Columbia Banking System, Inc.
US ˙ NasdaqGS ˙ US1972361026

SecurityCOLB / Columbia Banking System, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership2,615,067 shares
Latest Disclosed Value $ 71,731,288
Northern Trust Corp reports 2.84% increase in ownership of COLB / Columbia Banking System, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 2,615,067 shares of Columbia Banking System, Inc. (US:COLB) valued at $71,731,288 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,542,957 shares of Columbia Banking System, Inc.. This represents a change in shares of 2.84% during the quarter. The current value of the position is $77,144,476 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F COLUMBIA BKG SYS COM 197236102 2,615,067 72,110 2.84 71,731 0.92 0.0095
2026-02-17 2025-12-31 13F COLUMBIA BKG SYS COM 197236102 2,542,957 -108,940 -4.11 71,076 4.13 0.0091
2025-11-14 2025-09-30 13F COLUMBIA BKG SYS COM 197236102 2,651,897 919,343 53.06 68,260 68.51 0.0087
2025-08-13 2025-06-30 13F COLUMBIA BKG SYS COM 197236102 1,732,554 43,545 2.58 40,507 -3.84 0.0056
2025-05-13 2025-03-31 13F COLUMBIA BKG SYS COM 197236102 1,689,009 -79,464 -4.49 42,124 -11.81 0.0063
2025-02-14 2024-12-31 13F COLUMBIA BKG SYS COM 197236102 1,768,473 329,485 22.90 47,766 27.14 0.0068
2024-11-13 2024-09-30 13F COLUMBIA BKG SYS COM 197236102 1,438,988 -47,026 -3.16 37,572 27.12 0.0062
2024-08-14 2024-06-30 13F COLUMBIA BKG SYS COM 197236102 1,486,014 104,156 7.54 29,557 10.54 0.0050
2024-05-14 2024-03-31 13F COLUMBIA BKG SYS COM 197236102 1,381,858 -237,201 -14.65 26,739 -38.10 0.0046
2024-02-13 2023-12-31 13F COLUMBIA BKG SYS COM 197236102 1,619,059 -153,499 -8.66 43,196 20.05 0.0078
2023-11-13 2023-09-30 13F COLUMBIA BKG SYS COM 197236102 1,772,558 8,945 0.51 35,983 0.60 0.0070
2023-08-11 2023-06-30 13F COLUMBIA BKG SYS COM 197236102 1,763,613 -450,984 -20.36 35,766 -24.60 0.0069
2023-05-15 2023-03-31 13F COLUMBIA BKG SYS COM 197236102 2,214,597 1,171,873 112.39 47,437 50.99 0.0094
2023-02-13 2022-12-31 13F COLUMBIA BKG SYS COM 197236102 1,042,724 8,855 0.86 31,417 5.18 0.0066
2022-11-14 2022-09-30 13F COLUMBIA BKG SYS COM 197236102 1,033,869 3,628 0.35 29,869 1.20 0.0068
2022-08-12 2022-06-30 13F COLUMBIA BKG SYS COM 197236102 1,030,241 2,067 0.20 29,516 -11.04 0.0063
2022-05-13 2022-03-31 13F COLUMBIA BKG SYS COM 197236102 1,028,174 -28,118 -2.66 33,179 -4.00 0.0058
2022-02-08 2021-12-31 13F COLUMBIA BKG SYS COM 197236102 1,056,292 -120,881 -10.27 34,562 -22.72 0.0057
2021-11-15 2021-09-30 13F COLUMBIA BKG SYS COM 197236102 1,177,173 -15,827 -1.33 44,722 -2.78 0.0079
2021-08-13 2021-06-30 13F COLUMBIA BKG SYS COM 197236102 1,193,000 -32,725 -2.67 46,002 -12.90 0.0081
2021-05-12 2021-03-31 13F COLUMBIA BKG SYS COM 197236102 1,225,725 -239,102 -16.32 52,817 0.44 0.0098
2021-02-11 2020-12-31 13F COLUMBIA BKG SYS COM 197236102 1,464,827 -24,801 -1.66 52,587 48.02 0.0102
2020-11-16 2020-09-30 13F COLUMBIA BKG SYS COM 197236102 1,489,628 -4,480 -0.30 35,528 -16.11 0.0078
2020-08-14 2020-06-30 13F COLUMBIA BKG SYS COM 197236102 1,494,108 35,830 2.46 42,350 8.36 0.0100
