Directory · US
Computer and Network Security in United States
A register of firms and the professionals working at them in the Computer and Network Security sector based in United States. Browse the public index, then filter or export on Kipplo.
Companies
8.7K on file
Praetorian
Praetorian helps enterprises reduce material risk by revealing their environment exactly as an attacker would. Combining advanced adversarial testing, specialized offensive security services, and managed continuous offensive operations, Praetorian identifies and prioritizes the exposures that matter most. Its world-class security engineers apply deep technical expertise and authentic attacker tradecraft to map high-impact attack paths, validate defensive controls, and strengthen resilience for organizations that require uncompromising visibility and confidence in their security posture.
51 to 200 staff
Prescient Security
Prescient Security and Assurance, a global leader in cybersecurity, empowers over customers worldwide with our expertise in cloud-native technologies. Our services include compliance penetration tests and audit and attestation across 25+ frameworks such as SOC, ISO, HITRUST, FedRAMP, GDPR, PCI, and more.
51 to 200 staff
Redseal, Inc
RedSeal, a pioneer in proactive exposure management, helps organizations see, understand, and secure their hybrid digital environments—spanning IT, remote, OT, cloud, and IoT. By dynamically modeling the entire environment, RedSeal uncovers hidden assets, misconfigurations, and lateral attack paths; prioritizes exposures based on business-critical impact with Risk Radius™; and continuously validates compliance with internal policies and industry standards. Trusted by hundreds of Fortune companies and more than 75 U.S. government agencies, including all five branches of the U.S. military, RedSeal strengthens resilience, streamlines operations, and reduces business risk. Visit to learn more.
51 to 200 staff
Reliaquest
ReliaQuest is the world's leading Agentic AI cybersecurity company. We exist to Make Security Possible. Our Agentic AI security operations platform, GreyMatter, allows security teams to detect threats at the source, contain, investigate and respond in less than 5 minutes – eliminating Tier 1 and Tier 2 security operations work. GreyMatter uses our Universal Translator, detection-at-source, and Agentic AI to seamlessly connect telemetry from across cloud, multi-cloud and on-premises technologies. ReliaQuest is the only cybersecurity technology company that delivers outcomes specific to each organization's unique architecture, technology and business needs. With over customers and 1,200 teammates across six global operating centers, ReliaQuest Makes Security Possible for the most trusted enterprise brands in the world. Learn more at
1001 to 5000 staff
Reversinglabs
ReversingLabs is the trusted name in file and software security. We provide the modern cybersecurity platform to verify and deliver safe binaries. Trusted by the Fortune 500 and leading cybersecurity vendors, the ReversingLabs Spectra Core powers the software supply chain and file security insights, tracking over 40 billion searchable files daily with the ability to deconstruct full software binaries in seconds to minutes. Only ReversingLabs provides that final exam to determine whether a single file or full software binary presents a risk to your organization and your customers. RL - Trust Delivered.
201 to 500 staff
Rpost
RPost® is a global leader in eSignature and cybersecurity solutions, helping organisations secure their communications and digital transactions. Our AI-infused platforms — RMail®, RSign® and RDocs® — protect email, documents and workflows through encryption, eSignature automation, legal proof of delivery, document rights management and data leak prevention. RPost was recently named in the 2025 Gartner® Magic Quadrant™ for Email Security Platforms, underscoring our innovation and leadership in modern security. Backed by more than 50 granted patents, we have also been recognised as an IDC Worldwide Leader and Frost & Sullivan Global Leader in eSignatures, and an Aragon Research Innovator in Content Security and Leader in Digital Transaction Management. Trusted by over 25 million users in more than 100 countries, RPost enables organisations to track, prove, encrypt, e-sign, share and protect their most critical communications.
201 to 500 staff
Safebreach
Combining the mindset of a CISO and the toolset of a hacker, SafeBreach is the pioneer in breach-and-attack simulation (BAS) and is the most widely used platform for continuous security validation. SafeBreach continuously executes attacks, correlates results to help visualize security gaps, and leverages contextual insights to highlight remediation efforts. With its Hacker’s Playbook™, the industry’s most extensive collection of attack data enabled by state-of-the-art threat intelligence research, SafeBreach empowers organizations to get proactive about security with a simple approach that replaces hope with data. We’re looking for hackers and trailblazers to join us. If you're passionate about technology and like to break things, we want to hear from you! Join us, and make an impact!
