Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership82,360 shares
Latest Disclosed Value $ 48,483,685
Bnp Paribas Arbitrage, Sa reports 30.05% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 82,360 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $48,483,685 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 117,749 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -30.05% 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)
2026-05-12 2026-03-31 13F Martin Marietta Materials Equity 573284106 82,360 -35,389 -30.05 48,484 -33.87 0.0024
2026-02-10 2025-12-31 13F Martin Marietta Materials Equity 573284106 117,749 -123 -0.10 73,318 -1.31 0.0332
2025-11-13 2025-09-30 13F Martin Marietta Materials Equity 573284106 117,872 69,016 141.26 74,292 177.01 0.0397
2025-08-14 2025-06-30 13F Martin Marietta Materials Equity 573284106 48,856 -26,340 -35.03 26,820 -25.41 0.0154
2025-05-14 2025-03-31 13F Martin Marietta Materials Equity 573284106 75,196 -58,770 -43.87 35,953 -48.04 0.0211
2025-02-14 2024-12-31 13F Martin Marietta Materials Equity 573284106 133,966 62,687 87.95 69,193 80.35 0.0388
2024-11-13 2024-09-30 13F Martin Marietta Materials Equity 573284106 71,279 47 0.07 38,366 -0.59 0.0258
2024-08-13 2024-06-30 13F Martin Marietta Materials Equity 573284106 71,232 -1,903 -2.60 38,593 -14.05 0.0314
2024-05-01 2024-03-31 13F Martin Marietta Materials Equity 573284106 73,135 47,250 182.54 44,901 247.68 0.0394
2024-02-14 2023-12-31 13F/A-2 Martin Marietta Materials Equity 573284106 25,885 -7,683 -22.89 12,914 -6.27 0.0147
2024-02-07 2023-12-31 13F/A-1 Martin Marietta Materials Equity 573284106 25,885 -7,683 12,914 0.0018
2024-02-07 2023-12-31 13F Martin Marietta Materials Equity 573284106 25,885 -7,683 12,914 0.0150
2023-11-14 2023-09-30 13F Martin Marietta Materials Equity 573284106 33,568 -3,384 -9.16 13,779 -19.24 0.0177
2023-08-09 2023-06-30 13F Martin Marietta Materials Equity 573284106 36,952 -66,659 -64.34 17,060 -53.63 0.0213
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 103,611 36,672 54.78 36,788 62.61 0.0515
2023-02-14 2022-12-31 13F Martin Marietta Materials Equity 573284106 66,939 44,688 200.84 22,623 215.70 0.0348
2022-11-16 2022-09-30 13F/A-1 Martin Marietta Materials Equity 573284106 22,251 -4,757 -17.61 7,167 -11.32 0.0115
2022-11-15 2022-09-30 13F Martin Marietta Materials Equity 573284106 22,251 -4,757 7,167 0.0017
2022-08-12 2022-06-30 13F Martin Marietta Materials Equity 573284106 27,008 9,099 50.81 8,082 17.25 0.0126
2022-05-18 2022-03-31 13F/A-1 Martin Marietta Materials Equity 573284106 17,909 5,214 41.07 6,893 23.25 0.0093
2022-02-09 2021-12-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 12,695 -24,148 -65.54 5,592 -55.58 0.0080
2021-11-16 2021-09-30 13F/A-1 MARTIN MARIETTA MATERIALS EQUITY 573284106 36,843 13,903 60.61 12,589 55.99 0.0178
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 37,370 14,430 8,795 0.0000
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 22,940 1,301 6.01 8,071 11.07 0.0107
2021-05-07 2021-03-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 21,639 -23,372 -51.93 7,267 -43.15 0.0106
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 45,011 7,641 20.45 12,782 45.32 0.0238
2020-10-30 2020-09-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 37,370 21,560 136.37 8,795 169.37 0.0126
2020-08-06 2020-06-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 15,810 -35,507 -69.19 3,266 -66.37 0.0058
2020-05-13 2020-03-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 51,317 591 1.17 9,711 -31.55 0.0199
