“Transformation is no longer a discretionary investment but a competitive necessity.”

This Appledore Research note examines composable architecture in corporate and commercial banking. As digital-native competitors, open-banking mandates and embedded finance raise the pace of change, the monolithic cores that long gave banks stability are increasingly becoming the constraint on it.

We set out what composability is, and just as importantly what it is not, cutting through a term that is now applied loosely across the industry. We assess how it changes the risk and economics of transformation, how industry standardization efforts such as BIAN reinforce it, and where adoption is gaining real traction.

We also examine the practical path banks are taking, drawing on anonymized case studies that show how modernization can proceed without a high-risk core replacement.

Written for corporate banking leaders, CIOs, enterprise architects and transformation teams, the note offers a clear-eyed framework for sequencing modernization and deciding where composability should come first.