Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionAssenagon Asset Management S.A.
Latest Disclosed Ownership23,501 shares
Latest Disclosed Value $ 13,834,569
Assenagon Asset Management S.A. reports 29.15% increase in ownership of MLM / Martin Marietta Materials, Inc.

On April 20, 2026 - Assenagon Asset Management S.A. filed a 13F-HR form disclosing ownership of 23,501 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $13,834,569 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 18,197 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 29.15% 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)
2026-04-20 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 23,501 5,304 29.15 13,835 22.10 0.0210
2026-01-09 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 18,197 -12,336 -40.40 11,331 -41.12 0.0156
2025-10-07 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 30,533 5,797 23.44 19,244 41.72 0.0263
2025-07-11 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 24,736 22,287 910.04 13,579 1,060.60 0.0202
2025-04-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,449 -29,387 -92.31 1,171 -92.88 0.0020
2025-01-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 31,836 -43,209 -57.58 16,443 -59.29 0.0265
2024-10-23 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 75,045 65,454 682.45 40,393 677.37 0.0743
2024-07-18 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,591 2 0.02 5,196 -11.74 0.0116
2024-04-24 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,589 -46,172 -82.80 5,887 -78.84 0.0139
2024-01-17 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 55,761 47,257 555.70 27,820 697.11 0.0738
2023-11-06 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,504 -236 -2.70 3,491 -13.51 0.0108
2023-07-25 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,740 6,974 394.90 4,035 543.54 0.0140
2023-04-18 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,766 -9,816 -84.75 627 20,800.00 0.0022
2023-01-12 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,582 -84,342 -87.93 4 -99.99 0.0141
2022-10-27 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 95,924 -210,911 -68.74 30,896 -66.35 0.1186
2022-07-27 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 306,835 6,930 2.31 91,817 -20.46 0.3403
2022-04-25 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 299,905 299,121 38,153.19 115,430 33,357.97 0.3207
2022-02-01 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 784 -4,316 -84.63 345 -80.21 0.0010
2021-10-19 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,100 5,100 1,743 0.0056
2021-07-15 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -30,903 -100.00 0 -100.00
2021-04-26 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 30,903 15,058 95.03 10,378 130.62 0.0421
2021-02-01 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 15,845 15,845 4,500 0.0196
2020-10-07 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -79,247 -100.00 0 -100.00
2020-07-21 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 79,247 56,372 246.43 16,370 278.15 0.1050
2020-04-17 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 22,875 16,931 284.84 4,329 160.47 0.0346
2020-01-17 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,944 -713 -10.71 1,662 -8.93 0.0105
2019-10-16 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,657 934 16.32 1,825 38.57 0.0122
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,723 -3,372 -37.08 1,317 -28.03 0.0099
2019-04-26 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,095 9,095 1,830 0.0172
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.