EX-21.01

EXHIBIT 21.01

SUBSIDIARIES OF MARTIN MARIETTA MATERIALS, Inc.

AS OF DECEMBER 31, 2025


	Percent
Name of Subsidiary	Owned
1560947 B.C. LTD., a British Columbia, Canada corporation	100%1

2M Lands, LLC, a North Carolina limited liability company	100%2

Alamo Gulf Coast Railroad Company, a Texas corporation	99.5%3

Alamo North Texas Railroad Company, a Texas corporation	99.5%4

Albert Frei & Sons, Inc., a Colorado corporation	100%5

American Aggregates Corporation, a North Carolina corporation	100%

American Materials Technologies, LLC, a Tennessee limited liability company	100%6

American Stone Company, a North Carolina corporation	50%7

AR & MJ Frei Limited Partnership, a Colorado limited liability partnership	100%8

Bahama Aggregates Company, LLC, a Delaware limited liability company	100%

Bahama Cement Company, a Liberian nonresident domestic corporation	100%9

Bahama Rock Limited, a Bahamas corporation	100%

Bluegrass – Blue Mount, LLC, a North Carolina limited liability company	100%10

Bluegrass Materials Company, LLC, a North Carolina limited liability company	100%11

Bluegrass-St. Marys, LLC, a North Carolina limited liability company	100%12

Brookhollow Corporation, a Delaware corporation	100%13

Campbell’s C-Ment Contracting, Inc., a Colorado corporation	100%14

Carolina Quarries, Inc., a Delaware corporation	100%15

CIG MC LLC, a Colorado limited liability company	100%

Creole Corporation, a Delaware corporation	100%16

FRI Ready Mix of Tennessee, LLC, a Florida limited liability company	100%17

Front Range Aggregates LLC, a Delaware limited liability company	100%

Granite Canyon Quarry, a Wyoming joint venture	100%18

Harding Street Corporation, a North Carolina corporation	100%

HSMM LLC, a North Carolina limited liability company	100%

Kent Sand & Gravel Company, LLC, a North Carolina limited liability company	100%19



Mardell Trucking Company, Inc., a North Carolina corporation	100%20

Marlin Acquisition Company 2, Inc., a Delaware corporation	100%

Martin Marietta ALTN Aggregates, Inc., a Tennessee corporation	100%21

Martin Marietta ALTN Holdings, Inc., a Delaware corporation	100%22

Martin Marietta Arizona, LLC, a North Carolina limited liability company	100%23

Martin Marietta Bluegrass, LLC, a North Carolina limited liability company	100%

Martin Marietta California A&P, LLC, a North Carolina limited liability company	100%24

Martin Marietta California Ready-Mix, LLC, a Delaware limited liability company	100%25

Martin Marietta Exchange Entity, LLC, a North Carolina limited liability company	100%

Martin Marietta Fleet Management LLC, a North Carolina limited liability company	100%26

Martin Marietta Funding LLC, a Delaware limited liability company	100%

Martin Marietta Inc., a North Carolina corporation	100%

Martin Marietta Kansas City, LLC, a Delaware limited liability company	100%27

Martin Marietta Magnesia Specialties, LLC, a Delaware limited liability company	100%

Martin Marietta Marine Finance, LLC, a California limited liability company	100%28

Martin Marietta Marine Operations, LLC, a California limited liability company	100%29

Martin Marietta Materials Canada Limited, a Nova Scotia, Canada corporation	100%

Martin Marietta Materials of Missouri, Inc., a North Carolina corporation	100%

Martin Marietta Materials Real Estate Investments, Inc., a North Carolina corporation	100%

Martin Marietta Materials Southwest, LLC, a Delaware limited liability company	100%

Martin Marietta Materials West Division, LLC, a North Carolina limited liability company	100%

Martin Marietta Northern California Aggregates, LLC, a Delaware limited liability company	100%30

Martin Marietta North Texas Cement, LLC, a Delaware limited liability company	100%

Martin Marietta Pacific District Cement LLC, a Delaware limited liability company	100%31

Martin Marietta San Diego Aggregates LLC, a California limited liability company	100%32

Martin Marietta Southern California Aggregates, LLC, a Delaware limited liability company	100%33

Martin Marietta South Texas Cement, LLC, a Delaware limited liability company	100%

Martin Marietta Texas Ready-Mix, LLC, a Texas limited liability company	100%34

Martin Marietta Southeast AGG Operations, LLC, a Delaware limited liability company	100%35



Martin Marietta Southeast Aggregates, Inc., a Delaware corporation	100%

Martin Marietta Southwest Ready-Mix, Inc., a Delaware corporation	100%

Martin Marietta Stockton, LLC, a Delaware limited liability company	100%36

Martin Marietta Transportation and Distribution, LLC, a North Carolina limited liability company	100%

