Find a Pentest Company in Illinois
There are 70 penetration testing companies in Illinois. 69% are small firms (50 or fewer employees) and 31% are larger organizations.
Evolve Security
Cybersecurity company specializing in offensive penetration testing services, including application, network, cloud, social engineering, and physical security assessments; 44 employees, $4.3M revenue, founded 2016 in Chicago, Illinois; recent funding round completed in March 2025.
Illini Tech Services, Inc.
Managed IT service provider specializing in cybersecurity, networks, VOIP, and Starlink; offers comprehensive penetration testing services including external, internal, web app, wireless, and compliance assessments (HIPAA, FINRA, PCI-DSS); headquartered in Carlinville, Illinois, with 11 employees (+8.3% YoY growth), $1.5M revenue, and active regional presence.
iTeknologia, Inc.
Cybersecurity and IT consulting company specializing in penetration testing services; 2 employees, $35M annual revenue, founded 2003, headquartered in Chicago, Illinois, USA; provides managed IT, cybersecurity, and cloud management services with rapid growth.
RedLegg
IT services and cybersecurity company specializing in managed security solutions, penetration testing, and threat intelligence; 50 employees, $42.1M revenue, founded 2008 in St. Charles, Illinois, USA; recognized as a top MSSP, SOC II and CREST certified, with a focus on personalized security services and active industry presence.
Spector Security
Security and investigations company specializing in penetration testing, security assessment, and on-site training; provides physical, cyber, and social engineering pentest services; 2 employees, founded 2018, Arlington Heights, Illinois.
Abira Security
Abira Security is a cybersecurity-focused IT services and consulting company based in Chicago, Illinois, founded in 2019. With 16 employees and 23.1% YoY growth, they offer penetration testing, cloud security, and breach avoidance services, emphasizing professional expertise and reliability in digital security solutions. The firm maintains active social media and industry engagement, recently collaborating with Great American Insurance Group to strengthen cyber risk management.
MSMNET Security
MSMNET Security is a boutique cybersecurity firm specializing in penetration testing, security assessments, and application security engineering; with 2 employees, founded in 2000, headquartered in Chicago, Illinois, USA, and focused on delivering expert-level cybersecurity solutions.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
Trustwave, A LevelBlue Company
Cybersecurity company specializing in managed detection, response, and penetration testing; 600 employees, $322.4M revenue, founded 1995 in Chicago, Illinois; $10M funding; recently acquired by LevelBlue to form the world's largest managed security services provider.
Secure Bytes
IT services and consulting firm specializing in information security and automated auditing tools; offers penetration testing services as part of its security portfolio. Based in Glenview, Illinois, with 4 employees and $6.9M annual revenue, founded in 2004.
Urbane Security
Urbane Security is a private computer and network security consultancy based in Chicago, Illinois, founded in 2009. With 4 employees and $3.3M annual revenue, it specializes in penetration testing services, including network and application security assessments to identify and remediate security vulnerabilities. The firm serves Fortune 500 companies, SMBs, and startups, providing offensive and defensive security, compliance, and innovative research solutions.
InPath Security
IT services and cybersecurity consulting firm founded in 2018; based in Chicago, Illinois; 3 employees; offers penetration testing, vulnerability assessments, web security testing, and security training; provides services to campus communities and alumni; references penetration testing explicitly on its website.
SafeHill
SafeHill is a cybersecurity firm based in Chicago, Illinois, specializing in AI‑driven, human‑hybrid continuous penetration testing through its SecureIQ platform; 8 employees, $236K annual revenue, founded 2025, with a focus on threat exposure management and vulnerability remediation.
Harrington Technology & Associates, Inc.
IT services and cybersecurity consulting firm specializing in penetration testing and security assessments; 5 employees, $20.2M revenue, founded 2001, based in Chicago, Illinois, with expertise in cybersecurity, cloud, and IT staffing.
HALOCK Security Labs
Cybersecurity firm specializing in penetration testing, offensive security, and cybersecurity governance; offers external, internal, wireless, web‑application, social‑engineering, assumed‑breach, adversary‑simulation, and continuous testing services, with current published pages (2025-2026) confirming active pentest offerings; based in Schaumburg, Illinois, with 22 employees and $2.1M annual revenue.
Advertise on pentest.fyi
You could be here!
Latacora
Latacora is a private information security company based in Chicago, Illinois, specializing in penetration testing and application security services; 37 employees with 6.7% YoY growth, founded in 2016, serving tech companies with security assessments and compliance support.
