Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionUbs Asset Management Americas Inc
Latest Disclosed Ownership339,818 shares
Latest Disclosed Value $ 200,044,058
Ubs Asset Management Americas Inc reports 14.26% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - Ubs Asset Management Americas Inc filed a 13F-HR form disclosing ownership of 339,818 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $200,044,058 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 297,401 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 14.26% 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)
2026-05-13 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 339,818 42,417 14.26 200,044 8.03 0.0062
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 297,401 1,326 0.45 185,180 -0.77 0.0392
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 296,075 -81,820 -21.65 186,610 -10.05 0.0405
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 377,895 84,384 28.75 207,449 47.82 0.0420
2025-05-19 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 293,511 -22,390 -7.09 140,336 -13.99 0.0359
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 315,901 36,040 12.88 163,163 8.32 0.0381
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 279,861 7,752 2.85 150,635 2.18 0.0387
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATERIALS COM 573284106 272,109 73,772 37.20 147,429 21.07 0.0423
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 198,337 -11,306 -5.39 121,767 16.42 0.0433
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 209,643 5,319 2.60 104,593 24.71 0.0411
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 204,324 -53,530 -20.76 83,871 -8.39 0.0376
2023-08-11 2023-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 257,854 0 0.00 91,554 0.00 0.0443
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 257,854 -5,671 -2.15 91,554 2.80 0.0443
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 263,525 15,054 6.06 89,064 11.29 0.0467
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 248,471 -24,942 -9.12 80,030 -2.18 0.0449
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 273,413 -6,083 -2.18 81,816 -23.95 0.0429
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 279,496 -14,967 -5.08 107,575 -17.07 0.0461
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 294,463 -17,839 -5.71 129,717 21.56 0.0497
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 312,302 -3,027 -0.96 106,707 -3.81 0.0442
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 315,329 -9,171 -2.83 110,936 1.80 0.0475
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 324,500 10,417 3.32 108,974 22.18 0.0482
2021-03-01 2020-12-31 13F/A-1 MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 314,083 122,432 63.88 89,190 97.73 0.0418
2021-02-17 2020-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 191,651 0 45,107 4.2544
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 191,651 -350 -0.18 45,107 13.73 0.0242
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 192,001 -8,488 -4.23 39,662 4.54 0.0242
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 200,489 5,668 2.91 37,939 -30.36 0.0273
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 194,821 -3,946 -1.99 54,480 -0.01 0.0334
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 198,767 -3,157 -1.56 54,482 17.26 0.0367
2019-08-15 2019-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 201,924 -4,196 -2.04 46,465 12.05 0.0331
2019-05-14 2019-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 206,120 816 0.40 41,467 17.52 0.0308
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 205,304 -678 -0.33 35,286 -5.85 0.0304
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 205,982 -963 -0.47 37,478 -18.91 0.0279
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 206,945 -1,964 -0.94 46,217 6.72 0.0354
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 208,909 26,394 14.46 43,307 7.34 0.0342
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 182,515 4,884 2.75 40,343 10.13 0.0342
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 177,631 4,970 2.88 36,633 -4.68 0.0334
2017-08-11 2017-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 172,661 11,709 7.27 38,431 9.40 0.0372
2017-05-04 2017-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 160,952 -10,798 -6.29 35,128 -7.68 0.0358
2017-03-09 2016-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 171,750 -2,999 -1.72 38,048 21.56 0.0427
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 171,750 38,048
2016-11-04 2016-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 174,749 2,036 1.18 31,300 -5.61 0.0337
2016-11-29 2016-06-30 13F/A-1 MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 172,713 1,909 1.12 33,160 21.71 0.0375
2016-08-09 2016-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 172,713 33,160
2016-05-12 2016-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 170,804 -3,724 -2.13 27,246 14.31 0.0316
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 174,528 -24,475 -12.30 23,836 -21.17 0.0272
2015-10-29 2015-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 199,003 -4,686 -2.30 30,239 4.91 0.0334
2015-08-12 2015-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 203,689 -7,999 -3.78 28,824 -2.60 0.0276
2015-05-04 2015-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 211,688 211,688 0.00 29,593 0.0285
2015-02-02 2014-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 0 -392,187 -100.00 0 -100.00
2014-10-28 2014-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 392,187 10,639 2.79 50,568 0.36 0.0501
2014-08-13 2014-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 381,548 -126,018 -24.83 50,385 -22.66 0.0509
2014-05-23 2014-03-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 507,566 -241,748 -32.26 65,146 -13.01 0.0695
2014-01-31 2013-12-31 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 749,314 655,105 695.37 74,886 709.75 0.0856
2013-11-08 2013-09-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 94,209 -930 -0.98 9,248 -1.23 0.0114
2013-08-15 2013-06-30 13F/A-1 MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 95,139 95,139 9,363 0.0121
2013-08-13 2013-06-30 13F MARTIN MARIETTA MATERIALS EQUITY US CM 573284106 95,139 9,363 0.0123
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.