Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership546,170 shares
Latest Disclosed Value $ 321,442,054
Dimensional Fund Advisors Lp reports 1.07% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 546,170 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $321,442,054 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 540,406 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 1.07% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 546,170 5,764 1.07 321,442 -4.49 0.0144
2026-02-12 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 540,406 -8 -0.00 336,542 -1.18 0.0706
2025-11-12 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 540,414 -35,907 -6.23 340,547 7.63 0.0731
2025-08-12 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 576,321 -55,198 -8.74 316,395 4.79 0.0733
2025-05-13 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 631,519 -9,845 -1.54 301,922 -8.87 0.0750
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 641,364 14,892 2.38 331,296 -1.75 0.0796
2024-11-07 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 626,472 2,791 0.45 337,205 -0.21 0.0818
2024-08-09 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 623,681 12,759 2.09 337,903 -9.91 0.0883
2024-05-10 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 610,922 -4,474 -0.73 375,069 22.16 0.1015
2024-02-07 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 615,396 27,775 4.73 307,026 27.27 0.0897
2023-11-09 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 587,621 6,588 1.13 241,238 -10.07 0.0791
2023-08-09 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 581,033 28,377 5.13 268,249 36.72 0.0855
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 552,656 10,261 1.89 196,207 107,116.39 0.0661
2023-02-09 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 542,395 -9,442 -1.71 183 -99.90 0.0542
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 551,837 -29,498 -5.07 177,752 2.19 0.0682
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 581,335 -5,320 -0.91 173,943 -22.97 0.0624
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 586,655 -33,124 -5.34 225,825 -17.28 0.0696
2022-02-09 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 619,779 -17,320 -2.72 273,006 25.37 0.0825
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 637,099 -5,533 -0.86 217,762 -3.68 0.0701
2021-08-12 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 642,632 -10,610 -1.62 226,084 3.03 0.0716
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 653,242 -278 -0.04 219,428 18.25 0.0726
2021-03-08 2020-12-31 13F/A-2 MARTIN MARIETTA MATLS COM 573284106 653,520 2,402 0.37 185,562 21.12 0.0670
2021-02-11 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 653,520 2,402 185,562 67,015.1312
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 651,118 7,819 1.22 153,206 15.29 0.0650
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 643,299 16,295 2.60 132,884 12.06 0.0584
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 627,004 413 0.07 118,587 -32.32 0.0618
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 626,591 3,633 0.58 175,210 2.62 0.0639
2019-11-12 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 622,958 -3,478 -0.56 170,735 18.46 0.0663
2019-08-13 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 626,436 2,832 0.45 144,131 14.90 0.0560
2019-08-12 2019-03-31 13F/A-2 MARTIN MARIETTA MATLS COM 573284106 623,604 30,978 5.23 125,440 23.18 0.0500
2019-05-10 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 623,604 30,978 125,440
2019-02-26 2018-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 592,626 45,693 8.35 101,838 2.30 0.0461
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 592,626 45,693 101,838
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 546,933 109,467 25.02 99,545 1.90 0.0379
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 437,466 26,382 6.42 97,691 14.64 0.0389
2018-05-11 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 411,084 18,814 4.80 85,218 -1.71 0.0355
2018-02-12 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 392,270 9,110 2.38 86,697 9.72 0.0359
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 383,160 -12,916 -3.26 79,014 -10.37 0.0345
2017-08-11 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 396,076 -112 -0.03 88,157 1.99 0.0407
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 396,188 -6,796 -1.69 86,437 -3.19 0.0413
2017-02-09 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 402,984 -47,675 -10.58 89,289 10.60 0.0446
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 450,659 52,774 13.26 80,730 5.70 0.0436
2016-08-09 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 397,885 18,296 4.82 76,373 26.17 0.0439
2016-05-13 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 379,589 474 0.13 60,531 16.90 0.0362
2016-02-10 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 379,115 -14,758 -3.75 51,782 -13.47 0.0323
2015-11-13 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 393,873 64,784 19.69 59,843 28.49 0.0393
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 329,089 8,515 2.66 46,574 3.91 0.0285
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 320,574 11,541 3.73 44,820 31.46 0.0283
2015-02-06 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 309,033 -79,702 -20.50 34,093 -31.99 0.0224
2014-11-13 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 388,735 226,547 139.68 50,126 134.05 0.0355
2014-08-08 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 162,188 10,600 6.99 21,417 10.09 0.0149
2014-05-14 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 151,588 2,423 1.62 19,454 30.49 0.0145
2014-02-12 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 149,165 4,853 3.36 14,908 5.25 0.0116
2013-11-13 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 144,312 2,926 2.07 14,165 1.77 0.0123
2013-08-15 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 141,386 141,386 13,918 0.0131
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.