Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionAtria Investments Llc
Latest Disclosed Ownership8,231 shares
Latest Disclosed Value $ 4,845,645
Atria Investments Llc reports 12.51% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 5, 2026 - Atria Investments Llc filed a 13F-HR form disclosing ownership of 8,231 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $4,845,645 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 7,316 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 12.51% 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)
2026-05-05 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,231 915 12.51 4,846 6.37 0.0542
2026-02-05 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,316 -277 -3.65 4,556 -4.81 0.0518
2025-11-06 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,593 -877 -10.35 4,786 2.93 0.0547
2025-08-04 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 8,470 221 2.68 4,650 17.91 0.0549
2025-05-06 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,249 -3,472 -29.62 3,944 -34.87 0.0506
2025-02-06 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,721 -214 -1.79 6,054 -5.76 0.0753
2024-11-01 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 11,935 -1,420 -10.63 6,424 -11.21 0.0798
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 13,355 1,150 9.42 7,236 -3.28 0.0937
2024-05-21 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,205 363 3.07 7,480 26.78 0.1030
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 11,842 1,348 12.85 5,900 37.08 0.0913
2023-11-07 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,494 154 1.49 4,304 -9.71 0.0767
2023-08-04 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,340 1,526 17.31 4,768 52.40 0.0861
2023-05-10 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 8,814 -645 -6.82 3,129 -2.13 0.0592
2023-01-31 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 9,459 371 4.08 3,197 9.19 0.0655
2022-11-01 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,088 1,840 25.39 2,927 34.95 0.0646
2022-08-11 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 7,248 -310 -4.10 2,169 -25.44 0.0455
2022-05-02 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,558 257 3.52 2,909 -9.55 0.0509
2022-02-04 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 7,301 411 5.97 3,216 36.62 0.0573
2021-11-16 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,890 991 16.80 2,354 13.45 0.0425
2021-08-10 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,899 1,099 22.90 2,075 28.72 0.0400
2021-05-11 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,800 -348 -6.76 1,612 10.26 0.0357
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,148 231 4.70 1,462 26.36 0.0353
2020-11-05 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,917 4,917 1,157 0.0351
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -1,058 -100.00 0 -100.00
2020-02-11 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 1,058 1,058 296 0.0080
2019-11-14 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -1,108 -100.00 0 -100.00
2019-08-26 2019-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 1,108 1,108 278 0.0104
2019-08-09 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 20,000 20,000 20
2018-10-09 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 0 -1,162 -100.00 0 -100.00
2018-07-13 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,162 1,162 260 0.0114
2018-01-12 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -1,028 -100.00 0 -100.00
2017-10-12 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,028 -4,016 -79.62 212 -81.12 0.0115
2017-07-10 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,044 1,323 35.55 1,123 38.30 0.0687
2017-04-14 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,721 1,643 79.07 812 76.52 0.0529
2017-01-13 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,078 517 33.12 460 64.29 0.0351
2016-10-12 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 1,561 412 35.86 280 24.44 0.0257
2016-07-12 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,149 -144 -11.14 225 9.22 0.0242
2016-04-19 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,293 1,293 0.00 206 0.0234
2016-01-14 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -147 -100.00 0 -100.00
2015-11-12 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 147 -1,338 -90.10 969 361.43 0.0073
2015-08-03 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 1,485 -155 -9.45 210 -8.30 0.0247
2015-04-13 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,640 1,640 0.00 229 0.0259
2015-01-12 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 0 -2,135 -100.00 0 -100.00
2014-11-12 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,135 111 5.48 275 3.00 0.0281
2014-07-21 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,024 312 18.22 267 21.36 0.0266
2014-05-12 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 1,712 -671 -28.16 220 -7.56 0.0224
2014-01-09 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,383 2,383 238 0.0237
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.