Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionHarvey Capital Management Inc
Latest Disclosed Ownership14,490 shares
Latest Disclosed Value $ 8,529,973
Harvey Capital Management Inc reports 0.77% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 11, 2026 - Harvey Capital Management Inc filed a 13F-HR form disclosing ownership of 14,490 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $8,529,973 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 14,602 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.77% 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)
2026-05-11 2026-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 14,490 -112 -0.77 8,530 -6.19 1.9440
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 14,602 -13 -0.09 9,092 -1.29 1.9389
2025-10-31 2025-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 14,615 -503 -3.33 9,212 9.25 1.9656
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,118 -190 -1.24 8,431 15.19 1.9749
2025-04-30 2025-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,308 1,422 10.24 7,319 2.05 1.9151
2025-01-29 2024-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 13,886 0 0.00 7,172 -4.04 1.6880
2024-10-29 2024-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,886 -30 -0.22 7,474 -0.86 1.8686
2024-07-22 2024-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,916 -204 -1.44 7,540 -13.02 1.9818
2024-05-10 2024-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 14,120 -815 -5.46 8,669 16.33 2.5363
2024-01-29 2023-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 14,935 -260 -1.71 7,451 19.46 2.4729
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,195 -1,425 -8.57 6,237 -18.71 2.1953
2023-08-04 2023-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 16,620 -605 -3.51 7,673 25.48 2.8208
2023-05-17 2023-03-31 13F/A-1 MARTIN MARIETTA MATERIALS COM 573284106 17,225 -195 -1.12 6,116 3.87 2.4109
2023-05-16 2023-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,420 0 5,887 2.4656
2023-02-27 2022-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 17,420 3,935 29.18 5,887 35.55 2.4656
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,485 0 0.00 4,343 7.63 1.8810
2022-08-08 2022-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,485 -110 -0.81 4,035 -22.88 1.5737
2022-04-22 2022-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 13,595 -20 -0.15 5,232 -12.76 1.6149
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 13,615 -100 -0.73 5,997 27.98 1.8593
2021-10-25 2021-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,715 -65 -0.47 4,686 -3.32 1.6051
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,780 195 1.44 4,847 6.25 1.5989
2021-05-07 2021-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 13,585 375 2.84 4,562 21.62 1.6545
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 13,210 -90 -0.68 3,751 19.84 1.5220
2020-10-27 2020-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,300 690 5.47 3,130 20.20 1.3965
2020-08-05 2020-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 12,610 12,610 2,604 1.2885
2020-04-29 2020-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 0 -900 -100.00 0 -100.00
2020-02-04 2019-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 900 -3,000 -76.92 251 -76.50 0.1114
2019-10-17 2019-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,900 -7,571 -66.00 1,068 -59.53 0.5306
2019-07-23 2019-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 11,471 100 0.88 2,639 15.39 1.2696
2019-04-17 2019-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 11,371 -650 -5.41 2,287 10.70 1.0989
2019-01-31 2018-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 12,021 -135 -1.11 2,066 -6.56 1.0988
2018-10-24 2018-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 12,156 -18,275 -60.05 2,211 -67.47 0.8802
2018-08-07 2018-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 30,431 -250 -0.81 6,796 6.86 2.6977
2018-04-27 2018-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 30,681 -2,745 -8.21 6,360 -13.91 2.3807
2018-02-02 2017-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 33,426 975 3.00 7,388 10.40 2.6774
2017-11-08 2017-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 32,451 193 0.60 6,692 -6.78 2.7000
2017-07-19 2017-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 32,258 0 0.00 7,179 1.97 3.0773
2017-04-18 2017-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 32,258 14,240 79.03 7,040 76.40 3.1627
2017-01-27 2016-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 18,018 18,018 3,991 1.8590
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.