Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionMark Asset Management Lp
Latest Disclosed Ownership1,605 shares
Latest Disclosed Value $ 944,831
Mark Asset Management Lp reports 18.53% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Mark Asset Management Lp filed a 13F-HR form disclosing ownership of 1,605 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $944,831 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,970 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -18.53% 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,605 -365 -18.53 945 -23.00 0.0861
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,970 14 0.72 1,227 -0.49 0.0813
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,956 0 0.00 1,233 14.71 0.0888
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,956 -40 -2.00 1,074 12.58 0.0837
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,996 1,996 954 0.0924
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -2,002 -100.00 0 -100.00
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,002 -11,989 -85.69 1,078 -85.78 0.0989
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,991 -40,519 -74.33 7,580 -77.35 0.7569
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 54,510 -391 -0.71 33,466 22.18 4.3521
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 54,901 -344 -0.62 27,391 20.79 3.5853
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 55,245 -246 -0.44 22,677 -11.48 4.0995
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 55,491 -146 -0.26 25,620 29.76 4.1417
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 55,637 -282 -0.50 19,743 4.47 3.6100
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 55,919 -1,471 -2.56 18,899 2.23 4.2974
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 57,390 -14 -0.02 18,485 7.61 4.5577
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 57,404 -3,239 -5.34 17,178 -26.40 4.1508
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 60,643 -6,253 -9.35 23,341 -20.79 3.4302
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 66,896 6,324 10.44 29,469 42.39 3.3501
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 60,572 -137 -0.23 20,696 -3.10 2.2335
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 60,709 -2,111 -3.36 21,358 1.24 2.6292
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 62,820 13,189 26.57 21,096 49.68 3.1622
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 49,631 14,740 42.25 14,094 71.63 1.6883
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 34,891 -3,213 -8.43 8,212 4.33 1.1829
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 38,104 3,417 9.85 7,871 19.91 1.4861
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 34,687 14,526 72.05 6,564 16.42 1.5121
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 20,161 -8,159 -28.81 5,638 -27.37 0.9417
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 28,320 -5,359 -15.91 7,763 0.17 1.9329
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 33,679 33,679 7,750 1.8046
2019-05-13 2019-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 0 -38,461 -100.00 0 -100.00
2019-02-12 2018-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 38,461 -6,969 -15.34 6,610 -20.03 1.7872
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 45,430 -2,514 -5.24 8,266 -22.80 1.9561
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 47,944 -1,006 -2.06 10,707 5.52 2.6284
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 48,950 -5,100 -9.44 10,147 -15.07 2.7196
2018-02-14 2017-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 54,050 -15,337 -22.10 11,947 -16.51 2.9938
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 69,387 -847 -1.21 14,310 -8.46 3.1146
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 70,234 -5,240 -6.94 15,633 -5.09 3.5175
2017-05-15 2017-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 75,474 -6,653 -8.10 16,472 -9.46 3.8101
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 82,127 28,712 53.75 18,194 90.17 4.7503
2016-11-15 2016-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 53,415 5,750 12.06 9,567 4.53 2.5490
2016-08-15 2016-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 47,665 5,665 13.49 9,152 36.62 2.7010
2016-05-13 2016-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 42,000 42,000 6,699 1.9407
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.