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Overview

Electric Appliances

DIAMOND ELECTRIC HOLDINGS Co.,Ltd.

Diamond Electric Holdings is a Japanese holding company operating through three core segments: Automotive Electronics, Energy Solutions, and Home Electronics. The company manufactures and sells automotive ignition coils and electrical components, solar power conditioners and hybrid battery storage systems, and electronic control devices for residential heating, cooling, and hot water systems. Its operating subsidiaries include Dia Zebra Electric Co., Ltd. and Diamond Electronics Co., Ltd., serving both domestic and international markets.

Market Cap

¥5.81B

US$37.1M

¥34.7B

US$221M

Stock¥457▼-0.65%

US$1 = ¥156.80 (2026-10-23)

LTM EV/EBITDA

6.1

LTM EV/EBIT

13.0

LTM PER

13.8

LTM PBR

0.4

Stock vs TOPIX (1Y, base=100)vs TOPIX ▼-40.4%pt

Oct 24, 25 – Oct 23, 26StockTOPIX

1Nov 14, 25Rise on MBO reports with Polaris Capital

MC → EV Bridge

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Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

27%

73%

EquityD/E 2.71xDebt

Liquidity vs Debt 5Y (¥B)▼ Net Debt

CashInv. Sec.Debt

Shareholders

Top 10 hold 32.2%

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

Custody Bank of Japan, Ltd. (Trust Account)

6.66%

Diamond Engineering Co., Ltd.

5.52%

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

5.24%

All Diamond Shareholders

4.30%

Daiwa Securities Co. Ltd.

2.69%

Rakuten Securities, Inc. (Joint Account)

1.85%

Tatsuro IKENAGA

1.81%

BNP PARIBAS LONDON BRANCH FOR PRIME BROKERAGE CLEARANCE ACC FOR THIRD PARTY (Standing Proxy: The Hongkong and Shanghai Banking Corporation Limited, Tokyo Branch)

1.76%

Toyosaka Sangyo Co., Ltd.

1.20%

Ueda Yagi Tanshi Co., Ltd.

1.13%

Management

7 officers

Yuri ONO

Representative Director, President, CEO and Group CEO

May 2005 Representative, Yurism Consulting Apr 2015 Representative Director, President, NST Co., Ltd. Jun 2016 Representative Director, President, Diamond Electric Co., Ltd. Oct 2016 Representative Director, President and CEO, Diamond Electric Co., Ltd. (current) Jun 2017 Representative Director, President and CEO; Group CEO, Diamond Electric Co., Ltd. Oct 2018 Representative Director, President and CEO; Group CEO, the Company (current) Jan 2019 Representative Director, President and CEO, Tabuchi Electric Co., Ltd. (now Diamond Zebra Electric Co., Ltd.) (current) Oct 2021 Representative Director, President and CEO, Zebra Electronics Co., Ltd. (current) May 2023 Representative Director, Yurism Consulting & Asset Co., Ltd. (current) Jan 2025 Representative Director, President and CEO, Polyhedral Human Resources Re-ignition Counterattack Co., Ltd. (current) Apr 2025 Representative Director, President and CEO, Diamond Craft Co., Ltd. (current)

1974-11-03

Takashi YOSHIDA

Director

Apr 1966 Joined Daito Press Industry Co., Ltd. Dec 1966 Senior Managing Director, Daito Press Industry Co., Ltd. Jul 1974 Representative Director, President, Daito Press Industry Co., Ltd. May 2014 Representative Director, Chairman, Daito Press Industry Co., Ltd. Jun 2016 Director, Diamond Electric Co., Ltd. Jun 2017 Director (Audit and Supervisory Committee Member), Diamond Electric Co., Ltd. Oct 2018 Director (Audit and Supervisory Committee Member), the Company May 2019 Director, Adviser, Daito Press Industry Co., Ltd. Jun 2020 Director, the Company (current) May 2021 Adviser, Daito Press Industry Co., Ltd. (current)

