Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionTower Research Capital LLC (TRC)
Latest Disclosed Ownership975 shares
Latest Disclosed Value $ 573,963
Tower Research Capital LLC (TRC) reports 56.95% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Tower Research Capital LLC (TRC) filed a 13F-HR form disclosing ownership of 975 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $573,963 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,265 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -56.95% 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 975 -1,290 -56.95 574 -59.36 0.0098
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,265 864 61.67 1,410 59.68 0.0341
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,401 -3,091 -68.81 883 -64.18 0.0244
2025-08-15 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,492 2,825 169.47 2,466 212.03 0.0665
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,667 -2,938 -63.80 790 -66.78 0.0235
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,605 1,571 51.78 2,378 45.62 0.0472
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,034 1,286 73.57 1,633 72.44 0.0432
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,748 -1,012 -36.67 947 -44.10 0.0160
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,760 -5,524 -66.68 1,694 -59.00 0.0408
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,284 4,984 151.03 4,133 205.17 0.0510
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,300 1,461 79.45 1,355 59.48 0.0424
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,839 852 86.32 849 0.0283
2023-05-09 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 987 -2,303 -70.00 0 -100.00 0.0111
2023-02-10 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,290 -2,885 -46.72 1 -99.95 0.0461
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,175 2,280 58.54 1,989 70.73 0.0323
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,895 -7,612 -66.15 1,165 -73.70 0.0261
2022-05-12 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,507 7,419 181.48 4,429 145.92 0.0423
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,088 2,056 101.18 1,801 159.14 0.0312
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,032 -288 -12.41 695 -14.83 0.0177
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,320 -1,920 -45.28 816 -42.70 0.0212
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,240 1,594 60.24 1,424 89.61 0.0240
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,646 737 38.61 751 67.26 0.0229
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,909 138 7.79 449 22.68 0.0050
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,771 -2,085 -54.07 366 -49.79 0.0150
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,856 3,856 729 0.0443
2020-02-07 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -968 -100.00 0 -100.00
2019-11-05 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 968 -210 -17.83 265 -2.21 0.0182
2019-08-13 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,178 -520 -30.62 271 -20.53 0.0183
2019-05-14 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,698 -778 -31.42 341 -19.95 0.0207
2019-02-14 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,476 758 44.12 426 36.10 0.0307
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,718 640 59.37 313 29.88 0.0229
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,078 1,078 241 0.0135
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -400 -100.00 0 -100.00
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 400 400 88 0.0114
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -16 -100.00 0 -100.00
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16 -84 -84.00 4 -81.82 0.0005
2017-05-19 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 100 -772 -88.53 22 -88.60 0.0022
2017-02-03 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 872 774 789.80 193 972.22 0.0210
2016-11-08 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 98 -317 -76.39 18 -77.50 0.0018
2016-08-10 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 415 -363 -46.66 80 -35.48 0.0076
2016-05-16 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 778 505 184.98 124 235.14 0.0185
2016-02-10 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 273 273 0.00 37 0.0060
2015-11-13 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -715 -100.00 0 -100.00
2015-07-30 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 715 -1,385 -65.95 101 -65.65 0.0090
2015-05-12 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,100 1,712 441.24 294 600.00 0.0363
2015-02-05 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 388 388 0.00 42 0.0126
2014-10-31 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -4,566 -100.00 0 -100.00
2014-08-14 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,566 3,666 407.33 603 419.83 0.0775
2014-05-02 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 900 104 13.07 116 45.00 0.0149
2014-01-31 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 796 715 882.72 80 900.00 0.0134
2013-11-06 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 81 -437 -84.36 8 -84.31 0.0009
2013-08-05 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 518 518 51 0.0041
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.