---
schema_version: "secwatch.filing_event.v1"
accession: "0000356171-23-000006"
form_type: "8-K"
ticker: "TCBK"
cik: "0000356171"
company_name: "TRICO BANCSHARES /"
filed_at: "2023-02-14T23:59:59+00:00"
generated_at: "2026-06-19T14:46:43.124060+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# TriCo Bancshares discloses cybersecurity incident; internal systems taken offline

## Summary
- Detected unusual activity and shut down networked systems on Feb 14.
- Internal email, telephones, and customer call center offline; branches open.
- Customer accounts on separate system; no evidence of account access.
- Investigation ongoing; most business services operating normally.
- Tri Counties Bank ATMs unavailable; other ATM transactions normal.

## SEC filing metadata
- accession: 0000356171-23-000006
- form_type: 8-K
- ticker: TCBK
- cik: 0000356171
- company_name: TRICO BANCSHARES /
- filed_at: 2023-02-14T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/356171/000035617123000006/0000356171-23-000006-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/356171/000035617123000006/tcbk-20230214.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000356171-23-000006
- JSON: https://secwatch.observer/filing/0000356171-23-000006.json
- Plain text: https://secwatch.observer/filing/0000356171-23-000006.txt

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