Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionFindlay Park Partners LLP
Latest Disclosed Ownership194,302 shares
Latest Disclosed Value $ 114,381,701
Findlay Park Partners LLP reports 7.48% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - Findlay Park Partners LLP filed a 13F-HR form disclosing ownership of 194,302 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $114,381,701 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 180,782 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 7.48% 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 194,302 13,520 7.48 114,382 1.61 1.5944
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 180,782 -36,260 -16.71 112,566 -17.71 1.4363
2025-11-12 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 217,042 -3,800 -1.72 136,797 12.84 1.4370
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 220,842 -7,800 -3.41 121,233 10.90 1.2501
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 228,642 -54,200 -19.16 109,321 -25.17 1.1247
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 282,842 -101,000 -26.31 146,088 -29.29 1.4516
2024-11-04 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 383,842 -4,000 -1.03 206,603 -1.68 1.9482
2024-08-13 2024-06-30 13F Martin Marietta Matls COM 573284106 387,842 -3,000 -0.77 210,133 -12.43 1.9801
2024-04-30 2024-03-31 13F Martin Marietta Matls COM 573284106 390,842 -138,000 -26.09 239,954 -9.05 2.2017
2024-02-07 2023-12-31 13F Martin Marietta Matls COM 573284106 528,842 -13,888 -2.56 263,845 18.43 2.5917
2023-11-07 2023-09-30 13F Martin Marietta Matls COM 573284106 542,730 -130,954 -19.44 222,780 -28.37 2.3949
2023-08-07 2023-06-30 13F Martin Marietta Matls COM 573284106 673,684 -116,069 -14.70 311,033 10.92 3.1935
2023-05-05 2023-03-31 13F Martin Marietta Matls COM 573284106 789,753 79,263 11.16 280,410 16.78 2.9606
2023-02-10 2022-12-31 13F/A-1 Martin Marietta Matls COM 573284106 710,490 179,379 33.77 240,124 40.37 2.6134
2023-02-07 2022-12-31 13F Martin Marietta Matls COM 573284106 710,490 179,379 240 2.6133
2022-11-10 2022-09-30 13F Martin Marietta Matls COM 573284106 531,111 85,534 19.20 171,066 28.30 1.6939
2022-08-18 2022-06-30 13F/A-1 Martin Marietta Matls COM 573284106 445,577 -2,142 -0.48 133,334 -22.63 1.2435
2022-08-09 2022-06-30 13F Martin Marietta Matls COM 573284106 445,577 -2,142 133,334 1.2435
2022-05-12 2022-03-31 13F Martin Marietta Matls COM 573284106 447,719 0 0.00 172,323 -12.63 1.3013
2022-02-10 2021-12-31 13F Martin Marietta Matls COM 573284106 447,719 0 0.00 197,229 28.93 1.3174
2021-11-12 2021-09-30 13F Martin Marietta Matls COM 573284106 447,719 178,245 66.15 152,977 61.36 1.0540
2021-08-09 2021-06-30 13F Martin Marietta Matls COM 573284106 269,474 -335,976 -55.49 94,804 -53.37 0.6451
2021-05-14 2021-03-31 13F Martin Marietta Matls COM 573284106 605,450 -19,036 -3.05 203,322 14.65 1.4123
2021-02-11 2020-12-31 13F Martin Marietta Matls COM 573284106 624,486 -45,025 -6.73 177,335 12.54 1.2302
2020-11-10 2020-09-30 13F Martin Marietta Matls COM 573284106 669,511 188,163 39.09 157,576 58.48 1.0900
