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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
CQQQ icon
1626
Invesco China Technology ETF
CQQQ
$3B
$81.4K ﹤0.01%
1,769
+204
+13% +$10.7K
GMF icon
1627
State Street SPDR S&P Emerging Asia Pacific ETF
GMF
$412M
$81.3K ﹤0.01%
597
– –
IZRL icon
1628
ARK Israel Innovative Technology ETF
IZRL
$137M
$80.5K ﹤0.01%
2,990
– –
EWX icon
1629
State Street SPDR S&P Emerging Markets Small Cap ETF
EWX
$643M
$80.3K ﹤0.01%
1,215
– –
GEF.B icon
1630
Greif Class B
GEF.B
$4.04B
$80.2K ﹤0.01%
916
+516
+129% +$43.5K
EVH icon
1631
Evolent Health
EVH
$391M
$79.9K ﹤0.01%
35,039
-8,167
-19% -$25.9K
PBE icon
1632
Invesco Biotechnology & Genome ETF
PBE
$287M
$79.2K ﹤0.01%
1,000
– –
SANA icon
1633
Sana Biotechnology
SANA
$852M
$79K ﹤0.01%
+27,428
New +$108K
SILJ icon
1634
Amplify Junior Silver Miners ETF
SILJ
$3.09B
$78.8K ﹤0.01%
2,650
-100
-4% -$3.32K
RSPE icon
1635
Invesco ESG S&P 500 Equal Weight ETF
RSPE
$68.6M
$77.6K ﹤0.01%
2,636
– –
HYGV icon
1636
FlexShares High Yield Value-Scored Bond Index Fund
HYGV
$1.08B
$77.1K ﹤0.01%
1,924
-1,193
-38% -$48.5K
IMTB icon
1637
iShares Core 5-10 Year USD Bond ETF
IMTB
$276M
$76.5K ﹤0.01%
1,746
-124
-7% -$5.48K
REAX icon
1638
Real Brokerage
REAX
$355M
$75.2K ﹤0.01%
30,079
+79
+0.3% +$239
SLVP icon
1639
iShares MSCI Global Silver and Metals Miners ETF
SLVP
$756M
$75K ﹤0.01%
2,115
+115
+6% +$4.6K
SVV icon
1640
Savers
SVV
$1.54B
$74.7K ﹤0.01%
10,035
+35
+0.4% +$334
EDIV icon
1641
State Street SPDR S&P Emerging Markets Dividend ETF
EDIV
$1.21B
$74.4K ﹤0.01%
1,884
+1
+0.1% +$41
VCEB icon
1642
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
$74.3K ﹤0.01%
1,182
+8
+0.7% +$508
ALLO icon
1643
Allogene Therapeutics
ALLO
$583M
$73.3K ﹤0.01%
+30,040
New +$60.2K
WIT icon
1644
Wipro
WIT
$19.2B
$73.2K ﹤0.01%
34,528
+13,109
+61% +$31.9K
SRLN icon
1645
State Street Blackstone Senior Loan ETF
SRLN
$5.3B
$71.7K ﹤0.01%
+1,787
New +$72.6K
HAIN icon
1646
Hain Celestial
HAIN
$44.9M
$71.6K ﹤0.01%
102,540
-155,924
-60% -$145K
SJNK icon
1647
State Street SPDR Bloomberg Short Term High Yield Bond ETF
SJNK
$4.87B
$70.9K ﹤0.01%
2,840
-1,072
-27% -$27K
XT icon
1648
iShares Future Exponential Technologies ETF
XT
$3.72B
$70.8K ﹤0.01%
1,039
-8,413
-89% -$598K
RMCO icon
1649
Royalty Management
RMCO
$35M
$70.6K ﹤0.01%
23,782
-4,150
-15% -$15.9K
PETS icon
1650
PetMed Express
PETS
$42.5M
$69.3K ﹤0.01%
+30,400
New +$88.3K
64 65
66
67 68

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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.