Walmart’s shareholders may have anticipated today’s selloff — if they’d been watching its bonds

Shareholders of Walmart Inc. may have had an inkling of today’s stock selloff if they had been watching the performance of its bonds over the last two weeks.

The bonds have seen net selling even as spreads have tightened, according to data solutions company BondCliQ Media Services.

The same is true for Costco Wholesale Corp. COST, as the company’s…