Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionGreat Lakes Advisors, Llc
Latest Disclosed Ownership217,206 shares
Latest Disclosed Value $ 127,866,521
Great Lakes Advisors, Llc reports 18.63% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 11, 2026 - Great Lakes Advisors, Llc filed a 13F-HR form disclosing ownership of 217,206 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $127,866,521 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 183,100 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 18.63% 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)
2026-05-11 2026-03-31 13F MARTIN MARIETTA MATERIALS COM 573284106 217,206 34,106 18.63 127,867 12.15 0.3109
2026-02-12 2025-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 183,100 -1,360 -0.74 114,011 -1.94 0.9296
2025-11-03 2025-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 184,460 -471 -0.25 116,264 14.52 0.9705
2025-08-11 2025-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 184,931 778 0.42 101,522 14.75 0.8508
2025-05-16 2025-03-31 13F Martin Marietta Materials COM 573284106 184,153 11,678 6.77 88,472 -0.69 0.7914
2025-02-10 2024-12-31 13F MARTIN MARIETTA MATERIALS COM 573284106 172,475 28,005 19.38 89,083 14.56 0.7619
2024-11-04 2024-09-30 13F MARTIN MARIETTA MATERIALS COM 573284106 144,470 -16 -0.01 77,761 -0.67 0.6511
2024-08-06 2024-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 144,486 -3,381 -2.29 78,283 -13.77 0.6946
2024-05-08 2024-03-31 13F Martin Marietta Materials COM 573284106 147,867 395 0.27 90,781 23.39 0.7699
2024-02-08 2023-12-31 13F MARTIN MARIETTA MATERIALS CS 573284106 147,472 -111,567 -43.07 73,575 -30.81 0.7010
2023-11-07 2023-09-30 13F Martin Marietta Materials COM 573284106 259,039 58,924 29.45 106,330 15.09 0.9683
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 200,115 -25,908 -11.46 92,391 15.13 0.9231
2023-05-10 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 226,023 226,023 80,252 0.7291
2020-08-06 2020-06-30 13F Martin Marietta Materials COM 573284106 0 -9,332 -100.00 0 -100.00
2020-05-08 2020-03-31 13F Martin Marietta Materials COM 573284106 9,332 -951 -9.25 1,766 -38.60 0.0516
2020-02-07 2019-12-31 13F Martin Marietta Materials COM 573284106 10,283 -6,176 -37.52 2,876 -36.26 0.0617
2019-11-06 2019-09-30 13F Martin Marietta Materials COM 573284106 16,459 3,848 30.51 4,512 55.48 0.0991
2019-08-05 2019-06-30 13F Martin Marietta Materials COM 573284106 12,611 -9,799 -43.73 2,902 -35.63 0.0632
2019-05-07 2019-03-31 13F Martin Marietta Materials COM 573284106 22,410 22,410 4,508 0.1003
2018-02-07 2017-12-31 13F MARTIN MARIETTA MATLS CS 573284106 0 -1,516 -100.00 0 -100.00
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS CS 573284106 1,516 -18 -1.17 313 -8.21 0.0074
2017-08-07 2017-06-30 13F MARTIN MARIETTA MATLS CS 573284106 1,534 3 0.20 341 2.10 0.0084
2017-05-09 2017-03-31 13F MARTIN MARIETTA MATLS CS 573284106 1,531 -141 -8.43 334 -9.73 0.0086
2017-02-10 2016-12-31 13F MARTIN MARIETTA MATLS CS 573284106 1,672 -10,855 -86.65 370 -83.51 0.0097
2016-11-07 2016-09-30 13F MARTIN MARIETTA MATLS CS 573284106 12,527 1,536 13.98 2,244 6.35 0.0609
2016-08-12 2016-06-30 13F MARTIN MARIETTA MATLS CS 573284106 10,991 10,991 2,110 0.0574
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.