Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MLM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.7M | $2.76B | +4.5% | 7.769% | 0.05% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 3.9M | $2.31B | β | 6.495% | 0.06% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.2M | $1.86B | β | 5.240% | 0.10% |
| 4 | STATE STREET CORP | 2.9M | $1.69B | +3.8% | 4.771% | 0.06% |
| 5 | FMR LLC | 2.6M | $1.54B | -10.7% | 4.324% | 0.08% |
| 6 | BANK OF AMERICA CORP /DE/ | 2.4M | $1.41B | +0.9% | 3.979% | 0.10% |
| 7 | PRINCIPAL FINANCIAL GROUP INC | 2.1M | $1.23B | -3.5% | 3.472% | 0.66% |
| 8 | Aristotle Capital Management, LLC | 2.0M | $1.15B | -4.6% | 3.242% | 2.41% |
| 9 | VICTORY CAPITAL MANAGEMENT INC | 1.6M | $963.8M | -33.1% | 2.714% | 0.62% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.6M | $931.8M | +2.3% | 2.635% | 0.06% |
| 11 | MORGAN STANLEY | 1.3M | $789.8M | -1.9% | 2.224% | 0.05% |
| 12 | BAILLIE GIFFORD & CO | 1.1M | $640.1M | -6.2% | 1.803% | 0.65% |
| 13 | Select Equity Group, L.P. | 1.0M | $608.4M | -3.2% | 1.714% | 3.34% |
| 14 | GOLDMAN SACHS GROUP INC | 886K | $521.5M | +11.8% | 1.469% | 0.06% |
| 15 | ALKEON CAPITAL MANAGEMENT LLC | 747K | $440.0M | 0.0% | 1.239% | 2.70% |
| 16 | GARDNER RUSSO & QUINN LLC | 715K | $421.1M | -1.5% | 1.186% | 4.96% |
| 17 | Invesco Ltd. | 691K | $406.7M | -10.3% | 1.146% | 0.06% |
| 18 | KING LUTHER CAPITAL MANAGEMENT CORP | 667K | $392.5M | -3.4% | 1.106% | 1.70% |
| 19 | NORTHERN TRUST CORP | 587K | $345.3M | -2.2% | 0.972% | 0.05% |
| 20 | DIMENSIONAL FUND ADVISORS LP | 546K | $321.4M | +1.1% | 0.906% | 0.07% |
| 21 | FRANKLIN RESOURCES INC | 528K | $310.9M | +6.0% | 0.876% | 0.08% |
| 22 | CIBC Bancorp USA Inc. | 475K | $279.4M | β | 0.787% | 0.38% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 461K | $271.1M | +2.6% | 0.764% | 0.04% |
| 24 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 448K | $263.7M | +6.2% | 0.743% | 0.36% |
| 25 | Bank of New York Mellon Corp | 371K | $218.4M | +0.0% | 0.615% | 0.04% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in MLM β a direct measure of their conviction.
Filings activity in MLM during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new MLM position in Q1 2026
Institutions that fully closed their MLM position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,055 | 3.5% | 89.56% | 12.64 pp | $31.19B | 12% |
| Q4 2025 | 1,093 | +6.8% | 102.20% | 0.06 pp | $35.59B | 0.1% |
| Q3 2025 | 1,023 | +4.0% | 102.26% | +6.16 pp | $35.61B | +6.4% |
| Q2 2025 | 984 | +6.3% | 96.10% | +19.05 pp | $33.46B | +25% |
| Q1 2025 | 926 | 3.7% | 77.05% | 4.17 pp | $26.83B | 5.1% |
| Q4 2024 | 962 | +5.1% | 81.22% | 2.29 pp | $28.28B | 2.7% |
| Q3 2024 | 915 | +0.9% | 83.51% | 38.61 pp | $29.08B | 32% |
| Q2 2024 | 907 | β | 122.12% | β | $42.52B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MLM stock.
Based on Q1 2026 13F filings, institutional ownership of Martin Marietta Materials, Inc. stands at 89.6%, held across 1,055 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of MLM, with approximately 4,685,757 shares worth $2.76B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of MLM.
Our composite Smart Money Score for MLM is 17 out of 100 (Heavy Distribution). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
113 institutions opened new positions in MLM during Q1 2026, while 151 fully exited. 208 added to existing positions and 729 trimmed.
MLM institutional ownership fell by 12.64 percentage points quarter-over-quarter, with a net change of -38 holders.
The top 10 institutions account for 50.8% of all reported 13F value in MLM, and the top 25 account for 70.8%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Martin Marietta Materials, Inc. (MLM) Institutional Ownership