The Frankfurt raid stems from findings in the so-called Panama Papers revealed in 2015.
In his new book, writer Jake Bernstein describes the web of accounts and how “it touches everything.”
Banks hope that a crackdown on the secrecy behind U.S.-based shell companies will make their jobs easier.
The government will pay up to $1.3 million for the data, and it probably won't be the last.
Last Ditch Effort: The Panama Canal and Peak Trade
Panama has just opened a new, wider canal, but less cause for celebration is its reputation as a go-to spot for hiding money.
The firm has denied wrongdoing.
The 'Panama Papers' leak sparks promises of a crackdown on offshore shell corporations and bank secrecy to hide the proceeds of corruption and criminal enterprises.
BBC World Service
A document leak reveals major companies and top leaders have been hiding their money through offshore accounts.
Xi Jinping is among 8 of China's top officials whose families own shell companies to hide their money.