1943-11-13

Gaku OKAMOTO

Director

Apr 1996 Registered as attorney-at-law Apr 1996 Joined a law firm in Osaka City Mar 2004 Head, Okamoto Gaku Law Office Apr 2010 Co-Partner, Okamoto & Toyonaga Law Office (current) Jun 2016 Director, Diamond Electric Co., Ltd. Jun 2017 Director (Audit and Supervisory Committee Member), Diamond Electric Co., Ltd. Oct 2018 Director (Audit and Supervisory Committee Member), the Company Jun 2020 Director, the Company (current)

1968-04-02

Kaoru KOTANI

Director

Apr 1991 Joined Diamond Electric Co., Ltd. Apr 2016 Manager, Tottori Accounting Section, Accounting Department, Diamond Electric Co., Ltd. Aug 2020 Assistant Manager, Internal Audit Office, the Company (current) Apr 2025 Auditor, Hungary Diamond Electric Kft. (current) Jun 2025 Director, the Company (current)

1972-05-13

Shiro KASAMA

Director, Audit and Supervisory Committee Member

Apr 1977 Joined The Hyogo Sogo Bank, Ltd. (now The Minato Bank, Ltd.) Apr 1999 Joined Daiichi Kigenso Kagaku Kogyo Co., Ltd. Mar 2003 General Manager, Finance Department, Daiichi Kigenso Kagaku Kogyo Co., Ltd. May 2003 Director, General Manager, Finance Department, Daiichi Kigenso Kagaku Kogyo Co., Ltd. Mar 2004 Director, General Manager, General Affairs Department; in charge of Finance Department, Daiichi Kigenso Kagaku Kogyo Co., Ltd. Jun 2011 Full-time Audit & Supervisory Board Member, Daiichi Kigenso Kagaku Kogyo Co., Ltd. Mar 2019 Director (Audit and Supervisory Committee Member), Tabuchi Electric Co., Ltd. Jun 2020 Director (Audit and Supervisory Committee Member), the Company (current)

1955-03-15

Hideki OKUSHITA

Director, Audit and Supervisory Committee Member

Apr 1985 Joined The Taiyo Kobe Bank, Ltd. (now Sumitomo Mitsui Banking Corporation) Apr 2008 General Manager, Sumoto Corporate Banking Department and Sumoto Branch, The Taiyo Kobe Bank, Ltd. Apr 2011 General Manager, Tennoji Block, Sumitomo Mitsui Banking Corporation Apr 2013 General Manager, Senju-Tokiwa Block, Sumitomo Mitsui Banking Corporation Apr 2014 Deputy General Manager, Retail Business Promotion Department (Osaka), Sumitomo Mitsui Banking Corporation Oct 2014 Executive Officer, Kobe Tochi Tatemono Co., Ltd. Jun 2015 Director (part-time), Keihanshin Kogyo Co., Ltd.; Director (part-time), Kobe Building Management Co., Ltd. Jun 2016 Managing Executive Officer, Kobe Tochi Tatemono Co., Ltd. Jun 2017 Managing Director, Kobe Tochi Tatemono Co., Ltd. Jun 2020 Audit & Supervisory Board Member, Kobe Tochi Tatemono Co., Ltd.; Auditor (part-time), Keihanshin Kogyo Co., Ltd.; Auditor (part-time), Kobe Building Management Co., Ltd. Jun 2025 Director (Audit and Supervisory Committee Member), the Company (current)

