What Cabot Corp. told the SEC could break it.

Cabot's core reinforcing-carbons (carbon black) business is feedstock-intensive: it consumes petroleum-based feedstock (fuel/decant oil) and natural gas, plus water and electricity, in manufacturing. Its raw-material costs are driven by the availability, supply/demand and transportation costs of these feedstocks, so swings in oil and natural-gas prices flow directly into Cabot's cost of goods to the extent it cannot pass them through via contract price mechanisms.

“Natural gas is also used as a feedstock in the production of our reinforcing carbons. Our manufacturing process also requires water and electricity. Raw material costs generally are influenced by the availability of various types of our feedstocks, supply and demand of such raw materials and related transportation costs.”

Two of Cabot's specialty product lines carry meaningful customer concentration: in battery materials, four customers account for roughly 50% of that line's revenue, and in fumed metal oxides, contracts with six customers account for about one-third of revenue. Loss or reduced purchasing by any of these large customers — particularly in the strategic, fast-growing battery materials line — would materially affect those segments' results.

“In our fumed metal oxides product line, sales under contracts with six customers account for approximately one-third of the revenue. In our battery materials product line, sales to four customers account for approximately 50% of revenue.”

Cabot has substantial China exposure on both the demand and asset side: in fiscal 2025 sales in China were ~25% of revenues and China-located property, plant and equipment was ~21% of total PP&E (including majority-owned plants in Tianjin, Jiangxi and Wuhai). This concentration is amplified by US-China trade tensions, which the company says have increased the risk of sanctions against its Chinese suppliers and customers that, if imposed, could restrict its ability to do business with them — a meaningful geopolitical/supply-chain exposure.

“In fiscal 2025, sales in China across our segments constituted approximately 25% of our revenues, and our property, plant, and equipment located in China constituted approximately 21% of our total property, plant and equipment as of September 30, 2025, as disclosed in Note U to our Consolidated Financial Statements.”

Under an EPA settlement, Cabot must install SO2/NOx emission-control technology at its U.S. carbon-black plants (Pampa TX, Franklin LA, Ville Platte LA), with total capital cost of approximately $270 million (~$241 million incurred through September 30, 2025) plus higher ongoing operating costs. It also faces EU ETS, a Netherlands CO2 top-up tax on its Dutch carbon-black plant, and a China emissions-trading program expected to expand to the carbon-black sector — a broad, quantified environmental-regulatory cost burden across its global footprint.

“We expect that the total capital costs to install these technology controls will be approximately $270 million and will be incurred through early 2026. As of September 30, 2025, we have incurred $241 million to install these controls in the U.S.”

Some of Cabot's products are made at a single facility that is the sole source for that product, so a material operating problem (leak, fire, explosion, toxic release, severe weather, mechanical failure or unscheduled downtime) at such a plant — or a supply-chain/distribution disruption — could cause loss of production and make it hard to meet customer needs. The risk is not hypothetical: Cabot has experienced unplanned plant outages in recent years.

“In addition, the occurrence of material operating problems at our facilities, particularly at a facility that is the sole source of a particular product we manufacture, or a disruption in our supply chain or distribution operations may result in loss of production, which, in turn, may make it difficult for us to meet customer needs.”