Penetration Testing Companies in Denmark 2025 (Reviewed)

• Regulatory context: Denmark’s digital economy and strict EU mandates GDPR, NIS2 make proactive security testing a business necessity.
• DeepStrike leads Denmark:
  • Hacker-led PTaaS model with 100% manual testing.
  • Continuous testing, unlimited retests, and transparent pricing.
  • Designed for audit-ready compliance and rapid onboarding.
• Key competitors: CSIS Security Group, Dubex Conscia Denmark, Trifork Security, ReTest, Improsec, and AppSecure all recognized leaders in Danish cybersecurity.
• Service scope: Web, mobile, cloud, OT/ICS, and DevOps-focused pentesting aligned with OWASP and NIST SP 800-115 frameworks.
• Compliance coverage: ISO 27001, CREST, PCI DSS, and NIS2 readiness integrated into testing deliverables.
• Evaluation criteria: Compare providers by services, pricing models, client sectors, certifications, and reporting clarity.
• Key takeaway: For Danish enterprises, DeepStrike’s manual-first, continuous PTaaS approach offers unmatched visibility, compliance assurance, and risk reduction in 2025’s evolving threat landscape.

Penetration testing pentesting simulates real cyberattacks on your systems to find vulnerabilities before criminals exploit them. In a landscape of rising ransomware and cybercrime, regular pentests give Danish companies a security advantage. For example, global data breaches now average $4.44M in damages, so identifying weaknesses early is a high ROI investment.

The EU’s new NIS2 Directive effective 2025 and GDPR also push companies to validate security. Performing periodic pentests helps Danish firms meet compliance NIS2, ISO 27001, PCI DSS, SOC 2 and protect critical infrastructure. 

In 2025 and beyond, the right pentest partner will tailor tests to your tech stack web, mobile, API, cloud, OT/IoT, industry finance, healthcare, energy, etc., and risk profile often via a continuous pentesting platform that embeds security into development cycles.

Denmark’s cybersecurity market is booming: analysts project 10% annual growth from $383M in 2025 to $622M by 2029 as companies invest over €100M in digital security by 2025. With over 65% of Danish firms prioritizing cyber defenses, choosing a top tier pentesting firm is critical.

In the sections below, we profile the leading penetration testing companies in Denmark, with DeepStrike highlighted as our top recommendation for its manual, high tech approach. Each firm has unique strengths from CSIS’s threat intel focus to Trifork’s secure DevOps expertise and we include a comparison table to help you decide which fits your needs.

Why Penetration Testing Matters in Denmark 2025

Denmark is one of Europe’s most digital countries, driving aggressive tech adoption in finance, healthcare, energy and government. This rapid digital transformation raises the stakes: cyber threats now outpace traditional ones, and even small vulnerabilities can cause big damage. Regular pentesting helps find those hidden gaps.

It also supports regulatory compliance for example, the EU NIS2 directive transposed in Danish law in 2025 requires critical sectors to perform security assessments, and many compliance frameworks ISO 27001, PCI DSS, SOC 2 explicitly call for validated penetration tests. In practice, hiring expert pentesters is a pragmatic way to meet these mandates.

Real world impact underscores the value: IBM reports the global average breach cost is $4.44M, and 80% of CIOs plan to boost security budgets. Pentesting prevents breaches by hardening defenses. Case studies show pentests uncover vulnerabilities like misconfigurations, broken authentication, or insecure APIs that automated scanners miss.

In short, pentesting not only validates your security controls, it also gives actionable fixes. For Danish enterprises facing tough competition and regulations, investing in pentesting now is a strategic move that pays off in audit readiness and avoided breach costs.

Leading Danish Pentesting Firms

Below we profile the top penetration testing providers serving Denmark. Each offers a range of services from external network tests and web/mobile app assessments to red team/assume breach engagements and social engineering but with different focuses and models. We include key certifications e.g. ISO 27001, CREST and client sectors. DeepStrike is listed first as our top recommended provider see About the Author below.

