Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionFmr Llc
Latest Disclosed Ownership2,607,979 shares
Latest Disclosed Value $ 1,535,264,877
Fmr Llc reports 10.74% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 2,607,979 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $1,535,265,078 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,921,794 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -10.74% during the quarter. The current value of the position is $1,520,842,954 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,607,979 -313,815 -10.74 1,535,265 -15.61 0.0161
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,921,794 42,247 1.47 1,819,284 0.24 0.0928
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,879,547 -130,615 -4.34 1,814,921 9.83 0.0944
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,010,162 352,258 13.25 1,652,458 30.03 0.0932
2025-05-12 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,657,904 144,248 5.74 1,270,823 -2.12 0.0811
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,513,656 -1,785 -0.07 1,298,303 -4.11 0.0775
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,515,441 334,605 15.34 1,353,936 14.59 0.0824
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,180,836 149,635 7.37 1,181,577 -5.25 0.0756
2024-05-13 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,031,201 303,263 17.55 1,247,036 44.65 0.0837
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,727,938 -106,021 -5.78 862,085 14.52 0.0662
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,833,959 1,270,116 225.26 752,803 189.18 0.0651
2023-08-11 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 563,843 29,117 5.45 260,321 37.11 0.0218
2023-08-11 2023-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 534,726 -1,403 -0.26 189,860 4.78 0.0174
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 534,726 -1,403 189,860 0.0035
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 536,129 29,476 5.82 181,195 11.04 0.0180
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 506,653 -55,422 -9.86 163,187 -2.98 0.0170
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 562,075 -74,122 -11.65 168,194 -31.31 0.0168
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 636,197 47,973 8.16 244,865 -5.50 0.0196
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 588,224 29,464 5.27 259,123 35.73 0.0191
2022-02-14 2021-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 558,760 -53,842 -8.79 190,917 -11.42 0.0151
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 558,760 -53,842 190,917 0.0151
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 612,602 -48,504 -7.34 215,520 -2.92 0.0169
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 661,106 -54,488 -7.61 222,012 9.25 0.0190
2021-02-08 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 715,594 -53,310 -6.93 203,208 12.29 0.0181
2020-11-13 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 768,904 -509,277 -39.84 180,970 -31.46 0.0183
2020-08-24 2020-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,278,181 -305,152 -19.27 264,033 -11.88 0.0290
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,278,181 -305,152 264,033 6,486.5182
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,583,333 -54,472 -3.33 299,613 -34.58 0.0415
2020-02-07 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,637,805 1,615 0.10 457,996 2.12 0.0505
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,636,190 -241,837 -12.88 448,480 3.78 0.0538
2019-08-13 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,878,027 177,441 10.43 432,153 26.32 0.0505
2019-05-13 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,700,586 228,367 15.51 342,123 35.21 0.0410
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,472,219 -366,296 -19.92 253,030 -24.36 0.0347
2018-11-09 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,838,515 7,195 0.39 334,517 -18.21 0.0376
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,831,320 503,126 37.88 408,988 48.54 0.0483
2018-05-14 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,328,194 286,604 27.52 275,335 19.59 0.0327
2018-02-12 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,041,590 -299,698 -22.34 230,233 -16.77 0.0270
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,341,288 -1,575,217 -54.01 276,614 -57.39 0.0334
2017-08-29 2017-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 2,916,505 -91,503 -3.04 649,155 -1.12 0.0807
2017-08-11 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,916,505 -91,503 649,155
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,008,008 -17,383 -0.57 656,497 -2.05 0.0834
2017-02-10 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,025,391 637,966 26.72 670,215 56.73 0.0896
2016-11-14 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,387,425 25,380 1.07 427,611 -5.71 0.0569
2016-08-11 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,362,045 338,399 16.72 453,512 40.50 0.0619
2016-05-16 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,023,646 -594,577 -22.71 322,792 -9.73 0.0447
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,618,223 54,443 2.12 357,597 -8.21 0.0481
2015-11-10 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,563,780 736,201 40.28 389,567 50.63 0.0555
2015-08-25 2015-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,827,579 844,594 85.92 258,621 88.20 0.0331
2015-08-13 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,827,579 258,621
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 982,985 -425,253 -30.20 137,421 -11.55 0.0175
2015-02-17 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,408,238 -477,049 -25.30 155,357 -36.09 0.0202
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,885,287 -115,264 -5.76 243,089 -7.98 0.0329
2014-08-14 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,000,551 -84,781 -4.07 264,173 -1.30 0.0354
2014-05-15 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 2,085,332 53,570 2.64 267,652 31.81 0.0372
2014-02-13 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,031,762 107,951 5.61 203,054 7.52 0.0287
2013-11-14 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,923,811 191,011 11.02 188,860 10.74 0.0289
2013-09-24 2013-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,732,800 1,732,800 170,542 0.0279
2013-08-14 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,732,800 170,542 0.0279
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.