MARTIN MARIETTA MATLS INC (MLM): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in MLM · Materials. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
27
13F filers
Aggregate Value
$2.5B
Across holders
Last Price
$533.11
2026-08-24
Sector
Materials
GICS
Quarterly fund activity17 increased10 reduced5 exited
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| TCI Fund Management Ltd CIK 0001647251 | Hedge Fund | 1.32M | $758.4M | 30.6% | 1.4% | Added | — | Q2 2026 |
| Select Equity Group, L.P. CIK 0001592643 | Hedge Fund | 1.01M | $583.2M | 23.5% | 2.9% | Reduced | $-12.8M | Q2 2026 |
| BAILLIE GIFFORD & CO CIK 0001088875 | Institutional Manager | 992K | $572.0M | 23.0% | 0.5% | Reduced | $-265.1M | Q2 2026 |
| D1 Capital Partners L.P. CIK 0001747057 | Hedge Fund | 345K | $199.0M | 8.0% | 0.6% | Added | +$12.8M | Q2 2026 |
| Clearbridge Investments, LLC CIK 0001348883 | Hedge Fund | 191K | $110.1M | 4.4% | 0.1% | Reduced | $-13.7M | Q2 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 67K | $38.6M | 1.6% | 0.0% | Added | +$33.2M | Q2 2026 |
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 54K | $31.2M | 1.3% | 0.0% | Added | +$22.6M | Q2 2026 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 51K | $29.7M | 1.2% | 0.0% | Reduced | $-24.7M | Q2 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 0001164508 | Hedge Fund | 47K | $27.0M | 1.1% | 0.0% | Reduced | $-25.8M | Q2 2026 |
| Gotham Asset Management, LLC CIK 0001510387 | Hedge Fund | 37K | $21.1M | 0.9% | 0.0% | Added | +$8.5M | Q2 2026 |
Added
Hedge Fund
$758.4M· 30.6% of total· 1.4% port· 1.32M sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$583.2M· 23.5% of total· 2.9% port· 1.01M sh· $-12.8M QoQ· Q2 2026
Reduced
Institutional Manager
$572.0M· 23.0% of total· 0.5% port· 992K sh· $-265.1M QoQ· Q2 2026
Added
Hedge Fund
$199.0M· 8.0% of total· 0.6% port· 345K sh· +$12.8M QoQ· Q2 2026
Reduced
Hedge Fund
$110.1M· 4.4% of total· 0.1% port· 191K sh· $-13.7M QoQ· Q2 2026
Added
Hedge Fund
$38.6M· 1.6% of total· 0.0% port· 67K sh· +$33.2M QoQ· Q2 2026
Added
Hedge Fund
$31.2M· 1.3% of total· 0.0% port· 54K sh· +$22.6M QoQ· Q2 2026
Reduced
Hedge Fund
$29.7M· 1.2% of total· 0.0% port· 51K sh· $-24.7M QoQ· Q2 2026
Reduced
Hedge Fund
$27.0M· 1.1% of total· 0.0% port· 47K sh· $-25.8M QoQ· Q2 2026
Added
Hedge Fund
$21.1M· 0.9% of total· 0.0% port· 37K sh· +$8.5M QoQ· Q2 2026
Added
Hedge Fund
$18.4M· 0.7% of total· 0.0% port· 32K sh· — QoQ· Q2 2026
Added
Hedge Fund
$14.9M· 0.6% of total· 0.0% port· 26K sh· $-1.4M QoQ· Q2 2026
Reduced
Hedge Fund
$13.0M· 0.5% of total· 0.0% port· 23K sh· $-17.2M QoQ· Q2 2026
Added
Hedge Fund
$10.7M· 0.4% of total· 0.0% port· 19K sh· — QoQ· Q2 2026
Added
Hedge Fund
$10.1M· 0.4% of total· 0.1% port· 18K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$8.8M· 0.4% of total· 0.0% port· 15K sh· $-27.9M QoQ· Q2 2026
Reduced
Hedge Fund
$7.6M· 0.3% of total· 0.0% port· 13K sh· $-33.3M QoQ· Q2 2026
Added
Hedge Fund
$6.6M· 0.3% of total· 0.0% port· 10K sh· +$2.2M QoQ· Q3 2025
Reduced
Hedge Fund
$6.0M· 0.2% of total· 0.1% port· 10K sh· $-4K QoQ· Q2 2026
Added
Institutional Manager
$5.5M· 0.2% of total· 0.0% port· 10K sh· +$134K QoQ· Q2 2026
Added
Hedge Fund
$2.6M· 0.1% of total· 0.0% port· 5K sh· — QoQ· Q2 2026
Added
Hedge Fund
$1.6M· 0.1% of total· 0.0% port· 3K sh· +$321K QoQ· Q2 2026
Added
Hedge Fund
$1.6M· 0.1% of total· 0.0% port· 3K sh· +$26K QoQ· Q2 2026
Reduced
Hedge Fund
$1.1M· 0.0% of total· 0.0% port· 2K sh· $-26.4M QoQ· Q2 2026
Added
Hedge Fund
$1.1M· 0.0% of total· 0.0% port· 2K sh· +$564K QoQ· Q2 2026
Added
Hedge Fund
$984K· 0.0% of total· 0.1% port· 2K sh· — QoQ· Q2 2026
Added
Hedge Fund
$825K· 0.0% of total· 0.0% port· 1K sh· — QoQ· Q2 2026
1–10 of 27
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