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Gap Inc.

Gap's shares plummet after sales continue to slide

Gap Inc. just can't seem to shake off the blues.

The company's shares fell nearly 9 percent in after-hours trading Thursday, after the clothing retailer announced March results that show its continued sales funk. It marked its 12th consecutive monthly decline for the key revenue measure.

It also warned that it was entering April with higher levels of inventory, which it said could hurt profit margins.

The ailing retailer, based in San Francisco, California, said late Thursday that its revenue at stores open at least a year fell 6 percent as all three key brands— Banana Republic, Old Navy and its namesake label — suffered sales drops. Analysts were...