---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-021869"
form_type: "8-K"
ticker: "PLBC"
cik: "0001168455"
company_name: "PLUMAS BANCORP"
filed_at: "2025-07-02T23:59:59+00:00"
generated_at: "2026-05-18T09:34:59.525323+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Plumas Bancorp completes acquisition of Cornerstone Community Bancorp for ~$61.3M

## Summary
- Each Cornerstone share converted to 0.6608 Plumas shares + $9.75 cash; total consideration ~$61.3M.
- Plumas assumed $12M in subordinated notes (4.75% fixed-to-floating due 2030/2035).
- Ken Robison appointed to Plumas board; Cornerstone CEO Matt Moseley becomes EVP/Market President.
- Combined pro forma assets ~$2.3B, loans ~$1.5B, deposits ~$1.9B (as of 3/31/25).
- Adds four branches in Anderson, Red Bluff, and Redding, California.

## SEC filing metadata
- accession: 0001437749-25-021869
- form_type: 8-K
- ticker: PLBC
- cik: 0001168455
- company_name: PLUMAS BANCORP
- filed_at: 2025-07-02T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.01, 2.03, 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1168455/000143774925021869/0001437749-25-021869-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1168455/000143774925021869/plbc20250701_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-021869
- JSON: https://secwatch.observer/filing/0001437749-25-021869.json
- Plain text: https://secwatch.observer/filing/0001437749-25-021869.txt

## Source-grounded claims
- claim_id: 14e2f86bfc8be7b21676672a1b283ebbe1eb41de
  claim: PLUMAS BANCORP incurred senior notes of $10 million in aggregate principal amount of 4.75% Fixed-to-Floating Rate Subordinated Notes due November 30, 2030 at fixed interest rate of 4.75% for the first five years and thereafter a quarterly maturing November 30, 2030.
  evidence_excerpt: the Company assumed Cornerstone’s obligations with respect to an aggregate principal amount of $12 million of subordinated notes, comprised of (a) $2 million in aggregate principal amount of 4.75% Fixed to Floating Rate Subordinated Notes due November 30, 2035 (the “2035 Notes”) and (b) $10 million in aggregate principal amount of 4.75% Fixed-to-Floating Rate Subordinated Notes due November 30, 2030 (the “2030 Notes”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1168455/000143774925021869/0001437749-25-021869-index.htm
- claim_id: f78c5835177ef4c8fa8bc4e45d49f87625503398
  claim: PLUMAS BANCORP incurred senior notes of $12 million of subordinated notes, comprised of (a) $2 million in aggregate principal amount of 4.75% Fixed to Floating at fixed interest rate of 4.75% for the first ten years and thereafter ... three-mo maturing November 30, 2035.
  evidence_excerpt: the Company assumed Cornerstone’s obligations with respect to an aggregate principal amount of $12 million of subordinated notes, comprised of (a) $2 million in aggregate principal amount of 4.75% Fixed to Floating Rate Subordinated Notes due November 30, 2035 (the “2035 Notes”) and (b) $10 million in aggregate principal amount of 4.75% Fixed-to-Floating Rate Subordinated Notes due November 30, 2030 (the “2030 Notes”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1168455/000143774925021869/0001437749-25-021869-index.htm
- claim_id: 4abbb54191340a4646512ef9cacad82d7c3033dc
  claim: PLUMAS BANCORP completed an acquisition involving Cornerstone Community Bancorp for Each Cornerstone share converted into 0.6608 shares of Plumas common stock and $9.75 cash, plus cash for fractional shares, and termination of options. (closed 2025-07-01).
  evidence_excerpt: the terms of the Merger Agreement, upon the completion of the Merger, each share of Cornerstone common stock outstanding immediately prior was converted into the right to receive 0.6608 shares of common stock of the Company and $9.75 cash, with cash paid in lieu of fractional shares. The total aggregate consideration delivered to holders of Cornerstone common
  evidence_url: https://www.sec.gov/Archives/edgar/data/1168455/000143774925021869/0001437749-25-021869-index.htm

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