Columbia Banking System, Inc.
Columbia Banking System, Inc. (COLB) Stock Splits
Forward and reverse split history, cumulative multiple, latest ratio, and share calculator on this tab.
FMP · COLB · as of Jun 8, 2026
Key split metrics
Latest Split Event
Forward SplitStock Split History
| Date↓ | Ratio | Type | Multiple↕ | Cumulative↕ |
|---|---|---|---|---|
| May 10, 2004 | 21-for-20 | Forward | ×1.05 | ×2.32 |
| Apr 12, 2002 | 21-for-20 | Forward | ×1.05 | ×2.21 |
| May 24, 2001 | 11-for-10 | Forward | ×1.10 | ×2.10 |
| May 8, 2000 | 11-for-10 | Forward | ×1.10 | ×1.91 |
| May 10, 1999 | 21-for-20 | Forward | ×1.05 | ×1.74 |
| May 21, 1998 | 3-for-2 | Forward | ×1.50 | ×1.65 |
| May 6, 1997 | 21-for-20 | Forward | ×1.05 | ×1.10 |
| May 6, 1996 | 21-for-20 | Forward | ×1.05 | ×1.05 |
Stock Split Calculator
If you bought 100 shares purchased of COLB on Jan 1, 2020 — — how many shares would you hold today after all splits?
This calculator shows how stock splits affected share count only. It does not reflect current market value, dividend payments, or transaction costs. Past splits do not guarantee future performance.
About stock split history & investor guide
Columbia Banking System, Inc. (COLB) has split its stock 8 times since its IPO, with a cumulative multiplier of ×2.32. The most recent split was a 21-for-20 forward split on May 10, 2004.
Frequently asked questions
Columbia Banking System, Inc. (COLB) has split its stock 8 times. All splits were forward splits. The cumulative multiplier is ×2.32, meaning 1 share at IPO would equal 2.32 shares today.