Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionARS Investment Partners, LLC
Latest Disclosed Ownership6,908 shares
Latest Disclosed Value $ 4,066,601
ARS Investment Partners, LLC reports 2.17% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On April 16, 2026 - ARS Investment Partners, LLC filed a 13F-HR form disclosing ownership of 6,908 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $4,066,601 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 7,061 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -2.17% 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)
2026-04-16 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,908 -153 -2.17 4,067 -7.51 0.2114
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,061 -18 -0.25 4,397 -1.46 0.2569
2025-10-15 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,079 -96 -1.34 4,462 13.28 0.2946
2025-08-11 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,175 -22,579 -75.89 3,939 -74.37 0.2873
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 29,754 -54 -0.18 15,368 -0.18 1.3906
2025-01-16 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 29,808 -91 -0.30 15,396 -4.34 1.3872
2024-10-16 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 29,899 135 0.45 16,093 -0.20 1.4424
2024-07-17 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 29,764 -5,644 -15.94 16,126 -25.82 1.5422
2024-05-02 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 35,408 -7,801 -18.05 21,739 0.84 2.1661
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 43,209 -581 -1.33 21,558 19.93 2.3887
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 43,790 8 0.02 17,975 -11.07 2.2281
2023-07-11 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 43,782 -1,270 -2.82 20,214 26.36 2.3620
2023-04-05 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 45,052 195 0.43 15,996 5.51 1.9206
2023-01-25 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 44,857 3,854 9.40 15,160 14.79 2.0167
2022-10-07 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 41,003 1,153 2.89 13,207 10.75 1.8160
2022-07-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 39,850 -320 -0.80 11,925 -22.87 1.6291
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 40,170 -45 -0.11 15,461 -12.73 1.4907
2022-02-11 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 40,215 -256 -0.63 17,716 28.12 1.6271
2021-11-05 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 40,471 -5,109 -11.21 13,828 -13.77 1.3838
2021-08-06 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 45,580 99 0.22 16,036 5.00 1.6344
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 45,481 1,880 4.31 15,273 23.36 1.7740
2021-02-09 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 43,601 546 1.27 12,381 22.18 1.5240
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 43,055 43,055 10,133 1.5928
2020-02-12 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -49,906 -100.00 0 -100.00
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 49,906 -1,321 -2.58 13,679 16.04 2.4575
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 51,227 545 1.08 11,788 15.61 1.9814
2019-05-09 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 50,682 27,913 122.59 10,196 160.57 1.8455
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 22,769 22,769 3,913 0.8281
2017-02-15 2016-12-31 13F Martin Marietta Materials COM 573284106 0 -21,097 -100.00 0 -100.00
2016-11-09 2016-09-30 13F Martin Marietta Materials COM 573284106 21,097 2,970 16.38 3,779 8.59 0.8284
2016-08-10 2016-06-30 13F Martin Marietta Materials COM 573284106 18,127 18,127 3,480 0.7795
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.