Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionShell Asset Management Co
Latest Disclosed Ownership2,745 shares
Latest Disclosed Value $ 1,730
Shell Asset Management Co reports 55.89% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 2,745 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $1,730,119 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 6,223 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -55.89% during the quarter. The current value of the position is $1,600,747 USD.

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)
2025-11-07 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,745 -3,478 -55.89 2 -66.67 0.1738
2025-07-23 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,223 2,634 73.39 3 200.00 0.1180
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,589 -215 -5.65 2 0.00 0.0815
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,804 -163 -4.11 2 -50.00 0.0858
2024-11-07 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,967 -19 -0.48 2 0.00 0.0940
2024-07-25 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,986 -3,685 -48.04 2 -33.33 0.0984
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,671 -2,018 -20.83 4 0.00 0.1768
2023-11-08 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,689 -196 -1.98 4 -25.00 0.1643
2023-07-28 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,885 -1,452 -12.81 5 0.00 0.1800
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,337 212 1.91 4 33.33 0.1670
2023-02-07 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,125 4,506 68.08 4 -99.86 0.1647
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,619 -1,879 -22.11 2,132 -16.16 0.0831
2022-08-09 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,498 2,052 31.83 2,543 2.50 0.0752
2022-05-04 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,446 -405 -5.91 2,481 -17.79 0.0586
2022-02-09 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 6,851 1,004 17.17 3,018 51.05 0.0619
2021-11-04 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,847 3,171 118.50 1,998 112.33 0.0449
2021-08-12 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,676 -1,886 -41.34 941 -38.58 0.0182
2021-05-10 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,562 -5,151 -53.03 1,532 -44.45 0.0307
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,713 1,391 16.71 2,758 40.79 0.0569
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,322 -443 -5.05 1,959 8.17 0.0455
2020-08-10 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,765 -1,259 -12.56 1,811 -4.53 0.0452
2020-05-11 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,024 -400 -3.84 1,897 -34.92 0.0529
2020-02-13 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,424 368 3.66 2,915 5.77 0.0628
2019-11-12 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,056 -100 -0.98 2,756 17.93 0.0629
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,156 -1,990 -16.38 2,337 -4.38 0.0517
2019-05-09 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,146 0 0.00 2,444 17.05 0.0539
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,146 -2,465 -16.87 2,088 -21.44 0.0520
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 14,611 601 4.29 2,658 -15.05 0.0525
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 14,010 -1,577 -10.12 3,129 -3.16 0.0641
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 15,587 10,681 217.71 3,231 198.06 0.0643
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,906 2,012 69.52 1,084 81.57 0.0215
2017-10-20 2017-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 2,894 -951 -24.73 597 -30.26 0.0133
2017-10-18 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,282 3,437 939
2017-07-26 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,845 -170 -4.23 856 -2.28 0.0212
2017-04-26 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,015 -347 -7.96 876 -9.32 0.0224
2017-01-10 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,362 -397 -8.34 966 13.38 0.0261
2016-10-28 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,759 -480 -9.16 852 -15.31 0.0204
2016-07-25 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,239 2,585 97.40 1,006 137.83 0.0233
2016-05-11 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,654 -189 -6.65 423 9.02 0.0101
2016-02-05 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,843 -4,439 -60.96 388 -58.68 0.0092
2015-10-13 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,282 2,472 51.39 939 37.89 0.0149
2015-07-30 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,810 -185 -3.70 681 -2.44 0.0136
2015-05-07 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,995 4,995 0.00 698 0.0122
2015-02-04 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -7,282 -100.00 0 -100.00
2014-10-24 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,282 -2 -0.03 939 -2.39 0.0146
2014-08-08 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,284 -622 -7.87 962 -5.22 0.0148
2014-05-07 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,906 0 0.00 1,015 28.48 0.0169
2014-02-03 2013-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 7,906 -5,112 -39.27 790 -38.18 0.0134
2014-01-27 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,906 790
2013-10-28 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,018 642 5.19 1,278 4.93 0.0235
2013-08-01 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,376 12,376 1,218 0.0232
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.