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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
SMMD icon
1701
iShares Russell 2500 ETF
SMMD
$3.75B
$27K ﹤0.01%
+435
New +$26.9K
AAXJ icon
1702
iShares MSCI All Country Asia ex Japan ETF
AAXJ
$3.83B
$26K ﹤0.01%
284
– –
CSD icon
1703
Invesco S&P Spin-Off ETF
CSD
$232M
$26K ﹤0.01%
410
– –
QQQM icon
1704
Invesco NASDAQ 100 ETF
QQQM
$103B
$26K ﹤0.01%
+200
New +$26.3K
AOA icon
1705
iShares Core 80/20 Aggressive Allocation ETF
AOA
$3.28B
$25K ﹤0.01%
367
+100
+37% +$6.6K
AMPE
1706
DELISTED
Ampio Pharmaceuticals Inc.
AMPE
$25K ﹤0.01%
50
– –
TLH icon
1707
iShares 10-20 Year Treasury Bond ETF
TLH
$10.8B
$24K ﹤0.01%
168
– –
CZA icon
1708
Invesco Zacks Mid-Cap ETF
CZA
$192M
$23K ﹤0.01%
270
– –
GALT icon
1709
Galectin Therapeutics
GALT
$317M
$23K ﹤0.01%
10,756
– –
GEF.B icon
1710
Greif Class B
GEF.B
$4.24B
$23K ﹤0.01%
+400
New +$21K
VNM icon
1711
VanEck Vietnam ETF
VNM
$514M
$23K ﹤0.01%
1,283
-1,272
-50% -$22.7K
GPL
1712
DELISTED
Great Panther Mining Limited
GPL
$23K ﹤0.01%
+3,000
New +$26.1K
FVAL icon
1713
Fidelity Value Factor ETF
FVAL
$1.37B
$22K ﹤0.01%
500
– –
EWN icon
1714
iShares MSCI Netherlands ETF
EWN
$727M
$21K ﹤0.01%
450
– –
EWS icon
1715
iShares MSCI Singapore ETF
EWS
$1.16B
$21K ﹤0.01%
880
– –
EWZS icon
1716
iShares MSCI Brazil Small-Cap ETF
EWZS
$209M
$20K ﹤0.01%
1,300
– –
GII icon
1717
State Street SPDR S&P Global Infrastructure ETF
GII
$932M
$20K ﹤0.01%
+390
New +$19.7K
HYLS icon
1718
First Trust Exchange-Traded Fund IV First Trust Tactical High Yield ETF
HYLS
$1.64B
$20K ﹤0.01%
412
– –
ITB icon
1719
iShares US Home Construction ETF
ITB
$2.34B
$20K ﹤0.01%
302
-360
-54% -$22.2K
NFRA icon
1720
FlexShares STOXX Global Broad Infrastructure Index Fund
NFRA
$3.03B
$20K ﹤0.01%
349
– –
NGD
1721
DELISTED
New Gold Inc
NGD
$20K ﹤0.01%
13,000
-18,000
-58% -$32.5K
USEQ
1722
DELISTED
Invesco Russell 1000 Enhanced Equal Weight ETF
USEQ
$20K ﹤0.01%
580
– –
FHLC icon
1723
Fidelity MSCI Health Care Index ETF
FHLC
$3.42B
$19K ﹤0.01%
325
– –
SCHM icon
1724
Schwab US Mid-Cap ETF
SCHM
$15.2B
$19K ﹤0.01%
747
-144
-16% -$3.49K
TENX icon
1725
Tenax Therapeutics
TENX
$64.4M
$19K ﹤0.01%
6
– –
67 68
69
70 71

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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.