Columbia Banking System, Inc.
US ˙ NasdaqGS ˙ US1972361026

SecurityCOLB / Columbia Banking System, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership4,902,181 shares
Latest Disclosed Value $ 134,466,931
Morgan Stanley reports 16.73% decrease in ownership of COLB / Columbia Banking System, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 4,902,181 shares of Columbia Banking System, Inc. (US:COLB) valued at $134,466,825 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 5,886,839 shares of Columbia Banking System, Inc.. This represents a change in shares of -16.73% during the quarter. The current value of the position is $144,614,340 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)
2026-05-15 2026-03-31 13F COLUMBIA BKG SYS COM 197236102 4,902,181 -984,658 -16.73 134,467 -18.28 0.0081
2026-05-27 2025-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 5,886,839 -2,455,479 -29.43 164,537 -23.38 0.0098
2026-02-13 2025-12-31 13F COLUMBIA BKG SYS COM 197236102 5,886,839 -2,455,479 164,537 0.0098
2026-05-27 2025-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 8,342,318 164,237 2.01 214,731 12.31 0.0130
2025-11-14 2025-09-30 13F COLUMBIA BKG SYS COM 197236102 8,342,318 164,237 214,731 0.0130
2025-08-15 2025-06-30 13F COLUMBIA BKG SYS COM 197236102 8,178,081 2,168,093 36.07 191,204 27.56 0.0125
2025-05-15 2025-03-31 13F COLUMBIA BKG SYS COM 197236102 6,009,988 225,719 3.90 149,889 -4.06 0.0107
2025-05-15 2024-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 5,784,269 -672,464 -10.41 156,233 -7.33 0.0109
2025-02-14 2024-12-31 13F COLUMBIA BKG SYS COM 197236102 5,784,269 -672,464 156,233 0.0109
2025-05-14 2024-09-30 13F/A-2 COLUMBIA BKG SYS COM 197236102 6,456,733 75,032 1.18 168,585 32.82 0.0122
2025-02-14 2024-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 6,456,733 75,032 168,585 0.0122
2024-11-14 2024-09-30 13F COLUMBIA BKG SYS COM 197236102 6,456,733 75,032 168,585 0.0015
2025-05-14 2024-06-30 13F/A-2 COLUMBIA BKG SYS COM 197236102 6,381,701 -2,071,369 -24.50 126,932 -22.40 0.0098
2024-10-17 2024-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 6,381,701 -2,071,369 126,932 0.0098
2024-08-14 2024-06-30 13F COLUMBIA BKG SYS COM 197236102 6,381,701 -2,071,369 126,932 0.0098
2024-10-17 2024-03-31 13F/A-2 COLUMBIA BKG SYS COM 197236102 8,453,070 1,469,088 21.04 163,567 -12.22 0.0131
2024-08-16 2024-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 8,453,070 1,469,088 163,567 0.0015
2024-05-15 2024-03-31 13F COLUMBIA BKG SYS COM 197236102 8,453,070 1,469,088 163,567 0.0131
2024-08-16 2023-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 6,983,982 -259,327 -3.58 186,333 26.72 0.0164
2024-02-13 2023-12-31 13F COLUMBIA BKG SYS COM 197236102 6,983,982 -259,327 186,333 0.0164
2023-11-15 2023-09-30 13F COLUMBIA BKG SYS COM 197236102 7,243,309 -174,958 -2.36 147,039 -2.26 0.0150
2023-08-14 2023-06-30 13F COLUMBIA BKG SYS COM 197236102 7,418,267 571,601 8.35 150,442 2.58 0.0148
2023-05-15 2023-03-31 13F COLUMBIA BKG SYS COM 197236102 6,846,666 5,971,016 681.90 146,656 455.87 0.0157
2023-02-14 2022-12-31 13F COLUMBIA BKG SYS COM 197236102 875,650 -47,791 -5.18 26,383 -1.11 0.0030
2022-11-14 2022-09-30 13F COLUMBIA BKG SYS COM 197236102 923,441 55 0.01 26,679 0.85 0.0036
2022-10-27 2022-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 923,386 387,133 72.19 26,455 52.87 0.0034
2022-08-15 2022-06-30 13F COLUMBIA BKG SYS COM 197236102 923,386 387,133 26,455 0.0034
2022-10-27 2022-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 536,253 -172,936 -24.39 17,305 -25.43 0.0023
2022-05-13 2022-03-31 13F COLUMBIA BKG SYS COM 197236102 536,253 -172,936 17,305 0.0023
2022-02-14 2021-12-31 13F COLUMBIA BKG SYS COM 197236102 709,189 405,035 133.17 23,205 100.84 0.0029
2021-11-15 2021-09-30 13F COLUMBIA BKG SYS COM 197236102 304,154 -102,729 -25.25 11,554 -26.36 0.0016
2021-08-23 2021-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 406,883 62,511 18.15 15,689 5.74 0.0021
2021-08-16 2021-06-30 13F COLUMBIA BKG SYS COM 197236102 406,883 62,511 15,689 0.0004
