Early-stage delinquencies ticked up at a handful of card issuers in March, which could be a bad sign for future credit trends.

The latest trust data from the major issuers, released Thursday, did show some improvement. However, a slight increase in the rate of loans 30 to 59 days past due at JPMorgan Chase & Co., Discover Financial Services and Bank of America Corp. was concerning to SunTrust Robinson Humphrey analyst John Stilmar. Delinquencies are considered a reliable indicator of future losses.

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