Black Stone Minerals LP (BSM): Congress and insider trades
Who in Congress and inside the company traded BSM, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Black Stone Minerals LP (BSM) is a listed stock on NYSE.
- 1 member of Congress filed 2 buys and 0 sells of BSM, the latest published 2023-03-01 (1 March 2023).
- Insiders filed 3 open market buys worth $1.5M and 3 sells worth $29M, the latest filed 2026-08-10 (10 August 2026).
- Across 2 scored buys, Congress averaged -2.8% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to draw a conclusion.
- Across 2 scored buys, Insiders averaged +9.3% against the S&P 500 (SPY) over the 90 days after disclosure, with 100% of them ahead of the index. That result is too few trades to draw a conclusion.
- Data as of 2026-09-29 (29 September 2026).
Congress trades in BSM
as of 2023-03-01| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 1 Mar 2023 | Tom Carper (D-DE) | buy | 1Kâ15K | 8 | -5.0% |
| 2 Feb 2023 | Tom Carper (D-DE) | buy | 1Kâ15K | 22 | -0.7% |
Nothing matches that search.
Insider trades in BSM
as of 2026-08-10| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 10 Aug 2026 | Whitehead James | sell | 2,127,105 | $13.21 | $28M | n/a |
| 2 Jun 2026 | DeWalch D Mark | buy | 36,363 | $13.48 | $490K | +8.2% |
| 2 Jun 2026 | DeWalch D Mark | buy | 36,363 | $13.62 | $495K | +8.2% |
| 28 May 2026 | DeWalch D Mark | buy | 37,650 | $13.21 | $497K | +10.4% |
| 6 May 2026 | Putman Luke Stevens | sell | 29,386 | $13.75 | $404K | n/a |
| 7 Apr 2026 | Putman Luke Stevens | sell | 29,386 | $14.45 | $425K | n/a |
Nothing matches that search.
Related pages
Frequently asked questions
Who has bought BSM?
2 Congress buys by 1 member and 3 insider buys are on file. The tables on this page list every one.
Did buying BSM after a disclosure beat the market?
Across 2 scored buys, Congress averaged -2.8% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to draw a conclusion. Across 2 scored buys, Insiders averaged +9.3% against the S&P 500 (SPY) over the 90 days after disclosure, with 100% of them ahead of the index. That result is too few trades to draw a conclusion. 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.