"Finma has determined that the individuals concerned were directly responsible for serious regulation breaches," the body said in a statement following an investigation undertaken last year. It added management had failed to implement appropriate safeguards and monitor wrongdoing.
The regulator said it had identified serious organisational deficiencies and illicit behaviour not in the interest of clients at the bank which management had "tolerated, and at times encouraged".
Four other individuals received reprimands in a case which shook the financial world, while one case remains open, the Swiss regulator said.
Finma added that none of those investigated was still working at the bank.
Regulators in several countries had accused the traders of using internet discussion forums and instant messaging to manipulate the market.
Earlier this year, the Swiss Competition Commission (COMCO) said it was probing whether seven banks had colluded to manipulate prices in the precious metals market.
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