Japan Brokerage IwaiCosmo Hit With Unauthorized Trades

Japanese brokerage IwaiCosmo reports unauthorized trades after cyberattack on system operator Trade Works.

Oct 20, 2026

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Japan Brokerage IwaiCosmo Hit With Unauthorized Trades

Japanese brokerage IwaiCosmo reports unauthorized trades after cyberattack on system operator Trade Works.

In brief

Japanese brokerage IwaiCosmo reports unauthorized trades after cyberattack on system operator Trade Works. Japan brokerage IwaiCosmo Securities confirmed unauthorized client transactions following cyberattack on its trading system operator Trade Works. Originally reported by Nikkei Asia.

IwaiCosmo Securities

IwaiCosmo Securities

Japanese brokerage IwaiCosmo Securities reported unauthorized client transactions after cyberattack on its trading system operator Trade Works.

Client Accounts Restored

20261020N tradeworks logo

Affected client accounts were restored following breach at system operator Trade Works that compromised personal data on 4,975 people.

Data Breach Impact

Japan faces 'next big storm' as hackers use stolen data, warns Trend Micro

Cyberattack at Trade Works led to unauthorized trades in client accounts and personal data compromise for 4,975 individuals.

In short

Japan brokerage IwaiCosmo Securities confirmed unauthorized client transactions following cyberattack on its trading system operator Trade Works.

Read the original on Nikkei Asia

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