NEW YORK--(BUSINESS WIRE)--The US Federal Reserve's completion of rules for US globally systemically important banks' (GSIBs) additional capital holdings (or buffers) clarifies key inputs to how these buffers will be determined and which banks qualify as a GSIB, says Fitch Ratings in a new report. The rules leave open the potential that the buffers are included in the minimum hurdles required to be met in annual stress testing under the Fed's Comprehensive Capital Analysis and Review process. T