Martin Marietta Materials, Inc.
DE ˙ DB ˙ US5732841060
499,80 € ↑4,40 (0,89%)
2026-06-04
DEL PRIS
SecurityDE:MMX / Martin Marietta Materials, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership56,174 shares
Latest Disclosed Value $ 33,071,640
Janus Henderson Group Plc reports 0.80% decrease in ownership of MMX / Martin Marietta Materials, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 56,174 shares of Martin Marietta Materials, Inc. (DE:MMX) valued at $28,221,818 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 56,626 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.80% during the quarter. The current value of the position is $28,075,765 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)
2026-05-18 2026-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 56,174 -452 -0.80 33,072 -6.21 0.0056
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 56,174 -452 33,072 0.0061
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 56,626 526 0.94 35,260 -0.27 0.0158
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 56,100 -699 -1.23 35,357 13.40 0.0161
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 56,799 -270 -0.47 31,179 14.31 0.0153
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 57,069 36 0.06 27,277 -7.40 0.0150
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 57,033 -7,485 -11.60 29,457 -15.17 0.0150
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 64,518 0 0.00 34,726 -0.66 0.0178
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 64,518 -1,507 -2.28 34,955 -13.76 0.0187
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 66,025 -14,882 -18.39 40,530 0.41 0.0221
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 80,907 -907 -1.11 40,366 20.20 0.0241
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 81,814 -5,847 -6.67 33,583 -17.01 0.0220
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 87,661 -5,326 -5.73 40,469 22.58 0.0252
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 92,987 -9,868 -9.59 33,014 -5.02 0.0218
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 102,855 20,954 25.58 34,760 31.76 0.0248
2023-01-13 2022-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 81,901 7,814 10.55 26,381 18.99 0.0198
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 81,901 7,814 26,381 0.0197
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 74,087 -75,007 -50.31 22,170 -61.37 0.0153
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 149,094 -44,191 -22.86 57,387 -32.60 0.0277
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 193,285 65,497 51.25 85,145 95.01 0.0355
2021-11-16 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 127,788 10,030 8.52 43,662 5.39 0.0191
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 117,758 -21,829 -15.64 41,430 -11.62 0.0177
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 139,587 -42,952 -23.53 46,878 -9.57 0.0214
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 182,539 -39,710 -17.87 51,837 -0.90 0.0241
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 222,249 119,193 115.66 52,309 145.72 0.0273
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 103,056 -191,822 -65.05 21,288 -61.85 0.0119
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 294,878 144,505 96.10 55,800 32.70 0.0384
2020-02-18 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 150,373 96,918 181.31 42,050 186.97 0.0215
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 53,455 15,243 39.89 14,653 66.62 0.0079
2019-07-31 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 38,212 12,347 47.74 8,794 69.02 0.0048
2019-04-30 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 25,865 10,993 73.92 5,203 103.56 0.0029
2019-02-06 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,872 -2,944 -16.52 2,556 -21.16 0.0016
2018-11-09 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,816 63 0.35 3,242 -18.23 0.0017
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,753 -6,391 -26.47 3,965 -20.78 0.0023
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 24,144 -4,787 -16.55 5,005 -21.74 0.0029
2018-03-12 2017-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 28,931 -134,870 -82.34 6,395 -81.07 0.0039
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 28,931 -134,870 6,395
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 163,801 -61,364 -27.25 33,781 -32.60 0.0217
2017-08-17 2017-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 225,165 217,072 2,682.22 50,117 2,736.28 0.0342
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 225,165 217,072 50,117
2017-05-03 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,093 0 0.00 1,767 -1.45 0.0124
2017-01-30 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,093 951 13.32 1,793 40.19 0.0132
2016-10-24 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,142 0 0.00 1,279 -6.71 0.0094
2016-07-29 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,142 0 0.00 1,371 20.37 0.0114
2016-05-12 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,142 0 0.00 1,139 16.82 0.0092
2016-02-03 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,142 0 0.00 975 -10.14 0.0078
2015-11-16 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,142 3,192 80.81 1,085 94.10 0.0096
2015-08-17 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,950 0 0.00 559 1.27 0.0044
2015-06-02 2015-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 3,950 0 0.00 552 26.61 0.0043
2015-05-15 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,950 552
2015-02-12 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,950 0 0.00 436 -14.34 0.0031
2014-11-12 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,950 0 0.00 509 -2.49 0.0048
2014-08-13 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,950 0 0.00 522 2.96 0.0049
2014-05-08 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,950 1,000 33.90 507 71.86 0.0049
2014-01-14 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,950 0 0.00 295 1.72 0.0030
2013-11-12 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,950 0 0.00 290 -1.69 0.0032
2013-08-15 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,950 2,950 295 0.0034
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.