---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-25-000393"
form_type: "8-K"
ticker: "WABC"
cik: "0000311094"
company_name: "WESTAMERICA BANCORPORATION"
filed_at: "2025-01-23T23:59:59+00:00"
generated_at: "2026-05-27T16:53:32.636869+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Westamerica Bancorporation SVP/Treasurer Thorson retiring; John Sousa appointed

## Summary
- John 'Robert' A. Thorson retires as Senior Vice President and Treasurer, effective January 24, 2025, after 35+ years.
- John Sousa appointed Senior Vice President and Treasurer, effective January 27, 2025.
- Sousa joined Westamerica in July 2024 as VP/Assistant Treasurer; previously 13+ years at Bank of the West.

## SEC filing metadata
- accession: 0001171843-25-000393
- form_type: 8-K
- ticker: WABC
- cik: 0000311094
- company_name: WESTAMERICA BANCORPORATION
- filed_at: 2025-01-23T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/311094/000117184325000393/0001171843-25-000393-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/311094/000117184325000393/f8k_012325.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-25-000393
- JSON: https://secwatch.observer/filing/0001171843-25-000393.json
- Plain text: https://secwatch.observer/filing/0001171843-25-000393.txt

## Key facts
- Executive change
  John “Robert” A. Thorson departed as Senior Vice President and Treasurer at WESTAMERICA BANCORPORATION.
  - Action: retiring
  - Role: Senior Vice President and Treasurer
  source text: Westamerica Bancorporation announces the retirement of John “Robert” A. Thorson, Senior Vice President and Treasurer, effective January 24, 2025, following over 35 years of service.
  evidence_url: https://www.sec.gov/Archives/edgar/data/311094/000117184325000393/0001171843-25-000393-index.htm
- Executive change
  John Sousa was appointed as Senior Vice President and Treasurer at WESTAMERICA BANCORPORATION.
  - Action: appointed
  - Role: Senior Vice President and Treasurer
  source text: Westamerica Bancorporation announces the appointment of John Sousa as Senior Vice President and Treasurer effective January 27, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/311094/000117184325000393/0001171843-25-000393-index.htm

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