Stamps.com (STMP - Get Report) shares jumped in after-hours trading after the company announced a collaboration with UPS (UPS - Get Report) which will give its customers access to discounted shipping rates.
Shares rose $15.47, or 20%, to $91.60 in after-hours trading.
Under the agreement, Stamps.com customers will gain access to discounts of up to 55% off daily rates, the companies said in a statement.
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