BSM insider buying and SEC filings, explained
Black Stone Minerals, L.P. · CIK 1621434
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- NYSE
- Industry (SIC)
- Crude Petroleum & Natural Gas
- State of incorporation
- DE
- Fiscal year end
- Dec 31
Insider activity in the last 12 months
Bought
$2.4M
Insiders who bought
2
Sold (not marked 10b5-1)
$28.2M
Planned sales (10b5-1)
$1.3M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 6, 2026 | Sale | James Whitehead (Director) sold 2,127,105 shares indirectly at $13.21 ($28.1M). Indirect holdings down 72% to 646,058 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 10, 2026 |
| May 29–Jun 1, 2026 | Purchase (code P) | D Mark DeWalch (Director) bought 72,726 shares indirectly (by entity) between May 29 and Jun 1 at about $13.55 ($985K), reported as a purchase (code P). Holdings by entity up 13% to 631,248 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 2, 2026 |
| May 28, 2026 | Purchase (code P) | D Mark DeWalch (Director) bought 37,650 shares at about $13.21 ($497K), reported as a purchase (code P). Holdings up 10% to 431,495 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 28, 2026 |
| May 13, 2026 | Purchase (code P) | Thomas L Carter Jr (Chair and Director) bought 1,120 shares at about $13.50 ($15K), reported as a purchase (code P). Holdings up <1% to 3,682,724 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 14, 2026 |
| May 12, 2026 | Sale | Ashley J Longmaid (Director) sold 11,128 shares at about $13.45 ($150K). Holdings down 7% to 137,335 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 13, 2026 |
| May 8–12, 2026 | Purchase (code P) | Thomas L Carter Jr (Chair and Director) bought 67,758 shares between May 8 and May 12 at about $13.42 ($909K), reported as a purchase (code P). Holdings up 2% to 3,681,604 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 12, 2026 |
| May 5, 2026 | Planned (10b5-1) | Luke Stevens Putman (SVP, General Counsel, and Sec) sold 29,386 shares at about $13.75 ($404K), marked as a 10b5-1 plan trade. Holdings down 4% to 702,645 shares. | SEC filing Filed May 6, 2026 |
| Apr 6, 2026 | Planned (10b5-1) Amended filing | Luke Stevens Putman (SVP, General Counsel, and Sec) sold 29,386 shares at about $14.45 ($425K), marked as a 10b5-1 plan trade. Holdings down 4% to 732,031 shares. This amends a filing from Apr 7. | SEC filing Filed May 6, 2026 |
| Mar 5, 2026 | Planned (10b5-1) Amended filing | Luke Stevens Putman (SVP, General Counsel, and Sec) sold 30,276 shares at $15.25 ($462K), marked as a 10b5-1 plan trade. Holdings down 4% to 761,417 shares. This amends a filing from Mar 6. | SEC filing Filed May 6, 2026 |
47 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
2 insiders bought in 30 days
$2.4M in purchases since May 12, 2026 · Purchases traded May 12, 2026 to Jun 1, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Thomas L Carter Jr (Chair) | $909K | May 12, 2026 | SEC filing |
| Thomas L Carter Jr (Chair) | $15K | May 13, 2026 | SEC filing |
| D Mark DeWalch (Director) | $497K | May 28, 2026 | SEC filing |
| D Mark DeWalch (Director) | $985K | Jun 1, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
| Filed | Items | Tag | Source |
|---|---|---|---|
| Nov 2, 2026, 5:54 PM ET 8-K | Earnings released (Item 2.02) | SEC filing |
Red flags are objective triggers only: the item or form filed, never an opinion.
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