Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionUSS Investment Management Ltd
Latest Disclosed Ownership10,605 shares
Latest Disclosed Value $ 6,246,345
USS Investment Management Ltd ownership in MLM / Martin Marietta Materials, Inc.

On April 24, 2026 - USS Investment Management Ltd filed a 13F-HR form disclosing ownership of 10,605 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $6,246,345 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,605 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.00% 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)
2026-04-24 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,605 0 0.00 6,246 -5.44 0.0244
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,605 0 0.00 6,605 -1.12 0.0307
2025-11-13 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,605 0 0.00 6,681 14.80 0.0304
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,605 0 0.00 5,819 14.80 0.0345
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,605 0 0.00 5,069 -7.45 0.0370
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,605 -3,390 -24.22 5,477 -27.26 0.0382
2024-11-13 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,995 1,086 8.41 7,531 7.68 0.0549
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,909 276 2.18 6,993 -9.73 0.0556
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,633 -795 -5.92 7,748 15.63 0.0634
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 13,428 -2,100 -13.52 6,701 5.11 0.0597
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 15,528 2,074 15.42 6,374 2.71 0.0690
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,454 1,109 8.98 6,206 41.69 0.0733
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,345 10,245 487.86 4,381 517.77 0.0596
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,100 0 0.00 709 4.73 0.0099
2022-11-08 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,100 -4,615 -68.73 677 -66.32 0.0099
2022-08-12 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,715 -945 -12.34 2,010 -31.84 0.0201
2022-07-18 2022-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 7,660 -8,196 -51.69 2,949 -57.77 0.0242
2022-05-13 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,660 -8,196 2,949 0.0247
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 15,856 0 0.00 6,983 28.91 0.0529
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 15,856 3,090 24.20 5,417 20.59 0.0457
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,766 0 0.00 4,492 4.68 0.0355
2021-05-12 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,766 0 0.00 4,291 18.31 0.0370
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,766 0 0.00 3,627 20.66 0.0329
2020-10-30 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,766 0 0.00 3,006 13.99 0.0290
2020-08-11 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,766 12,766 2,637 0.0276
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.