The proposed class action filed in Newark, New Jersey, federal court arose from Bed Bath & Beyond's termination of the 401(k) plan on Aug. 1, a little over three months after the company sought Chapter 11 protection.

Former employees said they lost more than $5 million when their MassMutual "guaranteed investment account," which they thought had little risk, suffered a 10% loss because rising interest rates hurt the value of its underlying investments.

They said the 401(k) committee breached its fiduciary duties by failing to replace the account with similar investment options, such as money market funds and stable value funds, that carried less principal risk if the company went bankrupt.

Overstock.com bought and now operates its website under the Bed Bath & Beyond name. Neither the company nor a spokesman for a firm overseeing the plan's termination immediately responded to requests for comment.

In guaranteed investment accounts, an insurer typically invests in stocks and bonds, and pays investors a fixed return.

The former employees said the MassMutual account was invested mainly in long-term bonds that could lose value if interest rates rose. They also said MassMutual had the right to make up losses if its contract were terminated.

According to the complaint, Bed Bath & Beyond knew as early as 2019 that its business model was not viable, and had "ample opportunity" in 2020 and 2021 to replace the account before rates began rising.

Had it done so, "it would have terminated the MassMutual Contract by notice and avoided the risk of Plan losses that could result from BBB's bankruptcy and a decrease in value of the GIA's underlying portfolio," the complaint said.

The lawsuit seeks to recoup all losses resulting from violations of the federal Employee Retirement Income Security Act, which generally protects 401(k) investors.

The case is Harvey et al v Bed Bath & Beyond Inc 401(k) Savings Plan Committee et al, U.S. District Court, District of New Jersey, No. 23-20376.

(Reporting by Jonathan Stempel in New York; editing by Diane Craft)

By Jonathan Stempel