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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
RSPM icon
1676
Invesco S&P 500 Equal Weight Materials ETF
RSPM
$190M
$58.4K ﹤0.01%
1,510
– –
NAUT icon
1677
Nautilus Biotechnolgy
NAUT
$152M
$58.2K ﹤0.01%
+15,000
New +$36.9K
ISCG icon
1678
iShares Morningstar Small-Cap Growth ETF
ISCG
$976M
$58.2K ﹤0.01%
1,062
– –
ITEQ icon
1679
Amplify BlueStar Israel Technology ETF
ITEQ
$113M
$57.5K ﹤0.01%
1,000
– –
TBF icon
1680
ProShares Short 20+ Year Treasury ETF
TBF
$85.7M
$56.9K ﹤0.01%
2,350
– –
IRD
1681
Opus Genetics
IRD
$282M
$56.7K ﹤0.01%
12,466
-15,000
-55% -$51.9K
IWC icon
1682
iShares Micro-Cap ETF
IWC
$1.45B
$56.7K ﹤0.01%
355
– –
DVYE icon
1683
iShares Emerging Markets Dividend ETF
DVYE
$1.2B
$55.9K ﹤0.01%
1,625
– –
IXG icon
1684
iShares Global Financials ETF
IXG
$679M
$55.6K ﹤0.01%
488
– –
IVA
1685
Inventiva
IVA
$1.1B
$55.5K ﹤0.01%
+10,000
New +$61K
FBT icon
1686
First Trust NYSE Arca Biotechnology Index Fund
FBT
$2.85B
$55.2K ﹤0.01%
275
-43
-14% -$8.89K
NURE icon
1687
Nuveen Short-Term REIT ETF
NURE
$36.4M
$54.4K ﹤0.01%
2,000
– –
EQAL icon
1688
Invesco Russell 1000 Equal Weight ETF
EQAL
$822M
$54.1K ﹤0.01%
982
– –
AVIR icon
1689
Atea Pharmaceuticals
AVIR
$361M
$54K ﹤0.01%
+10,037
New +$46.1K
FDD icon
1690
First Trust STOXX European Select Dividend Income Fund
FDD
$865M
$53.4K ﹤0.01%
3,000
– –
BA.PRA
1691
Boeing Co 6.00% Series A Preferred Stock
BA.PRA
$7.89B
$53.4K ﹤0.01%
823
+261
+46% +$19K
ILF icon
1692
iShares Latin America 40 ETF
ILF
$3.79B
$53.3K ﹤0.01%
+1,500
New +$51.9K
WOMN icon
1693
Impact Shares Womens Empowerment ETF Trading
WOMN
$56.9M
$51.9K ﹤0.01%
1,311
-10
-0.8% -$411
FV icon
1694
First Trust Dorsey Wright Focus 5 ETF
FV
$3.62B
$51.9K ﹤0.01%
858
– –
JHML icon
1695
John Hancock Multifactor Large Cap ETF
JHML
$1.16B
$50.9K ﹤0.01%
650
– –
BATRK icon
1696
Atlanta Braves Holdings Series B
BATRK
$3.27B
$49.7K ﹤0.01%
+1,163
New +$48.3K
CDXS icon
1697
Codexis
CDXS
$161M
$48.9K ﹤0.01%
30,018
-372
-1% -$530
FNCL icon
1698
Fidelity MSCI Financials Index ETF
FNCL
$2.4B
$47.5K ﹤0.01%
677
-75
-10% -$5.57K
SMOG icon
1699
VanEck Low Carbon Energy ETF
SMOG
$126M
$47.1K ﹤0.01%
339
– –
RFG icon
1700
Invesco S&P MidCap 400 Pure Growth ETF
RFG
$339M
$47.1K ﹤0.01%
859
– –
66 67
68
69 70

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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.