Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership11,068 shares
Latest Disclosed Value $ 6,516
Amalgamated Bank reports 1.86% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 11,068 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $6,515,510 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 11,278 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -1.86% during the quarter. The current value of the position is $6,454,304 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)
2026-05-08 2026-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 11,068 -210 -1.86 7 -14.29 0.0499
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 11,278 -201 -1.75 7 0.00 0.0507
2025-10-29 2025-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 11,479 -195 -1.67 7 16.67 0.0517
2025-08-04 2025-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 11,674 -530 -4.34 6 20.00 0.0495
2025-04-25 2025-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 12,204 154 1.28 6 -16.67 0.0499
2025-02-04 2024-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 12,050 -575 -4.55 6 0.00 0.0511
2024-10-30 2024-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 12,625 139 1.11 7 0.00 0.0560
2024-08-12 2024-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 12,486 -419 -3.25 7 -14.29 0.0576
2024-04-23 2024-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 12,905 -2,954 -18.63 8 0.00 0.0678
2024-02-06 2023-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,859 -601 -3.65 8 16.67 0.0631
2023-11-08 2023-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 16,460 397 2.47 7 -14.29 0.0575
2023-08-11 2023-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 16,063 -107 -0.66 7 40.00 0.0600
2023-05-02 2023-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 16,170 48 0.30 6 0.00 0.0489
2023-02-10 2022-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 16,122 239 1.50 5 -99.90 0.0486
2022-11-09 2022-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 15,883 -575 -3.49 5,116 3.88 0.0494
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 16,458 795 5.08 4,925 -18.31 0.0459
2022-08-25 2022-03-31 13F/A-1 MARTIN MARIETTA MATERIALS COM 573284106 15,663 -1,135 -6.76 6,029 -18.53 0.0468
2022-06-30 2022-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 15,663 -1,135 6,029 0.0479
2022-02-15 2021-12-31 13F/A-1 MARTIN MARIETTA MATERIALS COM 573284106 16,798 -1,736 -9.37 7,400 16.85 0.0546
2022-02-15 2021-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 16,798 -1,736 7,400 0.0546
2021-10-29 2021-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 18,534 -617 -3.22 6,333 -6.01 0.0535
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 19,151 15,755 463.93 6,738 491.05 0.0540
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 3,396 -125 -3.55 1,140 14.00 0.0427
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 3,521 -5 -0.14 1,000 20.48 0.0379
2020-10-30 2020-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,526 -68 -1.89 830 11.86 0.0361
2020-08-10 2020-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 3,594 -5,942 -62.31 742 -58.87 0.0343
2020-05-13 2020-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 9,536 -346 -3.50 1,804 -34.71 0.0441
2020-02-13 2019-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 9,882 588 6.33 2,763 8.48 0.0508
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 9,294 555 6.35 2,547 26.65 0.0536
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 8,739 -572 -6.14 2,011 7.37 0.0469
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 9,311 201 2.21 1,873 19.60 0.0454
2019-02-15 2018-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 9,110 -259 -2.76 1,566 -8.15 0.0444
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 9,369 -284 -2.94 1,705 -20.92 0.0422
2018-07-18 2018-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 9,653 592 6.53 2,156 14.80 0.0527
2018-05-22 2018-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 9,061 812 9.84 1,878 3.02 0.0498
2018-02-13 2017-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 8,249 721 9.58 1,823 17.46 0.0493
2017-11-09 2017-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 7,528 154 2.09 1,552 -5.42 0.0483
2017-08-10 2017-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 7,374 2,600 54.46 1,641 57.49 0.0538
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 4,774 -1,844 -27.86 1,042 -28.92 0.0519
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 6,618 1,195 22.04 1,466 50.98 0.0663
2016-11-15 2016-09-30 13F/A-1 MARTIN MARIETTA MATERIALS COM 573284106 5,423 4 0.07 971 -9.76 0.0563
2016-11-14 2016-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 1,629 292
2016-08-16 2016-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 5,419 -2,877 -34.68 1,076 -18.67 0.0623
2016-05-11 2016-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 8,296 677 8.89 1,323 27.09 0.1289
2016-02-10 2015-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 7,619 -512 -6.30 1,041 -15.78 0.1284
2015-11-04 2015-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 8,131 155 1.94 1,236 9.48 0.1297
2015-07-10 2015-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 7,976 601 8.15 1,129 9.51 0.1109
2015-04-22 2015-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 7,375 7,375 0.00 1,031 0.1259
2015-01-29 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -7,123 -100.00 0 -100.00
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,123 1,942 37.48 918 34.21 0.1366
2014-08-11 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,181 -211 -3.91 684 -1.16 0.1032
2014-05-12 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,392 -39 -0.72 692 27.44 0.1192
2014-02-13 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,431 5,431 543 0.0923
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.