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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
STKL
1601
DELISTED
SunOpta
STKL
$92.9K ﹤0.01%
14,337
-1,412,658
-99% -$7.99M
AREC icon
1602
American Resources Corp
AREC
$179M
$92.6K ﹤0.01%
38,275
+1,000
+3% +$3.18K
SPT icon
1603
Sprout Social
SPT
$531M
$92.3K ﹤0.01%
16,196
-28,899
-64% -$223K
RXRX icon
1604
Recursion Pharmaceuticals
RXRX
$1.59B
$92.3K ﹤0.01%
30,061
-43,939
-59% -$170K
CLF icon
1605
Cleveland-Cliffs
CLF
$6.35B
$91.9K ﹤0.01%
10,872
+83
+0.8% +$950
PIO icon
1606
Invesco Global Water ETF
PIO
$270M
$91.7K ﹤0.01%
2,113
– –
DPRO
1607
Draganfly
DPRO
$144M
$90.8K ﹤0.01%
+18,500
New +$137K
BELFA icon
1608
Bel Fuse Inc Class A
BELFA
$2.86B
$90.1K ﹤0.01%
500
– –
IEO icon
1609
iShares US Oil & Gas Exploration & Production ETF
IEO
$564M
$88.9K ﹤0.01%
712
-1
-0.1% -$106
RWR icon
1610
State Street SPDR Dow Jones REIT ETF
RWR
$1.9B
$88.1K ﹤0.01%
873
– –
QCLN icon
1611
First Trust NASDAQ Clean Edge Green Energy Index Fund
QCLN
$574M
$87.4K ﹤0.01%
1,881
-50
-3% -$2.44K
PCY icon
1612
Invesco Emerging Markets Sovereign Debt ETF
PCY
$1.39B
$87.3K ﹤0.01%
4,177
-1,501
-26% -$32.3K
ALT icon
1613
Altimmune
ALT
$576M
$86.9K ﹤0.01%
28,223
-28,211
-50% -$120K
SPRY icon
1614
ARS Pharmaceuticals
SPRY
$563M
$86.9K ﹤0.01%
10,825
-775
-7% -$7.43K
FTA icon
1615
First Trust Large Cap Value AlphaDEX Fund
FTA
$1.41B
$85.7K ﹤0.01%
928
– –
GSY icon
1616
Invesco Ultra Short Duration ETF
GSY
$3.86B
$85.7K ﹤0.01%
1,710
+2
+0.1% +$101
USHY icon
1617
iShares Broad USD High Yield Corporate Bond ETF
USHY
$29.2B
$85.2K ﹤0.01%
2,314
+19
+0.8% +$708
FPX icon
1618
First Trust US Equity Opportunities ETF
FPX
$1.44B
$84.6K ﹤0.01%
533
– –
IAT icon
1619
iShares US Regional Banks ETF
IAT
$680M
$84.4K ﹤0.01%
1,567
-4,557
-74% -$259K
BMRN icon
1620
BioMarin Pharmaceuticals
BMRN
$12B
$83.5K ﹤0.01%
+1,479
New +$86.2K
PRTH icon
1621
Priority Technology Holdings
PRTH
$570M
$82.4K ﹤0.01%
17,453
-8
-0% -$44
CLYM
1622
Climb Bio
CLYM
$695M
$82.2K ﹤0.01%
12,000
+1,000
+9% +$5.77K
OIH icon
1623
VanEck Oil Services ETF
OIH
$1.98B
$82.1K ﹤0.01%
203
+183
+915% +$67K
TLRY icon
1624
Tilray
TLRY
$478M
$81.8K ﹤0.01%
12,648
-11,317
-47% -$88.2K
PFFA icon
1625
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.43B
$81.4K ﹤0.01%
+4,000
New +$85.9K
63 64
65
66 67

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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.