Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionSoutheast Asset Advisors Inc.
Latest Disclosed Ownership7,487 shares
Latest Disclosed Value $ 4,407,447
Southeast Asset Advisors Inc. reports 0.42% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 13, 2026 - Southeast Asset Advisors Inc. filed a 13F-HR form disclosing ownership of 7,487 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $4,407,447 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 7,456 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.42% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,487 31 0.42 4,407 -5.06 0.4830
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,456 424 6.03 4,643 4.74 0.4408
2025-11-07 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,032 -340 -4.61 4,432 9.54 0.4826
2025-08-12 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,372 5 0.07 4,047 14.88 0.4810
2025-05-14 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,367 -1,838 -19.97 3,522 -25.92 0.4319
2025-02-13 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,205 -1,737 -15.87 4,754 -19.27 0.5833
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,942 -1,747 -13.77 5,890 -14.33 0.6514
2024-08-12 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,689 -105 -0.82 6,875 -12.48 0.8265
2024-05-14 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,794 357 2.87 7,855 26.60 0.9453
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,437 -204 -1.61 6,205 19.58 0.8224
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,641 -3,194 -20.17 5,189 -29.03 0.7292
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 15,835 -1,499 -8.65 7,311 18.78 1.0409
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,334 -26 -0.15 6,155 4.89 0.9232
2023-02-09 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,360 -2,603 -13.04 5,867 -8.76 0.9319
2022-11-04 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 19,963 221 1.12 6,430 8.84 1.0932
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 19,742 1,194 6.44 5,908 -17.24 0.9320
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 18,548 1,493 8.75 7,139 -4.98 0.9474
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,055 253 1.51 7,513 30.87 1.0308
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 16,802 2,962 21.40 5,741 17.91 0.9422
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,840 69 0.50 4,869 5.28 0.7977
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 13,771 -4,182 -23.29 4,625 -9.28 0.8302
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,953 -455 -2.47 5,098 17.66 1.0115
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 18,408 257 1.42 4,333 15.58 0.9711
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 18,151 0 0.00 3,749 9.14 0.9292
2020-04-10 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 18,151 2,732 17.72 3,435 -20.34 1.0031
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 15,419 -1,280 -7.67 4,312 -5.79 1.0253
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 16,699 -1,327 -7.36 4,577 10.34 1.1692
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 18,026 766 4.44 4,148 19.47 1.0870
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,260 309 1.82 3,472 19.19 0.9296
2019-02-13 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 16,951 4,387 34.92 2,913 27.43 0.8713
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,564 2,992 31.26 2,286 6.92 0.6127
2018-08-13 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,572 815 9.31 2,138 17.80 0.6154
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,757 1,591 22.20 1,815 14.58 0.5377
2018-02-14 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,166 875 13.91 1,584 22.13 0.4793
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,291 6,291 1,297 0.4103
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.