William Blair Investment Management
ONT

William Blair Investment Management’s Onterris Inc ONT Stock Holding History

William Blair Investment Management’s Portfolio ONT Stock Details ONT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-1,310,251
Closed -$36M – 440
2025
Q3 		$36M Sell
1,310,251
-1,007,409
-43% -$26.3M 0.09% 175
2025
Q2 		$50.7M Buy
2,317,660
+414,272
+22% +$7.43M 0.13% 136
2025
Q1 		$27.1M Buy
1,903,388
+434,108
+30% +$8.27M 0.08% 237
2024
Q4 		$27.3M Buy
1,469,280
+934,938
+175% +$19.7M 0.07% 272
2024
Q3 		$14.1M Buy
534,342
+15,997
+3% +$517K 0.03% 318
2024
Q2 		$23.1M Sell
518,345
-70,972
-12% -$3.19M 0.06% 284
2024
Q1 		$23.1M Buy
589,317
+3,824
+0.7% +$128K 0.06% 291
2023
Q4 		$18.8M Buy
585,493
+83,860
+17% +$2.41M 0.05% 295
2023
Q3 		$14.7M Buy
501,633
+14,178
+3% +$539K 0.05% 300
2023
Q2 		$20.5M Buy
487,455
+5,119
+1% +$184K 0.07% 277
2023
Q1 		$17.2M Sell
482,336
-167,734
-26% -$7.59M 0.06% 289
2022
Q4 		$28.9M Buy
650,070
+3,690
+0.6% +$156K 0.11% 210
2022
Q3 		$21.8M Buy
646,380
+33,051
+5% +$1.31M 0.09% 247
2022
Q2 		$20.7M Buy
613,329
+3,435
+0.6% +$144K 0.08% 259
2022
Q1 		$32.3M Buy
609,894
+13,174
+2% +$652K 0.1% 234
2021
Q4 		$42.1M Sell
596,720
-159,730
-21% -$11.1M 0.11% 192
2021
Q3 		$46.7M Buy
756,450
+8,304
+1% +$434K 0.13% 178
2021
Q2 		$40.1M Sell
748,146
-28,919
-4% -$1.52M 0.13% 160
2021
Q1 		$39M Buy
777,065
+28,705
+4% +$1.21M 0.13% 160
2020
Q4 		$23.2M Buy
748,360
+306,205
+69% +$8.71M 0.08% 196
2020
Q3 		$10.5M Buy
+442,155
New +$11.2M 0.04% 264

Other funds holding ONT

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
NAMI
Nomura Asset Management International Philadelphia, Pennsylvania $58.4B AUM
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return
FAM
Fred Alger Management New York $22.8B AUM 64.63% 1-Year Est. Return
DekaBank Deutsche Girozentrale
DekaBank Deutsche Girozentrale Frankfurt, Germany $59.2B AUM 26.02% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return

William Blair Investment Management's ONT Position: Q4 2025 in Review

William Blair Investment Management sold out of Onterris Inc (ONT) in Q4 2025, closing a stake of 1,310,251 shares — an estimated $36M sold.

William Blair Investment Management first reported a position in ONT in Q3 2020 and held it in 21 quarters. The position peaked at $50.7M in Q2 2025. 185 funds tracked by Wall St. Rank hold ONT as of Q4 2025.

  • William Blair Investment Management reported no remaining Onterris Inc position as of Q4 2025 after selling out during the quarter.
  • William Blair Investment Management sold 1,310,251 Onterris Inc shares in Q4 2025, an estimated $36M.
  • William Blair Investment Management first reported a position in Onterris Inc in Q3 2020 and held it in 21 quarters.
  • William Blair Investment Management's Onterris Inc position peaked at $50.7M in Q2 2025.
  • 185 funds tracked by Wall St. Rank held Onterris Inc as of Q4 2025.

Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.