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% |
| 2026-03-09 | 3,558,728 | 1,960,501 | 5,519,229 | 38.1% |
| 2026-03-02 | 3,019,022 | 2,351,764 | 5,370,786 | 38.0% |
| 2026-02-23 | 3,430,083 | 2,335,760 | 5,765,843 | 33.5% |
| 2026-02-16 | 1,791,839 | 2,475,428 | 4,267,267 | 36.2% |
| 2026-02-09 | 2,269,108 | 2,121,038 | 4,390,146 | 30.7% |
| 2026-02-02 | 3,093,409 | 1,289,766 | 4,383,175 | 29.6% |
| 2026-01-26 | 3,607,610 | 2,349,314 | 5,956,924 | 38.6% |
| 2026-01-19 | 4,162,148 | 3,063,624 | 7,225,772 | 40.9% |
| 2026-01-12 | 1,928,303 | 1,607,178 | 3,535,481 | 36.6% |
| 2026-01-05 | 2,152,061 | 1,578,945 | 3,731,006 | 35.1% |
| 2025-12-29 | 1,430,317 | 908,658 | 2,338,975 | 32.0% |
| 2025-12-22 | 1,319,070 | 806,134 | 2,125,204 | 34.2% |
| 2025-12-15 | 2,621,837 | 1,752,395 | 4,374,232 | 31.4% |
| 2025-12-08 | 2,727,358 | 2,853,658 | 5,581,016 | 37.1% |
| 2025-12-01 | 3,115,125 | 2,481,163 | 5,596,288 | 40.7% |
| 2025-11-24 | 1,456,713 | 1,229,273 | 2,685,986 | 30.9% |
| 2025-11-17 | 2,929,568 | 3,104,435 | 6,034,003 | 36.0% |
| 2025-11-10 | 2,572,914 | 3,741,514 | 6,314,428 | 41.3% |
| 2025-11-03 | 3,248,710 | 4,026,930 | 7,275,640 | 42.1% |
| 2025-10-27 | 5,494,276 | 6,513,916 | 12,008,192 | 41.2% |
| 2025-10-20 | 3,829,366 | 5,814,920 | 9,644,286 | 45.1% |
| 2025-10-13 | 4,661,731 | 11,332,938 | 15,994,669 | 48.3% |
| 2025-10-06 | 4,039,550 | 12,126,931 | 16,166,481 | 57.8% |
| 2025-09-29 | 3,392,797 | 13,015,962 | 16,408,759 | 62.8% |
| 2025-09-22 | 2,875,462 | 10,355,293 | 13,230,755 | 53.5% |
| 2025-09-15 | 5,048,532 | 7,195,923 | 12,244,455 | 37.9% |
| 2025-09-08 | 4,874,399 | 4,250,297 | 9,124,696 | 43.4% |
| 2025-09-01 | 7,363,238 | 6,456,839 | 13,820,077 | 37.7% |
| 2025-08-25 | 5,468,902 | 7,754,332 | 13,223,234 | 35.5% |
| 2025-08-18 | 2,218,602 | 2,089,039 | 4,307,641 | 35.7% |
| 2025-08-11 | 2,807,835 | 2,140,485 | 4,948,320 | 41.4% |
| 2025-08-04 | 2,310,532 | 1,366,738 | 3,677,270 | 34.3% |
| 2025-07-28 | 2,537,752 | 2,120,764 | 4,658,516 | 36.8% |
| 2025-07-21 | 3,488,483 | 2,054,925 | 5,543,408 | 32.9% |
| 2025-07-14 | 2,031,685 | 1,893,320 | 3,925,005 | 36.4% |
| 2025-07-07 | 2,300,910 | 3,094,226 | 5,395,136 | 41.8% |
| 2025-06-30 | 1,943,021 | 3,603,215 | 5,546,236 | 44.1% |
| 2025-06-23 | 1,967,673 | 1,032,445 | 3,000,118 | 30.4% |
| 2025-06-16 | 1,458,708 | 2,823,954 | 4,282,662 | 43.0% |
Showing 1–49 of 49 weeks