Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionColonial Trust Advisors
Latest Disclosed Ownership1,308 shares
Latest Disclosed Value $ 769,993
Colonial Trust Advisors reports 6.84% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 12, 2026 - Colonial Trust Advisors filed a 13F-HR form disclosing ownership of 1,308 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $769,993 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,404 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -6.84% 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 Stock 573284106 1,308 -96 -6.84 770 -12.01 0.0598
2026-02-12 2025-12-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 1,404 0 0.00 874 -1.13 0.0658
2025-11-10 2025-09-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 1,404 -812 -36.64 885 -27.30 0.0682
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 2,216 -260 -10.50 1,216 2.79 0.1005
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 2,476 -68 -2.67 1,184 -9.90 0.1053
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 2,544 -20 -0.78 1,314 -4.86 0.1165
2024-11-12 2024-09-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 2,564 -3,640 -58.67 1,380 -58.94 0.1193
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 6,204 94 1.54 3,361 -10.40 0.3218
2024-05-14 2024-03-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 6,110 67 1.11 3,751 24.45 0.3709
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 6,043 -635 -9.51 3,015 9.96 0.3199
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 6,678 775 13.13 2,741 0.59 0.3140
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 5,903 81 1.39 2,725 31.83 0.3029
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 5,822 660 12.79 2,067 18.52 0.2429
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 5,162 715 16.08 1,745 21.79 0.2140
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS INC COM Stock 573284106 4,447 26 0.59 1,432 8.24 0.1940
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,421 -160 -3.49 1,323 -24.96 0.1860
2022-05-09 2022-03-31 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,581 -35 -0.76 1,763 -13.28 0.2087
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,616 325 7.57 2,033 38.68 0.2274
2021-11-12 2021-09-30 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,291 30 0.70 1,466 -2.20 0.1808
2021-08-05 2021-06-30 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,261 251 6.26 1,499 11.28 0.1830
2021-05-10 2021-03-31 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,010 38 0.96 1,347 19.41 0.1770
2021-01-29 2020-12-31 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 3,972 23 0.58 1,128 21.42 0.1565
2020-10-26 2020-09-30 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 3,949 -508 -11.40 929 0.87 0.1460
2020-08-10 2020-06-30 13F MARTIN MARIETTA MATERIALSINC C CS 573284106 4,457 -349 -7.26 921 1.32 0.1571
2020-05-06 2020-03-31 13F MARTIN MARIETTA MATLS CS 573284106 4,806 -1,610 -25.09 909 -49.33 0.1902
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS CS 573284106 6,416 -575 -8.22 1,794 -6.37 0.2977
2019-11-15 2019-09-30 13F MARTIN MARIETTA MATLS CS 573284106 6,991 -1,529 -17.95 1,916 -2.29 0.3389
2019-08-21 2019-06-30 13F MARTIN MARIETTA MATLS CS 573284106 8,520 -2,569 -23.17 1,961 -12.10 0.3549
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS CS 573284106 11,089 -4,299 -27.94 2,231 -15.65 0.4234
2019-02-11 2018-12-31 13F MARTIN MARIETTA MATLS CS 573284106 15,388 -4,181 -21.37 2,645 -25.72 0.6460
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS CS 573284106 19,569 403 2.10 3,561 -16.80 0.6659
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS CS 573284106 19,166 20 0.10 4,280 7.84 0.8481
2018-05-09 2018-03-31 13F MARTIN MARIETTA MATLS CS 573284106 19,146 -4,224 -18.07 3,969 -23.17 0.8092
2018-02-21 2017-12-31 13F MARTIN MARIETTA MATLS CS 573284106 23,370 11,685 100.00 5,166 114.36 0.8007
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLSINC CS 573284106 11,685 11,685 2,410 0.5294
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.