NowSecure
Cybersecurity company specializing in mobile app security testing and risk management; 73 employees, $25.4M annual revenue, founded 2009 in Chicago, Illinois; $27.5M funding; offers penetration testing services including mobile app penetration testing and PTaaS; ranked #552,411 globally; active in industry news and social media.
Deep Security
Deep Security is a private cybersecurity firm specializing in computer and network security, including penetration testing, risk assessment, vulnerability assessments, and managed security services; founded in 2016 with 2 employees, headquartered in Aurora, Illinois, USA. The company focuses on high-quality IT hygiene and in-depth security testing by certified experts.
Coalfire
Coalfire is a cybersecurity and compliance services provider based in Chicago, Illinois, founded in 2001. With 676 employees and $200M annual revenue, it specializes in penetration testing, vulnerability assessments, FedRAMP, cloud migration, and AI risk management, serving enterprise, healthcare, and finance sectors. The company has received $9.4M in funding and is known for offensive security capabilities, including penetration testing services.
Level Nine Group
IT services and cybersecurity consultancy specializing in healthcare; 13 employees with -4.8% YoY growth; based in Chicago, Illinois; offers penetration testing, application security, risk management, and cybersecurity advisory services; founded in 2007; global rank #4,639,065 with 3,986 monthly visits.
Business CyberSecurity Solutions
IT services and consulting company specializing in cybersecurity, data privacy, and compliance; provides penetration testing and vulnerability scanning; 2 employees; founded 2016; headquartered in Inverness, Illinois, USA.
Cyber Bark LLC
IT services and consulting company specializing in cybersecurity, penetration testing, web development, and business intelligence; 5 employees with 50% YoY growth; based in Chicago, Illinois, USA; offers security assessments including penetration testing (external/internal/web/api/cloud); 5-star employer rating based on 1 review.
The Hack Ninja
Cybersecurity firm specializing in penetration testing, security consulting, and vulnerability assessments; founded in 2021, with 2 employees and 100% YoY growth; based in Shorewood, Illinois, United States, with a focus on detailed, high-quality security services.
Securion
Cybersecurity consultancy specializing in penetration testing, vulnerability assessment, and security advisement; 27 employees with 7.1% YoY growth, founded in 2014 and based in Chicago, Illinois, USA • Recognized for innovative, vendor-agnostic security solutions and recent awards from AV-Comparatives.
Apex IT and Cybersecurity Solutions
Cybersecurity and IT services company based in Chicago, Illinois; specializes in penetration testing, systems auditing, managed services, and cloud security; 2 employees with +300% YoY growth since 2018.
Virtual Auditor
Virtual Auditor is a private IT services and consulting company specializing in information security, IT audits, and vulnerability assessments; with 2 employees, founded in 2013, headquartered in Champaign, Illinois. The company explicitly offers vulnerability scanning and penetration testing services, focusing on security testing and risk mitigation.
RKON
IT Services and IT Consulting company specializing in IT Transformation and Cybersecurity; 115 employees, $21.6M revenue, founded 1998 in Chicago, Illinois; offers penetration testing, vulnerability assessments, and security advisory services, with recent acquisitions and strategic partnerships highlighting its cybersecurity focus.
LumaGuard
IT services and cybersecurity consulting firm specializing in penetration testing; offers vulnerability assessment & management services, with a focus on small to mid-sized regulated organizations; based in Chicago, Illinois, with 2 employees.
B Suite Cyber Security
IT services and cybersecurity company based in Chicago, IL, founded in 2017; 2 employees; specializes in penetration testing, risk management, and secure IT infrastructure for SMBs and enterprises nationwide; known for breach risk mitigation and compliance in the financial industry.
Wersec
Cybersecurity service provider specializing in penetration testing, security training, risk assessment, and consulting for SMBs; based in Naperville, Illinois with 2 employees.
Stop wasting time on security questionnaires
ResponseHub uses AI to automate your security questionnaire responses. 100% confidence, save days, unblock deals.
Chicago Technology Group
IT services and consulting company specializing in cybersecurity; offers penetration testing, vCISO, and security assessment services; 3 employees; founded 1998; headquartered in Chicago, Illinois, United States.
Override Industries
Override Industries is a private computer and network security firm founded in 2021, headquartered in Springfield, Illinois, USA, with 1 employee. The company specializes in high-end IT and digital marketing solutions, including consulting, design, implementation, and security services. It explicitly offers penetration testing services for web apps, networks, and social engineering, demonstrating its focus on comprehensive cybersecurity testing.
