A group of online consumer loans that were packaged into bonds is going bad faster than lenders and bond underwriters had expected, the latest sign that some startups that aimed to revolutionize the banking industry underestimated the risk they were taking.

Delinquencies and defaults are reaching key levels known as "triggers" for at least four different sets of bonds. Breaching those levels will force lenders or underwriters to start paying down the bonds early. Avant Inc. and its underwriters, for example, are going to have to begin to repay three of its asset-backed notes, according to a person with knowledge of the matter.

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