2020-08-13 2020-06-30 13F Martin Marietta Matls COM 573284106 481,348 208,207 76.23 99,432 92.38 0.7773
2020-05-14 2020-03-31 13F Martin Marietta Matls COM 573284106 273,141 0 0.00 51,686 -32.33 0.4971
2020-02-12 2019-12-31 13F Martin Marietta Matls COM 573284106 273,141 -78,644 -22.36 76,381 -20.79 0.5983
2019-11-05 2019-09-30 13F Martin Marietta Matls COM 573284106 351,785 -145,744 -29.29 96,424 -15.78 0.8433
2019-08-07 2019-06-30 13F Martin Marietta Matls COM 573284106 497,529 -340,538 -40.63 114,486 -32.10 1.0222
2019-05-03 2019-03-31 13F Martin Marietta Matls COM 573284106 838,067 0 0.00 168,602 17.05 1.5489
2019-02-12 2018-12-31 13F Martin Marietta Matls COM 573284106 838,067 -19,024 -2.22 144,039 -7.64 1.3674
2018-11-07 2018-09-30 13F Martin Marietta Matls COM 573284106 857,091 182,668 27.09 155,948 3.54 1.3839
2018-08-07 2018-06-30 13F Martin Marietta Matls COM 573284106 674,423 113,495 20.23 150,619 29.53 1.4453
2018-05-09 2018-03-31 13F Martin Marietta Matls COM 573284106 560,928 -156,325 -21.79 116,280 -26.66 1.1570
2018-02-08 2017-12-31 13F Martin Marietta Matls COM 573284106 717,253 28,032 4.07 158,542 11.54 1.5080
2017-11-08 2017-09-30 13F Martin Marietta Matls COM 573284106 689,221 150,661 27.97 142,138 18.57 1.4063
2017-08-10 2017-06-30 13F Martin Marietta Matls COM 573284106 538,560 0 0.00 119,873 1.98 1.2233
2017-05-11 2017-03-31 13F Martin Marietta Matls COM 573284106 538,560 -251,255 -31.81 117,541 -32.82 1.2478
2017-02-13 2016-12-31 13F Martin Marietta Matls COM 573284106 789,815 -333,635 -29.70 174,968 -13.05 2.1299
2016-11-14 2016-09-30 13F Martin Marietta Matls COM 573284106 1,123,450 0 0.00 201,221 -6.71 2.3305
2016-08-10 2016-06-30 13F Martin Marietta Matls COM 573284106 1,123,450 -438,978 -28.10 215,702 -13.45 2.4688
2016-05-10 2016-03-31 13F Martin Marietta Matls COM 573284106 1,562,428 -378,312 -19.49 249,223 -5.98 2.8325
2016-02-16 2015-12-31 13F Martin Marietta Matls COM 573284106 1,940,740 -619,466 -24.20 265,066 -31.86 3.0146
2015-11-13 2015-09-30 13F Martin Marietta Matls COM 573284106 2,560,206 80,000 3.23 389,023 10.84 4.3248
2015-08-10 2015-06-30 13F Martin Marietta Matls COM 573284106 2,480,206 450,000 22.17 350,974 23.66 3.5989
2015-05-13 2015-03-31 13F Martin Marietta Matls COM 573284106 2,030,206 490,256 31.84 283,823 67.07 2.9569
2015-02-12 2014-12-31 13F Martin Marietta Matls COM 573284106 1,539,950 1,248,000 427.47 169,887 351.30 1.8177
2014-11-12 2014-09-30 13F Martin Marietta Matls COM 573284106 291,950 119,600 69.39 37,644 65.40 0.4035
2014-08-08 2014-06-30 13F Martin Marietta Matls COM 573284106 172,350 -128,650 -42.74 22,759 -41.09 0.2365
2014-05-14 2014-03-31 13F Martin Marietta Matls COM 573284106 301,000 -234,000 -43.74 38,633 -27.75 0.4380
2014-02-12 2013-12-31 13F Martin Marietta Matls COM 573284106 535,000 78,000 17.07 53,468 19.18 0.5919
2013-11-14 2013-09-30 13F Martin Marietta Matls COM 573284106 457,000 78,000 20.58 44,864 20.28 0.5471
2013-08-13 2013-06-30 13F Martin Marietta Matls COM 573284106 379,000 379,000 37,301 0.4759
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.