William Blair & Company
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William Blair & Company’s Adaptive Biotechnologies ADPT Stock Holding History

William Blair & Company’s Portfolio ADPT Stock Details ADPT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$3M Buy
140,061
+3,972
+3% +$60.9K 0.01% 656
2026
Q1 		$1.89M Buy
136,089
+49,623
+57% +$791K 0.01% 748
2025
Q4 		$1.4M Sell
86,466
-11,071
-11% -$181K ﹤0.01% 843
2025
Q3 		$1.46M Buy
97,537
+86,288
+767% +$1.05M ﹤0.01% 823
2025
Q2 		$131K Hold
11,249
– – ﹤0.01% 1481
2025
Q1 		$83.6K Buy
+11,249
New +$86.5K ﹤0.01% 1525
2024
Q1 		– Sell
-14,649
Closed -$71.8K – 1788
2023
Q4 		$71.8K Sell
14,649
-49,015
-77% -$224K ﹤0.01% 1544
2023
Q3 		$347K Sell
63,664
-13,400
-17% -$88.6K ﹤0.01% 1171
2023
Q2 		$517K Sell
77,064
-1,800
-2% -$13.4K ﹤0.01% 1045
2023
Q1 		$696K Buy
78,864
+7,618
+11% +$67.2K ﹤0.01% 935
2022
Q4 		$544K Sell
71,246
-5,285
-7% -$41.1K ﹤0.01% 1016
2022
Q3 		$545K Buy
76,531
+2,880
+4% +$27.1K ﹤0.01% 1011
2022
Q2 		$596K Sell
73,651
-77,760
-51% -$684K ﹤0.01% 1009
2022
Q1 		$2.1M Sell
151,411
-17,225
-10% -$271K 0.01% 683
2021
Q4 		$4.73M Sell
168,636
-84,607
-33% -$2.59M 0.01% 485
2021
Q3 		$8.61M Sell
253,243
-25,716
-9% -$930K 0.03% 350
2021
Q2 		$11.4M Sell
278,959
-8,224
-3% -$320K 0.04% 303
2021
Q1 		$11.6M Sell
287,183
-159,770
-36% -$8.65M 0.04% 294
2020
Q4 		$26.4M Buy
446,953
+16,955
+4% +$874K 0.1% 181
2020
Q3 		$20.9M Buy
429,998
+245,355
+133% +$10.3M 0.09% 186
2020
Q2 		$8.93M Buy
184,643
+66,745
+57% +$2.43M 0.04% 283
2020
Q1 		$3.27M Sell
117,898
-106,072
-47% -$2.96M 0.02% 418
2019
Q4 		$6.7M Buy
223,970
+107,958
+93% +$3.1M 0.03% 334
2019
Q3 		$3.58M Buy
+116,012
New +$4.73M 0.02% 450

Other funds holding ADPT

Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
Westfield Capital Management
Westfield Capital Management Boston, Massachusetts $30.6B AUM 61.81% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

William Blair & Company's ADPT Position: Q2 2026 in Review

William Blair & Company increased its Adaptive Biotechnologies (ADPT) stake by 2.9% in Q2 2026, buying an estimated $60.9K and bringing the position to 140,061 shares worth $3M. The position accounts for 0.01% of the portfolio, ranked #656.

William Blair & Company first reported a position in ADPT in Q3 2019 and has held it in 24 quarters since. The position peaked at $26.4M in Q4 2020. 300 funds tracked by Wall St. Rank hold ADPT as of Q2 2026.

  • William Blair & Company held 140,061 shares of Adaptive Biotechnologies worth $3M as of Q2 2026.
  • William Blair & Company bought 3,972 Adaptive Biotechnologies shares in Q2 2026, an estimated $60.9K.
  • Adaptive Biotechnologies made up 0.01% of William Blair & Company's portfolio in Q2 2026, its #656 holding.
  • William Blair & Company first reported a position in Adaptive Biotechnologies in Q3 2019 and has held it in 24 quarters since.
  • William Blair & Company's Adaptive Biotechnologies position peaked at $26.4M in Q4 2020.
  • 300 funds tracked by Wall St. Rank held Adaptive Biotechnologies as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.