Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership2,093,942 shares
Latest Disclosed Value $ 1,232,684,031
Principal Financial Group Inc reports 3.54% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 2,093,942 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,232,684,031 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 2,170,746 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -3.54% 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)
2026-05-04 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,093,942 -76,804 -3.54 1,232,684 -8.80 0.6583
2026-02-02 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,170,746 -33,679 -1.53 1,351,661 -2.72 0.6901
2025-11-04 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,204,425 192,637 9.58 1,389,428 25.81 0.7008
2025-08-08 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,011,788 71,365 3.68 1,104,409 19.04 0.5838
2025-04-28 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,940,423 120,679 6.63 927,775 -1.29 0.5206
2025-01-31 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,819,744 191,043 11.73 939,898 7.21 0.5124
2024-10-31 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,628,701 704,460 76.22 876,648 75.07 0.4829
2024-07-29 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 924,241 -24,667 -2.60 500,754 -14.04 0.2974
2024-04-29 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 948,908 -10,144 -1.06 582,573 21.75 0.3424
2024-02-07 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 959,052 -2,593 -0.27 478,481 21.22 0.3051
2023-11-02 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 961,645 -17,090 -1.75 394,736 -12.64 0.2836
2023-08-07 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 978,735 1,096 0.11 451,873 30.18 0.3088
2023-05-09 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 977,639 -18,434 -1.85 347,121 3.11 0.2481
2023-02-09 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 996,073 -28,229 -2.76 336,643 2.04 0.2535
2022-11-09 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,024,302 -864 -0.08 329,917 7.55 0.2622
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,025,166 -29,172 -2.77 306,771 -24.40 0.2270
2022-05-09 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,054,338 -712 -0.07 405,804 -11.86 0.1611
2022-05-09 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,048,297 403,479
2022-02-09 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,055,050 -41,386 -3.77 460,417 22.90 0.2748
2021-11-09 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,096,436 -39,847 -3.51 374,630 -6.29 0.2443
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,136,283 -55,056 -4.62 399,756 -0.08 0.2583
2021-05-10 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,191,339 -129,545 -9.81 400,077 6.66 0.2823
2021-02-23 2020-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,320,884 -15,977 -1.20 375,092 19.21 0.2778
2021-02-08 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,449,811 112,950 411,703 161,970.3049
2020-11-06 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,336,861 -78,962 -5.58 314,644 7.58 0.2648
2020-08-05 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,415,823 -31,382 -2.17 292,466 6.80 0.2593
2020-05-12 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,447,205 -63,542 -4.21 273,855 -35.18 0.3031
2020-02-05 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,510,747 -177,631 -10.52 422,465 -8.71 0.3520
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,688,378 -4,662 -0.28 462,785 18.79 0.4081
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,693,040 -45,091 -2.59 389,585 11.41 0.3503
2019-05-10 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,738,131 -36,793 -2.07 349,677 14.63 0.3257
2019-02-14 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,774,924 -279,100 -13.59 305,056 -18.38 0.3251
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,054,024 -56,276 -2.67 373,730 -20.70 0.3294
2018-08-13 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,110,300 155,168 7.94 471,293 16.28 0.4332
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,955,132 45,493 2.38 405,300 -3.98 0.3895
2018-02-12 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,909,639 248,887 14.99 422,106 23.24 0.3886
2017-11-02 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,660,752 282,189 20.47 342,497 11.62 0.3321
2017-08-08 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,378,563 45,402 3.41 306,840 5.46 0.3075
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,333,161 238,711 21.81 290,962 20.01 0.3501
2017-02-13 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,094,450 136,263 14.22 242,454 41.27 0.3075
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 958,187 197,107 25.90 171,621 17.45 0.2267
2016-08-09 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 761,080 -4,627 -0.60 146,127 19.64 0.2038
2016-05-10 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 765,707 -523,534 -40.61 122,139 -30.64 0.1773
2016-02-09 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,289,241 -334,425 -20.60 176,084 -28.63 0.2616
2015-11-12 2015-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,623,666 -14,892 -0.91 246,715 6.40 0.3876
2015-11-09 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,623,666 246,715
2015-08-10 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,638,558 81,662 5.25 231,872 6.53 0.3458
2015-05-14 2015-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,556,896 104,017 7.16 217,653 35.79 0.3243
2015-05-12 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 146,404 20,467
2015-02-12 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,452,879 106,302 7.89 160,282 -7.69 0.2490
2014-11-13 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,346,577 89,796 7.14 173,628 4.62 0.2946
2014-08-12 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,256,781 99,375 8.59 165,958 11.72 0.2791
2014-05-13 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,157,406 39,369 3.52 148,552 32.95 0.2650
2014-02-12 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,118,037 119,791 12.00 111,736 14.02 0.2085
2013-11-05 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 998,246 258,761 34.99 97,997 34.65 0.2024
2013-08-12 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 739,485 739,485 72,780 0.1612
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.