Find a Pentest Company in Japan
There are 60 penetration testing companies in Japan. 49% are small firms (50 or fewer employees) and 51% are larger organizations.
GMO Flatt Security Inc.
Cybersecurity startup specializing in security assessments and penetration testing; 26 employees with 16.7% YoY growth since 2017; based in Shibuya, Tokyo, Japan; ranked #828,465 globally and #131,936 in country, offering expert security services and tools.
Cyber Defense Institute, Inc.
Cyber Defense Institute, Inc. is a Japan-based cybersecurity firm specializing in comprehensive security support, including vulnerability diagnosis, incident response, threat intelligence, and penetration testing; with 7 employees, founded in 2008, and known for its expertise in human-driven threat mitigation and security training.
NRIセキュアテクノロジーズ株式会社 / NRI SecureTechnologies, Ltd.
NRI Secure Technologies Ltd. is a Japan-based private cybersecurity company specializing in computer and network security, with 130 employees and $10M annual revenue; founded in 2000 in Chiyoda, Tokyo. The firm offers penetration testing, vulnerability assessments, security consulting, and managed detection and response services, leveraging extensive expertise to deliver world-class security solutions. It maintains a significant online presence with 122,940 monthly visits and ranks #274,144 globally, serving clients across various sectors.
EIRE Systems
EIRE Systems is a Japan-based private IT & Services company founded in 1996, with 74 employees and $20M annual revenue. It provides IT support, project management, and cybersecurity services, including penetration testing using PTES standards, with operations spanning APAC and offices in Tokyo, Hong Kong, Singapore, and Shanghai. The company has a global online presence and a reputation for delivering security solutions.
Powder Keg Technologies
Japanese cybersecurity firm founded in 2021 with 2 employees; specializes in penetration testing services with automated solutions like MUSHIKAGO; operates in a niche market with a global rank of #5,932,892 and 2,376 monthly visits.
Nihon Cyber Defence Co., Ltd.
Cybersecurity company specializing in threat intelligence, incident response, and penetration testing; 28 employees with +27.3% YoY growth; founded 2017; based in Chiyoda, Tokyo, Japan; provides advanced cyber resilience services to critical infrastructure, government, and global organizations.
（株）ユービーセキュア
（株）ユービーセキュア is a Japan-based private software development firm specializing in cybersecurity services, including penetration testing conducted by in-house consultants; 3 employees with +20% YoY growth, founded in 2007, headquartered in Minato, Tokyo.
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Ricerca Security, Inc.
Ricerca Security, Inc. is a Japan-based cybersecurity company specializing in defense technology, penetration testing, and security research; with 10 employees, founded in 2019, and recognized for its top security experts and active in vulnerability assessment, consulting, and training for government and Fortune 500 clients.
VLCセキュリティラボ
Cybersecurity and penetration testing company based in Japan; specializes in threat-led penetration testing, vulnerability assessments, and red team operations; founded in 2018 with $300K funding; small team of 1 employee; actively expanding internationally and involved in advanced security research.
Technica Zen
Business consulting and services company specializing in privacy, security, and compliance; provides penetration testing services and privacy solutions, with 2 employees, founded in 2015 in Ashiya, Japan, and offers products including cookiebot, secuvy, and securitia.
GMOサイバーセキュリティ byイエラエ株式会社
GMOサイバーセキュリティ byイエラエ株式会社 is a Japan-based private cybersecurity firm founded in 2013, specializing in penetration testing and red-team services; employs 28 staff with 25% YoY growth, and offers extensive pentest solutions across web, mobile, cloud, network, and IoT environments, with a strong web presence and active participation in cybersecurity events.
Mitsui Bussan Secure Directions, Inc.
Cybersecurity company specializing in security assessments, penetration testing, forensic analysis, and security consulting; 33 employees; Founded 2001; Based in Chuo, Tokyo, Japan; Offers professional security services including vulnerability diagnostics, digital forensics, and information leakage investigations; Official registration numbers confirm broad security audit and diagnostic capabilities.
KEKKAI Labs
KEKKAI Labs is a Japan-based blockchain security company specializing in Web3 audit, product penetration testing, and blockchain security solutions; founded in 2023, with $10.7M in funding, 2 employees, and a focus on Web3 fraud prevention and security services.