DeepStrike Hacker-Led Pentests & Continuous PTaaS

DeepStrike, a U.S.-based but globally active cybersecurity firm, ranks as our number one penetration testing provider in Denmark for 2025. Founded by top bug bounty hunters, DeepStrike takes a human-first approach all testing is 100 % manual, never relying solely on scanners.

Its Pentesting-as-a-Service PTaaS platform enables continuous, on-demand testing through a secure cloud dashboard. Organizations can launch tests anytime, track findings in real time, and access unlimited retesting for 12 months at no extra cost, a standout feature that simplifies long-term remediation and compliance tracking.

Services:

DeepStrike delivers comprehensive offensive security coverage tailored to modern DevOps environments:

• Web, Mobile, and Cloud App Pentesting
• Internal / External Network and Active Directory Security Tests
• API and Microservice Assessments
• Red Team & Social Engineering phishing, SMS, physical intrusion
• Continuous PTaaS Programs with automated scheduling, Jira / Slack integration, and live dashboards

Every engagement follows OWASP Top 10, NIST SP 800-115, and CREST methodologies. Reports map directly to ISO 27001, PCI DSS 11.3, SOC 2, and EU NIS2 compliance controls making DeepStrike especially useful for Danish and EU-regulated organizations.

Team & Certifications:

DeepStrike’s specialists hold elite credentials including OSCP, OSWE, OSCE, and CREST Registered Tester. Many are former top-ranked bug bounty researchers, bringing real-world adversarial experience that traditional consultancies rarely match.

Clients:

With 700 + global clients, DeepStrike serves startups, fintechs, energy providers, healthcare networks, and government agencies. Nearly 45 % of Fortune 500 companies have used DeepStrike services worldwide. The firm maintains a 5.0 / 5 Clutch rating and is Clutch-ranked number one globally in 2025 for penetration testing quality.

Pricing:

DeepStrike is transparent about costs external pentests start at around $5 K, while most full-scope projects fall in the $10 K $50 K range. Continuous PTaaS subscriptions include all retesting and compliance reporting under a fixed annual fee.

Why They Lead:

• Manual-First Accuracy: Every test is expert-led, uncovering logic and authorization flaws scanners miss.
• Continuous Validation: PTaaS model ensures new code and infrastructure changes are always tested.
• Unlimited Retesting: Free for 12 months, ensuring verified fixes and audit-ready assurance.
• Transparency + Speed: Engagements start within 48 hours; clients track progress in real time.
• Compliance Alignment: Built-in mapping for ISO 27001, SOC 2, PCI DSS, NIS2.

DeepStrike represents the modern, hacker-led evolution of penetration testing in Denmark combining offensive creativity, certified expertise, and continuous validation within one platform. For Danish organizations seeking hands-on, repeatable, and compliance-ready testing, DeepStrike is the clear top choice for 2025.

CSIS Security Group Enterprise Red Team & Threat Intelligence

CSIS Security Group, founded in 2003 in Copenhagen and now part of the Allurity group, is Denmark’s largest independent cybersecurity firm. It’s recognized for its Assume Breach red team operations, 24/7 SOC/MDR services, and advanced cyber threat intelligence.

The company delivers full-stack offensive security engagements including external/internal network tests, web app and Active Directory pentests, large-scale compromise assessments, and social engineering campaigns. It also provides OT/ICS security and specialized NIS2 advisory for critical sectors.

• Services:
  • Comprehensive enterprise-level security including red teaming, network/web/AD pentesting, compromise assessments.
  • Phishing and social engineering simulations, OT/ICS protection, and NIS2 compliance consulting.

• Pricing:
  • CSIS targets large organizations with enterprise-scale budgets.
  • Pricing is typically project-based, customized for continuous defense programs rather than one-off tests.

• Clients:
  • Primarily large enterprises and government organizations, including defense, energy, and financial sectors.
  • CSIS supports mission-critical clients such as law enforcement agencies, the FBI, and Europol.

