Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionProsperity Consulting Group, LLC
Latest Disclosed Ownership821 shares
Latest Disclosed Value $ 483,323
Prosperity Consulting Group, LLC reports 0.24% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 5, 2026 - Prosperity Consulting Group, LLC filed a 13F-HR form disclosing ownership of 821 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $483,323 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 819 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.24% 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)
2026-05-05 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 821 2 0.24 483 -5.11 0.0215
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 819 36 4.60 510 3.25 0.0229
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 783 63 8.75 494 24.81 0.0243
2025-08-05 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 720 -7 -0.96 395 13.83 0.0288
2025-05-07 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 727 -9 -1.22 348 -8.68 0.0269
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 736 42 6.05 380 1.88 0.0286
2024-10-15 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 694 -8 -1.14 374 -1.84 0.0291
2024-08-08 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 702 145 26.03 380 11.44 0.0516
2024-05-01 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 557 109 24.33 342 52.91 0.0429
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 448 448 224 0.0749
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.