51 to 200 staff
Sans Institute
SANS is the most trusted and by far the largest source for information and cybersecurity training and certification in the world. It also develops, maintains, and makes available at no cost, the largest collection of research documents about various aspects of information security, and it operates the Internet's early warning system - Internet Storm Center.
201 to 500 staff
Security Risk Advisors
We deliver cybersecurity consulting, 24x7 operations and SaaS to leading companies in the Financial Services, Healthcare, Pharmaceuticals, Technology and Retail industries. Level Up | It's Personal | Punch Above Your Weight
201 to 500 staff
Securitymetrics
We secure peace of mind for organizations that handle sensitive data by holding our tools, training, and support to a higher standard. Never have a false sense of security.™ We are PCI certified in Qualified Security Assessor (QSA), Approved Scanning Vendor (ASV), Certified Forensic Investigator (PFI), Qualified P2PE Application Assessor (P2PE QSA), PCI Software Security Framework (SSF) Assessor, Qualified Payment Application Assessor (PA-QSA), Qualified PIN Assessor (QPA), and a Managed Security provider with over 20 years of data security experience. We remain a leading provider in PCI and HIPAA compliance and we have tested over 1 million systems for vulnerabilities. We are one of only two companies worldwide certified by Visa, MasterCard, and the PCI Security Council, to conduct all major PCI validations: PCI scans (ASV) PCI DSS Assessments (QSA) Payment Application Data Security Standard Audits (PA-QSA) PCI Forensic Investigations (PFI) Point-to-Point Encryption Assessments (P2PE QSA) Our award-winning tools and customer service help simplify data security and compliance efforts at organizations of all sizes: PIIscan: discovers Personally Identifiable Information (PII) like SSNs, birth dates, and card data. PANscan: discovers cardholder data like Primary Account Numbers. Health Network Portal: tool to manage network-wide HIPAA compliance for large medical networks. Managed Firewall: managed in-house by data security and compliance experts. GDPR Defense for Small Businesses: tools to find PII and assess compliance with GDPR requirements. GDPR Consulting for Large Businesses: professional guidance from experienced network security experts. SecurityMetrics Mobile: scans devices for vulnerabilities. CCPA Training Webpage Integrity Monitoring (WIM) for e-Commerce JavaScript Skimming
501 to 1000 staff
Sentinelone
SentinelOne is the world's leading AI-powered cybersecurity platform. The SentinelOne Singularity platform, built on the first unified Data Lake, is revolutionizing security operations, with AI, solving use cases across Endpoint Protection, SIEM, Cloud Security, Identity Threat Detection and 24x7 Managed Threat Services. SentinelOne empowers the world to run securely by creating intelligent, data-driven systems that think for themselves, stay ahead of complexity and risk, and evolve on their own. Leading organizations—including Fortune 10, Fortune 500, and Global companies, as well as prominent governments – trust SentinelOne to Secure Tomorrow™. Learn more at sentinelone.com- We are recognized in leading 3rd party forums such as- Gartner Endpoint Protection Magic Quadrant as a Leader 2021, 2022, 2023, 2024, 2025 - Gartner Peer Insights Customer Choice for Endpoint Protection - Gartner Peer Insights Customer Choice Managed Detection & Response - Gartner Peer Insights Customer Choice Cloud-Native Application Protection Platform (CNAPP)- G2 #1 Ranked Cloud Workload Protection Platform - Mitre ATT & CK 100% Detections, No Delays 2020, 2021, 2022, 2023, 2024 - Mitre Managed Services 100% Major Step Detections - Fortune Fifty 2024 - Deloitte Fast 500; 2019, 2020, 2021, 2022, 2023, 2024 - CRN Cloud & Security 100 - CRN Most Influential CEO's - CRN Top 10 Coolest GenAI Products, PurpleAI To learn more about our products and services, please visit our website at sentinelone.com to schedule a demo
1001 to 5000 staff
Skybox Security
Prevent breaches before they happen. Get the intelligence and context you need to reduce cyber exposure at speed and scale. Skybox Security is the only platform that collectively visualizes and analyzes hybrid and multi-cloud networks, providing full context and understanding of the attack surface.
