Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionNational Asset Management, Inc.
Latest Disclosed Ownership447 shares
Latest Disclosed Value $ 256,525
National Asset Management, Inc. reports 5.67% increase in ownership of MLM / Martin Marietta Materials, Inc.

On April 24, 2026 - National Asset Management, Inc. filed a 13F-HR form disclosing ownership of 447 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $256,525 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 423 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 5.67% 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)
2026-04-24 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 447 24 5.67 257 -2.66 0.0162
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 423 39 10.16 264 8.68 0.0122
2025-10-31 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 384 384 242 0.0112
2025-08-19 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -4,442 -100.00 0 -100.00
2025-02-25 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,442 -807 -15.37 2,294 -17.54 0.0752
2024-12-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,249 -243 -4.42 2,782 -6.49 0.0774
2024-12-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,249 -243 2,782 0.0774
2024-08-19 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,492 -805 -12.78 2,976 15.13 0.0757
2024-05-16 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,297 952 17.81 2,585 -3.08 0.0699
2024-03-15 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,345 -952 -15.12 2,667 3.17 0.0718
2023-12-01 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,297 364 6.14 2,585 -5.66 0.0699
2023-07-27 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,933 282 4.99 2,739 36.54 0.0614
2023-05-17 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,651 -160 -2.75 2,006 2.14 0.0535
2023-03-15 2022-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 5,811 -103 -1.74 1,964 3.10 0.0550
2023-02-21 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,811 -103 1,964 0.0494
2022-11-22 2022-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 5,914 4,568 339.38 1,905 372.70 0.0575
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,914 4,568 1,905 0.0276
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,346 -1,643 -54.97 403 -64.99 0.0170
2022-05-02 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,989 56 1.91 1,151 -10.91 0.0377
2022-01-28 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,933 296 11.22 1,292 43.40 0.0372
2021-11-16 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,637 390 17.36 901 13.91 0.0287
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,247 53 2.42 791 7.33 0.0257
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,194 2,194 737 0.0261
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -15 -100.00 0 -100.00
2015-02-18 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 15 15 2 0.0000
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.