Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionCIBC Asset Management Inc
Latest Disclosed Ownership22,555 shares
Latest Disclosed Value $ 13,277,677
CIBC Asset Management Inc reports 2.37% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 12, 2026 - CIBC Asset Management Inc filed a 13F-HR form disclosing ownership of 22,555 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $13,277,677 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 22,033 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 2.37% 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 22,555 522 2.37 13,278 -3.22 0.0324
2026-02-10 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 22,033 5,839 36.06 13,719 34.42 0.0331
2025-10-31 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 16,194 -2,669 -14.15 10,207 -1.44 0.0296
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 18,863 -665 -3.41 10,355 10.91 0.0320
2025-05-13 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 19,528 2,504 14.71 9,337 6.19 0.0310
2025-01-31 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 17,024 -460 -2.63 8,793 -6.57 0.0288
2024-11-06 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,484 757 4.53 9,411 3.84 0.0305
2024-08-01 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16,727 -1,783 -9.63 9,063 -20.26 0.0322
2024-05-09 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 18,510 496 2.75 11,364 26.45 0.0394
2024-02-13 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 18,014 -738 -3.94 8,987 16.76 0.0336
2023-10-30 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 18,752 -2,009 -9.68 7,697 -19.70 0.0319
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 20,761 -28 -0.13 9,585 29.86 0.0368
2023-05-12 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 20,789 311 1.52 7,381 6.66 0.0293
2023-02-13 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 20,478 3,056 17.54 6,921 23.33 0.0291
2022-11-03 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 17,422 680 4.06 5,611 12.00 0.0246
2022-08-09 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 16,742 1,587 10.47 5,010 -14.11 0.0203
2022-05-06 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 15,155 427 2.90 5,833 -10.10 0.0205
2022-02-08 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 14,728 793 5.69 6,488 36.27 0.0237
2021-11-09 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 13,935 1,023 7.92 4,761 4.80 0.0192
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 12,912 7,488 138.05 4,543 149.48 0.0184
2021-05-14 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,424 -65 -1.18 1,821 16.81 0.0077
2021-02-03 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,489 -7 -0.13 1,559 20.48 0.0073
2020-11-05 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 5,496 -3,908 -41.56 1,294 -33.40 0.0066
2020-07-28 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,404 336 3.71 1,943 13.23 0.0114
2020-04-30 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,068 3,193 54.35 1,716 4.44 0.0121
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 5,875 -146 -2.42 1,643 -0.42 0.0093
2019-10-30 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,021 -417 -6.48 1,650 11.41 0.0097
2019-08-05 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 6,438 -1,122 -14.84 1,481 -2.63 0.0089
2019-05-06 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 7,560 -1,172 -13.42 1,521 1.33 0.0094
2019-02-12 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,732 -870 -9.06 1,501 -14.08 0.0110
2018-11-02 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 9,602 -53 -0.55 1,747 -18.97 0.0108
2018-08-09 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,655 -710 -6.85 2,156 0.33 0.0135
2018-04-30 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 10,365 -313 -2.93 2,149 -8.94 0.0140
2018-02-02 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 10,678 188 1.79 2,360 9.11 0.0144
2017-11-06 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 10,490 1,059 11.23 2,163 3.05 0.0135
2017-07-27 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 9,431 27 0.29 2,099 2.29 0.0145
2017-05-12 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 9,404 -2,650 -21.98 2,052 -23.15 0.0141
2017-02-08 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 12,054 -42 -0.35 2,670 23.21 0.0192
2016-10-19 2016-09-30 13F MARTIN MARIETTA MATLS COM 573284106 12,096 1,277 11.80 2,167 4.33 0.0160
2016-08-02 2016-06-30 13F MARTIN MARIETTA MATLS COM 573284106 10,819 -442 -3.93 2,077 15.65 0.0156
2016-05-09 2016-03-31 13F MARTIN MARIETTA MATLS COM 573284106 11,261 2,907 34.80 1,796 57.41 0.0134
2016-02-02 2015-12-31 13F MARTIN MARIETTA MATLS COM 573284106 8,354 780 10.30 1,141 -0.87 0.0094
2015-11-03 2015-09-30 13F MARTIN MARIETTA MATLS COM 573284106 7,574 1,973 35.23 1,151 45.15 0.0092
2015-08-06 2015-06-30 13F MARTIN MARIETTA MATLS COM 573284106 5,601 448 8.69 793 10.14 0.0055
2015-05-08 2015-03-31 13F MARTIN MARIETTA MATLS COM 573284106 5,153 204 4.12 720 31.87 0.0051
2015-02-10 2014-12-31 13F MARTIN MARIETTA MATLS COM 573284106 4,949 -1,392 -21.95 546 -33.25 0.0036
2014-11-05 2014-09-30 13F MARTIN MARIETTA MATLS COM 573284106 6,341 6,341 818 0.0049
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.