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Overview

Nihon Suido Consultants Co.,Ltd.

Nissuicon is a Japan-based construction consulting firm specializing in water infrastructure, providing planning, investigation, design, and construction supervision services primarily for waterworks, sewerage, river management, and disaster prevention infrastructure. The company serves mainly public-sector clients including central and local government agencies, which account for approximately 93.5% of revenues, and has expanded into PPP/PFI-based operations and management services such as Water PPP concession projects. In addition to its domestic business, the company has an international presence through subsidiaries and branches in Indonesia, Singapore, the Philippines, and project experience in Southeast Asia, India, and Africa via JICA and ODA-funded engagements.

Market Cap

¥21.6B

US$138M

¥3.45B

US$22.0M

Stock¥1,845▼-0.86%

US$1 = ¥156.80 (2026-10-23)

LTM EV/EBITDA

1.5

LTM EV/EBIT

1.7

LTM PER

16.3

LTM PBR

1.4

Stock vs TOPIX (1Y, base=100)vs TOPIX ▼-54.5%pt

Oct 24, 25 – Oct 23, 26StockTOPIX

1Aug 14, 26Q2 FY2026/12 earnings announced

MC → EV Bridge

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Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

100%

EquityD/E 0.00xDebt

Liquidity vs Debt 5Y (¥B)▲ Net Cash

CashInv. Sec.Debt

Shareholders

Top 10 hold 64.8%

as of 2026-06-30 · Source: Annual Securities Report

KUBOTA CORPORATION

19.68%

Water and Regional Innovation Foundation

15.11%

ITOCHU Corporation

8.30%

Kurimoto,Ltd.

6.39%

Custody Bank of Japan, Ltd. (Trust Account)

3.38%

NOMURA INTERNATIONAL PLC A/C JAPAN FLOW (Standing Proxy: Nomura Securities Co., Ltd.)

3.20%

Ishigaki Maintenance Co., Ltd.

2.90%

Izumi SHINOHE

2.49%

THE HONGKONG AND SHANGHAI BANKING CORPORATION LIMITED - HONGKONG PRIVATE BANKING DIVISION CLIENT A/C 8028-394841 (Standing Proxy: The Hongkong and Shanghai Banking Corporation Limited, Tokyo Branch)

1.83%

The Master Trust Bank of Japan, Ltd. (Trust Account)

1.54%

Management

7 officers

Kiichi NOMURA

Representative Director, Chairman

Apr 1971 Joined the Company Dec 2003 Director, Head of Sewerage Division (concurrently Head of Eastern Sewerage Division) Dec 2005 Managing Director, Head of Sewerage Division (concurrently Head of Eastern Sewerage Division) Dec 2007 Director, Vice President Dec 2009 Representative Director, President Mar 2019 Representative Director, Chairman (current) Apr 2020 Chairman (Representative Director), Japan Sewerage Industry Federation for a Sustainable Society (current) Jul 2020 Chairman (Representative Director), Nisuikon Water Infrastructure Foundation (now Water and Regional Innovation Foundation) (current)

1948-09-30

Shinji NAKANISHI

Representative Director, President

Apr 1985 Joined the Company Apr 2019 Executive Officer, Head of Water Supply Business Division Mar 2021 Director, Executive Officer, Head of Sales Division Apr 2021 Director, Executive Officer, Head of Regional Headquarters (concurrently Head of Eastern Regional Department) Apr 2022 Director, Managing Executive Officer, Head of Regional Headquarters (concurrently Head of Eastern Regional Department) Apr 2023 Director, Managing Executive Officer, Head of Regional Headquarters Jan 2025 Director, Managing Executive Officer, in charge of Regional Headquarters Mar 2025 Representative Director, President (current) Jun 2025 President, National Association of Water and Sewerage Consultants (current)

1960-06-25

Koichiro HARU

Director (Audit and Supervisory Committee Member)