201 to 500 staff
Specterops
SpecterOps is the creator of BloodHound and a leader in Identity Risk Management. We use our deep expertise in adversary tradecraft to help organizations detect and remove critical attack paths before sophisticated attackers can take advantage of them. We call this Identity Attack Path Management, and we're deeply committing to helping security teams build this practice through industry-leading technology, research, training, and wide range of open source tools.
201 to 500 staff
Structured Communication Systems
Structured is an award-winning solution provider delivering secure, cloud-connected digital infrastructure and managed services. For 30 years, we’ve helped clients through all phases of digital transformation by securely bridging people, business and technology. Customers trust us to provide valuable insight throughout the process of selecting and implementing secure and scalable IT strategies, platforms, and processes that meet modern expectations and drive measurable improvements throughout the enterprise. Today’s connected economy utilizes technology much differently than it did a decade ago, driving change in how organizations interact with employees and clients. Further, global regulations affect companies of all sizes and mandate change to the way sensitive and personally identifiable information is obtained, processed, and stored. To meet competitive demands and maintain relevancy in their own markets, our customers must tackle digital transformation initiatives such as consumption-based IT (XaaS), mobility and user experience, multicloud integration, distributed workforce, and the challenges posed by IoT. Throughout this transformational journey, they rely on us to provide design guidance, engineering assistance, and product recommendations that adhere to industry best practices, boost ROI, and – most importantly – maximize information security.
51 to 200 staff
Synack
Synack is the leader in human-led and AI-powered Penetration Testing as a Service (PTaaS), transforming offensive security to help organizations proactively reduce risk, stay compliant and defend against evolving cyber threats. We are committed to making the world more secure by harnessing agentic AI innovations and a talented, vetted community of security researchers to deliver continuous penetration testing and autonomous vulnerability management. Founded by former NSA operatives, Synack has enabled nearly 10 million hours of expert testing to protect critical assets, from global financial systems to U.S. Defense Department networks.
201 to 500 staff
Tanium
Tanium is the Autonomous IT company. Driven by AI and real-time endpoint intelligence, Tanium Autonomous IT empowers IT and security teams to make their organizations unstoppable. Many of the world’s leading organizations trust Tanium’s single, unified platform for endpoint management and security to innovate faster, stay resilient and move business forward with confidence, at scale. Autonomous IT. Unstoppable Business. To learn how Tanium delivers Autonomous IT for unstoppable business - visit and follow us on LinkedIn and X.
1001 to 5000 staff
Team Cymru
Since 2005, Team Cymru’s mission has been to save and improve human lives by working with public and private sector analyst teams around the world, enabling them to track and take down bad actors of all kinds. The company delivers comprehensive visibility into global cyber threat activity and is a key source of intelligence for many cyber security and threat intelligence vendors. Its Community Services division provides no-cost threat detection, DDoS mitigation and threat intelligence to network operators, hosting providers and more than 143 CSIRT teams across 86+ countries. Enterprise security teams rely on its Pure Signal™ platform for on-demand visibility into what’s happening virtually anywhere across the internet with a clarity similar to that of their own internal network telemetry. With this visibility, they close detection gaps, accelerate incident response and detect threats and vulnerabilities across entire enterprises and third-party ecosystems.
