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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
PSEP icon
551
Innovator US Equity Power Buffer ETF September
PSEP
$839M
$4.04M 0.01%
93,788
-10,308
-10% -$451K
IOO icon
552
iShares Global 100 ETF
IOO
$8.62B
$4.01M 0.01%
33,152
+31,027
+1,460% +$3.91M
SITE icon
553
SiteOne Landscape Supply
SITE
$4.16B
$4.01M 0.01%
30,111
-5,275
-15% -$745K
TER icon
554
Teradyne
TER
$50B
$4M 0.01%
13,484
+175
+1% +$48.8K
TEM
555
Tempus AI
TEM
$7.48B
$3.99M 0.01%
88,321
+7,124
+9% +$405K
SNOW icon
556
Snowflake
SNOW
$98.1B
$3.99M 0.01%
26,446
-8,971
-25% -$1.66M
FIVE icon
557
Five Below
FIVE
$11.6B
$3.98M 0.01%
17,412
-362
-2% -$75.7K
GIS icon
558
General Mills
GIS
$20.2B
$3.97M 0.01%
106,753
-4,832
-4% -$210K
MUB icon
559
iShares National Muni Bond ETF
MUB
$45.2B
$3.92M 0.01%
36,931
-742
-2% -$79.8K
SUB icon
560
iShares Short-Term National Muni Bond ETF
SUB
$11.3B
$3.92M 0.01%
36,770
+2,524
+7% +$270K
CELH icon
561
Celsius Holdings
CELH
$7.38B
$3.89M 0.01%
109,531
+73,309
+202% +$3.48M
OPRX icon
562
OptimizeRx
OPRX
$120M
$3.86M 0.01%
614,992
+32,407
+6% +$301K
BBJP icon
563
JPMorgan BetaBuilders Japan ETF
BBJP
$17B
$3.86M 0.01%
55,989
+2,538
+5% +$179K
PGX icon
564
Invesco Preferred ETF
PGX
$3.79B
$3.85M 0.01%
354,246
+5,269
+2% +$59.6K
SPDW icon
565
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$39.3B
$3.85M 0.01%
84,409
+9,902
+13% +$465K
CMCSA icon
566
Comcast
CMCSA
$87.3B
$3.82M 0.01%
133,103
-16,726
-11% -$501K
BIDU icon
567
Baidu
BIDU
$35.7B
$3.79M 0.01%
34,008
-205
-0.6% -$27.8K
PJUN icon
568
Innovator US Equity Power Buffer ETF June
PJUN
$945M
$3.78M 0.01%
90,463
-6,444
-7% -$271K
KMX icon
569
CarMax
KMX
$8.39B
$3.77M 0.01%
90,691
-8,560
-9% -$375K
BR icon
570
Broadridge
BR
$18.4B
$3.75M 0.01%
23,049
-8,099
-26% -$1.54M
HCA icon
571
HCA Healthcare
HCA
$90.6B
$3.72M 0.01%
7,852
-230
-3% -$116K
CRCL
572
Circle Internet Group
CRCL
$15.3B
$3.71M 0.01%
38,930
+16,265
+72% +$1.38M
KAUG
573
Innovator U.S. Small Cap Power Buffer ETF - August
KAUG
$59M
$3.7M 0.01%
137,998
-1,485
-1% -$40.1K
VTEB icon
574
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.2B
$3.69M 0.01%
74,042
-7,614
-9% -$384K
WMB icon
575
Williams Companies
WMB
$85.8B
$3.66M 0.01%
50,333
-25,441
-34% -$1.76M
21 22
23
24 25

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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.