Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionMontag A & Associates Inc
Latest Disclosed Ownership3,069 shares
Latest Disclosed Value $ 1,806,768
Montag A & Associates Inc reports 0.95% increase in ownership of MLM / Martin Marietta Materials, Inc.

On April 29, 2026 - Montag A & Associates Inc filed a 13F-HR form disclosing ownership of 3,069 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,806,768 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 3,040 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.95% 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)
2026-04-29 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,069 29 0.95 1,807 -4.60 0.0839
2026-02-02 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,040 -1,693 -35.77 1,893 -36.54 0.0864
2025-11-12 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,733 -30 -0.63 2,983 14.12 0.1372
2025-08-07 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,763 -50 -1.04 2,615 13.60 0.1274
2025-05-05 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,813 -119 -2.41 2,301 -9.66 0.1151
2025-01-30 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,932 -25 -0.50 2,547 -4.54 0.1209
2024-11-05 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,957 -4 -0.08 2,668 -0.71 0.1260
2024-07-31 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,961 -2,171 -30.44 2,688 -38.62 0.1356
2024-05-07 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,132 -49 -0.68 4,378 22.22 0.2189
2024-02-07 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,181 -1,222 -14.54 3,583 3.86 0.1998
2023-11-09 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,403 2,175 34.92 3,449 19.97 0.2177
2023-08-09 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,228 1,320 26.89 2,875 65.04 0.1771
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,908 75 1.55 1,743 6.67 0.1139
2023-02-02 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,833 17 0.35 1,633 5.29 0.1094
2022-11-09 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,816 -433 -8.25 1,551 -1.27 0.1074
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,249 -3,287 -38.51 1,571 -52.18 0.1016
2022-05-02 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,536 -11,219 -56.79 3,285 -62.25 0.1744
2022-02-09 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 19,755 -579 -2.85 8,702 25.24 0.4291
2021-11-08 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 20,334 -101 -0.49 6,948 -3.35 0.3731
2021-08-03 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 20,435 -2,169 -9.60 7,189 -5.30 0.3818
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 22,604 9,373 70.84 7,591 102.05 0.4274
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 13,231 10,107 323.53 3,757 411.16 0.2308
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,124 -409 -11.58 735 0.68 0.0593
2020-08-04 2020-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,533 -315 -8.19 730 0.27 0.0639
2020-05-06 2020-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 3,848 -515 -11.80 728 -40.33 0.0726
2020-02-05 2019-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 4,363 -752 -14.70 1,220 -12.98 0.0975
2019-11-04 2019-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 5,115 1,695 49.56 1,402 78.14 0.1220
2019-08-06 2019-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,420 0 0.00 787 14.39 0.0702
2019-05-01 2019-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 3,420 0 0.00 688 17.01 0.0638
2019-02-06 2018-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 3,420 -460 -11.86 588 -16.71 0.0632
2018-11-07 2018-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,880 -2,823 -42.12 706 -52.84 0.0619
2018-08-08 2018-06-30 13F/A-1 MARTIN MARIETTA MATERIALS COM 573284106 6,703 2,329 53.25 1,497 65.05 0.1537
2018-08-01 2018-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 6,703 2,329 1,497
2018-05-07 2018-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 4,374 -6,214 -58.69 907 -61.24 0.0934
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 10,588 5,299 100.19 2,340 114.48 0.2263
2017-11-06 2017-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 5,289 -1,091 -17.10 1,091 -23.17 0.1171
2017-08-04 2017-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 6,380 -300 -4.49 1,420 -2.61 0.1591
2017-05-02 2017-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 6,680 2,000 42.74 1,458 40.60 0.1630
2017-02-03 2016-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 4,680 -100 -2.09 1,037 21.14 0.1227
2016-11-07 2016-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 4,780 -275 -5.44 856 -11.84 0.1089
2016-08-02 2016-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 5,055 3,025 149.01 971 199.69 0.1282
2016-05-05 2016-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 2,030 0 0.00 324 16.97 0.0456
2016-02-11 2015-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 2,030 -2,500 -55.19 277 -59.74 0.0406
2015-11-06 2015-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 4,530 -400 -8.11 688 -1.43 0.1076
2015-08-17 2015-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 4,930 -10,880 -68.82 698 -68.42 0.1016
2015-05-12 2015-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,810 15,810 0.00 2,210 0.3197
2015-02-04 2014-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 0 -13,815 -100.00 0 -100.00
2014-11-04 2014-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 13,815 -20,900 -60.20 1,781 -61.15 0.2938
2014-08-06 2014-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 34,715 4,030 13.13 4,584 16.40 0.7473
2014-05-06 2014-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 30,685 30,685 3,938 0.6656
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.