UPS shares tank 17% after weak guidance, plan to slash Amazon deliveries by more than half

Core Viewpoint - United Parcel Service (UPS) shares dropped over 17% following weak revenue guidance and plans to significantly reduce deliveries for Amazon, its largest customer, by more than 50% by the second half of 2026 [1][2] Group 1: Financial Performance - UPS reported a weak revenue outlook for the year, prompting a significant decline in its stock price [1] - The company anticipates savings of approximately $1 billion through the reconfiguration of its U.S. network and multi-year efficiency initiatives [1] Group 2: Customer Relationship - Amazon is identified as UPS' largest customer, but it is not the most profitable one, as its margin negatively impacts UPS' U.S. domestic business [2] - UPS is implementing operational changes to enhance profitability and agility, aiming to focus on more lucrative market segments [2]