William Blair & Company
IWB icon

William Blair & Company’s iShares Russell 1000 ETF IWB Stock Holding History

William Blair & Company’s Portfolio IWB Stock Details IWB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$28.8M Buy
80,895
+4,751
+6% +$1.77M 0.08% 199
2025
Q4 		$28.4M Sell
76,144
-469
-0.6% -$174K 0.08% 189
2025
Q3 		$28M Buy
76,613
+361
+0.5% +$127K 0.07% 194
2025
Q2 		$25.9M Sell
76,252
-1,050
-1% -$330K 0.07% 196
2025
Q1 		$23.7M Sell
77,302
-3,982
-5% -$1.29M 0.07% 198
2024
Q4 		$26.2M Sell
81,284
-529
-0.6% -$171K 0.08% 196
2024
Q3 		$25.7M Sell
81,813
-309
-0.4% -$93.6K 0.08% 198
2024
Q2 		$24.4M Buy
82,122
+1,274
+2% +$366K 0.08% 199
2024
Q1 		$23.3M Sell
80,848
-16,577
-17% -$4.54M 0.07% 195
2023
Q4 		$25.6M Sell
97,425
-3,056
-3% -$748K 0.09% 180
2023
Q3 		$23.6M Sell
100,481
-1,670
-2% -$409K 0.09% 179
2023
Q2 		$24.9M Sell
102,151
-1,018
-1% -$234K 0.09% 176
2023
Q1 		$23.2M Buy
103,169
+1,281
+1% +$282K 0.09% 183
2022
Q4 		$21.4M Buy
101,888
+3,372
+3% +$714K 0.09% 183
2022
Q3 		$19.4M Sell
98,516
-9,319
-9% -$2.04M 0.09% 189
2022
Q2 		$22.4M Buy
107,835
+845
+0.8% +$191K 0.1% 182
2022
Q1 		$26.8M Buy
106,990
+1,610
+2% +$398K 0.09% 190
2021
Q4 		$27.9M Sell
105,380
-3,593
-3% -$925K 0.09% 206
2021
Q3 		$26.3M Sell
108,973
-2,365
-2% -$588K 0.09% 197
2021
Q2 		$27M Buy
111,338
+6,663
+6% +$1.57M 0.09% 192
2021
Q1 		$23.4M Sell
104,675
-5,308
-5% -$1.16M 0.09% 203
2020
Q4 		$23.3M Buy
109,983
+27
+0% +$5.39K 0.09% 199
2020
Q3 		$20.6M Buy
109,956
+725
+0.7% +$134K 0.09% 188
2020
Q2 		$18.8M Buy
109,231
+7,659
+8% +$1.24M 0.09% 187
2020
Q1 		$14.4M Buy
101,572
+12,519
+14% +$2.12M 0.09% 183
2019
Q4 		$15.9M Buy
89,053
+26,678
+43% +$4.55M 0.08% 210
2019
Q3 		$10.3M Buy
62,375
+18,953
+44% +$3.11M 0.06% 255
2019
Q2 		$7.07M Sell
43,422
-2,029
-4% -$325K 0.04% 318
2019
Q1 		$7.15M Sell
45,451
-97
-0.2% -$14.7K 0.04% 306
2018
Q4 		$6.32M Sell
45,548
-689
-1% -$103K 0.05% 296
2018
Q3 		$7.48M Buy
46,237
+13,185
+40% +$2.09M 0.05% 302
2018
Q2 		$5.02M Sell
33,052
-599
-2% -$90.2K 0.03% 354
2018
Q1 		$4.94M Buy
33,651
+942
+3% +$143K 0.03% 346
2017
Q4 		$4.86M Buy
32,709
+1,173
+4% +$170K 0.03% 362
2017
Q3 		$4.41M Buy
31,536
+1,019
+3% +$140K 0.03% 366
2017
Q2 		$4.13M Sell
30,517
-339
-1% -$45.3K 0.03% 385
2017
Q1 		$4.06M Buy
30,856
+15,349
+99% +$1.99M 0.03% 366
2016
Q4 		$1.93M Buy
15,507
+870
+6% +$106K 0.02% 500
2016
Q3 		$1.76M Buy
14,637
+588
+4% +$70.7K 0.02% 521
2016
Q2 		$1.64M Buy
14,049
+10,275
+272% +$1.18M 0.02% 508
2016
Q1 		$430K Buy
3,774
+1,430
+61% +$155K ﹤0.01% 830
2015
Q4 		$265K Hold
2,344
– – ﹤0.01% 989
2015
Q3 		$250K Sell
2,344
-156
-6% -$17.7K ﹤0.01% 1202
2015
Q2 		$290K Sell
2,500
-255
-9% -$30.1K ﹤0.01% 1942
2015
Q1 		$319K Sell
2,755
-2,015
-42% -$233K ﹤0.01% 1867
2014
Q4 		$547K Sell
4,770
-355
-7% -$39.8K ﹤0.01% 1666
2014
Q3 		$563K Sell
5,125
-1,108
-18% -$122K ﹤0.01% 1657
2014
Q2 		$686K Buy
6,233
+45
+0.7% +$4.79K ﹤0.01% 1565
2014
Q1 		$648K Sell
6,188
-416
-6% -$42.8K ﹤0.01% 1543
2013
Q4 		$681K Sell
6,604
-660
-9% -$65.3K ﹤0.01% 1492
2013
Q3 		$684K Buy
7,264
+770
+12% +$72K ﹤0.01% 1451
2013
Q2 		$584K Buy
+6,494
New +$582K ﹤0.01% 1455

Other funds holding IWB

Jones Financial Companies
Jones Financial Companies Des Peres, Missouri $208B AUM 16.12% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Envestnet Asset Management
Envestnet Asset Management Chicago, Illinois $374B AUM 17.66% 1-Year Est. Return
M&T Bank
M&T Bank Buffalo, New York $29.2B AUM 22.81% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return
LPL Financial
LPL Financial San Diego, California $377B AUM 19.32% 1-Year Est. Return
PNC Financial Services Group
PNC Financial Services Group Pittsburgh, Pennsylvania $173B AUM 20.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Focus Partners Wealth
Focus Partners Wealth Boston, Massachusetts $89.9B AUM 20.5% 1-Year Est. Return

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

William Blair & Company increased its iShares Russell 1000 ETF (IWB) stake by 6.2% in Q1 2026, buying an estimated $1.77M and bringing the position to 80,895 shares worth $28.8M. The position accounts for 0.08% of the portfolio, ranked #199.

William Blair & Company first reported a position in IWB in Q2 2013 and has held it in 52 quarters since. 1,466 funds tracked by Wall St. Rank hold IWB as of Q1 2026.

  • William Blair & Company held 80,895 shares of iShares Russell 1000 ETF worth $28.8M as of Q1 2026.
  • William Blair & Company bought 4,751 iShares Russell 1000 ETF shares in Q1 2026, an estimated $1.77M.
  • iShares Russell 1000 ETF made up 0.08% of William Blair & Company's portfolio in Q1 2026, its #199 holding.
  • William Blair & Company first reported a position in iShares Russell 1000 ETF in Q2 2013 and has held it in 52 quarters since.
  • 1,466 funds tracked by Wall St. Rank held iShares Russell 1000 ETF as of Q1 2026.

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