United Parcel Service Inc (UPS.US) shares dropped more than 8% on Monday, closing at $98.38. The decline followed an announcement from Amazon.com regarding the launch of Amazon Supply Chain services. The new offering will open Amazon's entire logistics network—including freight, distribution, fulfillment, and parcel delivery—to businesses across all industries and sizes. This move heightens competition in the logistics sector and poses a direct threat to United Parcel Service's core operations.