William Blair & Company
ONT

William Blair & Company’s Onterris Inc ONT Stock Holding History

William Blair & Company’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
2026
Q1 		$5.84M Sell
266,980
-73,889
-22% -$1.77M 0.02% 472
2025
Q4 		$8.46M Buy
340,869
+11,893
+4% +$314K 0.02% 397
2025
Q3 		$9.03M Sell
328,976
-21,155
-6% -$553K 0.02% 386
2025
Q2 		$7.66M Buy
350,131
+15,910
+5% +$285K 0.02% 405
2025
Q1 		$4.77M Sell
334,221
-312,391
-48% -$5.95M 0.01% 494
2024
Q4 		$12M Sell
646,612
-104,076
-14% -$2.19M 0.03% 313
2024
Q3 		$19.7M Sell
750,688
-18,965
-2% -$613K 0.06% 235
2024
Q2 		$34.3M Buy
769,653
+37,335
+5% +$1.68M 0.11% 153
2024
Q1 		$28.7M Buy
732,318
+170,924
+30% +$5.73M 0.09% 172
2023
Q4 		$18M Sell
561,394
-241,172
-30% -$6.92M 0.06% 220
2023
Q3 		$23.5M Sell
802,566
-227,563
-22% -$8.65M 0.09% 180
2023
Q2 		$43.4M Buy
1,030,129
+27,392
+3% +$985K 0.16% 129
2023
Q1 		$35.8M Buy
1,002,737
+203,696
+25% +$9.22M 0.14% 138
2022
Q4 		$35.5M Buy
799,041
+46,433
+6% +$1.96M 0.15% 131
2022
Q3 		$25.3M Buy
752,608
+67,471
+10% +$2.68M 0.12% 164
2022
Q2 		$23.1M Sell
685,137
-58,881
-8% -$2.46M 0.1% 178
2022
Q1 		$39.4M Buy
744,018
+195,650
+36% +$9.69M 0.14% 154
2021
Q4 		$38.7M Buy
548,368
+247,176
+82% +$17.1M 0.12% 159
2021
Q3 		$18.6M Buy
301,192
+27,905
+10% +$1.46M 0.06% 231
2021
Q2 		$14.7M Buy
273,287
+75,774
+38% +$3.99M 0.05% 259
2021
Q1 		$9.91M Buy
197,513
+23,440
+13% +$990K 0.04% 318
2020
Q4 		$5.39M Buy
+174,073
New +$4.95M 0.02% 420

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
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
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return
RA
Royce & Associates New York $10.1B AUM 42.88% 1-Year Est. Return
Amundi
Amundi Paris, France $367B AUM 31.23% 1-Year Est. Return

William Blair & Company's ONT Position: Q1 2026 in Review

William Blair & Company reduced its Onterris Inc (ONT) stake by 22% in Q1 2026, selling an estimated $1.77M and leaving 266,980 shares worth $5.84M. The position accounts for 0.02% of the portfolio, ranked #472.

William Blair & Company first reported a position in ONT in Q4 2020 and has held it in 22 quarters since. The position peaked at $43.4M in Q2 2023. 171 funds tracked by Wall St. Rank hold ONT as of Q1 2026.

  • William Blair & Company held 266,980 shares of Onterris Inc worth $5.84M as of Q1 2026.
  • William Blair & Company sold 73,889 Onterris Inc shares in Q1 2026, an estimated $1.77M.
  • Onterris Inc made up 0.02% of William Blair & Company's portfolio in Q1 2026, its #472 holding.
  • William Blair & Company first reported a position in Onterris Inc in Q4 2020 and has held it in 22 quarters since.
  • William Blair & Company's Onterris Inc position peaked at $43.4M in Q2 2023.
  • 171 funds tracked by Wall St. Rank held Onterris Inc as of Q1 2026.

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