Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionFirst Manhattan Co
Latest Disclosed Ownership35,062 shares
Latest Disclosed Value $ 20,640,298
First Manhattan Co reports 0.12% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 35,062 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $20,640,298 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 35,105 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.12% during the quarter. The current value of the position is $20,446,405 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 MATLS COM 573284106 35,062 -43 -0.12 20,640 -5.57 0.0572
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 35,105 -619 -1.73 21,858 -2.92 0.0574
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 35,724 -169 -0.47 22,516 14.28 0.0595
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 35,893 298 0.84 19,704 15.77 0.0556
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 35,595 978 2.83 17,019 -4.81 0.0496
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 34,617 196 0.57 17,880 -3.50 0.0524
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 34,421 474 1.40 18,527 0.73 0.0549
2024-08-15 2024-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 33,947 409 1.22 18,392 -10.68 0.0590
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 33,947 409 18,392 0.0590
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 33,538 -60 -0.18 20,591 22.84 0.0667
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 33,598 -3,310 -8.97 16,763 10.65 0.0582
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 36,908 -298 -0.80 15,150 -11.81 0.0559
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 37,206 0 0.00 17,178 30.03 0.0629
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 37,206 -7,269 -16.34 13,210 -12.11 0.0507
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 44,475 -517 -1.15 15,031 3.73 0.0551
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 44,992 -9 -0.02 14,491 7.61 0.0614
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 45,001 -103 -0.23 13,466 -22.43 0.0543
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 45,104 -135 -0.30 17,360 -12.89 0.0568
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 45,239 -480 -1.05 19,928 27.57 0.0657
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 45,719 -1,482 -3.14 15,621 -5.93 0.0575
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 47,201 0 0.00 16,605 4.76 0.0606
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 47,201 -140 -0.30 15,851 17.91 0.0683
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 47,341 -1,040 -2.15 13,443 18.07 0.0643
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 48,381 -125 -0.26 11,386 13.64 0.0587
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 48,506 45,788 1,684.62 10,019 1,849.22 0.0579
2020-05-06 2020-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 2,718 0 0.00 514 -32.37 0.0033
2020-02-13 2019-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 2,718 -50,823 -94.92 760 -94.82 0.0038
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 53,541 -6,225 -10.42 14,675 6.71 0.0808
2019-08-16 2019-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 59,766 -2,200 -3.55 13,752 10.32 0.0763
2019-04-12 2019-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 61,966 -1,515 -2.39 12,466 14.26 0.0720
2019-01-30 2018-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 63,481 -64,900 -50.55 10,910 -53.29 0.0679
2018-10-15 2018-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 128,381 -1,215 -0.94 23,358 -19.29 0.1245
2018-08-01 2018-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 129,596 4,195 3.35 28,942 11.34 0.1669
2018-04-20 2018-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 125,401 1,685 1.36 25,995 -4.94 0.1479
2018-01-22 2017-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 123,716 116,523 1,619.95 27,346 1,743.96 0.1498
2017-10-25 2017-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 7,193 3,895 118.10 1,483 102.04 0.0085
2017-08-10 2017-06-30 13F/A-2 MARTIN MARIETTA MATL COMMON 573284106 3,298 0 0.00 734 2.09 0.0043
2017-08-01 2017-06-30 13F/A-1 MARTIN MARIETTA MATL COMMON 573284106 3,298 0 734 0.0043
2017-07-28 2017-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 3,298 0 734
2017-04-25 2017-03-31 13F/A-1 MARTIN MARIETTA MATL COMMON 573284106 3,298 0 0.00 719 -1.51 0.0043
2017-04-24 2017-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 2,886 516
2017-01-25 2016-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 3,298 412 14.28 730 41.47 0.0044
2016-10-20 2016-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 2,886 0 0.00 516 -6.86 0.0031
2016-07-14 2016-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 2,886 0 0.00 554 20.43 0.0034
2016-04-22 2016-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 2,886 -704 -19.61 460 -6.12 0.0028
2016-01-20 2015-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 3,590 -3,719 -50.88 490 -55.86 0.0030
2015-10-26 2015-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 7,309 400 5.79 1,110 13.61 0.0071
2015-07-17 2015-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 6,909 0 0.00 977 1.24 0.0058
2015-04-30 2015-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 6,909 0 0.00 965 26.64 0.0056
2015-01-20 2014-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 6,909 0 0.00 762 -14.38 0.0043
2014-10-23 2014-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 6,909 6,205 881.39 890 856.99 0.0052
2014-08-14 2014-06-30 13F/A-1 MARTIN MARIETTA MATL COMMON 573284106 704 0 0.00 93 3.33 0.0006
2014-05-16 2014-03-31 13F MARTIN MARIETTA MATL COMMON 573284106 704 0 0.00 90 28.57 0.0006
2014-02-04 2013-12-31 13F MARTIN MARIETTA MATL COMMON 573284106 704 0 0.00 70 1.45 0.0005
2013-10-29 2013-09-30 13F MARTIN MARIETTA MATL COMMON 573284106 704 0 0.00 69 -2.82 0.0005
2013-08-13 2013-06-30 13F MARTIN MARIETTA MATL COMMON 573284106 704 704 71 0.0005
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.