Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionStephens Inc /ar/
Latest Disclosed Ownership56,111 shares
Latest Disclosed Value $ 33,031,168
Stephens Inc /ar/ reports 9.32% increase in ownership of MLM / Martin Marietta Materials, Inc.

On April 28, 2026 - Stephens Inc /ar/ filed a 13F-HR form disclosing ownership of 56,111 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $33,031,423 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 51,326 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 9.32% during the quarter. The current value of the position is $32,592,635 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)
2026-04-28 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 56,111 4,785 9.32 33,031 3.36 0.4132
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 51,326 5,150 11.15 31,958 9.81 0.3976
2025-10-27 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 46,176 -2,201 -4.55 29,104 9.59 0.3709
2025-07-29 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 48,377 2,649 5.79 26,557 21.46 0.3650
2025-05-01 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 45,728 13,485 41.82 21,864 31.29 0.3204
2025-01-28 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 32,243 -8,376 -20.62 16,654 -23.83 0.2335
2024-10-28 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 40,619 2,788 7.37 21,863 6.66 0.3102
2024-08-06 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 37,831 -892 -2.30 20,497 -13.78 0.3127
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 38,723 45 0.12 23,774 23.20 0.3687
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 38,678 7,512 24.10 19,297 50.83 0.3329
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 31,166 815 2.69 12,793 -8.70 0.2452
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 30,351 18,409 154.15 14,013 230.47 0.2521
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,942 153 1.30 4,240 6.43 0.0813
2023-02-14 2022-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 11,789 -64 -0.54 3,984 4.35 0.0816
2023-01-25 2022-12-31 13F MARTIN MARIETTA MATLS OM 573284106 11,789 -64 4 0.0816
2022-11-02 2022-09-30 13F MARTIN MARIETTA MATLS OM 573284106 11,853 225 1.93 3,818 9.71 0.0815
2022-08-03 2022-06-30 13F MARTIN MARIETTA MATLS OM 573284106 11,628 96 0.83 3,480 -21.60 0.0702
2022-05-04 2022-03-31 13F MARTIN MARIETTA MATLS OM 573284106 11,532 -249 -2.11 4,439 -14.47 0.0724
2022-03-07 2021-12-31 13F MARTIN MARIETTA MATLS OM 573284106 11,781 -513 -4.17 5,190 23.54 0.0785
2021-10-27 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,294 -588 -4.56 4,201 -7.30 0.0650
2021-08-12 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,882 -156 -1.20 4,532 3.52 0.0679
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 13,038 228 1.78 4,378 20.34 0.0719
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,810 -167 -1.29 3,638 19.12 0.0653
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,977 -125 -0.95 3,054 12.86 0.0601
2020-08-24 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,102 1,221 10.28 2,706 20.37 0.0582
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,881 -2,452 -17.11 2,248 -43.91 0.0599
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,333 -646 -4.31 4,008 -2.39 0.0840
2019-10-18 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 14,979 -452 -2.93 4,106 15.63 0.0903
2019-08-01 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 15,431 228 1.50 3,551 16.08 0.0804
2019-05-03 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 15,203 2,773 22.31 3,059 43.21 0.0726
2019-02-11 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,430 642 5.45 2,136 -0.42 0.0606
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,788 273 2.37 2,145 -16.60 0.0534
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,515 -447 -3.74 2,572 3.71 0.0777
2018-05-03 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,962 27 0.23 2,480 -5.99 0.0925
2018-02-05 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,935 1,011 9.25 2,638 17.09 0.0987
2017-11-08 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,924 1,006 10.14 2,253 2.04 0.0814
2017-08-10 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,918 -2,213 -18.24 2,208 -16.62 0.0758
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,131 2,629 27.67 2,648 25.80 0.0963
2017-02-09 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,502 -2,675 -21.97 2,105 -3.48 0.0858
2016-11-30 2016-09-30 13F/A-2 MARTIN MARIETTA MATLS COM 573284106 12,177 -635 -4.96 2,181 -11.34 0.0955
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,177 2,181
2016-08-05 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,812 -176 -1.36 2,460 18.73 0.1097
2016-05-05 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,988 336 2.66 2,072 19.91 0.1014
2016-02-10 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,652 -1,288 -9.24 1,728 -18.41 0.0867
2015-11-03 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,940 -3,683 -20.90 2,118 -15.08 0.1103
2015-07-29 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,623 -383 -2.13 2,494 -0.91 0.1131
2015-05-06 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 18,006 179 1.00 2,517 27.96 0.1147
2015-02-12 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,827 -1,263 -6.62 1,967 -20.07 0.0931
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 19,090 19,090 2,461 0.1217
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.