Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionPrincipal Street Partners, LLC
Latest Disclosed Ownership1,162 shares
Latest Disclosed Value $ 684,046
Principal Street Partners, LLC reports 0.94% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Principal Street Partners, LLC filed a 13F-HR form disclosing ownership of 1,162 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $684,046 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,173 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.94% during the quarter. The current value of the position is $677,620 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,162 -11 -0.94 684 -6.30 0.1117
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,173 0 0.00 730 -1.22 0.1232
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,173 -35 -2.90 739 11.46 0.1180
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,208 -47 -3.75 663 10.50 0.0650
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,255 100 8.66 600 0.67 0.1116
2025-02-18 2024-12-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,155 0 0.00 597 -4.03 0.1173
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,155 0 0.00 622 -0.64 0.1017
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,155 -101 -8.04 626 -18.83 0.1121
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,256 -13 -1.02 771 21.64 0.1457
2024-02-07 2023-12-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,269 -181 -12.48 633 6.39 0.1527
2023-11-01 2023-09-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,450 -141 -8.86 595 -18.94 0.1179
2023-08-21 2023-06-30 13F/A-1 MARTIN MARIETTA MATERIALS Common stock 573284106 1,591 3 0.19 735 30.37 0.1746
2023-08-15 2023-06-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,588 0 564 0.1425
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,588 -311 -16.38 564 -12.17 0.1425
2023-02-15 2022-12-31 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,899 -55 -2.81 642 1.91 0.1617
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,954 47 2.46 629 10.16 0.1676
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATERIALS Common stock 573284106 1,907 -183 -8.76 571 -28.98 0.1479
2022-05-05 2022-03-31 13F Martin Marietta Materials Common stock 573284106 2,090 339 19.36 804 4.15 0.1843
2022-02-07 2021-12-31 13F Martin Marietta Materials Common stock 573284106 1,751 -238 -11.97 772 13.53 0.1858
2021-11-10 2021-09-30 13F Martin Marietta Materials Common stock 573284106 1,989 -623 -23.85 680 -26.01 0.1853
2021-08-10 2021-06-30 13F Martin Marietta Materials Common stock 573284106 2,612 -3,398 -56.54 919 -54.46 0.2424
2021-05-13 2021-03-31 13F Martin Marietta Materials Common stock 573284106 6,010 2,683 80.64 2,018 113.54 0.2604
2021-02-16 2020-12-31 13F Martin Marietta Materials Common stock 573284106 3,327 37 1.12 945 22.09 0.2894
2020-11-12 2020-09-30 13F Martin Marietta Materials Common stock 573284106 3,290 0 0.00 774 13.82 0.2719
2020-08-14 2020-06-30 13F Martin Marietta Materials Common stock 573284106 3,290 0 0.00 680 9.15 0.2540
2020-05-14 2020-03-31 13F Martin Marietta Materials Common stock 573284106 3,290 122 3.85 623 -29.60 0.2615
2020-03-04 2019-12-31 13F Martin Marietta Materials Common stock 573284106 3,168 -690 -17.88 885 -16.03 0.1972
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS INC COM Common stock 573284106 3,858 -58 -1.48 1,054 16.98 0.2639
2019-08-15 2019-06-30 13F MARTIN MARIETTA MATLS INC COM Common stock 573284106 3,916 951 32.07 901 51.17 0.4971
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS INC COM Common stock 573284106 2,965 2,965 596 0.2592
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.