• Certifications:
  • Holds CREST accreditation for incident response and ISO 27001 certification, ensuring alignment with global security and compliance standards.

• Strengths:
  • Leverages proprietary threat intelligence and veteran teams many ex-military or intelligence analysts to create realistic, high-impact red team exercises.
  • Its blend of offensive expertise and continuous monitoring makes CSIS a strong choice for organizations needing integrated pentesting and threat defense.
  • In practice, CSIS competes with firms like DeepStrike by offering pentests as part of an end-to-end enterprise security suite.

Dubex Conscia Denmark Full Spectrum Security Partner

Dubex, recently rebranded as Conscia Denmark, is a veteran Copenhagen-based cybersecurity firm with over 25 years of experience. Known for blending offensive testing with comprehensive managed services, Dubex delivers both proactive and reactive security at scale.

Its Offensive Security team performs external/internal pentests, web/mobile/API assessments, Active Directory audits, and classic social engineering engagements using the same creative techniques and tooling as real-world adversaries. The company also provides simulated attacks, threat emulation, vulnerability management, and secure development consulting aligned with GRC frameworks.

• Services:
  • Full-spectrum cybersecurity covering offensive testing network, app, AD, social engineering, threat emulation.
  • Defensive operations SOC/MDR, SIEM, incident response, and strategic advisory for risk management, compliance, and secure DevOps.

• Pricing:
  • Typically custom enterprise pricing, often bundled within managed security or advisory contracts.
  • Ideal for organizations seeking long-term engagements rather than standalone pentests.

• Clients:
  • Trusted by major Danish enterprises across telecom, healthcare, finance, and critical infrastructure sectors.
  • Recognized as a one-stop security partner for ongoing protection and assessment.

• Certifications:
  • Certified under ISO 27001 and holder of Denmark’s D-Seal privacy label, reflecting strong governance and data protection standards.

• Strengths:
  • Dubex’s key advantage lies in its service depth and integration.
  • By combining offensive expertise with 24/7 defensive monitoring, it enables clients to manage pentesting, detection, and incident response under one contract.
  • Its holistic approach appeals to enterprises seeking continuous security partnership, not just periodic testing.

Trifork Security DevOps-Embedded Pentesting

Trifork Security, based in Copenhagen, is the cybersecurity division of the Trifork Group, a leading Scandinavian IT engineering and software development firm.

The division focuses on application security and secure DevOps integration, helping organizations embed security throughout the software lifecycle. Its specialists conduct web, mobile, and API pentests, secure code reviews, cloud security assessments, and DevSecOps coaching for development teams.

• Services:
  • Comprehensive application and DevOps security, including web/mobile/API pentesting, cloud environment audits, secure code review.
  • DevSecOps enablement, and governance alignment with GDPR, SOC 2, and ISO frameworks.

• Pricing:
  • Typically custom-quoted and often integrated into larger IT or software development projects.
  • Designed for organizations seeking long-term, process-driven partnerships rather than ad-hoc testing.

• Clients:
  • Trusted by enterprises in finance, healthcare, and manufacturing.
  • Particularly those with stringent compliance and data protection requirements.

• Certifications:
  • Holds ISO/IEC 27001:2022 certification and conducts annual ISAE 3000/3402 audits, ensuring adherence to GDPR and SOC 2 standards.

• Strengths:
  • Trifork Security stands out for its DevSecOps-centric culture and disciplined, standards-driven approach.
  • As part of an established technology group, it bridges the gap between software engineering and cybersecurity.
  • The firm also organizes the annual Øredev Security Conference, reinforcing its role as an educator and thought leader in secure development.
  • Ideal for companies seeking embedded pentesting within continuous delivery pipelines and strong governance alignment.

ReTest Security Independent Pentesters

ReTest Security, based in Ballerup near Copenhagen, is a boutique cybersecurity firm specializing in manual penetration testing and vulnerability management. Known for its deep technical expertise and vendor-neutral stance.

