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There’s something akin to a bank run happening at some bond ETFs. Despite the easily traded nature of ETFs, when the underlying assets they represent aren’t very liquid, redeeming shares can be a real problem. Bloomberg’s Rachel Evans and Emily Barrett report:

A couple of prominent investment funds are currently living through a portfolio manager’s worst nightmare: So many customers are demanding their money back that withdrawals need to be frozen.

Amit Deshpande, a former longtime risk manager, sees it as a wake-up call. In particular, he’s watching the growing ranks of asset managers who rely on ETFs to act as cash equivalents. He wonders whether the funds can be sold off to pay fleeing clients in times of stress as seamlessly as the stewards of the $4 trillion market would like.

In other words, are exchange-traded funds the ATMs many managers believe them to be? Or will they fail to sell quickly enough and at sufficient prices during a crunch to fulfill customer demands?

“We’ve taken a bunch of semi-liquid securities, put that into an equity wrapper, said now you’re an equity and now you’re liquid,’’ said Deshpande, currently head of fixed income quantitative investments and research at T. Rowe Price Group Inc. “It doesn’t always work that way.’’

Read more here.