What ARK does

ARK Co., Ltd. (アーク株式会社) is a privately held Japanese diversified services company headquartered in Morioka, Iwate Prefecture, with a secondary headquarters in Tokyo. Founded in February 1992, the company historically operated six business lines under a single corporate umbrella: (1) rent guarantee services for landlords and tenants, registered with the Ministry of Land, Infrastructure, Transport and Tourism; (2) authorized docomo and au mobile carrier shops; (3) Golf Partner retail stores selling golf equipment and apparel; (4) the Sumunavi real estate search portal covering six Tohoku prefectures; (5) solar power generation at four sites in Iwate and Aomori; and (6) NTT East broadband intermediation. The company derived revenue from carrier commissions, retail merchandise sales, subscription-based guarantee fees, and listing/portal marketplace economics. Geographic focus was originally Tohoku-centric, with subsequent nationwide expansion to 30 business locations across Hokkaido, Kanto, Kansai, and Hokuriku. Reported revenue was approximately ¥48.5B at the company level and ¥70B at group consolidated level, with roughly 300 employees. Representative Director is Oizumi Takeshi (大泉 毅).

On October 1, 2025, ARK executed a corporate restructuring via company split, establishing three new entities — Ark Mobile Co., Ltd. (mobile business), Ark Golf Co., Ltd. (golf retail), and Ark Group Holdings Co., Ltd. (group management) — while the original ARK Co., Ltd. retained the rent guarantee business as its core going-forward operation. Key channel partnerships include long-standing sales agency relationships with docomo Tohoku and KDDI (both since March 1992), an NTT East broadband partnership, a Sustainability Link Loan agreement with 77 Bank (December 2024), and a business partnership with SBI Nihon Small Amount Short Term Insurance (July 2024). The company holds METI's Regional Future Leading Enterprise designation and consecutive Health Management Excellence Corporation certifications (2024 and 2026). No AI/ML capabilities, proprietary technology platform, or outside institutional equity ownership is disclosed in the source material.

Name

ARK

Legal name

アーク株式会社

Website

https://arkgroup.jp

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

101–250 employees

Short description

ARK Co., Ltd. is a privately held Japanese diversified services company headquartered in Morioka, Iwate, operating rent guarantee, mobile carrier shops, Golf Partner retail stores, a Tohoku real estate portal, solar generation, and broadband intermediation across 30 nationwide locations, with ¥48.5B company-level revenue and ~300 employees.

Ownership category

akta.pro rank

Product category

Real Estate Services

NAICS

Rental and Leasing Services (532)

SIC

Services-Facilities Support Management Services (8744)

akta.pro primary industry

Property Management Advisory & Leasing Administration (FSAEAJAN)

Keywords

• Rent guarantee services
• Mobile carrier retail
• Golf retail stores
• Real estate portal
• Solar power generation

Headquarters

HQ city

Morioka

HQ country

Japan

HQ region

Asia

Offices26 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. 家賃保証事業 (Rent Guarantee): Core revenue stream from providing rent guarantee services to landlords and tenants in the real estate sector. Registered with the Ministry of Land, Infrastructure, Transport and Tourism (国土交通大臣(2)第30号).
2. モバイルショップ事業 (Mobile Retail): Operates docomo and au carrier shops, generating revenue from mobile device sales, service contracts, and commissions from telecom carriers.
3. ゴルファーショップ事業 (Golf Shop): Operates 'Golf Partner' retail stores selling golf equipment, apparel, and accessories. Revenue from merchandise sales.
4. ポータルサイト事業 (Portal Site): Operates the 'すむなび' real estate search portal covering Aomori, Iwate, Akita, Miyagi, Yamagata, and Fukushima prefectures. Revenue model likely includes listing fees from real estate companies and potentially advertising.
5. 再エネ事業 (Renewable Energy): Solar power generation at four locations in Iwate and Aomori prefectures, contributing to environmental conservation and regional community contribution.
6. ブロードバンド事業 (Broadband): As a member of the Japan Association of Telecommunications Services, handles sales and intermediation of NTT East's Hikari and other network products, along with telecommunications equipment sales.

Go-to-market motion2 records

Distribution channels5 records

Marketing channels6 records

Core offering

ARK Co., Ltd. operates a diversified portfolio of six business lines centered on residential and lifestyle services in Japan: Ark Rent Guarantee (a registered rent guarantee service for landlords and tenants), Mobile Business (authorized docomo and au carrier shops), Golf Partner (chain of comprehensive golf retail stores), Sumunavi (Tohoku regional real estate search portal), Renewable Energy (four solar power generation sites in Iwate and Aomori), and Broadband Business (NTT East Flet's Hikari and telecommunications equipment sales). Following an October 2025 corporate split, the original ARK Co., Ltd. continues operating the rent guarantee business as its core function.

Product overview

ARK Co., Ltd. operates a diversified business portfolio centered on real estate and telecommunications services across Japan's Tohoku region and beyond. The company operates six distinct business segments: (1) Ark Rent Guarantee - a core rent guarantee service for residential and commercial properties; (2) Mobile Business - authorized docomo and au carrier shops; (3) Golf Partner - a chain of comprehensive golf retail shops; (4) Sumunavi - a regional real estate search portal covering six Tohoku prefectures; (5) Renewable Energy Business - solar power generation at four locations; and (6) Broadband Business - NTT Flet's Hikari sales and telecommunications equipment. The company also sponsors the annual Ark Cup Match Play Golf Championship and supports local sports and athletes.

