EXHIBIT 21.01

SUBSIDIARIES OF MARTIN MARIETTA MATERIALS, INC.

AS OF JANUARY 31, 2021

	Percent
Name of Subsidiary	Owned
Alamo Gulf Coast Railroad Company, a Texas corporation	99.5%1
Alamo North Texas Railroad Company, a Texas corporation	99.5%2
American Aggregates Corporation, a North Carolina corporation	100%
American Materials Technologies, LLC, a Tennessee limited liability company	100%3
American Stone Company, a North Carolina corporation	50%4
Bahama Rock Limited, a Bahamas corporation	100%
Bluegrass – Blue Mount, LLC, a Delaware limited liability company	100%5
Bluegrass Materials Company, LLC, a Delaware limited liability company	100%6
Bluegrass-St. Marys, LLC, a Delaware limited liability company	100%7
Brookhollow of Alexandria, Inc., a Louisiana corporation	100%8
Brookhollow Corporation, a Delaware corporation	100%9
Brook Hollow Properties, Inc., a Texas corporation	100%10
California Natural Aggregates, Inc., a California corporation	100%11
Campbell’s C-Ment Contracting, Inc., a Colorado corporation	100%12
CIG MC LLC, a Colorado limited liability company	100%
Creole Corporation, a Delaware corporation	100%13
FRI Ready Mix of Tennessee, LLC, a Florida limited liability company	100%14
Front Range Aggregates LLC, a Delaware limited liability company	100%
Granite Canyon Quarry, a Wyoming joint venture	100%15
Harding Street Corporation, a North Carolina corporation	100%
HSMM LLC, a North Carolina limited liability company	100%
Kent Sand & Gravel Company, LLC, a Delaware limited liability company	100%16
Mardell Trucking Company, Inc., a Delaware corporation	100%17
Martin Marietta Bluegrass, LLC, a Delaware limited liability company	100%18
Martin Marietta Composites, Inc., a Delaware corporation	100%
Martin Marietta Fleet Management LLC, a North Carolina limited liability company	100%19
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%20
Martin Marietta Magnesia Specialties, LLC, a Delaware limited liability company	100%
Martin Marietta Materials Canada Limited, a Nova Scotia, Canada corporation	100%
Martin Marietta Materials of Missouri, Inc., a Delaware corporation	100%
Martin Marietta Materials Real Estate Investments, Inc., a North Carolina corporation	100%
Martin Marietta Materials Southwest, LLC, a Texas limited liability company	100%21
Material Producers, Inc., an Oklahoma corporation	100%22
Maryland Materials, Inc., a Delaware corporation	100%23
Meridian Aggregates Company, a Limited Partnership, a North Carolina limited partnership	100%24
Meridian Aggregates Company Northwest, LLC, a North Carolina limited liability company	100%
Meridian Aggregates Company Southwest, LLC, a North Carolina limited liability company	100%25
Meridian Aggregates Investments, LLC, a North Carolina limited liability company	100%26
Meridian Granite Company, a North Carolina corporation	100%27
Mid-State Construction & Materials, Inc., an Arkansas corporation	100%
MTD Pipeline LLC, a Delaware limited liability company	50%28
North East Land and Material Company, Inc., a Maryland corporation	100%29
Panadero Corp., a Delaware corporation	100%
Panadero Midco, LLC, a Delaware limited liability company	100%30
Partin Limestone Products, Inc., a California corporation	100%31
Petrillo Brothers, Inc., a Delaware corporation	100%32
Powderly Transportation, Inc., a North Carolina corporation	100%33
R&S Sand & Gravel, LLC, a North Carolina limited liability company	100%34
Ratliff Mix Management, LLC, a Texas limited liability company	100%35
Ratliff Ready‑Mix, LP, a Texas limited partnership	100%36
Riverside Cement Company, a California partnership	100%37
Riverside Cement Holdings Company, a Delaware corporation	100%38
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%39
Royal Gorge Express, LLC, a Colorado Limited Liability Company	50%40
Southwestern Financial Corporation, a Texas Corporation	100%41
St. Marys Sand Company, LLC, a Delaware limited liability company	100%42
Suburban Acquisition Company, a Colorado corporation	100%
Texas Industries Holdings, LLC, a Delaware limited liability company	100%43
Texas Industries, Inc., a Delaware corporation	100%
Texas Industries Trust, a Delaware trust	100%44
Theodore Holding, LLC, a Delaware limited liability company	60.7%45
TXI Aviation, Inc. dba TXI Retail, a Texas corporation	100%46
TXI California Inc., a Delaware corporation	100%47
TXI Cement Company, a Delaware corporation	100%48
TXI LLC, a Delaware limited liability company	100%49
TXI Operating Trust, a Delaware trust	100%50
TXI Operations, LP, a Delaware limited partnership	100%51
TXI Power Company, a Texas corporation	100%52
TXI Riverside Inc., a Delaware corporation	100%53
TXI Transportation Company, a Texas corporation	100%54
Valley Stone LLC, a Virginia limited liability company	50%55

¹  Alamo Gulf Coast Railroad Company is owned by Martin Marietta Materials Southwest, LLC, (99.5%) and certain    individuals (0.5%).

²  Alamo North Texas Railroad Company is owned by Martin Marietta Materials Southwest, LLC, (99.5%) and certain individuals (0.5%).

³  American Materials Technologies, LLC is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

⁴  Martin Marietta Materials, Inc. owns a 50% interest in American Stone Company.

⁵  Bluegrass – Blue Mount, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

⁶  Bluegrass Materials Company, LLC is a wholly owned subsidiary of Panadero Midco, LLC.

⁷  Bluegrass-St. Marys, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

⁸  Brookhollow of Alexandria, Inc. is a wholly owned subsidiary of Brookhollow Corporation.

