What Sohgo Security Services does

Sohgo Security Services Co., Ltd., operating under the ALSOK brand, is Japan's leading security services company, founded in 1965 and listed on the Tokyo Stock Exchange (ticker 2331). The company operates a 24/7 guard center (gādo sentā) integrating sensor-based mechanical monitoring, AI-powered image analytics, IoT devices, and rapid guard dispatch, with 10,000+ employees supporting a nationwide office network covering all major Japanese prefectures. Its service portfolio spans three core segments: security services (manned stationed and mobile guarding), security equipment (CCTV, access control systems across PR-C504/GTACS-II/OLM tiers, AI cameras, 3D laser radar, and the flagship ALSOK-G7 integrated system), and fire protection (including the recently acquired Japan Dry Chemical). Beyond these segments, ALSOK runs a large HOME ALSOK consumer business with 530,000+ home security contracts and 530+ municipal eldercare monitoring deployments, and operates adjacent service lines in cybersecurity SaaS (website tampering detection, information provision services S-861/858/859/860), facility management (Kanso acquisition), drone inspection, REBORG-Z security robotics, traffic guidance, and disaster monitoring (river, road, underpass).

The business model is overwhelmingly recurring-revenue and contract-based. Manned guarding operates on long-term corporate and government contracts; HOME ALSOK and information provision services run on monthly subscriptions; security and fire equipment is sold or leased; and training, AED, telegram, and stress-check services add professional services revenue. Go-to-market combines direct enterprise sales via security advisors who conduct on-site assessments, a 24/7 toll-free consumer line, an e-commerce shop (guardman-shop.com), and self-serve platforms (net-guardman.alsok.co.jp for guard booking, digitalsales.alsok.co.jp for IT security). Customer segments span individual consumers, corporate/commercial clients across all major industries, and government/public sector including landmark references such as Tokyo Skytree, the Tokyo 2020 Olympics, and the Kyoto and Akasaka State Guest Houses. Pricing is generally quote-based for enterprise, with disclosed price points only for standardized SaaS and training offerings.

Name

Sohgo Security Services

Legal name

ALSOK CO.,LTD.

Website

https://alsok.co.jp

Company type

Public

Founded year

1965

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

ALSOK is Japan's largest security services company, providing manned guarding, electronic security, fire protection, cybersecurity, and elder monitoring to corporate, government, and 530,000+ residential customers through a nationwide 24/7 guard center and integrated AI/IoT platforms.

Ownership category

akta.pro rank

Product category

Security Services

NAICS

Security Guards and Patrol Services (561612), Investigation, Guard, and Armored Car Services (56161), Security Systems Services (except Locksmiths) (561621), Security Systems Services (56162)

SIC

Services-Detective, Guard & Armored Car Services (7381), Services-Facilities Support Management Services (8744)

akta.pro primary industry

Security Operations Center (SOC) & Remote Video Guarding (VSOC) (BPABAMAF)

akta.pro secondary industries

Industrial & Critical Infrastructure Guarding (Utilities, Plants, Data Centers) (BPAKAAAD), Security, Safety & Fire/Life Safety Management (BPABAAAE), Fire Alarm & Life Safety Systems Integration (BPAKAGAF), Fire & Life Safety Services (Inspection/Testing/Sprinklers/Alarms) (IMAIAAAI)

Keywords

• Manned security services
• Electronic security systems
• Facility management services
• Home security monitoring
• Fire protection services

Headquarters

HQ city

Minato

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Supply Chain

Revenue model

1. Security Services (Manned Guarding): ALSOK's largest revenue stream, providing stationed (常駐) and mobile (巡回) security guards for commercial facilities, office buildings, government institutions, and events. Recurring revenue from long-term contracts, generating stable cash flows. Includes facility security (1号警備), traffic guidance, event security, and bodyguard (4号警備) services.
2. Security Equipment (CCTV, Access Control, Sensors): Sale and/or lease of electronic security equipment including the ALSOK-G7 system, AI cameras, 3D laser radar sensors, access control systems, intrusion detection sensors, and fire protection equipment. Customers include both corporate clients and individual homeowners.
3. Fire Protection Services and Equipment: Fire detection, alarm systems, fire extinguishing equipment, AED sales/rentals, and fire safety consulting services. ALSOK also acquired Japan Dry Chemical Co., Ltd. through a public tender, expanding its fire protection portfolio.
4. Cybersecurity and IT Security Services: Website tampering detection/response services (月額 ¥38,500/server), cybersecurity consulting, network monitoring, and information security solutions targeting corporate clients.
5. Home Security and Elderly Monitoring Services: Individual consumer services under the 'HOME ALSOK' brand, including home alarm monitoring, elderly safety monitoring devices (GPS tags, sensors, cameras), and care services. Revenue from monthly monitoring fees with over 530,000 home security contracts.
6. ALSOK 365 / Building Maintenance Services: ALSOK acquired Kanso Co., Ltd. (Sept 2024) to expand facility management (FM) services in the Kansai region. Building maintenance, equipment management, and related outsourcing services for corporate and commercial properties.
7. Telegram (電報) Service: ALSOK offers a telegram (祝電/弔電) delivery service for corporate and individual customers, with membership discounts and corporate logo customization options.
8. ALSOK School (Career/Education Training): Fee-based 3-day, 2-night training programs for corporate clients covering discipline, teamwork, emergency response, and self-defense skills. Offered at ALSOK Tokyo Training Center for ¥49,500 per person.

