William Blair & Company
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William Blair & Company’s iShares S&P 100 ETF OEF Stock Holding History

William Blair & Company’s Portfolio OEF Stock Details OEF Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2017
Q3 		– Sell
-200
Closed -$62K – 1463
2017
Q2 		$62K Buy
+200
New +$21.3K ﹤0.01% 1459
2015
Q3 		– Sell
-1,884,000
Closed -$74.6M – 1500
2015
Q2 		$74.6M Buy
1,884,000
+591,600
+46% +$54.7M 0.11% 250
2015
Q1 		$51.9M Buy
1,292,400
+196,600
+18% +$17.9M 0.08% 322
2014
Q4 		$43.1M Buy
+1,095,800
New +$98M 0.07% 367

Other funds holding OEF

Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Fifth Third Bancorp
Fifth Third Bancorp Cincinnati, Ohio $54.7B AUM 26.51% 1-Year Est. Return
Jones Financial Companies
Jones Financial Companies Des Peres, Missouri $208B AUM 16.12% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
LPL Financial
LPL Financial San Diego, California $377B AUM 19.32% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Focus Partners Wealth
Focus Partners Wealth Boston, Massachusetts $89.9B AUM 20.5% 1-Year Est. Return
Wells Fargo
Wells Fargo San Francisco, California $530B AUM 22.01% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return

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

William Blair & Company reduced its iShares S&P 100 ETF (OEF) stake by 1.2% in Q1 2026, selling an estimated $86.8K and leaving 21,931 shares worth $6.98M. The position accounts for 0.02% of the portfolio, ranked #426.

William Blair & Company first reported a position in OEF in Q4 2015 and has held it in 38 quarters since. The position peaked at $7.61M in Q4 2025. 1,001 funds tracked by Wall St. Rank hold OEF as of Q1 2026.

  • William Blair & Company held 21,931 shares of iShares S&P 100 ETF worth $6.98M as of Q1 2026.
  • William Blair & Company sold 259 iShares S&P 100 ETF shares in Q1 2026, an estimated $86.8K.
  • iShares S&P 100 ETF made up 0.02% of William Blair & Company's portfolio in Q1 2026, its #426 holding.
  • William Blair & Company first reported a position in iShares S&P 100 ETF in Q4 2015 and has held it in 38 quarters since.
  • William Blair & Company's iShares S&P 100 ETF position peaked at $7.61M in Q4 2025.
  • 1,001 funds tracked by Wall St. Rank held iShares S&P 100 ETF as of Q1 2026.

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