⁹  Brookhollow Corporation is a wholly owned subsidiary of Texas Industries, Inc.

¹⁰  Brook Hollow Properties, Inc. is a wholly owned subsidiary of Brookhollow Corporation.

¹¹  California Natural Aggregates, Inc. is a wholly owned subsidiary of Texas Industries, Inc.

¹²  Campbell’s C-Ment Contracting, Inc. is a wholly-owned subsidiary of Suburban Acquisition Company.

¹³  Creole Corporation is a wholly owned subsidiary of Texas Industries, Inc.

¹⁴    FRI Ready Mix of Tennessee, LLC is a wholly owned subsidiary of American Materials Technologies, LLC.

¹⁵  Granite Canyon Quarry is owned 51% by Meridian Granite Company and 49% by Martin Marietta Materials Real Estate Investments, Inc.

¹⁶  Kent Sand & Gravel Company, LLC is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

¹⁷  Mardell Trucking Company, Inc. is owned 50% by Bluegrass Materials Company, LLC and 50% by Petrillo Brothers, Inc.

¹⁸  Martin Marietta Bluegrass, LLC is owned 61.62% by Panadero Corp. and 38.38% by Martin Marietta Materials, Inc.

¹⁹  Martin Marietta Fleet Management LLC, is a wholly owned subsidiary of Martin Marietta Materials Southwest, LLC

²⁰  Martin Marietta Kansas City, LLC is owned 95% by Martin Marietta Materials, Inc. and 5% by Martin Marietta Materials of Missouri, Inc.

²¹  Martin Marietta Materials Southwest, LLC is a wholly owned subsidiary of Texas Industries, Inc.

²²  Material Producers, Inc. is a wholly owned subsidiary of Martin Marietta Materials Southwest, LLC

²³  Maryland Materials, Inc. is owned 50% by Bluegrass Materials Company, LLC and 50% by Petrillo Brothers, Inc.

²⁴  Meridian Aggregates Company, a Limited Partnership, is owned 98% by Meridian Aggregates Investments, LLC.  The remaining 2% is owned by Martin Marietta Materials, Inc.

²⁵  Martin Marietta Materials Southwest, LLC is the sole member of Meridian Aggregates Company Southwest, LLC.

²⁶  Meridian Aggregates Investments, LLC is owned 99% by Martin Marietta Materials, Inc. and 1% by Martin Marietta Materials Real Estate Investments, Inc.

²⁷  Meridian Granite Company is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

²⁸  Martin Marietta Magnesia Specialties, LLC, a wholly owned subsidiary of Martin Marietta Materials, Inc., owns a 50% interest in MTD Pipeline LLC.

²⁹  North East Land and Material Company, Inc. is a wholly owned subsidiary of Maryland Materials, Inc.

³⁰  Panadero Midco, LLC is a wholly owned subsidiary of Martin Marietta Bluegrass, LLC.

³¹  Partin Limestone Products, Inc. is a wholly owned subsidiary of Riverside Cement Company.

³²  Petrillo Brothers, Inc. is a wholly owned subsidiary of Bluegrass Materials Company, LLC.

³³  Powderly Transportation, Inc. is a wholly owned subsidiary of Meridian Aggregates Company, a Limited Partnership.

³⁴  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.

³⁵  Ratliff Mix Management, LLC is a wholly owned subsidiary of TXI Operations, LP.

³⁶  Ratliff Ready-Mix, LP is owned 99% by TXI Operations, LP and 1% by Ratliff Mix Management, LLC.

³⁷  Riverside Cement Company is owned 49% by TXI California, Inc. and 51% by TXI Riverside Inc.

³⁸  Riverside Cement Holdings Company is a wholly owned subsidiary of Riverside Cement Company.

³⁹  Rocky Mountain Ready Mix Concrete, Inc. is a wholly owned subsidiary of Campbell’s C-Ment Contracting, Inc.

⁴⁰  Rock & Rail LLC, a wholly owned subsidiary of Martin Marietta Materials, Inc., owns a 50% interest in Royal Gorge Express, LLC

⁴¹  Southwestern Financial Corporation is a wholly owned subsidiary of TXI Operations, LP.

⁴²  St. Marys Sand Company, LLC is a wholly owned subsidiary of Bluegrass-St. Marys, LLC.

⁴³  Texas Industries Holdings, LLC is a wholly owned subsidiary of Texas Industries, Inc.

⁴⁴  Texas Industries Trust is owned 100% by Texas Industries Holdings, LLC.

⁴⁵  Martin Marietta Materials, Inc. is the manager of and owns a 60.7% interest in Theodore Holdings, LLC.

⁴⁶  TXI Aviation, Inc. is a wholly owned subsidiary of Texas Industries, Inc.

⁴⁷  TXI California Inc. is a wholly owned subsidiary of Texas Industries, Inc.

⁴⁸  TXI Cement Company is a wholly owned subsidiary of Texas Industries, Inc.

⁴⁹  TXI, LLC is a wholly owned subsidiary of Texas Industries, Inc.

⁵⁰  TXI Operating Trust is owned 100% by TXI LLC.

⁵¹  TXI Operations, LP is owned 99% by Texas Industries Trust and owned 1% by TXI Operating Trust.

⁵²  TXI Power Company is a wholly owned subsidiary of Texas Industries, Inc.

⁵³  TXI Riverside Inc. is a wholly owned subsidiary of Texas Industries, Inc.

⁵⁴  TXI Transportation Company is a wholly owned subsidiary of Texas Industries, Inc.

⁵⁵  Martin Marietta Materials, Inc. is the manager of and owns a 50% interest in Valley Stone LLC.