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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).

馃嚭馃嚫 Delaware35 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
CSCcscglobal.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 馃嚭馃嚫 Wilmington 8,233 n/a
2
Integrity Staffing Solutionsintegritystaffing.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 馃嚭馃嚫 Newark 1,642 1997
3
The Siegfried Groupsiegfriedgroup.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 馃嚭馃嚫 Wilmington 1,595 1988
4
zebzeb.co

A digital transformation strategy company using AI-powered methodology to drive innovation and maximize ROI for global clients in various industries

Software Development 馃嚭馃嚫 Wilmington 768 n/a
5
PalTechpal.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 馃嚭馃嚫 Delaware 725 2000
6
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 馃嚭馃嚫 Wilmington 717 1997
7
TekisHub Consulting Servicestekishub.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 馃嚭馃嚫 Wilmington 658 2008
8
Careermindscareerminds.com

This company offers outplacement, executive coaching, and career development services globally in multiple languages using technology and personalized coaching

Human Resources Services 馃嚭馃嚫 Wilmington 552 2007
9
Allied Market Researchalliedmarketresearch.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 馃嚭馃嚫 Wilmington 433 2013
10
PATTERNS LLCpatternshiring.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 馃嚭馃嚫 Claymont 421 2016
11
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 馃嚭馃嚫 Wilmington 399 1999
12
Escalon Servicesescalon.services

Outsourced finance, accounting, tax, HR, and insurance services for startups, SMBs, and non-profits to simplify back-office operations.

Accounting 馃嚭馃嚫 Dover 358 2006
13
Vizva Consultancy Servicesvizvaconsultancyservices.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 馃嚭馃嚫 Dover 355 2021
14
TT Consultantsttconsultants.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 馃嚭馃嚫 Wilmington 348 2006
15
CSC Global Financial Marketscscgfm.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 馃嚭馃嚫 Delaware 340 n/a
16
SD Solutionssdsolutions.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 馃嚭馃嚫 Wilmington 338 2016
17
Richards, Layton & Fingerrlf.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 馃嚭馃嚫 Wilmington 336 1899

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18
Wattmonk Technologieswattmonk.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 馃嚭馃嚫 Delaware 318 2019
19
HashRoothashroot.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 馃嚭馃嚫 Lewes 282 2008
20
IT IDOL Technologiesitidoltechnologies.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 馃嚭馃嚫 Dover 279 2019
21
BURGEON IT SERVICESburgeonits.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 馃嚭馃嚫 Claymont 261 2010
22
Raas Infotekraasinfotek.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 馃嚭馃嚫 Newark 210 2010
23
Binmilebinmile.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 馃嚭馃嚫 Claymont 195 2017
24
NetBounce Placementnetbounceplacement.com

A professional job search firm specializing in direct hire recruitment of passive candidates, delivering impactful solutions for client needs

Staffing and Recruiting 馃嚭馃嚫 Wilmington 193 2023
25
Grant & 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 馃嚭馃嚫 Wilmington 184 1997
26
Inno Valley Worksinnovalleyworks.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 馃嚭馃嚫 Wilmington 146 2018
27
Codleo Consultingcodleo.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 馃嚭馃嚫 Lewes 136 2019
28
Technoladderstechnoladders.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 馃嚭馃嚫 Wilmington 39 2018
29
Corp1, Inc., - Registered Agent & Corporate Filingscorp1.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 馃嚭馃嚫 Dover 32 1989
30
YF Consultantsyf-consultants.com

A pioneering hospitality management consulting company delivering innovative strategies, personalized services, and profitable opportunities through comprehensive expertise and solutions

Hospitality 馃嚭馃嚫 Delaware 24 2018
31
Data Doersdatadoers.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 馃嚭馃嚫 Wilmington 8 n/a
32
Digicomplishdigicomplish.com

Providing transformative talent, digital, and upskilling services to empower individuals and businesses to thrive in the digital age

IT Services and IT Consulting 馃嚭馃嚫 Wilmington 7 2018
33
Sustainability Businesssustainability.business

A company focused on sustainability, energy efficiency, and social & environmental strategies for businesses to reduce risks and optimize resources

Business Consulting and Services 馃嚭馃嚫 Delaware 3 2021
34
AutologicAIautologicai.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 馃嚭馃嚫 Dover 3 2023
35
AVEN ADVISORSavenadvisors.com

A company dedicated to making a positive impact by providing great services or products that benefit the common good

Business Consulting and Services 馃嚭馃嚫 Wilmington 1 2023

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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 11, 2026.

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