Inter-dealer brokers (IDBs) execute about half of all OTC derivatives trades occurring between dealers; the rest, the dealers trade directly between each other. Language in the House bill could give the IDBs the remaining 50 percent of the market in dealer-to-dealer OTC derivatives trading, according to Kevin McPartland, senior analyst at the Tabb Group. McPartland’s views agreed with that of an executive at a top derivatives trading IDB who had made the same claim to Securities Industry News in a background conversation occurring earlier in December.