1962-10-08

Masataka IRIE

Director, Audit and Supervisory Committee Member

Apr 1979 Joined Wako Securities Co., Ltd. (now Mizuho Securities Co., Ltd.) Aug 1999 Seconded to Wako Economic Research Institute, Inc. (now Japan Investment Environment Research Institute, Inc.) Apr 2012 Joined Diamond Electric Co., Ltd. Sep 2016 General Manager, Office of the President, Diamond Electric Co., Ltd. Jun 2017 Director (Audit and Supervisory Committee Member), Diamond Electric Co., Ltd. Oct 2018 Director (Audit and Supervisory Committee Member), the Company (current) Jan 2019 Auditor, Tabuchi Electric Co., Ltd. (now Diamond Zebra Electric Co., Ltd.) (current) Jun 2020 Auditor, Niigata Diamond Electronics Co., Ltd. (now Diamond Electronics Co., Ltd.) (current); Auditor, Diamond Electric Co., Ltd. Aug 2022 Auditor, Diamond Craft Co., Ltd. (current) Jan 2025 Auditor, Polyhedral Human Resources Re-ignition Counterattack Co., Ltd. (current)

1955-10-26

Large Shareholding Reports

Daiwa Securities Co. Ltd.

2026-10-06

4.14%→3.11%

Annual report (as of 2026-03-31): 2.69%

Evo Fund

2026-09-24

27.20%→26.18%

Resona Bank, Ltd.

2026-09-07

6.55%→5.86%

Evo Fund

2026-07-13

30.17%→29.61%

Evo Fund

2026-07-10

31.39%→30.17%

Hitoshi KATSUNO

2026-06-24

5.16%→4.09%

Correction filing (name/detail fix only) — ratio carried over from the original filing

Hitoshi KATSUNO

2026-06-24

5.16%→4.09%

Correction filing (name/detail fix only) — ratio carried over from the original filing

Resona Bank, Limited

2026-06-22

7.49%→6.55%

Nomura Asset Management Co., Ltd.

2026-06-22

2.61%→2.51%

Hitoshi KATSUNO

2026-06-19

5.16%→4.09%

Correction filing (name/detail fix only) — ratio carried over from the original filing

Hitoshi KATSUNO

2026-06-17

5.16%→4.09%

Evo Fund

2026-06-16

32.51%→31.39%

Evo Fund

2026-06-08

32.78%→32.51%

Nomura Securities Co., Ltd.

2026-06-05

2.77%

Evo Fund

2026-06-04

33.82%→32.78%

Evo Fund

2026-05-14

34.10%→33.82%

Evo Fund

2026-04-24

35.02%→34.10%

Evo Fund

2026-04-15

36.14%→35.02%

Daiwa Securities Co. Ltd.

2026-04-06

4.14%

Annual report (as of 2026-03-31): 2.69%

Resona Bank, Limited

2026-04-03

8.69%→7.49%

Evo Fund

2026-03-26

40.64%→36.14%

Evo Fund

2026-03-25

42.02%→40.64%

Evo Fund

2026-03-18

43.04%→42.02%

Evo Fund

2026-03-06

43.93%→43.04%

Evo Fund

2026-03-03

45.06%→43.93%

Evo Fund

2026-02-20

46.55%→45.06%

Evo Fund

2026-02-12

47.73%→46.55%

Evo Fund

2026-01-26

48.50%→47.73%

Evo Fund

2026-01-20

49.60%→48.50%

Diamond Engineering Co., Ltd.

2026-01-08

7.62%→6.94%

Annual report (as of 2026-03-31): 5.52%

Evo Fund

2025-12-19

20.28%→49.60%

Evo Fund

2025-12-03

18.89%→20.28%

Evolution Capital Management LLC

2025-12-03

—

Hitoshi KATSUNO

2025-08-21

5.16%

Correction filing (name/detail fix only) — ratio carried over from the original filing

Hitoshi KATSUNO

2025-08-20

5.16%

Resona Bank, Limited

2025-08-14

9.81%→8.69%

Disclosures

No disclosures

Primary Source Filings

EDINET

2026-10-06

Large Shareholding Report

DIAMOND ELECTRIC HOLDINGS Co.,Ltd.

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DIAMOND ELECTRIC HOLDINGS Co.,Ltd.

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