Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionArizona State Retirement System
Latest Disclosed Ownership16,381 shares
Latest Disclosed Value $ 9,643,167
Arizona State Retirement System reports 1.18% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 1, 2026 - Arizona State Retirement System filed a 13F-HR form disclosing ownership of 16,381 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $9,643,167 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 16,577 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -1.18% 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)
2026-05-01 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 16,381 -196 -1.18 9,643 -6.57 0.0564
2026-01-28 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 16,577 -1,292 -7.23 10,322 -8.36 0.0561
2025-11-03 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,869 47 0.26 11,262 15.12 0.0600
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,822 147 0.83 9,784 15.78 0.0564
2025-05-01 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,675 -77 -0.43 8,451 -7.83 0.0538
2025-02-06 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,752 92 0.52 9,169 -3.55 0.0560
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,660 706 4.16 9,505 3.48 0.0600
2024-08-05 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16,954 -46 -0.27 9,186 -11.99 0.0613
2024-05-07 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,000 14 0.08 10,437 23.15 0.0722
2024-01-24 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 16,986 79 0.47 8,474 22.12 0.0643
2023-11-07 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 16,907 -13 -0.08 6,940 -11.16 0.0590
2023-08-01 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16,920 -1,131 -6.27 7,812 21.88 0.0634
2023-04-27 2023-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 18,051 396 2.24 6,409 7.43 0.0575
2023-02-08 2022-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,655 531 3.10 5,967 8.18 0.0576
2022-11-07 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,124 -290 -1.67 5,515 5.83 0.0570
2022-07-28 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,414 50 0.29 5,211 -22.03 0.0506
2022-05-04 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,364 381 2.24 6,683 -10.67 0.0538
2022-02-04 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 16,983 -520 -2.97 7,481 25.10 0.0570
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 17,503 -102 -0.58 5,980 -3.45 0.0488
2021-08-02 2021-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 17,605 -350 -1.95 6,194 2.72 0.0504
2021-05-06 2021-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,955 99 0.55 6,030 18.91 0.0527
2021-01-28 2020-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,856 -1,083 -5.72 5,071 13.78 0.0460
2020-11-05 2020-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 18,939 4,451 30.72 4,457 48.91 0.0443
2020-08-04 2020-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 14,488 105 0.73 2,993 9.96 0.0422
2020-05-05 2020-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 14,383 2,647 22.55 2,722 -17.06 0.0468
2020-01-27 2019-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 11,736 76 0.65 3,282 2.69 0.0395
2019-10-31 2019-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 11,660 -223 -1.88 3,196 16.90 0.0390
2019-07-25 2019-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 11,883 -105 -0.88 2,734 13.35 0.0317
2019-04-29 2019-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 11,988 -897 -6.96 2,412 8.89 0.0287
2019-01-28 2018-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 12,885 -2,733 -17.50 2,215 -22.06 0.0285
2018-10-29 2018-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,618 176 1.14 2,842 -17.60 0.0268
2018-08-07 2018-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,442 -22,586 -59.39 3,449 -56.25 0.0347
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 38,028 -1,800 -4.52 7,883 -10.46 0.0796
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 39,828 -4,899 -10.95 8,804 -4.55 0.0858
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 44,727 29,227 188.56 9,224 167.36 0.1102
2017-08-02 2017-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,500 -100 -0.64 3,450 1.32 0.0478
2017-05-10 2017-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,600 -100 -0.64 3,405 -2.10 0.0478
2017-02-10 2016-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,700 100 0.64 3,478 24.48 0.0512
2016-11-01 2016-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,600 0 0.00 2,794 -6.71 0.0424
2016-08-15 2016-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,600 -1,800 -10.34 2,995 7.93 0.0420
2016-05-16 2016-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,400 -700 -3.87 2,775 12.26 0.0361
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 18,100 -200 -1.09 2,472 -11.11 0.0329
2015-11-20 2015-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 18,300 1,000 5.78 2,781 45.75 0.0390
2015-02-11 2014-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,300 200 1.17 1,908 -13.43 0.0225
2014-11-21 2014-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 17,100 -13,207 -43.58 2,204 -44.93 0.0273
2014-08-07 2014-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 30,307 600 2.02 4,002 4.98 0.0484
2014-05-19 2014-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 29,707 -3,300 -10.00 3,812 15.59 0.0483
2014-02-05 2013-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 33,007 -3,200 -8.84 3,298 -7.20 0.0406
2013-11-01 2013-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 36,207 200 0.56 3,554 0.31 0.0455
2013-09-17 2013-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 36,007 300 0.84 3,543 -2.72 0.0483
2013-09-17 2013-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 35,707 35,707 3,642 0.0522
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.