The authority is investigating whether Swedbank broke inside information rules by telling major shareholders that Swedish Television's investigative news program Uppdrag Granskning on money laundering allegations was about to be broadcast.
The broadcaster also revealed new information about how top Swedbank officials may have withheld information from American investigators, as well as connections between Swedbank and Donald Trump's former campaign chairman, Paul Manafort, whose company transferred almost one million dollars without notifying American authorities.
Swedbank CEO Birgitte Bonnesen called Wednesday's events "a very tough day for Swedbank, our employees and our shareholders." She added that the bank was cooperating with the Economic Crime Authority.
"The official offence refers to unlawful disclosure of inside information and aggravated swindling (fraud). As communicated before, and at this point in time, no individual or legal entity has been served suspicion of a crime," Bonnesen stated in a news release.