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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
IFGL icon
1651
iShares International Developed Real Estate ETF
IFGL
$82.2M
$44K ﹤0.01%
1,600
– –
COHR icon
1652
Coherent
COHR
$69.6B
$42K ﹤0.01%
618
-463
-43% -$38K
JEPI icon
1653
JPMorgan Equity Premium Income ETF
JEPI
$46.1B
$42K ﹤0.01%
+716
New +$40.2K
FM
1654
DELISTED
iShares Frontier and Select EM ETF
FM
$41K ﹤0.01%
1,397
-864
-38% -$25.4K
GSLC icon
1655
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$16B
$40K ﹤0.01%
507
+429
+550% +$33.3K
IHF icon
1656
iShares US Healthcare Providers ETF
IHF
$1.27B
$40K ﹤0.01%
790
+375
+90% +$18.3K
SSO icon
1657
ProShares Ultra S&P500
SSO
$8.39B
$40K ﹤0.01%
1,568
– –
IBDP
1658
DELISTED
iShares iBonds Dec 2024 Term Corporate ETF
IBDP
$40K ﹤0.01%
1,500
– –
EZM icon
1659
WisdomTree US MidCap Fund
EZM
$957M
$39K ﹤0.01%
765
-798
-51% -$38.3K
IQDG icon
1660
WisdomTree International Quality Dividend Growth Fund
IQDG
$731M
$39K ﹤0.01%
+1,062
New +$39.8K
IQLT icon
1661
iShares MSCI Intl Quality Factor ETF
IQLT
$14.3B
$39K ﹤0.01%
1,064
+25
+2% +$906
IVOV icon
1662
Vanguard S&P Mid-Cap 400 Value ETF
IVOV
$1.37B
$39K ﹤0.01%
502
– –
XTN icon
1663
State Street SPDR S&P Transportation ETF
XTN
$392M
$39K ﹤0.01%
450
– –
DVYE icon
1664
iShares Emerging Markets Dividend ETF
DVYE
$1.21B
$37K ﹤0.01%
934
+9
+1% +$348
FCVT icon
1665
First Trust SSI Strategic Convertible Securities ETF
FCVT
$103M
$37K ﹤0.01%
743
– –
ISCG icon
1666
iShares Morningstar Small-Cap Growth ETF
ISCG
$1.02B
$36K ﹤0.01%
720
– –
SCHE icon
1667
Schwab Emerging Markets Equity ETF
SCHE
$12.9B
$36K ﹤0.01%
1,121
-668
-37% -$21.8K
EWL icon
1668
iShares MSCI Switzerland ETF
EWL
$2.22B
$35K ﹤0.01%
785
– –
IGLB icon
1669
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.78B
$35K ﹤0.01%
524
– –
PPA icon
1670
Invesco Aerospace & Defense ETF
PPA
$8.74B
$35K ﹤0.01%
480
-100
-17% -$6.91K
TLPH icon
1671
Talphera
TLPH
$72.7M
$35K ﹤0.01%
+1,043
New +$41.4K
EDIV icon
1672
State Street SPDR S&P Emerging Markets Dividend ETF
EDIV
$1.22B
$34K ﹤0.01%
1,117
– –
EWQ icon
1673
iShares MSCI France ETF
EWQ
$333M
$34K ﹤0.01%
963
– –
DFJ icon
1674
WisdomTree Japan SmallCap Dividend Fund
DFJ
$402M
$33K ﹤0.01%
438
– –
FNDX icon
1675
Schwab Fundamental US Large Company Index ETF
FNDX
$27.4B
$33K ﹤0.01%
1,944
-1,809
-48% -$29.5K
65 66
67
68 69

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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.