TSI

TSI is an inbound logistics term used within Amazon’s supply chain to describe any stock that arrives at a facility after being moved from another location, not directly from a vendor or seller.
This can include goods transferred between:

• Amazon fulfilment centres
• Cross dock facilities (IXD)
• Regional consolidation hubs
• Transshipment points used for load balancing

Key scenarios where TSI occurs:

• Inter FC transfers: When Amazon redistributes inventory to balance stock across regions
• Cross dock routing: Products arrive at a regional inbound cross dock and are forwarded to a new FC
• Carrier consolidation: Freight is combined or rerouted through logistics partners
• Network optimisation: Amazon shifts inventory to meet regional demand faster

TSI helps Amazon keep products closer to customers and maintain high Buy Box availability.

Why Amazon uses TSI:

• To reduce out of stock risk in specific regions
• To improve same day and next day delivery speeds
• To optimize fulfilment centre inventory levels
• To reduce transportation cost by consolidating loads
• To match supply with shifting demand patterns

Benefits for Amazon:

• Smoother network operations
• Better demand coverage
• More efficient use of FC capacity
• Reduced shipping times

Benefits for vendors and sellers:

• Faster customer delivery
• Higher in stock rates and stronger sales velocity
• Improved Buy Box stability
• Lower risk of regional inventory imbalance

Example:
A shipment of electronics is delivered to an Amazon IXD in Chicago.
Amazon then forwards part of that inventory to a fulfilment centre in Dallas to meet higher demand there.
The Dallas FC records this inbound as TSI (Trans Shipment In).

Why It Matters:
TSI ensures Amazon can move inventory strategically throughout its network, maintaining delivery promises and preventing regional OOS issues.
For sellers and vendors, it translates into higher availability and better customer experience.

In short:
TSI (Trans Shipment In) refers to inventory transferred into an Amazon facility from another location within the supply chain, helping Amazon balance stock and improve delivery performance.