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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
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 Miscellaneous 17.51%
3 Industrials 14.2%
4 Financials 12.26%
5 Healthcare 10.59%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ELD icon
1826
WisdomTree Emerging Markets Local Debt Fund
ELD
$138M
$7.94K ﹤0.01%
286
+2
+0.7% +$59
PDN icon
1827
Invesco FTSE RAFI Developed Markets ex-US Small-Mid ETF
PDN
$353M
$7.63K ﹤0.01%
176
– –
EEMS icon
1828
iShares MSCI Emerging Markets Small-Cap ETF
EEMS
$387M
$7.61K ﹤0.01%
110
– –
XHS icon
1829
State Street SPDR S&P Health Care Services ETF
XHS
$221M
$7.51K ﹤0.01%
75
– –
AIA icon
1830
iShares Asia 50 ETF
AIA
$5.03B
$7.01K ﹤0.01%
66
– –
FSTA icon
1831
Fidelity MSCI Consumer Staples Index ETF
FSTA
$1.37B
$6.96K ﹤0.01%
133
-65
-33% -$3.47K
DFE icon
1832
WisdomTree Europe SmallCap Dividend Fund
DFE
$165M
$6.82K ﹤0.01%
95
– –
SQQQ icon
1833
ProShares UltraPro Short QQQ
SQQQ
$1.88B
$6.44K ﹤0.01%
80
– –
FXG icon
1834
First Trust Consumer Staples AlphaDEX Fund
FXG
$205M
$6.37K ﹤0.01%
+100
New +$6.51K
PTLC icon
1835
Pacer Trendpilot US Large Cap ETF
PTLC
$3.36B
$6.29K ﹤0.01%
+120
New +$6.65K
SPIP icon
1836
State Street SPDR Portfolio TIPS ETF
SPIP
$1,000M
$6.29K ﹤0.01%
242
– –
PJP icon
1837
Invesco Pharmaceuticals ETF
PJP
$555M
$6.23K ﹤0.01%
60
– –
BF.A icon
1838
Brown-Forman Class A
BF.A
$12.2B
$6K ﹤0.01%
224
+60
+37% +$1.63K
KCE icon
1839
State Street SPDR S&P Capital Markets ETF
KCE
$514M
$5.78K ﹤0.01%
42
-215
-84% -$31.7K
LEGR icon
1840
First Trust Indxx Innovative Transaction & Process ETF
LEGR
$129M
$5.78K ﹤0.01%
100
– –
RSPS icon
1841
Invesco S&P 500 Equal Weight Consumer Staples ETF
RSPS
$432M
$5.16K ﹤0.01%
175
– –
AIEQ icon
1842
Amplify AI Powered Equity ETF
AIEQ
$119M
$5.01K ﹤0.01%
116
+82
+241% +$3.7K
ISCV icon
1843
iShares Morningstar Small-Cap Value ETF
ISCV
$663M
$5K ﹤0.01%
72
+37
+106% +$2.65K
EINC icon
1844
VanEck Energy Income ETF
EINC
$81.6M
$4.48K ﹤0.01%
38
– –
EWQ icon
1845
iShares MSCI France ETF
EWQ
$351M
$4.38K ﹤0.01%
101
– –
FXU icon
1846
First Trust Utilities AlphaDEX Fund
FXU
$732M
$4.31K ﹤0.01%
87
– –
PRN icon
1847
Invesco Dorsey Wright Industrials Momentum ETF
PRN
$373M
$4.28K ﹤0.01%
22
– –
PSL icon
1848
Invesco Dorsey Wright Consumer Staples Momentum ETF
PSL
$78.6M
$4.02K ﹤0.01%
37
– –
EMC icon
1849
Global X Emerging Markets Great Consumer ETF
EMC
$58.9M
$3.89K ﹤0.01%
126
– –
IMMP
1850
Immutep
IMMP
$38.8M
$3.86K ﹤0.01%
11,000
-7,569
-41% -$17.3K
72 73
74
75 76

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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 Miscellaneous and Industrials.

  • 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.