Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionSkylands Capital, LLC
Latest Disclosed Ownership5,810 shares
Latest Disclosed Value $ 3,420,231
Skylands Capital, LLC reports 2.27% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On April 22, 2026 - Skylands Capital, LLC filed a 13F-HR form disclosing ownership of 5,810 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $3,420,231 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 5,945 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -2.27% 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)
2026-04-22 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,810 -135 -2.27 3,420 -7.59 0.4482
2026-01-30 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,945 0 0.00 3,702 -1.23 0.5022
2025-11-06 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,945 -1,675 -21.98 3,747 -10.42 0.5179
2025-08-08 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,620 -2,745 -26.48 4,183 -15.58 0.6066
2025-04-25 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,365 -60 -0.58 4,956 -7.97 0.7154
2025-02-04 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,425 1,375 15.19 5,385 10.53 0.7522
2024-11-01 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,050 50 0.56 4,871 -0.10 0.6609
2024-07-26 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,000 1,590 21.46 4,876 7.19 0.6913
2024-05-03 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,410 -400 -5.12 4,549 16.76 0.6284
2024-02-05 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,810 -120 -1.51 3,896 19.69 0.5736
2023-10-27 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,930 -75 -0.94 3,255 -11.91 0.4920
2023-08-03 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,005 -2,425 -23.25 3,696 -0.22 0.5303
2023-05-04 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,430 -1,600 -13.30 3,703 -8.91 0.5416
2023-02-09 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,030 3,575 42.28 4,066 49.28 0.6440
2022-11-01 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 8,455 -1,200 -12.43 2,723 -5.75 0.4474
2022-07-28 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,655 975 11.23 2,889 -13.53 0.4235
2022-05-05 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,680 0 0.00 3,341 -12.63 0.4044
2022-02-08 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,680 -2,185 -20.11 3,824 3.02 0.4415
2021-11-02 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,865 -250 -2.25 3,712 -5.06 0.4586
2021-08-02 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 11,115 -50 -0.45 3,910 4.29 0.4631
2021-05-04 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,165 -3,525 -24.00 3,749 -10.14 0.4777
2021-02-09 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,690 -18,735 -56.05 4,172 -46.97 0.6051
2020-10-27 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 33,425 4,845 16.95 7,867 33.25 1.3117
2020-07-29 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 28,580 11,510 67.43 5,904 82.79 1.0434
2020-04-27 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,070 1,110 6.95 3,230 -27.63 0.7165
2020-02-11 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 15,960 -3,900 -19.64 4,463 -18.02 0.6480
2019-10-29 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 19,860 -8,665 -30.38 5,444 -17.06 0.7917
2019-07-29 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 28,525 -4,075 -12.50 6,564 0.09 0.9029
2019-04-30 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 32,600 -2,300 -6.59 6,558 9.34 0.9070
2019-02-07 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 34,900 11,225 47.41 5,998 39.23 0.9844
2018-10-22 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 23,675 6,075 34.52 4,308 9.59 0.5566
2018-07-24 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 17,600 1,325 8.14 3,931 16.51 0.5174
2018-04-19 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 16,275 0 0.00 3,374 -6.20 0.4448
2018-01-16 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 16,275 1,400 9.41 3,597 17.24 0.4634
2017-10-19 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 14,875 1,200 8.78 3,068 0.79 0.4079
2017-07-20 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,675 -1,575 -10.33 3,044 -8.53 0.4210
2017-04-17 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 15,250 -1,825 -10.69 3,328 -12.03 0.4582
2017-01-19 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,075 -1,425 -7.70 3,783 14.15 0.5751
2016-10-18 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 18,500 7,750 72.09 3,314 60.56 0.5189
2016-07-25 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,750 -4,225 -28.21 2,064 -13.60 0.3373
2016-04-14 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 14,975 7,050 88.96 2,389 120.79 0.3820
2016-01-19 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,925 5,250 196.26 1,082 166.50 0.1546
2015-10-14 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,675 -2,725 -50.46 406 -46.86 0.0546
2015-07-16 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,400 -5,100 -48.57 764 -47.96 0.0821
2015-04-16 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,500 -100 -0.94 1,468 25.58 0.1490
2015-01-23 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,600 10,300 3,433.33 1,169 2,897.44 0.1196
2014-10-23 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 300 -100 -25.00 39 -26.42 0.0040
2014-07-22 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 400 -9,300 -95.88 53 -95.74 0.0052
2014-04-21 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,700 -125 -1.27 1,245 26.78 0.1284
2014-01-23 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,825 700 7.67 982 9.60 0.1066
2013-10-22 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,125 4,025 78.92 896 78.49 0.0999
2013-07-25 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,100 5,100 502 0.0602
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.