Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionCWM Advisors, LLC
Latest Disclosed Ownership2,713 shares
Latest Disclosed Value $ 1,597,088
CWM Advisors, LLC reports 419.73% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - CWM Advisors, LLC filed a 13F-HR/A form disclosing ownership of 2,713 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $1,597,089 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 522 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 419.73% during the quarter. The current value of the position is $1,582,086 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/A-1 MARTIN MARIETTA MATLS COM 573284106 2,713 2,191 419.73 1,597 391.38 0.3204
2026-04-23 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 573 51 337 0.0278
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 522 27 5.45 325 4.50 0.0292
2025-10-15 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 495 -19 -3.70 312 10.28 0.0304
2025-07-24 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 514 -137 -21.04 282 -9.32 0.0307
2025-06-03 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 651 -1,590 -70.95 311 -73.12 0.0370
2025-01-17 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,241 115 5.41 1,157 1.14 0.1295
2024-10-10 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,126 19 0.90 1,144 0.26 0.1171
2024-08-12 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,107 -1,813 -46.25 1,142 -52.58 0.1316
2024-05-07 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,920 -867 -18.11 2,407 0.75 0.2462
2024-02-12 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,787 1,543 47.56 2,388 79.41 0.2627
2023-10-26 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,244 361 12.52 1,332 0.00 0.1700
2023-07-31 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,883 1,666 136.89 1,331 208.10 0.1610
2023-04-24 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,217 38 3.22 432 8.54 0.0550
2023-01-26 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,179 121 11.44 398 16.72 0.0513
2022-11-07 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,058 -116 -9.88 341 -2.85 0.0482
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,174 91 8.40 351 -15.83 0.0466
2022-04-21 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,083 -57 -5.00 417 -16.93 0.0483
2022-02-14 2021-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,140 -10 -0.87 502 27.74 0.0576
2021-11-09 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,150 -4,475 -79.56 393 -80.14 0.0497
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,625 274 5.12 1,979 10.13 0.2604
2021-04-30 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,351 1,330 33.08 1,797 57.36 0.2756
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,021 176 4.58 1,142 26.19 0.2526
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,845 -301 -7.26 905 5.72 0.2490
2020-08-12 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,146 1,064 34.52 856 46.83 0.2956
2020-05-08 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,082 -323 -9.49 583 -38.76 0.2329
2020-01-24 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,405 -48 -1.39 952 0.63 0.3414
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,453 175 5.34 946 25.46 0.3607
2019-07-16 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,278 -28 -0.85 754 13.38 0.3172
2019-05-16 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,306 811 32.51 665 55.01 0.3088
2019-02-21 2018-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 2,495 165 7.08 429 1.18 0.2884
2019-02-21 2018-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 2,330 526 29.16 424 5.21 0.2613
2018-11-07 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,329 2,329 424
2019-02-21 2018-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,804 666 58.52 403 70.76 0.2864
2019-02-22 2018-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,138 135 13.46 236 6.31 0.2404
2019-02-21 2017-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,003 1,003 222 0.1887
2018-02-15 2017-12-31 13F Martin Marietta Materials COM 573284106 104 23 0.0183
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.