Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionMather Group, Llc.
Latest Disclosed Ownership421 shares
Latest Disclosed Value $ 247,628
Mather Group, Llc. reports 13.37% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On April 13, 2026 - Mather Group, Llc. filed a 13F-HR form disclosing ownership of 421 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $247,628 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 13, 2026 disclosing 486 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -13.37% 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)
2026-04-13 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 421 -65 -13.37 248 -18.21 0.0025
2026-01-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 486 65 15.44 303 13.96 0.0031
2025-10-21 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 421 6 1.45 265 16.74 0.0027
2025-07-15 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 415 137 49.28 228 70.68 0.0024
2025-04-25 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 278 110 65.48 133 54.65 0.0015
2025-01-27 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 168 4 2.44 87 -2.27 0.0011
2024-10-07 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 164 -3 -1.80 88 -13.73 0.0011
2024-07-09 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 167 20 13.61 103 39.73 0.0013
2024-04-09 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 147 147 73 0.0012
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.