Pricing tiers

Go-to-market motion4 records

Distribution channels5 records

Marketing channels8 records

Core offering

Sohgo Security Services (ALSOK) provides integrated manned and electronic security services, including stationed and mobile security guards, home security and elderly monitoring under the HOME ALSOK brand, AI- and IoT-enabled surveillance systems, fire protection equipment and services, cybersecurity (website tampering detection), facility management, and disaster preparedness solutions. The company combines a 24/7 guard center with a nationwide branch network of offices and rapid dispatch capability, serving corporate, government, and individual customers across Japan.

Product overview

ALSOK (综合警備保障, Sohgo Security Services) operates a multi-brand product portfolio serving both individual and corporate customers. The residential brand HOME ALSOK provides home security systems (HOME ALSOK Connect, HOME ALSOK Premium), elderly monitoring services (みまもり tag, emergency notification devices), crime prevention support, and lifestyle support including cleaning and nursing services. The corporate segment offers ALSOK-G7, a flagship online mechanical guarding system with 24/7 monitoring and remote video access; information provision services (S-861, S-858/859, S-860) for business security; ALSOK AI camera systems with human detection; and the website tampering detection and recovery SaaS service. Beyond core guarding, ALSOK provides an extensive suite of add-on services including access control systems (PR-C504, GTACS-II, OLM SYSTEM), security robots (REBORG-Z), traffic guidance systems, AED management, key management devices, safety confirmation services, BCP consulting, disaster monitoring for rivers/roads/underpasses, drone inspection services, remote roll-call solutions for transport operators, confidential document destruction, pest control, cleaning, electrical/HVAC/fire equipment management, stress check services, cybersecurity training (ALSOK School), livestock disease prevention support, and energy storage systems. The portfolio spans physical security, cybersecurity, facility management, disaster preparedness, eldercare, and operational efficiency solutions.

Differentiator

Problem solved

Functional benefit

Brands

• HOME ALSOK: Personal/home security brand offering home security, elderly monitoring (mimamori), crime prevention support, and life support services to individual consumers.
• ALSOK杯王将戦 (ALSOK Cup Ōshō Tournament)
• ALSOKレスキュー (ALSOK Rescue)
• ニャルソック (Nyalsok)

Quantifiable outcome

• ALSOK has 530,000+ home security contracts as of March 2026
• +6 more outcomes

Named customers10 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Six partnerships are on record, tiered core, flagship and minor.

