Securities Regulation in Federal States - Help Needed!

I am currently doing some research into the constitutionality of the proposed Canadian federal securities act, and would like to compare our situation with other federal states. I have covered off (I think) Brazil, Germany, Switzerland and the U.S., but would appreciate it if anyone could provide me with information about other countries, In particular, I would like to know if the constitutional basis for regulation at the federal (or state, or both) level. Any assistance will be appreciated and acknowledged.