Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionWellington Management Group Llp
Latest Disclosed Ownership1,524 shares
Latest Disclosed Value $ 897,149
Wellington Management Group Llp reports 123.46% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Wellington Management Group Llp filed a 13F-HR form disclosing ownership of 1,524 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $897,149 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 682 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 123.46% 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,524 842 123.46 897 111.56 0.0000
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 682 -579 -45.92 425 -46.60 0.0001
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,261 500 65.70 795 90.41 0.0001
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 761 299 64.72 418 89.55 0.0001
2025-05-13 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 462 14 3.12 221 -4.76 0.0000
2025-02-12 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 448 23 5.41 231 1.32 0.0000
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 425 38 9.82 229 9.09 0.0000
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 387 -217 -35.93 210 -43.51 0.0000
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 604 107 21.53 371 49.80 0.0001
2024-02-12 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 497 -151 -23.30 248 -6.79 0.0000
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 648 -481 -42.60 266 -49.14 0.0001
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,129 1,129 521 0.0001
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -794 -100.00 0 -100.00
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 794 160 25.24 237 -2.87 0.0000
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 634 45 7.64 244 -6.15 0.0000
2022-02-11 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 589 -9 -1.51 260 27.45 0.0000
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 598 -5 -0.83 204 -3.77 0.0000
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 603 -3,648 -85.82 212 -85.14 0.0000
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,251 -702 -14.17 1,427 1.42 0.0003
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,953 -239,435 -97.97 1,407 -97.55 0.0003
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 244,388 -60,350 -19.80 57,520 -8.63 0.0119
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 304,738 299,761 6,022.93 62,950 6,582.59 0.0140
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,977 -607 -10.87 942 -39.69 0.0002
2020-02-11 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,584 -3,144 -36.02 1,562 -34.73 0.0003
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,728 -17,907 -67.23 2,393 -60.95 0.0005
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 26,635 1,896 7.66 6,128 23.13 0.0014
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 24,739 -66,665 -72.93 4,977 -68.32 0.0011
2019-02-14 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 91,404 -949 -1.03 15,709 -6.52 0.0039
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 92,353 -51,594 -35.84 16,804 -47.73 0.0035
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 143,947 -11,173 -7.20 32,147 -0.03 0.0072
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 155,120 8,767 5.99 32,157 -0.59 0.0073
2018-02-13 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 146,353 -88,754 -37.75 32,349 -33.28 0.0071
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 235,107 -6,144 -2.55 48,486 -9.71 0.0111
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 241,251 18,053 8.09 53,698 10.23 0.0126
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 223,198 -111,925 -33.40 48,713 -34.38 0.0117
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 335,123 13,466 4.19 74,239 28.86 0.0186
2016-11-14 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 321,657 68,495 27.06 57,612 18.53 0.0144
2016-08-15 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 253,162 -88,359 -25.87 48,607 -10.78 0.0126
2016-05-13 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 341,521 2,045 0.60 54,477 17.49 0.0143
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 339,476 -74,038 -17.90 46,366 -26.21 0.0121
2015-11-16 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 413,514 -72,756 -14.96 62,834 -8.69 0.0175
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 486,270 -1,106,930 -69.48 68,814 -69.10 0.0178
2015-05-15 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,593,200 -343,096 -17.72 222,730 4.27 0.0573
2015-02-13 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,936,296 1,301,114 204.84 213,611 160.82 0.0565
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 635,182 522,143 461.91 81,900 448.67 0.0226
2014-08-14 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 113,039 113,039 14,927 0.0040
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.