Not exactly. It would require them to release the terms of every deal. The methodology to evaluate these would not be required. In many sectors of the markets s

Not exactly. It would require them to release the terms of every deal. The methodology to evaluate these would not be required. In many sectors of the markets such services are alrady provided to the banks by vendors so the bank would merely have disclose the name of the security and just a few other bits. And yes, this would have a profound effect on proprietary trading. That's the whole point. It would disperse prop trading to smaller entities not subject to disclosure.