Barriercrack
Japan-based security company specializing in physical and cyber risk assessments; offers physical penetration testing services including physical intrusion simulations and hybrid attack evaluations; small team of 2 employees headquartered in Shibuya, Tokyo, with notable clients like ALSOK.
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株式会社ECSEC Laboratory
Cybersecurity company based in Tokyo, Japan, specializing in penetration testing, vulnerability analysis, and cybersecurity certification services; 5 employees with 11.1% YoY growth; offers intrusion testing on network devices, software, and LSI devices; maintains 1,788 monthly website visits and ranked #7,853,343 globally.
Gmo Internet Group, Inc.
Japan-based internet services and cybersecurity company; provides penetration testing (pentest) services as part of its security offerings; headquartered in Tokyo, Japan.
ネットエージェント株式会社
ネットエージェント株式会社 is a Japanese IoT and gaming security firm with 3 employees and $2M-$5M revenue, specializing in penetration testing, threat prevention, and security consulting for automotive, online gaming, and IoT sectors; headquartered in Sumida, Tokyo.
（株）エヌ・エフ・ラボラトリーズ
Japanese cybersecurity company based in Minato, Tokyo; provides penetration testing and vulnerability assessment services, confirming active security testing capabilities.
Gmo Internet, Inc.
Japan-based internet and cybersecurity company; offers penetration testing and risk management services; headquartered in Tokyo at 150-8512, Shibuya, Japan.
株式会社アイ・エフ・ティ（IFT）
Japanese cybersecurity firm providing vulnerability diagnostics and penetration testing; over 15 years of experience, 1,000+ assessments for major clients, 90%+ detection rate, offering web, app, platform security services, and source code analysis.
ITDIRECT
Japanese cybersecurity firm based in Chiyoda, Tokyo, providing penetration testing services for external/internal networks and applications; partners with ASV-certified vendors to reduce costs and strengthen security; employs AI-driven testing solutions for comprehensive vulnerability assessment.
Ｔｉｓソリューションリンク（株）
Japanese cybersecurity company headquartered in Shinjuku, Tokyo; specializes in penetration testing including hybrid diagnosis and external network scans, providing comprehensive security testing services to identify and address vulnerabilities.
Rayaegis Co., Ltd.
Japan-based cybersecurity firm specializing in penetration testing and vulnerability assessments; provides dedicated penetration testing services (侵入テスト) with a focus on security testing solutions across its Japanese and English platforms. Located at 東京都新宿区西新宿7-22-33 Polar西新宿 4階; domain rayaegis.co.jp.
アクセリア株式会社
Cybersecurity company based in Japan; specializes in penetration testing services with active security assessment capabilities, documented through service offerings, recent news, and case studies; 4 employees; Headquarters in Chiyoda, Tokyo.
Mitsui & Co., Ltd.
Japan-based multinational conglomerate with 2,651 employees and $97.9B revenue; operates globally in sectors including chemicals, coatings, cybersecurity, and business services; offers penetration testing services via Mitsui Bussan Secure Directions (MBSD), covering web, software, mobile, host/network, and IoT security assessments.
NTT DOCOMO BUSINESS
Japan-based IT services and consulting company with 982 employees and $7.4B revenue; offers penetration testing, vulnerability assessments, and security testing services including TLPT and VAPT; 1.9M monthly website visits, ranked #28,208 globally; competes with Lumen, Comcast, Verizon.
Almata
Almata is a Japan-based cybersecurity firm specializing in innovative, proactive security solutions for Japanese enterprises. The company offers penetration testing services that simulate real-world cyberattacks to uncover vulnerabilities, leveraging advanced technology and personalized security strategies to protect digital assets.
株式会社アイ・エフ・ティ
Japan-based IT solutions provider specializing in infrastructure and security; offers penetration testing services and active security solutions; located in Tokyo with a local contact number; maintains ongoing updates and partnerships, including a 2025 Palo Alto Networks certification.
