Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionWelch Group, LLC
Latest Disclosed Ownership1,015 shares
Latest Disclosed Value $ 597,511
Welch Group, LLC ownership in MLM / Martin Marietta Materials, Inc.

On April 21, 2026 - Welch Group, LLC filed a 13F-HR form disclosing ownership of 1,015 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $597,511 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 1,015 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)
2026-04-21 2026-03-31 13F MARTIN MARIETTA MATLS COMMON 573284106 1,015 0 0.00 598 -5.54 0.0224
2026-01-26 2025-12-31 13F MARTIN MARIETTA MATLS COMMON STOCK 573284106 1,015 -20 -1.93 632 -3.07 0.0244
2025-10-14 2025-09-30 13F MARTIN MARIETTA MATLS COMMON 573284106 1,035 0 0.00 652 14.79 0.0255
2025-07-25 2025-06-30 13F MARTIN MARIETTA MATLS COMMON 573284106 1,035 0 0.00 568 14.98 0.0237
2025-04-08 2025-03-31 13F MARTIN MARIETTA MATLS COMMON 573284106 1,035 0 0.00 495 -8.18 0.0218
2025-01-27 2024-12-31 13F MARTIN MARIETTA MATLS COMMON 573284106 1,035 7 0.68 538 -2.71 0.0242
2024-10-24 2024-09-30 13F MARTIN MARIETTA MATLS COMMON 573284106 1,028 8 0.78 553 0.18 0.0241
2024-07-17 2024-06-30 13F MARTIN MARIETTA MATLS COMMON 573284106 1,020 -168 -14.14 553 -24.28 0.0266
2024-04-09 2024-03-31 13F MARTIN MARIETTA MATLS COMMON 573284106 1,188 -186 -13.54 729 6.42 0.0362
2024-01-23 2023-12-31 13F MARTIN MARIETTA MATLS Common 573284106 1,374 100 7.85 686 31.23 0.0369
2023-10-18 2023-09-30 13F MARTIN MARIETTA MATLS Common 573284106 1,274 0 0.00 523 -11.22 0.0310
2023-07-18 2023-06-30 13F MARTIN MARIETTA MATLS Common 573284106 1,274 103 8.80 588 41.69 0.0337
2023-04-13 2023-03-31 13F MARTIN MARIETTA MATLS Common 573284106 1,171 340 40.91 416 48.21 0.0242
2023-01-30 2022-12-31 13F MARTIN MARIETTA MATLS Common 573284106 831 0 0.00 281 4.48 0.0161
2022-10-13 2022-09-30 13F MARTIN MARIETTA MATLS COMMON 573284106 831 0 0.00 268 7.63 0.0174
2022-07-21 2022-06-30 13F MARTIN MARIETTA MATLS COMMON 573284106 831 0 0.00 249 -22.19 0.0152
2022-04-29 2022-03-31 13F MARTIN MARIETTA MATLS COMMON 573284106 831 0 0.00 320 -12.57 0.0183
2022-01-26 2021-12-31 13F MARTIN MARIETTA MATLS COMMON 573284106 831 0 0.00 366 28.87 0.0214
2021-11-05 2021-09-30 13F MARTIN MARIETTA MATLS COMMON 573284106 831 0 0.00 284 -2.74 0.0192
2021-07-21 2021-06-30 13F MARTIN MARIETTA MATLS COMMON 573284106 831 40 5.06 292 9.77 0.0199
2021-04-23 2021-03-31 13F MARTIN MARIETTA MATLS COMMON 573284106 791 -185 -18.95 266 -3.97 0.0191
2021-01-25 2020-12-31 13F MARTIN MARIETTA MATLS Common 573284106 976 0 0.00 277 20.43 0.0222
2020-10-28 2020-09-30 13F MARTIN MARIETTA MATLS Common 573284106 976 0 0.00 230 13.86 0.0201
2020-07-22 2020-06-30 13F MARTIN MARIETTA MATLS Common 573284106 976 0 0.00 202 9.19 0.0189
2020-04-28 2020-03-31 13F MARTIN MARIETTA MATLS Common 573284106 976 976 185 0.0197
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.