Apr 1984 Joined Central Consultant Co., Ltd. Jan 1994 Joined the Company Dec 2011 Executive Officer, Head of Sewerage Division (concurrently Head of Eastern Sewerage Business Division) Apr 2012 Executive Officer, Head of Sewerage Business Division Dec 2013 Director, Managing Executive Officer, Head of Business Division Mar 2019 Director, Managing Executive Officer, Head of Administration Division Mar 2021 Audit & Supervisory Board Member, the Company Sep 2021 Statutory Auditor, PT. DACREA Design And Engineering Consultants (current) Mar 2022 Statutory Auditor, NSC Tech Co., Ltd. (current) Mar 2022 Statutory Auditor, Sabo Engineering Co., Ltd. (current) Mar 2023 Director (Audit and Supervisory Committee Member), the Company (current)

1959-12-29

Naohito TANEICHI

Director, Managing Executive Officer

Apr 1986 Joined the Company Apr 2015 Executive Officer, Head of Sewerage Business Division Apr 2018 Executive Officer, Head of Sewerage Business Division (concurrently Head of Business Planning Department, Business Division) Apr 2019 Advisor, Sewerage Business Division Apr 2023 Managing Executive Officer, Head of Consulting Division Mar 2025 Director, Managing Executive Officer, Head of Consulting Division (current)

1961-05-08

Kenichi OGAWA

Outside Director

Apr 1977 Joined Tokyo Metropolitan Government Jul 2012 Director General, Bureau of Sewerage, Tokyo Metropolitan Government Sep 2013 President, Tokyo Sewerage Service Co., Ltd. Jun 2017 Chairman, Japan Pipe Rehabilitation Method Quality Assurance Association May 2018 Representative Director, Sewer Maintenance Cooperative Mar 2023 Outside Director, the Company (current) Jun 2025 Advisor, SPR Rental Co., Ltd. (current)

1953-04-12

Hirohisa TAKADA

Outside Director (Audit and Supervisory Committee Member)

Apr 1985 Joined Japan Development Bank (now Development Bank of Japan Inc.) Jun 2012 Audit & Supervisory Board Office Manager, Development Bank of Japan Inc. Jul 2019 Registered as Certified Public Accountant Nov 2022 Opened Hirohisa Takada Certified Public Accountant Office (current) Dec 2022 Registered as Certified Tax Accountant Mar 2023 Outside Director (Audit and Supervisory Committee Member), the Company (current) May 2023 Full-time Audit & Supervisory Board Member, PR TIMES, Inc. (current)

1962-10-25

Yuki MATSUDA

Outside Director (Audit and Supervisory Committee Member)

Apr 2004 Entered Legal Training and Research Institute of the Supreme Court of Japan Oct 2005 Registered as Attorney-at-Law Jan 2016 Joined Sunrise Law Office (current) Mar 2017 Outside Director, Nihon Aqua Co., Ltd. May 2017 Outside Director, AZ Kikaku Sekkei Co., Ltd. Feb 2021 Deputy Secretary General, Japan Federation of Bar Associations May 2022 Outside Director (Audit and Supervisory Committee Member), AZ Kikaku Sekkei Co., Ltd. Mar 2023 Outside Director (Audit and Supervisory Committee Member), the Company (current) Mar 2023 Outside Director (Audit and Supervisory Committee Member), Nihon Aqua Co., Ltd. (current) Dec 2024 Outside Director (Audit and Supervisory Committee Member), Temona Co., Ltd. (current)

1977-04-17

Large Shareholding Reports

NOMURA INTERNATIONAL PLC

2025-10-06

3.78%→2.44%

NOMURA INTERNATIONAL PLC

2025-09-04

3.83%→3.78%

Disclosures

No disclosures

Primary Source Filings

EDINET

2026-08-14

Semi-Annual Securities Report

Period: Jan 2026 – Dec 2026

Nihon Suido Consultants Co.,Ltd.

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Nihon Suido Consultants Co.,Ltd.

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