Keystone Partners Co., Ltd

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Basic information

BASIC

Head office

1-2-1 Otemachi, Otemachi One Tower, Chiyoda-ku, Tokyo 100-0004

Chief executive

Tomoya Tsutsumi

Capital

80,000,000

Employees (non-consolidated)

Employees (consolidated)

Start date

2009-05-01

End date

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Websites

1 DOMAINS

Khttps://www.ksg-p.jp/

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Business

1

Management and operation of the Corporate Restructuring and Growth Support Fund (Investment Business Limited Liability Partnership)

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Related companies

0 COMPANIES

—

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Network

NETWORK

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Capital Customer Supplier Partnership Bank / shareholder Other Drag to move · click to open

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News

10 ARTICLES

2026-07-10

Loan to a Commercial Building Development Fund in Ginza

Keystone Partners' Japan Revival Sponsor Fund No. 6 Investment Limited Partnership will provide a mezzanine loan to ORCA GINZA7 LLC, a joint venture aimed at developing commercial buildings in Ginza, Chuo-ku, Tokyo. Sankou Asset Management is planning and structuring the fund, Gunma Bank is providing the senior loan, and Musashino Bank is providing the junior loan. Through this transaction, we aim to meet domestic and international tourism demand by offering high-quality dining experiences and more.

2026-07-06

Support Initiatives for Daikokuya HD Featured in NIKKEI Financial

The support initiatives for Daikokuya Holdings, a portfolio company of the fund operated by our company, were introduced in NIKKEI Financial. The article was published on July 6, 2026.

2026-04-23

Investment in Akihabara Hotel Development Fund

Keystone Partners' Japan Revival Sponsor Fund No. 6 Investment Limited Partnership invested in the Limited Liability Company Sumu Fund No. 3, which is developing an apartment hotel in Akihabara, Taito-ku, Tokyo. Sankou Asset Management planned and organized the project, and KSP also made an anonymous partnership investment with the company. The investment target is the "Sumu powered by Airbnb Partners" brand.

2025-10-02

Keystone Partners Invests in Airbnb Partners-Linked Hotel Development Fund

Keystone Partners, Inc. (KSP) operates the Japan Revival Sponsor Fund No. 6 Investment Limited Liability Partnership, which invested in the Apartment Hotel Development Fund through Peridot LLC. This fund collaborates with Airbnb Japan’s business community, Airbnb Partners, and targets hotels under the Sumu powered by Airbnb Partners brand as investment assets.

2025-09-16

Keystone Partners Decides to Invest in Ascentek

The fund operated by Keystone Partners Inc. has acquired a portion of Ascentek Co., Ltd.'s shares through LLC Ruby. The company plans to promote collaboration and enhance corporate value.

2025-07-07

Article on Completion of Share Transfer of Our Investment Target Published in Nikkei Electronic Edition

Recently, the share transfer of our investment target, Fujitsu i-Networks Systems Co., Ltd. (currently Yasaki Networks Systems Co., Ltd.), was completed, and an article regarding this matter was published in the Nikkei Electronic Edition.

2025-07-01

Keystone Partners Establishes Fund VI and Completes First Close

Keystone Partners, Inc. established the "Japan Revival Sponsor Fund VI Investment Limited Partnership" on July 1, 2025, and completed its first close. The firm plans to raise over 30 billion yen in total and will continue fundraising toward the final close.

2025-02-10

Consultation Cases on the Sale of Policy-Held Shares and Our Support

Amid growing societal demand for reducing policy-held shares, we provide sale support for non-public and illiquid listed shares through our fund. We have received inquiries from many industries and have launched a dedicated page featuring our support details and frequently asked questions.

2024-10-11

Keystone Partners Strengthens Efforts to Resolve Corporate Challenges Regarding Policy-Held Shares by Partnering with M&A Capital Partners

Keystone Partners, Inc. (KSP) has entered into an agreement with M&A Capital Partners (MACP) to introduce client companies for the purpose of resolving issues faced by companies holding policy shares or owning shares. In recent years, the review of policy-holdings has accelerated from the perspectives of capital efficiency and governance, and the sale of illiquid shares remains difficult. Since its founding in 2009, KSP has established five funds and achieved a cumulative investment execution amount of over 140 billion yen.

2024-09-10

Article Published on Toyo Keizai Online

An interview article about Keystone Partners Inc. was published on Toyo Keizai Online. The article was released on September 10, 2024, and introduces the company's initiatives and market trends.

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Public records

GOV

National Tax Agency basic information4010001134610

Source: National Tax Agency Corporate Number Publication Site, basic three items

Trade name

株式会社キーストーン・パートナース

Trade name (kana)

キーストーンパートナース

Name in English

Corporation type

301

Address

〒100-0004 東京都千代田区大手町１丁目２番１号

Postal code

1000004

Prefecture code

13

City code

101

Address outside Japan

Prefecture in English

City in English

Address outside Japan in English

Corporate number assignment date

2015-10-05

Update date

2022-02-03

Change date

2022-01-14

Registry closure date

Reason for registry closure

Successor corporate number

Details of the change

Latest record

1

Excluded from search

0

Processing type

12

Correction type

1

Trade name image ID

Address image ID

Sequence number

1722863

METI gBizINFO4010001134610

Source: gBizINFO (Ministry of Economy, Trade and Industry)

Corporate number

4010001134610

Trade name

株式会社キーストーン・パートナース

Trade name (kana)

キーストーンパートナース

Trade name (alphabet)

Registry closure date

Reason for registry closure

Registered address

東京都千代田区大手町１丁目２番１号

Postal code

1000004

Prefecture

東京都

Prefecture code

13

City or district

千代田区

City code

101

Street address

大手町１丁目２番１号

Organisation type

301

Processing type

12

Correction type

1

Status

Representative

Capital

Employees

Employees (male)

Employees (female)

Business summary

Website URL

Year founded

Business category

Date established

Unified government qualification - grade

Unified government qualification - business items

Update date

2022-02-03

Key information

4010001134610

§09

Sources & updates

SOURCES

SOURCEhttps://www.ksg-p.jp/company/

SOURCEhttps://www.ksg-p.jp/company/message/

NEWS ●https://www.ksg-p.jp/news/Collected

DOMAINOwn domain：Yes

UPDATED2026-11-03 14:22 · Model: gpt-oss-20b(16)