Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership101,479 shares
Latest Disclosed Value $ 59,739
Natixis Advisors, L.p. reports 1.63% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 101,479 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $59,738,658 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 103,162 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -1.63% during the quarter. The current value of the position is $59,177,479 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)
2026-05-13 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 101,479 -1,683 -1.63 60 -7.81 0.0831
2026-02-10 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 103,162 1,722 1.70 64 1.59 0.0910
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS INC COM 573284106 101,440 639 0.63 64 14.55 0.0933
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 100,801 11,303 12.63 55 30.95 0.0878
2025-05-08 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 89,498 -10,855 -10.82 43 -17.65 0.0791
2025-02-10 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 100,353 2,799 2.87 52 -1.92 0.0968
2024-11-06 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 97,554 4,513 4.85 53 4.00 0.1024
2024-08-01 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 93,041 -30,312 -24.57 50 -33.33 0.1096
2024-04-25 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 123,353 -11,023 -8.20 76 11.94 0.1741
2024-02-06 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 134,376 -274 -0.20 67 21.82 0.1765
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 134,650 -2,027 -1.48 55 -12.70 0.1690
2023-08-15 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 136,677 117,052 596.44 63 950.00 0.1948
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 19,625 -271 -1.36 7 0.00 0.0240
2023-01-27 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 19,896 944 4.98 7 -99.90 0.0254
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 18,952 1,804 10.52 6,104 18.96 0.0258
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,148 109 0.64 5,131 -21.76 0.0226
2022-05-12 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,039 2,675 18.62 6,558 3.63 0.0250
2022-02-08 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,364 1,543 12.03 6,328 44.44 0.0242
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,821 -2,287 -15.14 4,381 -17.57 0.0180
2021-08-12 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 15,108 1,900 14.39 5,315 19.84 0.0248
2021-05-05 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 13,208 2,316 21.26 4,435 43.39 0.0231
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,892 791 7.83 3,093 30.12 0.0178
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,101 -408 -3.88 2,377 9.49 0.0150
2020-08-11 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,509 284 2.78 2,171 12.20 0.0144
2020-04-27 2020-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 10,225 10,225 1,935 0.0158
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -12,790 -100.00 0 -100.00
2018-08-14 2018-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 12,790 228 1.81 2,856 9.68 0.0273
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,790 2,856
2018-05-10 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,562 249 2.02 2,604 -4.34 0.0257
2018-02-14 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,313 12,313 2,722 0.0277
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.