Material Producers, Inc., an Oklahoma corporation	100%37

Maryland Materials, Inc., a North Carolina corporation	100%38

Meridian Aggregates Company, a Limited Partnership, a North Carolina limited partnership	100%39

Meridian Aggregates Company Northwest, LLC, a North Carolina limited liability company	100%

Meridian Aggregates Investments, LLC, a North Carolina limited liability company	100%40

Meridian Granite Company, a North Carolina corporation	100%41

Mid-State Construction & Materials, Inc., an Arkansas corporation	100%

Mission Valley Rock Co., LLC, a California limited liability company	100%42

MMM Mexico I, LLC, a North Carolina limited liability company	100%43

MMM Mexico, LLC, a North Carolina limited liability company	100%44

MMMW AGG, LLC, a North Carolina limited liability company	100%45

MMMW CMT, LLC, a North Carolina limited liability company	100%46

MTD Pipeline LLC, a Delaware limited liability company	50%47

Mystic Valley LLC, a Colorado limited liability company	100%48

Northeast Land and Material Company, Inc., a North Carolina corporation	100%49

Palmetto Sand Company Inc., a South Carolina corporation	100%50

Panadero Midco, LLC, a North Carolina limited liability company	100%51

PCAz Leasing, LLC, an Arizona limited liability company	100%52

Petrillo Brothers, Inc., a North Carolina corporation	100%53

Piedras y Arenas Baja, S. de R.L. de C.V., a Mexico limited liability company	100%54

Powderly Transportation, Inc., a North Carolina corporation	100%55

Premier Magnesia, LLC, a Delaware limited liability company	100%

R&S Sand & Gravel, LLC, a North Carolina limited liability company	100%56

Riverside Cement Company, a California general partnership	100%57

Rock & Rail LLC, a Colorado limited liability company	100%



Rocky Mountain Materials and Asphalt, Inc., a Colorado corporation	100%

Rocky Mountain Premix, Inc., a Colorado corporation	100%

Rocky Mountain Ready Mix Concrete, Inc., a Colorado corporation	100%58

Royal Gorge Express, LLC, a Colorado Limited Liability Company	50%59

St. Marys Sand Company, LLC, a North Carolina limited liability company	100%60

Suburban Acquisition Company, a Colorado corporation	100%

Theodore Holding, LLC, a Delaware limited liability company	60.7%61

Tiller Corporation, a North Carolina corporation	100%

TXI Aviation, Inc. dba TXI Retail, a Texas corporation	100%62

TXI California, LLC, a Delaware limited liability company	100%63

TXI Riverside, LLC, a Delaware limited liability company	100%64

Valley Stone LLC, a Virginia limited liability company	50%65

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1560947 B.C. LTD. is a wholly owned subsidiary of Martin Marietta Materials Canada Limited.

2M Lands, LLC is a wholly owned subsidiary of Martin Marietta Materials Real Estate Investments, Inc.

Alamo Gulf Coast Railroad Company is owned by Martin Marietta Materials Southwest, LLC, (99.5%) and certain individuals (0.5%).

Alamo North Texas Railroad Company is owned by Martin Marietta Materials Southwest, LLC, (99.5%) and certain individuals (0.5%).

Albert Frei & Sons, Inc. is a wholly owned subsidiary of AR & MJ Frei Limited Partnership.

American Materials Technologies, LLC is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

Martin Marietta Materials, Inc. owns a 50% interest in American Stone Company.

AR & MJ Frei Limited Partnership is owned 98.11% by Rocky Mountain Ready Mix Concrete, Inc. (the Limited Partner). The remaining 1.89% is owned by Campbell’s C-Ment Contracting, Inc. (the General Partner).

Bahama Cement Company is a wholly owned subsidiary of Bahama Rock Limited.

Bluegrass – Blue Mount, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

Bluegrass Materials Company, LLC is a wholly owned subsidiary of Panadero Midco, LLC.

Bluegrass-St. Marys, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

Brookhollow Corporation is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

Campbell’s C-Ment Contracting, Inc. is a wholly owned subsidiary of Suburban Acquisition Company.

Carolina Quarries, Inc. is a wholly owned subsidiary of Martin Marietta Materials Real Estate Investments, Inc.

Creole Corporation is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

FRI Ready Mix of Tennessee, LLC is a wholly owned subsidiary of American Materials Technologies, LLC.

Granite Canyon Quarry is owned 51% by Meridian Granite Company and 49% by Martin Marietta Materials Real Estate Investments, Inc.

Kent Sand & Gravel Company, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

Mardell Trucking Company, Inc. is owned 50% by Bluegrass Materials Company, LLC and 50% by Petrillo Brothers, Inc.

Martin Marietta ALTN Aggregates, Inc. is a wholly owned subsidiary of Martin Marietta ALTN Holdings, Inc.

