Columbia Banking System, Inc.
US ˙ NasdaqGS ˙ US1972361026

SecurityCOLB / Columbia Banking System, Inc.
InstitutionXTX Topco Ltd
Latest Disclosed Ownership41,784 shares
Latest Disclosed Value $ 1,146,135
XTX Topco Ltd reports 74.66% decrease in ownership of COLB / Columbia Banking System, Inc.

On May 15, 2026 - XTX Topco Ltd filed a 13F-HR form disclosing ownership of 41,784 shares of Columbia Banking System, Inc. (US:COLB) valued at $1,146,135 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 164,893 shares of Columbia Banking System, Inc.. This represents a change in shares of -74.66% during the quarter. The current value of the position is $1,232,628 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 41,784 -123,109 -74.66 1,146 -75.13 0.0199
2026-02-17 2025-12-31 13F COLUMBIA BKG SYS COM 197236102 164,893 126,084 324.88 4,609 361.72 0.1210
2025-11-14 2025-09-30 13F COLUMBIA BKG SYS COM 197236102 38,809 38,809 999 0.0518
2025-05-08 2025-03-31 13F COLUMBIA BKG SYS COM 197236102 0 -12,751 -100.00 0 -100.00
2025-02-13 2024-12-31 13F COLUMBIA BKG SYS COM 197236102 12,751 -39,545 -75.62 344 -74.80 0.0283
2024-11-14 2024-09-30 13F COLUMBIA BKG SYS COM 197236102 52,296 52,296 1,365 0.0987
2024-08-12 2024-06-30 13F COLUMBIA BKG SYS COM 197236102 0 -24,158 -100.00 0 -100.00
2024-05-13 2024-03-31 13F COLUMBIA BKG SYS COM 197236102 24,158 974 4.20 467 -24.43 0.0630
2024-02-13 2023-12-31 13F COLUMBIA BKG SYS COM 197236102 23,184 23,184 619 0.1355
2023-11-13 2023-09-30 13F COLUMBIA BKG SYS COM 197236102 0 -29,973 -100.00 0 -100.00
2023-08-14 2023-06-30 13F COLUMBIA BKG SYS COM 197236102 29,973 29,973 608 0.1089
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.