2020-02-12 2019-12-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 50,726 -10,730 -17.46 14,185 -15.79 0.0258
2019-11-07 2019-09-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 61,456 42,495 224.12 16,845 286.09 0.0299
2019-07-30 2019-06-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 18,961 -3,232 -14.56 4,363 -2.26 0.0087
2019-04-25 2019-03-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 22,193 5,425 32.35 4,465 54.95 0.0097
2019-02-12 2018-12-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 16,768 -13,606 -44.79 2,882 -47.86 0.0068
2018-11-07 2018-09-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 30,374 9,523 45.67 5,527 18.69 0.0082
2018-07-25 2018-06-30 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 20,851 2,293 12.36 4,657 21.03 0.0078
2018-05-11 2018-03-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 18,558 7,141 62.55 3,847 52.48 0.0072
2018-03-05 2017-12-31 13F/A-1 MARTIN MARIETTA MATERIALS EQUITY 573284106 11,417 -27,684 -70.80 2,524 -68.71 0.0045
2018-02-01 2017-12-31 13F MARTIN MARIETTA MATERIALS EQUITY 573284106 11,417 -27,684 2,524
2017-11-03 2017-09-30 13F MARTIN MARIETTA MATLS STOCK 573284106 39,101 4,060 11.59 8,064 3.39 0.0197
2017-08-03 2017-06-30 13F MARTIN MARIETTA MATLS STOCK 573284106 35,041 -12,314 -26.00 7,799 -24.54 0.0235
2017-05-03 2017-03-31 13F MARTIN MARIETTA MATLS STOCK 573284106 47,355 41,725 741.12 10,335 728.79 0.0273
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS STOCK 573284106 5,630 -2,768 -32.96 1,247 -17.09 0.0058
2016-10-05 2016-09-30 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 8,398 -6,249 -42.66 1,504 -46.51 0.0062
2016-07-06 2016-06-30 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 14,647 4,925 50.66 2,812 81.42 0.0127
2016-04-22 2016-03-31 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 9,722 7,872 425.51 1,551 515.08 0.0066
2016-04-19 2015-12-31 13F/A-1 * MARTIN MARIETTA MATLS INC COM STOCK 573284106 1,850 1,684 1,014.46 253 908.00 0.0012
2016-02-10 2015-12-31 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 1,842 252
2015-11-13 2015-09-30 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 166 -3,238 -95.12 25 -94.80 0.0001
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATLS INC COM STOCK 573284106 3,404 -5,678 -62.52 482 -62.10 0.0013
2015-05-15 2015-03-31 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 9,082 -15,185 -62.57 1,270 -52.60 0.0035
2015-03-10 2014-12-31 13F/A-1 * MARTIN MARIETTA MATLS INC COM STOCK 573284106 24,267 -176 -0.72 2,677 -15.04 0.0095
2015-02-11 2014-12-31 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 24,267 2,677
2014-11-12 2014-09-30 13F * MARTIN MARIETTA MATLS INC COM STOCK 573284106 24,443 21,272 670.83 3,152 653.83 0.0027
2014-08-14 2014-06-30 13F/A-1 * MARTIN MARIETTA MATLS INC COM STOCK 573284106 3,171 -5,014 -61.26 419 -58.90 0.0004
2014-08-14 2014-06-30 13F MARTIN MARIETTA MATLS INC COM STOCK 573284106 3,171 419
2014-05-13 2014-03-31 13F MARTIN MARIETTA MATLS STOCK 573284106 8,185 2,364 40.61 1,018 75.04 0.0008
2014-04-02 2013-12-31 13F/A-1 MARTIN MARIETTA MATLS STOCK 573284106 5,821 -1,579 -21.34 582 -19.97 0.0004
2014-02-12 2013-12-31 13F MARTIN MARIETTA MATLS STOCK 573284106 5,821 582
2013-11-13 2013-09-30 13F MARTIN MARIETTA MATLS STOCK 573284106 7,400 -1,768 -19.28 726 -19.51 0.0005
2013-08-13 2013-06-30 13F MARTIN MARIETTA MATLS STOCK 573284106 9,168 9,168 902 0.0006
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.