GSM · CIK 0001639877
What Ferroglobe PLC told the SEC could break it.
Ferroglobe's disclosures cluster on the concentrated sourcing of the raw materials behind its metals and alloys. Its most acute input dependency is metallurgical coal: it buys about 57% from third parties, and 86% of those 2025 purchases came from a single country, Colombia — concentration it is actively trying to ease by adding Australian material amid worries about Colombian availability. Its manganese ore comes mainly from South Africa and Gabon (where it already hit severe shipment delays in 2025). The other end is concentrated too — its ten largest customers were 44.9% of 2025 sales, led by Dow Silicones at 12.3% — and as a transatlantic metals producer it faces two-sided tariff exposure, including a new 10% Section 122 global tariff (signaled to rise to 15%) plus steel and aluminum quotas on products it both makes and uses.
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.
Commodity & input dependence
- metallurgical coal — 86% of third-party purchases from Colombiahigh
~57% of coal is bought from third parties, and 86% of those purchases came from Colombia in 2025 — a single-country input concentration the company itself flags by diversifying to Australian material over Colombian availability concerns.
“Although we have begun to source Australian material in an effort to diversify from Colombia given concerns regarding the future availability of their coal, in 2025, approximately 86% of our third party purchase came from Colombia.”
- manganese ore — sourced mainly from South Africa & Gabon; Gabon delays realizedmedium
Manganese ore for the alloys business comes mostly from South Africa and Gabon (high-grade ore is globally concentrated in Australia, Gabon, South Africa, Brazil); the filing notes severe shipment delays from Gabon in 2025 — a realized logistics disruption.
“The majority of the manganese ore Ferroglobe purchased in 2025 came from suppliers located in South Africa and Gabon with additional procurement from Ghana and Mexico.”
Customer concentration
- top 10 customers — 44.9% of sales; Dow Silicones largest at 12.3%medium
Sales are concentrated in a small set of industrial buyers: the 10 largest customers were 44.9% of FY2025 consolidated sales (56.0% in 2024), led by Dow Silicones Corporation at 12.3%.
“For the year ended December 31, 2025, our 10 largest customers accounted for 44.9% of the Company's consolidated sales.”
SEC filing →As of 2026
Regulatory & policy
- Section 122 global tariff (10%→15%) + steel/aluminum tariff-rate quotasmedium
Post-SCOTUS, the administration imposed a 10% global tariff under Section 122 with intent to raise to 15%; layered on steel/aluminum tariff-rate quotas and China tariffs on products Ferroglobe both produces and consumes — a two-sided tariff exposure for a transatlantic metals producer.
“Following the Court's decision, the administration imposed a new global tariff of 10% under Section 122 of the Trade Act of 1974 and has signaled its intent to raise it to 15% and generally pursue alternative legal avenues to maintain its tariff strategy.”
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
Dow Silicones Corporation (Dow Inc. subsidiary)
“During 2025, 2024, and 2023, sales corresponding to its largest customer, Dow Silicones Corporation, represented 12.3 %, 16.8 % and 17.0 %, respectively of the Company's sales.”
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