Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionFenimore Asset Management Inc
Latest Disclosed Ownership88,327 shares
Latest Disclosed Value $ 51,996,338
Fenimore Asset Management Inc reports 1.78% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Fenimore Asset Management Inc filed a 13F-HR form disclosing ownership of 88,327 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $51,996,338 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 89,928 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -1.78% 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 Mat COM 573284106 88,327 -1,601 -1.78 51,996 -7.14 1.1596
2026-02-02 2025-12-31 13F Martin Marietta Mat COM 573284106 89,928 271 0.30 55,995 -0.91 1.1661
2025-10-20 2025-09-30 13F Martin Marietta Mat COM 573284106 89,657 807 0.91 56,509 15.86 1.1329
2025-07-22 2025-06-30 13F Martin Marietta Mat COM 573284106 88,850 5,010 5.98 48,775 21.68 0.9734
2025-04-14 2025-03-31 13F Martin Marietta Mat COM 573284106 83,840 3,933 4.92 40,086 -2.87 0.8490
2025-01-21 2024-12-31 13F Martin Marietta Mat COM 573284106 79,907 525 0.66 41,272 -3.41 0.8671
2024-11-14 2024-09-30 13F Martin Marietta Mat COM 573284106 79,382 7,577 10.55 42,727 9.83 0.8607
2024-08-14 2024-06-30 13F Martin Marietta Mat COM 573284106 71,805 3,176 4.63 38,904 -7.67 0.8521
2024-04-30 2024-03-31 13F Martin Marietta Mat COM 573284106 68,629 21,590 45.90 42,134 79.54 0.8899
2024-01-23 2023-12-31 13F Martin Marietta Mat COM 573284106 47,039 47,039 23,468 0.5448
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.