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We investigate whether the extent to which firms concentrate their borrowing from banks mitigates the credit contraction that followed the default of Lehman. Using micro data from a large sample of Italian firms, we show that firms borrowing from fewer banks and those with more concentrated borrowing suffer on average a smaller contraction in bank credit and have a lower probability of being credit-rationed. The results hold controlling for several firm-level characteristics and for the possible endogeneity of the measures of concentration of borrowing.