Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership62,049 shares
Latest Disclosed Value $ 36,535,401
Advisor Group Holdings, Inc. reports 0.33% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 62,049 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $36,535,401 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 62,256 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -0.33% 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 62,049 -207 -0.33 36,535 -5.77 0.0311
2026-02-17 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 62,256 -2,151 -3.34 38,772 -4.38 0.0567
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 64,407 56,448 709.23 40,548 856.30 0.0568
2025-09-04 2025-06-30 13F/A-1 ARTIN MARIETTA MATLS COM 573284106 7,959 2,547 47.06 4,240 63.64 0.0075
2025-08-13 2025-06-30 13F ARTIN MARIETTA MATLS COM 573284106 7,819 2,407 4,050 0.0047
2025-05-12 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,412 -3,157 -36.84 2,591 1.09 0.0058
2025-06-06 2024-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 8,569 3,246 60.98 2,563 -10.60 0.0058
2025-02-07 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,002 1,679 1,794 0.0046
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,323 120 2.31 2,867 1.70 0.0065
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,203 486 10.30 2,820 -2.66 0.0067
2024-05-10 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,717 -9,527 -66.88 2,897 -59.26 0.0065
2024-02-12 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,244 -2,084 -12.76 7,110 6.04 0.0124
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 16,328 4,913 43.04 6,704 27.50 0.0099
2023-08-21 2023-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 11,415 2,346 25.87 5,258 63.80 0.0094
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,797 3,728 5,257 0.0014
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,069 534 6.26 3,210 11.30 0.0060
2023-02-10 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,535 713 9.12 2,885 14.40 0.0058
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,822 -735 -8.59 2,521 -1.41 0.0058
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,557 -94 -1.09 2,557 -38.53 0.0056
2022-05-04 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,651 -548 -5.96 4,160 2.69 0.0081
2022-02-03 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,199 -181 -1.93 4,051 25.38 0.0077
2021-11-05 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,380 -363 -3.73 3,231 -5.86 0.0067
2021-08-02 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,743 3,205 49.02 3,432 56.28 0.0074
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 6,538 225 3.56 2,196 22.41 0.0053
2021-02-10 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 6,313 356 5.98 1,794 30.38 0.0048
2020-11-12 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,957 -396 -6.23 1,376 4.80 0.0041
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,353 -994 -13.53 1,313 -4.58 0.0044
2020-05-18 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,347 7,347 1,376 0.0056
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.