Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionKing Luther Capital Management Corp
Latest Disclosed Ownership666,722 shares
Latest Disclosed Value $ 392,485,907
King Luther Capital Management Corp reports 3.39% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 8, 2026 - King Luther Capital Management Corp filed a 13F-HR form disclosing ownership of 666,722 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $392,485,907 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 690,128 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -3.39% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-08 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 666,722 -23,406 -3.39 392,486 -8.66 1.6956
2026-02-09 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 690,128 5,025 0.73 429,715 -0.48 1.7476
2025-11-07 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 685,103 -5,801 -0.84 431,807 13.85 1.7789
2025-08-07 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 690,904 -19,349 -2.72 379,279 11.69 1.6463
2025-05-12 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 710,253 -7,096 -0.99 339,593 -8.34 1.5680
2025-02-07 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 717,349 -496 -0.07 370,511 -4.11 1.6034
2024-11-08 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 717,845 -2,043 -0.28 386,380 -0.94 1.6584
2024-08-12 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 719,888 -16,576 -2.25 390,035 -13.74 1.7578
2024-05-14 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 736,464 49,063 7.14 452,145 31.84 2.0395
2024-02-09 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 687,401 68 0.01 342,951 21.56 1.6489
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 687,333 19,897 2.98 282,136 -8.44 1.4647
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 667,436 1,719 0.26 308,149 30.37 1.5311
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 665,717 -5,520 -0.82 236,369 4.19 1.2490
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 671,237 2,367 0.35 226,858 5.30 1.2438
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 668,870 1,519 0.23 215,436 7.88 1.2862
2022-08-11 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 667,351 -6 -0.00 199,698 -22.25 1.1174
2022-05-11 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 667,357 7,292 1.10 256,859 -11.66 1.2531
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 660,065 1,120 0.17 290,772 29.15 1.3157
2021-11-10 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 658,945 -2,750 -0.42 225,148 -3.28 1.1065
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 661,695 1,215 0.18 232,791 4.95 1.1379
2021-05-12 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 660,480 3,712 0.57 221,802 18.93 1.1909
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 656,768 -14,023 -2.09 186,502 18.13 1.0495
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 670,791 -6,677 -0.99 157,877 12.81 0.9966
2020-08-12 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 677,468 43,159 6.80 139,945 16.59 0.9706
2020-05-13 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 634,309 13,761 2.22 120,030 -30.83 1.0393
2020-02-12 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 620,548 2,095 0.34 173,530 2.37 1.1600
2019-11-12 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 618,453 -9,915 -1.58 169,518 17.24 1.2334
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 628,368 -2,877 -0.46 144,594 13.86 1.0550
2019-05-10 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 631,245 7,026 1.13 126,994 18.37 0.9712
2019-02-12 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 624,219 -47,323 -7.05 107,285 -12.20 0.9544
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 671,542 -78,772 -10.50 122,187 -27.08 0.9223
2018-08-13 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 750,314 12,862 1.74 167,568 9.61 1.3708
2018-05-08 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 737,452 34,840 4.96 152,874 -1.57 1.2788
2018-02-12 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 702,612 11,917 1.73 155,305 9.03 1.2701
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 690,695 20,725 3.09 142,442 -4.48 1.2475
2017-08-10 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 669,970 17,740 2.72 149,122 4.76 1.3486
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 652,230 -10,954 -1.65 142,349 -3.11 1.3088
2017-02-10 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 663,184 -21,540 -3.15 146,915 19.79 1.3975
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 684,724 -21,640 -3.06 122,641 -9.57 1.1977
2016-08-11 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 706,364 -47,445 -6.29 135,622 12.79 1.3275
2016-05-12 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 753,809 -50,861 -6.32 120,240 9.41 1.1946
2016-02-12 2015-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 804,670 28,295 3.64 109,902 -6.84 1.0304
2016-02-11 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 804,670 28,295 109,902 1.0304
2015-11-13 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 776,375 -16,367 -2.06 117,970 5.16 1.1446
2015-08-11 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 792,742 -32,257 -3.91 112,181 -2.73 0.9682
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 824,999 10,646 1.31 115,335 28.38 0.9665
2015-02-11 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 814,353 -17,143 -2.06 89,839 -16.21 0.7244
2014-11-12 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 831,496 53,744 6.91 107,213 4.39 0.8799
2014-08-13 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 777,752 -10,153 -1.29 102,702 1.56 0.8121
2014-05-14 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 787,905 126,328 19.09 101,128 52.95 0.8239
2014-02-12 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 661,577 -2,868 -0.43 66,118 1.36 0.5333
2013-11-13 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 664,445 14,810 2.28 65,229 2.02 0.5596
2013-08-13 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 649,635 649,635 63,937 0.5955
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.