In a perfect world, every store sends clean, real-time inventory data. In the real world, some locations can’t (or won’t) provide it, because of legacy systems, privacy policies, bandwidth or cost. Should those doors stay closed to data-driven replenishment? Not at all.
Shadow Stock bridges the gap. It lets brands replenish intelligently without an inventory feed, so you still get the right product, in the right sizes, to the right stores on time. Find out more about what Shadow Stock means, how it works and what our partner Petrol Industries thinks about the feature.
What is Shadow Stock?
Shadow Stock is a modeling approach inside the Chainbalance solution that reconstructs a store’s likely inventory position from data points you already have: orders and sales. Instead of relying on a physical stock count, the system builds a “shadow” of inventory for each location and keeps refining it as new events come in.
The result: stores that aren’t EDI-enabled (or are partially integrated) can still be included in automated, demand-driven Smart Replenishment, without extra IT work.
How does Shadow Stock work?
- Start assumption: If a store has no known stock events, we assume inventory is depleted.
- Rebuild from signals: Every sale and replenishment updates the shadow balance.
- Iterate & learn: Over time, the model becomes increasingly accurate, because the chain of events (sales, deliveries, returns) provides a reliable picture of what could be on hand.
- Act with guardrails: Replenishment proposals use this shadow balance plus your business rules (min/max, size curves, display minimums, lead times) to recommend the fewest, most effective shipments.
Why it matters?
Shadow Stock unlocks non-EDI stores and brings more of your network under smart control without waiting for every integration to be completed. It protects sales potential by proactively addressing size gaps and stockouts, even when stores don’t send stock files. Because Shadow Stock runs on data you already exchange, such as orders and sales, there is no heavy lift for IT and no need for new data pipelines. You gain transparency into performance and availability without requesting each store’s internal inventory exports. At the same time, you stay in control: you can download proposal lists, adjust quantities, upload them again and the system will recognise your changes and apply the logic consistently.
What are some typical use cases for the Shadow Stock?
Shadow Stock is particularly useful for franchise and wholesale networks with mixed data maturity, where some partners send EDI and others do not.
“We started using Shadow Stock in October ’25, because we wanted to start with Smart Replenishment but our customer could not share their INVRPT’s with us.”
It supports rapid rollouts when you cannot wait for every store to integrate before you start seeing impact. In privacy-sensitive markets, where partners are reluctant to share stock files but are willing to share sales and order confirmations, Shadow Stock offers a practical solution. It is also valuable during transition periods while POS or ERP systems are being migrated or master data is being cleaned, ensuring replenishment continues to run smoothly throughout the change.
What you can configure in the ‘Shadow Stock’ feature.
Within the Shadow Stock feature, you can define eligibility and rules by deciding which stores are included, which products or SKUs are in scope, and what minimum and maximum quantities per size, forward cover and display minimums should apply. You can configure timing parameters such as replenishment frequency, cut-off times, DC lead times and delivery calendars. Cost and capacity constraints, like package limitations, DC throughput, and carrier limits, can be set to keep proposals operationally feasible. In addition, you can tailor the assortment logic with localized size curves, colour priorities, seasonal flags and lifecycle status so the model reflects your commercial reality. With Shadow Stock, these features and options are not just appliable to stores with active inventory feed, but also enable the active Smart Replenishment of other stores.
Chainbalance Shadow Stock: Quality you can trust
Shadow stock balances become more accurate with every event processed, reaching a level that is quickly good enough for daily operations and continuing to tighten over time. Several safeguards ensure quality:
- anomaly checks react appropriately when sales spike without replenishment by increasing urgency rather than over-correcting
- lifecycle awareness keeps the model conservative in the early phase of a launch and more responsive as signal strength grows
- human oversight allows planners to review proposals, override edge cases, and feed back improvements so the system keeps learning
What Shadow Stock is (and isn’t)
Shadow Stock is a pragmatic, data-driven way to approximate inventory and run replenishment in locations where inventory feeds are missing. It is not meant to replace perpetual inventory systems or physical stock counts.
In Anouk’s opinion, there are limits to Shadow Stock as well. For example, she would prefer a full inventory feed, if stock is transferred from Store A to Store B, and the brand is not informed. It makes replenishment inaccurate, and the potential end stock can be too high. It was one of the challenges they faced in the trial. But:
“We would always prefer a full inventory feed of course, but shadow stock gave us the opportunity to replenish and increase business without it.”
What`s the takeaway here? If you can obtain high-quality stock feeds, you should absolutely do so. Shadow Stock serves as a bridge and a bridge function that enables Smart Replenishment today while full integration catches up.
Reporting & collaboration
Reporting provides store-level transparency, showing shadow availability, recent events, recommended orders and the effect on fill rates. At network level, you gain a clear overview of which stores benefit most from Shadow Stock, helping you prioritise where further integrations will deliver the highest ROI.
Operational exports allow you to download transfer and order files and feed them directly into your ERP and existing logistics processes, ensuring collaboration between teams and systems remains seamless.
What is the business impact?
In practice, users experience higher on-shelf availability in non-EDI locations, especially for fast movers and key sizes. There are fewer emergencies, such as last-minute shipments and manual firefighting and margins improve thanks to reduced lost sales and fewer markdowns.
“We were able to improve both on-shelf availaibility and sell-through. We also noticed some growth in turnover, thanks to Smart Replenishment which was not possible withouth ‘Shadow Stock’. This further improved the trust of our customer for future replenishment.”
Overall effort drops as teams spend less time on spreadsheets and more time on strategic work. Because you ship only what is needed, when it is needed, Shadow Stock also supports sustainability goals by cutting unnecessary transport and overstock.
Shadow Stock: No data needed? Shadow Stock does not replace EDI! It supplements your network so every store can be included while integrations are being modernised.
What data do you need? The only data you need are sales and replenishment confirmations or shipments, enough to reconstruct a reliable shadow balance.
How long does it take to implement? Rollout is typically fast, because the feature uses data flows you already have and is designed for low IT effort.
How does it learn? Can you adjust it? Planners can override proposals at any time by downloading them, editing quantities and re-uploading; the solution applies these adjustments and continues learning from them.
The bottom line: Extended power of Smart Replenishment
Shadow Stock extends the power of Smart Replenishment to locations where inventory data is incomplete, inconsistent, or unavailable, so your network can perform as one.
One last advice from Anouk, for those who are unsure about replenishing without inventory data and Shadow Sock instead:
“Just do it! And make sure you have frequent check-ins with your customer in the starting phase, then it’s as simple as with inventory data.”
Are you interested in using shadow stock to onboard additional? Are you ready to unlock all your hidden potential with bringing more stores under smart control without new integrations? Let’s talk!