Martin Marietta Materials, Inc.
MX ˙ BMV ˙ US5732841060
SecurityMX:MLM / Martin Marietta Materials, Inc.
InstitutionAlkeon Capital Management Llc
Latest Disclosed Ownership747,351 shares
Latest Disclosed Value $ 439,950,586
Alkeon Capital Management Llc ownership in MLM / Martin Marietta Materials, Inc.

On May 14, 2026 - Alkeon Capital Management Llc filed a 13F-HR form disclosing ownership of 747,351 shares of Martin Marietta Materials, Inc. (MX:MLM) valued at $439,950,586 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 747,351 shares of Martin Marietta Materials, Inc.. This represents a change in shares of 0.00% 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)
2026-05-14 2026-03-31 13F MARTIN MARIETTA MATLS COM 573284106 747,351 0 0.00 439,951 -5.46 0.2496
2026-02-13 2025-12-31 13F MARTIN MARIETTA MATLS COM 573284106 747,351 0 0.00 465,346 -1.21 0.7371
2025-11-14 2025-09-30 13F MARTIN MARIETTA MATLS COM 573284106 747,351 -55,000 -6.85 471,040 6.94 0.6930
2025-08-14 2025-06-30 13F MARTIN MARIETTA MATLS COM 573284106 802,351 32,000 4.15 440,459 19.58 0.7343
2025-05-15 2025-03-31 13F MARTIN MARIETTA MATLS COM 573284106 770,351 -847 -0.11 368,328 -7.53 0.7674
2025-02-14 2024-12-31 13F MARTIN MARIETTA MATLS COM 573284106 771,198 245,000 46.56 398,324 40.64 0.8104
2024-11-14 2024-09-30 13F MARTIN MARIETTA MATLS COM 573284106 526,198 -471 -0.09 283,226 -0.74 0.4854
2024-08-14 2024-06-30 13F MARTIN MARIETTA MATLS COM 573284106 526,669 45,000 9.34 285,349 -3.51 0.4679
2024-05-15 2024-03-31 13F MARTIN MARIETTA MATLS COM 573284106 481,669 92,000 23.61 295,716 52.11 0.5075
2024-02-14 2023-12-31 13F MARTIN MARIETTA MATLS COM 573284106 389,669 29,560 8.21 194,410 31.52 0.4340
2023-11-14 2023-09-30 13F MARTIN MARIETTA MATLS COM 573284106 360,109 -11,078 -2.98 147,818 -13.75 0.2644
2023-08-14 2023-06-30 13F MARTIN MARIETTA MATLS COM 573284106 371,187 64,865 21.18 171,373 57.57 0.2998
2023-05-15 2023-03-31 13F MARTIN MARIETTA MATLS COM 573284106 306,322 -53,079 -14.77 108,763 -10.46 0.2395
2023-02-14 2022-12-31 13F MARTIN MARIETTA MATLS COM 573284106 359,401 -55,304 -13.34 121,467 -9.06 0.4688
2022-11-10 2022-09-30 13F MARTIN MARIETTA MATLS COM 573284106 414,705 -49,723 -10.71 133,572 -3.89 0.4319
2022-08-15 2022-06-30 13F MARTIN MARIETTA MATLS COM 573284106 464,428 172,091 58.87 138,976 23.51 0.3741
2022-05-16 2022-03-31 13F MARTIN MARIETTA MATLS COM 573284106 292,337 -7,570 -2.52 112,518 -14.83 0.2254
2022-02-14 2021-12-31 13F MARTIN MARIETTA MATLS COM 573284106 299,907 -369,547 -55.20 132,115 -42.24 0.2447
2021-11-15 2021-09-30 13F MARTIN MARIETTA MATLS COM 573284106 669,454 -2,079 -0.31 228,739 -3.18 0.3861
2021-08-16 2021-06-30 13F MARTIN MARIETTA MATLS COM 573284106 671,533 90,000 15.48 236,252 20.97 0.3488
2021-05-17 2021-03-31 13F MARTIN MARIETTA MATLS COM 573284106 581,533 325,849 127.44 195,291 168.97 0.2903
2021-02-16 2020-12-31 13F/A-1 MARTIN MARIETTA MATLS COM 573284106 255,684 -34,278 -11.82 72,607 6.39 0.1182
2021-02-16 2020-12-31 13F MARTIN MARIETTA MATLS COM 573284106 255,684 72,607 0.1182
2020-11-16 2020-09-30 13F MARTIN MARIETTA MATLS COM 573284106 289,962 -80,111 -21.65 68,245 -10.73 0.1263
2020-08-14 2020-06-30 13F MARTIN MARIETTA MATLS COM 573284106 370,073 -55,000 -12.94 76,446 -4.96 0.1934
2020-05-15 2020-03-31 13F MARTIN MARIETTA MATLS COM 573284106 425,073 0 0.00 80,436 -32.33 0.3434
2020-02-14 2019-12-31 13F MARTIN MARIETTA MATLS COM 573284106 425,073 22,000 5.46 118,867 7.59 0.4427
2019-11-13 2019-09-30 13F MARTIN MARIETTA MATLS COM 573284106 403,073 0 0.00 110,482 19.12 0.3895
2019-08-14 2019-06-30 13F MARTIN MARIETTA MATLS COM 573284106 403,073 125,000 44.95 92,751 65.80 0.3673
2019-05-15 2019-03-31 13F MARTIN MARIETTA MATLS COM 573284106 278,073 -25,120 -8.29 55,943 7.36 0.2790
2019-02-14 2018-12-31 13F MARTIN MARIETTA MATLS COM 573284106 303,193 11,663 4.00 52,109 -1.76 0.3389
2018-11-14 2018-09-30 13F MARTIN MARIETTA MATLS COM 573284106 291,530 29,030 11.06 53,044 -9.52 0.2509
2018-08-14 2018-06-30 13F MARTIN MARIETTA MATLS COM 573284106 262,500 37,500 16.67 58,624 25.69 0.2733
2018-05-15 2018-03-31 13F MARTIN MARIETTA MATLS COM 573284106 225,000 162,500 260.00 46,643 237.63 0.2471
2018-02-15 2017-12-31 13F MARTIN MARIETTA MATLS COM 573284106 62,500 -368,418 -85.50 13,815 -84.45 0.0813
2017-11-14 2017-09-30 13F MARTIN MARIETTA MATLS COM 573284106 430,918 3,000 0.70 88,868 -6.70 0.6570
2017-08-14 2017-06-30 13F MARTIN MARIETTA MATLS COM 573284106 427,918 207,918 94.51 95,246 98.37 0.7676
2017-05-15 2017-03-31 13F MARTIN MARIETTA MATLS COM 573284106 220,000 0 0.00 48,015 -1.48 0.8280
2017-02-14 2016-12-31 13F MARTIN MARIETTA MATLS COM 573284106 220,000 220,000 48,737 0.9610
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.