SIOP, Inventory & Working Capital | Valverus
Last updated: September 2, 2026
SIOP / Inventory / Working Capital

Your cash is sitting on a shelf.

Quick answer Inventory and working capital get out of control when planning parameters, forecast accuracy, SIOP alignment, and supply-demand visibility are weak or volatile. The fix isn’t more inventory. It’s disciplined SIOP maturity, inventory segmentation, and planning parameter review, applied across the end-to-end supply chain.
Working capital tied up, by SIOP maturity level
LEVEL 1 LEVEL 2 LEVEL 3 LEVEL 4
Large industrial warehouse with tall storage racking

The challenge

Cash tied up in obsolete stock. Shortages that force firefighting. Forecasts nobody trusts. These aren’t separate problems. They’re symptoms of one thing: a SIOP process that isn’t mature enough to keep planning, purchasing, and demand in sync.

How this affects your team

PersonaPain pointValverus capability fit
CFOCash tied up in inventory, poor working capital turns, obsolete stockWorking capital diagnostics, inventory segmentation
COOShortages, firefighting, poor supply-demand alignmentForecast and supply alignment, SIOP maturity review
Supply Chain LeaderWeak forecast accuracy, bad planning parameters, low inventory accuracyPlanning parameter review, inventory accuracy improvement
PE Managing PartnerSlower cash release, muted EBITDA impact, missed value-creation windowsSIOP maturity review, working capital diagnostics

Root causes

Miscalculated planning parameters. Disjointed SIOP alignment across functions. Forecasts built on instinct instead of data. Inventory policies that haven’t been segmented by what actually matters: cost, velocity, criticality.

Our approach

Valverus helps leadership teams release cash from inventory, improve working capital, and increase cash flow, while simultaneously protecting service levels, by improving, automating, and optimizing lifecycle management, planning discipline, purchasing behavior, inventory policies, and supply-demand alignment across the end-to-end supply chain.

SIOP maturity review Inventory segmentation Working capital diagnostics Planning parameter review Forecast and supply alignment Inventory accuracy improvement Automated lifecycle management optimization
Two people reviewing inventory together in a warehouse
40%
In a documented case published by APICS (now ASCM), a manufacturer with more than 40 production facilities decreased working capital by 40% after maturing its S&OP process, alongside a 10-point increase in customer service and forecast visibility extended to 18 months. Source: APICS (ASCM), “APICS S&OP Performance: Advancing Sales and Operations Planning.”

Success case

Large warehouse distribution facility filled with storage shelving
Case study · Rail Parts Services

Cutting Air Freight 30% and Saving $800K Through Inventory Optimization Across a Regional Distribution Network

30%Reduction in air freight shipments
$800K+Generated in savings
Improved availability, lower logistics cost
100% BEFORE -30% AFTER

Inventory structures across multiple regional and centralized warehouses were inefficiently organized. High and misaligned inventory levels at the wrong locations led to recurring air freight shipments, long lead times, and increased logistics costs. These are the same planning-parameter and segmentation gaps described above.

Valverus analyzed material movement and replenishment flows across all warehouse levels, applied ABC-XYZ inventory segmentation to identify redundancies and imbalances, rebuilt minimum and target stock levels by location, and aligned replenishment strategy between central and regional warehouses using push/pull logic, with KPI monitoring put in place for early intervention going forward.

How this connects to cash: this engagement was scoped and reported as freight and logistics savings rather than a working-capital release, so the $800K+ figure reflects P&L savings, not a balance-sheet cash number. The same segmentation and planning-parameter mechanism is what CFOs and PE Managing Partners use to release cash from inventory on engagements scoped that way. The lever is identical, only the reporting frame differs.
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Frequently asked questions

CFOHow much working capital is typically trapped in excess inventory, and how fast can it be released? +

Most manufacturers with immature SIOP processes have 15–25% more inventory than necessary. Release timelines depend on inventory segmentation and lead times, but early cash release from obsolete and slow-moving stock often begins within the first 60–90 days of a working capital diagnostic.

COOWhy do shortages and firefighting keep happening even with good demand? +

Shortages usually trace back to disjointed SIOP alignment. Planning, purchasing, and supply are optimizing separately instead of against one shared forecast and set of planning parameters.

Supply Chain LeaderWhat causes low inventory accuracy and bad planning parameters? +

Planning parameters that were set once and never revisited, combined with forecast accuracy that isn’t measured or fed back into the planning process, are the most common causes.

PE Managing PartnerHow does SIOP maturity connect to fast, low-risk value creation? +

SIOP maturity is one of the fastest, lowest-risk levers available in a hold period. Cash released from inventory shows up on the balance sheet directly, independent of any margin or growth initiative.

What causes inventory obsolescence in manufacturing? +

Obsolescence typically stems from weak forecast accuracy, infrequent inventory policy review, and a lack of segmentation. Slow-moving and fast-moving items get managed with the same rules.

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