Bank of America has set up a crisis team preparing for a possible dump of material about the bank by WikiLeaks.
Assange in November said he intended to "take down" a major American bank but did not specify which one.
The New York Times reported today that Bank of America has a team of 15 to 20 top officials sifting through thousands of documents, and trying to establishing if security has been compromised.
The bank has also hired consultants and spoken to law firms in preparation for any disclosures.
Among concerns is legal liability if private information about clients was to be disclosed.