [Richards, Layton & Finger](https://www.tamtam.ai/c/richards-layton-and-finger) (rlf.com)
A leading Delaware law firm offering top-notch counsel and representation in corporate law, governance, mergers, acquisitions, and civil matters for global clients | Legal Services | ๐บ๐ธ Wilmington | 336 | 1899 |
| 18 | [Wattmonk Technologies](https://www.tamtam.ai/c/wattmonk-technologies) (wattmonk.com)
A leading solar company revolutionizing clean energy with innovative solutions for a sustainable future, offering comprehensive solar design services #SolarDesignCompany | Services for Renewable Energy | ๐บ๐ธ Delaware | 318 | 2019 |
| 19 | [HashRoot](https://www.tamtam.ai/c/hashroot) (hashroot.com)
This company offers AI, Cloud & DevOps, Data Center management, staff augmentation, IT automation, and digital transformation solutions to global clients. | IT Services and IT Consulting | ๐บ๐ธ Lewes | 282 | 2008 |
| 20 | [IT IDOL Technologies](https://www.tamtam.ai/c/it-idol-technologies) (itidoltechnologies.com)
A fast-growing company offering high-quality IT solutions, with skilled developers experienced in various programming languages for website and mobile app development | IT Services and IT Consulting | ๐บ๐ธ Dover | 279 | 2019 |
| 21 | [BURGEON IT SERVICES](https://www.tamtam.ai/c/burgeon-it-services) (burgeonits.com)
Burgeon provides technical and IT staff augmentation solutions globally, offering contract, contract-to-hire, direct hire, and payroll services with a focus on delivering skilled consultants | IT Services and IT Consulting | ๐บ๐ธ Claymont | 261 | 2010 |
| 22 | [Raas Infotek](https://www.tamtam.ai/c/raas-infotek) (raasinfotek.com)
A global IT services company offering end-to-end solutions, with a focus on building enduring relationships and adding value to clients' business growth | IT Services and IT Consulting | ๐บ๐ธ Newark | 210 | 2010 |
| 23 | [Binmile](https://www.tamtam.ai/c/binmile) (binmile.com)
Global IT services company specializing in digital transformation, software engineering, web and mobile application development, IoT solutions, and quality assurance for various industries worldwide | IT Services and IT Consulting | ๐บ๐ธ Claymont | 195 | 2017 |
| 24 | [NetBounce Placement](https://www.tamtam.ai/c/netbounce-placement) (netbounceplacement.com)
A professional job search firm specializing in direct hire recruitment of passive candidates, delivering impactful solutions for client needs | Staffing and Recruiting | ๐บ๐ธ Wilmington | 193 | 2023 |
| 25 | [Grant & Eisenhofer P.A.](https://www.tamtam.ai/c/grant-and-eisenhofer-p-a) (gelaw.com)
Specializing in complex financial litigation, including securities class actions, corporate governance issues, consumer protection, and more, achieving stellar results for institutional investors | Legal Services | ๐บ๐ธ Wilmington | 184 | 1997 |
| 26 | [Inno Valley Works](https://www.tamtam.ai/c/inno-valley-works) (innovalleyworks.com)
Inno Valley Works is a top Salesforce Implementation partner offering a range of services including setup, customization, integration, and staff training | IT Services and IT Consulting | ๐บ๐ธ Wilmington | 146 | 2018 |
| 27 | [Codleo Consulting](https://www.tamtam.ai/c/codleo-consulting) (codleo.com)
Provides smart, scalable, and human-centric digital solutions, empowering organizations to unlock higher ROI through CRM implementation, marketing automation, analytics, and AI. | IT Services and IT Consulting | ๐บ๐ธ Lewes | 136 | 2019 |
| 28 | [Technoladders](https://www.tamtam.ai/c/technoladders) (technoladders.com)
Fast-growing salesforce development company offering expertise, project management, and support to business organizations, with tailored solutions and industry-leading services | IT Services and IT Consulting | ๐บ๐ธ Wilmington | 39 | 2018 |
| 29 | [Corp1, Inc., - Registered Agent & Corporate Filings](https://www.tamtam.ai/c/corp1-inc-registered-agent-and-corporate-filings) (corp1.com)
A women-owned and veteran-owned company specializing in corporate services including company formation, registered agent services, corporate filings, and UCC searches | Legal Services | ๐บ๐ธ Dover | 32 | 1989 |
| 30 | [YF Consultants](https://www.tamtam.ai/c/yf-consultants) (yf-consultants.com)
A pioneering hospitality management consulting company delivering innovative strategies, personalized services, and profitable opportunities through comprehensive expertise and solutions | Hospitality | ๐บ๐ธ Delaware | 24 | 2018 |
| 31 | [Data Doers](https://www.tamtam.ai/c/data-doers) (datadoers.co)
