Martin Marietta Materials, Inc.
Martin Marietta Materials, Inc. (MLM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MLM · as of Sep 30, 2025
Ownership Breakdown
1,065
Institutional Holders
▲ 46 vs Q2
$36.66B
Total Inst. Value
▲ $3.91B vs Q2
60.05M
Shares Outstanding
freeFloat 99.24%
58.21M
13F Shares Held
▼ 1.47M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MLM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC mining & quarrying of nonmetallic minerals (no fuels) | 7.44M | 12.28% | 12.28% | $4.69T | Nov 7, 2025 | ▲ 93.6K |
BLACKROCK, INC. mining & quarrying of nonmetallic minerals (no fuels) | 4.15M | 6.85% | 6.85% | $2.62T | Nov 12, 2025 | ▼ 75.8K |
JPMORGAN CHASE & CO mining & quarrying of nonmetallic minerals (no fuels) | 2.93M | 4.84% | 4.84% | $1.85T | Nov 26, 2025 | ▼ 20.4K |
FMR LLC mining & quarrying of nonmetallic minerals (no fuels) | 2.88M | 4.75% | 4.75% | $1.81T | Nov 13, 2025 | ▼ 130.6K |
STATE STREET CORP mining & quarrying of nonmetallic minerals (no fuels) | 2.80M | 4.62% | 4.62% | $1.76T | Nov 14, 2025 | ▼ 28.0K |
BANK OF AMERICA CORP /DE/ mining & quarrying of nonmetallic minerals (no fuels) | 2.37M | 3.90% | 3.90% | $1.49T | Feb 3, 2026 | ▲ 25.2K |
PRINCIPAL FINANCIAL GROUP INC mining & quarrying of nonmetallic minerals (no fuels) | 2.20M | 3.64% | 3.64% | $1.39T | Nov 4, 2025 | ▲ 192.6K |
ARISTOTLE CAPITAL MANAGEMENT, LLC mining & quarrying of nonmetallic minerals (no fuels) | 2.15M | 3.55% | 3.55% | $1.36T | Nov 14, 2025 | ▼ 121.4K |
VICTORY CAPITAL MANAGEMENT INC mining & quarrying of nonmetallic minerals (no fuels) | 1.61M | 2.66% | 2.66% | $1.02T | Nov 12, 2025 | ▼ 31.0K |
GEODE CAPITAL MANAGEMENT, LLC mining & quarrying of nonmetallic minerals (no fuels) | 1.54M | 2.55% | 2.55% | $968.23B | Nov 12, 2025 | ▲ 21.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
12
Increased
+385.5K shares0
New Positions
first time holders37
Decreased
−1.37M shares0
Sold Out
fully exitedNet shares change (top 50)
980.9K
+385.5K / −1.37M
Net new holders
-25
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MLM insider trading · insider activity
Source: SEC Form 4
18
Buy transactions
13
Sell transactions
1.38
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
WAJSGRAS DAVID C director | May 29, 2026 | Award | 69 | $581.64 | $40.1K | 5.0K | Form 4 ↗ |
Pike Thomas director | May 29, 2026 | Award | 59 | $581.64 | $34.3K | 5.0K | Form 4 ↗ |
LYONS MARTIN J director | May 29, 2026 | Award | 61 | $581.64 | $35.5K | 374 | Form 4 ↗ |
WAJSGRAS DAVID C director | May 14, 2026 | Award | 313 | — | — | 5.0K | Form 4 ↗ |
SLAGER DONALD W director | May 14, 2026 | Award | 313 | — | — | 5.1K | Form 4 ↗ |
Pike Thomas director | May 14, 2026 | Award | 313 | — | — | 4.9K | Form 4 ↗ |
PEREZ LAREE E director | May 14, 2026 | Award | 313 | — | — | 15.7K | Form 4 ↗ |
Mack Mary T director | May 14, 2026 | Award | 313 | — | — | 914 | Form 4 ↗ |
LYONS MARTIN J director | May 14, 2026 | Award | 313 | — | — | 313 | Form 4 ↗ |
Foxx Anthony R director | May 14, 2026 | Award | 313 | — | — | 2.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Martin Marietta Materials, Inc. (MLM) is primarily owned by institutional investors, who hold approximately 96.9% of total shares outstanding. Company insiders own approximately 0.76%, while retail and public investors account for the remaining 2.30%.
The largest institutional shareholder of Martin Marietta Materials, Inc. is VANGUARD GROUP INC, holding approximately 7.44 million shares — equal to 12.28% of outstanding shares — as of September 30, 2025.
A total of 1,065 institutional investors currently hold MLM stock, with a combined institutional value of approximately $36.66 billion as of the most recent 13F filing period.
Frequently asked questions
MLM ownershipMartin Marietta Materials, Inc. (MLM) is primarily owned by institutional investors, who hold approximately 96.9% of shares. The largest shareholder is VANGUARD GROUP INC with a 12.28% stake. Company insiders hold 0.76%. Data sourced from SEC Form 13F as of September 30, 2025.