Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionUtah Retirement Systems
Latest Disclosed Ownership9,735 shares
Latest Disclosed Value $ 5,730,800
Utah Retirement Systems reports 1.64% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Utah Retirement Systems filed a 13F-HR form disclosing ownership of 9,735 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $5,730,800 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,897 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -1.64% 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 9,735 -162 -1.64 5,731 -7.01 0.0586
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,897 0 0.00 6,162 -1.20 0.0586
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,897 -159 -1.58 6,238 12.99 0.0606
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,056 -116 -1.14 5,520 13.51 0.0576
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,172 0 0.00 4,864 -7.42 0.0561
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,172 0 0.00 5,254 -4.05 0.0579
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,172 38 0.37 5,475 -0.27 0.0618
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,134 -558 -5.22 5,491 -16.36 0.0652
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,692 0 0.00 6,564 23.06 0.0768
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,692 47 0.44 5,334 22.09 0.0679
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,645 25 0.24 4,370 -10.89 0.0625
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,620 -439 -3.97 4,903 24.89 0.0680
2023-05-16 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,059 34 0.31 3,927 5.37 0.0568
2023-02-15 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,025 -162 -1.45 3,726 3.41 0.0591
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,187 130 1.18 3,603 8.88 0.0601
2022-08-16 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,057 0 0.00 3,309 -22.25 0.0530
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,057 -169 -1.51 4,256 -13.93 0.0566
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,226 0 0.00 4,945 28.91 0.0611
2021-11-16 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,226 -560 -4.75 3,836 -7.50 0.0519
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,786 -100 -0.84 4,147 3.88 0.0534
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,886 -500 -4.04 3,992 13.47 0.0556
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,386 500 4.21 3,518 25.78 0.0499
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,886 100 0.85 2,797 14.87 0.0464
2020-08-13 2020-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 11,786 -100 -0.84 2,435 8.27 0.0447
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,786 -100 2,435 44,692.1017
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,886 0 0.00 2,249 -32.34 0.0487
2020-02-12 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,886 100 0.85 3,324 2.88 0.0584
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,786 0 0.00 3,231 19.14 0.0615
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,786 -100 -0.84 2,712 13.43 0.0519
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,886 136 1.16 2,391 18.42 0.0474
2019-02-08 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,750 100 0.86 2,019 -4.76 0.0457
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,120 -18.52 0.0411
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,602 7.74 0.0539
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,415 -6.21 0.0514
2018-02-14 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,650 200 1.75 2,575 9.02 0.0541
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,450 0 0.00 2,362 -7.30 0.0531
2017-08-08 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,450 -200 -1.72 2,548 0.24 0.0594
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,542 -1.51 0.0608
2017-02-10 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,581 23.67 0.0649
2016-11-07 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,650 0 0.00 2,087 -6.71 0.0540
2016-08-03 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,650 -600 -4.90 2,237 14.48 0.0596
2016-05-10 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,250 100 0.82 1,954 17.78 0.0530
2016-02-11 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,150 100 0.83 1,659 -9.39 0.0450
2015-11-03 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,050 0 0.00 1,831 7.39 0.0524
2015-08-11 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,050 1,000 9.05 1,705 10.36 0.0453
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,050 300 2.79 1,545 30.27 0.0406
2015-02-11 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,750 0 0.00 1,186 -14.43 0.0326
2014-11-06 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,750 2,700 33.54 1,386 30.39 0.0397
2014-08-08 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,050 -300 -3.59 1,063 -0.84 0.0305
2014-05-08 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,350 100 1.21 1,072 29.94 0.0309
2014-02-05 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,250 0 0.00 825 1.98 0.0244
2013-11-06 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,250 -100 -1.20 809 -1.58 0.0262
2013-08-02 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,350 8,350 822 0.0278
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.