---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-24-013084"
form_type: "8-K"
ticker: "BSM"
cik: "0001621434"
company_name: "Black Stone Minerals, L.P."
filed_at: "2024-03-26T23:59:59+00:00"
generated_at: "2026-06-04T07:53:21.774738+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Black Stone Minerals: director John Longmaid resigns; AJ Longmaid appointed

## Summary
- John Longmaid resigned as director effective March 21, 2024; no disagreement with company.
- AJ Longmaid appointed to Board effective March 25, 2024; expected to join Compensation Committee.
- No family relationships between AJ Longmaid and other directors/executives disclosed.
- AJ Longmaid to receive standard non-employee director compensation as per 2023 proxy.

## SEC filing metadata
- accession: 0001628280-24-013084
- form_type: 8-K
- ticker: BSM
- cik: 0001621434
- company_name: Black Stone Minerals, L.P.
- filed_at: 2024-03-26T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1621434/000162828024013084/0001628280-24-013084-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1621434/000162828024013084/bsm-20240321.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-24-013084
- JSON: https://secwatch.observer/filing/0001628280-24-013084.json
- Plain text: https://secwatch.observer/filing/0001628280-24-013084.txt

## Key facts
- Executive change
  AJ Longmaid was appointed as Director at Black Stone Minerals, L.P..
  - Action: appointed
  - Role: Director
  source text: Effective March 25, 2024, the Board appointed AJ Longmaid to serve as a member of the Board
  evidence_url: https://www.sec.gov/Archives/edgar/data/1621434/000162828024013084/0001628280-24-013084-index.htm
- Executive change
  John Longmaid resigned as Director at Black Stone Minerals, L.P..
  - Action: resigned
  - Role: Director
  source text: John Longmaid notified Black Stone Minerals, L.P. (the “Partnership”) and Black Stone Minerals GP, L.L.C., the Partnership’s general partner (the “General Partner”), of his decision to resign as a director, effective as of the close of business on March 21.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1621434/000162828024013084/0001628280-24-013084-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.