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Overview

Information & Communication

Cyber Security Cloud,Inc.

Cyber Security Cloud is a Japan-based cybersecurity company specializing in cloud-native web application security services, offering its flagship cloud-type WAF 'Kogeki Shadan-kun' (No.1 in domestic sales share and deployments) and WAF auto-operation service 'WafCharm' (No.1 domestic sales share in WAF managed operation services) across AWS, Azure, and Google Cloud platforms. The company also provides vulnerability management platform 'SIDfm', full-managed cloud security service 'CloudFastener', vulnerability assessment services, and AWS WAF Managed Rules distributed globally to over 100 countries via AWS Marketplace—one of only seven vendors worldwide authorized to do so. Its subscription-based model serves customers ranging from SMEs to large enterprises, leveraging proprietary AI technology and world-class cyber threat intelligence to deliver comprehensive, self-developed and self-supported security solutions.

Activists: SilverCape Investments Limited 9.50%

Market Cap

¥34.8B

US$222M

¥31.7B

US$202M

Stock¥3,450▼-10.74%

US$1 = ¥157.05 (2026-10-22)

LTM EV/EBITDA

24.0

LTM EV/EBIT

25.4

LTM PER

36.4

LTM PBR

7.7

Stock vs TOPIX (1Y, base=100)vs TOPIX ▲+53.2%pt

Oct 23, 25 – Oct 23, 26StockTOPIX

1Mar 31, 26SilverCape Investments Limited filed large shareholding report

2Apr 2, 26SilverCape Investments Limited changed stake (6.5%→8.0%)

3Apr 7, 26SilverCape Investments Limited changed stake (8.0%→9.5%)

4Oct 6, 26Opened emergency security consultation desk amid wave of corporate data breaches/cyberattacks

5Oct 15, 26Nikkei plunged on 'CoreWeave Shock' (US cloud firm bond crash), triggering selloff in AI-linked names

MC → EV Bridge

AI Briefing

Generating insights…

Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

95%

EquityD/E 0.06xDebt

Liquidity vs Debt 5Y (¥B)▲ Net Cash

CashInv. Sec.Debt

Shareholders

Top 10 hold 42.4%

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

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

10.28%

JICVGI Opportunity Fund No. 1 Investment Limited Partnership

9.31%

GMO internet group,Inc.

4.92%

Custody Bank of Japan, Ltd. (Trust Account)

4.00%

Morgan Stanley MUFG Securities Co., Ltd.

3.57%

GMCM VENTURE CAPITAL PARTNERS I INC (Standing Proxy: Kazuma HAMASAKI)

3.18%

Central Tanshi Co., Ltd.

2.46%

Toshihiro KOIKE

1.79%

THE BANK OF NEW YORK 133595 (Standing Proxy: Mizuho Bank, Ltd.)

1.56%

Aucfan Co.,Ltd.

1.34%

Management

8 officers

Toshihiro KOIKE

Representative Director, President and CEO

Apr 2006 Joined Recruit HR Marketing Kansai Co., Ltd. (now Recruit Jobs Co., Ltd.) Jul 2016 Director and COO, AppSocially Co., Ltd. Apr 2018 Representative Director, ALIVAL Co., Ltd. Jan 2021 Joined the Company; Head of President's Office Mar 2021 Representative Director, President and CEO, the Company (current) Mar 2021 CEO, Cyber Security Cloud Inc. (current) Mar 2023 Representative Director, Cyber Security Alliance (General Incorporated Association) (current) Oct 2024 Director, Security Camp Council (General Incorporated Association) (current)

1983-01-02

Yoji WATANABE

Representative Director, CTO

Apr 1998 Joined Alpha System Inc. Mar 2002 Joined Ascade Inc. Apr 2016 Joined the Company; CTO and General Manager, Web Security Business Division Dec 2016 Executive Officer, CTO and General Manager, Web Security Business Division, the Company Jun 2017 Director, CTO and General Manager, Web Security Business Division, the Company Dec 2020 Representative Director, Softec Co., Ltd. Jan 2021 Representative Director, President and CTO, the Company Mar 2021 Representative Director, CTO, the Company (current) Jun 2021 Director, Career Index Inc. (current) Oct 2024 Representative Director, Generative Technology Co., Ltd. (current)

1975-08-19

Masafumi KURATA

Director, CFO

Apr 2014 Joined Taiyo ASG LLC (now Taiyo LLC) Jul 2016 Registered as Certified Public Accountant Jul 2017 Joined the Company; Executive Officer, General Manager of Administration Division Mar 2019 Director, General Manager of Administration Division, the Company Dec 2020 Audit & Supervisory Board Member, Softec Co., Ltd. Mar 2021 Director, CFO, the Company (current) Mar 2021 Director, Softec Co., Ltd. Oct 2024 Director, Generative Technology Co., Ltd. (current) Feb 2025 Director, DataSign Inc. (current)

