---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-059135"
form_type: "8-K"
ticker: "IBOC"
cik: "0000315709"
company_name: "INTERNATIONAL BANCSHARES CORP"
filed_at: "2026-05-12T15:01:07+00:00"
generated_at: "2026-05-12T15:02:30.265239+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# International Bancshares amends bylaws to remove 3% derivative standing, exclusive forum, jury waiver

## Summary
- Removed requirement that shareholders must beneficially own 3% of stock to bring derivative proceedings.
- Eliminated exclusive forum clause that designated Texas Business Court as sole venue for claims.
- Removed mandatory jury trial waiver for internal entity claims against IBC.
- Amendments adopted by Board and effective May 12, 2026.

## SEC filing metadata
- accession: 0001104659-26-059135
- form_type: 8-K
- ticker: IBOC
- cik: 0000315709
- company_name: INTERNATIONAL BANCSHARES CORP
- filed_at: 2026-05-12T15:01:07+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/315709/000110465926059135/0001104659-26-059135-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/315709/000110465926059135/tm2614341d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-059135
- JSON: https://secwatch.observer/filing/0001104659-26-059135.json
- Plain text: https://secwatch.observer/filing/0001104659-26-059135.txt

## Key facts
- Governance Changes
  INTERNATIONAL BANCSHARES CORP: Removed 3% beneficial ownership threshold for derivative proceedings, eliminated exclusive forum clause, and removed jury trial waiver requirement (effective 2026-05-12).
  - Change: bylaw amendment
  - Effective: 2026-05-12
  source text: Third Amended and Restated By-Laws of IBC (the “By-Laws”) to remove the requirement that a shareholder or group of shareholders may not institute or maintain a derivative proceeding unless that shareholder or group of shareholders beneficially own three percent of IBC’s issued and outstanding common stock, par value $1.00 per share, at the time such derivative proceeding is instituted. In addition, the By-Laws were amended to eliminate the exclusive forum clause
  evidence_url: https://www.sec.gov/Archives/edgar/data/315709/000110465926059135/0001104659-26-059135-index.htm

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