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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
+2.39%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$26.5B
AUM Growth
-$769M
Cap. Flow
-$1.09B
Cap. Flow %
-4.11%
Top 10 Hldgs %
22.54%
Holding
1,941
New
123
Increased
715
Reduced
742
Closed
84

Top Buys

Rank Stock Value
1
KMX icon
CarMax
KMX
+$73M
2
OSH
Oak Street Health, Inc.
OSH
+$60.6M
3
IRTC icon
iRhythm Holdings
IRTC
+$51.2M
4
DXCM icon
DexCom
DXCM
+$39.4M
5
AON icon
Aon
AON
+$30.5M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$449M
2
VUG icon
Vanguard Morningstar Growth ETF
VUG
+$271M
3
AMZN icon
Amazon
AMZN
+$157M
4
MSFT icon
Microsoft
MSFT
+$83.3M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$78.4M

Sector Composition

Rank Sector Weight
1 Technology 25.67%
2 Healthcare 19.26%
3 Financials 11.68%
4 Consumer Discretionary 10.53%
5 Industrials 9.66%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SIRI icon
1076
SiriusXM
SIRI
$9.43B
$566K ﹤0.01%
9,294
+1,503
+19% +$91.6K
USD icon
1077
ProShares Ultra Semiconductors
USD
$2.99B
$560K ﹤0.01%
74,800
– –
THO icon
1078
Thor Industries
THO
$4.11B
$556K ﹤0.01%
4,127
+1,943
+89% +$236K
AVIR icon
1079
Atea Pharmaceuticals
AVIR
$406M
$555K ﹤0.01%
8,980
+3,650
+68% +$247K
IGIB icon
1080
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$18.6B
$555K ﹤0.01%
9,370
-2,183
-19% -$132K
IEUR icon
1081
iShares Core MSCI Europe ETF
IEUR
$9.15B
$554K ﹤0.01%
10,260
-33
-0.3% -$1.75K
ONB icon
1082
Old National Bancorp
ONB
$10.4B
$554K ﹤0.01%
28,642
-252
-0.9% -$4.67K
XT icon
1083
iShares Future Exponential Technologies ETF
XT
$4.01B
$553K ﹤0.01%
9,338
-333
-3% -$19.8K
POR icon
1084
Portland General Electric
POR
$5.92B
$550K ﹤0.01%
11,578
-939
-8% -$41K
EDIT icon
1085
Editas Medicine
EDIT
$432M
$548K ﹤0.01%
13,050
+1,350
+12% +$76.9K
GEN icon
1086
Gen Digital
GEN
$17.7B
$543K ﹤0.01%
25,556
-2,331
-8% -$48.9K
ASTRW
1087
DELISTED
Astra Space, Inc. Warrant
ASTRW
$543K ﹤0.01%
187,768
-23,564
-11% -$80.1K
VXUS icon
1088
Vanguard Total International Stock ETF
VXUS
$164B
$542K ﹤0.01%
8,652
+251
+3% +$15.7K
CNYA icon
1089
iShares MSCI China A ETF
CNYA
$207M
$541K ﹤0.01%
13,147
+2,435
+23% +$108K
VFH icon
1090
Vanguard Financials ETF
VFH
$14B
$541K ﹤0.01%
6,408
-135
-2% -$10.8K
VIGI icon
1091
Vanguard International Dividend Appreciation ETF
VIGI
$9.32B
$541K ﹤0.01%
6,531
– –
JHMM icon
1092
John Hancock Multifactor Mid Cap ETF
JHMM
$6.18B
$540K ﹤0.01%
10,994
+700
+7% +$33.3K
EMB icon
1093
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$15B
$539K ﹤0.01%
4,950
+756
+18% +$84.5K
JKHY icon
1094
Jack Henry & Associates
JKHY
$11.1B
$538K ﹤0.01%
3,543
+853
+32% +$130K
EPI icon
1095
WisdomTree India Earnings Fund ETF
EPI
$2.04B
$537K ﹤0.01%
17,047
-1,000
-6% -$31.1K
RIO icon
1096
Rio Tinto
RIO
$160B
$535K ﹤0.01%
+6,887
New +$565K
CHDN icon
1097
Churchill Downs
CHDN
$6.2B
$533K ﹤0.01%
4,690
+200
+4% +$22K
APTV icon
1098
Aptiv
APTV
$10.2B
$531K ﹤0.01%
3,850
+977
+34% +$142K
DSGR icon
1099
Distribution Solutions Group
DSGR
$1.61B
$530K ﹤0.01%
20,450
– –
UYG icon
1100
ProShares Ultra Financials
UYG
$863M
$530K ﹤0.01%
10,035
-3
-0% -$143
42 43
44
45 46

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William Blair & Company's Q1 2021 Portfolio in Review

As of Q1 2021, William Blair & Company held 1,941 positions worth $26.5B, down 2.8% from $27.3B the previous quarter. Its ten largest holdings account for 23% of the portfolio.

William Blair & Company withdrew a net $1.09B in Q1 2021, closing 84 positions and reducing 742 holdings. Its most notable exit was HMS Holdings Corp., an estimated $7.64M position sold in full.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 28% a quarter earlier, followed by Healthcare and Financials.

Against the trend, William Blair & Company opened a new position in Oak Street Health, Inc. worth $59.1M.

  • William Blair & Company's largest Q1 2021 buy was Oak Street Health, Inc.: 1,089,318 shares worth $59.1M.
  • William Blair & Company added most to CarMax in Q1 2021, an estimated $73M increase.
  • William Blair & Company's biggest Q1 2021 reduction was Apple, cutting an estimated $449M.
  • William Blair & Company fully exited HMS Holdings Corp. in Q1 2021, selling an estimated $7.64M.
  • William Blair & Company's ten largest holdings make up 23% of its $26.5B portfolio in Q1 2021.
  • William Blair & Company opened 123 new positions and closed 84 in Q1 2021.
  • William Blair & Company's portfolio value fell 2.8% quarter-over-quarter to $26.5B.

Based on William Blair & Company's 13F filing for Q1 2021, filed 13 May 2021.