# Japan's Iwai Cosmo Securities Cyberattack Exposes 12 Stocks

> Japan's Iwai Cosmo Securities cyberattack exposed 12 stocks and 1.25 million shares through unauthorized trading.
- Title: Japan's Iwai Cosmo Securities Cyberattack Exposes 12 Stocks
- Summary: Japan's Iwai Cosmo Securities cyberattack exposed 12 stocks and 1.25 million shares through unauthorized trading. Japan's Iwai Cosmo Securities suffered a…
- Keywords: iwai cosmo securities, iwai cosmo holdings, trade works, japan financial services agency, market manipulation, cyberattack, unauthorized trading, thinly traded stocks, finance, markets, Japan's, Iwai
- Source: BigGo Finance — https://finance.biggo.com/news/6766feb1-32a1-4ee1-af5f-2f41308d7ac6
- Author: BigGo Finance
- Published: 2026-10-23T15:55:15+00:00
- Read time: 1 min
- Topics: iwai cosmo securities, iwai cosmo holdings, trade works, japan financial services agency, market manipulation, cyberattack, unauthorized trading, thinly traded stocks, finance, markets
## Unauthorized Trading Expansion
Iwai Cosmo Securities unauthorized trading expanded to 12 stocks and 1.25 million shares.
## Market Manipulation Suspected
Investigators suspect the cyberattack aimed to manipulate share prices for profit.
## Breach Detected on Oct 14
The cyberattack was detected on Oct. 14 with customer data viewable for 4,975 people.
## Unauthorized Orders Confirmed
Seven accounts had confirmed unauthorized orders with five executing trades.
## System Vulnerability Exploited
The attack exploited inadequate controls blocking external connections to the operator screen.
## Login Challenges Recorded
Over 7.3 million failed login attempts occurred from Oct. 15 to 17.
## Financial Services Agency Response
Japan's Financial Services Agency began interviewing securities firms to investigate similar breaches.
## Key takeaway

Japan's Iwai Cosmo Securities suffered a cyberattack that executed unauthorized trades on 12 stocks, 1.25 million shares, and 4,975 customers' data.