DefendEdge
DefendEdge is a cybersecurity company headquartered in Elmhurst, Illinois, with 86 employees and $7M annual revenue. It specializes in security operations, threat intelligence, and penetration testing services, leveraging next-generation technology to protect clients' firewalls, endpoints, and applications. The firm is a leading US-based MSSP with a focus on active offensive security and managed detection & response.
Virtek IT Consulting
Cybersecurity and IT consulting firm based in Joliet, Illinois; provides penetration testing and security assessment services to identify vulnerabilities and improve security.
HGS
Customer experience and cybersecurity company headquartered in Illinois, United States; provides penetration testing and security assessment services as part of its cybersecurity offerings; global presence with offices in US and India.
Advanced It
Cybersecurity and managed IT services provider based in Chicago, Illinois; offers penetration testing services with active testing capabilities and dedicated security solutions; supports Chicago businesses with cybersecurity and IT support.
Ascend Technologies
Cybersecurity company specializing in penetration testing services; headquartered in Chicago, Illinois, USA, with active engagement in security testing and vulnerability assessments.
Verity IT
Managed IT services, cybersecurity, and cloud solutions provider based in Downers Grove, Illinois; offers penetration testing and security assessments to identify vulnerabilities and enhance cybersecurity posture.
Agility Network Services
Illinois-based IT services and consulting firm headquartered in Chicago; provides managed IT, cloud management, and IT security services, including penetration testing for applications and perimeter/firewall security.
Expresstek Services
Illinois-based IT company headquartered in Chicago; provides cybersecurity services including ethical hacking and penetration testing, with active engagement in vulnerability assessment and security testing activities.
Data Defenders
Cybersecurity firm based in Chicago, Illinois, specializing in risk management, cybersecurity infrastructure, and disaster recovery; offers network penetration testing services to evaluate security posture.
Dot Security
Cybersecurity firm based in Lake Forest, Illinois, providing penetration testing, risk assessment, and cybersecurity consulting; explicitly states performing penetration tests and risk audits, with a focus on active testing and security evaluation.
CTI Technology
IT & Services company specializing in managed IT and cybersecurity solutions, including penetration testing and red team exercises; based in Illinois, USA with 11 employees, $7.5M revenue, founded in 2004, serving Chicagoland area.
Cyfenders
Cybersecurity consulting firm based in Illinois, providing leadership, operational support, and assurance services; offers penetration testing to identify vulnerabilities and validate security controls.
TechGuard Security
TechGuard Security is a private cybersecurity company specializing in computer and network security, with 42 employees and $8.4M annual revenue. Founded in 2000 and headquartered in O'Fallon, Illinois, it offers penetration testing services supported by tools like BurpSuite and Tenable. The firm has a web presence with 5,080 monthly visits and a global rank of #3,416,944, serving the B2B market with a focus on proactive cybersecurity solutions and training.
UncommonX
Cybersecurity company headquartered in Chicago, Illinois; specializes in advanced security solutions including penetration testing, vulnerability assessments, and web application security; has achieved zero reportable breaches and offers 24/7 SOC monitoring.
AGB Investigative Services
Security and investigations company founded in 2001; based in Illinois, United States; 52 employees, $24.2M revenue; offers security guard services, cyber security including penetration testing, background checks, private investigations, and security consulting; serves businesses, government, and individuals.
UncommonX
Cybersecurity company based in Chicago, Illinois, providing penetration testing (Pentest as a Service); specializes in active security assessments, threat detection, and response solutions. The company emphasizes comprehensive security management and has a strong focus on breach prevention.
Cybermode
Cybermode is a cybersecurity firm based in Chicago, Illinois, specializing in comprehensive security assessment services such as penetration testing, enterprise risk assessment, and cyberarchitect solutions. The company has 1 employee and actively provides penetration testing services, focusing on shielding networks and addressing cyber threats.
Apolloguard
Cybersecurity firm based in Chicago, Illinois; specializes in offensive and defensive security including penetration testing, vulnerability scanning, incident response, and consulting; explicitly conducts thorough penetration tests to identify vulnerabilities.
DataGuard
Cybersecurity company headquartered in Chicago, Illinois, United States; provides penetration testing services as a core offering, with a focus on security assessments and vulnerability testing.