ReTest delivers highly detailed and transparent assessments. Its services include external and internal infrastructure pentests, web/mobile/API testing, and comprehensive network audits all performed manually by seasoned testers.

• Services:
  • Focused offensive security testing, including infrastructure, web, mobile, and API pentests, vulnerability scanning and management, and remediation consulting.
  • ReTest emphasizes tool-agnostic, research-driven methodologies for authentic results.

• Pricing:
  • Flexible and mid-market friendly, reflecting the firm’s boutique size and custom engagement model.
  • Projects are typically quoted per scope, offering personalized value for Danish SMEs and mid-sized enterprises.

• Clients:
  • Serves a range of mid-market organizations across finance, manufacturing, and technology sectors in Denmark, providing tailored engagements with a hands-on approach.

• Certifications:
  • While not a large compliance-focused provider, ReTest’s credibility stems from its team’s proven vulnerability research and multiple public CVE discoveries, showcasing real-world technical skill.

• Strengths:
  • ReTest’s hallmark is its technical depth and independence.
  • The team is known for uncovering rare bugs, including local privilege escalation exploits, and producing clear, actionable remediation reports.
  • Clients value their honesty, flexibility, and ability to translate complex findings into practical solutions for internal teams.
  • Ideal for organizations seeking manual, research-driven pentests over automated or packaged testing.

Improsec A/S Advisory Pentest & Red Team

Improsec A/S, headquartered in Copenhagen, is a leading Danish cybersecurity advisory and pentesting firm known for its independent, vendor-neutral approach. The company blends strategic security consulting with hands-on technical testing,

Helping clients make informed decisions without vendor bias. Its services include web, network, and cloud pentesting, red team exercises, and cloud security assessments, all designed to identify real risks and guide effective remediation.

• Services:
  • Advisory-led penetration testing, red teaming, and cloud security assessments.
  • Improsec also advises clients on security architecture, tool selection, and risk management bridging strategy with deep technical testing.

• Pricing:
  • Positioned for startups and mid-sized enterprises, offering transparent and cost-effective engagements.
  • Pricing is project-based, balancing advisory value with hands-on technical delivery.

• Clients:
  • Serves a mix of startups, SaaS providers, and mid-market firms across Denmark seeking a partner that combines consulting depth with real technical execution.

• Certifications:
  • Improsec’s consultants hold senior-level certifications such as CRTP Certified Red Team Professional, OSCP, and cloud-specific credentials, ensuring high technical credibility.

• Strengths:
  • Improsec stands out for its balance of advisory expertise and technical precision.
  • The firm’s risk-based approach ensures pentesting is prioritized around business impact, not just compliance.
  • Clients value its independence, practical guidance, and ability to translate complex findings into actionable, strategic improvements.
  • Ideal for organizations needing both security strategy and hands-on pentesting from one trusted partner.

AppSecure Continuous PTaaS and Red Teaming

AppSecure, a global cybersecurity firm with a growing presence in Copenhagen, offers a modern Pentesting-as-a-Service PTaaS model designed for continuous security testing. The company promotes a hacker-led approach similar to DeepStrike integrated seamlessly into DevOps pipelines.

AppSecure’s testing portfolio includes web, mobile, API, and IoT pentests, as well as multi-channel social engineering covering email, phone, SMS, and physical intrusion simulations.

• Services:
  • End-to-end PTaaS and red teaming, providing continuous vulnerability discovery, on-demand pentests, insider threat simulations, and compliance-ready reporting for PCI DSS, ISO 27001, and SOC 2.
  • Developer-friendly dashboards and integrations streamline remediation and validation cycles.

• Pricing:
  • Flexible subscription-based or enterprise per-client plans, allowing organizations to choose between one-off projects and continuous testing subscriptions with unlimited retesting.
  • Reports are typically delivered within three weeks.

• Clients:
  • Serves a broad range of enterprise and technology-driven organizations.
  • Particularly those operating in fast-moving DevOps environments or requiring frequent, audit-ready assessments.

