Deutsche Bank shares fell sharply in early European trading after police raided the bank's headquarters in Frankfurt.
The operation marks the latest in a series of searches conducted by German authorities at the lender over recent years, according to reports from Vilaggazdasag.
The market reaction was immediate, with investors pricing in renewed regulatory risk.
The raid underscores the persistent legal and compliance challenges facing Germany's largest bank, which has struggled to shake off its reputation for regulatory friction.
This development follows a recent period of volatility for the stock.
Shares had already come under pressure after the Frankfurt public prosecutor's office confirmed earlier searches at one of the bank's branches.