Global regulators are seeking to toughen curbs on how much business large global banks can do with each other as part of a push to prevent lenders from keeping risks too concentrated.

A "key lesson from the crisis is that material losses in one systemically important financial institution can trigger concerns about the solvency of other SIFIs, with potentially catastrophic consequences for global financial stability," the Basel Committee on Banking Supervision said today in a statement on its website.

The group said it wants input on how to strengthen so-called large-exposure limits that force banks to diversity the range of companies and other lenders they work with. The Basel group is drafting updated risk concentration limits as part of a third wave of measures to overhaul bank rulebooks since the financial crisis that followed the collapse of Lehman Brothers Holdings Inc.