Martin Marietta ALTN Holdings, Inc. is a wholly owned subsidiary of Marlin Acquisition Company 2, Inc.

Martin Marietta Arizona, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

Martin Marietta California A&P, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

Martin Marietta California Ready-Mix, LLC is a wholly owned subsidiary of Martin Marietta Southern California Cement, LLC.

Martin Marietta Fleet Management LLC, is a wholly owned subsidiary of Martin Marietta Texas Ready-Mix, LLC.

Martin Marietta Kansas City, LLC is owned 95% by Martin Marietta Materials, Inc. and 5% by Martin Marietta Materials of Missouri, Inc.

Martin Marietta Marine Finance, LLC is a wholly owned subsidiary of Martin Marietta Northern California Aggregates, LLC.

Martin Marietta Marine Operations, LLC is a wholly owned subsidiary of Martin Marietta Northern California Aggregates, LLC.

Martin Marietta Northern California Aggregates, LLC is a wholly owned subsidiary of Martin Marietta Southern California Aggregates, LLC.

Martin Marietta Pacific District Cement LLC is a wholly owned subsidiary of MMMW CMT, LLC.

Martin Marietta San Diego Aggregates LLC is a wholly owned subsidiary of Martin Marietta Southern California Aggregates, LLC.

Martin Marietta Southern California Aggregates, LLC is a wholly owned subsidiary of MMMW AGG, LLC.

Martin Marietta Texas Ready-Mix, LLC is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

Martin Marietta Southeast AGG Operations, LLC is a wholly owned subsidiary of Martin Marietta Southeast Aggregates, Inc.

Martin Marietta Stockton, LLC is a wholly owned subsidiary of Martin Marietta Southern California Cement, LLC.

Material Producers, Inc. is a wholly owned subsidiary of Martin Marietta Materials Southwest, LLC.

Maryland Materials, Inc. is owned 50% by Bluegrass Materials Company, LLC and 50% by Petrillo Brothers, Inc.

Meridian Aggregates Company, a Limited Partnership, is owned 98% by Meridian Aggregates Investments, LLC. The remaining 2% is owned by Martin Marietta Materials, Inc.

Meridian Aggregates Investments, LLC is owned 99% by Martin Marietta Materials, Inc. and 1% by Martin Marietta Materials Real Estate Investments, Inc.

Meridian Granite Company is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

Mission Valley Rock Co., LLC is a wholly owned subsidiary of Martin Marietta Northern California Aggregates, LLC.

MMM Mexico I, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

MMM Mexico, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

MMMW AGG, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

MMMW CMT, LLC is a wholly owned subsidiary of Martin Marietta Materials West Division, LLC.

Martin Marietta Magnesia Specialties, LLC, a wholly owned subsidiary of Martin Marietta Materials, Inc., owns a 50% interest in MTD Pipeline LLC.

Mystic Valley LLC is a wholly owned subsidiary of AR & MJ Frei Limited Partnership.

Northeast Land and Material Company, Inc. is a wholly owned subsidiary of Maryland Materials, Inc.

Palmetto Sand Company Inc. is a wholly owned subsidiary of Martin Marietta Southeast AGG Operations, LLC.

Panadero Midco, LLC is a wholly owned subsidiary of Martin Marietta Bluegrass, LLC.

PCAz Leasing, LLC is a wholly owned subsidiary of Martin Marietta Arizona, LLC.

Petrillo Brothers, Inc. is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

Piedras y Arenas Baja, S. De R.L. de C.V. is owned 99.9999% by MMM Mexico, LLC and 0.0001% by MMM Mexico I, LLC.

Powderly Transportation, Inc. is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

Martin Marietta Materials, Inc. is the manager of and owns a 90% interest in R&S Sand & Gravel, LLC. The other 10% is owned by Harding Street Corporation, a wholly owned subsidiary of Martin Marietta Materials, Inc.

Riverside Cement Company is owned 49% by TXI California, LLC. and 51% by TXI Riverside LLC.

Rocky Mountain Ready Mix Concrete, Inc. is a wholly owned subsidiary of Campbell’s C-Ment Contracting, Inc.

Rock & Rail LLC, a wholly owned subsidiary of Martin Marietta Materials, Inc., owns a 50% interest in Royal Gorge Express, LLC.

St. Marys Sand Company, LLC is a wholly owned subsidiary of Bluegrass-St. Marys, LLC.

Martin Marietta Materials, Inc. is the manager of and owns a 60.7% interest in Theodore Holdings, LLC.

TXI Aviation, Inc. is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

TXI California, LLC is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

TXI Riverside, LLC is a wholly owned subsidiary of Martin Marietta Southwest Ready-Mix, Inc.

Martin Marietta Materials, Inc. is the manager of and owns a 50% interest in Valley Stone LLC.