The litigation followed worldwide probes into currency manipulation that resulted in about $10 billion in fines for several large banks.

Morgan Stanley, Royal Bank of Canada and three other banks last week agreed to pay a total $111.2 million to settle a US lawsuit that accused them of maniputlating prices in the foreign exchange market. 

The settlements include: $50 million for Morgan Stanley; $15.5 million for RBC, Canada's largest lender; $18 million for Societe Generale; $17.2 million for Standard Chartered; and $10.5 million for Bank of Tokyo-Mitsubishi. The settlements were detailed in filings in the US District Court in Manhattan. All require judges approval. 

The banks denied wrongdoing. 

Fourteen of the 16 that were sued have reportedly settled, agreeing to shell out a combined $2.12 billion.

Investors accused banks of conspiring to rig key currency benchmark rates, through the use of online chat rooms.

Lawyers for the investors reportedly said Credit Suisse and Germany's biggest bank, Deutsche Bank, have yet to reach settlement.