CHICAGO — Rating pressures on five Wisconsin school districts involved in a now-worthless $200 million investment product eased on Monday when Moody’s Investors Service labeled as a credit positive their partial settlement of a lawsuit against the firms that advised and arranged the deal.

The districts settled their lawsuit last week against Stifel Financial Corp. They alleged the firm misled them on a risky investment in synthetic collateralized debt obligations to help fund their retiree health care benefits. The districts and Stifel also announced they were joining forces to take aim at the product’s arranger, RBC Capital Markets LLC.

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