Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionDnB Asset Management AS
Latest Disclosed Ownership14,446 shares
Latest Disclosed Value $ 8,504,071
DnB Asset Management AS reports 9.50% increase in ownership of MLM / Martin Marietta Materials, Inc.

On May 14, 2026 - DnB Asset Management AS filed a 13F-HR form disclosing ownership of 14,446 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $8,504,071 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 13,193 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 9.50% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F Martin Marietta Materials COM 573284106 14,446 1,253 9.50 8,504 3.53 0.0303
2026-02-05 2025-12-31 13F Martin Marietta Materials COM 573284106 13,193 544 4.30 8,215 3.04 0.0287
2025-11-12 2025-09-30 13F Martin Marietta Materials COM 573284106 12,649 505 4.16 7,972 19.59 0.0298
2025-08-12 2025-06-30 13F Martin Marietta Materials COM 573284106 12,144 240 2.02 6,667 17.13 0.0276
2025-05-15 2025-03-31 13F Martin Marietta Materials common 573284106 11,904 27 0.23 5,692 -7.22 0.0262
2025-02-12 2024-12-31 13F Martin Marietta Materials COM 573284106 11,877 209 1.79 6,134 -2.32 0.0265
2024-11-12 2024-09-30 13F Martin Marietta Materials COM 573284106 11,668 527 4.73 6,280 4.04 0.0284
2024-07-05 2024-06-30 13F Martin Marietta Materials common 573284106 11,141 498 4.68 6,036 -7.62 0.0288
2024-04-12 2024-03-31 13F Martin Marietta Materials common 573284106 10,643 10,643 6,534 0.0341
2024-01-04 2023-12-31 13F Martin Marietta Materials common 573284106 0 -11,710 -100.00 0 -100.00
2023-10-13 2023-09-30 13F Martin Marietta Materials common 573284106 11,710 -1,153 -8.96 4,807 -19.06 0.0287
2023-07-10 2023-06-30 13F/A-1 Martin Marietta Materials common 573284106 12,863 378 3.03 5,939 33.98 0.0341
2023-07-06 2023-06-30 13F Martin Marietta Materials common 573284106 12,863 378 5,939 0.0349
2023-04-20 2023-03-31 13F Martin Marietta Materials common 573284106 12,485 1,040 9.09 4,433 14.58 0.0281
2023-01-12 2022-12-31 13F Martin Marietta Materials common 573284106 11,445 88 0.77 3,868 5.77 0.0273
2022-10-11 2022-09-30 13F Martin Marietta Materials common 573284106 11,357 -2,614 -18.71 3,658 -12.51 0.0282
2022-07-08 2022-06-30 13F Martin Marietta Materials common 573284106 13,971 -72,604 -83.86 4,181 -87.46 0.0294
2022-04-08 2022-03-31 13F Martin Marietta Materials common 573284106 86,575 3,108 3.72 33,322 -9.37 0.1981
2022-01-12 2021-12-31 13F Martin Marietta Materials common 573284106 83,467 -12,380 -12.92 36,769 12.27 0.2158
2021-10-15 2021-09-30 13F Martin Marietta Materials common 573284106 95,847 -7,984 -7.69 32,749 -10.35 0.2127
2021-07-06 2021-06-30 13F Martin Marietta Materials common 573284106 103,831 -18,237 -14.94 36,529 -10.89 0.2420
2021-04-15 2021-03-31 13F Martin Marietta Materials common 573284106 122,068 34,080 38.73 40,993 64.07 0.2992
2021-01-19 2020-12-31 13F Martin Marietta Materials common 573284106 87,988 77,291 722.55 24,986 892.65 0.2189
2020-10-14 2020-09-30 13F Martin Marietta Materials common 573284106 10,697 10,697 2,518 0.0268
2020-04-17 2020-03-31 13F Martin Marietta Materials common 573284106 0 -12,179 -100.00 0 -100.00
2020-01-13 2019-12-31 13F Martin Marietta Materials common 573284106 12,179 393 3.33 3,406 5.42 0.0335
2019-10-16 2019-09-30 13F Martin Marietta Materials common 573284106 11,786 11,786 3,231 0.0365
2019-07-08 2019-06-30 13F Martin Marietta Materials common 573284106 0 -10,412 -100.00 0 -100.00
2019-04-11 2019-03-31 13F Martin Marietta Materials common 573284106 10,412 -686 -6.18 2,095 9.81 0.0239
2019-01-15 2018-12-31 13F Martin Marietta Materials common 573284106 11,098 11,098 1,907 0.0247
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.