Watch for Junk-Bond Air Pockets as Sprint Spirals Downward

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Sprint Corp. is a cautionary tale for investors who think they’re immune to carnage in the $1.3 trillion junk-bond market as long as they steer clear of energy debt.

Moody’s Investors Service on Tuesday downgraded the wireless company, which has more than $30 billion of debt outstanding, as it struggles to compete with better capitalized competitors such as AT&T Inc. and T-Mobile USA. Much of the company’s debt was downgraded several steps to Caa1, which is considered close to default.