William Blair Investment Management
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William Blair Investment Management’s Columbia Banking Systems COLB Stock Holding History

William Blair Investment Management’s Portfolio COLB Stock Details COLB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$344K Buy
12,529
+297
+2% +$8.59K ﹤0.01% 393
2025
Q4 		$342K Sell
12,232
-991,404
-99% -$26.8M ﹤0.01% 395
2025
Q3 		$25.8M Sell
1,003,636
-115,288
-10% -$2.93M 0.07% 253
2025
Q2 		$26.2M Sell
1,118,924
-90,720
-7% -$2.1M 0.07% 247
2025
Q1 		$30.2M Sell
1,209,644
-564,799
-32% -$15M 0.08% 219
2024
Q4 		$47.9M Buy
1,774,443
+42,527
+2% +$1.22M 0.12% 159
2024
Q3 		$45.2M Sell
1,731,916
-54,929
-3% -$1.31M 0.11% 150
2024
Q2 		$35.5M Sell
1,786,845
-5,726
-0.3% -$109K 0.09% 187
2024
Q1 		$34.7M Buy
1,792,571
+215,220
+14% +$4.43M 0.09% 216
2023
Q4 		$42.1M Buy
1,577,351
+72,211
+5% +$1.6M 0.12% 156
2023
Q3 		$30.6M Buy
1,505,140
+147,011
+11% +$3.07M 0.1% 213
2023
Q2 		$27.5M Buy
1,358,129
+373,437
+38% +$7.89M 0.09% 241
2023
Q1 		$21.1M Buy
984,692
+232,833
+31% +$6.47M 0.07% 275
2022
Q4 		$22.7M Buy
751,859
+152,210
+25% +$4.83M 0.09% 249
2022
Q3 		$17.3M Buy
599,649
+33,273
+6% +$1M 0.07% 269
2022
Q2 		$16.2M Buy
+566,376
New +$16.7M 0.06% 279
2021
Q2 		– Sell
-445,145
Closed -$19.2M – 468
2021
Q1 		$19.2M Buy
445,145
+110,538
+33% +$4.82M 0.06% 226
2020
Q4 		$12M Buy
334,607
+72,426
+28% +$2.25M 0.04% 271
2020
Q3 		$6.25M Buy
+262,181
New +$7.24M 0.02% 309
2018
Q2 		– Sell
-91,946
Closed -$3.86M – 483
2018
Q1 		$3.86M Buy
91,946
+5,954
+7% +$258K 0.01% 365
2017
Q4 		$3.73M Buy
85,992
+35,982
+72% +$1.57M 0.01% 362
2017
Q3 		$2.11M Buy
+50,010
New +$1.93M 0.01% 388

Other funds holding COLB

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Charles Schwab
Charles Schwab San Francisco, California $654B AUM 26.35% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

William Blair Investment Management's COLB Position: Q1 2026 in Review

William Blair Investment Management increased its Columbia Banking Systems (COLB) stake by 2.4% in Q1 2026, buying an estimated $8.59K and bringing the position to 12,529 shares worth $344K. The position accounts for ﹤0.01% of the portfolio, ranked #393.

William Blair Investment Management first reported a position in COLB in Q3 2017 and has held it in 22 quarters since. The position peaked at $47.9M in Q4 2024. 524 funds tracked by Wall St. Rank hold COLB as of Q1 2026.

  • William Blair Investment Management held 12,529 shares of Columbia Banking Systems worth $344K as of Q1 2026.
  • William Blair Investment Management bought 297 Columbia Banking Systems shares in Q1 2026, an estimated $8.59K.
  • Columbia Banking Systems made up ﹤0.01% of William Blair Investment Management's portfolio in Q1 2026, its #393 holding.
  • William Blair Investment Management first reported a position in Columbia Banking Systems in Q3 2017 and has held it in 22 quarters since.
  • William Blair Investment Management's Columbia Banking Systems position peaked at $47.9M in Q4 2024.
  • 524 funds tracked by Wall St. Rank held Columbia Banking Systems as of Q1 2026.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.