Purchasing & suppliers
Vendor-Managed Inventory (VMI)
By the Supply Chain Manager team · Updated October 16, 2026
Vendor-managed inventory (VMI) is an arrangement where the supplier monitors the buyer's stock levels and decides when and how much to replenish.
The buyer shares stock and sales data, and agrees target minimum and maximum levels. The supplier raises the replenishment orders. Distributors can sit on either side: receiving VMI from a manufacturer, or running it for their own customers' storerooms.
The data feed is the foundation. VMI fails quickly if stock and usage figures arrive late or are inaccurate, because the vendor then replenishes against the wrong picture. Agreeing how often data is shared, who checks it and what happens when counts disagree avoids most of the disputes VMI programs run into.
VMI example
Illustrative: a distributor manages fastener bins at a manufacturer's plant, counting weekly and topping each bin to an agreed level. The customer never raises a PO for those items, and the distributor sees demand directly instead of guessing from erratic orders.
Why VMI matters for distributors
Run well, VMI cuts the bullwhip effect because the supplier sees real usage, and locks in the customer relationship. It does require trustworthy data and clear rules about who owns the stock and when.
Common VMI mistakes
- Starting VMI without agreed min/max levels and review dates.
- Unclear ownership of slow or obsolete stock that the vendor placed.
Examples on this page use made-up round numbers to show the calculation. They are not benchmarks or results from real businesses.