마틴 마리에타 머티리얼즈, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionSmartleaf Asset Management LLC
Latest Disclosed Ownership2,003 shares
Latest Disclosed Value $ 1,148,951
Smartleaf Asset Management LLC reports 7.17% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Smartleaf Asset Management LLC filed a 13F-HR form disclosing ownership of 2,003 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,148,951 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,869 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 7.17% 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 2,003 134 7.17 1,149 -2.71 0.0415
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,869 157 9.17 1,180 11.01 0.0447
2025-11-05 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,712 490 40.10 1,064 58.18 0.0658
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,222 135 12.42 672 29.48 0.0592
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,087 226 26.25 520 16.11 0.0501
2025-02-05 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 861 362 72.55 448 66.17 0.0457
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 499 224 81.45 269 81.76 0.0327
2024-10-08 2024-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 275 65 30.95 148 15.63 0.0243
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 275 65 148 0.0243
2024-10-07 2024-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 210 187 813.04 128 1,063.64 0.0249
2024-05-03 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 210 187 61 0.0147
2024-02-12 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 23 23 11 0.0031
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.