secwatch.observer — SEC 8-K summary
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Issuer:     COLUMBIA BANKING SYSTEM, INC. (COLB)
CIK:        0000887343
Form:       8-K
Filed at:   2025-09-02T23:59:59+00:00
Accession:  0001193125-25-193405
Event type: m_and_a
Sentiment:  positive
Materiality: 0.90
Item codes: 2.01, 5.02, 7.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Columbia Banking System completes all-stock acquisition of Pacific Premier Bancorp
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- Each Pacific Premier share converted into 0.9150 share of Columbia common stock; former PPBI shareholders hold ~30% of combined company.
- Combined company has ~$70B assets, ~$50B loans, ~$56B deposits, and >350 branches across 8 western states.
- Three former Pacific Premier directors (Steven Gardner, M. Christian Mitchell, Jaynie Miller Studenmund) join Columbia board; Gardner also enters $2.2M consulting agreement.
- Tom Rice, former Pacific Premier CIO, joins Columbia Bank's executive leadership team as CIO.
- Systems integration expected in Q1 2026; brand transition from Umpqua to Columbia complete as of Sept 1, 2025.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/887343/000119312525193405/0001193125-25-193405-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/887343/000119312525193405/d21865d8k.htm
  HTML page:      https://secwatch.observer/filing/0001193125-25-193405

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer