Preparation and transmission of information upon special call.
21.01
Special calls for information on controlled accounts from futures commission merchants and introducing brokers.
21.02
Special calls for information on open contracts in accounts carried or introduced by futures commission merchants, members of contract markets, introducing brokers, and foreign brokers.
21.02a
Special calls for machine-readable information.
21.03
Selected special calls--duties of foreign brokers, domestic and foreign traders, futures commission merchants, introducing brokers, and contract markets.