Columbia Banking System, Inc.
US ˙ NasdaqGS ˙ US1972361026

SecurityCOLB / Columbia Banking System, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership635,406 shares
Latest Disclosed Value $ 17,759,674
Sei Investments Co reports 2.36% decrease in ownership of COLB / Columbia Banking System, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 635,406 shares of Columbia Banking System, Inc. (US:COLB) valued at $17,759,598 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 650,775 shares of Columbia Banking System, Inc.. This represents a change in shares of -2.36% during the quarter. The current value of the position is $18,744,477 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)
2026-02-13 2025-12-31 13F COLUMBIA BKG SYS COM 197236102 635,406 -15,369 -2.36 17,760 6.02 0.0175
2025-11-13 2025-09-30 13F COLUMBIA BKG SYS COM 197236102 650,775 252,329 63.33 16,751 79.83 0.0180
2025-08-14 2025-06-30 13F COLUMBIA BKG SYS COM 197236102 398,446 -752,540 -65.38 9,316 -67.55 0.0108
2025-05-14 2025-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 1,150,986 61,506 5.65 28,705 -2.45 0.0369
2025-05-13 2025-03-31 13F COLUMBIA BKG SYS COM 197236102 1,100,112 10,632 29,524 0.0321
2025-02-11 2024-12-31 13F COLUMBIA BKG SYS COM 197236102 1,089,480 93,509 9.39 29,427 13.16 0.0378
2024-11-12 2024-09-30 13F COLUMBIA BKG SYS COM 197236102 995,971 3,399 0.34 26,005 31.72 0.0338
2024-08-13 2024-06-30 13F COLUMBIA BKG SYS COM 197236102 992,572 36,995 3.87 19,742 6.77 0.0280
2024-05-07 2024-03-31 13F COLUMBIA BKG SYS COM 197236102 955,577 -93,106 -8.88 18,490 -33.91 0.0271
2024-02-14 2023-12-31 13F COLUMBIA BKG SYS COM 197236102 1,048,683 83,134 8.61 27,979 42.74 0.0449
2023-11-14 2023-09-30 13F COLUMBIA BKG SYS COM 197236102 965,549 89,660 10.24 19,600 10.35 0.0352
2023-08-11 2023-06-30 13F COLUMBIA BKG SYS COM 197236102 875,889 507,566 137.80 17,763 125.15 0.0310
2023-05-12 2023-03-31 13F COLUMBIA BKG SYS COM 197236102 368,323 90,875 32.75 7,890 -5.61 0.0147
2023-02-10 2022-12-31 13F COLUMBIA BKG SYS COM 197236102 277,448 66,749 31.68 8,359 37.31 0.0186
2022-11-14 2022-09-30 13F COLUMBIA BKG SYS COM 197236102 210,699 -1,530 -0.72 6,087 0.18 0.0136
2022-08-15 2022-06-30 13F COLUMBIA BKG SYS COM 197236102 212,229 50,315 31.08 6,076 16.24 0.0131
2022-05-13 2022-03-31 13F COLUMBIA BKG SYS COM 197236102 161,914 -8,540 -5.01 5,227 -6.34 0.0105
2022-02-14 2021-12-31 13F COLUMBIA BKG SYS COM 197236102 170,454 15,609 10.08 5,581 -5.05 0.0105
2021-11-12 2021-09-30 13F COLUMBIA BKG SYS COM 197236102 154,845 -10,647 -6.43 5,878 -7.90 0.0123
2021-08-06 2021-06-30 13F COLUMBIA BKG SYS COM 197236102 165,492 1,949 1.19 6,382 -7.85 0.0142
2021-05-12 2021-03-31 13F COLUMBIA BKG SYS COM 197236102 163,543 48,412 42.05 6,926 67.50 0.0175
2021-02-08 2020-12-31 13F COLUMBIA BKG SYS COM 197236102 115,131 28,154 32.37 4,135 99.37 0.0107
2020-12-04 2020-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 86,977 -8,169 -8.59 2,074 -23.10 0.0060
2020-11-06 2020-09-30 13F COLUMBIA BKG SYS COM 197236102 89,746 -5,400 2,140 5,152.6442
2020-08-17 2020-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 95,146 26,643 38.89 2,697 47.06 0.0084
2020-08-11 2020-06-30 13F COLUMBIA BKG SYS COM 197236102 63,460 -5,043 2,498 6,775.9580
2020-05-14 2020-03-31 13F COLUMBIA BKG SYS COM 197236102 68,503 8,374 13.93 1,834 -25.11 0.0067
2020-02-06 2019-12-31 13F COLUMBIA BKG SYS COM 197236102 60,129 -172,616 -74.17 2,449 -71.49 0.0073
2019-11-12 2019-09-30 13F COLUMBIA BKG SYS COM 197236102 232,745 132,500 132.18 8,591 136.86 0.0220
2019-08-14 2019-06-30 13F COLUMBIA BKG SYS COM 197236102 100,245 -2,880 -2.79 3,627 7.56 0.0118
2019-05-15 2019-03-31 13F COLUMBIA BKG SYS COM 197236102 103,125 7,999 8.41 3,372 -8.47 0.0113
2019-02-13 2018-12-31 13F COLUMBIA BKG SYS COM 197236102 95,126 310 0.33 3,684 0.24 0.0131
2018-11-08 2018-09-30 13F COLUMBIA BKG SYS COM 197236102 94,816 44,278 87.61 3,675 77.79 0.0133
2018-08-03 2018-06-30 13F COLUMBIA BKG SYS COM 197236102 50,538 7,999 18.80 2,067 15.86 0.0070
2018-05-11 2018-03-31 13F COLUMBIA BKG SYS COM 197236102 42,539 19,501 84.65 1,784 78.22 0.0068
2018-02-08 2017-12-31 13F COLUMBIA BKG SYS COM 197236102 23,038 9,968 76.27 1,001 81.67 0.0035
2017-11-06 2017-09-30 13F COLUMBIA BKG SYS COM 197236102 13,070 1,183 9.95 551 16.24 0.0020
2017-07-31 2017-06-30 13F COLUMBIA BKG SYS COM 197236102 11,887 945 8.64 474 11.01 0.0019
2017-05-05 2017-03-31 13F COLUMBIA BKG SYS COM 197236102 10,942 973 9.76 427 -4.04 0.0019
2017-02-02 2016-12-31 13F COLUMBIA BKG SYS COM 197236102 9,969 9,879 10,976.67 445 14,733.33 0.0022
2016-11-04 2016-09-30 13F COLUMBIA BKG SYS COM 197236102 90 90 0.00 3 0.0000
2016-05-10 2016-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 0 -70 -100.00 0 -100.00
2016-02-03 2015-12-31 13F COLUMBIA BKG SYS COM 197236102 70 70 0.00 2 0.0000
2015-05-01 2015-03-31 13F COLUMBIA BKG SYS COM 197236102 0 -103 -100.00 0 -100.00
2015-02-10 2014-12-31 13F COLUMBIA BKG SYS COM 197236102 103 103 3 0.0000
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.