---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-076591"
form_type: "8-K"
ticker: "IBOC"
cik: "0000315709"
company_name: "INTERNATIONAL BANCSHARES CORP"
filed_at: "2025-08-12T23:59:59+00:00"
generated_at: "2026-05-17T14:57:21.016863+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# IBC amends bylaws to require 3% ownership for derivative suits, adds exclusive forum and jury waiver

## Summary
- Shareholders must now beneficially own at least 3% of IBC's outstanding common stock to institute a derivative proceeding.
- Exclusive forum for internal entity claims: Texas Business Court (Fourth Division), or SD Texas, or Webb County district court.
- Shareholders, directors, and officers waive trial-by-jury rights for internal entity claims and certain other actions.
- Amendments effective August 6, 2025; adopting any shares implies consent to these provisions.
- Other updates: unspecified governance and operational refinements also included.

## SEC filing metadata
- accession: 0001104659-25-076591
- form_type: 8-K
- ticker: IBOC
- cik: 0000315709
- company_name: INTERNATIONAL BANCSHARES CORP
- filed_at: 2025-08-12T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/315709/000110465925076591/0001104659-25-076591-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/315709/000110465925076591/tm2522145d2_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-076591
- JSON: https://secwatch.observer/filing/0001104659-25-076591.json
- Plain text: https://secwatch.observer/filing/0001104659-25-076591.txt

## Key facts
- Governance Changes
  INTERNATIONAL BANCSHARES CORP: Amended bylaws to require 3% beneficial ownership for derivative proceedings, establish exclusive forum in Texas Business Court, and waive jury trial for internal entity claims (effective 2025-08-06).
  - Change: bylaw amendment
  - Effective: 2025-08-06
  source text: Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On August 6, 2025, following the effectiveness of amendments to the Texas Business Organizations Code (“TBOC”), the Board of Directors of International Bancshares Corporation (“IBC”) approved and adopted the Second Amended and Restated By-Laws of IBC (the “By-Laws”) in order to specify 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 provide that the Texas Business Court located in the Fourth Business Court Division or, if such court lacks jurisdiction the United States District Court for the Southern District of Texas, or if such court lacks jurisdiction the state district court of Webb County will be the sole
  evidence_url: https://www.sec.gov/Archives/edgar/data/315709/000110465925076591/0001104659-25-076591-index.htm

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