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C.S. LUMBER CO.,INC

C.S. Lumber is a vertically integrated timber and housing company operating across four segments: precut lumber processing (CAD design, machining, and sales for traditional and 2x4 wood-frame construction methods), wood-frame building contracting (detached housing and general wooden structures), real estate leasing (commercial and residential properties including childcare and welfare facilities), and residential land/home sales. The company differentiates through end-to-end capabilities spanning procurement, sawmilling, precut processing, logistics, and construction, supported by ISO certification and legal timber supplier accreditation. Its sustainability-focused business model leverages wood as a carbon-storing resource, targeting builders, contractors, and end-users primarily in the Japanese domestic market.

Market Cap

¥4.86B

US$31.0M

¥13.5B

US$85.9M

Stock¥2,628▼-0.27%

US$1 = ¥157.05 (2026-10-22)

LTM EV/EBITDA

7.5

LTM EV/EBIT

11.3

LTM PER

7.0

LTM PBR

0.4

Stock vs TOPIX (1Y, base=100)vs TOPIX ▼-39.3%pt

Oct 23, 25 – Oct 22, 26StockTOPIX

1Jul 17, 26Full-year FY2026/05 earnings announced

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Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

48%

52%

EquityD/E 1.09xDebt

Liquidity vs Debt 5Y (¥B)▼ Net Debt

CashInv. Sec.Debt

Shareholders

Top 10 hold 68.1%

as of 2026-05-31 · Source: Annual Securities Report

Chiyo Co., Ltd.

35.68%

INTERACTIVE BROKERS LLC (Standing Proxy: Interactive Brokers Securities Japan Inc.)

8.17%

Japan Securities Finance Co.,Ltd.

4.64%

Ueda Yagi Tanshi Co., Ltd.

3.73%

Seigo NAITO

2.99%

Chiyosuke NAKAI

2.74%

Shunsuke NAKAI

2.70%

Masasuke NAKAI

2.70%

Reiko NAKAI

2.70%

Nomura Securities Co., Ltd.

2.05%

Management

7 officers

Chiyosuke NAKAI

Representative Director, President

Apr 1973 Joined Nakai Lumber Store Co., Ltd. Jun 1976 Appointed Senior Managing Director of the same company Apr 1981 Chiba Branch Manager of the same company Apr 1983 Established Chiba Nakai Lumber Store Co., Ltd. (now C.S. Lumber Co., Ltd.); appointed Representative Director, President (current) Oct 2005 Appointed Representative Director, President of CLC Corporation Co., Ltd. (now C.S. Lumber Co., Ltd.) Dec 2007 Appointed Representative Director of Nanohana Housing Co., Ltd. (current) Jul 2011 Appointed Representative Director of Prost Co., Ltd. (now C.S. Home Co., Ltd.) (current) Feb 2012 Appointed Director of C.S. Logistics Co., Ltd. Jun 2018 Appointed Director of C.S. Material Co., Ltd. (current) Dec 2020 Appointed Representative Director of C.S. Real Estate Co., Ltd. (current) Dec 2020 Appointed Representative Director of C.S. Real Estate Leasing Co., Ltd. (current) Jun 2021 Appointed Director of C.S. Build Co., Ltd. (current) Jun 2022 Appointed Representative Director of C.S. Logistics Co., Ltd. (current) Feb 2026 Appointed Representative Director of Sanyo Construction Co., Ltd. (current)

1950-12-08

Shunsuke NAKAI

Senior Managing Director

Apr 2009 Joined Yuasa Quovis Co., Ltd. Jul 2016 Joined the Company Jun 2018 Appointed Director of C.S. Material Co., Ltd. Nov 2018 Sanbu Plant Manager; Togane Hazugara Plant Manager Jun 2019 Deputy Manager, Purchasing Department Aug 2020 Appointed Representative Director of C.S. Material Co., Ltd. Dec 2020 Appointed Director of C.S. Real Estate Co., Ltd.; appointed Director of C.S. Real Estate Leasing Co., Ltd. Jun 2021 Appointed Director of C.S. Build Co., Ltd. (current) May 2022 Appointed Executive Officer Aug 2022 Appointed Representative Director of C.S. Logistics Co., Ltd. (current); appointed Director of Nanohana Housing Co., Ltd. (current); appointed Representative Director of C.S. Home Co., Ltd. (current); appointed Representative Director of C.S. Real Estate Co., Ltd. (current); appointed Representative Director of C.S. Real Estate Leasing Co., Ltd. (current) Aug 2022 Appointed Director of the Company Sep 2022 General Manager, Manufacturing Department Jul 2023 General Manager, Purchasing Department Jun 2024 General Manager, Conventional Sales Department No. 1 Aug 2024 General Manager, Conventional Sales Department Aug 2025 Appointed Senior Managing Director of the Company (current)

