Martin Marietta Materials, Inc.
US ˙ NYSE ˙ US5732841060

SecurityMLM / Martin Marietta Materials, Inc.
InstitutionWestpac Banking Corp
Latest Disclosed Ownership158 shares
Latest Disclosed Value $ 93,011
Westpac Banking Corp ownership in MLM / Martin Marietta Materials, Inc.

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 158 shares of Martin Marietta Materials, Inc. (US:MLM) valued at $93,011 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 158 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $91,776 USD.

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)
2026-05-11 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 93 -5.10 0.0032
2026-02-10 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 98 -1.01 0.0062
2025-11-14 2025-09-30 13F/A-1 MARTIN MARIETTA MATERIALS INC USD 0.01 COM 573284106 158 0 0.00 100 15.12 0.0062
2025-11-12 2025-09-30 13F MARTIN MARIETTA MATERIALS INC USD 0.01 COM 573284106 158 0 100 0.0025
2025-08-11 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 87 14.67 0.0058
2025-05-13 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 76 -7.41 0.0056
2025-02-12 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 82 -4.71 0.0054
2024-11-08 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 158 0 0.00 85 0.00 0.0057
2024-08-14 2024-06-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 158 -83 -34.44 86 -42.18 0.0068
2024-08-13 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 542 301 86 0.0029
2024-05-09 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 241 0 0.00 148 22.50 0.0113
2024-02-08 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 241 0 0.00 120 22.45 0.0099
2023-11-13 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 241 0 0.00 99 -11.71 0.0074
2023-08-10 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 241 -4,863 -95.28 111 -93.87 0.0079
2023-05-04 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,104 231 4.74 1,812 10.09 0.0244
2023-02-06 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,873 176 3.75 1,647 8.86 0.0243
2022-11-08 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,513 7.62 0.0231
2022-08-10 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,406 -22.25 0.0183
2022-05-11 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,808 -12.66 0.0207
2022-02-08 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 2,069 28.99 0.0214
2021-10-27 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,605 -2.91 0.0172
2021-08-11 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,652 4.76 0.0166
2021-05-13 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,577 18.30 0.0174
2021-02-11 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,334 20.63 0.0151
2020-11-10 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,105 13.92 0.0150
2020-08-12 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 970 9.23 0.0145
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 889 -32.37 0.0153
2020-02-11 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,313 2.02 0.0169
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,287 19.17 0.0179
2019-08-01 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,697 0 0.00 1,081 14.41 0.0165
2019-05-14 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,697 1,167 33.06 945 55.78 0.0156
2019-02-07 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,530 0 0.00 607 -5.61 0.0103
2018-11-13 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,530 0 0.00 642 -18.53 0.0110
2018-07-18 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,530 0 0.00 788 7.80 0.0151
2018-05-01 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,530 0 0.00 732 -6.28 0.0146
2018-01-18 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,530 0 0.00 780 7.29 0.0177
2017-10-30 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,530 -80 -2.22 728 -9.46 0.0160
2017-08-09 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,610 -2,091 -36.68 804 -35.45 0.0177
2017-05-18 2017-03-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 5,701 331 6.16 1,244 2.81 0.0100
2017-05-11 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,376 821
2017-02-09 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,370 -369 -6.43 1,211 17.82 0.0114
2016-11-10 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,739 278 5.09 1,028 -2.00 0.0111
2016-08-10 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,461 197 3.74 1,049 24.91 0.0115
2016-05-13 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,264 419 8.65 840 26.93 0.0091
2016-02-11 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,845 257 5.60 662 -5.16 0.0073
2015-11-16 2015-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 4,588 1,672 57.34 697 69.17 0.0077
2015-11-12 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,407,383 258,474
2015-08-12 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,916 -2,554 -46.69 413 -49.51 0.0040
2015-05-12 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,470 1,950 55.40 817 110.31 0.0071
2015-02-11 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 3,520 111 3.26 388 -11.62 0.0037
2014-11-12 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,409 316 10.22 440 7.60 0.0043
2014-08-11 2014-06-30 13F MARTIN MARIETTA MATLS COM 573284106 3,093 0 0.00 408 3.03 0.0039
2014-05-12 2014-03-31 13F MARTIN MARIETTA MATLS COM 573284106 3,093 534 20.87 397 55.29 0.0042
2014-02-13 2013-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,559 0 0.00 256 1.59 0.0029
2013-11-12 2013-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,559 -73 -2.77 251 -4.20 0.0031
2013-08-14 2013-06-30 13F MARTIN MARIETTA MATLS COM 573284106 2,632 2,632 263 0.0040
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.