---
schema_version: "secwatch.filing_event.v1"
accession: "0000356171-23-000053"
form_type: "8-K"
ticker: "TCBK"
cik: "0000356171"
company_name: "TRICO BANCSHARES /"
filed_at: "2023-10-13T23:59:59+00:00"
generated_at: "2026-06-10T00:18:17.677609+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# TriCo Bancshares reveals data breach affecting customers and employees; review completed Oct 9

## Summary
- Unauthorized actor accessed systems Feb 7-8, 2023; data review completed Oct 9, 2023.
- Exposed data includes SSN, DL, financial account info, medical info, access credentials.
- Core banking, accounts, online banking not affected; no evidence of identity theft or fraud.
- Offering 24 months of Experian IdentityWorks credit monitoring at no cost to affected individuals.
- Company has incurred expenses; faces risks of litigation, customer behavior change, and regulatory scrutiny.

## SEC filing metadata
- accession: 0000356171-23-000053
- form_type: 8-K
- ticker: TCBK
- cik: 0000356171
- company_name: TRICO BANCSHARES /
- filed_at: 2023-10-13T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/356171/000035617123000053/0000356171-23-000053-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/356171/000035617123000053/tcbk-20231012.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000356171-23-000053
- JSON: https://secwatch.observer/filing/0000356171-23-000053.json
- Plain text: https://secwatch.observer/filing/0000356171-23-000053.txt

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