7 LAYER SOLUTIONS INC
Illinois-based IT solutions firm providing comprehensive IT products and services, including cybersecurity, vulnerability management, and penetration testing; headquartered in Schaumburg, IL.
Xiarch Bharat
Cybersecurity company specializing in penetration testing, digital forensics, and security consulting; 35 employees with 67.7% YoY growth, $2.3M revenue, founded 2008, headquartered in New Delhi, India, with delivery centers in Chicago, Illinois, USA; offers network, web application, API, wireless testing, and red team attack simulations.
accentedge
IT Services and IT Consulting company specializing in telecommunications, cybersecurity, digital transformation, and cloud computing; 3 employees with 50% monthly and yearly growth; founded 2018; headquartered in Chicago, Illinois, USA; provides active penetration testing services with certified pentesters.
Illumination
Cybersecurity consulting firm headquartered in Cherry Valley, Illinois; specializes in penetration testing, red team engagements, and security assessments to identify vulnerabilities in networks, web, and mobile applications.
Halborn
Cybersecurity firm specializing in blockchain security; headquartered in Illinois, USA; offers penetration testing, smart contract audits, and red teaming for enterprise digital assets and blockchain infrastructure.
Greatsys
Greatsys is an Illinois-based IT services provider with over 20 years of experience and more than 70 specialists. They offer managed IT, consulting, and cybersecurity services, including penetration testing and vulnerability assessments, emphasizing trust, support, and tailored solutions.
Version2, LLC
IT services and consulting company based in Chicago, Illinois, with 8 employees and 9.1% YoY growth; specializes in cybersecurity, managed IT, and security awareness training, with active penetration testing services including network penetration testing to identify vulnerabilities.
Enkaytech
IT services company based in Lisle, Illinois, specializing in application integration, data, and AI solutions; offers cybersecurity services including penetration testing, security monitoring, and IAM, supported by third-party profiles; focuses on cloud and automation to drive innovation.
Beyond Key
IT consulting and software development company based in Chicago, Illinois, specializing in cloud, AI, BI, and custom solutions; offers penetration testing services with active capabilities in vulnerability assessment and web application security.
VIS Mountain Marketing & Advertising
Illinois-based digital marketing agency specializing in SEO, web design, and local marketing services in the Chicagoland area; offers penetration testing services as part of security and compliance solutions, with active presence on their dedicated security landing page.
Advertise on pentest.fyi
You could be here!
CTS Computers
IT services and consulting company based in Illinois, USA; founded in 1991; 7 employees; $23.9M revenue; provides managed IT, cloud, security, and business continuity services; actively offers penetration testing including network, web app, and social engineering assessments; serves Danville, Terre Haute, and Indianapolis.
Webit Services, Inc.
Illinois-based IT support and cybersecurity provider headquartered in Naperville; offers penetration testing services as part of their cybersecurity solutions, emphasizing secure coding practices and remote support capabilities.
.png)
VikingCloud
Cybersecurity company based in Chicago, Illinois, providing penetration testing services such as application and network testing; supports over 4 million businesses globally with compliance and security solutions.
Infotech Solutions & Services Inc.
Managed IT services provider based in Normal, Illinois; offers cybersecurity solutions including external and internal penetration testing with an ethical hacking team to identify security vulnerabilities.
Excaltech
Managed IT services provider headquartered in Rolling Meadows, Illinois; offers cybersecurity and penetration testing services, including Black Box third-party testing and vulnerability assessments.
Computers Nationwide
Illinois-based IT and security solutions provider; offers managed IT, cybersecurity, and penetration testing services; serves Northern Illinois and Greater Chicago; headquartered in Vernon Hills, Illinois.
Datastrive
Chicago IT support and cybersecurity provider specializing in managed IT services and penetration testing; based in Illinois with a focus on cybersecurity solutions, including vulnerability scanning and pentest services, as evidenced by their subdomain content.
Secure Data Technologies, Inc.
Cybersecurity company based in O'Fallon, Illinois, specializing in penetration testing and security assessments; offers proactive vulnerability testing and ethical hacking services to mid- and enterprise-level clients.
State of Illinois
Government of Illinois based in Springfield, Illinois, with 3,471 employees (+6.3% YoY growth); provides public services, information, and security testing including penetration testing as part of its security offerings; operates in government, education, employment, and resident services sectors.
UNCOMN
Cybersecurity firm based in Illinois, specializing in penetration testing and ethical hacking; headquartered at Scott Air Force Base, IL, with active cyber security assessment services.