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Arai
Masaaki Arai
Rank #1739
JAPAN•Diversified•Real estate

Masaaki Arai

Net Worth
$2.357B
+1.12% (24h)
Masaaki Arai is the founder, president, and CEO of Open House Group, a prominent Tokyo-based real estate developer. Born on October 29, 1965, Arai, through his vision, transformed the real estate landscape in Japan. As of March 2026, his net worth is estimated at $2.7 billion, reflecting his success in the real estate industry. Arai's career began in 1987 at Unihouse Incorporated, and in 1997, he founded Open House Group. His approach focused on providing homes in major Japanese cities, with a motto of "Let's find a house in Tokyo." The company expanded to the U.S. to attract Japanese investors. This expansion further solidified his place as a key player in the industry.

How to read Masaaki Arai's profile

Public net-worth figures are estimates. They combine observable inputs—typically listed equity, disclosed transactions, and market prices—with editorial judgment where filings are incomplete (for example, private holdings, debt, or cross-holdings). For Masaaki Arai, we anchor the narrative to Real estate and Real estate, then update the headline number as markets move. The chart on this page is meant to show trajectory, not a certified balance sheet.

When you see $2.357B alongside global rank #1739, interpret it as our best synthesis of widely cited ownership and price signals—not a claim about cash on hand. Estimates can diverge from other publishers because of different treatment of options, trusts, charitable vehicles, or illiquid assets. We document the general approach in methodology and welcome corrections via corrections.

Country (JAPAN) and career milestones on this page are curated for reader context; they should be verified against primary sources when used for research. Editorial metadata for this profile is refreshed on a rolling basis, with deeper audits at least annually (last noted cycle: 2026).

Looking for depth? When available, the dossier and timeline sections below add long-form context beyond the headline number—prioritize those modules when evaluating claims about strategy, controversies, or philanthropic commitments.

The Full Dossier

Early Life

Masaaki Arai was born on October 29, 1965. Information on his early life and education is limited. He joined Unihouse Incorporated in 1987.

Rise to Success

In 1997, Masaaki Arai founded Open House Group. Under his leadership as President and CEO, the company focused on providing homes, with the aim of finding houses in Tokyo. The company went public in 2013 and has sold over 60,000 homes in the Tokyo metro area. Arai’s aggressive, unifying style has been compared to the warlords who unified feudal Japan. Open House Group reported $8.6 billion in annual revenue in the fiscal year ended September 2024. The company's success is partly attributed to its unique approach to land acquisition and sales strategies, focusing on customer needs and market demand. In 2025, Open House expanded its operations to the US property market.

Key Business Strategies

Arai's business strategy revolves around acquiring land and building houses, overseeing every step of the process. Open House focuses on land close to railway tracks or of irregular shapes, acquiring them at a lower cost. The company employs young people for land acquisition, increasing the frequency of visits to real estate agents. Open House differentiates itself by catering to specific needs and providing customized solutions, unlike traditional home builders. The company also uses data-driven sales strategies and accepts crypto payments.

Philanthropy

Open House Group is committed to sustainability, with initiatives to address climate change. It signed the "UN Sports for Climate Action Framework" and set goals to reduce greenhouse gas emissions. The company introduced a "CO2-free menu" for customers of its single-family homes, and expanded the supply of "carbon-free clean electricity" in Ota City Sports Park.

Career Timeline

2024

Revenue of $8.6 billion

Open House Group reached $8.6 billion in annual revenue.

2013

Open House Group Went Public

The company was listed on the stock exchange.

1997

Founded Open House Group

Established his own real estate development company, serving as President and CEO.

1987

Joined Unihouse Incorporated

Began his career in the real estate industry.

Philanthropic Impact

Environmental Sustainability$0

Sustainability Initiatives

Committed to addressing climate change by signing the UN Sports for Climate Action Framework

Environmental Sustainability$0

CO2-free Menu

Introduced a “CO2-free menu” for the customers who purchased the Group's single-family homes.

Net Worth History

In-Depth Analysis

Early Life

Masaaki Arai was born on October 29, 1965. Information on his early life and education is limited. He joined Unihouse Incorporated in 1987.

Rise to Success

In 1997, Masaaki Arai founded Open House Group. Under his leadership as President and CEO, the company focused on providing homes, with the aim of finding houses in Tokyo. The company went public in 2013 and has sold over 60,000 homes in the Tokyo metro area. Arai’s aggressive, unifying style has been compared to the warlords who unified feudal Japan. Open House Group reported $8.6 billion in annual revenue in the fiscal year ended September 2024. The company's success is partly attributed to its unique approach to land acquisition and sales strategies, focusing on customer needs and market demand. In 2025, Open House expanded its operations to the US property market.

Key Business Strategies

Arai's business strategy revolves around acquiring land and building houses, overseeing every step of the process. Open House focuses on land close to railway tracks or of irregular shapes, acquiring them at a lower cost. The company employs young people for land acquisition, increasing the frequency of visits to real estate agents. Open House differentiates itself by catering to specific needs and providing customized solutions, unlike traditional home builders. The company also uses data-driven sales strategies and accepts crypto payments.

Philanthropy

Open House Group is committed to sustainability, with initiatives to address climate change. It signed the "UN Sports for Climate Action Framework" and set goals to reduce greenhouse gas emissions. The company introduced a "CO2-free menu" for customers of its single-family homes, and expanded the supply of "carbon-free clean electricity" in Ota City Sports Park.

Data Sources & Methodology

Figures for Masaaki Arai are synthesized from the sources below and cross-checked against our net worth methodology. Estimates may lag market moves; see corrections to report discrepancies.

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