Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionBessemer Group Inc
Latest Disclosed Ownership8,309 shares
Latest Disclosed Value $ 4,892
Bessemer Group Inc reports 4.10% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 6, 2026 - Bessemer Group Inc filed a 13F-HR form disclosing ownership of 8,309 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $4,891,342 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 7,982 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 4.10% during the quarter. The current value of the position is $4,845,393 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)
2026-05-06 2026-03-31 13F MARTIN MARIETTA MATL SC 573284106 8,309 327 4.10 5 0.00 0.0077
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATL SC 573284106 7,982 2,453 44.37 5 33.33 0.0076
2025-11-05 2025-09-30 13F MARTIN MARIETTA MATL SC 573284106 5,529 1,196 27.60 3 50.00 0.0053
2025-08-01 2025-06-30 13F MARTIN MARIETTA MATL SC 573284106 4,333 54 1.26 2 0.00 0.0039
2025-04-23 2025-03-31 13F MARTIN MARIETTA MATL SC 573284106 4,279 -62 -1.43 2 0.00 0.0037
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATL SC 573284106 4,341 -217 -4.76 2 0.00 0.0037
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATL SC 573284106 4,558 64 1.42 2 0.00 0.0040
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATL SC 573284106 4,494 -176 -3.77 2 0.00 0.0043
2024-08-13 2024-03-31 13F/A-1 MARTIN MARIETTA MATL SC 573284106 4,670 319 7.33 3 0.00 0.0052
2024-05-13 2024-03-31 13F MARTIN MARIETTA MATL SC 573284106 4,670 319 3 0.0052
2024-02-09 2023-12-31 13F MARTIN MARIETTA MATL SC 573284106 4,351 -652 -13.03 2 0.00 0.0042
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATL SC 573284106 5,003 -424 -7.81 2 0.00 0.0045
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATL SC 573284106 5,427 401 7.98 3 100.00 0.0053
2023-05-10 2023-03-31 13F MARTIN MARIETTA MATL SC 573284106 5,026 -232 -4.41 2 0.00 0.0042
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATL SC 573284106 5,258 -824 -13.55 2 -99.95 0.0043
2022-11-09 2022-09-30 13F MARTIN MARIETTA MATL SC 573284106 6,082 132 2.22 1,960 10.11 0.0051
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATL SC 573284106 5,950 -414 -6.51 1,780 -27.32 0.0044
2022-05-12 2022-03-31 13F MARTIN MARIETTA MATL SC 573284106 6,364 43 0.68 2,449 -12.06 0.0051
2022-01-27 2021-12-31 13F MARTIN MARIETTA MATL SC 573284106 6,321 -637 -9.15 2,785 17.21 0.0056
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATL SC 573284106 6,958 929 15.41 2,376 12.08 0.0051
2021-08-06 2021-06-30 13F MARTIN MARIETTA MATL SC 573284106 6,029 -120 -1.95 2,120 2.71 0.0046
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATL SC 573284106 6,149 -1,228 -16.65 2,064 -1.48 0.0049
2021-02-09 2020-12-31 13F MARTIN MARIETTA MATL SC 573284106 7,377 -194 -2.56 2,095 17.56 0.0055
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATL SC 573284106 7,571 -18 -0.24 1,782 13.72 0.0053
2020-08-05 2020-06-30 13F MARTIN MARIETTA MATL SC 573284106 7,589 -60 -0.78 1,567 8.22 0.0049
2020-04-30 2020-03-31 13F MARTIN MARIETTA MATL SC 573284106 7,649 18 0.24 1,448 -32.15 0.0058
2020-02-04 2019-12-31 13F MARTIN MARIETTA MATL SC 573284106 7,631 -1,317 -14.72 2,134 -12.97 0.0069
2019-11-07 2019-09-30 13F MARTIN MARIETTA MATL SC 573284106 8,948 -1,801 -16.76 2,452 -0.89 0.0088
2019-07-19 2019-06-30 13F MARTIN MARIETTA MATL SC 573284106 10,749 -470 -4.19 2,474 9.61 0.0083
2019-05-13 2019-03-31 13F MARTIN MARIETTA MATL SC 573284106 11,219 -296 -2.57 2,257 14.05 0.0087
2019-05-21 2018-12-31 13F/A-1 MARTIN MARIETTA MATL SC 573284106 11,515 2,082 22.07 1,979 15.33 0.0086
2019-02-12 2018-12-31 13F MARTIN MARIETTA MATL SC 573284106 11,515 2,082 1,979 0.0086
2018-11-06 2018-09-30 13F MARTIN MARIETTA MATL SC 573284106 9,433 1,920 25.56 1,716 2.33 0.0064
2018-07-25 2018-06-30 13F MARTIN MARIETTA MATL SC 573284106 7,513 594 8.59 1,677 16.95 0.0065
2018-05-10 2018-03-31 13F MARTIN MARIETTA MATL SC 573284106 6,919 778 12.67 1,434 5.67 0.0056
2018-01-30 2017-12-31 13F MARTIN MARIETTA MATL SC 573284106 6,141 1,180 23.79 1,357 32.65 0.0053
2017-11-03 2017-09-30 13F MARTIN MARIETTA MATL SC 573284106 4,961 4,938 21,469.57 1,023 20,360.00 0.0041
2017-07-27 2017-06-30 13F MARTIN MARIETTA MATL SC 573284106 23 0 0.00 5 0.00 0.0000
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATL SC 573284106 23 0 0.00 5 0.00 0.0000
2017-02-07 2016-12-31 13F MARTIN MARIETTA MATL SC 573284106 23 0 0.00 5 25.00 0.0000
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATL SC 573284106 23 -677 -96.71 4 -97.01 0.0000
2016-08-11 2016-06-30 13F MARTIN MARIETTA MATL SC 573284106 700 700 -20.45 134 18.58 0.0007
2016-05-11 2016-03-31 13F MARTIN MARIETTA MATL SC 573284106 0 0 0 0.0000
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATL SC 573284106 0 -26 -100.00 0 -100.00
2015-11-16 2015-09-30 13F MARTIN MARIETTA MATL SC 573284106 26 26 0.00 4 0.0000
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATL SC 573284106 0 -692 -100.00 0 -100.00
2015-06-18 2015-03-31 13F/A-1 MARTIN MARIETTA MATL SC 573284106 692 -188 -21.36 97 0.00 0.0005
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATL SC 573284106 692 97
2015-02-17 2014-12-31 13F MARTIN MARIETTA MATL SC 573284106 880 0 0.00 97 -14.16 0.0005
2014-12-11 2014-09-30 13F/A-1 MARTIN MARIETTA MATL SC 573284106 880 692 368.09 113 352.00 0.0006
2014-11-13 2014-09-30 13F MARTIN MARIETTA MATL SC 573284106 880 692 113 0.0007
2014-08-13 2014-06-30 13F MARTIN MARIETTA MATL SC 573284106 188 0 0.00 25 4.17 0.0002
2014-05-14 2014-03-31 13F MARTIN MARIETTA MATL SC 573284106 188 188 526.67 24 700.00 0.0002
2013-11-08 2013-09-30 13F MARTIN MARIETTA MATL SC 573284106 0 -30 -100.00 0 -100.00
2013-08-14 2013-06-30 13F MARTIN MARIETTA MATL SC 573284106 30 30 3 0.0000
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.