Martin Marietta Materials, Inc.
DE ˙ DB ˙ US5732841060
499,80 € ↑4,40 (0,89%)
2026-06-04
CENA AKCJI
SecurityDE:MMX / Martin Marietta Materials, Inc.
InstitutionSteginsky Capital Llc
Latest Disclosed Ownership128,350 shares
Latest Disclosed Value $ 75,557
Steginsky Capital Llc reports 7.28% increase in ownership of MMX / Martin Marietta Materials, Inc.

On May 4, 2026 - Steginsky Capital Llc filed a 13F-HR form disclosing ownership of 128,350 shares of Martin Marietta Materials, Inc. (DE:MMX) valued at $64,483,040 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 119,635 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 7.28% during the quarter. The current value of the position is $64,149,330 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)
2026-05-04 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 128,350 8,715 7.28 76 1.35 12.4873
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 119,635 -18 -0.02 74 -1.33 12.5527
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 119,653 891 0.75 75 15.38 13.8469
2025-08-12 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 118,762 4,751 4.17 65 20.37 13.3304
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 114,011 1,724 1.54 55 -5.26 12.1902
2025-02-11 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 112,287 2,964 2.71 58 -1.72 12.4205
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 109,323 904 0.83 59 0.00 13.3551
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 108,419 -269 -0.25 59 -12.12 13.4943
2024-05-13 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 108,688 403 0.37 67 22.22 16.0661
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 108,285 -263 -0.24 54 22.73 14.8829
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 108,548 -338 -0.31 45 -12.00 13.6941
2023-07-13 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 108,886 2,675 2.52 50 35.14 15.7030
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 106,211 -4,796 -4.32 38 0.00 13.4588
2023-01-31 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 111,007 178 0.16 38 -99.90 13.8560
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 110,829 1,811 1.66 35,697 9.42 13.5576
2022-07-26 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 109,018 11,959 12.32 32,623 -23.70 11.6554
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 97,059 0 0.00 42,756 0.00 14.0071
2022-02-10 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 97,059 -1 -0.00 42,756 28.93 14.0071
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 97,060 -395 -0.41 33,163 -3.28 12.4596
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 97,455 -881 -0.90 34,286 3.82 13.7233
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 98,336 -534 -0.54 33,023 17.62 15.3526
2021-02-08 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 98,870 429 0.44 28,076 21.18 14.0108
2020-10-30 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 98,441 4,688 5.00 23,169 19.63 13.0989
2020-08-03 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 93,753 889 0.96 19,367 10.21 12.1337
2020-05-22 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 92,864 8,038 9.48 17,573 -25.92 12.2540
2020-01-22 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 84,826 -166 -0.20 23,721 1.82 13.7053
2019-11-01 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 84,992 -830 -0.97 23,296 17.96 14.3490
2019-08-02 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 85,822 3,632 4.42 19,749 19.44 12.9078
2019-05-09 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 82,190 1,099 1.36 16,535 18.64 11.7685
2019-02-07 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 81,091 16,669 25.87 13,937 18.90 10.9597
2018-11-13 2018-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 64,422 19,784 44.32 11,722 17.58 9.0794
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 43,244 -1,394 8,918
2018-08-03 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 44,638 -1,805 -3.89 9,969 3.54 8.9648
2018-05-10 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 46,443 8,259 21.63 9,628 14.08 8.6655
2018-02-07 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 38,184 -5,060 -11.70 8,440 -5.36 7.9009
2017-11-03 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 43,244 5,550 14.72 8,918 6.29 8.1094
2017-08-11 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 37,694 -45,890 -54.90 8,390 -54.01 8.2425
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 83,584 -2,640 -3.06 18,242 -4.50 15.8443
2017-02-13 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 86,224 86,224 19,101 17.1966
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.