Updated Jul 16, 2026 · Last SEC filing 2026-07-02
Black Stone Minerals, L.P. (BSM) has filed 11 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-02. 2 Form 8-K material event filings were reported by BSM in the last 90 days. 2 Form 144 notices of proposed sale were filed for BSM stock. InsiderAlpha tracks every BSM SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Crude Petroleum & Natural Gas (SIC 1311) |
|---|---|
| SEC CIK | 0001621434 |
| Form 4 filings (90d) | 11 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 2 |
| Latest Form 4 filing | 2026-07-02 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Kyle Jerry V. Jr. | Director | A — Grant or award | 1.3K | $13.97 | $19K | SEC | |
| DeWalch D Mark | Director | A — Grant or award | 1.3K | $13.97 | $19K | SEC | |
| Stuart Alexander D. | Director | A — Grant or award | 1.7K | $13.97 | $24K | SEC | |
| Hamman Anne Lenoir | Director | A — Grant or award | 1.3K | $13.97 | $19K | SEC | |
| Randall William E. | Director | A — Grant or award | 1.6K | $13.97 | $22K | SEC | |
| DeWalch D Mark | Director | P — Open-market purchase | 36.4K | $13.62 | $495K | SEC | |
| DeWalch D Mark | Director | P — Open-market purchase | 36.4K | $13.48 | $490K | SEC | |
| DeWalch D Mark | Director | P — Open-market purchase | 37.6K | $13.21 | $497K | SEC | |
| Carter Thomas L Jr | Executive Chairman | P — Open-market purchase | 1.1K | $13.50 | $15K | SEC | |
| Longmaid Ashley J | Director | S — Open-market sale | 11.1K | $13.45 | $150K | SEC | |
| Carter Thomas L Jr | Executive Chairman | P — Open-market purchase | 19.2K | $13.48 | $258K | SEC | |
| Carter Thomas L Jr | Executive Chairman | P — Open-market purchase | 25.0K | $13.47 | $337K | SEC | |
| Carter Thomas L Jr | Executive Chairman | P — Open-market purchase | 23.6K | $13.32 | $314K | SEC | |
| Putman Luke Stevens | SVP, General Counsel, and Sec | S — Open-market sale | 29.4K | $14.45 | $425K | SEC | |
| Putman Luke Stevens | SVP, General Counsel, and Sec | S — Open-market sale | 29.4K | $14.45 | $425K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Black Stone Minerals, L.P. (BSM). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Carter Thomas L Jr | 4 | $924K |
| DeWalch D Mark | 4 | $1.50M |
| Randall William E. | 1 | $22K |
| Longmaid Ashley J | 1 | $150K |
| Putman Luke Stevens | 1 | $425K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in BSM insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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