• Certifications:
  • AppSecure’s operations and methodologies align with leading compliance frameworks including PCI DSS, ISO 27001, and SOC 2.

• Strengths:
  • AppSecure’s key differentiators are speed, scalability, and integration.
  • Their PTaaS platform enables continuous testing and real-time remediation tracking, while their manual red teams uncover vulnerabilities often missed by automated tools.
  • Though newer in the Danish market, AppSecure is rapidly earning recognition as an agile alternative to legacy pentest providers, ideal for companies prioritizing continuous security and DevOps alignment.

Comparison of Top Danish Pentest Firms

Each company above has distinctive advantages. DeepStrike’s hacker origin story, manual heavy methodology and continuous testing platform set it apart. CSIS leverages vast experience and threat intelligence to secure critical national clients. Dubex/Conscia combines pentesting with a broad managed security portfolio.

Trifork Security brings Trifork’s engineering rigor, ISO discipline and secure DevOps focus. ReTest stands out for technical depth and clarity for Danish SMEs. Improsec’s strength is vendor neutral expertise with a risk based pentest approach. AppSecure focuses on agility and PTaaS flexibility for modern cloud environments.

How to Choose a Danish Pentesting Vendor

Selecting the right pentest provider involves balancing capabilities, compliance and cost. Here are key considerations:

• Scope & Expertise: Ensure the firm covers your technology stack. If you have mobile apps, ask about mobile penetration testing expertise e.g. mobile app pentesting solutions. For APIs or GraphQL, confirm they perform those tests. Vendors should mention standards like OWASP Top 10 and MITRE ATT&CK in their methodology. Check if they do internal network and cloud infra testing, OT/IoT security, and social engineering phishing, physical access.
• Regulatory Alignment: If you’re in finance, healthcare or handle payment data, ensure the test meets relevant standards PCI DSS 11.3, SOC 2, HIPAA, GDPR. Look for providers advertising compliance services e.g. ISO 27001 pentest requirements or NIS2 compliance pentesting in Denmark. DeepStrike explicitly links its retesting policy to compliance frameworks.
• Methodology: Prefer vendors who perform manual, human driven testing. Automated scanners miss logic flaws. Our table highlights which firms emphasize manual work DeepStrike, Improsec, ReTest, AppSecure all do. You might compare red teaming vs penetration testing approaches some providers offer both. Always clarify if penetration testing includes social engineering and insider scenarios, or is purely technical.
• Certifications & Trust: ISO 27001, CREST membership, or local accreditations like Trifork’s ISO certification, or CSIS’s CREST signal process maturity. Experience matters too: check if they’ve handled your industry. You can review independent feedback on sites like Clutch DeepStrike and others have high ratings.
• Pricing & Service Model: Decide if you need a one off test or an ongoing service. Traditional pentests often 1 3 month projects start around $5K for a basic external test. For continuous needs especially DevOps, consider a PTaaS subscription see Penetration Testing as a Service PTaaS. DeepStrike and AppSecure offer continuous testing with unlimited retests. Be wary of cheapest quotes, very low pricing may mean limited scope or junior testers.
• Reporting & Follow up: A good report should be clear, actionable and tailored to your audience, technical and executives. DeepStrike and others highlight compliance ready reporting. Also ask about retesting: it’s common to offer a free follow up test after fixes DeepStrike provides 12 months of free retesting. Clarify this upfront.

Common Pitfalls: Don’t mistake a vulnerability scan for a pentest vulnerability assessments identify known issues, while penetration tests simulate attacks see vulnerability assessment vs penetration testing. Avoid any firm that only runs tools or gives a checklist report. Also, failing to include your full scope e.g. forgetting cloud assets or subnets is a mistake; define all in your penetration testing RFP. And remember: pentesting is not one time set it and forget it. Regular retesting annually or after major changes is best practice.

