Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership1,887 shares
Latest Disclosed Value $ 1,110,839
Guggenheim Capital Llc reports 5.42% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 1,887 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,110,839 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,790 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 5.42% 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,887 97 5.42 1,111 -0.36 0.0043
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,790 1 0.06 1,115 -1.15 0.0080
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,789 116 6.93 1,128 22.77 0.0082
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,673 -44 -2.56 918 11.95 0.0073
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,717 -191 -10.01 821 -16.75 0.0075
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,908 -2,365 -55.35 985 -57.16 0.0080
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,273 -213 -4.75 2,300 -5.39 0.0161
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,486 1,977 78.80 2,431 57.79 0.0172
2024-05-14 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,509 -327 -11.53 1,540 8.91 0.0109
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,836 32 1.14 1,415 22.96 0.0107
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,804 -1,051 -27.26 1,151 -35.36 0.0099
2023-08-11 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,855 -672 -14.84 1,780 10.70 0.0140
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,527 118 2.68 1,607 7.85 0.0135
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,409 -53 -1.19 1,490 3.69 0.0131
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,462 -533 -10.67 1,437 -3.82 0.0132
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,995 -3,048 -37.90 1,494 -51.74 0.0118
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,043 1,336 19.92 3,096 4.81 0.0186
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 6,707 283 4.41 2,954 34.58 0.0154
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,424 -1,379 -17.67 2,195 -20.07 0.0132
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,803 1,743 28.76 2,746 34.94 0.0162
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,060 -1,698 -21.89 2,035 -7.63 0.0134
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,758 -640 -7.62 2,203 11.49 0.0138
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,398 365 4.54 1,976 19.11 0.0143
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,033 446 5.88 1,659 15.53 0.0128
2020-06-02 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,587 -26,541 -77.77 1,436 -84.95 0.0145
2020-02-20 2019-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 34,128 26,689 358.77 9,543 368.25 0.0717
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 34,128 26,689 9,543 56,559.4534
2020-02-20 2019-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 7,439 -997 -11.82 2,038 5.00 0.0163
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,439 -997 2,038 14,935.0618
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,436 -387 -4.39 1,941 9.29 0.0158
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,823 -1,174 -11.74 1,776 3.32 0.0145
2019-02-14 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,997 -2,681 -21.15 1,719 -25.46 0.0146
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,678 2,131 20.20 2,306 -2.16 0.0150
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,547 -194,111 -94.85 2,357 -94.44 0.0157
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 204,658 6,626 3.35 42,425 -3.08 0.1035
2018-02-14 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 198,032 -53,620 -21.31 43,774 -15.65 0.1037
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 251,652 -29,761 -10.58 51,898 -17.14 0.1219
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 281,413 -18,209 -6.08 62,635 -4.22 0.1659
2017-05-15 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 299,622 14,626 5.13 65,392 3.57 0.1772
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 284,996 -7,898 -2.70 63,135 20.35 0.1806
2016-11-14 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 292,894 31,269 11.95 52,461 4.44 0.1632
2016-08-15 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 261,625 15,136 6.14 50,232 27.76 0.1578
2016-05-16 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 246,489 -53,339 -17.79 39,318 -3.99 0.1241
2016-02-16 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 299,828 28,168 10.37 40,951 -0.79 0.1192
2015-11-16 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 271,660 -202,356 -42.69 41,279 -38.46 0.1270
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 474,016 -22,490 -4.53 67,078 -3.36 0.1656
2015-05-18 2015-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 496,506 -202,875 -29.01 69,413 -10.04 0.1643
2015-05-15 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 496,506 69,413
2015-02-17 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 699,381 100,472 16.78 77,156 -0.09 0.1936
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 598,909 263,580 78.60 77,224 74.40 0.1863
2014-08-14 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 335,329 169,577 102.31 44,280 108.14 0.1120
2014-05-16 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 165,752 124,434 301.16 21,274 414.24 0.0605
2014-02-14 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 41,318 33,843 452.75 4,137 463.62 0.0126
2013-11-14 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,475 -48,188 -86.57 734 -86.60 0.0026
2013-08-22 2013-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 55,663 55,663 5,478 0.0230
2013-08-14 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 55,663 5,478 0.0231
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.