Using a large loan sample from 1990 to 2006, we examine why firms form new banking relationships. Small public firms that do not have existing relationships with large banks are more likely to form new banking relationships. On average, firms obtain higher loan amounts when they form new banking relationships, while small firms also experience an increase in sales growth, capital expenditure, leverage, analyst coverage, and public debt issuance subsequently. Our findings suggest that firms form new banking relationships to expand their access to credit and capital market services, and highlight an important cost of exclusive banking relationships.