William Blair & Company’s State Street SPDR S&P Biotech ETF XBI Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$10.4M Sell
81,152
-21,715
-21% -$2.71M 0.03% 344
2025
Q4
$12.5M Buy
102,867
+1,057
+1% +$121K 0.03% 316
2025
Q3
$10.2M Buy
101,810
+2,590
+3% +$233K 0.03% 354
2025
Q2
$8.23M Sell
99,220
-38,301
-28% -$3.06M 0.02% 388
2025
Q1
$11.2M Sell
137,521
-2,233
-2% -$200K 0.03% 311
2024
Q4
$12.6M Sell
139,754
-4,112
-3% -$398K 0.04% 308
2024
Q3
$14.2M Buy
143,866
+2,351
+2% +$231K 0.04% 292
2024
Q2
$13.1M Sell
141,515
-9,047
-6% -$811K 0.04% 290
2024
Q1
$14.3M Buy
150,562
+45,053
+43% +$4.18M 0.04% 272
2023
Q4
$9.42M Sell
105,509
-2,159
-2% -$160K 0.03% 333
2023
Q3
$7.86M Sell
107,668
-1,492
-1% -$119K 0.03% 347
2023
Q2
$9.08M Buy
109,160
+2,048
+2% +$171K 0.03% 327
2023
Q1
$8.16M Sell
107,112
-402
-0.4% -$33.4K 0.03% 345
2022
Q4
$8.92M Buy
107,514
+4,570
+4% +$370K 0.04% 312
2022
Q3
$8.17M Buy
102,944
+31,285
+44% +$2.64M 0.04% 318
2022
Q2
$5.32M Buy
71,659
+15,041
+27% +$1.13M 0.02% 405
2022
Q1
$5.09M Sell
56,618
-21,809
-28% -$2.01M 0.02% 463
2021
Q4
$8.78M Sell
78,427
-12,762
-14% -$1.54M 0.03% 366
2021
Q3
$11.5M Buy
91,189
+4,639
+5% +$597K 0.04% 306
2021
Q2
$11.7M Sell
86,550
-7,605
-8% -$1,000K 0.04% 299
2021
Q1
$12.8M Sell
94,155
-157,590
-63% -$23.6M 0.05% 278
2020
Q4
$35.4M Buy
251,745
+198,640
+374% +$25.4M 0.13% 158
2020
Q3
$5.92M Buy
53,105
+29,983
+130% +$3.36M 0.03% 362
2020
Q2
$2.59M Buy
23,122
+12,246
+113% +$1.21M 0.01% 501
2020
Q1
$842K Sell
10,876
-708
-6% -$62.7K 0.01% 718
2019
Q4
$1.1M Sell
11,584
-3,373
-23% -$292K 0.01% 755
2019
Q3
$1.14M Sell
14,957
-2,726
-15% -$227K 0.01% 710
2019
Q2
$1.55M Sell
17,683
-16,925
-49% -$1.44M 0.01% 648
2019
Q1
$3.13M Buy
34,608
+26,046
+304% +$2.22M 0.02% 449
2018
Q4
$614K Buy
8,562
+3,779
+79% +$304K ﹤0.01% 839
2018
Q3
$459K Buy
4,783
+388
+9% +$37.6K ﹤0.01% 984
2018
Q2
$418K Buy
4,395
+1,215
+38% +$112K ﹤0.01% 1003
2018
Q1
$279K Buy
3,180
+402
+14% +$36.7K ﹤0.01% 1094
2017
Q4
$236K Buy
+2,778
New +$233K ﹤0.01% 1218
2017
Q3
Sell
-2,936
Closed -$227K 1526
2017
Q2
$227K Buy
+2,936
New +$208K ﹤0.01% 1293
2017
Q1
Sell
-6,508
Closed -$385K 1515
2016
Q4
$385K Buy
+6,508
New +$402K ﹤0.01% 920

Other funds holding XBI

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

William Blair & Company reduced its State Street SPDR S&P Biotech ETF (XBI) stake by 21% in Q1 2026, selling an estimated $2.71M and leaving 81,152 shares worth $10.4M. The position accounts for 0.03% of the portfolio, ranked #344.

William Blair & Company first reported a position in XBI in Q4 2016 and has held it in 36 quarters since. The position peaked at $35.4M in Q4 2020. 814 funds tracked by Wall St. Rank hold XBI as of Q1 2026.

  • William Blair & Company held 81,152 shares of State Street SPDR S&P Biotech ETF worth $10.4M as of Q1 2026.
  • William Blair & Company sold 21,715 State Street SPDR S&P Biotech ETF shares in Q1 2026, an estimated $2.71M.
  • State Street SPDR S&P Biotech ETF made up 0.03% of William Blair & Company's portfolio in Q1 2026, its #344 holding.
  • William Blair & Company first reported a position in State Street SPDR S&P Biotech ETF in Q4 2016 and has held it in 36 quarters since.
  • William Blair & Company's State Street SPDR S&P Biotech ETF position peaked at $35.4M in Q4 2020.
  • 814 funds tracked by Wall St. Rank held State Street SPDR S&P Biotech ETF as of Q1 2026.

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