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Overview

SEIYU KOGYO Co.,Ltd.

Seiyuu Kogyo operates primarily in the Greater Tokyo area across three integrated business segments: environmental services (approx. 54.7% of consolidated sales), construction (approx. 38.2%), and environmental engineering. The environmental segment handles collection, transport, intermediate processing, and recycling of construction-related industrial waste and contaminated soil, operating six intermediate processing facilities across Tokyo and Saitama and a fleet of 117 vehicles. The company's proprietary 'e Synergy System' creates a one-stop cycle in which waste generated at construction sites is recycled into building materials (recycled aggregate, improved soil, cement raw materials) and reused in the company's own civil engineering and road pavement works, providing a competitive advantage through vertical integration and high barriers to entry in the Tokyo metropolitan market.

Market Cap

¥—B

US$1 = ¥156.80 (2026-10-23)

LTM EV/EBITDA

—

LTM EV/EBIT

—

LTM PER

—

LTM PBR

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No price data

Stock data unavailable

This company is listed on a regional exchange (Nagoya/Fukuoka/Sapporo) and is not distributed via J-Quants (JPX). Stock price, market cap, and EV-based multiples are not available. Financial data from public filings (P&L, BS, directors, etc.) remains accurate for analysis.

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Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

46%

54%

EquityD/E 1.18xDebt

Liquidity vs Debt 5Y (¥B)▼ Net Debt

CashInv. Sec.Debt

Shareholders

Top 10 hold 96.0%

as of 2026-03-31 · Source: Annual Securities Report

Hosonuma Co., Ltd.

45.67%

Yorito HOSONUMA

23.74%

Nahoko HOSONUMA

9.44%

Odake Company Co., Ltd.

6.95%

Yamazaki Jari Shoten Co., Ltd.

4.69%

SEIYU KOGYO Co.,Ltd. Employee Stock Ownership Association

2.60%

Rie HOSONUMA

1.19%

THE SEIBU SHINKIN BANK

1.07%

The Tama Shinkin Bank

0.32%

Masatake MIYOSHI

0.32%

Management

7 officers

Yorito HOSONUMA

Representative Director, President

Dec 1988 Director, the Company Apr 1991 Joined Nikken Kaihatsu System Co., Ltd. Apr 1995 Joined the Company; Senior Managing Director Oct 1996 Representative Director, the Company Jun 1997 Representative Director, Seiyu Security Co., Ltd. Jul 2016 Chairman of the Board, Seiyu Security Co., Ltd. Nov 2018 Director, Seiyu Co., Ltd. (now Reiyu Kogyo Co., Ltd.) Dec 2019 Retired as Chairman of the Board, Seiyu Security Co., Ltd.; retired as Director, Reiyu Kogyo Co., Ltd. Dec 2020 President and Representative Director, the Company (current)

1967-06-05

Akio SHINTOMI

Director, Senior Managing Executive Officer, General Manager of Business Division

Apr 1981 Joined Tokyo Hosou Kogyo Co., Ltd. Apr 2007 Joined the Company Jun 2007 General Manager, Tama North Office, the Company Oct 2011 General Manager, Construction Business Division and General Manager, Tama North Office, the Company Dec 2013 Director, the Company Dec 2014 Deputy General Manager, Business Division and General Manager, Tama North Office, the Company Jul 2016 Director, Seiyu Security Co., Ltd. Oct 2016 General Manager, Construction Business Division, the Company Oct 2018 Director and Executive Officer, the Company Nov 2018 Director, Seiyu Co., Ltd. (now Reiyu Kogyo Co., Ltd.) Dec 2019 Retired as Director, Seiyu Security Co., Ltd.; retired as Director, Reiyu Kogyo Co., Ltd. Oct 2020 Director and Managing Executive Officer, the Company Oct 2023 Director, Senior Managing Executive Officer and General Manager, Business Division, the Company (current)

1962-09-12

Mamoru SAITO

Director, Managing Executive Officer, General Manager of Administration Division and General Manager of Corporate Planning Department