サイバートラスト（株）
Cybertrust Co., Ltd. is a Japan-based cybersecurity firm headquartered in Minato, Tokyo, specializing in penetration testing services; offers security diagnosis and crowdsourced pentest solutions, demonstrating a focus on security testing and vulnerability assessment.
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GMO Security24
Cybersecurity company based in Japan; part of GMO Internet Group with HQ in Tokyo, Japan. Provides penetration testing, cyber-physical attack simulations, and brand security solutions; listed services include cyberattack countermeasures and security consulting, emphasizing comprehensive internet security.
Hitachi Solutions, Ltd.
Japanese IT and services company specializing in system integration, digital transformation, and cybersecurity; 172 employees with 203.3% YoY growth; provides penetration testing and security assessment services as part of its cybersecurity offerings, with a global presence and key subsidiaries in Asia, the US, and Europe.
C3Reve Co., Ltd.
Japanese cybersecurity company specializing in penetration testing and vulnerability assessments; over 100 client projects, 1,000 white-hat hackers, offering cloud and network pentests from ¥300,000 with 7-day start and 2-week results; headquartered in Tokyo, Japan.
NFLabs
Japan-based cybersecurity company headquartered in Chiyoda, Tokyo; specializes in penetration testing services with attack simulation and detailed security reports.
アイティーエム株式会社
Japanese cybersecurity company based in Tokyo; provides system monitoring, security services, and penetration testing including red-team exercises; offers 24/7 system operation monitoring, cloud, and network surveillance; established in Japan with a focus on enterprise IT security.
MAS Lab
Cybersecurity company based in Tokyo, Japan, specializing in penetration testing, security consulting, and Red Team exercises; offers services such as penetration tests, IoT diagnostics, and security organizational support, leveraging high technical expertise to provide professional security solutions.
Tokyo Techies
Tokyo Techies is a Japan-based private IT consulting firm founded in 2017, with 18 employees and 9.4% annual growth. They specialize in software development, AI, and cybersecurity, explicitly offering penetration testing services as evidenced by dedicated content and success stories. They develop products like klever suite for project management and provide consulting, SaaS, mobile/web app development, and AI system development. The company has 1,517 monthly website visits and ranks #9,559,641 globally.
C-Secure
Japan-based cybersecurity company headquartered in Tokyo; offers web vulnerability scanning, penetration testing, secure coding, remediation coaching, and e-learning services; specializes in vulnerability assessment and simulated intrusion testing to enhance business security and operational efficiency.
株式会社エスプール
Facilities services company based in Japan; specializes in outsourcing, human resources, disability support, logistics, and smart motor installation with 4 employees and 35.5% YoY growth. Founded in 1999, headquartered in Chiyoda, Tokyo, with active initiatives in sustainability, diversity, and management efficiency.
株式会社セキュリティイニシアティブ
Japanese cybersecurity company specializing in threat-based penetration testing (TLPT), vulnerability assessments, and security consulting; based in Japan with content in Japanese and a .co.jp domain.
Sola.com
Japan-based cybersecurity company headquartered in Sendai, Miyagi; specializes in penetration testing services including web application and infrastructure pentests; provides security consulting and technology solutions.
Trend Micro
Cybersecurity software development company based in Tokyo, Japan, with 4,553 employees and $1.8B annual revenue; offers enterprise cybersecurity platform with AI and threat intelligence; provides penetration testing services via Trend Vision One Red and Purple Teaming for active security testing; competes with Avast, Mandiant, Secom.
ストーンビートセキュリティ Stonebeat Security
Japanese cybersecurity firm with 3 employees headquartered in Chiyoda, Tokyo; specializes in penetration testing and vulnerability assessments to identify security risks from an attacker’s perspective; offers services in sports injury prevention and kinesiology, with a web presence of 2,631 monthly visits and a global rank of #5,639,196.
CyberCrew
Japanese cybersecurity firm specializing in penetration testing and security assessments; part of the S-Pool group with headquarters in Tokyo, Japan. Offers attacker perspective testing, continuous vulnerability management, and dark web monitoring; recognized with Hack The Box Business CTF 2022 & 2023 titles and HTB Dante certification.
