Zions Bancorp on Tuesday said it sold the remainder of its collateralized debt obligation securities, a type of bundled-debt investment that has plagued the regional lender.

During the second quarter, the Salt Lake City bank sold a total of $574 million of CDOs for proceeds of $437 million, resulting in a pretax loss of $137 million. Zions had previously said it had sold $81 million of CDOs through June 1, which is included in the $574 million total for the quarter.

The sale represents a moderate improvement relative to the carrying value as of the end of March, the bank said. Because an unrealized loss of $149 million was included in reported capital as of March 31, the exit at a slightly lower loss is modestly accretive to book value and capital ratios, according to Zions.

Zions struggled to pass recent Federal Reserve stress tests, which the central bank administers to measure whether institutions can weather another financial crisis. Zions failed a key portion of the test in 2014 and barely squeaked through this year, hurt at least in part by having a large portfolio of CDOs—bundles of mortgages or other debt that are sold to investors and which featured prominently in the 2008 financial crisis.

In the months leading up to this year's stress tests, Zions divested 69% of its CDO holdings and had said it could further shrink the portfolio. As of March, CDOs represented about 1.3% of Zion's total assets.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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