A major Wall Street trade group is lobbying to get legislation passed that would give trading firms, banks and institutional investors a greater say in how the U.S. The Securities Industry and Financial Markets Association (SIFMA) is making the case to lawmakers on Capitol Hill that the costs to implement and maintain market initiatives to its members, which include about 400 banks, brokers and asset managers, are significant, yet they have little input in crafting those rules. SIFMA has drafted the legislation and is looking for sympathetic ears, the people said.