What Core Natural Resources, Inc. told the SEC could break it.

Customer concentration is meaningful: in 2024 two customers each comprised over 10% of total sales, aggregating about 22%; with sales to power generators, steel producers and industrial users (and ~28% exported), loss of a major customer would materially affect results.

“For the year ended December 31, 2024, two customers each comprised over 10% of our total sales, aggregating approximately 22% of our total sales.”

EPA's 'Clean Power Plan 2.0' greenhouse-gas rules would require coal-fired power plants — CNR's largest customer base — to install carbon capture (90% by 2032), co-fire natural gas, or close, pressuring thermal-coal demand; the rules are under litigation but threaten the bulk of CNR's volumes.

“For existing coal-fired EGUs in operation on or after January 1, 2039, the rule requires EGUs to be equipped with Carbon Capture and Storage (“CCS”) with 90% capture on or before January 1, 2032.”

A pure-play coal producer (post-merger: 73% power generation, 16% industrial, 11% metallurgical of 2025 sales tons), CNR's results turn on thermal and met-coal prices, which depend on supply/demand, competing natural gas prices for power generation, and global steel demand.

“The prices we are able to achieve in the domestic thermal market depend on a number of factors, including (i) the supply-demand balance for our products, (ii) prices for other competing sources of energy used for electric power generation, such as natural gas”