• Kanso Co., Ltd.coreStrategic or Co-development Partner · 4 September 2024ALSOK agreed to acquire Kanso Co., Ltd. from H2O Shopping Center Development Co., Ltd. in September 2024. The acquisition aims to expand ALSOK's Facility Management (FM) services in the Kansai region, address labor acquisition challenges, and improve productivity. This is part of ALSOK's strategy to diversify its services and increase overall corporate value. The acquisition was announced on September 4, 2024.
• Japan Shogi Association (日本将棋連盟)flagshipStrategic or Co-development PartnerALSOK serves as the special title sponsor of the ALSOK Cup 王将戦 (sponsored since April 2021), one of Japan's eight major shogi (chess) title tournaments with the second-longest history after the Meijin title. ALSOK and the Japan Shogi Association share common values around 'attack' and 'defense' strategy. The partnership enables ALSOK to reach millions of shogi fans nationwide through event sponsorship and brand association with the tournament's prestigious history.
• Tokyo SkytreeflagshipStrategic or Co-development PartnerALSOK is the official security partner (菁ティシャルパートナー) of Tokyo Skytree, one of Japan's most iconic landmarks. ALSOK provides comprehensive stationed and mobile security services for the tower complex. The partnership serves as a flagship reference for ALSOK's ability to secure complex, high-profile facilities and is featured prominently in ALSOK's corporate marketing materials.
• ALSOK Kyushu Co., Ltd. (ALSOK九州)coreOthersALSOK Kyushu Co., Ltd. is a group company holding '認定鳥獣捕獲等事業者' (certified wildlife capture operator) certification in Fukuoka Prefecture (License No. 004). ALSOK Kyushu supports wildlife damage prevention services for municipalities, providing trap installation, management, and wildlife culling operations in support of agricultural damage prevention in Kyushu.
• ALSOK Group Certified Wildlife Operators (9 subsidiaries)coreOthersALSOK Group has 9 subsidiaries (including ALSOK Co., Ltd. Tokyo No.005, ALSOK Fukushima, ALSOK Iwate, ALSOK Gunma, ALSOK Akita, ALSOK Chiba, ALSOK Miyagi, ALSOK Kanagawa, ALSOK Yamagata, and ALSOK Kyushu) that have obtained '認定鳥獣捕獲等事業者' (certified wildlife capture operator) certification from various prefectural governments, enabling the group to offer professional wildlife damage prevention and culling services across Japan.
• ALSOK Chiso Co., Ltd. (ALSOK日本食肉)minorOthersALSOK Chiso Co., Ltd. operates a gibier (game meat) processing facility in Chiba Prefecture (opened July 2020) as part of ALSOK's initiative to address agricultural damage from wildlife (approximately ¥400 million annual crop damage in Chiba). The facility processes wild boar, deer, and other game animals into food products, contributing to sustainable wildlife management and regional food supply.

Scale indicators9 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Secom Co., Ltd. Japan's #1 and #2 security services duopoly. Secom offers virtually the same product set as ALSOK — manned guarding, home security (SECOM Home Security), electronic security, fire protection, and disaster response — targeting the same Japanese corporate, government, and consumer segments. The two are routinely benchmarked head-to-head on stationed security share, home contracts, and municipal wins.
• ADT Inc. US-listed leader in monitored home and business security, with a large recurring monitoring subscriber base. Comparable to ALSOK's HOME ALSOK franchise in the consumer home security and monitoring business model (monthly fees, central station monitoring, guard/police dispatch).
• Central Security Patrols Co., Ltd. (CSP): Major Japanese manned-guarding and electronic-security company, also offering cash-in-transit and home security. CSP competes directly with ALSOK in stationed security contracts and ATM management, and is one of the top three Japanese security brands.
• Kokusai Security (Kokusai Buhei Co., Ltd.): Long-established Japanese security guard and patrol company with nationwide coverage. Kokusai competes with ALSOK for stationed and event security contracts across commercial, government, and infrastructure clients in Japan.

Emerging players

• Sodexo (Facilities Management): Global facilities management and food services major. Comparable to ALSOK's expanding ALSOK 365 / Facility Management business (Kanso acquisition) as both compete for outsourced building maintenance and integrated facility services contracts in Japan.

Broad incumbents

• Prosegur Cash / Prosegur Security: Spanish global security and cash-handling group offering manned guarding, electronic security, and cash-in-transit. Comparable to ALSOK's ATM management (74,000+ terminals) and security guard operations as a multi-vertical security services provider.
• Allied Universal: Global security services leader in manned guarding, electronic security, and risk consulting. Comparable as a broad incumbent offering integrated security solutions to enterprise and government customers, although Allied Universal's scale and global footprint far exceed ALSOK's Japan-only base.
• Securitas AB: Swedish global security services giant with deep presence in guarding, electronic security, and risk management. Comparable to ALSOK as a large, brand-led, multi-segment security services provider, but with much greater geographic diversification.
• Johnson Controls International: Global building systems and fire/security integrator, including fire alarm and life safety systems. Comparable to ALSOK's fire protection segment (post-Japan Dry Chemical acquisition) and integrated building security/FM offering.

Regional players

• ALSOK's Tokyu Security / Sohgo Security regional counterparts (combined regional Japanese security firms): Mid-sized Japanese regional security companies (e.g., Tokyu Security) competing with ALSOK in specific prefectures or vertical niches such as residential, railway, and small-business guarding. Useful as regional-pricing and share benchmarks in markets where ALSOK's national brand faces localized competition.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/alsoknow
• YouTubeyoutube.com/user/ALSOKofficial
• Facebookfacebook.com/ALSOK
• Instagraminstagram.com/alsokofficial

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries11 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A3 records

Investments2 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sohgo Security Services