Differentiator

Problem solved

Functional benefit

Brands

• アーク賃貸保証 (Ark Rent Guarantee): Rent guarantee service for landlords and tenants in real estate contracts
• Golf Partner ( 골프 파트너)
• すむなび (Sumunavi)

Products and services

• Ark Rent Guarantee (アーク賃貸保証) Registered rent guarantee service providing coverage for landlords, tenants, and all parties in real estate contracts, offering life-plan support for housing transactions. Targets landlords, tenants, and property management companies primarily in the Tohoku region with nationwide expansion via 30 locations.
• Mobile Business (モバイル事業) Operation of docomo and au carrier shops providing mobile phone sales, contract services, and customer support for telecommunications subscribers in the Tohoku region.
• Golf Partner (ゴルフパートナー) Comprehensive golf shop chain operating 8 retail locations across Japan (Hokkaido, Iwate, Tokyo, Yokohama, Kanazawa, Nonoichi, Fukui), selling golf equipment, apparel, and accessories.
• Sumunavi (すむなび) Real estate search portal covering Aomori, Iwate, Akita, Miyagi, Yamagata, and Fukushima prefectures, connecting regional real estate companies with property seekers through rental and sales listings.
• Renewable Energy Business (再エネ事業) Solar power generation at four locations in Iwate (Shizukuishi, Morioka, Ichinoseki) and Aomori (Hachinohe) prefectures, contributing to environmental conservation and regional community development.
• Broadband Business (ブロードバンド事業) Sales and intermediation of NTT East Flet's Hikari and other network products as a member of the Japan Association of Telecommunications Services, including digital multifunction machines and business phone systems.

Quantifiable outcome

• Rent guarantee services provided across 6 prefectures in Tohoku and expanding nationally with 30 locations

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Eleven partnerships are on record, tiered minor, moderate and core.

• SBI日本少額短期保険株式会社minorStrategic or Co-development Partner · 23 July 2024Business partnership with SBI Nihon Small Amount Short Term Insurance for service enhancement in the rent guarantee or insurance domain.
• NTT東日本moderateTechnology or IntegrationAs a member of the Japan Association of Telecommunications Services (全日本電気通信サービス取引協会), ARK handles sales and intermediation of NTT East's Hikari and other network products. Long-standing relationship since 1997 with various NTT partnerships.
• docomo東北 (NTT東北移動体通信株式会社)coreChannel Partner/ Reseller/ DistributorSales agent for docomo mobile services since March 1992, operating multiple docomo branded shops.
• KDDI (東北セルラー株式会社現KDDI)coreChannel Partner/ Reseller/ DistributorSales agent for au mobile services since March 1992, operating au branded shops.
• 株式会社ティーガイアmoderateChannel Partner/ Reseller/ DistributorAgency partnership for mobile device and service sales since 2008.
• 株式会社オレンジラインcoreOthersRelated company under the ARK Group, involved in advertising and reuse businesses. Located in Iwate.
• アークホールディングス株式会社coreOthersHolding company overseeing the ARK Group's overall management. As of October 2025, the group was restructured with ARK Group Co., Ltd. as the holding entity.
• アークトラスト株式会社coreOthersRelated company handling rent guarantee business (家賃保証事業).
• 公益社団法人全国宅地建物取引業保証協会minorOthersMembership in industry associations for real estate transactions and guarantee services.
• 株式会社日本信用情報機構（JICC）moderateTechnology or IntegrationCredit information institution used for credit checks and risk assessment in rent guarantee underwriting.
• 岩手ビッグブルズmoderateGTM or Marketing PartnerSupport partner for the Iwate Big Bulls professional basketball team (B2 league). ARK supports the team as a local community initiative.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• athome Co., Ltd. Operates the athome real estate search portal covering regional Japan including parts of Tohoku. Comparable to ARK's Sumunavi as a regional-focused property listing platform with listing-fee economics.
• Casa Inc. Japan's largest publicly listed rent guarantee company (家賃保証). Directly comparable as a pure-play residential rent guarantee underwriter with national branch network; the most relevant listed benchmark for ARK's core business.
• Golf Partner Co., Ltd. Operates the Golf Partner chain of which ARK runs 8 stores. Directly comparable as the franchisor of ARK's golf retail business and benchmark for that segment's economics.

Others

• NTT East (Nippon Telegraph and Telephone East): Wholesale provider of the Flet's Hikari broadband products ARK resells. Comparable as the infrastructure backbone of ARK's broadband intermediation business.
• KDDI Corporation (au): Carrier partner of ARK's au shops. Comparable as the principal supplier of ARK's mobile retail revenue stream; relevant for understanding ARK's commission and traffic economics.

Broad incumbents

• LIFULL Co., Ltd. Operates Japan's major real estate portal LIFULL HOME'S and has rent guarantee adjacencies. Comparable as a real estate marketplace + related services platform; overlaps with ARK's Sumunavi portal and guarantee ecosystem.
• Recruit Holdings (SUUMO): Owner of SUUMO, the dominant Japanese real estate search portal. Comparable to ARK's Sumunavi portal in functionality and target audience, though at vastly larger scale.

Emerging players

• SBI Nihon Small Amount Short Term Insurance: Partner of ARK in rent guarantee/insurance service enhancement (announced Jul 2024). Comparable as an adjacent risk-bearing player in the rent guarantee ecosystem and a potential source of structural co-underwriting.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Instagraminstagram.com/gphakodatehiyoshigogo

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries6 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about ARK