Penetration testing is no longer optional for Danish enterprises it’s a strategic investment. With cyber threats on the rise and regulations tightening, companies need expert hackers to play offense for them.

Ready to Strengthen Your Defenses? The threats of 2025 demand more than just awareness; they require readiness. If you're looking to validate your security posture, identify hidden risks, or build a resilient defense strategy, DeepStrike is here to help.

Our team of experienced practitioners provides clear, actionable guidance to protect your business. Explore our penetration testing services to see how we can uncover vulnerabilities before attackers do. Drop us a line we’re always ready to dive in.

About the Author: Mohammed Khalil is a Cybersecurity Architect at DeepStrike, specializing in advanced penetration testing and offensive security operations. With certifications including CISSP, OSCP, and OSWE, he has led numerous red team engagements for Fortune 500 companies, focusing on cloud security, application vulnerabilities, and adversary emulation. His work involves dissecting complex attack chains and developing resilient defense strategies for clients in the finance, healthcare, and technology sectors.

FAQ

• What is penetration testing?
  • A penetration test pentest is an authorized, simulated cyberattack on your systems networks, applications, devices to find security weaknesses before attackers can exploit them.
  • It goes beyond a simple scan by having ethical hackers actively exploit vulnerabilities.
  • In Denmark, pentests help companies meet EU regulations and strengthen defenses. See What is Penetration Testing?

• Why do Danish businesses need pentesting?
  • Denmark’s stringent GDPR and new NIS2 laws make security testing essential.
  • Pentests validate that controls firewalls, authentication, encryption, etc. actually work.
  • They also protect your reputation and bottom line: fixing vulnerabilities early can avoid costly breaches the average global breach costs $4.44M.
  • Industries like finance, healthcare and energy heavily targeted by attackers are especially required by regulation and insurers to do pentests.

• How much does penetration testing cost in Denmark?
  • Pricing varies by scope and vendor.
  • A basic external network pentest often starts around $5,000–10,000. A full stack assessment internal networks, web/mobile apps, APIs can range $10K–50K+ depending on size.
  • Continuous PTaaS subscriptions like DeepStrike’s add regular testing for a monthly or annual fee.
  • Many Danish providers give custom quotes; ask if they have startup or SME packages. See our internal guide on penetration testing cost for benchmarks.

• How do we choose the best pentest company?
  • First, ensure the firm tests exactly what you need. Look at their methods human vs. automated, certifications ISO 27001, CREST, industry experience and reviews.
  • Compare deliverables: do they offer retesting? Is reporting compliance oriented? Weigh pricing models against service levels.
  • For guidance, see our checklist article on How to Choose Your Next Penetration Testing Vendor.
  • And feel free to interview multiple firms on their approach a good pentester will explain things clearly.

• How often should we do penetration testing?
  • Best practice is at least once per year, or after any major system change like new network architecture or application release.
  • Critical sectors may require more frequent tests semi-annually or quarterly.
  • Some companies with high risk run continuous pentesting PTaaS which continuously probes systems.
  • The key is to never let testing become out of date. Regular tests keep security current as threats evolve.

• What is the difference between penetration testing and vulnerability scanning?
  • A vulnerability scan is an automated check that flags known issues, unpatched software, default passwords, etc..
  • Penetration testing goes further: skilled testers try to actually exploit vulnerabilities including chained exploits and logic flaws to show how an attacker could gain access.
  • Think of scanning as broad reconnaissance, and pentesting as an actual simulated attack. Both are useful, but pentests give deeper insights into real risk.

• Does NIS2 or GDPR require pentesting in Denmark?
  • Yes. NIS2 EU directive enforced in Danish law requires essential service providers to implement technical and organizational measures, including regular security audits and tests.
  • While GDPR doesn’t explicitly say pen test, it mandates appropriate security, which typically involves ethical hacking of critical systems.
  • Additionally, many standards used in Denmark ISO 27001, PCI DSS 11.3, SOC 2 explicitly require penetration testing as part of compliance audits.