1991-08-30

Yoshinobu IKURA

Director

Sep 2006 Passed the National Bar Examination Dec 2007 Registered as Attorney-at-Law Apr 2008 Joined AZX Law Office May 2010 Joined Hiraka Law Office (now Kairos Law Office) Feb 2013 Opened Ikura Law Office; Representative Attorney (current) Dec 2015 Corporate Auditor, Waqoo Inc. (current) Dec 2016 Outside Director, the Company (current) Apr 2022 Corporate Auditor, HR Cloud Co., Ltd. (current)

1979-05-08

Hiroshi KURIHARA

Director

Apr 1978 Joined Fuji Xerox Co., Ltd. (now FUJIFILM Business Innovation Corp.) Oct 2004 Executive Officer and General Manager, Production Services Business Unit, Fuji Xerox Co., Ltd. Jun 2009 Director, Managing Executive Officer and General Manager, Sales Division, Fuji Xerox Co., Ltd. Jun 2014 Director, Senior Managing Executive Officer in charge of Sales Business, Fuji Xerox Co., Ltd. Jun 2015 President and Representative Director, Fuji Xerox Co., Ltd. Jun 2020 Chairman, Japan Telework Association (General Incorporated Association) Dec 2020 Established Kurihara Associates Inc.; Representative Director, President (current) Jan 2021 Director, GigWorks Inc. (current) Apr 2021 Director, Human Life Co., Ltd. (current) Mar 2023 Outside Director, the Company (current) Jun 2023 Director, ASTI Corporation (current) Jun 2024 Director, Sintokogio, Ltd. (current) Jun 2025 Director, Startia Holdings Inc. (current) Jun 2025 Advisor, Japan Telework Association (General Incorporated Association) (current)

1953-09-12

Daichi SEKI

Full-time Corporate Auditor

Apr 1994 Joined Tokai Bank, Ltd. Oct 2000 Joined Chuo Aoyama Audit Corporation (later Misuzu Audit Corporation) May 2006 Registered as Certified Public Accountant Apr 2007 Concurrent Lecturer, Graduate School of Global Business, Meiji University (current) Aug 2007 Joined Shin Nihon LLC (now EY Shin Nihon LLC) Nov 2017 Member, Task Force on Business Value Assessment of Intellectual Property, Intellectual Property Strategy Headquarters, Cabinet Office Sep 2020 Member, Working Group on Value Design Management, Intellectual Property Strategy Headquarters, Cabinet Office Mar 2021 Outside Corporate Auditor, the Company (current) Mar 2021 Corporate Auditor, Softec Co., Ltd.

1969-10-02

Ikuo MURATA

Corporate Auditor

Dec 1995 Joined Gulliver International Co., Ltd. (now IDOM Inc.) as Director Apr 1997 Managing Director, Gulliver International Co., Ltd. Apr 2000 Representative Director, G-One Financial Service Co., Ltd. Apr 2001 Representative Director and Vice President, Gulliver International Co., Ltd. (now IDOM Inc.) Apr 2007 Representative Chairman, G-One Credit Service Co., Ltd. Oct 2009 President and Representative Director, Murata Sakusen Co., Ltd. (current) Sep 2012 Corporate Auditor, Nextage Co., Ltd. (current) Mar 2013 Director, Snow Peak Inc. Jun 2017 Outside Corporate Auditor, the Company (current) Aug 2017 Representative Director, Snow Peak Glamping Inc.

1958-06-05

Kenta IZUMI

Corporate Auditor

Apr 2003 Joined Daiwa SMBC Securities Co., Ltd. (now Daiwa Securities Co., Ltd.) Dec 2009 Joined Citigroup Global Markets Japan Inc. (now Citigroup Securities Co., Ltd.) Sep 2010 Director and CFO, Fullspeed Inc. Oct 2011 Director and Vice President (COO and CMO), Fullspeed Inc. Jun 2015 Representative Director, Reliance Data Inc. (current) Sep 2015 Director, Tagpick Inc. (current) Sep 2016 Corporate Auditor, Gotanda Electronic Commerce Co., Ltd. (current) Sep 2017 Director, Bank of Innovation, Inc. Mar 2018 Outside Corporate Auditor, the Company (current) Oct 2018 Director, Vstudio Inc. Nov 2019 Director, AI Marketing Inc.

1979-08-02

Large Shareholding Reports

Sumitomo Mitsui DS Asset Management Company, Limited

2026-04-22

4.88%→3.50%

SilverCape Investments Limited

2026-04-07

8.00%→9.50%

SilverCape Investments Limited

2026-04-02

6.50%→8.00%

SilverCape Investments Limited

2026-03-31

6.50%

Sumitomo Mitsui DS Asset Management Company, Limited

2026-02-20

4.88%

Disclosures

No disclosures

Primary Source Filings

EDINET

2026-08-14

Semi-Annual Securities Report

Period: Jan 2026 – Dec 2026

Cyber Security Cloud,Inc.

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Cyber Security Cloud,Inc.

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