Disliked{quote} Retail brokers don't trade options for 500 mio. This info is provided to agnecies like Reuters, Bloomberg, MNI by bank dealers. Counterparties for options with larger notionals could be hedge funds or big companies. I traded plain vanilla and barrier options when I worked as risk manager for a company that was exporting a commodity. Volumes were not that large, but the information is available only for the banks and their customers.Ignored