JP Morgan has the most to lose should the Basel Committee alter its systemic bank assessment methodology to fully reflect how difficult it would be to replace a firm that collapsed.

The global systemically important bank (G-Sib) assessment methodology uses five systemic indicator categories to gauge a firm's risk: size, interconnectedness, complexity, cross-jurisidictional activity, and substitutability.

Each bank's indicators are scored using a Basel-defined formula and their averages used