On Tuesday, it also approved the takeover of BSI by a Zurich-based private bank, EFG International, under an agreement reached in February between EFG and BSI’s Brazilian owner, BTG Pactual. The authority said it had approved the deal on the conditions that BSI be completely integrated into EFG and dissolved within 12 months and that none of BSI’s top management associated with its misconduct take leadership positions in EFG.

EFG said in a statement that it believed Tuesday’s developments would “draw a line” ending regulatory uncertainty in Switzerland and Singapore for clients, employees, investors and other stakeholders.

The financial market authority said it had investigated 20 other Swiss banks and had started legal proceedings against six of them over transactions linked to either 1MDB or the Brazilian state oil company Petrobras, which has also been a subject of investigation by the Swiss authorities. BSI’s misconduct in its dealings with 1MDB “was particularly serious,” it said.

The Swiss attorney general’s office said in January that it suspected $4 billion earmarked for development projects in Malaysia had been misappropriated from 1MDB, citing cases involving companies in Malaysia and Saudi Arabia, and a United Arab Emirates sovereign wealth fund, “each involving a systematic course of action carried out by means of complex financial structures.”

In its business with 1MDB, the Swiss financial market authority said, BSI handled transactions for several foreign sovereign wealth funds amounting to hundreds of millions of dollars without adequately clarifying the money’s origins and helped to set up intermediate structures for handling the funds intended to increase the confidentiality of the transactions.

The sovereign wealth funds had constituted BSI’s most profitable group of clients, the financial market authority said, and generated fees that were above market rates. BSI’s senior management “did not question why the sovereign wealth funds should use a private bank to provide institutional services and pay excessive out-of-market fees for doing so,” the authority said.

It said the Swiss bank had also failed to apply adequate risk management procedures to business relationships “with politically exposed persons, the origin of whose assets was not sufficiently clarified and whose dubious transactions involving hundreds of millions of U.S. dollars were not satisfactorily scrutinized.”