Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership110,538 shares
Latest Disclosed Value $ 65,071,398
Rhumbline Advisers reports 0.88% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 110,538 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $65,071,398 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 111,520 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.88% 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)
2026-05-12 2026-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 110,538 -982 -0.88 65,071 -6.29 0.0557
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 111,520 -3,014 -2.63 69,439 -3.81 0.0561
2025-11-06 2025-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 114,534 -290 -0.25 72,188 14.52 0.0580
2025-08-12 2025-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 114,824 -3,134 -2.66 63,034 11.76 0.0540
2025-05-29 2025-03-31 13F/A-1 MARTIN MARIETTA MATLS INC COM COM 573284106 117,958 7,362 6.66 56,399 -1.27 0.0528
2025-04-08 2025-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 117,958 7,362 56,399 0.0528
2025-05-29 2024-12-31 13F/A-1 MARTIN MARIETTA MATLS INC COM COM 573284106 110,596 -1,578 -1.41 57,123 -5.39 0.0511
2025-01-30 2024-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 110,596 -1,578 57,123 0.0511
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 112,174 -3,593 -3.10 60,378 -3.74 0.0545
2024-08-01 2024-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 115,767 -2,020 -1.71 62,722 -13.26 0.0589
2024-05-09 2024-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 117,787 -14 -0.01 72,314 23.04 0.0694
2024-02-08 2023-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 117,801 -2,095 -1.75 58,772 19.42 0.0616
2023-11-09 2023-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 119,896 -397 -0.33 49,215 -11.39 0.0571
2023-08-08 2023-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 120,293 -331 -0.27 55,538 132,133.33 0.0622
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 120,624 2,047 1.73 43 -99.90 0.0528
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 118,577 3,125 2.71 40,075 7.77 0.0539
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 115,452 3,583 3.20 37,186 11.08 0.0554
2022-08-11 2022-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 111,869 11,976 11.99 33,476 -12.93 0.0489
2022-05-12 2022-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 99,893 2,537 2.61 38,448 -10.35 0.0495
2022-02-10 2021-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 97,356 1,110 1.15 42,887 30.42 0.0526
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 96,246 -2,997 -3.02 32,885 -5.81 0.0445
2021-08-05 2021-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 99,243 -3,458 -3.37 34,915 1.24 0.0458
2021-05-06 2021-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 102,701 -5,005 -4.65 34,489 12.76 0.0469
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 107,706 2,230 2.11 30,585 23.20 0.0422
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 105,476 -1,038 -0.97 24,825 12.83 0.0389
2020-08-13 2020-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 106,514 -4,599 -4.14 22,003 4.65 0.0367
2020-05-06 2020-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 111,113 6,349 6.06 21,026 -28.23 0.0441
2020-02-05 2019-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 104,764 3,317 3.27 29,296 5.35 0.0490
2019-10-23 2019-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 101,447 1,421 1.42 27,807 20.81 0.0508
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 100,026 -7,620 -7.08 23,017 6.28 0.0432
2019-05-01 2019-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 107,646 -4,936 -4.38 21,656 11.92 0.0419
2019-01-31 2018-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 112,582 -2,938 -2.54 19,349 -7.95 0.0421
2018-11-07 2018-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 115,520 -2,300 -1.95 21,019 -20.12 0.0406
2018-08-06 2018-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 117,820 -7,405 -5.91 26,313 1.36 0.0531
2018-05-02 2018-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 125,225 -3,092 -2.41 25,959 -8.48 0.0542
2018-02-09 2017-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 128,317 -1,845 -1.42 28,363 5.66 0.0576
2017-11-06 2017-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 130,162 402 0.31 26,843 -7.06 0.0584
2017-08-02 2017-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 129,760 1,064 0.83 28,882 2.83 0.0659
2017-05-02 2017-03-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 128,696 3,529 2.82 28,088 1.30 0.0656
2017-01-27 2016-12-31 13F MARTIN MARIETTA MATLS INC COM COM 573284106 125,167 15,341 13.97 27,728 40.96 0.0703
2016-11-08 2016-09-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 109,826 3,484 3.28 19,671 -3.66 0.0542
2016-08-11 2016-06-30 13F MARTIN MARIETTA MATLS INC COM COM 573284106 106,342 15,031 16.46 20,418 40.19 0.0605
2016-05-02 2016-03-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 91,311 2,667 3.01 14,565 20.30 0.0452
2016-02-03 2015-12-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 88,644 1,305 1.49 12,107 -8.77 0.0390
2015-11-04 2015-09-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 87,339 3,125 3.71 13,271 11.36 0.0451
2015-08-04 2015-06-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 84,214 -1,329 -1.55 11,917 -0.35 0.0380
2015-05-12 2015-03-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 85,543 -5,253 -5.79 11,959 19.39 0.0345
2015-02-06 2014-12-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 90,796 -1,526 -1.65 10,017 -15.85 0.0291
2014-11-12 2014-09-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 92,322 22,874 32.94 11,904 29.80 0.0358
2014-08-06 2014-06-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 69,448 -6,798 -8.92 9,171 -6.28 0.0269
2014-05-06 2014-03-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 76,246 4,414 6.14 9,786 36.31 0.0290
2014-02-03 2013-12-31 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 71,832 -5,951 -7.65 7,179 -5.98 0.0212
2013-11-05 2013-09-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 77,783 -1,052 -1.33 7,636 -1.59 0.0237
2013-08-07 2013-06-30 13F MARTIN MARIETTA MATERIALS COMM COM 573284106 78,835 78,835 7,759 0.0249
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.