Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership2,237 shares
Latest Disclosed Value $ 1,316,878
Quadrant Capital Group Llc reports 2.33% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 2,237 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,316,878 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,186 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 2.33% 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)
2026-05-13 2026-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 2,237 51 2.33 1,317 -3.31 0.0394
2026-05-11 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,237 51 49 0.0369
2026-02-12 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,186 17 0.78 1,361 -0.44 0.0411
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,169 0 0.00 1,367 14.87 0.0444
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,169 135 6.64 1,191 22.43 0.0429
2025-05-13 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,034 1,115 121.33 973 105.06 0.0361
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 919 19 2.11 475 -2.07 0.0327
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 900 14 1.58 484 0.83 0.0337
2024-08-12 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 886 68 8.31 480 -4.38 0.0356
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 818 -311 -27.55 502 -10.83 0.0397
2024-02-08 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,129 121 12.00 563 36.32 0.0484
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,008 14 1.41 414 -9.83 0.0414
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 994 -1,015 -50.52 459 -35.76 0.0455
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,009 27 1.36 713 6.58 0.0743
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,982 30 1.54 670 6.36 0.0759
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,952 125 6.84 629 14.99 0.0832
2022-08-09 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,827 94 5.42 547 -17.99 0.0735
2022-05-06 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,733 1,608 1,286.40 667 1,112.73 0.0808
2022-02-01 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 125 33 35.87 55 77.42 0.0066
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 92 2 2.22 31 -3.12 0.0043
2021-08-09 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 90 -4 -4.26 32 0.00 0.0046
2021-05-12 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 94 -26 -21.67 32 -5.88 0.0052
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 120 76 172.73 34 240.00 0.0063
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 44 -67 -60.36 10 -56.52 0.0022
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 111 -663 -85.66 23 -84.46 0.0051
2020-05-15 2020-03-31 13F Martin Marietta Materials Com 573284106 774 537 226.58 148 131.25 0.0248
2020-03-19 2019-12-31 13F/A-1 Martin Marietta Materials Com 573284106 237 0 0.00 64 1.59 0.0077
2020-02-03 2019-12-31 13F Martin Marietta Materials Com 573284106 237 0 64 7,668.0409
2019-10-24 2019-09-30 13F Martin Marietta Materials COM 573284106 237 0 0.00 63 23.53 0.0097
2019-07-24 2019-06-30 13F Martin Marietta Materials COM 573284106 237 110 86.61 51 121.74 0.0081
2019-04-29 2019-03-31 13F Martin Marietta Materials COM 573284106 127 112 746.67 23 2,200.00 0.0040
2019-01-17 2018-12-31 13F Martin Marietta Materials COM 573284106 15 4 36.36 1 0.00 0.0003
2018-10-29 2018-09-30 13F Martin Marietta Materials COM 573284106 11 0 0.00 1 -50.00 0.0003
2018-08-08 2018-06-30 13F Martin Marietta Materials COM 573284106 11 0 0.00 2 0.00 0.0007
2018-05-10 2018-03-31 13F Martin Marietta Materials COM 573284106 11 -3 -21.43 2 0.00 0.0007
2018-01-31 2017-12-31 13F Martin Marietta Materials COM 573284106 14 0 0.00 2 0.00 0.0008
2017-10-13 2017-09-30 13F Martin Marietta Materials COM 573284106 14 -9 -39.13 2 -50.00 0.0008
2017-08-14 2017-06-30 13F Martin Marietta Materials COM 573284106 23 9 64.29 4 100.00 0.0018
2017-04-10 2017-03-31 13F Martin Marietta Materials COM 573284106 14 3 27.27 2 0.00 0.0009
2017-01-11 2016-12-31 13F Martin Marietta Materials COM 573284106 11 0 0.00 2 100.00 0.0010
2016-10-25 2016-09-30 13F Martin Marietta Materials COM 573284106 11 0 0.00 1 0.00 0.0007
2016-07-28 2016-06-30 13F Martin Marietta Materials COM 573284106 11 3 37.50 1 0.0007
2016-04-27 2016-03-31 13F Martin Marietta Materials COM 573284106 8 8 0.00 0 0.0000
2016-01-28 2015-12-31 13F Martin Marietta Materials COM 573284106 0 -5 -100.00 0 0.0000
2015-10-28 2015-09-30 13F Martin Marietta Materials COM 573284106 5 5 0 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.