# Martin Marietta Materials (MLM) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 573284106
Page URL: https://superinvestorclub.com/stock/MLM
Last updated: 2026-07-08T13:33:24.543Z

## Summary

As of the most recent 13F filing period, Martin Marietta Materials (MLM) is held by 3 tracked superinvestors with an aggregate position value of $634.6M representing 071541132285739775 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Tom Russo](https://superinvestorclub.com/manager/30) | Gardner Russo & Gardner | 715411 | $421.1M | 4.96% | 2026-03-31 |
| 2 | [Dan Sundheim](https://superinvestorclub.com/manager/303) | D1 Capital Partners | 322857 | $190.1M | 1.69% | 2026-03-31 |
| 3 | [Wallace Weitz](https://superinvestorclub.com/manager/82) | Weitz Investment Management | 39775 | $23.4M | 1.63% | 2026-03-31 |

## Ownership history (quarter-over-quarter)

- 2023-09-30: 2 holders, $419.0M aggregate, 095876362000 shares
- 2023-12-31: 2 holders, $493.9M aggregate, 094056849300 shares
- 2024-03-31: 2 holders, $508.4M aggregate, 078748040675 shares
- 2024-06-30: 2 holders, $436.0M aggregate, 076405940675 shares
- 2024-09-30: 3 holders, $535.8M aggregate, 075007220467440675 shares
- 2024-12-31: 3 holders, $428.7M aggregate, 07070108227640675 shares
- 2025-03-31: 3 holders, $440.3M aggregate, 071425216533841275 shares
- 2025-06-30: 2 holders, $413.9M aggregate, 071277941275 shares
- 2025-09-30: 3 holders, $460.5M aggregate, 0687537412751855 shares
- 2025-12-31: 2 holders, $478.1M aggregate, 072661241275 shares
- 2026-03-31: 3 holders, $634.6M aggregate, 071541132285739775 shares

## Recent congressional trades (24)

- 2025-12-02: April McClain Delaney (Democrat-MD) purchase $1,001 - $15,000
- 2025-11-03: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-10-28: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-10-27: Michael McCaul (Republican-TX) sale $1,001 - $15,000
- 2025-08-21: Michael McCaul (Republican-TX) sale $1,001 - $15,000
- 2025-08-06: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-08-01: April McClain Delaney (Democrat-MD) sale $1,001 - $15,000
- 2025-06-16: Michael McCaul (Republican-TX) sale $1,001 - $15,000
- 2025-06-10: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-04-23: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-03-24: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-03-17: Michael McCaul (Republican-TX) purchase $15,001 - $50,000
- 2025-03-14: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-03-06: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-02-25: Ro Khanna (Democrat-CA) sale $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "Martin Marietta Materials (MLM) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/MLM), aggregating SEC 13F, Form 4, and congressional disclosures."