In the confidential assessments, the Office of the Comptroller of the Currency said 11 of the 22 large banks it supervises have “insufficient” or “weak” management of so-called operational risk, said the people, who asked not to be identified because the information isn’t public.

That contributed to about one-third of the banks rating three or worse on a five-point scale for their overall management, the people said. The scores are the latest sign that US regulators are concerned about the level of risk at the country’s largest banks in wake of a series of failures last year.

Operational risk is one of the categories by which regulators evaluate overall risk at the banks they oversee. Each bank’s individual ratings are closely held, but regulators sometimes use aggregate data on banks’ grades to highlight areas of concern in discussions with other agencies and the industry.