Company

Matsui Securities Co., Ltd.

Matsui Securities Co., Ltd. (Chiyoda, Tokyo; Finance and insurance) appears in 2 related cybersecurity incidents. The latest was disclosed on 2025-03-25.

Profile

Industry/type: Finance and insurance
Location: Tokyo, Chiyoda
Listing: TSE Prime 8628
Website: https://www.matsui.co.jp/

Public figures

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Metric	Value	Scope	As of	Source
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Incident history

Disclosed 2025-03-25Updated 2026-01-14 16:33Tokyo[Contained][Severity: Critical][Breached][Critical]
Rakuten Securities, SBI Securities and others: accounts were taken over with phishing-stolen credentials, and holdings were sold to buy Chinese stocks
[Phishing][Credential abuse][Malware][Fraud][Financial loss]Organizations 6
Disclosed 2021-03-24Updated 2021-03-25 08:18Tokyo[Resolved][Severity: Critical][Through a supplier][Critical]
Matsui Securities: a former employee of its system contractor SCSK stole customers' IDs and passwords and illegally withdrew about 200 million yen from 15 customers
[Insider][Credential abuse][Data leak][Fraud][Financial loss]Leaked 210Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2025-03-25	2026-01-14 16:33	Rakuten Securities, SBI Securities and others: accounts were taken over with phishing-stolen credentials, and holdings were sold to buy Chinese stocks	[Breached]	[Critical]	[Critical]	6 Nomura Securities Co., Ltd., SBI SECURITIES Co., Ltd., Matsui Securities Co., Ltd., Monex, Inc., Rakuten Securities, Inc., SMBC Nikko Securities Inc.	Tokyo	[Phishing][Credential abuse][Malware]	[Fraud][Financial loss]	Unknown	[Contained]
2021-03-24	2021-03-25 08:18	Matsui Securities: a former employee of its system contractor SCSK stole customers' IDs and passwords and illegally withdrew about 200 million yen from 15 customers	[Through a supplier]	[Critical]	[Critical]	1 Matsui Securities Co., Ltd.	Tokyo	[Insider][Credential abuse]	[Data leak][Fraud][Financial loss]	210	[Resolved]