# Who does Martin Marietta Materials, Inc. pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/martin-marietta-materials · Facet: suppliers · Updated: 2026-09-23T07:31:38.954831+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Martin Marietta Materials, Inc.'s confirmed suppliers/cost counterparties include Union Pacific Corporation, Caterpillar, Komatsu. Per the valuechain.wiki graph: 3 cost edges, backed by 4 dated sources, 1 of them primary filings (as of 2026-09-23).

### 유니언 퍼시픽 (high)  → /union-pacific.md
- note: Union Pacific is a core rail carrier moving Texas quarry output to distribution yards in South Texas and Houston. The 10-K says rail operations and negotiated shipping contracts directly affect costs and operations.
- [confirms] SEC EDGAR (EN, filing, published 2026-02-19) https://www.sec.gov/Archives/edgar/data/916076/000119312526059193/mlm-20251231.htm: "rail shipments result in continued reliance on railroad operations"
- [confirms] Union Pacific (EN, news, published 2016-09-16) https://www.up.com/aboutup/community/inside_track/martin-marietta-9-16-2016.htm: "Martin Marietta is one of Union Pacific's largest volume customers."

### Premier Magnesia (high)
- note: Martin Marietta acquired Premier Magnesia in July 2025, adding U.S. natural magnesite and magnesium sulfate production capacity. The purchase price was not disclosed.
- [confirms] SEC EDGAR (EN, filing, published 2026-02-19) https://www.sec.gov/Archives/edgar/data/916076/000119312526059193/mlm-20251231.htm: "acquired Premier Magnesia, LLC"
- [confirms] Martin Marietta Materials (EN, ir, published 2025-08-04) https://ir.martinmarietta.com/news-releases/news-release-details/martin-marietta-and-quikrete-exchange-certain-cement-and: "completed the acquisition of Premier Magnesia, LLC"

### Caterpillar (mid)  → /caterpillar.md
- note: Caterpillar is an aggregates-business partner providing mobile quarry equipment and related services. Martin Marietta's report and a Caterpillar customer story confirm the equipment relationship, but spending is undisclosed.
- [confirms] Martin Marietta Materials (EN, ir, published 2026-05-16) https://mcdn.martinmarietta.com/assets/sustainability/2025sustainabilityreport.pdf: "work with Caterpillar, Komatsu, John Deere and other partners"
- [confirms] Caterpillar (EN, ir, published 2024-11-01) https://www.cat.com/en_US/by-industry/construction-industry-resources/compact-and-small-wheel-loaders.html: "Cat 938M Aggregate Handler Customer Story: Martin Marietta"

### 고마쓰 (mid)  → /komatsu.md
- note: Komatsu is an aggregates-business partner for mobile quarry equipment and lower-carbon technology. Martin Marietta directly confirms the partnership but does not disclose spending.
- [confirms] Martin Marietta Materials (EN, ir, published 2026-05-16) https://mcdn.martinmarietta.com/assets/sustainability/2025sustainabilityreport.pdf: "work with Caterpillar, Komatsu, John Deere and other partners"

Reverse side: https://valuechain.wiki/martin-marietta-materials/customers.md · Ripple: https://valuechain.wiki/martin-marietta-materials/ripple.md

---
Full node: https://valuechain.wiki/martin-marietta-materials.md · JSON: https://valuechain.wiki/martin-marietta-materials.json