Stamps.com provides internet-based mailing and shipping solutions, primarily focusing on services authorized by the U.S. Postal Service.

It enables users to print official USPS stamps and shipping labels for a monthly fee. Its services cater to small offices, home offices, larger enterprises, e-commerce merchants, and high-volume shippers, including warehouses, fulfillment houses, and omnichannel retailers. The company was acquired by Thoma Bravo in 2021 and is now under the corporate name Auctane.

Key subsidiaries include Endicia, ShipStation, ShipWorks, ShipEngine, and ShippingEasy. Headquarters are in El Segundo, California, USA. Controversies include a $2.5 million consumer protection lawsuit settlement in 2015 over misleading free trials and a $100 million settlement in a 2019 class-action lawsuit alleging misleading investors about its USPS relationship. stamps.com is tagged under postage.

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