In this article the authors consider two recent decisions that illustrate how a US bankruptcy court and the English Court of Appeal (applying the EUIR to a pre-Brexit case) can analyse COMI in different ways. The decisions have implications for groups that need to restructure cross-border financing arrangements – particularly where financing has been raised by a “letterbox” company (SPV). Such companies may face greater challenges establishing that their COMI is in their jurisdiction of incorporation before a US bankruptcy court than they would in Europe.