Martin Marietta Materials (MLM): Congress and insider trades
Who in Congress and inside the company traded MLM, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Martin Marietta Materials (MLM) is a listed stock on NYSE.
- 5 members of Congress filed 25 buys and 18 sells of MLM, the latest published 2026-09-10 (10 September 2026).
- Across 10 scored buys, Congress averaged -3.1% against the S&P 500 (SPY) over the 90 days after disclosure, with 40% of them ahead of the index. That result is based on too few months of entries (9) to judge.
- Data as of 2026-09-29 (29 September 2026).
Congress trades in MLM
as of 2026-09-10| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 10 Sep 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 21 | n/a |
| 10 Sep 2026 | April McClain Delaney (D-MD) | sell | 250K–500K | 15 | n/a |
| 7 Sep 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 32 | n/a |
| 7 Sep 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 25 | n/a |
| 4 Aug 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 17 | n/a |
| 4 Aug 2026 | April McClain Delaney (D-MD) | buy | 15K–50K | 10 | n/a |
| 4 Aug 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 14 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 34 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | buy | 15K–50K | 31 | n/a |
| 11 Jun 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 13 | n/a |
| 11 Jun 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 25 | n/a |
| 8 Jun 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 8 | -14.7% |
| 20 May 2026 | Josh Gottheimer (D-NJ) | sell | 15K–50K | 40 | n/a |
| 13 May 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 17 | -8.8% |
| 13 May 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | -8.8% |
| 9 Apr 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 8 | -20.2% |
| 9 Apr 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 15 | n/a |
| 8 Apr 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 28 | -18.7% |
| 12 Mar 2026 | Michael McCaul (R-TX) | sell | 1K–15K | 21 | n/a |
| 12 Mar 2026 | Michael McCaul (R-TX) | sell | 15K–50K | 15 | n/a |
| 6 Jan 2026 | April McClain Delaney (D-MD) | buy | 1K–15K | 34 | -0.6% |
| 15 May 2025 | Ro Khanna (D-CA) | sell | 1K–15K | 19 | n/a |
| 26 Jul 2023 | Dan Sullivan (R-AK) | sell | 1K–15K | 238 | n/a |
| 7 Dec 2022 | Ro Khanna (D-CA) | sell | 15K–50K | 33 | n/a |
| 17 Nov 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 21 | n/a |
| 17 Nov 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 21 | n/a |
| 12 Oct 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 8 | +4.6% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 22 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 24 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 10 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 24 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 21 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 21 | +7.0% |
| 11 Jul 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 22 | +7.0% |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 15K–50K | 18 | +1.8% |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 17 | +1.8% |
| 12 May 2022 | Ro Khanna (D-CA) | sell | 50K–100K | 25 | n/a |
| 9 Feb 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 28 | n/a |
| 9 Feb 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 18 | -4.4% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 29 | +23.0% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 50K–100K | 29 | +23.0% |
| 14 Aug 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 42 | n/a |
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Related pages
Frequently asked questions
Who has bought MLM?
25 Congress buys by 5 members and 0 insider buys are on file. The tables on this page list every one.
Did buying MLM after a disclosure beat the market?
Across 10 scored buys, Congress averaged -3.1% against the S&P 500 (SPY) over the 90 days after disclosure, with 40% of them ahead of the index. That result is based on too few months of entries (9) to judge. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.