MICROWAVE
Japan-based IT services and consulting company specializing in web development, digital strategy, and system development; 10 employees with 30.8% YoY growth; offers penetration testing, vulnerability assessments, and security improvements, indicating active security testing capabilities.
NEC
Japanese multinational IT corporation headquartered in Tokyo, Japan; provides cybersecurity services including penetration testing to evaluate system vulnerabilities; known for innovation in digital technology and security solutions.
株式会社スリーシェイク
Japan-based cybersecurity firm 株式会社スリーシェイク (3-shake Inc.) headquartered in Shinjuku, Tokyo; specializes in penetration testing and security diagnostics, offering active testing services including vulnerability assessments and penetration tests.
GRCS
Japan-based private IT and services company specializing in cybersecurity and penetration testing; offers manual and AI-driven pentest services via RidgeBot platform, with case studies showcasing expertise; 39 employees, $17.3M revenue, founded 2005, market cap JPY1.9B, last funding in 2019.
Alphanet
Alphanet is a Japan-based private IT & Services company founded in 1999, with 12 employees and JPY 9.3 billion in annual revenue. It provides total support for IT infrastructure, including cybersecurity training, network solutions, IT outsourcing, and penetration testing services; 12 employees, founded 1999, headquartered in Japan, part of Otsuka Shokai. The company specializes in security testing, including penetration tests, and serves a broad range of IT support functions.
株式会社NTTデータ先端技術
Japanese cybersecurity company specializing in penetration testing and security assessments; provides Threat Led Penetration Testing (TLPT) and PCI DSS compliance testing, with active security testing services demonstrated through detailed service pages and descriptions.
Hitachi
Japanese multinational conglomerate based in Tokyo; offers cybersecurity services including penetration testing through Hitachi Cyber, with documented active engagements in security testing for public and private sector clients.
Terilogy Co., Ltd
Japanese cybersecurity firm headquartered in Tokyo; provides penetration testing, vulnerability assessments, and red team services, actively engaged in security testing collaborations and events.
インフォセックアドバイザリー株式会社
Japan-based cybersecurity consulting company headquartered in Tokyo; provides penetration testing, ISO certification support (ISO27001, ISO27017, ISO42001), NIST compliance assistance, and security outsourcing; known for experienced consultants and comprehensive security services.
lanjut
Japanese cybersecurity firm specializing in penetration testing; provides high-quality, manual security assessments with OSCP/CEH-certified engineers, emphasizing cost-effective and thorough vulnerability detection for web and app security.
NTT DATA
Japan-based IT services and consulting company with 27,971 employees and $31.7B revenue; provides penetration testing, vulnerability assessments, breach simulations, and offensive security services to enhance cybersecurity resilience. Part of NTT Group, headquartered in Tokyo.
株式会社Ikotas Labs
Japanese security company specializing in vulnerability diagnosis and penetration testing; led by security engineers with experience in global hacking contests and security conferences. Based in Japan; founded by CEO Satoki Tsuji and COO Yuichi Sugiyama.
TopTech Informatics
Japan-based IT services provider specializing in cybersecurity and penetration testing; headquartered in Tokyo, Japan, with a focus on disruptive innovation and strategic IT solutions for SMBs. Offers infrastructure management, application development, and industry-specific services, emphasizing continuous penetration testing.
AUTOCRYPT Co., Ltd.
Japanese cybersecurity firm specializing in automotive security; offers penetration testing, vulnerability analysis, and fuzzing solutions; based in Japan with active market presence in Korea; founded before 2026.
TSK Cyber Security
Cybersecurity company based in Tokyo, Japan, specializing in penetration testing services; offers TANUKI penetration testing with promotional discounts and participation in industry events; established presence in cybersecurity testing market.
合同会社Peparoni
Japanese limited liability company specializing in cybersecurity penetration testing; offers penetration tests, red team operations, and vulnerability assessments for web applications and networks, as detailed on their Japanese-language homepage.
RCS Cybersecurity
Japan-based cybersecurity firm specializing in penetration testing and vulnerability assessments; offers comprehensive security testing with internationally certified red team and penetration testing experts, including OSCE, OSEP, OSCP, and OSWP; headquartered in Tokyo, Japan.