---
schema_version: "secwatch.filing_event.v1"
accession: "0001621434-25-000119"
form_type: "8-K"
ticker: "BSM"
cik: "0001621434"
company_name: "Black Stone Minerals, L.P."
filed_at: "2025-08-27T23:59:59+00:00"
generated_at: "2026-05-17T09:42:52.230635+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Black Stone Minerals enters voting and standstill agreement with preferred unitholder AP Basileia

## Summary
- AP Basileia holds 14.7M preferred units; agrees to vote with Board on ordinary matters, standstill until Nov 2027.
- BSM agrees not to redeem preferred units during same period (through Nov 27, 2027).
- Standstill caps AP Basileia ownership at below 11% of common units on an as-converted basis.
- Transfers of preferred units require transferee to be bound by agreement, with exceptions for open-market sales of acquired common.

## SEC filing metadata
- accession: 0001621434-25-000119
- form_type: 8-K
- ticker: BSM
- cik: 0001621434
- company_name: Black Stone Minerals, L.P.
- filed_at: 2025-08-27T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 1.01, 3.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1621434/000162143425000119/0001621434-25-000119-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1621434/000162143425000119/bsm-20250822.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001621434-25-000119
- JSON: https://secwatch.observer/filing/0001621434-25-000119.json
- Plain text: https://secwatch.observer/filing/0001621434-25-000119.txt

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