Apr 1990 Joined Yamaichi Securities Co., Ltd. Jan 1999 Joined PricewaterhouseCoopers Consulting Co., Ltd. (now IBM Japan, Ltd.) Jan 2002 Assigned to International Labour Organization and United Nations Industrial Development Organization under the Associate Expert Program of the Ministry of Foreign Affairs Jan 2005 Joined the Ministry of Foreign Affairs Oct 2006 Joined Shinko Securities Co., Ltd. (now Mizuho Securities Co., Ltd.) May 2011 Joined Tokai Tokyo Securities Co., Ltd. Apr 2017 Joined SBI Securities Co., Ltd. Sep 2017 Joined Takeei Co., Ltd. Feb 2019 Joined the Company Mar 2019 General Manager, Corporate Planning Department, the Company Oct 2019 Executive Officer and General Manager, Corporate Planning Department, the Company Oct 2020 Managing Executive Officer (in charge of IPO) and General Manager, Corporate Planning Department, the Company Dec 2020 Director and Managing Executive Officer, the Company (current) Dec 2021 General Manager, Corporate Planning Department and in charge of IPO, the Company Oct 2023 General Manager, Administration Division and General Manager, Corporate Planning Department, the Company (current)

1966-08-25

Eri IWABUCHI

Outside Director

Apr 2016 Joined Sumitomo Mitsui Trust Bank, Limited May 2016 Registered as attorney-at-law Feb 2019 Joined Proact Law Office (current) Dec 2022 Appointed Outside Director, the Company (current) Sep 2023 Audit & Supervisory Board Member, Pillbox Japan Co., Ltd. (current)

1990-02-09

Mayumi KOMORIZONO

Director, Full-time Audit and Supervisory Committee Member

Mar 1985 Joined the Company Jun 1997 Director, the Company Oct 2005 General Manager, General Affairs Department, the Company May 2007 Audit & Supervisory Board Member, the Company Nov 2014 Director and General Manager, General Affairs Department, the Company Jul 2016 Audit & Supervisory Board Member, Seiyu Security Co., Ltd. Oct 2018 Director and Managing Executive Officer, General Manager, Administration Division and General Manager, General Affairs and Planning Department, the Company Nov 2018 Audit & Supervisory Board Member, Seiyu Co., Ltd. (now Reiyu Kogyo Co., Ltd.) Jan 2019 General Manager, Administration Division, the Company Dec 2019 Retired as Audit & Supervisory Board Member, Seiyu Security Co., Ltd.; retired as Audit & Supervisory Board Member, Reiyu Kogyo Co., Ltd.; in charge of Personnel and General Affairs, the Company Oct 2020 Director and Executive Officer, General Manager, General Affairs Department, the Company Dec 2021 In charge of Safety, Quality and Environment Department, the Company Dec 2023 Director, Full-time Audit and Supervisory Committee Member, the Company (current)

1966-03-01

Keizo SHIMADA

Director, Outside Audit and Supervisory Committee Member

Apr 1973 Joined Ministry of Construction (now Ministry of Land, Infrastructure, Transport and Tourism) Jul 1992 Joined Emco Co., Ltd. Jul 1994 Joined Kajima Corporation Jul 2009 Advisor, the Company Aug 2011 Chairman, Construction Waste Cooperative Association approved by the Minister of the Environment and the Minister of Land, Infrastructure, Transport and Tourism Feb 2017 Outside Director, the Company Dec 2018 Outside Director, Audit and Supervisory Committee Member, the Company (current) May 2019 Retired as Chairman, Construction Waste Cooperative Association approved by the Minister of the Environment and the Minister of Land, Infrastructure, Transport and Tourism Oct 2019 Business Advisor, GMS Co., Ltd. (current)

1949-06-29

Sachiko ENDO

Director, Outside Audit and Supervisory Committee Member

Apr 1994 Registered as attorney-at-law and certified tax accountant Apr 1997 Attorney-at-law, Torikai Sogo Law Office Apr 2003 Attorney-at-law, Ogawa Sogo Law Office Apr 2006 Lecturer, Rikkyo University Law School Apr 2009 Principal, Veritas Law Office (current) Dec 2016 Audit & Supervisory Board Member, the Company Dec 2018 Outside Director, Audit and Supervisory Committee Member, the Company (current) May 2021 Outside Director, Nippon Zetock Co., Ltd. (current) Mar 2023 Outside Audit & Supervisory Board Member, CellSeed Inc. (current)

1954-02-17

Large Shareholding Reports

No filings

Disclosures

No disclosures

Primary Source Filings

TDnet

2026-08-06

Q3 Earnings Flash

FY ending Sep 2026

SEIYU KOGYO Co.,Ltd.

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SEIYU KOGYO Co.,Ltd.

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