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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PIE icon
1701
Invesco Dorsey Wright Emerging Markets Momentum ETF
PIE
$231M
$46.9K ﹤0.01%
1,800
– –
CSD icon
1702
Invesco S&P Spin-Off ETF
CSD
$221M
$46.2K ﹤0.01%
410
– –
FSMD icon
1703
Fidelity Small-Mid Multifactor ETF
FSMD
$2.51B
$45.2K ﹤0.01%
1,010
+620
+159% +$28.4K
IAI icon
1704
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.36B
$45K ﹤0.01%
274
– –
GSUS icon
1705
Goldman Sachs MarketBeta US Equity ETF
GSUS
$3.14B
$44.8K ﹤0.01%
500
-100
-17% -$9.38K
SFIX
1706
Stitch Fix
SFIX
$547M
$44.7K ﹤0.01%
13,511
+991
+8% +$4.04K
ELDN icon
1707
Eledon Pharmaceuticals
ELDN
$263M
$44.7K ﹤0.01%
+14,516
New +$34.2K
ALIT icon
1708
Alight
ALIT
$481M
$43.1K ﹤0.01%
3,698
+2,478
+203% +$59.1K
SFLR icon
1709
Innovator Equity Managed Floor ETF
SFLR
$2.1B
$42.9K ﹤0.01%
+1,211
New +$44.4K
IETC icon
1710
iShares US Tech Independence Focused ETF
IETC
$663M
$42.3K ﹤0.01%
479
-3,508
-88% -$332K
BBH icon
1711
VanEck Biotech ETF
BBH
$405M
$42.3K ﹤0.01%
225
– –
LRGF icon
1712
iShares US Equity Factor ETF
LRGF
$3.55B
$41.8K ﹤0.01%
633
-198
-24% -$13.6K
FTSM icon
1713
First Trust Enhanced Short Maturity ETF
FTSM
$6.51B
$41.3K ﹤0.01%
691
-37
-5% -$2.22K
SMMU icon
1714
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund
SMMU
$1.14B
$40.9K ﹤0.01%
810
– –
ITM icon
1715
VanEck Intermediate Muni ETF
ITM
$2.14B
$40.3K ﹤0.01%
867
+130
+18% +$6.15K
UAA icon
1716
Under Armour
UAA
$2.91B
$39.9K ﹤0.01%
6,752
+1,588
+31% +$10.3K
IFLN
1717
Invesco Bloomberg Enhanced Fallen Angels ETF
IFLN
$308M
$39.2K ﹤0.01%
2,185
– –
XTL icon
1718
State Street SPDR S&P Telecom ETF
XTL
$558M
$38.7K ﹤0.01%
206
– –
FYX icon
1719
First Trust Small Cap Core AlphaDEX Fund
FYX
$1.37B
$38.7K ﹤0.01%
324
+24
+8% +$2.9K
BBUS icon
1720
JPMorgan BetaBuilders US Equity ETF
BBUS
$8.78B
$38.7K ﹤0.01%
330
-810
-71% -$99.3K
CORP icon
1721
PIMCO Investment Grade Corporate Bond Index Exchange-Traded Fund
CORP
$1.57B
$38.6K ﹤0.01%
399
+5
+1% +$489
EWG icon
1722
iShares MSCI Germany ETF
EWG
$1.6B
$38.6K ﹤0.01%
972
– –
ALB.PRA icon
1723
Albemarle Corp Depositary Shares
ALB.PRA
$2.41B
$38.4K ﹤0.01%
535
+235
+78% +$16.2K
SDS icon
1724
ProShares UltraShort S&P500
SDS
$420M
$37.6K ﹤0.01%
500
-100
-17% -$6.95K
NUMG icon
1725
Nuveen ESG Mid-Cap Growth ETF
NUMG
$349M
$37.5K ﹤0.01%
913
– –
67 68
69
70 71

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

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