A consulting firm specializing in data solutions, offering services in data engineering, analytics, governance, business intelligence, visualization, machine learning, and data-driven applications | IT Services and IT Consulting | ๐บ๐ธ Wilmington | 8 | |
| 32 | [Digicomplish](https://www.tamtam.ai/c/digicomplish) (digicomplish.com)
Providing transformative talent, digital, and upskilling services to empower individuals and businesses to thrive in the digital age | IT Services and IT Consulting | ๐บ๐ธ Wilmington | 7 | 2018 |
| 33 | [Sustainability Business](https://www.tamtam.ai/c/sustainability-business) (sustainability.business)
A company focused on sustainability, energy efficiency, and social & environmental strategies for businesses to reduce risks and optimize resources | Business Consulting and Services | ๐บ๐ธ Delaware | 3 | 2021 |
| 34 | [AutologicAI](https://www.tamtam.ai/c/autologicai) (autologicai.com)
A leading software consulting firm specializing in driving digital transformation through automation, AI, and innovation for small and medium-sized enterprises | IT Services and IT Consulting | ๐บ๐ธ Dover | 3 | 2023 |
| 35 | [AVEN ADVISORS](https://www.tamtam.ai/c/aven-advisors) (avenadvisors.com)
A company dedicated to making a positive impact by providing great services or products that benefit the common good | Business Consulting and Services | ๐บ๐ธ Wilmington | 1 | 2023 |
## 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 11, 2026.
## More company lists in Delaware
- [The largest companies in Delaware](https://www.tamtam.ai/l/largest-companies-delaware) (579)
- [IT Services and IT Consulting companies in Delaware](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-delaware) (108)
- [Multinational companies in Delaware](https://www.tamtam.ai/l/multinational-companies-delaware) (106)
- [SaaS companies in Delaware](https://www.tamtam.ai/l/saas-companies-delaware) (103)
- [IT services companies in Delaware](https://www.tamtam.ai/l/it-services-companies-delaware) (93)
- [Software Development companies in Delaware](https://www.tamtam.ai/l/software-development-companies-delaware) (83)
- [AI companies in Delaware](https://www.tamtam.ai/l/ai-companies-delaware) (42)
- [Technology, Information and Internet companies in Delaware](https://www.tamtam.ai/l/technology-information-and-internet-companies-delaware) (39)
- [AI-native companies in Delaware](https://www.tamtam.ai/l/ai-native-companies-delaware) (33)
- [Manufacturers in Delaware](https://www.tamtam.ai/l/manufacturers-delaware) (33)
- [Companies with in-house R&D in Delaware](https://www.tamtam.ai/l/r-and-d-companies-delaware) (32)
- [Financial Services companies in Delaware](https://www.tamtam.ai/l/financial-services-companies-delaware) (30)
- [AI consultancies and service providers in Delaware](https://www.tamtam.ai/l/ai-service-providers-delaware) (28)
- [Consulting firms in Delaware](https://www.tamtam.ai/l/consulting-firms-delaware) (27)
- [Education providers in Delaware](https://www.tamtam.ai/l/education-companies-delaware) (27)
- [Subscription businesses in Delaware](https://www.tamtam.ai/l/subscription-businesses-delaware) (27)
## The same list elsewhere in United States
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,078)
- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Professional services firms in Florida](https://www.tamtam.ai/l/professional-services-firms-florida) (375)
- [Professional services firms in Virginia](https://www.tamtam.ai/l/professional-services-firms-virginia) (344)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Professional services firms in Massachusetts](https://www.tamtam.ai/l/professional-services-firms-massachusetts) (249)
- [Professional services firms in New Jersey](https://www.tamtam.ai/l/professional-services-firms-new-jersey) (249)
- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (172)
- [Professional services firms in Washington State](https://www.tamtam.ai/l/professional-services-firms-washington-state) (163)
- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (135)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (125)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
- [Professional services firms in Houston](https://www.tamtam.ai/l/professional-services-firms-houston) (156)
- [Professional services firms in Atlanta](https://www.tamtam.ai/l/professional-services-firms-atlanta) (143)
- [Professional services firms in San Francisco](https://www.tamtam.ai/l/professional-services-firms-san-francisco) (130)
- [Professional services firms in Washington](https://www.tamtam.ai/l/professional-services-firms-washington) (109)
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Source: https://www.tamtam.ai/l/professional-services-firms-delaware