COLB
Columbia Banking System, Inc.Company with tickers: COLB
CIK
887343
CUSIP
197236102
Shares Outstanding
289,490,366
13F Activity (30d)
298 filings
275 filers
Weekly off-exchange (dark pool / OTC) trading volume reported to FINRA under its OTC/ATS Transparency data. ATS volume is executed on alternating trading systems (dark pools); non-ATS OTC is other over-the-counter dealer volume. The off-exchange share is total off-exchange volume as a percentage of consolidated weekly trading volume for the same Monday–Friday week.
Off-Exchange Volume History
| Week Start | ATS Volume | Non-ATS OTC Volume | Total Off-Exchange | % of FINRA Weekly Volume |
|---|---|---|---|---|
| 2026-05-18 | 2,142,116 | 1,011,964 | 3,154,080 | 30.7% |
| 2026-05-11 | 3,281,403 | 3,565,578 | 6,846,981 | 48.1% |
| 2026-05-04 | 2,800,129 | 1,587,330 | 4,387,459 | 36.0% |
| 2026-04-27 | 2,334,778 | 1,387,505 | 3,722,283 | 42.0% |
| 2026-04-20 | 2,773,154 | 1,294,581 | 4,067,735 | 34.5% |
| 2026-04-13 | 2,157,743 | 2,056,948 | 4,214,691 | 42.4% |
| 2026-04-06 | 3,749,681 | 2,404,132 | 6,153,813 | 38.5% |
| 2026-03-30 | 2,873,215 | 1,103,540 | 3,976,755 | 33.5% |
| 2026-03-23 | 2,924,057 | 1,514,470 | 4,438,527 | 35.1% |
| 2026-03-16 | 2,695,115 | 3,172,551 | 5,867,666 | 30.3% |
Showing 1–10 of 10 weeks