Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionFamily Management Corp
Latest Disclosed Ownership660 shares
Latest Disclosed Value $ 388,529
Family Management Corp reports 5.58% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Family Management Corp filed a 13F-HR form disclosing ownership of 660 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $388,529 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 699 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -5.58% 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)
2026-05-15 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 660 -39 -5.58 389 -10.80 0.0466
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 699 106 17.88 435 16.62 0.0550
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 593 -23 -3.73 374 10.36 0.0514
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 616 25 4.23 338 19.86 0.0506
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 591 591 283 0.0462
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -6,510 -100.00 0 -100.00
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,510 -71 -1.08 2,506 -13.56 0.6946
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 6,581 110 1.70 2,899 31.12 0.7532
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,471 64 1.00 2,211 -1.91 0.6101
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,407 55 0.87 2,254 5.67 0.5967
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,352 6,352 2,133 0.6702
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.