2021-05-17 2021-03-31 13F COLUMBIA BKG SYS COM 197236102 344,372 21,077 6.52 14,838 27.85 0.0022
2021-02-16 2020-12-31 13F COLUMBIA BKG SYS COM 197236102 323,295 -12,930 -3.85 11,606 44.75 0.0018
2020-11-13 2020-09-30 13F COLUMBIA BKG SYS COM 197236102 336,225 91,864 37.59 8,018 15.75 0.0016
2020-08-14 2020-06-30 13F COLUMBIA BKG SYS COM 197236102 244,361 28,779 13.35 6,927 19.91 0.0015
2020-05-26 2020-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 215,582 -154,826 -41.80 5,777 -61.66 0.0016
2020-05-15 2020-03-31 13F COLUMBIA BKG SYS COM 197236102 215,582 -154,826 5,777 443.7940
2020-02-14 2019-12-31 13F COLUMBIA BKG SYS COM 197236102 370,408 107,556 40.92 15,069 55.37 0.0035
2019-11-14 2019-09-30 13F COLUMBIA BKG SYS COM 197236102 262,852 -81,983 -23.77 9,699 -22.26 0.0026
2019-08-14 2019-06-30 13F COLUMBIA BKG SYS COM 197236102 344,835 158,823 85.38 12,476 105.13 0.0033
2019-05-15 2019-03-31 13F COLUMBIA BKG SYS COM 197236102 186,012 53,684 40.57 6,082 26.63 0.0017
2019-02-14 2018-12-31 13F COLUMBIA BKG SYS COM 197236102 132,328 -97,736 -42.48 4,803 -46.15 0.0014
2019-04-23 2018-09-30 13F/A-2 COLUMBIA BKG SYS COM 197236102 230,064 53,542 30.33 8,920 23.56 0.0022
2018-11-20 2018-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 230,064 0 8,920 0.0022
2018-11-14 2018-09-30 13F COLUMBIA BKG SYS COM 197236102 230,064 53,542 8,920
2019-04-23 2018-06-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 176,522 -43,835 -19.89 7,219 -21.91 0.0020
2018-08-14 2018-06-30 13F COLUMBIA BKG SYS COM 197236102 176,522 -43,835 7,219
2019-04-23 2018-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 220,357 -12,040 -5.18 9,244 -8.43 0.0026
2018-05-14 2018-03-31 13F COLUMBIA BKG SYS COM 197236102 220,357 -12,040 9,244
2019-04-23 2017-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 232,397 144,179 163.43 10,095 171.74 0.0028
2018-02-14 2017-12-31 13F COLUMBIA BKG SYS COM 197236102 232,397 144,179 10,095
2017-11-14 2017-09-30 13F COLUMBIA BKG SYS COM 197236102 88,218 23,023 35.31 3,715 43.05 0.0011
2017-08-11 2017-06-30 13F COLUMBIA BKG SYS COM 197236102 65,195 -33,373 -33.86 2,597 -32.40 0.0008
2017-05-22 2017-03-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 98,568 -84,238 -46.08 3,842 -52.96 0.0012
2017-05-12 2017-03-31 13F COLUMBIA BKG SYS COM 197236102 98,568 3,842
2017-02-22 2016-12-31 13F/A-1 COLUMBIA BKG SYS COM 197236102 182,806 159,575 686.91 8,168 974.74 0.0027
2017-02-13 2016-12-31 13F COLUMBIA BKG SYS COM 197236102 182,806 8,168
2016-11-10 2016-09-30 13F COLUMBIA BKG SYS COM 197236102 23,231 10,838 87.45 760 119.65 0.0003
2016-08-12 2016-06-30 13F COLUMBIA BKG SYS COM 197236102 12,393 452 3.79 346 -3.35 0.0001
2016-05-12 2016-03-31 13F COLUMBIA BKG SYS COM 197236102 11,941 -1,730 -12.65 358 -19.37 0.0001
2016-02-09 2015-12-31 13F COLUMBIA BKG SYS COM 197236102 13,671 1,764 14.81 444 19.68 0.0002
2016-02-08 2015-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 11,907 -3,837 -24.37 371 -27.54 0.0001
2015-11-09 2015-09-30 13F COLUMBIA BKG SYS COM 197236102 11,907 371
2015-08-12 2015-06-30 13F COLUMBIA BKG SYS COM 197236102 15,744 1,348 9.36 512 22.78 0.0002
2015-05-14 2015-03-31 13F COLUMBIA BKG SYS COM 197236102 14,396 -25,406 -63.83 417 -62.06 0.0002
2015-02-13 2014-12-31 13F COLUMBIA BKG SYS COM 197236102 39,802 -5,413 -11.97 1,099 -2.05 0.0004
2014-12-16 2014-09-30 13F/A-1 COLUMBIA BKG SYS COM 197236102 45,215 -3,460 -7.11 1,122 -12.41 0.0004
2014-11-14 2014-09-30 13F COLUMBIA BKG SYS COM 197236102 45,215 1,122
2014-08-12 2014-06-30 13F COLUMBIA BKG SYS COM 197236102 48,675 -4,095 -7.76 1,281 -14.94 0.0022
2014-05-13 2014-03-31 13F COLUMBIA BKG SYS COM 197236102 52,770 24,382 85.89 1,506 92.83 0.0006
2014-02-13 2013-12-31 13F COLUMBIA BKG SYS COM 197236102 28,388 -954 -3.25 781 7.58 0.0003
2013-11-13 2013-09-30 13F COLUMBIA BKG SYS INC COM ST COM 197236102 29,342 -11,764 -28.62 726 -25.84 0.0003
2013-08-08 2013-06-30 13F COLUMBIA BKG SYS INC COM ST COM 197236102 41,106 41,106 979 0.0005
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.