1985-07-30

Eiichi ISHIZUKA

Director

Apr 1988 Registered as attorney-at-law (Chiba) Feb 2001 Appointed Director of Chiba Prefectural Council of Social Welfare May 2006 Appointed Statutory Auditor of On the Way Co., Ltd. (current) Apr 2012 Appointed Civil Mediation Commissioner, Chiba Summary Court and Chiba District Court Feb 2016 Appointed Member of the Research Review Committee, Chiba Medical Center (Independent Administrative Institution) Feb 2018 Appointed Director of the Company (current)

1953-03-23

Naomi KUMAKIRI

Director

Apr 1984 Joined Daito Trust Construction Co., Ltd. Apr 2001 Executive Officer and General Manager, Housing Sales Department, the company Jun 2004 Appointed Director and General Manager, Tenant Sales Division, the company Apr 2006 Appointed Managing Director, General Manager of Operations Division and General Manager of Legal Department, the company Apr 2011 Appointed Senior Managing Director and Executive Officer, General Manager of East Japan Sales Division, the company Apr 2012 Appointed Director, Senior Managing Executive Officer, General Manager of East Japan Sales Division and General Manager of Metropolitan Area Sales Division, the company Apr 2013 Appointed Representative Director, President and Executive Officer, in charge of Construction Business Division and Management Division, the company Apr 2016 Appointed Representative Director, President, in charge of Construction Business Division and Management Division, the company Mar 2019 Resigned as Representative Director, President, the company Jun 2019 Resigned as Director, the company Aug 2019 Appointed Director of the Company (current)

1958-09-26

Ichiro KIMIZUKA

Full-time Statutory Auditor

May 1983 Joined Chiba Sogo Bank (now The Keiyo Bank, Ltd.) Jun 2009 Branch Manager, Edogawa Branch, the bank Jun 2011 General Manager, Human Resources Department, the bank Jun 2013 Appointed Director and General Manager, Human Resources Department, the bank Jun 2016 Appointed Managing Director and Executive Officer, the bank Jun 2020 Resigned as Managing Director and Executive Officer, the bank Jun 2020 Appointed Representative Director, President of Working Staff Co., Ltd. Jun 2024 Resigned as Representative Director, President, Working Staff Co., Ltd. Jul 2024 Joined the Company; assigned to Administration Division Aug 2024 Appointed Statutory Auditor of C.S. Logistics Co., Ltd. (current); appointed Statutory Auditor of Nanohana Housing Co., Ltd. (current); appointed Statutory Auditor of C.S. Home Co., Ltd. (current); appointed Statutory Auditor of C.S. Material Co., Ltd. (current); appointed Statutory Auditor of C.S. Real Estate Co., Ltd. (current); appointed Statutory Auditor of C.S. Real Estate Leasing Co., Ltd. (current); appointed Statutory Auditor of C.S. Build Co., Ltd. (current) Aug 2024 Appointed Full-time Statutory Auditor of the Company (current) Feb 2026 Appointed Statutory Auditor of Sanyo Construction Co., Ltd. (current)

1961-02-24

Hiroyuki TAKEMATA

Statutory Auditor

Apr 1974 Joined Marubeni Corporation Apr 2000 Transferred to Marubeni Building Materials Co., Ltd. (now SMB Building Materials Co., Ltd.); General Manager, Finance and Accounting Department Oct 2001 Kyushu Branch Manager, the company Apr 2006 General Manager, Human Resources and General Affairs Department, the company Jun 2006 Executive Officer, the company Apr 2007 Nagoya Branch Manager, the company Mar 2013 Resigned from the company Apr 2013 Joined Toyo Tex Co., Ltd. Oct 2013 Appointed Deputy President and Director, Toyo Tex Co., Ltd. Oct 2017 Resigned as Deputy President and Director, Toyo Tex Co., Ltd. Oct 2017 Appointed Advisor, Toyo Tex Co., Ltd. Feb 2019 Appointed Statutory Auditor of the Company (current) Jan 2025 Resigned as Advisor, Toyo Tex Co., Ltd.

1952-03-29

Toshiei TAKESHIGE

Statutory Auditor

Apr 1979 Joined the National Tax Agency Jul 2017 Appointed Director, Itako Tax Office Jul 2018 Chief Instructor, Tokyo Training Institute, National Tax College Jul 2019 Secretary, Tokyo Training Institute, National Tax College Jul 2020 Appointed Director, Asakusa Tax Office Jul 2021 Retired from the same position Jan 2022 Registered as certified tax accountant Jun 2023 Appointed Part-time Statutory Auditor of Nisshin Medical Food Co., Ltd. (current) Aug 2024 Appointed Statutory Auditor of the Company (current)

1960-12-22

Large Shareholding Reports

No filings

Disclosures

No disclosures

Primary Source Filings

TDnet

2026-10-15

Q1 Earnings Flash

FY ending May 2027

C.S. LUMBER CO.,INC

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C.S. LUMBER CO.,INC

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