51 to 200 staff
Telos Corporation
Telos empowers and protects the world’s most security-conscious organizations with solutions for continuous security assurance of individuals, systems, and information. Telos’ offerings include cybersecurity solutions for IT risk management and information security; cloud security solutions to protect cloud-based assets and enable continuous compliance with industry and government security standards; and enterprise security solutions for identity and access management, secure mobility, organizational messaging, and network management and defense. The company serves commercial enterprises, regulated industries and government customers around the world. At Telos, we realize that our success as a company stems directly from our success as an employer. That is why we are committed to finding, attracting, and keeping the best talent available. We reward expertise with professional growth and opportunity, an excellent salary, a flexible work environment, and an extensive benefits package. We recognize the challenges a demanding job can place on families, so we do our best to accommodate family-school-life-work balance. If this appeals to you, we invite you to put Telos on your career path. Headquartered in Ashburn, Virginia, outside the Washington, D.C. metropolitan area, Telos Corporation is located in the heart of the Dulles technology corridor. We have grown into a worldwide operation of professionals who are renowned for their software development, security, integration, systems management, and business expertise. We’re always looking for employees who share our core values and want more than just a job. We offer a business casual environment, and the opportunity to make a name for yourself as you contribute to our continued success. If you’re interested in joining our team, visit our careers page:
501 to 1000 staff
Threatconnect
ThreatConnect provides solutions to enable cyber defenders to continuously manage threat exposure and improve cyber resilience. Our threat and risk-informed defense products give defenders the advantage over adversaries with rich context, risk-based prioritization, and the ability to quickly and precisely act on emerging threats. Our products span threat, risk, and security operations, and come together in a single intelligence hub. More than 250 global enterprises rely on ThreatConnect every day to contextualize and prioritize emerging threats and automate defenses. To learn more visit:
51 to 200 staff
Threatmodeler Software, Inc
ThreatModeler was purposefully crafted to overcome the challenges businesses face as they shift to secure-by-design. Reducing the effort and complexity of traditional threat modeling methods, our intelligent solutions empower businesses to adopt a streamlined, high-velocity approach to identifying and mitigating threats. Now, with ThreatModeler, you can reduce risk across your portfolio seamlessly, connecting Cloud, Security, and Product teams – enabling organizations to secure-by-design at the speed of innovation. Founded in 2010, ThreatModeler is headquartered in Jersey City, NJ.
51 to 200 staff
Truno, Retail Technology Solutions
TRUNO is the national leader in integrated retail technology solutions. With 40 years of experience and innovation, customer sites, unmatched customer service, and a best-in-class product portfolio, TRUNO provides secure, stable and integrated technology solutions empowering businesses of any size to succeed in an ever-changing, competitive environment. TRUNO’s expertly vetted product portfolio includes solutions in point of sale, margin management, productivity, digital commerce, and risk management. With complete integration into sales data and operations, TRUNO delivers end-to-end technology solutions that can be crafted to meet the unique needs of each retailer.
201 to 500 staff
Uptycs
Uptycs is the leading cloud security platform for large hybrid cloud environments. We protect workloads wherever they run, while extending security visibility from development to runtime. That’s why enterprises like PayPal, Comcast, and Nutanix rely on Uptycs to secure their mission-critical workloads. First-generation CNAPP solutions don’t have all the data needed to manage and prioritize risk. With Uptycs, data is power! We have no trouble giving you deeper context so you can focus on what truly matters. Most CNAPPs can tell you if a vulnerable workload is exposed to the internet, but can they show you vulnerable packages running now, or three weeks ago, and if and how you were breached? Uptycs can. Uptycs brings teams together to optimize security operations, ensure compliance, and accelerate remediation across cloud workloads, containers, Kubernetes, and software pipelines – all from a single security console, policy framework, and data lake. Shift up your cybersecurity with Uptycs.
201 to 500 staff
Veracode
Veracode is a global leader in Application Risk Management for the AI era. Powered by trillions of lines of code scans and a proprietary AI-assisted remediation engine, the Veracode platform offers adaptive software security and is trusted by organizations worldwide to build and maintain secure software from code creation to cloud deployment. Thousands of the world’s leading development and security teams use Veracode every second of every day to get accurate, actionable visibility of exploitable risk, achieve real-time vulnerability remediation, and reduce their security debt at scale. Veracode is a multi-award-winning company offering capabilities to secure the entire software development life cycle, including Veracode Fix, Static Analysis, Dynamic Analysis, Software Composition Analysis, Container Security, Application Security Posture Management, Malicious Package Detection, and Penetration Testing.
501 to 1000 staff
Watchguard Technologies
WatchGuard® Technologies, Inc. is a global leader in unified cybersecurity. Our Unified Security Platform® approach is uniquely designed for managed service providers to deliver world-class security that increases their business scale and velocity while also improving operational efficiency. Trusted by more than security resellers and service providers to protect more than customers, the company’s award-winning products and services span network security and intelligence, advanced endpoint protection, multi-factor authentication, and secure Wi-Fi. Together, they offer five critical elements of a security platform: comprehensive security, shared knowledge, clarity & control, operational alignment, and automation. The company is headquartered in Seattle, Washington, with offices throughout North America, Europe, Asia Pacific, and Latin America. To learn more, visit WatchGuard.com.
1001 to 5000 staff
