NPO · CIK 1164863
What Enpro Inc. told the SEC could break it.
Enpro's sharpest exposure is concentration in the semiconductor equipment market through its Advanced Surface Technologies segment: a single customer was about 24% of 2025 consolidated net sales (roughly $271 million) and semiconductors were 32.1% of total sales, so losing that customer or a downturn in semicap demand would materially hurt results. Pulling the other way are legacy environmental liabilities, where it is a potentially responsible party under CERCLA for the Lower Passaic River cleanup (EPA remedies estimated at $1.38 billion and $441 million, of which it bears an allocated share) and for eight former Arizona uranium mines on the Navajo Nation. Its supply chain adds a third risk — it has limited sources for certain key raw materials, so losing a supplier or a material could disrupt production.
3 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
- Single customer 24% of sales; semiconductor end-market 32%high
Enpro's Advanced Surface Technologies segment depends on a concentrated set of semiconductor-equipment customers — one customer alone was ~24% of 2025 consolidated net sales (~$271M) and semiconductors were 32.1% of total sales — so losing that customer or a downturn in semicap demand would materially hurt results.
“the segment is dependent on certain key relationships with customers in that industry, including a customer that accounted for approximately 24% of our 2025 consolidated net sales. These sales were made by our Advanced Surface Technologies segment and the loss of the segment's relationship with that customer or other key customers or other adverse changes in the segment's relationships with those customers cou”
SEC filing →As of 2026
Litigation
- CERCLA environmental liabilities (Lower Passaic River, Arizona uranium mines)medium
Enpro carries legacy CERCLA environmental liabilities as a potentially responsible party: the Lower Passaic River cleanup (EPA RODs of $1.38B for OU2 and $441M for OU4, of which Enpro bears an allocated share) and eight former Arizona uranium mines on the Navajo Nation requiring remediation.
“The EPA issued a Record of Decision (“ROD”) for OU2 in March 2016, selecting a remedy involving construction of an engineered cap over the riverbed at an estimated cost of $ 1.38 billion. In September 2021, the EPA issued a ROD for OU4, selecting an interim remedy consisting of targeted dredging and capping for the portion of OU4 not including OU2, followed by a monitoring period to assess the river system's response, at an estimated cost of $ 441 million.”
SEC filing →As of 2026
Supplier concentration
- Limited-source key raw materials & suppliersmedium
Enpro has limited sources for certain key raw materials and other supplies, so loss of a key supplier, unavailability of a key raw material, or other supply-chain disruption could adversely affect its production and results.
“The loss of a key supplier, the unavailability of a key raw material, or other disruptions of our supply chain could adversely affect our business, financial condition, results of operations and cash flows. In addition, we have limited sources for certain key raw materials and other supplies.”
SEC filing →As of 2026
The hidden graph
Who it depends on, and who depends on it.
Relationships surfaced from filings, including ones disclosed by the other side, which is how the non-obvious ones come to light.
Its customers
“Representative customers include leading global manufacturers of semiconductor manufacturing equipment, such as Applied Materials and ASML, as well as manufacturers of equipment used in the life sciences and industrial technology industries and government defense c”
Cited →“Representative customers include leading global manufacturers of semiconductor manufacturing equipment, such as Applied Materials and ASML, as well as manufacturers of equipment used in the life sciences and industrial technology industries and government defense c”
Cited →
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