LONDON (Reuters) - Nasdaq OMX on Tuesday launched a cloud computing platform built by Amazon Web Services which it said would allow its trading clients to cut the cost of storing financial data. The system, FinQloud, is a response to regulators' growing demands that companies provide more granular data on their trading activities. Policymakers in the United States and Europe want banks and brokers to provide them with more detailed information on their day-to-day operations to help authorities spot illicit or risky trading patterns. ...