Shares of Saia (SAIA) plunged on Friday after reporting first quarter earnings that missed on both the top and bottom lines. The less-than-truckload services company's CEO Fritz Holzgrefe said in the release, "March trends improved a bit from February, but we did not experience the expected seasonal step-up."

Yahoo Finance's Julie Hyman and Jared Blikre explain why the stock is selling off so sharply.

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This post was written by Stephanie Mikulich.