Martin Marietta Materials Inc
Held by 12 tracked managers as of Q2 2026 · CUSIP ⓘCUSIP: A 9-character ID for one specific security - one share class of one company, or one bond. Tickers can change and can mean different things in different countries; a CUSIP always identifies exactly the same security, which is why filings use it. Guide 573284106 · Sector ⓘGICS sectors: The 11-sector system most investors know (Global Industry Classification Standard): Technology, Health Care, Financials and so on. This site assigns each company a GICS-style sector from its SIC code, with a few hand corrections, so sector pages match the names investors expect. Guide
In plain English: 12 of the investors we track own this stock. In the latest quarter, 5 of them bought more of it and 7 sold some or all of theirs (2 bought it for the first time). That tells you what they did last quarter — not what the stock will do next.
Educational and informational only, not personalized investment advice. Based on public filings that may be delayed or contain errors; verify with the original filings. Disclaimer
Managers holding
12
+1 vs last quarter (like-for-like)
Total value held
$1.85B
Across tracked managers
Average weight ⓘOn average, how big this stock is in the portfolios that own it (its share of each manager's reported portfolio value).
0.5%
Of each manager's book
QoQ value ⓘLike-for-like: only managers that filed both quarters are compared, so a manager filing late (or confidentially) does not look like buying or selling. Includes price changes.
-$148.41M
-8.8% vs last quarter
Net shares bought
-198.1K
Est. net flow -$114.23M
Quarter activity
5 bought · 7 sold
2 new · 1 sold out
Tracked capital in this stock
Total value held (area) and number of managers (line). Dips can mean a large holder filed that quarter confidentially (e.g. Norges Bank in Q1/Q3).
Aggregate buying and selling
Net share change reported each quarter
Who owns MLM?
Who added and who trimmed · Q2 2026
Estimated dollar change per manager (change in shares × this quarter's price). Click a bar to open the manager.
Who owns MLM? — Q2 2026
Holders ranked by position size, with each one's quarter-over-quarter change.
Column filters
| # | Manager | Fund | Shares | Value ↓ | % of their portfolio | QoQ | Δ shares | Δ shares % | Est. Δ value ⓘChange in shares × this quarter's price |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Select Equity Group | Select Equity Group | 1.01M | $583.19M | 3.1% | Reduced | -22.2K | -2.1% | -$12.78M |
| 2 | Baillie Gifford | Baillie Gifford & Co | 991.79K | $571.96M | 0.5% | Reduced | -95.6K | -8.8% | -$55.13M |
| 3 | Norges Bank | Norges Bank Investment Management | 557.14K | $321.30M | 0.0% | — | — | — | — |
| 4 | Mawer | Mawer Investment Management | 241.54K | $139.30M | 0.9% | Reduced | -14.1K | -5.5% | -$8.15M |
| 5 | Diamond Hill | Diamond Hill Capital Management | 213.91K | $123.36M | 1.0% | Reduced | -75.2K | -26.0% | -$43.39M |
| 6 | Israel Englander | Millennium Management | 54.13K | $31.22M | 0.0% | Added | +39.3K | +264.2% | +$22.65M |
| 7 | Two Sigma | Two Sigma Investments | 51.43K | $29.66M | 0.0% | Reduced | -42.8K | -45.4% | -$24.67M |
| 8 | Jim Simons | Renaissance Technologies | 31.89K | $18.39M | 0.0% | New | +31.9K | — | +$18.39M |
| 9 | Ken Griffin | Citadel Advisors | 25.90K | $14.93M | 0.0% | Added | +9.2K | +54.8% | +$5.29M |
| 10 | Fred Alger | Fred Alger Management | 22.50K | $12.98M | 0.0% | Reduced | -29.8K | -57.0% | -$17.17M |
| 11 | Jeremy Grantham | GMO | 9.52K | $5.49M | 0.0% | Added | +232 | +2.5% | +$133.80K |
| 12 | David Shaw | D.E. Shaw & Co. | 1.43K | $824.68K | 0.0% | New | +1.4K | — | +$824.68K |
Column filters
| Manager | Fund | Shares sold | Value last quarter ↓ |
|---|---|---|---|
| Ken Fisher | Fisher Asset Management | -368 | $216.84K |
Politician trades
Column filters
| Politician | Date | Ticker | Asset | Type | Reported range ⓘThe dollar range the politician reported. Exact amounts are not disclosed. | Est. size ⓘOur estimate only: the midpoint of the reported range. | Owner | Account ⓘSubholding Of: the account the trade was in, as named on the report (e.g. an IRA or a brokerage account). The same stock bought on the same day in different accounts is a separate trade in each account. | Filed ↓ | Filing delay ⓘDays between the trade and the report. Over 45 days is late under the STOCK Act. | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ro Khanna Politician | Sep 12, 2026 | MLM | MARTIN MARIETTA MATERIALS INC CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Oct 7, 2026 | 25 days | PTR ↗ |
