EXP · CIK 918646
What Eagle Materials Inc. told the SEC could break it.
Eagle Materials' disclosures split along its two main product lines. Its gypsum wallboard business carries real customer concentration — three customers together were about 64% of that segment's fiscal 2026 sales — while its cement operations face a regulatory overhang: the EPA's Good Neighbor plan sets ozone-season NOx limits on cement kilns beginning in 2026, hitting its Nevada, Oklahoma, and Texas plants with likely control-equipment spending (the rule is currently stayed pending reconsideration). On the input side, it relies on single suppliers for certain raw materials, including synthetic gypsum and slag granules that are by-products of other industrial processes, and natural gas was about 8% of fiscal 2026 production costs, leaving margins exposed to gas-price swings.
4 self-disclosed vulnerabilities, pulled from its own filings, each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Customer concentration
- Gypsum Wallboard segment — three customers = ~64% of segment salesmedium
Eagle Materials' Gypsum Wallboard segment is concentrated, with three (unnamed) customers together accounting for roughly 64% of that segment's fiscal 2026 sales; no single customer exceeded 10% of Cement or aggregates revenue.
“Three customers collectively accounted for approximately 64% of our Gypsum Wallboard segment sales during fiscal 2026.”
SEC filing →As of 2026
Regulatory & policy
- EPA Good Neighbor FIP NOx limits on cement kilns (NV/OK/TX plants)medium
The EPA Good Neighbor Federal Implementation Plan sets ozone-season NOx emissions limits on cement kilns beginning 2026 in 20 states; Eagle's cement plants in Nevada, Oklahoma, and Texas are most directly affected, with required NOx-control capital expenditures (the FIP is currently under a nationwide stay pending reconsideration).
“The FIP establishes ozone season nitrogen oxide (NOx) emissions limitations 12 beginning in 2026 for kilns used in cement and cement product manufacturing in 20 states, including all the above-listed states relevant to our cement operations.”
SEC filing →As of 2026
Sole-source dependency
- single-supplier raw materials — synthetic gypsum and slag granules (industrial by-products)medium
Eagle obtains certain manufacturing raw materials from a single supplier, including synthetic gypsum and slag granules that are by-products of other industrial processes; long-term contracts may be insufficient or unrenewable, creating sole-source supply risk.
“In certain circumstances we also obtain certain raw materials used to manufacture our products from a single supplier and some of those materials, such as synthetic gypsum and slag granules, are produced as by-products of industrial processes.”
SEC filing →As of 2026
Commodity & input dependence
- natural gas — ~8% of fiscal 2026 production costslow
Natural gas is a meaningful energy input for Eagle's manufacturing, representing approximately 8% of production costs in fiscal 2026, exposing margins to gas price volatility.
“Natural gas costs represented approximately 8% of our production costs in fiscal 2026.”
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