NEW YORK (TheStreet) — Stamps.com stock is plummeting Thursday after the postage retailer missed expectations for its first-quarter earnings and revenue. By late afternoon, shares had tumbled 16.4% to $29.01. Net income of 50 cents a share fell short of estimates by 4 cents, according to analysts surveyed by Thomson Reuters. Revenue of $33.3 million climbed 4% year over year, but missed …
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