FBA Stockout
React fast when FBA goes empty with Sherlock flags for products that lost the Buy Box and saw revenue collapse.
FBA Stockout is one of Sherlock's investigation cases. It catches products that ran out of inventory on FBA long enough to lose the Buy Box and bleed revenue: the situations where every extra day out costs the most. Use this page to spot the worst stockouts fast and prioritize replenishment by recoverable revenue.
What's on the page
At the top:
- The rule: "Products where FBA went out of stock this week (≥2 days), buy box dropped ≥10pp, and revenue fell ≥10%."
- Total opportunity: The combined revenue at stake.
- Refresh: Re-run the check with the latest data.
Below, the table:
| Column | What it means |
|---|---|
| Product | Image, title, marketplace flag, ASIN (with copy icon), and brand |
| Revenue drop | Week-over-week revenue change |
| Buy box drop | Change in Buy Box percentage, in percentage points (pp). The detail in parentheses shows prev% → now% |
| FBA OOS days | Number of days out of stock this week. "(was 2d)" notes mean the count went up vs the previous week |
| Opportunity | Estimated revenue you could recover by replenishing |
The list is sorted by Opportunity, biggest first.
How to read a row
Revenue drop: –99.2% · Buy box drop: –66.7pp (100.0% → 33.3%) · FBA OOS days: 7d · Opportunity: $1,954
It tells you:
- The product was out on FBA every day this week (7d).
- Buy Box collapsed from 100% to 33%.
- Revenue is effectively zero this week (–99%).
- Replenishing should recover ~$2k in the coming weeks.
Was 2d means OOS days got worse week over week. 7d (was 2d) signals the stockout is deepening, not recovering.
Open the product investigation
Click any row to open the same investigation view used by Signals (Overview, Timeline, Metrics).
For FBA stockouts, the most useful places to look:
- The Overview: It usually identifies the date the stockout started.
- The Metrics heatmap → Is Out Of Stock row, Buy Box Percentage, and Avg FBA on hand.
- The Timeline tab: Any inbound shipments or transfers should appear here.
What to do about it
- Replenish FBA fast. Send a same-day shipment if you can, or create an FBM backup listing to bridge the gap.
- Audit forecasting. If this product stocks out repeatedly, the safety stock is too low.
- Pause ads. Don't pay for traffic to an OOS listing. It burns cash and hurts CVR.
- Watch the recovery. Re-check the next 2 weeks. Rank usually takes a hit and needs paid pushes to recover.
Tips
- Stockouts compound: every day out of stock also hurts organic rank, so the loss outlives the stockout itself.
- Cross-check with Buy Box Loss: If the Buy Box loss is from a stockout and a price hike, both need fixing.