2020-05-14 2020-03-31 13F COLUMBIA BKG SYS COM 197236102 1,458,278 7,546 0.52 39,082 -33.78 0.0112
2020-02-14 2019-12-31 13F COLUMBIA BKG SYS COM 197236102 1,450,732 -26,168 -1.77 59,022 8.30 0.0132
2019-11-13 2019-09-30 13F COLUMBIA BKG SYS COM 197236102 1,476,900 35,886 2.49 54,497 4.53 0.0130
2019-08-13 2019-06-30 13F COLUMBIA BKG SYS COM 197236102 1,441,014 6,244 0.44 52,137 11.16 0.0124
2019-05-13 2019-03-31 13F COLUMBIA BKG SYS COM 197236102 1,434,770 24,173 1.71 46,902 -8.38 0.0116
2019-02-12 2018-12-31 13F COLUMBIA BKG SYS COM 197236102 1,410,597 13,879 0.99 51,191 -5.47 0.0144
2018-11-14 2018-09-30 13F COLUMBIA BKG SYS COM 197236102 1,396,718 -52,463 -3.62 54,152 -8.64 0.0133
2018-09-18 2018-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 1,449,181 20,630 1.44 59,271 -1.10 0.0151
2018-08-14 2018-06-30 13F COLUMBIA BKG SYS COM 197236102 1,453,882 25,331 59,464
2018-05-09 2018-03-31 13F COLUMBIA BKG SYS COM 197236102 1,428,551 14,930 1.06 59,928 -2.41 0.0156
2018-02-14 2017-12-31 13F COLUMBIA BKG SYS COM 197236102 1,413,621 167,826 13.47 61,408 17.06 0.0156
2017-11-13 2017-09-30 13F COLUMBIA BKG SYS COM 197236102 1,245,795 3,259 0.26 52,460 5.95 0.0137
2017-08-11 2017-06-30 13F COLUMBIA BKG SYS COM 197236102 1,242,536 169,018 15.74 49,515 18.30 0.0138
2017-05-12 2017-03-31 13F COLUMBIA BKG SYS COM 197236102 1,073,518 9,906 0.93 41,856 -11.92 0.0121
2017-02-13 2016-12-31 13F COLUMBIA BKG SYS COM 197236102 1,063,612 -211,593 -16.59 47,522 13.89 0.0146
2016-11-09 2016-09-30 13F COLUMBIA BKG SYS COM 197236102 1,275,205 79,092 6.61 41,726 24.32 0.0130
2016-08-12 2016-06-30 13F COLUMBIA BKG SYS COM 197236102 1,196,113 46,960 4.09 33,563 -3.08 0.0109
2016-08-19 2016-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 1,149,153 -33,958 -2.87 34,630 -9.97 0.0115
2016-05-13 2016-03-31 13F Columbia Bkg Sys COMM 197236102 1,149,149 34,383
2016-02-12 2015-12-31 13F Columbia Bkg Sys COMM 197236102 1,183,111 17,089 1.47 38,463 5.69 0.0128
2015-11-12 2015-09-30 13F Columbia Bkg Sys COMM 197236102 1,166,022 226,607 24.12 36,391 19.05 0.0121
2015-08-13 2015-06-30 13F COLUMBIA BKG SYS COM 197236102 939,415 -152,388 -13.96 30,568 -3.35 0.0207
2015-08-13 2015-06-30 13F Columbia Bkg Sys COMM 019723610 238,555 -853,248 7,763 0.0053
2015-05-14 2015-03-31 13F Columbia Bkg Sys COMM 197236102 1,091,803 19,354 1.80 31,629 6.82 0.0095
2015-02-12 2014-12-31 13F Columbia Bkg Sys COM 197236102 1,072,449 14,505 1.37 29,610 12.81 0.0089
2014-11-13 2014-09-30 13F Columbia Bkg Sys COMM 197236102 1,057,944 162,363 18.13 26,248 11.39 0.0082
2014-08-14 2014-06-30 13F COLUMBIA BKG SYS com 197236102 895,581 -196,217 -17.97 23,563 -24.33 0.0073
2014-05-14 2014-03-31 13F COLUMBIA BKG SYS COMM 197236102 1,091,798 105,152 10.66 31,138 14.80 0.0098
2014-02-21 2013-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 986,646 -73,468 -6.93 27,124 3.59 0.0087
2014-02-12 2013-12-31 13F COLUMBIA BKG SYS COM 197236102 986,646 27,124
2013-11-13 2013-09-30 13F COLUMBIA BKG SYS COM 197236102 1,060,114 32,050 3.12 26,185 6.97 0.0092
2013-08-09 2013-06-30 13F COLUMBIA BKG SYS COM 197236102 1,028,064 1,028,064 24,478 0.0089
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.