Wholesale distributors occupy the middle layer between manufacturers and contractors. Their business model is the spread between what they pay and what they charge. Ferguson Enterprises reported a 30.7% gross margin on $30.8 billion in sales in fiscal year 2025. SiteOne Landscape Supply reported 34.8% on $4.70 billion. These are audited figures from SEC filings. This page explains what they mean and how they connect to the price on your invoice.
A wholesale distributor occupies the middle position in a three-layer supply chain: the manufacturer produces the product, the distributor purchases it at a manufacturer price and resells it to contractors and end users at a higher price. The difference between what the distributor pays and what the distributor charges is their gross margin.
The U.S. Bureau of Economic Analysis defines wholesale trade output as margin-based — sales less cost of goods sold — rather than purely sales-based. The BEA's framing is explicit: the value of wholesale trade is the markup, not the volume. The distributor's business model is the spread between what they buy and what they sell. ↗ BEA.gov
Distributors set their own prices. Standard distribution contract language confirms that distributors have "sole, complete and absolute discretion to establish and maintain the prices at which they sell products to customers." The manufacturer's suggested price is advisory only. ↗ LawInsider
What a contractor pays for any given product is what the distributor decides to charge — adjusted by whatever account-level pricing, volume discounts, or spot pricing applies to that specific customer relationship on that specific day.
Ferguson and SiteOne are both publicly traded. Their gross margins — the percentage spread between what they pay manufacturers and what they invoice contractors — are disclosed in quarterly and annual reports filed with the SEC. These are not estimates. They are audited financial figures.
The connection between raw material markets and your invoice is direct but lagged. When copper prices rise, the manufacturer's cost of producing copper pipe rises. The manufacturer adjusts the price they charge the distributor. The distributor adjusts the price they charge contractors. That sequence typically plays out over days to weeks — not months.
SiteOne's own earnings call language confirms the mechanism explicitly. In their Q1 2024 earnings call, management discussed "double-digit deflation in products like fertilizer, seed and PVC pipe" compressing gross margins — meaning when commodity prices fell, distributor margins came under pressure, confirming that commodity costs and distributor prices are directly linked. ↗ SiteOne Q1 2024 Earnings Call
A July 2025 NBER working paper by economists at Harvard, UVA, and Esade — "Markups and Cost Pass-through Along the Supply Chain" — documents that manufacturer and retail markups are negatively correlated: when commodity costs rise rapidly, manufacturer margins compress while distributor margins may expand, and vice versa. The total markup across the chain remains stable. ↗ NBER WP 34110
The practical consequence: a commodity price move gives distributors factual justification to reprice. Whether the reprice is proportional to the actual cost change — or whether it exceeds the cost change — is not visible from the invoice alone. It requires comparison against the commodity index for that material at the time of the order.
Copper COMEX price increases. Wire rod and copper tube manufacturer costs rise. Ferguson reprices copper pipe and fittings at the branch level. The contractor's job account reflects the new price on the next order — whether or not a formal price change notification was issued and whether or not the contractor's original quote has been updated.
The SiteOne Q1 2024 earnings call documented margin compression during commodity deflation — meaning when commodity prices fall, distributor pricing does not always fall at the same rate. The NBER research confirms that total supply chain markups are stable across commodity cycles. A commodity price decrease does not automatically produce a proportional invoice price decrease.
A contractor quotes a job using current distributor pricing. The job is awarded. Between award and material delivery, the commodity underlying the material moves. The distributor reprices. The invoice reflects the new price. The contractor's bid does not. The margin absorbs the difference.
The Bureau of Labor Statistics Producer Price Index tracks commodity prices at the manufacturer level — what manufacturers charge distributors, not what distributors charge contractors. The PPI series for specific materials (copper wire, steel pipe, PVC, fertilizer, asphalt) are publicly available via FRED and updated monthly. They are the closest public benchmark to the actual commodity cost flowing into your invoice.
Standard distribution contracts confirm that distributors set prices independently per customer. Volume, relationship tenure, payment terms, and account size all factor into what a specific contractor pays for the same product on the same day from the same branch. Two contractors buying identical products from the same Ferguson branch on the same day may pay different prices. ↗ LawInsider distribution contract clauses
Manufacturers offer distributors volume rebates — retrospective discounts tied to total purchase volume over a period. These rebates improve the distributor's effective cost of goods and can improve their margin without any change in the price they charge contractors. The rebate is a tool for the distributor's profitability, not automatically a mechanism that lowers contractor invoices. ↗ Rebate program mechanics
Items not on a formal quote or contract are priced at the distributor's discretion at the time of order — counter price, system price, or whatever the branch applies to your account that day. Ferguson's own pricing system assigns account-level price tiers. A contractor without a formal contract on a specific SKU is paying whatever the system applies. That number is not fixed until the invoice is issued.
Ferguson's pricing operation manages approximately 180,000 SKUs across 1,700+ branches and over 1 million customer accounts. SiteOne's fiscal 2025 10-K lists an Executive Vice President of Marketing, Category Management and Pricing as a named officer — a dedicated senior executive whose function is pricing strategy across their product catalog. Pricing at this scale is a systematic operation, not a passive activity.
A 2007 patent for a wholesale distributor pricing system describes the operational reality: a pricing manager has responsibility for pricing decisions across potentially tens of thousands of unique customer-item combinations. The system evaluates sales volume, purchase frequency, and gross profit percentage to optimize pricing decisions across the portfolio. ↗ USPTO Patent 7379922
The contractor on the other side of that system is reviewing invoices one at a time, if at all. The information asymmetry is structural. The distributor has real-time visibility into commodity costs, account-level margin, and competitor pricing. The contractor has the invoice and whatever quote was on file when the job started.
Ferguson's Q4 FY2025 earnings attributed gross margin improvement to "associates' disciplined execution" and "diligent management of the cost base." ↗ Benzinga / Ferguson earnings In distributor financial reporting, disciplined execution on gross margin means managing the spread between what they pay and what they charge — actively, not passively. It is the distributor's primary financial performance metric.
Nothing in the distributor business model requires the price on your invoice to match the price on your quote. The distributor has the right to set their own prices. The commodity market moves. The distributor reprices. Your invoice reflects the new price. Your quote does not automatically update. The gap between them is not flagged by the distributor. It is absorbed by whoever is not checking.
When a commodity price increases and the distributor raises their invoice price proportionally, that is a legitimate cost pass-through. The manufacturer's cost increased. The distributor passed it through. The contractor's bid did not account for it, but the underlying cost increase is real. BLS PPI data documents what the cost actually moved — that is the benchmark for whether a pass-through is proportional.
When a distributor raises invoice prices by more than the underlying commodity moved, the excess is margin expansion — additional gross profit captured above the cost increase justification. This is legal and is the distributor's prerogative. It is also invisible without comparing the invoice price to both the quoted price and the relevant commodity index at the time of the order.
An overcharge, in the context of the Ledger, is any invoiced price that exceeds the agreed quoted price for the same product — regardless of what the commodity market did. The quote is the agreement. The invoice is the charge. If the invoice exceeds the quote without a formal change order or price adjustment notice, the difference is an overcharge. The commodity market explains why the distributor may have wanted to reprice. It does not authorize them to do so without your agreement.
The Overcharge Ledger compares what you were quoted against what you were invoiced — every line item, every supplier, every month. It also maps your invoice prices against the relevant BLS PPI series for your primary materials, so you can see where distributor price increases track the commodity market and where they exceed it. Both pieces of information belong to you. The Ledger produces them.
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