Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionMitchell Capital Management Co
Latest Disclosed Ownership7,341 shares
Latest Disclosed Value $ 4,321,500
Mitchell Capital Management Co reports 2.43% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 11, 2026 - Mitchell Capital Management Co filed a 13F-HR form disclosing ownership of 7,341 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $4,321,500 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 7,167 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 2.43% during the quarter. The current value of the position is $4,280,904 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)
2026-05-11 2026-03-31 13F Martin Marietta COM 573284106 7,341 174 2.43 4,322 -3.16 0.7930
2026-02-10 2025-12-31 13F Martin Marietta COM 573284106 7,167 -3,456 -32.53 4,463 -33.35 0.7978
2025-11-06 2025-09-30 13F Martin Marietta COM 573284106 10,623 249 2.40 6,695 14.23 1.1462
2025-07-25 2025-06-30 13F Martin Marietta COM 573284106 10,374 -1,205 -10.41 5,862 5.87 1.0958
2025-05-09 2025-03-31 13F Martin Marietta COM 573284106 11,579 -304 -2.56 5,536 -9.79 1.0554
2025-02-05 2024-12-31 13F Martin Marietta COM 573284106 11,883 -301 -2.47 6,138 -6.42 1.0749
2024-11-12 2024-09-30 13F Martin Marietta COM 573284106 12,184 6,040 98.31 6,558 97.06 1.1461
2024-08-08 2024-06-30 13F Martin Marietta COM 573284106 6,144 118 1.96 3,329 -10.03 0.5861
2024-05-06 2024-03-31 13F Martin Marietta COM 573284106 6,026 122 2.07 3,700 25.60 0.7099
2024-02-13 2023-12-31 13F Martin Marietta COM 573284106 5,904 141 2.45 2,946 24.52 0.6202
2023-11-03 2023-09-30 13F Martin Marietta COM 573284106 5,763 30 0.52 2,366 -10.62 0.5618
2023-08-08 2023-06-30 13F Martin Marietta COM 573284106 5,733 53 0.93 2,647 31.25 0.6052
2023-05-08 2023-03-31 13F Martin Marietta COM 573284106 5,680 61 1.09 2,017 6.16 0.5002
2023-02-13 2022-12-31 13F Martin Marietta COM 573284106 5,619 -58 -1.02 1,899 3.83 0.5252
2022-10-28 2022-09-30 13F Martin Marietta COM 573284106 5,677 200 3.65 1,829 11.59 0.5191
2022-07-29 2022-06-30 13F Martin Marietta COM 573284106 5,477 141 2.64 1,639 -20.20 0.4592
2022-04-29 2022-03-31 13F Martin Marietta COM 573284106 5,336 105 2.01 2,054 -10.85 0.4596
2022-01-28 2021-12-31 13F Martin Marietta COM 573284106 5,231 188 3.73 2,304 33.72 0.4666
2021-11-02 2021-09-30 13F Martin Marietta COM 573284106 5,043 2,740 118.98 1,723 112.72 0.3860
2021-08-10 2021-06-30 13F Martin Marietta COM 573284106 2,303 150 6.97 810 12.03 0.1778
2021-04-29 2021-03-31 13F Martin Marietta COM 573284106 2,153 187 9.51 723 29.57 0.1764
2021-02-08 2020-12-31 13F Martin Marietta COM 573284106 1,966 131 7.14 558 29.17 0.1401
2020-11-10 2020-09-30 13F Martin Marietta COM 573284106 1,835 66 3.73 432 18.36 0.1254
2020-07-29 2020-06-30 13F Martin Marietta COM 573284106 1,769 1,769 365 0.1175
2019-02-08 2018-12-31 13F Martin Marietta COM 573284106 0 -17,898 -100.00 0 -100.00
2018-11-08 2018-09-30 13F Martin Marietta COM 573284106 17,898 -16,950 -48.64 3,257 -58.15 1.0576
2018-08-10 2018-06-30 13F Martin Marietta COM 573284106 34,848 6,861 24.51 7,783 34.14 2.8105
2018-05-04 2018-03-31 13F Martin Marietta COM 573284106 27,987 -2,890 -9.36 5,802 -14.99 2.0962
2018-02-13 2017-12-31 13F Martin Marietta COM 573284106 30,877 10,100 48.61 6,825 59.28 2.4031
2017-10-31 2017-09-30 13F Martin Marietta COM 573284106 20,777 -374 -1.77 4,285 -8.98 1.5627
2017-07-27 2017-06-30 13F Martin Marietta COM 573284106 21,151 -209 -0.98 4,708 0.99 1.7999
2017-05-05 2017-03-31 13F Martin Marietta COM 573284106 21,360 -683 -3.10 4,662 -4.53 1.7343
2017-02-09 2016-12-31 13F Martin Marietta COM 573284106 22,043 -382 -1.70 4,883 21.56 1.8532
2016-11-09 2016-09-30 13F Martin Marietta COM 573284106 22,425 22,425 4,017 1.5025
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.