| April McClain Delaney Politician | Aug 25, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Sale | $250,001 - $500,000 | Est. $375,000 (midpoint of reported range $250,001–$500,000) | Child | — | Sep 9, 2026 | 15 days | PTR ↗ |
| April McClain Delaney Politician | Aug 19, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Sep 9, 2026 | 21 days | PTR ↗ |
| Ro Khanna Politician | Aug 10, 2026 | MLM | MARTIN MARIETTA MATERIALS CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Sep 4, 2026 | 25 days | PTR ↗ |
| Ro Khanna Politician | Aug 3, 2026 | MLM | MARTIN Iv ARIETTA MATERIALS INC CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Sep 4, 2026 | 32 days | PTR ↗ |
| April McClain Delaney Politician | Jul 24, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $15,001 - $50,000 | Est. $32,500 (midpoint of reported range $15,001–$50,000) | Child | — | Aug 3, 2026 | 10 days | PTR ↗ |
| April McClain Delaney Politician | Jul 20, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Aug 3, 2026 | 14 days | PTR ↗ |
| April McClain Delaney Politician | Jul 17, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Aug 3, 2026 | 17 days | PTR ↗ |
| Ro Khanna Politician | Jun 5, 2026 | MLM | MARTIN MARIETTA MATERIALS,INC CMN scanned | Purchase | — | — | — | — | Jul 6, 2026 | 31 days | PTR ↗ |
| Ro Khanna Politician | Jun 2, 2026 | MLM | MARTIN MARIETTA MATERIALS, INC CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Jul 6, 2026 | 34 days | PTR ↗ |
| Ro Khanna Politician | May 15, 2026 | MLM | MARTIN MARIETTA MATERIALS,INC cMN : scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Jun 9, 2026 | 25 days | PTR ↗ |
| Ro Khanna Politician | May 27, 2026 | MLM | MARTIN MARIETTA MATERIALS,INC CMN scanned | Sale (partial) | — | — | Spouse | — | Jun 9, 2026 | 13 days | PTR ↗ |
| April McClain Delaney Politician | May 28, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Jun 5, 2026 | 8 days | PTR ↗ |
| Josh Gottheimer Politician | Apr 9, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Sale | $15,001 - $50,000 | Est. $32,500 (midpoint of reported range $15,001–$50,000) | Joint | Morgan Stanley - Active Asset Account # 3 | May 19, 2026 | 40 days | PTR ↗ |
| Ro Khanna Politician | Apr 13, 2026 | MLM | sp MARTIN MARIETTA MATERIALS, INC CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | May 11, 2026 | 28 days | PTR ↗ |
| Ro Khanna Politician | Apr 24, 2026 | MLM | INC sp MARTIN MARIETTA MATERIALS, CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | May 11, 2026 | 17 days | PTR ↗ |
| April McClain Delaney Politician | Mar 9, 2026 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Apr 6, 2026 | 28 days | PTR ↗ |
| Michael T. McCaul Politician | Feb 17, 2026 | MLM | MARTIN MARIETTA MATERIALS INC scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Mar 10, 2026 | 21 days | PTR ↗ |
| Michael T. McCaul Politician | Feb 23, 2026 | MLM | MARTIN MARIETTA MATERIALS INC scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Mar 10, 2026 | 15 days | PTR ↗ |
| Ro Khanna Politician | Jan 22, 2026 | MLM | MARTIN MARIETTA MATERIALS,INC CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Feb 6, 2026 | 15 days | PTR ↗ |
| Ro Khanna Politician | Jan 29, 2026 | MLM | MARTIN MARIETTA MATERIALS,INC CM scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2026 | 8 days | PTR ↗ |
| April McClain Delaney Politician | Dec 2, 2025 | MLM | Martin Marietta Materials, Inc. Common Stock (MLM) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Jan 5, 2026 | 34 days | PTR ↗ |
| Ro Khanna Politician | Nov 3, 2025 | MLM | MARTIN MARIETTA MATERIALS,INC CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Dec 8, 2025 | 35 days | PTR ↗ |
| Michael T. McCaul Politician | Oct 27, 2025 | MLM | MARTIN MARIETTA MATERIALS scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Nov 10, 2025 | 14 days | PTR ↗ |
| Ro Khanna Politician | Oct 28, 2025 | MLM | INC MARTIN MARIETTA MATERIALS, CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Nov 6, 2025 | 9 days | PTR ↗ |