Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionM&t Bank Corp
Latest Disclosed Ownership11,880 shares
Latest Disclosed Value $ 6,993,519
M&t Bank Corp reports 17.18% decrease in ownership of MLM / Martin Marietta Materials, Inc.

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 11,880 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $6,993,519 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 14,345 shares of Martin Marietta Materials, Inc.. This represents a change in shares of -17.18% 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)
2026-05-12 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,880 -2,465 -17.18 6,994 -21.70 0.0057
2026-01-30 2025-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 14,345 55 0.38 8,932 -0.83 0.0287
2026-01-28 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 72,011 57,721 12,327 0.0073
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 14,290 -2,541 -15.10 9,007 -2.53 0.0303
2025-08-13 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16,831 -541 -3.11 9,240 11.26 0.0317
2025-04-30 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 17,372 -2,465 -12.43 8,305 -18.94 0.0303
2025-02-06 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 19,837 -590 -2.89 10,246 -6.81 0.0343
2024-11-19 2024-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 20,427 -3,376 -14.18 10,994 -14.75 0.0362
2024-11-15 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 20,427 -3,376 10,994 0.0066
2024-07-31 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 23,803 -897 -3.63 12,896 -14.96 0.0440
2024-05-07 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 24,700 -1,060 -4.11 15,164 17.99 0.0528
2024-02-06 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 25,760 -934 -3.50 12,853 17.29 0.0472
2023-11-02 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 26,694 -2,840 -9.62 10,958 -19.64 0.0437
2023-08-09 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 29,534 -1,232 -4.00 13,636 24.83 0.0509
2023-05-11 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 30,766 -1,308 -4.08 10,924 0.77 0.0423
2023-02-13 2022-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 32,074 1,953 6.48 10,840 11.70 0.0436
2023-02-13 2022-12-31 13F MARTEN TRANS COM 573284106 26,281 -3,840 7,787 0.0313
2022-11-17 2022-09-30 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 30,121 -1,558 -4.92 9,704 2.42 0.0431
2022-11-14 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 30,121 -1,558 9,699 0.0083
2022-08-05 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 31,679 3,647 13.01 9,475 -12.18 0.0446
2022-05-09 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 28,032 1,925 7.37 10,789 -6.19 0.0477
2022-02-07 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 26,107 2,021 8.39 11,501 39.73 0.0483
2021-10-28 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 24,086 1,870 8.42 8,231 5.31 0.0371
2021-08-13 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 22,216 1,011 4.77 7,816 9.78 0.0343
2021-05-06 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 21,205 532 2.57 7,120 21.27 0.0307
2021-02-12 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 20,673 1,705 8.99 5,871 31.49 0.0258
2020-11-06 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 18,968 768 4.22 4,465 18.75 0.0219
2020-07-29 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 18,200 2,414 15.29 3,760 25.79 0.0202
2020-05-14 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 15,786 1,708 12.13 2,989 -24.08 0.0177
2020-02-07 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,078 815 6.14 3,937 8.31 0.0185
2019-11-12 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,263 635 5.03 3,635 25.09 0.0181
2019-08-12 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,628 -215 -1.67 2,906 12.46 0.0152
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 12,843 654 5.37 2,584 23.28 0.0135
2019-02-01 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,189 -1,316 -9.74 2,096 -14.73 0.0120
2018-11-09 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,505 6,942 105.77 2,458 67.55 0.0123
2018-08-10 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,563 1,000 17.98 1,467 27.12 0.0079
2018-05-04 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,563 228 4.27 1,154 -2.12 0.0062
2018-02-06 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,335 1,154 27.60 1,179 36.77 0.0062
2017-11-13 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 4,181 92 2.25 862 -5.27 0.0047
2017-08-11 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,089 -339 -7.66 910 -5.80 0.0054
2017-05-10 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,428 -229 -4.92 966 -6.49 0.0058
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,657 -4,623 -49.82 1,033 -37.88 0.0064
2016-11-04 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,280 -638 -6.43 1,663 -12.70 0.0106
2016-08-04 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,918 98 1.00 1,905 21.65 0.0128
2016-05-11 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,820 7,570 336.44 1,566 408.44 0.0106
2016-02-12 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 2,250 -37 -1.62 308 -11.49 0.0020
2015-11-13 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 2,287 -1,937 -45.86 348 -41.81 0.0024
2015-08-14 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 4,224 -450 -9.63 598 -8.42 0.0036
2015-05-14 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 4,674 402 9.41 653 38.64 0.0041
2015-02-12 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,272 685 19.10 471 1.95 0.0029
2014-11-14 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 3,587 3,587 462 0.0032
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.