Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionGAMMA Investing LLC
Latest Disclosed Ownership2,540 shares
Latest Disclosed Value $ 1,495,247
GAMMA Investing LLC reports 7.76% increase in ownership of MLM / Martin Marietta Materials, Inc.

On April 6, 2026 - GAMMA Investing LLC filed a 13F-HR form disclosing ownership of 2,540 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $1,495,247 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 5, 2026 disclosing 2,357 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 7.76% 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)
2026-04-06 2026-03-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 2,540 183 7.76 1,495 1.91 0.0698
2026-01-05 2025-12-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 2,357 383 19.40 1,468 17.93 0.0737
2025-10-02 2025-09-30 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,974 250 14.50 1,244 31.50 0.0686
2025-07-14 2025-06-30 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,724 265 18.16 946 35.72 0.0598
2025-04-15 2025-03-31 13F/A-1 MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,459 270 22.71 698 13.52 0.0523
2025-04-07 2025-03-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 697,592 696,403 1 0.0078
2025-01-03 2024-12-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,189 26 2.24 614 -1.76 0.0524
2024-10-04 2024-09-30 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,163 190 626 0.0621
2024-10-07 2024-09-30 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 1,163 190 19.53 626 18.60 0.0621
2024-07-02 2024-06-30 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 973 155 18.95 527 4.98 0.0718
2024-04-05 2024-03-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 818 149 22.27 502 47.65 0.1023
2024-02-01 2023-12-31 13F MARTIN MARIETTA MATLS INC COM Common Stock 573284106 669 669 340 0.0921
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.